/* ================================================================
   作文批改系统 · Design System
   版本: 2.0 | 日期: 2025-06-25
   设计原则: 暖调学术 · 语义清晰 · WCAG AA · 8px 基准间距
   ================================================================ */

/* ─── Design Tokens ─────────────────────────────────────────── */
:root {
  /* ═══ 品牌色（教育·学术场景） ═══ */
  --color-primary: #1a56db;
  --color-primary-hover: #1e40af;
  --color-primary-light: #eff6ff;
  --color-primary-border: #bfdbfe;

  --color-success: #059669;
  --color-success-hover: #047857;
  --color-success-light: #ecfdf5;
  --color-success-border: #a7f3d0;

  --color-warning: #d97706;
  --color-warning-hover: #b45309;
  --color-warning-light: #fffbeb;
  --color-warning-border: #fde68a;

  --color-danger: #dc2626;
  --color-danger-hover: #b91c1c;
  --color-danger-light: #fef2f2;
  --color-danger-border: #fecaca;

  /* 中性色阶（Slate） */
  --color-neutral-50: #f8fafc;
  --color-neutral-100: #f1f5f9;
  --color-neutral-200: #e2e8f0;
  --color-neutral-300: #cbd5e1;
  --color-neutral-400: #94a3b8;
  --color-neutral-500: #64748b;
  --color-neutral-600: #475569;
  --color-neutral-700: #334155;
  --color-neutral-800: #1e293b;
  --color-neutral-900: #0f172a;

  /* ═══ 页面底色 ═══ */
  --bg-page: #faf8f5;

  /* ═══ 排版 ═══ */
  --font-sans: "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, sans-serif;
  --font-mono: "Cascadia Code", "Fira Code", "JetBrains Mono", Consolas, monospace;

  --text-xs: 0.75rem;      /* 12px */
  --text-sm: 0.875rem;     /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg: 1.125rem;     /* 18px */
  --text-xl: 1.25rem;      /* 20px */
  --text-2xl: 1.5rem;      /* 24px */
  --text-3xl: 1.875rem;    /* 30px */

  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;

  /* ═══ 间距（8px 基准） ═══ */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */

  /* ═══ 圆角 ═══ */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.25rem;
  --radius-full: 9999px;

  /* ═══ 阴影 ═══ */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.06), 0 4px 6px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.07), 0 8px 10px rgba(0, 0, 0, 0.04);

  /* ═══ 过渡 ═══ */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── Reset & Base ──────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-page);
  margin: 0;
  color: var(--color-neutral-800);
  line-height: var(--leading-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ─── Layout ────────────────────────────────────────────────── */
.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6);
}

/* 屏幕阅读器专用（视觉隐藏但可被读屏软件读取） */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.row {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  align-items: flex-start;
}

.row--center {
  align-items: center;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.form-group {
  margin-bottom: var(--space-4);
}

.form-group label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-neutral-700);
}

.form-group label .optional {
  font-weight: var(--font-normal);
  color: var(--color-neutral-400);
  font-size: var(--text-xs);
  margin-left: var(--space-1);
}

.required-star {
  color: var(--color-danger);
  font-weight: bold;
  margin-left: 2px;
}

/* ─── Semantic HTML ──────────────────────────────────────────── */
nav.nav {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}

nav.nav .nav-item {
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  text-decoration: none;
  background: var(--color-neutral-100);
  color: var(--color-neutral-600);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

nav.nav .nav-item:hover {
  background: var(--color-neutral-200);
  color: var(--color-neutral-800);
}

nav.nav .nav-item.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

nav.nav .nav-item--primary {
  background: var(--color-primary);
  color: #fff;
}

nav.nav .nav-item--primary:hover {
  background: var(--color-primary-hover);
}

/* ─── Typography ─────────────────────────────────────────────── */
h1 {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-neutral-900);
  margin: 0 0 var(--space-2);
  line-height: var(--leading-tight);
}

h2 {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--color-neutral-800);
  margin: 0 0 var(--space-3);
  line-height: var(--leading-tight);
}

h3 {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-neutral-700);
  margin: 0 0 var(--space-2);
  line-height: var(--leading-tight);
}

.muted {
  color: var(--color-neutral-500);
}

.small {
  font-size: var(--text-sm);
}

.text-xs {
  font-size: var(--text-xs);
}

/* ─── Card ───────────────────────────────────────────────────── */
.card {
  background: #fff;
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-neutral-200);
  transition: box-shadow var(--transition-normal);
}

.card--highlight {
  border-left: 4px solid var(--color-primary);
}

.card--success {
  border-left: 4px solid var(--color-success);
}

.paper-hint {
  margin: var(--space-3) 0;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  line-height: 1.6;
}
.paper-hint--warn {
  border: 1px solid #f59e0b;
  border-left: 4px solid #d97706;
  background: #fffbeb;
  color: #92400e;
}

.card--warning {
  border-left: 4px solid var(--color-warning);
}

.card--danger {
  border-left: 4px solid var(--color-danger);
}

/* ─── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  line-height: var(--leading-tight);
  transition: all var(--transition-fast);
  user-select: none;
  white-space: nowrap;
  min-height: 40px;
}

/* 语义变体 */
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-success {
  background: var(--color-success);
  color: #fff;
  border-color: var(--color-success);
}

.btn-success:hover {
  background: var(--color-success-hover);
  border-color: var(--color-success-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-warning {
  background: var(--color-warning);
  color: #fff;
  border-color: var(--color-warning);
}

.btn-warning:hover {
  background: var(--color-warning-hover);
  border-color: var(--color-warning-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-danger {
  background: var(--color-danger);
  color: #fff;
  border-color: var(--color-danger);
}

.btn-danger:hover {
  background: var(--color-danger-hover);
  border-color: var(--color-danger-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-neutral {
  background: var(--color-neutral-100);
  color: var(--color-neutral-700);
  border-color: var(--color-neutral-300);
}

.btn-neutral:hover {
  background: var(--color-neutral-200);
  color: var(--color-neutral-800);
  border-color: var(--color-neutral-400);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: transparent;
}

.btn-ghost:hover {
  background: var(--color-primary-light);
}

/* 尺寸变体 */
.btn-sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  min-height: 32px;
}

.btn-lg {
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  min-height: 48px;
}

/* 状态 */
.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(26, 86, 219, 0.15);
}

.btn:active:not(:disabled) {
  transform: scale(0.97);
}

.btn:disabled,
.btn.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
  transform: none;
}

/* 加载态 */
.btn--loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
}

.btn--loading::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: btn-spin 0.6s linear infinite;
}

@keyframes btn-spin {
  to { transform: rotate(360deg); }
}

/* ─── Form Elements ──────────────────────────────────────────── */
input[type="text"],
input[type="file"],
input[type="number"],
input[type="email"],
textarea,
select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-neutral-300);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-neutral-800);
  background: #fff;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input[type="text"]:hover,
textarea:hover,
select:hover {
  border-color: var(--color-neutral-400);
}

input[type="text"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.12);
}

input::placeholder,
textarea::placeholder {
  color: var(--color-neutral-400);
}

input[type="checkbox"] {
  width: auto;
  transform: scale(1.15);
  margin-right: var(--space-2);
  accent-color: var(--color-primary);
}

input[type="file"] {
  padding: var(--space-2);
  font-size: var(--text-sm);
}

textarea {
  min-height: 160px;
  line-height: var(--leading-relaxed);
  resize: vertical;
}

.textarea-large {
  min-height: 320px;
}

.textarea-mid {
  min-height: 200px;
}

/* ─── Table ──────────────────────────────────────────────────── */
.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

thead {
  position: sticky;
  top: 0;
  z-index: 1;
}

th {
  background: var(--color-neutral-50);
  color: var(--color-neutral-600);
  font-weight: var(--font-semibold);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-3) var(--space-4);
  border-bottom: 2px solid var(--color-neutral-200);
  text-align: left;
  white-space: nowrap;
}

td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-neutral-100);
  color: var(--color-neutral-700);
}

tbody tr:hover {
  background: var(--color-primary-light);
}

tbody tr:nth-child(even) {
  background: var(--color-neutral-50);
}

tbody tr:nth-child(even):hover {
  background: var(--color-primary-light);
}

/* ─── Badge ──────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  white-space: nowrap;
}

.badge-pending {
  background: var(--color-warning-light);
  color: var(--color-warning);
  border: 1px solid var(--color-warning-border);
}

.badge-done {
  background: var(--color-success-light);
  color: var(--color-success);
  border: 1px solid var(--color-success-border);
}

.badge-progress {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border: 1px solid var(--color-primary-border);
}

.badge-progress--active {
  align-items: center;
  box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.22);
  animation: progress-badge-pulse 1.6s infinite ease-out;
}

.badge-error {
  background: var(--color-danger-light);
  color: var(--color-danger);
  border: 1px solid var(--color-danger-border);
}

.badge-neutral {
  background: var(--color-neutral-100);
  color: var(--color-neutral-600);
  border: 1px solid var(--color-neutral-200);
}

/* ─── Pill ───────────────────────────────────────────────────── */
.pill {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  margin-left: var(--space-2);
  border: 1px solid var(--color-primary-border);
}

.pill--success {
  background: var(--color-success-light);
  color: var(--color-success);
  border-color: var(--color-success-border);
}

.pill--warning {
  background: var(--color-warning-light);
  color: var(--color-warning);
  border-color: var(--color-warning-border);
}

/* ─── Tag Flow（缺交名单等） ────────────────────────────────── */
.tag-flow {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  background: var(--color-neutral-100);
  color: var(--color-neutral-600);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  border: 1px solid var(--color-neutral-200);
}

.tag--danger {
  background: var(--color-danger-light);
  color: var(--color-danger);
  border-color: var(--color-danger-border);
}

/* ─── Checklist (班级选择网格) ────────────────────────────────── */
.checklist {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-3);
}

.checkitem {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  background: var(--color-neutral-50);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: var(--text-sm);
}

.checkitem:hover {
  border-color: var(--color-primary-border);
  background: var(--color-primary-light);
}

.checkitem:has(input:checked) {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

/* ─── Pre / Code ─────────────────────────────────────────────── */
pre {
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  background: var(--color-neutral-50);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-neutral-200);
  color: var(--color-neutral-700);
  max-height: 600px;
  overflow-y: auto;
}

/* ─── Details / Summary ──────────────────────────────────────── */
details {
  background: var(--color-neutral-50);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  margin: var(--space-3) 0;
}

details summary {
  cursor: pointer;
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
  color: var(--color-neutral-600);
  user-select: none;
}

details summary:hover {
  color: var(--color-primary);
}

details[open] {
  background: var(--color-primary-light);
  border-color: var(--color-primary-border);
}

details[open] summary {
  margin-bottom: var(--space-3);
}

/* ─── Toast / Flash ──────────────────────────────────────────── */
.toast-container {
  position: fixed;
  top: var(--space-6);
  right: var(--space-6);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: #fff;
  box-shadow: var(--shadow-lg);
  animation: toast-in 0.35s var(--transition-normal) both;
  max-width: 420px;
}

.toast--success { background: var(--color-success); }
.toast--error   { background: var(--color-danger); }
.toast--info    { background: var(--color-primary); }
.toast--warning { background: var(--color-warning); }

.toast--out {
  animation: toast-out 0.25s ease-in forwards;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes toast-out {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(100%);
  }
}

/* ─── Empty State ────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-6);
}

.empty-state__icon {
  font-size: 3.5rem;
  margin-bottom: var(--space-4);
  opacity: 0.6;
}

.empty-state__title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-neutral-700);
  margin-bottom: var(--space-2);
}

.empty-state__desc {
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
  margin-bottom: var(--space-6);
}

/* ─── Separator ──────────────────────────────────────────────── */
hr {
  border: none;
  border-top: 1px solid var(--color-neutral-200);
  margin: var(--space-6) 0;
}

/* ─── Stats Row ──────────────────────────────────────────────── */
.stats-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin: var(--space-4) 0;
}

.stat-item {
  flex: 1;
  min-width: 100px;
  padding: var(--space-4);
  background: var(--color-neutral-50);
  border-radius: var(--radius-md);
  text-align: center;
  border: 1px solid var(--color-neutral-200);
}

.stat-item__value {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-primary);
  line-height: var(--leading-tight);
}

.stat-item__label {
  font-size: var(--text-xs);
  color: var(--color-neutral-500);
  margin-top: var(--space-1);
}

/* ═══ 响应式 ═══════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  .wrap {
    padding: var(--space-4) var(--space-4);
  }
}

@media (max-width: 800px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .stats-row {
    gap: var(--space-2);
  }

  .stat-item {
    padding: var(--space-3);
  }

  .stat-item__value {
    font-size: var(--text-xl);
  }
}

@media (max-width: 640px) {
  .wrap {
    padding: var(--space-3);
  }

  .card {
    padding: var(--space-4);
    border-radius: var(--radius-lg);
  }

  nav.nav {
    flex-direction: column;
  }

  nav.nav .nav-item {
    width: 100%;
    text-align: center;
  }

  .toast-container {
    left: var(--space-3);
    right: var(--space-3);
    top: var(--space-3);
  }

  .toast {
    max-width: 100%;
  }

  table {
    font-size: var(--text-xs);
  }

  th, td {
    padding: var(--space-2) var(--space-3);
  }

  .checklist {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 400px) {
  .checklist {
    grid-template-columns: 1fr;
  }
}

/* ═══ 暗色主题 ═════════════════════════════════════════════════ */
[data-theme="dark"] {
  --bg-page: #0f172a;
  --color-neutral-50: #1e293b;
  --color-neutral-100: #1e293b;
  --color-neutral-200: #334155;
  --color-neutral-300: #475569;
  --color-neutral-400: #64748b;
  --color-neutral-500: #94a3b8;
  --color-neutral-600: #cbd5e1;
  --color-neutral-700: #e2e8f0;
  --color-neutral-800: #f1f5f9;
  --color-neutral-900: #f8fafc;

  --color-primary: #3b82f6;
  --color-primary-hover: #60a5fa;
  --color-primary-light: #1e3a5f;
  --color-primary-border: #1e4d8c;

  --color-success: #10b981;
  --color-success-light: #064e3b;
  --color-success-border: #065f46;

  --color-warning: #f59e0b;
  --color-warning-light: #451a03;
  --color-warning-border: #78350f;

  --color-danger: #ef4444;
  --color-danger-light: #450a0a;
  --color-danger-border: #7f1d1d;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5);
}

[data-theme="dark"] body {
  color: var(--color-neutral-800);
}

[data-theme="dark"] .card {
  background: #1e293b;
  border-color: var(--color-neutral-200);
}

[data-theme="dark"] .card--highlight {
  border-left-color: var(--color-primary);
}

[data-theme="dark"] .card--success {
  border-left-color: var(--color-success);
}

[data-theme="dark"] input[type="text"],
[data-theme="dark"] input[type="file"],
[data-theme="dark"] input[type="number"],
[data-theme="dark"] input[type="email"],
[data-theme="dark"] textarea,
[data-theme="dark"] select {
  background: #0f172a;
  color: var(--color-neutral-800);
  border-color: var(--color-neutral-300);
}

[data-theme="dark"] pre {
  background: #0f172a;
  color: var(--color-neutral-700);
}

[data-theme="dark"] .checkitem {
  background: var(--color-neutral-100);
}

[data-theme="dark"] .tag {
  background: var(--color-neutral-100);
  color: var(--color-neutral-600);
  border-color: var(--color-neutral-200);
}

[data-theme="dark"] .stat-item {
  background: var(--color-neutral-100);
}

[data-theme="dark"] .progress-card {
  background: var(--color-primary-light);
  border-color: var(--color-primary-border);
}

[data-theme="dark"] .progress-bar {
  background: var(--color-neutral-300);
}

[data-theme="dark"] .search-box__input {
  background: #0f172a;
  color: var(--color-neutral-800);
  border-color: var(--color-neutral-300);
}

[data-theme="dark"] thead th {
  background: #1a2740;
}

/* ─── Theme Toggle ───────────────────────────────────────────── */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
  cursor: pointer;
  font-size: 1.1rem;
  transition: all var(--transition-fast);
  color: var(--color-neutral-600);
  margin-left: auto;
}

.theme-toggle:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary-border);
  color: var(--color-primary);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ═══ 减动偏好 ═════════════════════════════════════════════════ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ─── Progress Bar ────────────────────────────────────────────── */
.progress-card {
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  margin-bottom: var(--space-4);
  animation: fadeIn 0.3s ease;
}

.progress-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-3);
}

.progress-card__title {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-primary);
}

.progress-card__stats {
  font-size: var(--text-xs);
  color: var(--color-neutral-500);
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--color-neutral-200);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.progress-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), #60a5fa);
  border-radius: var(--radius-full);
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.progress-bar__fill::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255,255,255,0.3),
    transparent
  );
  animation: shimmer 1.5s ease-in-out infinite;
}

@keyframes shimmer {
  0%   { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── Table Sort ─────────────────────────────────────────────── */
th.sortable {
  cursor: pointer;
  user-select: none;
  position: relative;
  transition: background var(--transition-fast);
}

th.sortable:hover {
  background: var(--color-neutral-200);
  color: var(--color-neutral-800);
}

th.sortable::after {
  content: " ↕";
  font-size: 0.7rem;
  opacity: 0.35;
  margin-left: var(--space-1);
  transition: opacity var(--transition-fast);
}

th.sortable:hover::after {
  opacity: 0.6;
}

th.sort-asc::after {
  content: " ↑";
  opacity: 1;
}

th.sort-desc::after {
  content: " ↓";
  opacity: 1;
}

/* ─── Inline Search ──────────────────────────────────────────── */
.search-box {
  position: relative;
  max-width: 320px;
  margin-bottom: var(--space-3);
}

.search-box__input {
  width: 100%;
  padding: var(--space-2) var(--space-4) var(--space-2) var(--space-8);
  border: 1px solid var(--color-neutral-300);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-family: var(--font-sans);
  background: #fff;
  color: var(--color-neutral-800);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box__input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.12);
}

.search-box__input::placeholder {
  color: var(--color-neutral-400);
}

.search-box__icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  font-size: var(--text-sm);
  color: var(--color-neutral-400);
  pointer-events: none;
}

.search-results {
  font-size: var(--text-xs);
  color: var(--color-neutral-500);
  margin-bottom: var(--space-2);
}

/* ═══ 打印样式 ═════════════════════════════════════════════════ */
@media print {
  body {
    background: #fff;
  }

  nav.nav,
  .toast-container,
  .btn {
    display: none;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }

  .wrap {
    max-width: 100%;
    padding: 0;
  }
}

/* Student Submit Flow */
.copy-link {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-3);
  align-items: center;
}

.copy-link input,
.submit-card input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-neutral-300);
  border-radius: var(--radius-md);
  background: #fff;
  color: var(--color-neutral-800);
  font-size: var(--text-base);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.copy-link input:focus,
.submit-card input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.12);
}

.submit-shell {
  max-width: 760px;
  margin: 0 auto;
}

.submit-shell--work {
  max-width: 1180px;
}

.submit-shell--work .submit-card {
  min-height: calc(100vh - 48px);
}

.submit-shell--work .textarea-large {
  min-height: 52vh;
}

.submit-card {
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-lg);
}

.submit-card--success {
  border-left: 4px solid var(--color-success);
}

/* 失败页必须是「红」而不是「绿」：绿色左边框会被一眼读成「提交成功了」，
   这正是本页最不该出现的误导。 */
.submit-card--failed {
  border-left: 4px solid var(--color-danger);
}

.submit-eyebrow {
  margin: 0 0 var(--space-2);
  color: var(--color-primary);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
}

.prompt-preview {
  max-height: 180px;
  overflow: auto;
  padding: var(--space-4);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
  color: var(--color-neutral-700);
  white-space: pre-wrap;
  line-height: var(--leading-relaxed);
}

.submit-prompt-compact .prompt-preview {
  max-height: 96px;
  padding: var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.55;
}

.required-star {
  margin-left: 3px;
  color: var(--color-danger);
  font-weight: var(--font-bold);
}

.submit-work-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.submit-work-head h1 {
  margin: 0;
}

.student-submit-form [hidden] {
  display: none !important;
}

.submit-choice-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.submit-choice {
  display: grid;
  gap: var(--space-1);
  min-height: 86px;
  padding: var(--space-4);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  background: #fff;
  color: var(--color-neutral-700);
  text-align: left;
  cursor: pointer;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.submit-choice:hover,
.submit-choice.is-active {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.08);
}

.submit-choice strong {
  color: var(--color-neutral-900);
  font-size: var(--text-base);
}

.submit-choice span {
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
  line-height: 1.45;
}

.submit-methods {
  margin-bottom: var(--space-4);
}

.submit-method {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  background: var(--color-neutral-50);
}

.submit-method label {
  margin: 0;
  color: var(--color-neutral-800);
  font-weight: var(--font-semibold);
}

.paper-dropzone {
  position: relative;
  display: grid;
  min-height: 96px;
  place-items: center;
  padding: var(--space-4);
  border: 1px dashed var(--color-neutral-300);
  border-radius: var(--radius-md);
  background: #fff;
  color: var(--color-neutral-600);
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}

.paper-dropzone.is-dragover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.08);
}

.paper-dropzone #paper_images {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.paper-dropzone-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.paper-camera-wrap {
  position: relative;
  display: inline-flex;
}

.paper-camera-wrap input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  pointer-events: none;
}

.paper-camera-btn {
  cursor: pointer;
  justify-content: center;
}

.paper-dropzone strong,
.paper-dropzone span {
  display: block;
}

.paper-dropzone strong {
  margin-bottom: var(--space-1);
  color: var(--color-neutral-800);
}

.paper-dropzone span {
  font-size: var(--text-sm);
  line-height: 1.5;
}

.paper-file-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.paper-file-list strong {
  flex-basis: 100%;
  color: var(--color-neutral-700);
  font-size: var(--text-sm);
}

.paper-file-list span {
  max-width: 100%;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  color: var(--color-neutral-600);
  font-size: var(--text-xs);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.paper-recognize-btn {
  width: 100%;
  justify-content: center;
}

.paper-recognition-status {
  min-height: 22px;
  font-size: var(--text-sm);
  color: var(--color-neutral-500);
}

.paper-recognition-status.is-loading {
  color: var(--color-primary);
  font-weight: var(--font-semibold);
}

.paper-recognition-status.is-loading::after {
  content: "";
  display: inline-block;
  width: 1.2em;
  animation: loadingDots 1.2s steps(4, end) infinite;
}

.paper-recognition-status.is-success {
  color: var(--color-success);
}

.paper-recognition-status.is-error {
  color: var(--color-danger);
}

@keyframes loadingDots {
  0% {
    content: "";
  }
  25% {
    content: ".";
  }
  50% {
    content: "..";
  }
  75%,
  100% {
    content: "...";
  }
}

.paper-crop-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-3);
}

.paper-crop-card {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-2);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: #fff;
}

.paper-crop-card img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: contain;
  border-radius: var(--radius-sm);
  background: var(--color-neutral-100);
}

.paper-crop-name {
  color: var(--color-neutral-600);
  font-size: var(--text-xs);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.paper-crop-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 10px;
}

.paper-crop-controls label {
  display: grid;
  gap: 2px;
  color: var(--color-neutral-600);
  font-size: var(--text-xs);
}

.paper-crop-controls input {
  padding: 0;
}

.paper-proofread {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  padding: var(--space-4);
  border: 1px solid var(--color-primary-border);
  border-radius: var(--radius-lg);
  background: #fff;
}

.paper-proofread[hidden] {
  display: none;
}

.paper-proofread-head {
  display: grid;
  gap: 2px;
}

.paper-proofread-head strong {
  color: var(--color-neutral-900);
}

.paper-proofread-head span {
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
}

.paper-proofread-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: var(--space-4);
  align-items: start;
}

.paper-proofread-source {
  position: sticky;
  top: var(--space-4);
  display: grid;
  gap: var(--space-3);
  max-height: 72vh;
  overflow: auto;
}

.paper-proofread-source img {
  width: 100%;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
}

.paper-proofread-segments {
  display: grid;
  gap: var(--space-3);
}

.paper-segment {
  display: grid;
  gap: var(--space-2);
}

.paper-segment span {
  color: var(--color-neutral-600);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
}

.paper-segment textarea {
  width: 100%;
  min-height: 112px;
  padding: 10px 12px;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  line-height: 1.7;
  resize: vertical;
}

.alert {
  margin-bottom: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
}

.alert-danger {
  border: 1px solid var(--color-danger-border);
  background: var(--color-danger-light);
  color: var(--color-danger);
}

/* 学生提交失败提示：必须一眼可见。
   学生从页面底部的「确认提交」发起，页面刷新后若提示不够醒目、或不在视野内，
   就会误以为已经提交成功（曾据此排查过「显示成功但后台没收到」的反馈）。 */
.alert-fail {
  margin-bottom: var(--space-4);
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--color-danger-border);
  border-left: 4px solid var(--color-danger);
  border-radius: var(--radius-md);
  background: var(--color-danger-light);
  color: var(--color-danger);
}

.alert-fail:focus {
  outline: none;
}

/* 提交页的「说明」类提示（如：这条任务已经批改完，不用再交了）。
   刻意不用 alert-fail 的红色：学生没有填错任何东西，红色会让人以为提交失败了。 */
.submit-notice {
  margin-bottom: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-neutral-200);
  border-left: 4px solid var(--color-neutral-400);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
  color: var(--color-neutral-700);
  font-size: var(--text-sm);
}

/* 「先填姓名 → 检测任务」（2026-09-20）：姓名与检测按钮同行；
   还没检测出任务时不渲染任务列表，这里给一块中性灰的占位说明。
   不用红色 —— 学生什么都没填错，只是还没开始。 */
.submit-name-row {
  display: flex;
  align-items: stretch;
  gap: var(--space-2);
}

.submit-name-row input {
  flex: 1 1 auto;
  min-width: 0;
}

.submit-name-row .btn {
  flex: 0 0 auto;
  white-space: nowrap;
}

.submit-detect-hint {
  margin: calc(-1 * var(--space-3)) 0 var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-neutral-600);
}

.submit-detect-hint strong {
  font-weight: var(--font-medium);
  color: var(--color-neutral-800);
}

.submit-detect-hint.is-warn {
  color: var(--color-danger-600);
}

.submit-task-locked {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4);
  border: 1px dashed var(--color-neutral-300);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
  color: var(--color-neutral-600);
  font-size: var(--text-sm);
}

.submit-task-locked strong {
  font-weight: var(--font-medium);
  color: var(--color-neutral-700);
}

.alert-fail h2 {
  margin: 0;
  font-size: var(--text-lg);
  font-weight: 600;
}

.alert-fail ul {
  margin: var(--space-3) 0 0;
  padding-left: 1.25em;
  font-size: var(--text-base);
  line-height: 1.7;
}

.alert-fail li + li {
  margin-top: var(--space-1);
}

.alert-fail-hint {
  margin: var(--space-3) 0 0;
  font-size: var(--text-sm);
  color: var(--color-neutral-600);
}

/* 缺少纸质稿图片时，把该区块整体标出来，别让学生去猜是哪一项没过 */
.submit-method--missing {
  border-color: var(--color-danger-border);
  background: var(--color-danger-light);
}

/* 提交按钮旁的失败提醒：学生视线常在页面底部，这里也要能看见 */
.submit-work-hint--fail {
  margin: 0;
  color: var(--color-danger);
  font-size: var(--text-sm);
  font-weight: 500;
}

/* 纸质稿校对态会隐藏提交区说明文字，但失败提醒不能被藏掉 */
.student-submit-form--work.is-paper-recognized .submit-work-actions p.submit-work-hint--fail {
  display: block;
}

/* 成功页的提交回执：老师没收到时，学生把这个编号报出来即可定位那一条记录 */
.submit-receipt {
  margin-top: var(--space-3);
  color: var(--color-neutral-500);
}
.submit-receipt strong {
  font-family: var(--font-mono);
  color: var(--color-neutral-800);
  font-weight: 600;
}

.onboarding {
  margin-top: var(--space-5);
  padding: var(--space-5);
  border: 1px solid var(--color-primary-border);
  border-radius: var(--radius-lg);
  background: var(--color-primary-light);
}

.onboarding h2 {
  margin: 0 0 var(--space-4);
  font-size: var(--text-lg);
}

.onboarding-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.onboarding-step {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: #fff;
}

.onboarding-step.is-active {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.08);
}

.onboarding-step__num {
  flex: 0 0 28px;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-bold);
}

.onboarding-step strong {
  display: block;
  margin-bottom: var(--space-1);
}

.onboarding-step p {
  margin: 0;
  color: var(--color-neutral-600);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

@media (max-width: 640px) {
  .copy-link {
    grid-template-columns: 1fr;
  }

  .submit-card {
    padding: var(--space-5);
  }

  .submit-methods {
    grid-template-columns: 1fr;
  }

  .submit-choice-grid {
    grid-template-columns: 1fr;
  }

  .paper-proofread-grid {
    grid-template-columns: 1fr;
  }

  .paper-proofread-source {
    position: static;
    max-height: 46vh;
  }

  .onboarding-steps {
    grid-template-columns: 1fr;
  }
}

/* ================================================================
   侧边栏布局系统 (v3.0)
   ================================================================ */
.app-layout {
  display: flex;
  min-height: calc(100vh - 45px);
}

.sidebar {
  position: sticky;
  top: 0;
  width: 220px;
  min-width: 220px;
  height: 100vh;
  overflow-y: auto;
  background: #fff;
  border-right: 1px solid var(--color-neutral-200);
  display: flex;
  flex-direction: column;
  padding: 0;
  transition: var(--transition-normal);
  z-index: 100;
}

.sidebar--hidden {
  display: none !important;
}

.app-layout:has(.sidebar--hidden) .app-main {
  max-width: none;
  width: 100%;
}

.app-layout:has(.sidebar--hidden) .submit-shell {
  display: block;
  max-width: 760px;
  min-height: auto;
  margin: 0 auto;
  padding: var(--space-6);
}

.app-layout:has(.sidebar--hidden) .submit-shell--work {
  max-width: 1180px;
  height: calc(100vh - 24px);
  padding: var(--space-3);
}

.app-layout:has(.sidebar--hidden) .submit-shell--work .submit-card {
  max-width: none;
  height: 100%;
  min-height: 0;
}

.app-layout:has(.sidebar--hidden) .submit-card {
  max-width: none;
}

.submit-card--work {
  overflow: hidden;
  padding: var(--space-4);
}

.submit-card--work:has(.student-submit-form--work.is-paper-recognized) {
  padding-bottom: var(--space-3);
}

.student-submit-form--work {
  display: grid;
  height: 100%;
  min-height: 0;
  grid-template-rows: auto minmax(0, 1fr) auto;
  gap: var(--space-3);
}

.submit-work-toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  justify-content: flex-end;
  min-height: 34px;
}

.submit-work-toolbar strong {
  margin-right: auto;
  color: var(--color-neutral-800);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
}

.submit-work-grid {
  display: grid;
  min-height: 0;
  gap: var(--space-4);
}

.submit-shell--paste .submit-work-grid {
  grid-template-columns: minmax(0, 2.4fr) minmax(260px, 0.8fr);
}

.submit-shell--docx .submit-work-grid {
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.8fr);
}

.submit-shell--paper .submit-work-grid {
  grid-template-columns: minmax(0, 1fr);
}

.submit-card--work .submit-text-panel,
.submit-card--work .submit-method {
  min-height: 0;
  margin: 0;
}

.submit-card--work .submit-text-panel {
  display: flex;
  flex-direction: column;
}

.submit-card--work .textarea-large {
  flex: 1;
  min-height: 0;
  height: 100%;
  resize: none;
}

.submit-card--work .paper-dropzone {
  min-height: 0;
  height: min(42vh, 360px);
}

.submit-shell--paper .submit-method--paper {
  min-height: min(70vh, 680px);
}

.submit-shell--paper .submit-method--paper .paper-dropzone {
  height: 100%;
  min-height: 420px;
}

.submit-shell--paper .submit-text-panel,
.submit-shell--paper .submit-work-actions {
  display: none;
}

.submit-shell--paper .student-submit-form--work.is-paper-recognized .submit-text-panel {
  display: flex;
}

.submit-shell--paper .student-submit-form--work.is-paper-recognized .submit-work-actions {
  display: flex;
}

.submit-work-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.student-submit-form--work.is-paper-recognized {
  gap: var(--space-2);
  grid-template-rows: auto minmax(0, 1fr) auto;
}

.student-submit-form--work.is-paper-recognized .submit-method--paper,
.student-submit-form--work.is-paper-recognized .submit-work-actions p {
  display: none;
}

.student-submit-form--work.is-paper-recognized .submit-work-grid {
  display: flex;
  min-height: 0;
  height: 100%;
  overflow: hidden;
}

.student-submit-form--work.is-paper-recognized .submit-text-panel {
  flex: 1;
  min-height: 0;
  height: 100%;
}

.student-submit-form--work.is-paper-recognized .textarea-large {
  font-size: 1.18rem;
  line-height: 2;
  min-height: 0;
  height: 100%;
  padding: var(--space-5);
  padding-bottom: calc(var(--space-5) + 72px);
  overflow-y: auto;
}

.student-submit-form--work.is-paper-recognized .submit-work-actions {
  flex-shrink: 0;
  justify-content: flex-end;
}

@media (max-width: 760px) {
  .app-layout:has(.sidebar--hidden) .app-main {
    padding: 0;
    background: #f7f8fb;
  }

  .app-layout:has(.sidebar--hidden) .submit-shell {
    width: 100%;
    max-width: none;
    min-height: 100vh;
    padding: 0;
  }

  .app-layout:has(.sidebar--hidden) .submit-card {
    min-height: 100vh;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    padding: var(--space-4);
  }

  .submit-card--entry {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
  }

  .submit-eyebrow {
    margin-bottom: 0;
    font-size: var(--text-xs);
  }

  .submit-card h1,
  .submit-work-head h1 {
    font-size: 1.35rem;
    line-height: 1.25;
  }

  .submit-prompt-compact .prompt-preview {
    max-height: 116px;
    font-size: 0.92rem;
    border-radius: var(--radius-md);
  }

  .submit-choice-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2);
    margin-bottom: 0;
  }

  .submit-choice {
    min-height: 68px;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    grid-template-columns: minmax(0, 1fr);
  }

  .submit-choice strong {
    font-size: 1rem;
  }

  .submit-choice span {
    font-size: 0.86rem;
  }

  .submit-card input,
  .submit-card select,
  .submit-card textarea {
    font-size: 16px;
  }

  .app-layout:has(.sidebar--hidden) .submit-shell--work {
    height: auto;
    min-height: 100dvh;
    padding: 0;
  }

  .submit-card--work {
    height: auto;
    min-height: 100dvh;
    padding: var(--space-3);
    overflow: visible;
  }

  .student-submit-form--work {
    height: auto;
    min-height: calc(100dvh - var(--space-6));
    grid-template-rows: auto auto auto;
    align-content: start;
    gap: var(--space-3);
  }

  .submit-work-toolbar {
    min-height: 0;
    justify-content: space-between;
    padding: var(--space-1) 0;
  }

  .submit-work-toolbar .btn {
    min-height: 36px;
    padding: var(--space-2) var(--space-3);
  }

  .submit-work-grid {
    min-height: 0;
    overflow: visible;
    padding-bottom: calc(76px + env(safe-area-inset-bottom));
  }

  .submit-shell--paste .submit-work-grid,
  .submit-shell--paper .submit-work-grid,
  .submit-shell--docx .submit-work-grid {
    grid-template-columns: 1fr;
  }

  .submit-card--work .textarea-large {
    min-height: 42dvh;
    height: auto;
    max-height: 58dvh;
    font-size: 1.06rem;
    line-height: 1.85;
    padding: var(--space-4);
    overflow-y: auto;
  }

  .submit-card--work .paper-dropzone,
  .submit-shell--paper .submit-method--paper .paper-dropzone {
    min-height: 260px;
    height: min(54vh, 460px);
    border-radius: var(--radius-lg);
  }

  .submit-shell--paper .submit-method--paper {
    min-height: 0;
  }

  .submit-method {
    padding: var(--space-3);
    border-radius: var(--radius-md);
  }

  .submit-work-actions {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 40;
    align-items: stretch;
    flex-direction: column;
    padding: var(--space-2) var(--space-3) calc(var(--space-2) + env(safe-area-inset-bottom));
    background: #fff;
    border-top: 1px solid var(--color-neutral-200);
    box-shadow: 0 -10px 18px rgba(15, 23, 42, 0.08);
  }

  .submit-work-actions .btn {
    width: 100%;
    min-height: 48px;
    font-size: 1rem;
  }

  .student-submit-form--work.is-paper-recognized {
    grid-template-rows: auto minmax(0, 1fr) auto;
    min-height: calc(100dvh - var(--space-6));
  }

  .student-submit-form--work.is-paper-recognized .submit-work-grid {
    display: flex;
    min-height: 0;
    overflow: hidden;
  }

  .student-submit-form--work.is-paper-recognized .submit-text-panel {
    flex: 1;
    min-height: 0;
  }

  .student-submit-form--work.is-paper-recognized .submit-text-panel label {
    margin-bottom: var(--space-2);
    font-size: 0.95rem;
  }

  .student-submit-form--work.is-paper-recognized .textarea-large {
    min-height: 0;
    height: 100%;
    max-height: none;
    font-size: 0.92rem;
    line-height: 1.65;
    padding: var(--space-3);
    overflow-y: auto;
  }

  .student-submit-form--work.is-paper-recognized .submit-work-actions {
    padding-bottom: env(safe-area-inset-bottom);
  }
}

.sidebar-brand {
  display: flex;
  align-items: center;
  padding: var(--space-4) var(--space-4);
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-primary);
  border-bottom: 1px solid var(--color-neutral-100);
  letter-spacing: 0.02em;
}

.login-logo {
  display: none;
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-3) var(--space-2);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-neutral-600);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  transition: var(--transition-fast);
}

.sidebar-item:hover {
  background: var(--color-neutral-100);
  color: var(--color-neutral-800);
}

.sidebar-item--primary {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: var(--font-semibold);
}

.sidebar-item--primary:hover {
  background: var(--color-primary-border);
  color: var(--color-primary-hover);
}

.sidebar-item--logout {
  margin-top: auto;
  color: var(--color-danger);
}

.sidebar-item--logout:hover {
  background: var(--color-danger-light);
}

.sidebar-item.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: var(--font-semibold);
}

.sidebar-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: var(--space-3) var(--space-2);
  border-top: 1px solid var(--color-neutral-100);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

/* ═══ 侧边栏邀请提示（两态：展开卡 / 克制图标） ═══ */
.sidebar-invite {
  margin: 0 0 var(--space-2);
}

.sidebar-invite__panel {
  border: 1px solid var(--color-primary-border);
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  padding: var(--space-3);
}

/* 自动展开时的醒目态（用户关闭后移除，安静下来） */
.sidebar-invite.is-attention .sidebar-invite__panel {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.12);
  animation: invite-attn 1.8s ease-in-out 2;
}

@keyframes invite-attn {
  0%, 100% { box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.12); }
  50% { box-shadow: 0 0 0 6px rgba(26, 86, 219, 0.22); }
}

@media (prefers-reduced-motion: reduce) {
  .sidebar-invite.is-attention .sidebar-invite__panel { animation: none; }
}

.sidebar-invite__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.sidebar-invite__title {
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  color: var(--color-primary);
}

.sidebar-invite__close {
  border: none;
  background: transparent;
  color: var(--color-neutral-500);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  padding: 0 2px;
  border-radius: var(--radius-sm);
}

.sidebar-invite__close:hover {
  color: var(--color-neutral-700);
  background: rgba(0, 0, 0, 0.05);
}

.sidebar-invite__desc {
  margin: var(--space-2) 0 0;
  font-size: 12px;
  line-height: 1.5;
  color: var(--color-neutral-600);
}

.sidebar-invite__actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.sidebar-invite__btn {
  flex: 1;
  text-align: center;
  font-size: 12px;
  padding: 5px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-neutral-200);
  background: #fff;
  color: var(--color-neutral-700);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sidebar-invite__btn:hover {
  border-color: var(--color-primary-border);
  color: var(--color-primary);
}

.sidebar-invite__btn--primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.sidebar-invite__btn--primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: #fff;
}

.sidebar-invite__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
  color: var(--color-neutral-500);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sidebar-invite__icon svg {
  width: 18px;
  height: 18px;
}

.sidebar-invite__icon:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary-border);
  color: var(--color-primary);
}

.sidebar-invite__icon:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* 额度提醒弹窗（主动提醒） */
.invite-pop {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 9999;
}

.invite-pop__box {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  min-width: 280px;
  max-width: 360px;
  background: #fff;
  border: 1px solid var(--color-primary-border);
  border-left: 4px solid #ef4444;
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  animation: invite-pop-in 0.3s ease-out;
}

@keyframes invite-pop-in {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.invite-pop__gift {
  font-size: 24px;
  line-height: 1;
  flex-shrink: 0;
}

.invite-pop__body strong {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-neutral-900);
  margin-bottom: 4px;
}

.invite-pop__body p {
  margin: 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--color-neutral-600);
}

.invite-pop__acts {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.invite-pop__btn {
  font-size: 12px;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-neutral-200);
  background: #fff;
  color: var(--color-neutral-700);
  text-decoration: none;
  cursor: pointer;
}

.invite-pop__btn--primary {
  background: #ef4444;
  border-color: #ef4444;
  color: #fff;
}

.invite-pop__btn--primary:hover {
  background: #dc2626;
}

@media (max-width: 640px) {
  .invite-pop { right: 10px; left: 10px; bottom: 10px; }
  .invite-pop__box { min-width: 0; max-width: none; }
}

[data-theme="dark"] .invite-pop__box {
  background: var(--color-neutral-800);
  border-color: var(--color-neutral-700);
}

[data-theme="dark"] .invite-pop__body strong {
  color: var(--color-neutral-100);
}

/* ═══ 邀请有礼页（/invite） ═══ */
.invite-hero {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}

.invite-hero__code,
.invite-hero__link {
  flex: 1;
  min-width: 260px;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  background: var(--color-neutral-50);
}

.invite-hero__codewrap {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.invite-hero__codewrap code {
  flex: 1;
  font-size: var(--text-lg);
  letter-spacing: 1px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.invite-steps {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-3);
  flex-wrap: wrap;
}

.invite-step {
  flex: 1;
  min-width: 140px;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  border: 1px dashed var(--color-neutral-300);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  opacity: 0.7;
}

.invite-step.is-done {
  border-style: solid;
  border-color: var(--color-primary-border);
  background: var(--color-primary-light);
  opacity: 1;
}

.invite-step__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--color-neutral-200);
  color: var(--color-neutral-600);
  font-size: 12px;
  font-weight: var(--font-bold);
  flex-shrink: 0;
}

.invite-step.is-done .invite-step__badge {
  background: var(--color-primary);
  color: #fff;
}

.invite-step__text {
  display: flex;
  flex-direction: column;
  line-height: 1.4;
}

/* 情境化邀请提示条 */
.invite-teaser {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  border: 1px solid var(--color-primary-border);
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-4);
}

[data-theme="dark"] .invite-hero__code,
[data-theme="dark"] .invite-hero__link {
  background: var(--color-neutral-800);
  border-color: var(--color-neutral-700);
}

[data-theme="dark"] .invite-step.is-done,
[data-theme="dark"] .invite-teaser {
  background: rgba(59, 130, 246, 0.12);
  border-color: rgba(59, 130, 246, 0.35);
}

.app-main {
  flex: 1;
  min-width: 0;
  padding: var(--space-6) var(--space-8);
  max-width: 1100px;
}

.site-legal-footer {
  min-height: 45px;
  padding: 12px 20px;
  border-top: 1px solid var(--color-neutral-200);
  background: #fff;
  color: var(--color-neutral-500);
  font-size: var(--text-xs);
  line-height: 20px;
  text-align: center;
}

.site-legal-footer a {
  color: inherit;
  text-decoration: none;
}

.site-legal-footer a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.app-main:has(.lesson-page--editor) {
  max-width: none;
  width: 100%;
  padding-right: 0;
}

.app-main:has(.lesson-shell) {
  max-width: none;
  width: 100%;
  padding: 0;
}

.theme-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: none;
  background: none;
  border-radius: var(--radius-md);
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: var(--transition-fast);
  width: 100%;
}

.theme-toggle:hover {
  background: var(--color-neutral-100);
  color: var(--color-neutral-700);
}

/* ================================================================
   登录 / 注册页
   ================================================================ */
.submit-shell {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 80px);
  padding: var(--space-6);
}

.submit-card {
  width: 100%;
  max-width: 420px;
  background: #fff;
  border-radius: var(--radius-xl);
  padding: var(--space-10) var(--space-8);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-neutral-200);
}

.submit-card--success {
  text-align: center;
  padding: var(--space-12) var(--space-8);
}

.submit-card h1 {
  margin: 0 0 var(--space-2);
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-neutral-900);
}

.submit-eyebrow {
  margin: 0 0 var(--space-1);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  font-weight: var(--font-semibold);
}

.login-demo-btn {
  display: block;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  margin: var(--space-5) 0;
  background: var(--color-primary);
  color: #fff;
  text-align: center;
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  text-decoration: none;
  transition: var(--transition-fast);
  border: none;
  cursor: pointer;
}

.login-demo-btn:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
}

.login-divider {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: var(--space-4) 0;
  color: var(--color-neutral-400);
  font-size: var(--text-sm);
}

.login-divider::before,
.login-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--color-neutral-200);
}

/* ================================================================
   发布引导页
   ================================================================ */
.publish-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin: var(--space-6) 0;
}

.publish-card {
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-3);
  transition: var(--transition-fast);
}

.publish-card:hover {
  border-color: var(--color-primary-border);
  box-shadow: var(--shadow-md);
}

.publish-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  background: var(--color-primary-light);
  border-radius: var(--radius-lg);
  color: var(--color-primary);
}

.publish-card h3 {
  margin: 0;
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
}

.publish-card p {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-neutral-500);
}

.publish-card .btn {
  margin-top: auto;
  width: 100%;
}

.publish-card input {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-neutral-300);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  text-align: center;
}

/* ─── 发布引导页 · 三卡片对齐布局 ────────────────────────── */
.publish-class-block {
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-bottom: var(--space-4);
}

.publish-class-head {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-neutral-100);
}

.publish-three {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-4);
}

.publish-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.publish-card-label {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-neutral-600);
  border-bottom: 1px solid var(--color-neutral-100);
  background: var(--color-neutral-50);
  text-align: center;
}

.publish-card-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  min-height: 120px;
}

.publish-card-body--paper {
  background: repeating-linear-gradient(0deg,
    transparent,
    transparent 18px,
    var(--color-neutral-100) 18px,
    var(--color-neutral-100) 19px);
}

.publish-url {
  font-size: var(--text-xs);
  padding: var(--space-2) var(--space-3);
  background: var(--color-neutral-50);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  word-break: break-all;
  max-width: 100%;
  line-height: 1.5;
}

.publish-qr-img {
  width: 100px;
  height: 100px;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
}

.paper-icon {
  width: 60px;
  height: 75px;
  color: var(--color-neutral-400);
}

.publish-card-actions {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-top: 1px solid var(--color-neutral-100);
  justify-content: center;
  background: var(--color-neutral-50);
}

.publish-card-actions .btn {
  flex: 1;
  justify-content: center;
}

[data-theme="dark"] .publish-class-block {
  background: var(--color-neutral-800);
  border-color: var(--color-neutral-700);
}

[data-theme="dark"] .publish-class-head {
  border-bottom-color: var(--color-neutral-700);
}

[data-theme="dark"] .publish-card {
  border-color: var(--color-neutral-700);
}

[data-theme="dark"] .publish-card-label,
[data-theme="dark"] .publish-card-actions {
  background: var(--color-neutral-750);
  border-color: var(--color-neutral-700);
}

[data-theme="dark"] .publish-card-body--paper {
  background: repeating-linear-gradient(0deg,
    transparent,
    transparent 18px,
    var(--color-neutral-750) 18px,
    var(--color-neutral-750) 19px);
}

[data-theme="dark"] .publish-url {
  background: var(--color-neutral-750);
  border-color: var(--color-neutral-600);
}

@media (max-width: 900px) {
  .publish-three {
    grid-template-columns: 1fr;
  }
}

/* ================================================================
   作文查看页 · 批改结果
   ================================================================ */
.essay-view-header {
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.essay-view-info h2 {
  margin: 0 0 var(--space-1);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
}

.essay-view-meta {
  display: flex;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-neutral-500);
}

.essay-view-actions {
  display: flex;
  gap: var(--space-2);
  align-items: center;
  flex-wrap: wrap;
}

.essay-view-identity {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  min-width: 0;
  color: var(--color-neutral-700);
  font-size: var(--text-sm);
}

.essay-view-identity > span {
  min-width: 0;
}

.essay-view-identity > strong {
  font-size: var(--text-base);
}

.essay-word-count {
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  white-space: nowrap;
}

.essay-view-nav {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: #fff;
}

.essay-nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 30px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  text-decoration: none;
}

.essay-nav-link:hover {
  background: var(--color-primary-light);
}

.essay-nav-link.disabled {
  color: var(--color-neutral-400);
  pointer-events: none;
}

.essay-result-sheet {
  max-width: 980px;
  margin: 0 auto;
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.essay-html-review-layout {
  display: block;
  position: relative;
}

.essay-html-review-layout--focus {
  display: grid;
  grid-template-columns: 980px 360px;
  gap: var(--space-5);
  align-items: start;
  width: max-content;
  max-width: none;
}

.essay-html-review-main {
  min-width: 0;
}

.essay-html-review-layout--focus .essay-html-review-main {
  width: 980px;
}

.temporary-review-panel {
  position: static;
  display: grid;
  gap: var(--space-3);
  width: auto;
  max-height: none;
  overflow: auto;
  margin-top: var(--space-4);
  padding: var(--space-4);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.essay-html-review-layout--focus .temporary-review-panel {
  position: sticky;
  top: 84px;
  width: 360px;
  max-height: calc(100vh - 104px);
  margin-top: 0;
}

.temporary-review-head h2 {
  margin: 0;
  font-size: var(--text-lg);
}

.temporary-review-head p {
  margin: var(--space-1) 0 0;
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
  line-height: 1.5;
}

.temporary-review-panel form {
  display: grid;
  gap: var(--space-2);
}

.temporary-review-panel label {
  color: var(--color-neutral-700);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
}

.temporary-review-readonly,
.temporary-review-panel textarea {
  width: 100%;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
  color: var(--color-neutral-700);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.temporary-review-readonly {
  max-height: 180px;
  overflow: auto;
  padding: 10px 12px;
  white-space: pre-wrap;
}

.temporary-review-panel textarea {
  min-height: 360px;
  padding: 10px 12px;
  resize: vertical;
  background: #fff;
}

.temporary-review-actions {
  display: grid;
  gap: var(--space-2);
}

.essay-result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: var(--color-neutral-50);
  border-bottom: 1px solid var(--color-neutral-200);
  font-weight: var(--font-semibold);
  font-size: var(--text-sm);
  cursor: pointer;
  user-select: none;
}

.essay-result-body {
  padding: var(--space-5);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  overflow-x: auto;
  color: var(--color-neutral-800);
}

.essay-result-body p {
  margin: 0 0 var(--space-4);
  text-indent: 2em;
  line-height: 2;
}

.essay-result-body p:last-child {
  margin-bottom: 0;
}

.essay-result-body h1,
.essay-result-body h2,
.essay-result-body h3,
.essay-result-body h4 {
  margin: var(--space-5) 0 var(--space-3);
  font-weight: var(--font-semibold);
  color: var(--color-neutral-900);
}

.essay-result-body h1 { font-size: var(--text-xl); }
.essay-result-body h2 { font-size: var(--text-lg); }
.essay-result-body h3 { font-size: var(--text-base); }
.essay-result-body h4 { font-size: var(--text-sm); }

.essay-result-body strong {
  font-weight: var(--font-semibold);
  color: var(--color-primary);
}

.essay-result-body ul, .essay-result-body ol {
  margin: 0 0 var(--space-3);
  padding-left: var(--space-6);
  line-height: 2;
}

.essay-result-body li {
  margin-bottom: var(--space-1);
}

.essay-result-body .review-annot {
  color: #b42318;
  font-weight: var(--font-normal);
  background: #fff1f0;
  border-radius: 4px;
  padding: 0 3px;
}

.essay-result-body pre {
  margin: 0 0 var(--space-4);
  white-space: pre-wrap;
  word-wrap: break-word;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 2;
  max-height: 600px;
  overflow-y: auto;
  background: var(--color-neutral-50);
  padding: var(--space-3);
  border-radius: var(--radius-md);
}

/* ================================================================
   侧边批注模式（essay_view 双列）
   ================================================================ */
.app-main:has(.essay-view-page) {
  max-width: none;
}

.essay-view-page {
  max-width: 1180px;
}

.essay-view-page:has(.essay-html-review-layout--focus) {
  width: max-content;
  max-width: none;
}

.essay-view-page--side {
  max-width: 1440px;
}

.essay-view-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
  position: sticky;
  top: 0;
  z-index: 30;
  padding: var(--space-3);
  margin-left: calc(-1 * var(--space-3));
  margin-right: calc(-1 * var(--space-3));
  background: rgba(250, 248, 245, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-neutral-200);
}

.essay-view-toolbar--html {
  margin-bottom: var(--space-4);
}

.view-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  background: var(--color-neutral-100);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
}

.view-switch__item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 30px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-neutral-600);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  text-decoration: none;
}

.view-switch__item:hover {
  color: var(--color-neutral-900);
  background: #fff;
}

.view-switch__item.active {
  color: var(--color-primary);
  background: #fff;
  box-shadow: var(--shadow-xs);
}

.view-switch__item.disabled {
  color: var(--color-neutral-400);
  pointer-events: none;
}

/* ─── 原文查看 ─────────────────────────────────────────────── */
.raw-essay-content {
  max-width: 860px;
  margin: 0 auto var(--space-5);
}

.raw-essay-text {
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  font-family: var(--font-sans);
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-neutral-800);
}

.raw-essay-text p {
  margin: 0 0 var(--space-4);
  text-indent: 2em;
  line-height: 2;
}

.raw-essay-text p:last-child {
  margin-bottom: 0;
}

.raw-essay-byline {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-6);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-neutral-100);
}

.raw-essay-byline .author {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-neutral-600);
  white-space: nowrap;
}

.raw-essay-byline .title {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-neutral-900);
}

[data-theme="dark"] .raw-essay-byline {
  border-bottom-color: var(--color-neutral-700);
}

[data-theme="dark"] .raw-essay-byline .author {
  color: var(--color-neutral-400);
}

[data-theme="dark"] .raw-essay-byline .title {
  color: var(--color-neutral-100);
}

[data-theme="dark"] .raw-essay-text {
  background: var(--color-neutral-800);
  border-color: var(--color-neutral-700);
  color: var(--color-neutral-100);
}

.side-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: var(--space-5);
  align-items: start;
}

.side-main {
  min-width: 0;
}

.side-aside {
  position: sticky;
  top: 76px;
  max-height: calc(100vh - 96px);
  overflow: auto;
  padding-right: 2px;
}

.side-aside h2 {
  margin-bottom: var(--space-3);
}

.side-paper {
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  line-height: var(--leading-relaxed);
  font-size: var(--text-base);
  white-space: pre-wrap;
  word-wrap: break-word;
}

.side-paper h1 {
  margin: var(--space-6) 0 var(--space-5);
  font-size: var(--text-2xl);
}

.side-paper .side-anchor {
  display: inline;
  background: transparent;
  transition: var(--transition-fast);
  cursor: default;
  border-bottom: 2px solid transparent;
  padding: 1px 0;
}

.side-paper .side-anchor:hover {
  background: var(--color-warning-light);
  border-bottom-color: var(--color-warning);
}

.side-essay {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.side-comment {
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  cursor: pointer;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  margin-bottom: var(--space-3);
}

.side-comment.active {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.08);
}

.side-comment-head {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-neutral-500);
}

.side-idx {
  font-weight: var(--font-bold);
  color: var(--color-primary);
}

.side-tag {
  display: inline-block;
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
}

.side-tag--good {
  background: var(--color-success-light);
  color: var(--color-success);
}

.side-tag--bad {
  background: var(--color-danger-light);
  color: var(--color-danger);
}

.side-tag--warn {
  background: var(--color-warning-light);
  color: var(--color-warning);
}

.side-mark {
  position: relative;
  display: inline;
  padding: 2px 4px;
  border-radius: var(--radius-sm);
  background: var(--color-warning-light);
  box-shadow: inset 0 -2px 0 var(--color-warning-border);
  cursor: pointer;
  transition: background var(--transition-fast), box-shadow var(--transition-fast);
}

.side-mark:hover,
.side-mark.active {
  background: #fef3c7;
  box-shadow: inset 0 -2px 0 var(--color-warning), 0 0 0 3px rgba(217, 119, 6, 0.12);
}

.side-panel {
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--space-3);
}

.side-panel h3, .side-panel h4 {
  margin: 0;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  border-bottom: 1px solid var(--color-neutral-200);
}

.side-score {
  padding: var(--space-3) var(--space-4);
  background: var(--color-primary-light);
  font-weight: var(--font-semibold);
  font-size: var(--text-base);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-5);
}

.side-meta {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  padding: 0;
  font-size: var(--text-sm);
  color: var(--color-neutral-600);
}

.note-badge {
  position: absolute;
  top: -8px;
  right: -8px;
  min-width: 18px;
  height: 18px;
  background: var(--color-primary);
  color: #fff;
  font-size: 10px;
  line-height: 18px;
  text-align: center;
  padding: 0 5px;
  border-radius: var(--radius-full);
  font-weight: var(--font-bold);
  box-shadow: var(--shadow-sm);
}

.correcting-card {
  margin-bottom: var(--space-4);
  border-color: var(--color-primary-border);
  background: linear-gradient(180deg, #fff, var(--color-primary-light));
}

.loading-dots {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  margin-left: 4px;
  vertical-align: middle;
}

.loading-dots--badge {
  margin-left: 5px;
}

.loading-dots--badge i {
  width: 3px;
  height: 3px;
}

.loading-dots i {
  display: block;
  width: 4px;
  height: 4px;
  border-radius: 999px;
  background: currentColor;
  animation: loading-dot 1s infinite ease-in-out;
}

.loading-dots i:nth-child(2) {
  animation-delay: 0.15s;
}

.loading-dots i:nth-child(3) {
  animation-delay: 0.3s;
}

@keyframes progress-badge-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.22);
  }
  70% {
    box-shadow: 0 0 0 6px rgba(37, 99, 235, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(37, 99, 235, 0);
  }
}

@keyframes loading-dot {
  0%, 80%, 100% {
    opacity: 0.25;
    transform: translateY(0);
  }
  40% {
    opacity: 1;
    transform: translateY(-3px);
  }
}

.progress-bar--indeterminate {
  overflow: hidden;
}

.progress-bar--indeterminate .progress-bar__fill {
  width: 36%;
  animation: indeterminate-progress 1.4s infinite ease-in-out;
}

@keyframes indeterminate-progress {
  0% {
    transform: translateX(-110%);
  }
  100% {
    transform: translateX(300%);
  }
}

.app-main:has(.real-side-layout) {
  max-width: none;
  padding: 0;
}

.essay-view-page--side {
  max-width: none;
}

.essay-view-page--side .essay-view-toolbar {
  margin: 0;
  padding: var(--space-3) var(--space-6);
  border-bottom: 1px solid var(--color-neutral-200);
}

.real-side-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 390px;
  min-height: calc(100vh - 62px);
  background: #f5f6f8;
}

.real-side-main {
  padding: 28px;
  min-width: 0;
}

.real-side-paper {
  max-width: 900px;
  margin: 0 auto;
  background: #fff;
  border: 1px solid #d6dce6;
  border-radius: 8px;
  padding: 34px 42px;
  box-shadow: 0 14px 32px rgba(16, 24, 40, 0.07);
}

.real-side-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  color: #667085;
  font-size: 14px;
  margin-bottom: 14px;
}

.real-side-paper h1 {
  margin: 0 0 12px;
  font-size: 30px;
  line-height: 1.3;
  text-align: center;
  letter-spacing: 0;
}

.real-side-score {
  width: max-content;
  margin: 0 auto 26px;
  padding: 8px 14px;
  border: 1px solid #bad2ff;
  border-radius: 6px;
  background: #eef5ff;
  color: #164a9f;
  font-weight: 700;
}

.real-side-essay p {
  margin: 0 0 18px;
  font-size: 17px;
  line-height: 1.78;
  text-indent: 2em;
}

.real-mark {
  border-bottom: 2px solid #d99a00;
  background: linear-gradient(transparent 45%, #fff0a8 45%);
  cursor: pointer;
  scroll-margin-top: 96px;
  border-radius: 4px;
  padding: 0 2px;
  transition: background 0.15s ease, outline 0.15s ease, box-shadow 0.15s ease;
}

.real-mark:hover,
.real-mark:focus,
.real-mark.active {
  outline: 3px solid rgba(22, 88, 182, 0.62);
  outline-offset: 3px;
  background: #ffd84d;
  box-shadow: 0 0 0 7px rgba(255, 216, 77, 0.35), 0 8px 20px rgba(22, 88, 182, 0.18);
}

.real-mark.pulse {
  animation: real-mark-pulse 1.15s ease-out 1;
}

.real-mark--manual {
  outline: 2px dashed rgba(185, 28, 28, 0.4);
  outline-offset: 2px;
  background: #fff1f2;
}

@keyframes real-mark-pulse {
  0% {
    background: #fff7b8;
    box-shadow: 0 0 0 0 rgba(31, 111, 235, 0.45);
  }
  35% {
    background: #ffd84d;
    box-shadow: 0 0 0 12px rgba(31, 111, 235, 0.24);
  }
  100% {
    background: #ffd84d;
    box-shadow: 0 0 0 7px rgba(255, 216, 77, 0.35), 0 8px 20px rgba(22, 88, 182, 0.18);
  }
}

.real-note-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  margin: 0 2px;
  border-radius: 50%;
  background: #1f6feb;
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  text-indent: 0;
  vertical-align: 0.12em;
}

.real-review-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.real-panel {
  border: 1px solid #d6dce6;
  border-radius: 8px;
  padding: 14px;
  background: #fbfcff;
}

.real-panel--suggestions {
  margin-top: 14px;
  background: #fffdf7;
}

.real-panel h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.real-panel ol {
  margin: 0;
  padding-left: 20px;
  font-size: 14px;
  color: #344054;
}

.real-panel-empty,
.real-comment-empty {
  margin: 0;
  color: #667085;
  font-size: 14px;
  line-height: 1.7;
}

.real-comment-empty {
  border: 1px dashed #b7c2d0;
  border-radius: 8px;
  padding: 14px;
  margin-bottom: 12px;
  background: #f8fafc;
}

.real-side-comments {
  position: sticky;
  top: 0;
  height: calc(100vh - 62px);
  overflow: auto;
  border-left: 1px solid #d6dce6;
  background: #fff;
  padding: 22px;
}

.real-side-comments h2 {
  margin-top: 0;
  font-size: 20px;
}

.real-comment {
  border: 1px solid #d6dce6;
  border-radius: 8px;
  padding: 14px;
  margin-bottom: 12px;
  background: #fff;
  cursor: pointer;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.real-comment:hover,
.real-comment.active {
  border-color: #1f6feb;
  box-shadow: 0 8px 22px rgba(31, 111, 235, 0.13);
  background: #f6f9ff;
}

.real-comment-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.real-idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #1f6feb;
  color: #fff;
  font-size: 13px;
  font-weight: 700;
}

.real-tag {
  padding: 2px 7px;
  border-radius: 999px;
  background: #eef2f6;
  color: #475467;
  font-size: 12px;
  white-space: nowrap;
}

.real-tag.good {
  background: #e9f8ef;
  color: #16823a;
}

.real-tag.warn {
  background: #fff4e5;
  color: #b45309;
}

.real-tag.bad {
  background: #fff1f0;
  color: #b42318;
}

.real-anchor {
  margin: 0 0 8px;
  color: #667085;
  font-size: 13px;
  line-height: 1.5;
}

.real-comment p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
}

.real-comment .annotation-comment {
  color: #b42318;
}

/* ================================================================
   批改工作台（任务详情页）
   ================================================================ */
.app-main:has(.grading-workbench) {
  max-width: none;
}

.grading-workbench {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, var(--grading-side-width, 340px));
  gap: var(--space-5);
  align-items: start;
}

.grading-main {
  min-width: 0;
}

.grading-header {
  position: sticky;
  top: 0;
  z-index: 25;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  margin: calc(-1 * var(--space-2)) calc(-1 * var(--space-2)) var(--space-3);
  padding: var(--space-2);
  background: rgba(250, 248, 245, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-neutral-200);
}

.grading-header h1 {
  margin-bottom: var(--space-2);
}

.grading-header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
  flex: 0 0 auto;
}

.grading-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
}

.grading-meta .absent-list > summary {
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-danger-border);
  border-radius: var(--radius-md);
  background: var(--color-danger-light);
  color: var(--color-danger);
  cursor: pointer;
  font-weight: var(--font-medium);
  list-style: none;
}

.grading-meta .absent-list > summary::-webkit-details-marker {
  display: none;
}

.grading-meta .absent-names {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  max-width: 680px;
  margin-top: var(--space-2);
  padding: var(--space-3);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: #fff;
  box-shadow: var(--shadow-md);
}

.missing-name {
  display: inline-flex;
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  background: var(--color-neutral-50);
  color: var(--color-neutral-700);
}

.grading-list-card {
  padding: var(--space-5);
}

.grading-list-toolbar {
  position: sticky;
  top: 76px;
  z-index: 20;
  margin-bottom: var(--space-3);
  padding: var(--space-2) 0 var(--space-3);
  background: #fff;
  border-bottom: 1px solid var(--color-neutral-100);
}

.grading-list-title {
  margin-bottom: var(--space-2);
}

.grading-action-bar {
  margin-bottom: 0;
}

.grading-action-bar .task-report-entry {
  margin-left: var(--space-6);
  min-width: 116px;
}

.grading-action-bar .task-report-entry.is-disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.report-confirm-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  background: rgba(17, 24, 39, 0.34);
}

.report-confirm-dialog {
  width: min(520px, 100%);
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow-lg);
}

.report-confirm-dialog h3 {
  margin: 0 0 var(--space-3);
  font-size: var(--text-lg);
}

.report-confirm-dialog p {
  margin: 0;
  color: var(--color-neutral-700);
  line-height: 1.75;
}

.report-confirm-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

.grading-action-bar .btn-warning,
.grading-action-bar .btn-primary {
  min-height: 42px;
  padding-inline: var(--space-5);
  font-size: var(--text-base);
}

.grading-table-wrapper {
  overflow-x: auto;
}

.grading-table-wrapper table {
  min-width: 900px;
}

.essay-title-head,
.essay-title-cell {
  width: 280px;
  max-width: 280px;
}

.essay-title-cell {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.select-menu {
  position: relative;
  flex: 0 0 auto;
}

.select-menu > summary {
  list-style: none;
  cursor: pointer;
}

.select-menu > summary::-webkit-details-marker {
  display: none;
}

.select-menu > summary::after {
  content: "⌄";
  margin-left: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-neutral-500);
}

.select-menu > summary.btn-primary,
.select-menu > summary.btn-primary:hover,
.select-menu[open] > summary.btn-primary {
  color: #fff;
}

.select-menu > summary.btn-primary::after,
.select-menu > summary.btn-primary:hover::after,
.select-menu[open] > summary.btn-primary::after {
  color: rgba(255, 255, 255, 0.82);
}

.select-menu[open] > summary::after {
  content: "⌃";
}

.select-menu__panel {
  position: absolute;
  left: 0;
  top: calc(100% + var(--space-2));
  z-index: 40;
  min-width: 150px;
  padding: var(--space-2);
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}

.select-menu__item {
  display: block;
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-neutral-700);
  font: inherit;
  font-size: var(--text-sm);
  text-align: left;
  cursor: pointer;
  white-space: nowrap;
}

.select-menu__item:hover {
  background: var(--color-neutral-100);
  color: var(--color-neutral-900);
}

/* 任务行"更多"：无框横省略号 … 触发 + 悬浮菜单 */
.task-more {
  position: relative;
  display: inline-block;
  vertical-align: middle;
}
.task-more > summary {
  list-style: none;
  display: inline;
  margin-left: var(--space-2);
  padding: 0 4px;
  color: var(--color-neutral-500);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  user-select: none;
  letter-spacing: 2px;
  transition: color var(--transition-fast);
}
.task-more > summary::-webkit-details-marker { display: none; }
.task-more > summary::before { content: "…"; }          /* 横省略号，无外框 */
.task-more > summary::after { display: none; }            /* 去掉下拉箭头 */
.task-more > summary:hover,
.task-more[open] > summary { color: var(--color-neutral-900); }
.task-more > summary .vis-hidden { position: absolute; width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);}

.task-more__panel {
  position: absolute;
  right: -2px;
  top: calc(100% + 4px);
  z-index: 60;
  min-width: 158px;
  padding: var(--space-1);
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(23, 41, 65, 0.12);
}
.task-more__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-neutral-700);
  font: inherit;
  font-size: var(--text-sm);
  text-align: left;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
}
.task-more__item:hover {
  background: var(--color-neutral-100);
  color: var(--color-neutral-900);
}
.task-more__item--danger { color: var(--color-danger, #d14444); }
.task-more__item--danger:hover { background: #fdeef0; color: #b02f35; }
.task-more__ic { color: var(--color-neutral-400); width: 14px; text-align: center; }

.grading-side {
  position: sticky;
  top: var(--space-5);
  max-height: calc(100vh - var(--space-10));
  overflow: auto;
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.grading-column-resizer {
  position: absolute;
  top: var(--space-5);
  right: calc(var(--grading-side-width, 340px) - 8px);
  z-index: 15;
  width: 16px;
  min-height: calc(100vh - var(--space-10));
  cursor: col-resize;
}

.grading-column-resizer::before {
  content: "";
  position: absolute;
  top: 16px;
  bottom: 16px;
  left: 7px;
  width: 2px;
  border-radius: 999px;
  background: transparent;
  transition: background 0.15s ease;
}

.grading-column-resizer:hover::before,
.grading-workbench.is-resizing-side .grading-column-resizer::before {
  background: var(--color-primary-300);
}

.grading-workbench.is-resizing-side,
.grading-workbench.is-resizing-side * {
  user-select: none;
}

.grading-side-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding: var(--space-2);
  gap: var(--space-1);
  border-bottom: 1px solid var(--color-neutral-100);
  background: var(--color-neutral-50);
}

.grading-side-tab {
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-neutral-500);
  font: inherit;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  padding: var(--space-2);
}

.grading-side-tab.active {
  background: #fff;
  color: var(--color-primary);
  box-shadow: var(--shadow-xs);
}

.grading-side-tab:disabled {
  opacity: 0.55;
}

.grading-side-section {
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-neutral-100);
}

.grading-side-section:last-child {
  border-bottom: 0;
}

.grading-side-section h3 {
  margin-bottom: var(--space-3);
  font-size: var(--text-base);
  color: var(--color-neutral-800);
}

.grading-side-text {
  max-height: 260px;
  overflow: auto;
  white-space: pre-wrap;
  color: var(--color-neutral-700);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

.grading-side textarea {
  width: 100%;
  min-height: 280px;
  resize: vertical;
  margin-bottom: var(--space-3);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

@media (max-width: 1020px) {
  .app-main:has(.real-side-layout) {
    padding: var(--space-4);
  }

  .real-side-layout {
    display: block;
  }

  .real-side-main {
    padding: 16px 0;
  }

  .real-side-paper {
    padding: 24px 18px;
  }

  .real-side-comments {
    position: static;
    height: auto;
    border-left: 0;
    border-top: 1px solid #d6dce6;
  }

  .real-review-grid {
    grid-template-columns: 1fr;
  }

  .grading-workbench {
    grid-template-columns: 1fr;
  }

  .grading-column-resizer {
    display: none;
  }

  .grading-side {
    position: static;
    max-height: none;
  }
}

.review-annot {
  color: #b42318;
  font-weight: var(--font-normal);
}

/* ================================================================
   搜索框
   ================================================================ */
.search-box {
  position: relative;
  max-width: 320px;
}

.search-box__input {
  width: 100%;
  padding: var(--space-2) var(--space-3) var(--space-2) var(--space-8);
  border: 1px solid var(--color-neutral-300);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  background: #fff;
  transition: var(--transition-fast);
}

.search-box__input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.1);
}

.search-box__icon {
  position: absolute;
  left: var(--space-2);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-neutral-400);
  width: 16px;
  height: 16px;
  pointer-events: none;
}

.search-results {
  font-size: var(--text-sm);
  color: var(--color-neutral-500);
  margin-top: var(--space-2);
}

/* ================================================================
   统计行 / 统计项
   ================================================================ */
.stats-row {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  min-width: 100px;
}

.stat-item__value {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-primary);
}

.stat-item__label {
  font-size: var(--text-xs);
  color: var(--color-neutral-500);
  margin-top: var(--space-1);
}

/* ================================================================
   实用组件
   ================================================================ */
.pill {
  display: inline-block;
  padding: 1px 8px;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  background: var(--color-neutral-100);
  color: var(--color-neutral-600);
}

.optional {
  font-size: var(--text-xs);
  color: var(--color-neutral-400);
  font-weight: var(--font-normal);
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-16) var(--space-6);
  text-align: center;
}

.empty-state__icon {
  font-size: 48px;
  margin-bottom: var(--space-4);
  opacity: 0.4;
}

.empty-state__title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-2);
  color: var(--color-neutral-700);
}

.empty-state__desc {
  font-size: var(--text-sm);
  color: var(--color-neutral-500);
  max-width: 360px;
  line-height: var(--leading-relaxed);
}

.checklist {
  list-style: none;
  padding: 0;
  margin: 0;
}

.checkitem {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  font-size: var(--text-sm);
}

/* ─── 页面标题与操作栏 ───────────────────────────────────────── */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
  gap: var(--space-3);
}

.page-header h1 {
  margin: 0;
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
}

.page-actions {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

/* ─── 任务详情页按钮栏 ───────────────────────────────────────── */
.action-bar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

/* ─── 缺交名单 ───────────────────────────────────────────────── */
.absent-list {
  margin-top: var(--space-2);
}

.absent-list--inline {
  position: relative;
  margin-top: 0;
}

.absent-list--inline summary {
  list-style: none;
}

.absent-list--inline summary::-webkit-details-marker {
  display: none;
}

.absent-list--inline .absent-names {
  position: absolute;
  left: 0;
  top: calc(100% + 8px);
  width: min(520px, 70vw);
  max-height: 260px;
  overflow: auto;
  padding: var(--space-3);
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 40;
}

.absent-list summary {
  cursor: pointer;
  font-size: var(--text-sm);
  color: var(--color-neutral-600);
  user-select: none;
}

.absent-list summary:hover {
  color: var(--color-primary);
}

.absent-names {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-top: var(--space-2);
}

.absent-names span {
  padding: 2px 8px;
  background: var(--color-warning-light);
  border: 1px solid var(--color-warning-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  color: var(--color-warning);
}

/* ─── 写作/批改要求折叠 ──────────────────────────────────────── */
.task-prompt-grid {
  display: grid;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.task-prompt-grid-bar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) 0;
  font-size: var(--text-sm);
  color: var(--color-neutral-500);
}

.task-prompt-grid.expanded-all {
  grid-template-columns: 1fr 2fr;
}

.task-prompt-grid.expanded-writing {
  grid-template-columns: 1fr;
}

.task-prompt-grid.expanded-review {
  grid-template-columns: 1fr;
}

.task-prompt-grid.expanded-none {
  grid-template-columns: 1fr;
}

.task-prompt-section {
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition-normal);
}

.task-prompt-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: var(--color-neutral-50);
  border-bottom: 1px solid var(--color-neutral-200);
  cursor: pointer;
  user-select: none;
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
}

.task-prompt-header:hover {
  background: var(--color-neutral-100);
}

.task-prompt-body {
  padding: var(--space-4);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  color: var(--color-neutral-600);
  max-height: 666px;
  overflow-y: auto;
  transition: max-height var(--transition-normal);
}

.task-prompt-body.collapsed {
  max-height: 0;
  padding: 0 var(--space-4);
  overflow: hidden;
}

.task-prompt-body pre {
  margin: 0;
  white-space: pre-wrap;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

.task-prompt-body textarea {
  width: 100%;
  min-height: 300px;
  padding: var(--space-3);
  border: 1px solid var(--color-neutral-300);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  resize: vertical;
}

.task-prompt-body textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.1);
}

/* ─── 暗色主题覆写 ──────────────────────────────────────────── */
[data-theme="dark"] .sidebar {
  background: var(--color-neutral-900);
  border-right-color: var(--color-neutral-700);
}

[data-theme="dark"] .sidebar-brand {
  border-bottom-color: var(--color-neutral-700);
  color: var(--color-primary-border);
}

[data-theme="dark"] .sidebar-item {
  color: var(--color-neutral-400);
}

[data-theme="dark"] .sidebar-item:hover {
  background: var(--color-neutral-800);
  color: var(--color-neutral-200);
}

[data-theme="dark"] .sidebar-item--primary {
  background: rgba(26, 86, 219, 0.15);
  color: var(--color-primary-border);
}

[data-theme="dark"] .sidebar-footer {
  border-top-color: var(--color-neutral-700);
}

[data-theme="dark"] .submit-card,
[data-theme="dark"] .publish-card,
[data-theme="dark"] .side-paper,
[data-theme="dark"] .side-comment,
[data-theme="dark"] .side-panel,
[data-theme="dark"] .essay-view-header,
[data-theme="dark"] .task-prompt-section {
  background: var(--color-neutral-800);
  border-color: var(--color-neutral-700);
}

[data-theme="dark"] .login-demo-btn {
  background: var(--color-primary-hover);
}

[data-theme="dark"] .task-prompt-header {
  background: var(--color-neutral-750);
  border-bottom-color: var(--color-neutral-700);
}

[data-theme="dark"] .search-box__input {
  background: var(--color-neutral-800);
  border-color: var(--color-neutral-600);
  color: var(--color-neutral-200);
}

/* ================================================================
   响应式 · 小屏
   ================================================================ */
@media (max-width: 768px) {
  .app-layout {
    flex-direction: column;
  }

  .sidebar {
    position: static;
    height: auto;
    overflow: visible;
    width: 100%;
    min-width: 0;
    flex-direction: row;
    flex-wrap: wrap;
    padding: var(--space-2) var(--space-3);
    border-right: none;
    border-bottom: 1px solid var(--color-neutral-200);
  }

  .sidebar-brand {
    padding: var(--space-2) var(--space-3);
    border-bottom: none;
    font-size: var(--text-base);
  }

  .sidebar-nav {
    flex-direction: row;
    padding: 0;
    gap: var(--space-1);
  }

  .sidebar-footer {
    flex-direction: row;
    border-top: none;
    padding: 0;
    margin-left: auto;
  }

  .sidebar-item {
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-xs);
  }

}

/* ─── 表单选择器 ──────────────────────────────────────────── */
.form-select,
.form-input {
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-neutral-300);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-family: var(--font-sans);
  background: #fff;
  color: var(--color-neutral-700);
  transition: var(--transition-fast);
  cursor: pointer;
  height: 38px;
  line-height: 1.4;
}

.form-select:hover,
.form-input:hover {
  border-color: var(--color-neutral-400);
}

.form-select:focus,
.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.1);
}

.form-select option {
  padding: var(--space-1) var(--space-2);
}

[data-theme="dark"] .form-select,
[data-theme="dark"] .form-input {
  background: var(--color-neutral-800);
  border-color: var(--color-neutral-600);
  color: var(--color-neutral-200);
}

  .sidebar-icon {
    width: 14px;
    height: 14px;
  }

  .theme-toggle {
    width: auto;
  }

  .app-main {
    padding: var(--space-4);
  }

  .publish-cards {
    grid-template-columns: 1fr;
  }

  .side-layout {
    grid-template-columns: 1fr;
  }

  .side-aside {
    position: static;
  }

  .task-prompt-grid.expanded-all {
    grid-template-columns: 1fr;
  }
}

/* ─── 班级代码徽标 ────────────────────────────────────────── */
.class-code-badge {
  display: inline-block;
  padding: 2px 10px;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 1px;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  color: var(--color-primary);
  border: 1px solid var(--color-primary-border);
  font-family: var(--font-mono);
}

/* ─── 学生管理表格 ────────────────────────────────────────── */
.text-center {
  text-align: center;
}

.btn-xs {
  padding: 2px 8px;
  font-size: var(--text-xs);
  min-height: 26px;
  line-height: 1.4;
}

.class-create-form {
  display: grid;
  grid-template-columns: minmax(140px, 180px) minmax(140px, 180px) 96px auto;
  gap: var(--space-2);
  align-items: center;
  max-width: 620px;
}

.class-detail-head {
  position: sticky;
  top: 0;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6);
}

.class-detail-head h1 {
  margin-bottom: var(--space-1);
}

.class-head-actions {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.class-submit-qr {
  position: absolute;
  z-index: 20;
  top: calc(100% + var(--space-2));
  right: 0;
  width: 244px;
  padding: var(--space-3);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow-lg);
}

.class-submit-qr img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.class-submit-qr input {
  width: 100%;
  margin-top: var(--space-2);
  padding: 6px 8px;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-sm);
  color: var(--color-neutral-600);
  font-size: var(--text-xs);
}

.task-class-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.task-class-head h2 {
  margin: 0;
}

.task-submit-entry {
  display: flex;
  flex: 0 1 620px;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-2);
  margin-left: auto;
  min-width: 0;
}

.task-submit-toggle {
  align-self: flex-end;
  white-space: nowrap;
}

.task-submit-qr-img {
  width: 72px;
  height: 72px;
  padding: 4px;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: #fff;
}

.task-submit-qr-link {
  display: block;
  line-height: 0;
  border-radius: var(--radius-md);
}

.task-submit-qr-link:hover .task-submit-qr-img {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.task-submit-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  justify-items: end;
  width: 100%;
  gap: var(--space-2);
  min-width: 0;
}

.task-submit-share {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: var(--space-3) var(--space-4);
  width: min(100%, 620px);
  max-width: 620px;
  padding: var(--space-3);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  background: var(--color-neutral-50);
}

.task-submit-share[hidden] {
  display: none;
}

.task-submit-url {
  display: block;
  width: 100%;
  max-width: 100%;
  padding: 6px 10px;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-sm);
  background: #fff;
  overflow-wrap: anywhere;
  color: var(--color-primary);
  font-size: var(--text-xs);
  line-height: 1.5;
  text-align: left;
}

.task-submit-actions .btn {
  min-width: 92px;
}

.meta-line {
  display: flex;
  gap: var(--space-3);
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
}

.actions-cell {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.form-input-sm {
  min-height: 30px;
  padding: 4px 8px;
  font-size: var(--text-sm);
}

.student-table th,
.student-table td {
  padding: var(--space-2) var(--space-3);
}

/* 学生名册：给数据行和表头补实心背景，避免滚动时行文字从 sticky 表头/上方卡片的缝里透出 */
.student-table {
  border-collapse: separate;
  border-spacing: 0;
}
.student-table tbody td {
  background: #fff;
}
.student-table thead th {
  background: #f8fafc;
  position: sticky;
  top: 0;
  z-index: 5;
}
.student-table tbody tr:hover td {
  background: var(--color-neutral-50);
}

.section-head-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.section-head-row h2 {
  margin: 0;
}

.student-import-panel {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-neutral-200);
}

.student-import-grid {
  display: grid;
  grid-template-columns: minmax(220px, 0.85fr) minmax(0, 1.15fr);
  gap: var(--space-4);
  align-items: stretch;
  margin-bottom: var(--space-3);
}

.student-import-drop {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 150px;
  padding: var(--space-5);
  border: 1.5px dashed var(--color-neutral-300);
  border-radius: var(--radius-lg);
  background: var(--color-neutral-50);
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}

.student-import-drop:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.06);
}

.student-import-drop input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.student-import-title {
  font-weight: var(--font-semibold);
  color: var(--color-neutral-800);
  margin-bottom: var(--space-2);
}

.student-import-sub {
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

.student-import-text {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.student-import-text textarea {
  min-height: 108px;
}

.student-import-submit {
  min-height: 42px;
  min-width: 160px;
}

.student-table tbody tr:hover {
  background: var(--color-neutral-50);
}

.student-name-link {
  color: var(--color-primary);
  text-decoration: none;
  cursor: pointer;
  border-bottom: 1px dashed var(--color-primary-border);
}

.student-name-link:hover {
  color: var(--color-primary-hover);
  border-bottom-style: solid;
}

.student-name-cell {
  min-width: 180px;
}

.student-name-text {
  display: inline-block;
  min-width: 4em;
}

.student-rename-panel {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: var(--space-3);
}

.student-rename-panel[hidden] {
  display: none;
}

[data-theme="dark"] .student-table tbody tr:hover {
  background: var(--color-neutral-800);
}

@media (max-width: 720px) {
  .class-create-form {
    grid-template-columns: 1fr 1fr;
  }

  .class-create-form button {
    grid-column: 1 / -1;
  }

  .class-detail-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .class-head-actions {
    justify-content: flex-start;
  }

  .class-submit-qr {
    left: 0;
    right: auto;
  }

  .task-class-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .task-submit-entry {
    width: 100%;
    flex-basis: auto;
    align-items: stretch;
  }

  .task-submit-actions {
    grid-template-columns: minmax(0, 1fr);
  }

  .task-submit-share {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: flex-start;
    width: 100%;
    max-width: none;
  }

  .task-submit-toggle {
    align-self: stretch;
  }

  .task-submit-url {
    text-align: left;
  }

  .student-rename-panel {
    display: flex;
    margin-left: 0;
    margin-top: var(--space-2);
  }

  .student-import-grid {
    grid-template-columns: 1fr;
  }

  .student-import-submit {
    width: 100%;
  }
}

[data-theme="dark"] .student-name-link {
  color: var(--color-primary-light);
  border-bottom-color: var(--color-primary);
}

/* ─── 可编辑班级名称 ────────────────────────────────────── */
.class-name-edit {
  color: inherit;
  text-decoration: none;
  cursor: pointer;
  border-bottom: 1px dashed transparent;
}

.class-name-edit:hover {
  border-bottom-color: var(--color-neutral-400);
}

.class-name-edit:hover + .edit-icon,
.edit-icon:hover {
  color: var(--color-primary);
  cursor: pointer;
}

.edit-icon {
  display: inline;
  vertical-align: middle;
  margin-left: 2px;
  color: var(--color-neutral-400);
  transition: color 0.15s;
}

h1:hover .edit-icon {
  color: var(--color-primary);
}

/* Resource library */
.resource-bank {
  display: flex;
  flex-direction: column;
  max-width: 1120px;
  margin: 0 auto;
  gap: 0;
  color: #111827;
}

.resource-hero {
  display: block;
  position: sticky;
  top: 0;
  z-index: 90;
  margin: 0 -12px 18px;
  padding: 8px 12px 12px;
  border-bottom: 1px solid #e5e7eb;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 22px rgba(17, 24, 39, 0.04);
  transition: padding 0.18s ease, box-shadow 0.18s ease;
}

.resource-hero .hero-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 12px;
  transition: margin-bottom 0.18s ease;
}

.resource-hero .hero-left {
  min-width: 0;
}

.resource-hero h1 {
  margin: 0 0 6px;
  color: #111827;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.25;
  transition: font-size 0.18s ease;
}

.resource-hero p {
  max-width: 620px;
  margin: 0;
  color: #6b7280;
  font-size: 14px;
  transition: opacity 0.18s ease, max-height 0.18s ease;
}

.resource-bank--compact .resource-hero {
  padding-top: 8px;
  padding-bottom: 12px;
  box-shadow: 0 10px 24px rgba(17, 24, 39, 0.08);
}

.resource-bank--compact .resource-hero .hero-row {
  align-items: flex-end;
  margin-bottom: 12px;
}

.resource-bank--compact .resource-hero h1 {
  font-size: 24px;
  margin-bottom: 6px;
}

.resource-bank--compact .resource-hero p {
  max-height: none;
  opacity: 1;
  overflow: visible;
}

.resource-bank--compact .new-template-btn {
  min-height: 38px;
  padding: 9px 18px;
  font-size: 14px;
}

.resource-bank--compact .resource-search {
  margin-bottom: 10px;
}

.resource-bank--compact .resource-search input,
.resource-bank--compact .search-input,
.resource-bank--compact .sort-select {
  min-height: 44px;
}

.resource-bank--compact .resource-tabs {
  margin-bottom: 10px;
}

.resource-bank--compact .resource-tabs a {
  padding-top: 10px;
  padding-bottom: 10px;
}

.resource-bank--compact .chips-row {
  margin-bottom: 8px;
}

.resource-bank--compact .filter-item {
  padding-top: 7px;
  padding-bottom: 7px;
}

.resource-bank .new-template-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 9px 18px;
  border: 0;
  border-radius: 8px;
  background: #4f46e5;
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 1px 3px rgba(17, 24, 39, 0.05);
  transition: background 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}

.resource-bank .new-template-btn:hover {
  background: #4338ca;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
  transform: translateY(-1px);
}

.resource-tabs {
  display: flex;
  gap: 2px;
  width: 100%;
  padding: 0;
  border: 0;
  border-bottom: 1px solid #e5e7eb;
  border-radius: 0;
  background: transparent;
  margin-bottom: 10px;
}

.resource-tabs a {
  min-width: 0;
  margin-right: 24px;
  padding: 10px 4px;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  color: #6b7280;
  font-size: 15px;
  font-weight: 500;
  text-align: left;
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease;
  position: relative;
  bottom: -1px;
}

.resource-tabs a.active {
  background: transparent;
  color: #4f46e5;
  border-bottom-color: #4f46e5;
  box-shadow: none;
  font-weight: 600;
}

.resource-search {
  display: flex;
  gap: 10px;
  margin-bottom: 10px;
}

.resource-bank .search-wrap {
  flex: 1;
  position: relative;
}

.resource-bank .search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: #9ca3af;
  pointer-events: none;
  font-size: 18px;
}

.resource-search input,
.resource-bank .search-input {
  width: 100%;
  min-height: 44px;
  padding: 0 16px 0 42px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
  color: #111827;
  font-family: inherit;
  font-size: 14px;
  box-shadow: 0 1px 2px rgba(17, 24, 39, 0.04);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.resource-search input:focus {
  border-color: #4f46e5;
  outline: none;
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.resource-bank .sort-select {
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
  color: #374151;
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 1px 2px rgba(17, 24, 39, 0.04);
  cursor: pointer;
}

.resource-field-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.resource-field-head + textarea {
  margin-bottom: var(--space-4);
}

.resource-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.filter-group-title {
  margin-right: 4px;
  color: #9ca3af;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

.bank-filter-row,
.resource-bank .chips-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 8px;
  padding-bottom: 0;
}

.resource-bank .scope-chips {
  margin-bottom: 8px;
}

.resource-bank .chips-label {
  margin-right: 4px;
  color: #9ca3af;
  font-size: 13px;
  font-weight: 600;
}

.resource-bank .filter-item {
  display: flex;
  align-items: center;
  gap: 5px;
  min-height: 0;
  padding: 6px 13px;
  border: 1px solid #e5e7eb;
  border-radius: 999px;
  background: #fff;
  color: #374151;
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.resource-bank .filter-item:hover {
  border-color: #d1d5db;
  background: #f9fafb;
}

.resource-bank .filter-item.active {
  border-color: #4f46e5;
  background: #eef2ff;
  color: #4f46e5;
}

.resource-bank .filter-item .count {
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  border-radius: 999px;
  background: #f3f4f6;
  color: #6b7280;
  font-size: 12px;
  font-weight: 600;
  text-align: center;
  line-height: 20px;
}

.resource-bank .filter-item.active .count {
  background: #fff;
  color: #4f46e5;
}

.bank-result-count {
  margin-left: auto;
  color: #6b7280;
  font-size: 14px;
}

.bank-result-count strong {
  color: #111827;
  font-weight: 600;
}

.bank-main {
  min-width: 0;
}

.bank-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
  padding-bottom: 48px;
}

.bank-card {
  display: flex;
  min-height: 0;
  flex-direction: column;
  gap: 10px;
  padding: 18px;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  background: #fff;
  box-shadow: none;
  cursor: pointer;
  position: relative;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.bank-card:hover {
  border-color: #4f46e5;
  box-shadow: 0 4px 16px rgba(17, 24, 39, 0.08), 0 2px 8px rgba(17, 24, 39, 0.04);
  transform: translateY(-2px);
}

.bank-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-bottom: 0;
}

.bank-card-head {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 0;
}

.bank-card-title-area {
  min-width: 0;
  flex: 1;
}

.bank-card-icon {
  display: inline-flex;
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: #f3f4f6;
  color: #6b7280;
  font-size: 16px;
  font-weight: 700;
}

.bank-card-icon.narrative {
  background: #ecfdf5;
  color: #047857;
}

.bank-card-icon.creative {
  background: #fffbeb;
  color: #b45309;
}

.bank-card-icon.logic {
  background: #fff1f2;
  color: #be123c;
}

.bank-card-icon.structure {
  background: #eef2ff;
  color: #4f46e5;
}

.bank-card-icon.language {
  background: #f0f9ff;
  color: #0369a1;
}

.bank-card-icon.material {
  background: var(--color-warning-light);
  color: var(--color-warning);
}

.bank-card-icon.general {
  background: #f3f4f6;
  color: #6b7280;
}

.bank-badge,
.bank-tag {
  display: inline-flex;
  align-items: center;
  min-height: 22px;
  padding: 2px 8px;
  border-radius: 6px;
  background: #f3f4f6;
  color: #6b7280;
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
}

.bank-badge-primary {
  background: #eef2ff;
  color: #4f46e5;
}

.bank-card-title {
  display: -webkit-box;
  overflow: hidden;
  margin: 0;
  color: #111827;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.35;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 1;
}

.bank-card-template .bank-card-title {
  margin-bottom: 0;
}

.bank-card-excerpt {
  display: -webkit-box;
  overflow: hidden;
  min-height: 40px;
  margin: 0;
  color: #6b7280;
  font-size: 13px;
  line-height: 1.55;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.prompt-image-strip {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 7;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #f9fafb;
}

.prompt-image-strip img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.prompt-image-count {
  position: absolute;
  right: 8px;
  bottom: 8px;
  padding: 2px 7px;
  border-radius: 999px;
  background: rgba(17, 24, 39, 0.72);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
}

.prompt-image-gallery {
  display: grid;
  gap: 12px;
  margin-bottom: 12px;
}

.prompt-image-figure {
  overflow: hidden;
  margin: 0;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
}

.prompt-image-figure img {
  display: block;
  width: 100%;
  max-height: 360px;
  object-fit: contain;
  background: #f9fafb;
}

.prompt-image-figure figcaption {
  padding: 8px 10px;
  border-top: 1px solid #e5e7eb;
  color: #6b7280;
  font-size: 12px;
  line-height: 1.5;
}

.resource-bank .prompt-preview {
  display: -webkit-box;
  overflow: hidden;
  padding: 10px 12px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #f9fafb;
  color: #6b7280;
  font-family: Consolas, "Microsoft YaHei", monospace;
  font-size: 12px;
  line-height: 1.5;
  white-space: normal;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.bank-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: auto;
  padding-top: 4px;
  border-top: 0;
}

.resource-bank .card-meta {
  display: flex;
  gap: 12px;
  color: #9ca3af;
  font-size: 12px;
}

.resource-bank .card-actions {
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.bank-card:hover .card-actions,
.resource-modal-foot .card-actions {
  opacity: 1;
}

.resource-bank .card-actions form,
.resource-bank .modal-foot-right form {
  display: inline-flex;
}

.resource-bank .card-action {
  display: inline-flex;
  width: 28px;
  height: 28px;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 6px;
  background: #f9fafb;
  color: #9ca3af;
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease;
}

.resource-bank .card-action:hover {
  background: #f3f4f6;
  color: #374151;
}

.resource-create,
.resource-edit {
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
}

.resource-create {
  margin-bottom: 16px;
}

.resource-create > summary,
.resource-edit > summary {
  cursor: pointer;
  color: var(--color-neutral-700);
  font-weight: var(--font-semibold);
  list-style: none;
}

.resource-create > summary {
  padding: 12px 16px;
}

.resource-edit {
  margin-top: var(--space-4);
  background: var(--color-neutral-50);
}

.resource-edit > summary {
  padding: var(--space-2) var(--space-3);
  color: var(--color-primary);
  font-size: var(--text-sm);
}

.resource-create > summary::-webkit-details-marker,
.resource-edit > summary::-webkit-details-marker {
  display: none;
}

.resource-create > summary::after,
.resource-edit > summary::after {
  content: "+";
  float: right;
  color: var(--color-neutral-400);
}

.resource-create[open] > summary::after,
.resource-edit[open] > summary::after {
  content: "-";
}

.resource-create form,
.resource-edit form {
  padding: 0 16px 16px;
}

.resource-add-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(260px, 0.8fr);
  gap: var(--space-4);
  align-items: stretch;
}

.resource-add-card {
  display: flex;
  flex-direction: column;
  min-height: 244px;
  margin-bottom: 0;
  padding: 14px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
}

.resource-add-card textarea {
  flex: 1;
  min-height: 170px;
  height: 100%;
  resize: vertical;
}

.resource-add-card--qr {
  justify-content: center;
  background: #f9fafb;
}

.resource-add-card.form-group {
  gap: 0;
}

.prompt-quick-fields {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.prompt-mobile-card {
  display: grid;
  gap: 8px;
  justify-items: center;
  padding: 0;
}

.prompt-mobile-card-text {
  display: grid;
  gap: 4px;
}

.prompt-mobile-card-text strong {
  color: #111827;
  font-size: 15px;
}

.prompt-mobile-card-text span {
  color: #6b7280;
  font-size: 12px;
  line-height: 1.5;
}

.prompt-mobile-qr {
  display: inline-flex;
  padding: 8px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
}

.prompt-mobile-qr img {
  width: 112px;
  height: 112px;
  display: block;
}

.prompt-mobile-page {
  min-height: 100vh;
  background: #f3f4f6;
}

.prompt-mobile-shell {
  width: min(100%, 520px);
  margin: 0 auto;
  padding: 18px 14px 32px;
}

.prompt-mobile-panel {
  display: grid;
  gap: 14px;
  padding: 18px;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 8px 24px rgba(17, 24, 39, 0.08);
}

.prompt-mobile-panel h1 {
  margin: 0;
  color: #111827;
  font-size: 22px;
}

.prompt-mobile-form {
  display: grid;
  gap: 14px;
}

.prompt-mobile-form input[type="file"] {
  width: 100%;
  padding: 18px;
  border: 1px dashed #c7d2fe;
  border-radius: 8px;
  background: #eef2ff;
}

.resource-edit form {
  padding: 0 var(--space-3) var(--space-3);
}

.resource-edit textarea {
  min-height: 120px;
}

.template-preview-block {
  margin: 0;
  padding: 14px 16px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #f9fafb;
  color: #374151;
  font-family: Consolas, "Microsoft YaHei", monospace;
  font-size: 13px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
}

.modal-open {
  overflow: hidden;
}

.resource-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(17, 24, 39, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.resource-modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.resource-modal {
  display: flex;
  width: min(920px, calc(100vw - 48px));
  max-height: 90vh;
  flex-direction: column;
  overflow: hidden;
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 16px 48px rgba(17, 24, 39, 0.14), 0 8px 24px rgba(17, 24, 39, 0.08);
  transform: scale(0.96);
  transition: transform 0.2s ease;
}

.resource-modal--full {
  width: min(1240px, calc(100vw - 32px));
  max-height: calc(100vh - 32px);
}

.resource-modal-overlay.open .resource-modal {
  transform: translateY(0) scale(1);
}

.resource-modal-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 22px 32px 18px;
  border-bottom: 1px solid #e5e7eb;
}

.resource-modal-head h2 {
  margin: 4px 0 0;
  color: #111827;
  font-size: 21px;
  font-weight: 700;
  line-height: 1.45;
}

.resource-modal-title-area {
  min-width: 0;
  flex: 1;
}

.resource-modal-close {
  display: inline-flex;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 6px;
  background: #f9fafb;
  color: #9ca3af;
  cursor: pointer;
  font-size: var(--text-xl);
  line-height: 1;
}

.resource-modal-close:hover {
  background: #f3f4f6;
  color: #374151;
}

.resource-modal-body {
  flex: 1;
  max-height: none;
  overflow-y: auto;
  padding: 26px 32px 30px;
  color: #1f2937;
  font-size: 17px;
  line-height: 1.85;
}

.resource-modal-body .template-preview-block {
  margin: 0;
  padding: 20px 22px;
  border-color: #edf0f4;
  background: #fbfcfe;
  color: #1f2937;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.85;
  word-break: normal;
  overflow-wrap: anywhere;
}

.resource-modal--full .resource-modal-body {
  padding: 30px 44px 36px;
}

.resource-modal--full .template-preview-block {
  max-width: 920px;
  margin-right: auto;
  margin-left: auto;
}

.resource-modal-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 32px;
  border-top: 1px solid #e5e7eb;
  background: #fff;
}

.resource-modal-next {
  min-width: 72px;
}

.resource-modal-next::after {
  content: " →";
}

.resource-bank .modal-section-title {
  margin: 0 0 12px;
  color: #9ca3af;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.resource-bank .results-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.resource-bank .results-count {
  color: #6b7280;
  font-size: 14px;
}

.resource-bank .results-count strong {
  color: #111827;
  font-weight: 600;
}

.resource-bank .results-count span {
  margin-left: 8px;
  color: #9ca3af;
  font-size: 13px;
}

.resource-pagination {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  flex-wrap: wrap;
}

.resource-pagination .pager-btn,
.resource-pagination .pager-ellipsis {
  min-width: 30px;
  height: 30px;
  padding: 0 9px;
  border: 1px solid #e5e7eb;
  border-radius: 6px;
  background: #fff;
  color: #374151;
  font-size: 13px;
  font-weight: 600;
  line-height: 28px;
  text-align: center;
  text-decoration: none;
}

.resource-pagination .pager-btn:hover {
  border-color: #d1d5db;
  background: #f9fafb;
}

.resource-pagination .pager-btn.active {
  border-color: #4f46e5;
  background: #4f46e5;
  color: #fff;
}

.resource-pagination .pager-ellipsis {
  border-color: transparent;
  background: transparent;
  color: #9ca3af;
}

.resource-bank .btn-sm {
  min-height: 28px;
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 12px;
}

.resource-bank .btn-primary {
  background: #4f46e5;
  border-color: #4f46e5;
}

.resource-bank .btn-primary:hover {
  background: #4338ca;
  border-color: #4338ca;
}

.public-prompt-page {
  position: relative;
  width: min(1280px, 100%);
  padding: 0 0 48px;
}

.public-prompt-hero {
  display: grid;
  gap: 12px;
  padding: 4px 0 14px;
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(250, 250, 249, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(229, 231, 235, 0.8);
}

.public-prompt-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 36px;
}

.public-prompt-brand,
.public-prompt-login {
  color: #374151;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.public-prompt-top-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.public-prompt-share,
.public-prompt-login {
  padding: 7px 12px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
  color: #4f46e5;
}

.public-prompt-share {
  appearance: none;
  color: #475569;
  cursor: pointer;
  font: inherit;
}

.public-prompt-share:hover,
.public-prompt-login:hover {
  border-color: #c7d2fe;
  background: #f8fafc;
}

.public-prompt-headline {
  display: grid;
  gap: 0;
}

.public-prompt-headline h1 {
  margin: 0;
  color: #111827;
  font-size: 30px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0;
}

.public-prompt-headline p {
  max-width: 720px;
  margin: 0;
  color: #6b7280;
  font-size: 15px;
  line-height: 1.6;
}

.public-prompt-search {
  display: flex;
  gap: 10px;
  align-items: stretch;
}

.public-prompt-search .search-wrap {
  flex: 1;
}

.public-prompt-search .btn {
  min-width: 88px;
  border-radius: 8px;
}

.public-stage-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 38px;
  padding-right: 28px;
}

.public-stage-tab {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 148px;
  min-height: 34px;
  padding: 0 14px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
  color: #374151;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.public-stage-tab span {
  color: #9ca3af;
  font-size: 11px;
  font-weight: 700;
}

.public-stage-tab.active {
  border-color: #4f46e5;
  background: #eef2ff;
  color: #4f46e5;
}

.public-prompt-filters {
  margin-bottom: 16px;
  display: none;
}

.public-prompt-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  align-items: start;
  gap: 28px;
}

.public-prompt-sidebar {
  position: sticky;
  top: 188px;
  width: 260px;
  max-height: calc(100vh - 204px);
  padding-right: 4px;
  overflow-y: auto;
  display: grid;
  gap: 14px;
  scrollbar-width: thin;
}

.public-filter-group {
  display: grid;
  gap: 10px;
  padding: 14px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
}

.public-filter-form {
  display: grid;
  gap: 12px;
}

.public-filter-group h2 {
  margin: 0;
  color: #111827;
  font-size: 14px;
  font-weight: 800;
}

.public-filter-group select {
  width: 100%;
  min-height: 38px;
  padding: 0 10px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
  color: #374151;
  font: inherit;
  font-size: 13px;
}

.public-filter-group select:disabled {
  background: #f9fafb;
  color: #9ca3af;
}

.public-filter-group .chips-row {
  margin: 0;
  gap: 7px;
}

.public-year-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.public-year-check {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 30px;
  padding: 4px 8px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
  color: #374151;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
}

.public-year-check input {
  margin: 0;
}

.public-filter-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.public-filter-actions .btn {
  min-height: 38px;
  padding: 0 10px;
  border-radius: 8px;
  font-size: 13px;
}

.public-filter-panel {
  display: grid;
  gap: 12px;
  padding: 0 12px 12px;
}

.public-filter-details {
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
  display: none;
}

.public-filter-details summary {
  padding: 10px 14px;
  color: #374151;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  list-style: none;
}

.public-filter-details summary::-webkit-details-marker {
  display: none;
}

.public-filter-details .chips-row {
  margin: 0;
}

.public-prompt-grid {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.public-prompt-card {
  min-height: 184px;
  padding: 0;
}

.public-prompt-card-link {
  display: flex;
  min-height: 184px;
  flex-direction: column;
  gap: 10px;
  padding: 18px;
  color: inherit;
  text-decoration: none;
  border-radius: inherit;
}

.public-prompt-empty {
  grid-column: 1 / -1;
}

.public-prompt-detail {
  max-width: 980px;
}

.public-detail-shell {
  display: grid;
  gap: 18px;
  padding-bottom: 56px;
}

.public-detail-head {
  display: grid;
  gap: 12px;
  padding: 22px;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  background: #fff;
}

.public-detail-head h1 {
  margin: 0;
  color: #111827;
  font-size: 30px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: 0;
}

.public-detail-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.public-detail-title-row h1 {
  flex: 1 1 auto;
}

.public-detail-next {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 7px 13px;
  border: 1px solid #dbe3ef;
  border-radius: 8px;
  background: #fff;
  color: #4f46e5;
  font-size: 14px;
  font-weight: 800;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
}

.public-detail-next:hover {
  border-color: #c7d2fe;
  background: #f8fafc;
  color: #4338ca;
}

.public-detail-head p {
  margin: 0;
  color: #6b7280;
  font-size: 14px;
}

.public-detail-tags {
  margin: 0;
  padding-top: 2px;
}

.public-detail-tags .bank-tag {
  background: #f8fafc;
  color: #64748b;
}

.public-detail-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.public-detail-section {
  display: grid;
  gap: 10px;
}

.public-detail-section h2 {
  margin: 0;
  color: #111827;
  font-size: 18px;
  font-weight: 800;
}

.public-prompt-detail .template-preview-block {
  background: #fff;
  color: #1f2937;
  padding: 22px 24px;
  font-size: 18px;
  line-height: 1.9;
  letter-spacing: 0;
}

.public-prompt-detail .template-preview-block p {
  margin: 0 0 0.9em;
}

.public-prompt-detail .template-preview-block p:last-child {
  margin-bottom: 0;
}

.public-download-nudge {
  position: fixed;
  inset: 0;
  z-index: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(17, 24, 39, 0.42);
}

.public-download-nudge[hidden] {
  display: none;
}

.public-download-card {
  display: grid;
  gap: 12px;
  width: min(420px, 100%);
  padding: 20px;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 18px 50px rgba(17, 24, 39, 0.18);
}

.public-download-card h2 {
  margin: 0;
  color: #111827;
  font-size: 20px;
}

.public-download-card p {
  margin: 0;
  color: #6b7280;
  font-size: 14px;
  line-height: 1.65;
}

.public-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.public-share-btn {
  min-height: 38px;
  padding: 0 14px;
  border: 0;
  border-radius: 8px;
  background: #4f46e5;
  color: #fff;
  cursor: pointer;
  font-size: 13px;
  font-weight: 800;
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.18), 0 2px 6px rgba(17, 24, 39, 0.08);
  white-space: nowrap;
}

.public-share-btn:hover {
  background: #4338ca;
  transform: translateY(-1px);
}

@media (max-width: 1120px) {
  .public-prompt-layout {
    display: block;
  }

  .public-prompt-sidebar {
    display: none;
  }

  .public-prompt-filters {
    display: block;
  }

  .public-filter-details {
    display: block;
  }
}

@media (max-width: 860px) {
  .resource-hero {
    top: 0;
    margin: 0 -10px 14px;
    padding: 8px 10px 10px;
  }

  .resource-hero .hero-row {
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
  }

  .resource-bank--compact .resource-hero .hero-row {
    max-height: none;
    margin-bottom: 10px;
    opacity: 1;
    overflow: visible;
  }

  .resource-hero h1 {
    font-size: 20px;
    margin-bottom: 0;
  }

  .resource-hero p {
    display: none;
  }

  .resource-bank .new-template-btn {
    min-height: 32px;
    padding: 7px 12px;
    font-size: 13px;
  }

  .resource-search {
    gap: 8px;
    margin-bottom: 8px;
  }

  .resource-search input,
  .resource-bank .search-input,
  .resource-bank .sort-select {
    min-height: 38px;
  }

  .resource-tabs {
    margin-bottom: 8px;
    overflow-x: auto;
  }

  .resource-tabs a {
    margin-right: 16px;
    padding: 8px 2px;
    font-size: 14px;
    white-space: nowrap;
  }

  .resource-bank .chips-row {
    flex-wrap: nowrap;
    margin-bottom: 6px;
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: none;
  }

  .resource-bank .chips-row::-webkit-scrollbar {
    display: none;
  }

  .resource-bank .chips-label {
    flex: 0 0 auto;
  }

  .resource-bank .filter-item {
    flex: 0 0 auto;
    padding: 5px 11px;
    font-size: 12px;
  }

  .resource-bank .results-bar {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .resource-pagination {
    justify-content: flex-start;
  }

  .filter-group-title {
    width: 100%;
  }

  .bank-result-count {
    width: 100%;
    margin-left: 0;
  }

  .resource-add-grid {
    grid-template-columns: 1fr;
  }

  .prompt-quick-fields {
    grid-template-columns: 1fr;
  }

  .resource-modal-overlay {
    padding: var(--space-3);
  }

  .resource-modal,
  .resource-modal--full {
    width: 100%;
    max-height: calc(100vh - var(--space-6));
    border-radius: 14px;
  }

  .resource-modal-head,
  .resource-modal-body,
  .resource-modal-foot {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  .resource-modal-head h2 {
    font-size: 18px;
  }

  .resource-modal-body,
  .resource-modal-body .template-preview-block {
    font-size: 16px;
    line-height: 1.8;
  }

  .resource-modal-body .template-preview-block {
    padding: var(--space-4);
  }

  .public-prompt-page {
    padding-bottom: 32px;
  }

  .public-prompt-headline h1 {
    font-size: 26px;
  }

  .public-prompt-headline p {
    font-size: 14px;
  }

  .public-prompt-search {
    flex-direction: column;
  }

  .public-prompt-search .btn {
    width: 100%;
    min-height: 42px;
  }

  .public-filter-details:not([open]) {
    margin-bottom: 8px;
  }

  .public-prompt-layout {
    display: block;
  }

  .public-prompt-sidebar {
    display: none;
  }

  .public-filter-details {
    display: block;
  }

  .public-filter-panel {
    padding: 0 10px 10px;
  }

  .public-filter-group {
    padding: 12px;
  }

  .public-prompt-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .public-prompt-card {
    min-height: 164px;
    border-radius: 8px;
  }

  .public-prompt-card-link {
    min-height: 164px;
    padding: 15px;
  }

  .public-prompt-detail .public-prompt-topbar {
    padding: 0 2px;
  }

  .public-detail-head {
    padding: 16px;
    border-radius: 8px;
  }

  .public-detail-head h1 {
    font-size: 24px;
  }

  .public-detail-title-row {
    flex-direction: column;
    align-items: stretch;
  }

  .public-detail-next {
    align-self: flex-end;
  }

  .public-detail-actions .btn {
    width: 100%;
  }

  .public-prompt-detail .template-preview-block {
    padding: 18px;
    font-size: 17px;
    line-height: 1.88;
  }

  .public-section-head {
    align-items: stretch;
    flex-direction: column;
  }

  .public-share-btn {
    width: 100%;
    min-height: 40px;
    padding: 0 16px;
  }
}

.template-grid {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.template-card {
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
}

.template-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.template-card-head h2 {
  margin: 0 0 var(--space-2);
}

.template-field-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.grading-review-rule-textarea {
  min-height: 360px;
  resize: vertical;
  font-size: var(--text-sm);
  line-height: 1.7;
}

.template-field-stack label {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  color: var(--color-neutral-700);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
}

.template-field-stack textarea,
.template-card textarea {
  min-height: 74px;
}

.review-tags {
  margin: var(--space-3) 0;
}

.review-tags strong {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--color-neutral-700);
  font-size: var(--text-sm);
}

.review-tags > div {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag--success {
  background: var(--color-success-light);
  color: var(--color-success-dark);
}

.archive-hero {
  margin-bottom: var(--space-4);
}

.archive-class-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.archive-class-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
}

.archive-class-head h2 {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0 0 var(--space-1);
}

.archive-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-3);
}

.archive-stats span {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  min-height: 42px;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
  color: var(--color-neutral-600);
  font-size: var(--text-sm);
}

.archive-stats strong {
  color: var(--color-neutral-900);
  font-size: var(--text-lg);
}

@media (max-width: 760px) {
  .archive-class-head {
    flex-direction: column;
  }

  .archive-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.task-design-layout {
  display: grid;
  grid-template-columns: minmax(0, 1180px) 340px;
  gap: var(--space-4);
  align-items: start;
  width: calc(100vw - 280px - var(--space-6) * 2);
  max-width: 1540px;
}

.task-design-layout > .card {
  min-width: 0;
  margin: 0;
}

.task-designer-panel {
  position: sticky;
  top: var(--space-4);
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - var(--space-5) * 2);
  min-height: 520px;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.task-designer-head {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-neutral-200);
}

.task-designer-head h2 {
  margin: 0 0 var(--space-1);
  font-size: var(--text-base);
}

.task-designer-chat {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: var(--space-2);
  min-height: 120px;
  padding: var(--space-3);
  overflow-y: auto;
  background: var(--color-neutral-50);
}

.task-designer-message {
  max-width: 94%;
  padding: 8px 10px;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: #fff;
  color: var(--color-neutral-700);
  font-size: var(--text-xs);
  line-height: 1.55;
  white-space: pre-wrap;
}

.task-designer-message--user {
  align-self: flex-end;
  border-color: var(--color-primary-light);
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.task-designer-input {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-3) var(--space-2);
  border-top: 1px solid var(--color-neutral-200);
  background: #fff;
}

.task-designer-input textarea {
  min-height: 72px;
  resize: vertical;
  font-size: var(--text-sm);
}

.task-designer-input button {
  min-height: 44px;
  white-space: nowrap;
}

.task-designer-result {
  display: grid;
  gap: var(--space-2);
  max-height: none;
  padding: var(--space-3);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  background: #fff;
}

.task-designer-result[hidden] {
  display: none;
}

.task-designer-result-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
}

.task-designer-title-preview {
  padding: 10px 12px;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
  color: var(--color-neutral-900);
  font-weight: var(--font-semibold);
  line-height: 1.45;
}

.task-designer-preview-grid {
  display: grid;
  gap: var(--space-2);
}

.task-designer-preview-grid section {
  padding: 10px 12px;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: #fff;
}

.task-designer-preview-grid span {
  display: block;
  margin-bottom: 4px;
  color: var(--color-neutral-500);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
}

.task-designer-preview-grid p {
  margin: 0;
  color: var(--color-neutral-700);
  font-size: var(--text-sm);
  line-height: 1.55;
  white-space: pre-wrap;
}

.task-designer-apply-bar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-2);
}

@media (max-width: 980px) {
  .essay-html-review-layout:not(.essay-html-review-layout--focus) .temporary-review-panel {
    position: static;
    width: auto;
    max-height: none;
    margin-top: var(--space-4);
  }

  .task-design-layout {
    grid-template-columns: 1fr;
  }

  .task-designer-panel {
    position: static;
    max-height: none;
  }
}

/* ─── 批量批改弹窗 ─────────────────────────────────────────── */
.batch-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 100;
  align-items: center;
  justify-content: center;
}

.batch-dialog {
  background: #fff;
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  max-width: 440px;
  width: 90%;
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.batch-dialog h3 {
  margin: 0;
  font-size: var(--text-lg);
}

.batch-dialog .muted {
  margin: 0;
}

.batch-dialog .btn { margin-right: var(--space-2); }

.batch-dialog .form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.batch-dialog .form-group span {
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
}

.batch-dialog .form-group textarea {
  min-height: 80px;
}

[data-theme="dark"] .batch-dialog {
  background: var(--color-neutral-800);
}

/* ─── 纸质稿按钮/画廊 ─────────────────────────────────────── */
.paper-check {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: 0 0 var(--space-5);
  padding: var(--space-3);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
}

.paper-check--compact {
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
  padding: var(--space-3) var(--space-4);
}

.paper-check-main {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.paper-check span {
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
}

.paper-check strong {
  color: var(--color-neutral-900);
  font-size: var(--text-sm);
}

.paper-check em {
  margin-left: auto;
  color: var(--color-neutral-500);
  font-size: var(--text-xs);
  font-style: normal;
}

.paper-check-note {
  margin-left: auto;
  white-space: nowrap;
}

.paper-btn {
  margin-left: auto;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-primary-border);
  border-radius: var(--radius-md);
  background: #fff;
  color: var(--color-primary);
  font: inherit;
  font-size: var(--text-sm);
  white-space: nowrap;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.paper-btn:hover {
  background: var(--color-primary-light);
}

.paper-match {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-1) var(--space-3);
  margin: calc(-1 * var(--space-2)) 0 var(--space-5);
  padding: var(--space-3);
  border: 1px solid var(--color-neutral-200);
  border-left: 4px solid var(--color-neutral-300);
  border-radius: var(--radius-md);
  background: #fff;
}

.paper-match strong {
  color: var(--color-neutral-900);
  font-size: var(--text-sm);
}

.paper-match span {
  color: var(--color-neutral-700);
  font-size: var(--text-sm);
}

.paper-match em {
  grid-column: 1 / -1;
  color: var(--color-neutral-600);
  font-size: var(--text-sm);
  font-style: normal;
}

.paper-match ul {
  grid-column: 1 / -1;
  margin: var(--space-1) 0 0;
  padding-left: var(--space-5);
  color: var(--color-neutral-600);
  font-size: var(--text-sm);
}

.paper-match--ok {
  border-left-color: var(--color-success);
}

.paper-match--watch {
  border-left-color: #f59e0b;
  background: #fffbeb;
}

.paper-match--high {
  border-left-color: var(--color-danger);
  background: #fef2f2;
}

.paper-match--unknown {
  border-left-color: var(--color-neutral-300);
  background: var(--color-neutral-50);
}

.paper-gallery {
  margin: var(--space-5) 0 0;
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-neutral-200);
}

.paper-gallery[hidden] {
  display: none;
}

.paper-gallery-head {
  margin-bottom: var(--space-4);
}

.paper-gallery-head h2 {
  margin: 0 0 var(--space-1);
  font-size: var(--text-lg);
}

.paper-gallery-head p {
  margin: 0;
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
  text-indent: 0;
}

.paper-page {
  margin: 0 0 var(--space-5);
}

.paper-page figcaption {
  margin-bottom: var(--space-2);
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
  text-align: center;
}

.paper-gallery-img {
  display: block;
  max-width: 100%;
  margin: 0 auto var(--space-4);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  cursor: zoom-in;
  transition: transform var(--transition-fast);
}

.paper-gallery-img.zoomed {
  cursor: zoom-out;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: 90vw;
  max-height: 90vh;
  width: auto;
  height: auto;
  z-index: 200;
  border-radius: var(--radius-lg);
  box-shadow: 0 0 0 2000px rgba(0,0,0,0.6);
}

[data-theme="dark"] .paper-btn {
  border-color: var(--color-neutral-600);
}

[data-theme="dark"] .paper-check,
[data-theme="dark"] .paper-match,
[data-theme="dark"] .paper-btn {
  background: var(--color-neutral-800);
}

[data-theme="dark"] .paper-gallery-img {
  border-color: var(--color-neutral-600);
}

/* ─── 批注手动编辑/删除 ───────────────────────────────────── */
.real-comment-actions {
  margin-left: auto;
  display: flex;
  gap: var(--space-2);
}

.real-comment-actions a {
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-size: var(--text-sm);
  color: var(--color-neutral-500);
  transition: color var(--transition-fast);
}

.real-comment-actions a:hover {
  color: var(--color-primary);
}

.real-comment.editing .annotation-comment {
  display: none;
}

.real-comment .edit-form {
  display: none;
}

.real-comment.editing {
  overflow: visible !important;
}

.real-comment.editing .edit-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  position: relative;
  z-index: 10;
}

.real-comment .edit-form textarea {
  min-height: 60px;
  font: inherit;
  font-size: var(--text-sm);
  padding: var(--space-2);
  border: 1px solid var(--color-primary-border);
  border-radius: var(--radius-md);
  resize: vertical;
  position: relative;
  z-index: 10;
}

.edit-form-actions {
  display: flex;
  gap: var(--space-1);
  justify-content: flex-end;
}

/* ─── 添加批注表单 ─────────────────────────────────────────── */
.add-annotation {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-neutral-100);
}

.add-annotation-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.add-annotation-form label {
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--color-neutral-500);
}

.add-annotation-form select,
.add-annotation-form input,
.add-annotation-form textarea {
  padding: var(--space-2);
  border: 1px solid var(--color-neutral-300);
  border-radius: var(--radius-md);
  font: inherit;
  font-size: var(--text-sm);
}

.add-annotation-form textarea {
  min-height: 80px;
  resize: vertical;
}

[data-theme="dark"] .add-annotation {
  border-top-color: var(--color-neutral-700);
}

/* ─── 评语面板编辑按钮 ───────────────────────────────────── */
.panel-edit-btn {
  margin-left: var(--space-2);
  font-size: var(--text-xs);
  text-decoration: none;
  color: var(--color-neutral-400);
}

.panel-edit-btn:hover {
  color: var(--color-primary);
}

#essay-score {
  cursor: pointer;
  border-bottom: 1px dashed var(--color-neutral-400);
}

#essay-score:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* ─── 选中原文弹窗批注 ───────────────────────────────────── */
.float-annotate-btn {
  display: none;
  position: absolute;
  z-index: 150;
  padding: 4px 12px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  white-space: nowrap;
  user-select: none;
}

.float-annotate-btn:hover {
  background: var(--color-primary-hover);
}

.float-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
}

.float-annotate-form {
  background: #fff;
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  max-width: 420px;
  width: 90%;
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-height: 90vh;
  overflow-y: auto;
}

.float-annotate-form h4 {
  margin: 0;
  font-size: var(--text-base);
}

.float-annotate-form label {
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--color-neutral-500);
}

.float-annotate-form select,
.float-annotate-form textarea {
  padding: var(--space-2);
  border: 1px solid var(--color-neutral-300);
  border-radius: var(--radius-md);
  font: inherit;
  font-size: var(--text-sm);
}

.float-annotate-form .float-source {
  padding: var(--space-2);
  background: var(--color-neutral-50);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-neutral-600);
  word-break: break-all;
  max-height: 80px;
  overflow-y: auto;
}

.float-annotate-form textarea {
  min-height: 80px;
  resize: vertical;
}

[data-theme="dark"] .float-annotate-form {
  background: var(--color-neutral-800);
}

[data-theme="dark"] .float-annotate-form .float-source {
  background: var(--color-neutral-700);
  border-color: var(--color-neutral-600);
  color: var(--color-neutral-300);
}

/* ─── 任务报告 ─────────────────────────────────────────────── */
.report-page {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.report-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
}

.report-header h1 {
  margin: var(--space-2) 0 var(--space-1);
}

.report-header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.report-stale-alert {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.report-stale-alert p {
  margin: var(--space-1) 0 0;
}

.report-grid {
  display: grid;
  gap: var(--space-3);
}

.report-grid--metrics {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.report-metric {
  padding: var(--space-4);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.report-metric span {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
}

.report-metric strong {
  color: var(--color-neutral-900);
  font-size: var(--text-2xl);
}

.report-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: var(--space-5);
  align-items: start;
}

.report-main,
.report-side {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.report-section {
  padding: var(--space-5);
}

.report-section h2 {
  margin: 0 0 var(--space-4);
  font-size: var(--text-lg);
}

.score-band-list {
  display: grid;
  gap: var(--space-2);
}

.score-band-row {
  display: flex;
  justify-content: space-between;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
}

.score-band-row span {
  color: var(--color-neutral-600);
}

.report-tag-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-3);
}

.report-tag-card {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
}

.report-tag-card strong {
  color: var(--color-neutral-900);
}

.report-tag-card span,
.report-tag-card em {
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
  font-style: normal;
}

.report-note {
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-neutral-100);
}

.report-note:last-child {
  border-bottom: 0;
}

.report-note p {
  margin: var(--space-1) 0 0;
  color: var(--color-neutral-600);
  line-height: var(--leading-relaxed);
}

.report-mini-table {
  width: 100%;
  border-collapse: collapse;
}

.report-mini-table td {
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-neutral-100);
  font-size: var(--text-sm);
}

.report-mini-table td:last-child {
  width: 52px;
  text-align: right;
  color: var(--color-neutral-900);
  font-weight: var(--font-medium);
}

.report-ai-content {
  color: var(--color-neutral-700);
  line-height: var(--leading-relaxed);
}

.report-ai-content h1,
.report-ai-content h2,
.report-ai-content h3 {
  margin: var(--space-4) 0 var(--space-2);
  font-size: var(--text-base);
}

.report-ai-content p,
.report-ai-content ul,
.report-ai-content ol {
  margin-top: 0;
}

.focus-dashboard {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: var(--space-4);
  align-items: start;
}

.focus-main,
.focus-side {
  display: grid;
  gap: var(--space-4);
}

.focus-section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.focus-section-head h2 {
  margin: 0;
}

.focus-section-head span {
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
}

.focus-panel {
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: 8px;
  padding: var(--space-4);
}

.focus-primary {
  border-top: 3px solid var(--color-primary-500);
}

.focus-panel--side {
  padding: var(--space-4);
}

.focus-panel--side h2 {
  margin: 0 0 var(--space-3);
  font-size: var(--text-base);
}

.focus-diagnosis-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.focus-diagnosis-table th,
.focus-diagnosis-table td {
  padding: 10px var(--space-3);
  border-bottom: 1px solid var(--color-neutral-100);
  text-align: left;
  vertical-align: top;
}

.focus-diagnosis-table th {
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
}

.focus-diagnosis-table tbody tr:hover {
  background: #f8fbff;
}

.focus-rank {
  width: 38px;
  color: var(--color-primary-700);
  font-weight: var(--font-semibold);
}

.focus-count {
  white-space: nowrap;
  color: var(--color-danger-600);
  font-weight: var(--font-semibold);
}

.focus-students {
  color: var(--color-neutral-600);
  line-height: 1.6;
}

.focus-evidence summary {
  cursor: pointer;
  color: var(--color-primary-700);
  font-weight: var(--font-semibold);
  white-space: nowrap;
}

.focus-evidence ul {
  display: grid;
  gap: 8px;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.focus-evidence li {
  padding: 8px 0;
  border-top: 1px solid var(--color-neutral-100);
}

.focus-evidence b {
  display: block;
  margin-bottom: 4px;
  color: var(--color-neutral-500);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
}

.focus-evidence blockquote {
  margin: 0;
  padding-left: 10px;
  border-left: 3px solid var(--color-primary-200);
  color: var(--color-neutral-800);
  line-height: 1.55;
}

.focus-example-comment {
  margin: 5px 0 0;
  color: var(--color-neutral-500);
  font-size: var(--text-xs);
  line-height: 1.5;
}

.focus-report-panel {
  max-width: 980px;
  margin: 0 auto;
  padding: var(--space-6);
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: 8px;
}

.workbench-resource-panel {
  max-width: 980px;
  margin: 0 auto var(--space-4);
  padding: 18px 20px;
  background: #fff;
  border: 1px solid var(--color-neutral-200);
  border-radius: 8px;
}

.workbench-resource-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}

.workbench-resource-head h2 {
  margin: 0 0 4px;
  font-size: var(--text-lg);
}

.workbench-resource-head p {
  margin: 0;
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.workbench-resource-queries {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.workbench-resource-queries span {
  max-width: 260px;
  overflow: hidden;
  padding: 4px 9px;
  border: 1px solid var(--color-primary-100);
  border-radius: 999px;
  background: #f5f8ff;
  color: var(--color-primary-700);
  font-size: var(--text-xs);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.workbench-resource-grid {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.workbench-resource-card {
  padding: 12px 14px;
  border: 1px solid var(--color-neutral-100);
  border-radius: 8px;
  background: #fbfcfe;
}

.workbench-resource-card-head,
.workbench-resource-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.workbench-resource-card-head span {
  color: var(--color-neutral-900);
  font-weight: var(--font-semibold);
}

.workbench-resource-card-head em {
  color: var(--color-neutral-400);
  font-size: var(--text-xs);
  font-style: normal;
}

.workbench-resource-card h3 {
  margin: 8px 0 6px;
  color: var(--color-neutral-700);
  font-size: var(--text-sm);
}

.workbench-resource-card p,
.workbench-resource-empty p {
  margin: 0;
  color: var(--color-neutral-600);
  font-size: var(--text-sm);
  line-height: 1.75;
}

.workbench-resource-meta {
  margin-top: 10px;
  color: var(--color-neutral-400);
  font-size: var(--text-xs);
}

.workbench-resource-meta a {
  color: var(--color-primary-600);
}

.workbench-resource-empty {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 8px;
  background: var(--color-neutral-50);
}

.workbench-resource-empty code {
  display: inline-block;
  margin-top: 8px;
  color: var(--color-neutral-500);
  font-size: var(--text-xs);
}

.focus-report-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-neutral-100);
}

.focus-report-head h2 {
  margin: 0 0 6px;
  font-size: var(--text-2xl);
}

.focus-report-head p {
  margin: 0;
  color: var(--color-neutral-500);
}

.focus-problem-report h2 {
  display: none;
}

.focus-problem-report {
  display: grid;
  gap: var(--space-5);
}

.focus-problem-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-neutral-200);
  border-radius: 8px;
  background: linear-gradient(180deg, #fff 0%, #fbfcff 100%);
}

.focus-problem-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: var(--color-primary-500);
}

.focus-problem-card h3 {
  margin: 0;
  padding: 18px 22px 14px 26px;
  color: var(--color-neutral-950);
  font-size: var(--text-xl);
  line-height: 1.45;
}

.problem-evidence {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin: 0 22px 0 26px;
  padding: 10px 0 12px;
  border-top: 1px solid var(--color-neutral-100);
  border-bottom: 1px solid var(--color-neutral-100);
}

.problem-evidence > span {
  flex: 0 0 auto;
  color: var(--color-neutral-500);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  line-height: 2;
}

.problem-evidence > div {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.problem-evidence-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border: 1px solid var(--color-primary-100);
  border-radius: 999px;
  background: #f4f8ff;
  color: var(--color-neutral-700);
  font-size: var(--text-xs);
}

.problem-evidence-chip b {
  color: var(--color-primary-700);
}

.problem-evidence-chip em {
  color: var(--color-danger-600);
  font-style: normal;
  font-weight: var(--font-semibold);
}

.problem-evidence-chip small {
  color: var(--color-neutral-500);
}

.problem-evidence--weak p {
  margin: 0;
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.focus-problem-card-body {
  display: grid;
  gap: var(--space-3);
  padding: 16px 22px 20px 26px;
}

.focus-problem-report strong {
  color: var(--color-neutral-900);
}

.problem-step {
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr);
  gap: var(--space-3);
  padding: 12px 0;
  border-bottom: 1px solid var(--color-neutral-100);
}

.problem-step:last-child {
  border-bottom: 0;
}

.problem-step h4 {
  position: relative;
  margin: 0;
  padding-left: 18px;
  color: var(--color-neutral-900);
  font-size: var(--text-sm);
  line-height: 1.7;
  white-space: nowrap;
}

.problem-step h4::before {
  content: "";
  position: absolute;
  top: 9px;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary-500);
}

.problem-step--具体案例 h4::before {
  background: var(--color-danger-500);
}

.problem-step--原因分析 h4::before {
  background: #b7791f;
}

.problem-step--教学处理 h4::before {
  background: #2f855a;
}

.problem-step-body {
  color: var(--color-neutral-700);
  line-height: 1.8;
}

.problem-step-body p {
  margin: 0;
}

.problem-cases ul,
.focus-problem-card-body > ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.problem-cases li,
.focus-problem-card-body > ul li {
  position: relative;
  margin: 0;
  padding: 10px 12px 10px 16px;
  border-left: 3px solid var(--color-danger-200);
  border-radius: 6px;
  background: #fff7f7;
  color: var(--color-neutral-800);
  line-height: 1.7;
}

.problem-cases li::before,
.focus-problem-card-body > ul li::before {
  content: "";
  position: absolute;
  top: 18px;
  left: -6px;
  width: 9px;
  height: 9px;
  border: 2px solid #fff;
  border-radius: 50%;
  background: var(--color-danger-400);
}

.report-student-link {
  display: inline;
  padding: 0 2px;
  border: 0;
  border-radius: 4px;
  background: #eaf3ff;
  color: var(--color-primary-700);
  font: inherit;
  font-weight: var(--font-semibold);
  text-decoration: none;
  cursor: pointer;
}

.report-student-link:hover {
  background: var(--color-primary-100);
}

.report-essay-modal-mask {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: var(--space-6);
  background: rgba(15, 23, 42, 0.42);
}

.report-essay-modal-mask[hidden],
.report-essay-modal[hidden] {
  display: none;
}

.report-essay-modal {
  width: min(860px, 94vw);
  max-height: 86vh;
  overflow: hidden;
  background: #fff;
  border-radius: 8px;
  box-shadow: var(--shadow-xl);
}

.report-essay-modal-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-neutral-100);
}

.report-essay-modal-head h3 {
  margin: 0 0 4px;
}

.report-essay-modal-head p {
  margin: 0;
  color: var(--color-neutral-500);
}

.report-essay-modal-close {
  width: 34px;
  height: 34px;
  border: 1px solid var(--color-neutral-200);
  border-radius: 50%;
  background: #fff;
  color: var(--color-neutral-700);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
}

.report-essay-modal-body {
  max-height: calc(86vh - 82px);
  overflow: auto;
  padding: var(--space-5);
  line-height: var(--leading-relaxed);
}

.report-essay-modal-body--review .essay-result-body p {
  margin: 0 0 var(--space-3);
  text-indent: 2em;
  line-height: 1.9;
}

.report-essay-modal-body--review .workbench-mini-panel {
  margin-top: var(--space-4);
}

.report-empty-state {
  padding: var(--space-6);
  border: 1px dashed var(--color-neutral-300);
  border-radius: 8px;
  background: var(--color-neutral-50);
}

.lesson-plan {
  display: grid;
  gap: var(--space-4);
}

.lesson-intro {
  padding: var(--space-4);
  border: 1px solid var(--color-primary-100);
  border-radius: 8px;
  background: #f6f9ff;
  color: var(--color-neutral-700);
  line-height: 1.75;
}

.lesson-intro p {
  margin: 0;
}

.lesson-module {
  overflow: hidden;
  border: 1px solid var(--color-neutral-200);
  border-radius: 8px;
  background: #fff;
}

.lesson-module h3 {
  margin: 0;
  padding: 14px 18px;
  border-bottom: 1px solid var(--color-neutral-100);
  background: linear-gradient(90deg, #f8fbff 0%, #fff 100%);
  color: var(--color-neutral-950);
  font-size: var(--text-lg);
}

.lesson-module-body {
  padding: var(--space-4) var(--space-5);
  color: var(--color-neutral-700);
  line-height: 1.78;
}

.lesson-module-body p {
  margin: 0 0 var(--space-3);
}

.lesson-module-body ul,
.lesson-module-body ol {
  display: grid;
  gap: 8px;
  margin: 0 0 var(--space-3);
  padding-left: 1.25rem;
}

.lesson-module-body li {
  padding-left: 2px;
}

.lesson-module-body table {
  width: 100%;
  margin: var(--space-3) 0;
  border-collapse: collapse;
  overflow: hidden;
  border: 1px solid var(--color-neutral-200);
  border-radius: 8px;
  font-size: var(--text-sm);
}

.lesson-module-body th,
.lesson-module-body td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-neutral-100);
  text-align: left;
  vertical-align: top;
}

.lesson-module-body th {
  background: var(--color-neutral-50);
  color: var(--color-neutral-900);
  font-weight: var(--font-semibold);
}

.lesson-module-body blockquote {
  margin: var(--space-3) 0;
  padding: 10px 14px;
  border-left: 4px solid var(--color-primary-300);
  border-radius: 6px;
  background: #f8fbff;
}

.upgrade-workbench {
  display: block;
}

.upgrade-main {
  display: grid;
  gap: var(--space-4);
}

.upgrade-toolbar,
.upgrade-group {
  padding: var(--space-4);
  border: 1px solid var(--color-neutral-200);
  border-radius: 8px;
  background: #fff;
}

.upgrade-toolbar {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-3);
  background: #fff;
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.06);
}

.upgrade-toolbar h2,
.upgrade-group h3 {
  margin: 0 0 6px;
}

.upgrade-toolbar p,
.upgrade-group p {
  margin: 0;
  color: var(--color-neutral-500);
}

.upgrade-toolbar-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.upgrade-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.upgrade-filters button,
.upgrade-check-all {
  border: 1px solid var(--color-neutral-200);
  border-radius: 999px;
  background: #fff;
  color: var(--color-neutral-700);
  cursor: pointer;
  font: inherit;
}

.upgrade-filters button {
  padding: 8px 12px;
}

.upgrade-check-all {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  white-space: nowrap;
}

.upgrade-filters button span {
  margin-left: 6px;
  color: var(--color-primary-700);
  font-weight: var(--font-semibold);
}

.upgrade-filters button.active {
  border-color: var(--color-primary-500);
  background: var(--color-primary-50);
  color: var(--color-primary-700);
}

.upgrade-bulk-actions {
  margin-left: auto;
}

.upgrade-empty-action,
.collection-return-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.collection-return-bar {
  position: sticky;
  top: 0;
  z-index: 35;
  margin-bottom: var(--space-4);
  padding: var(--space-3);
  border: 1px solid var(--color-primary-100);
  border-radius: 8px;
  background: #f6f9ff;
  color: var(--color-neutral-600);
}

.upgrade-group-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-neutral-100);
}

.upgrade-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-neutral-100);
}

.upgrade-card:last-child {
  border-bottom: 0;
}

.upgrade-select {
  display: flex;
  align-items: flex-start;
  padding-top: 4px;
}

.upgrade-select input {
  width: 18px;
  height: 18px;
}

.upgrade-select input:disabled {
  accent-color: var(--color-neutral-400);
  cursor: not-allowed;
}

.upgrade-card--duplicate {
  opacity: 0.72;
}

.upgrade-card--duplicate .upgrade-card-title,
.upgrade-card--duplicate .upgrade-reasons,
.upgrade-card--duplicate .upgrade-task {
  filter: grayscale(0.35);
}

.upgrade-card-title {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.upgrade-card-title strong {
  color: var(--color-danger-600);
}

.upgrade-card-title em {
  color: var(--color-neutral-500);
  font-style: normal;
}

.upgrade-reasons {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 8px 0;
}

.upgrade-reasons span {
  padding: 2px 8px;
  border-radius: 999px;
  background: #fff7ed;
  color: #9a3412;
  font-size: var(--text-xs);
}

.upgrade-task {
  display: grid;
  gap: 4px;
  margin-top: 8px;
  padding: 10px 12px;
  border-left: 3px solid var(--color-primary-400);
  border-radius: 6px;
  background: #f8fbff;
}

.upgrade-task b {
  color: var(--color-neutral-900);
}

.upgrade-card-actions {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
}

.upgrade-sheet {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-6);
  background: #fff;
}

.upgrade-sheet-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.upgrade-sheet-head {
  text-align: center;
  border-bottom: 2px solid var(--color-neutral-900);
  margin-bottom: var(--space-4);
}

.upgrade-sheet-page {
  break-after: page;
  margin-bottom: var(--space-6);
}

.upgrade-sheet-page:last-child {
  break-after: auto;
}

.upgrade-sheet-head h1 {
  margin: 0 0 var(--space-2);
}

.upgrade-sheet-task {
  padding: var(--space-3);
  border: 1px solid var(--color-neutral-300);
  border-radius: 6px;
  margin-bottom: var(--space-4);
}

.upgrade-sheet-task h2 {
  margin: 0 0 var(--space-2);
  font-size: var(--text-lg);
}

.upgrade-sheet-para {
  break-inside: avoid;
  margin-bottom: var(--space-4);
}

.upgrade-sheet-para p {
  margin: 0 0 var(--space-2);
  line-height: 1.9;
}

.upgrade-writing-lines {
  display: grid;
  gap: 12px;
}

.upgrade-writing-lines span {
  height: 28px;
  border-bottom: 1px solid var(--color-neutral-400);
}

@media print {
  .no-print,
  .app-sidebar,
  .sidebar,
  .topbar {
    display: none !important;
  }
  .site-legal-footer {
    display: none !important;
  }
  .app-main,
  .upgrade-sheet {
    padding: 0 !important;
    max-width: none !important;
  }
}

.focus-side-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--color-neutral-100);
}

.focus-side-list li {
  padding: 9px 0;
  border-bottom: 1px solid var(--color-neutral-100);
  background: transparent;
}

.focus-side-list div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.focus-side-list strong {
  color: var(--color-neutral-900);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
}

.focus-side-list span,
.focus-side-list p {
  color: var(--color-neutral-500);
  font-size: var(--text-xs);
}

.focus-side-list p {
  margin: 4px 0 0;
  line-height: 1.5;
}

@media (max-width: 1100px) {
  .focus-dashboard {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 980px) {
  .report-grid--metrics,
  .report-layout {
    grid-template-columns: 1fr;
  }

  .report-header {
    flex-direction: column;
  }
}

/* ─── 教学工作台 ─────────────────────────────────────────────── */
.app-main:has(.teaching-workbench) {
  max-width: none;
  width: 100%;
  padding: 0;
}

.teaching-workbench {
  display: grid;
  --assistant-width: minmax(430px, 30vw);
  grid-template-columns: 190px minmax(0, 1fr) var(--assistant-width);
  gap: 12px;
  min-height: 100vh;
  margin: 0;
  background: var(--color-neutral-50);
}

.teaching-workbench.assistant-closed {
  grid-template-columns: 190px minmax(0, 1fr) 280px;
}

.teaching-workbench.assistant-closed .workbench-assistant {
  visibility: hidden;
  pointer-events: none;
}

.workbench-summon-assistant {
  display: none;
}

.teaching-workbench.assistant-closed .workbench-summon-assistant {
  display: inline-flex;
}

.workbench-left,
.workbench-assistant {
  position: relative;
  background: #fff;
  border-color: var(--color-neutral-200);
  border-style: solid;
  border-width: 0 0 0 1px;
}

.workbench-assistant-resizer {
  position: absolute;
  top: 0;
  bottom: 0;
  left: -8px;
  z-index: 5;
  width: 12px;
  cursor: col-resize;
}

.workbench-assistant-resizer::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 7px;
  width: 1px;
  background: transparent;
  transition: background 0.15s ease;
}

.workbench-assistant-resizer:hover::after,
.teaching-workbench.is-resizing-assistant .workbench-assistant-resizer::after {
  background: var(--color-primary-300);
}

.teaching-workbench.is-resizing-assistant,
.teaching-workbench.is-resizing-assistant * {
  user-select: none;
}

.workbench-left {
  display: flex;
  flex-direction: column;
  min-height: 0;
  border-width: 0 1px 0 0;
  padding: var(--space-5) var(--space-3);
}

.workbench-brand {
  margin-bottom: var(--space-5);
  padding: 0 var(--space-2) var(--space-4);
  border-bottom: 1px solid var(--color-neutral-100);
  color: var(--color-primary-700);
  font-weight: var(--font-semibold);
}

.workbench-task-meta {
  display: grid;
  gap: var(--space-1);
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-neutral-100);
}

.workbench-task-meta span {
  color: var(--color-neutral-500);
  font-size: var(--text-xs);
}

.workbench-task-meta strong {
  color: var(--color-neutral-900);
  font-size: var(--text-sm);
  line-height: 1.45;
}

.workbench-nav {
  display: grid;
  gap: var(--space-1);
  flex: 0 0 auto;
}

.workbench-nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: 0;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-neutral-600);
  cursor: pointer;
  font: inherit;
  font-size: var(--text-sm);
  text-align: left;
}

.workbench-nav-item b {
  flex: 1 1 auto;
  font-weight: var(--font-medium);
}

.workbench-nav-icon {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  border-radius: var(--radius-sm);
  color: var(--color-neutral-500);
  font-style: normal;
}

.workbench-nav-icon::before,
.workbench-nav-icon::after {
  content: "";
  position: absolute;
  box-sizing: border-box;
}

.workbench-nav-icon--collection::before {
  width: 14px;
  height: 16px;
  border: 1.6px solid currentColor;
  border-radius: 3px;
}

.workbench-nav-icon--collection::after {
  width: 7px;
  height: 1.6px;
  top: 8px;
  left: 7px;
  background: currentColor;
  box-shadow: 0 4px 0 currentColor;
}

.workbench-nav-icon--focus::before {
  width: 16px;
  height: 16px;
  border: 1.6px solid currentColor;
  border-radius: 50%;
}

.workbench-nav-icon--focus::after {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.workbench-nav-icon--lesson::before {
  width: 16px;
  height: 13px;
  border: 1.6px solid currentColor;
  border-radius: 3px;
}

.workbench-nav-icon--lesson::after {
  width: 8px;
  height: 1.6px;
  background: currentColor;
  box-shadow: 0 4px 0 currentColor;
}

.workbench-nav-icon--upgrade::before {
  width: 12px;
  height: 12px;
  border-top: 1.8px solid currentColor;
  border-right: 1.8px solid currentColor;
  transform: rotate(-45deg);
  top: 6px;
}

.workbench-nav-icon--upgrade::after {
  width: 1.8px;
  height: 14px;
  background: currentColor;
  top: 5px;
}

.workbench-nav-item:hover,
.workbench-nav-item.active {
  background: var(--color-primary-50);
  color: var(--color-primary-700);
}

.workbench-nav-item:hover .workbench-nav-icon,
.workbench-nav-item.active .workbench-nav-icon {
  color: var(--color-primary-700);
}

.workbench-nav-item span {
  padding: 1px 7px;
  border-radius: 999px;
  background: var(--color-primary-100);
  font-size: var(--text-xs);
}

.workbench-nav-item--collection {
  position: relative;
  padding-right: var(--space-6);
}

.workbench-nav-caret {
  position: absolute;
  right: var(--space-2);
  bottom: 8px;
  width: 7px;
  height: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  opacity: 0.72;
  transition: transform var(--transition-fast);
}

.teaching-workbench.is-collection-open .workbench-nav-caret {
  transform: rotate(225deg);
}

.workbench-main {
  display: flex;
  flex-direction: column;
  min-width: 0;
  height: 100vh;
  overflow: hidden;
  padding: 0;
  background: var(--color-neutral-50);
}

.workbench-header {
  position: relative;
  flex: 0 0 auto;
  z-index: 30;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5);
  border-bottom: 1px solid var(--color-neutral-200);
  background: var(--color-neutral-50);
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.06);
}

.workbench-body {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  padding: var(--space-5);
}

.workbench-header h1 {
  margin: var(--space-2) 0 var(--space-1);
  font-size: var(--text-2xl);
}

.workbench-header p {
  margin: 0;
  color: var(--color-neutral-500);
}

.teaching-workbench:not([data-active-tab="collection"]) .workbench-score-summary,
.teaching-workbench:not([data-active-tab="collection"]) .workbench-header-actions {
  display: none;
}

.workbench-score-summary {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
  color: var(--color-neutral-600);
  font-size: var(--text-sm);
}

.workbench-score-summary__avg,
.workbench-score-summary__bands,
.workbench-missing-zero,
.workbench-missing > summary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-neutral-200);
  border-radius: 999px;
  background: #fff;
}

.workbench-score-summary__avg strong {
  color: var(--color-primary-700);
  font-size: var(--text-base);
}

.workbench-score-summary__bands {
  gap: var(--space-2);
  flex-wrap: wrap;
  padding: 0;
  border: 0;
  background: transparent;
}

.workbench-score-summary__bands button {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-height: 34px;
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-neutral-200);
  border-radius: 999px;
  background: #fff;
  color: inherit;
  cursor: pointer;
  font: inherit;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

.workbench-score-summary__bands button:hover {
  border-color: var(--color-primary-300);
  background: var(--color-primary-50);
  color: var(--color-primary-700);
}

.workbench-score-summary__bands button.active {
  border-color: var(--color-primary-500);
  background: var(--color-primary-50);
  color: var(--color-primary-700);
  font-weight: var(--font-semibold);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.workbench-score-summary__bands b {
  color: var(--color-neutral-900);
  font-weight: var(--font-semibold);
}

.workbench-missing {
  position: relative;
}

.workbench-missing > summary {
  border-color: var(--color-danger-border);
  background: var(--color-danger-light);
  color: var(--color-danger);
  cursor: pointer;
  font-weight: var(--font-medium);
  list-style: none;
}

.workbench-missing > summary::-webkit-details-marker {
  display: none;
}

.workbench-missing > div {
  position: absolute;
  left: 0;
  top: calc(100% + var(--space-2));
  z-index: 60;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  width: min(560px, calc(100vw - 360px));
  max-height: 220px;
  overflow: auto;
  padding: var(--space-3);
  border: 1px solid var(--color-danger-border);
  border-radius: var(--radius-md);
  background: #fff;
  box-shadow: var(--shadow-lg);
}

.workbench-missing-name {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  background: var(--color-neutral-50);
  color: var(--color-neutral-700);
  font-size: var(--text-sm);
}

.workbench-missing-zero {
  color: var(--color-neutral-500);
}

.workbench-global-mode,
.workbench-per-mode {
  display: inline-flex;
  gap: var(--space-2);
  padding: 0;
  border: 0;
  border-radius: var(--radius-md);
  background: transparent;
}

.workbench-global-mode button,
.workbench-per-mode button {
  min-width: 64px;
  min-height: 36px;
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: #fff;
  color: var(--color-neutral-600);
  cursor: pointer;
  font: inherit;
  font-size: var(--text-sm);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

.workbench-global-mode button:hover,
.workbench-per-mode button:hover {
  border-color: var(--color-primary-300);
  background: var(--color-primary-50);
  color: var(--color-primary-700);
}

.workbench-global-mode button.active,
.workbench-per-mode button.active,
.workbench-essay-actions button.active {
  background: var(--color-primary-50);
  border-color: var(--color-primary-600);
  color: var(--color-primary-700);
  font-weight: var(--font-semibold);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.workbench-tab {
  display: none;
}

.workbench-tab.active {
  display: block;
}

.workbench-collection {
  display: block;
}

.workbench-student-drawer {
  display: none;
  min-height: 0;
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-neutral-100);
}

.teaching-workbench.is-collection-open .workbench-student-drawer {
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 280px);
}

.workbench-student-drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
  padding: 0 var(--space-2);
}

.workbench-student-drawer-head strong {
  color: var(--color-neutral-900);
  font-size: var(--text-sm);
}

.workbench-student-drawer-head span {
  color: var(--color-neutral-400);
  font-size: var(--text-xs);
}

.workbench-student-index {
  display: grid;
  align-content: start;
  gap: var(--space-1);
  min-height: 0;
  overflow: auto;
  padding: var(--space-1);
}

.workbench-student-link {
  display: flex;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  color: var(--color-neutral-700);
  text-decoration: none;
  font-size: var(--text-sm);
}

.workbench-student-empty {
  margin: var(--space-2);
  color: var(--color-neutral-400);
  font-size: var(--text-sm);
}

.workbench-student-link:hover,
.workbench-student-link.active {
  background: var(--color-primary-50);
  color: var(--color-primary-700);
}

.workbench-student-link span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.workbench-student-link strong {
  flex: 0 0 auto;
}

.teaching-workbench[data-score-filter="48-60"] [data-score-band]:not([data-score-band="48-60"]):is(.workbench-student-link, .workbench-essay),
.teaching-workbench[data-score-filter="42-47"] [data-score-band]:not([data-score-band="42-47"]):is(.workbench-student-link, .workbench-essay),
.teaching-workbench[data-score-filter="36-42"] [data-score-band]:not([data-score-band="36-42"]):is(.workbench-student-link, .workbench-essay),
.teaching-workbench[data-score-filter="0-36"] [data-score-band]:not([data-score-band="0-36"]):is(.workbench-student-link, .workbench-essay) {
  display: none !important;
}

.workbench-essay-stack {
  display: grid;
  gap: var(--space-5);
}

.workbench-essay {
  padding: var(--space-5);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: #fff;
  box-shadow: var(--shadow-sm);
  scroll-margin-top: var(--space-5);
}

.workbench-essay.active {
  border-color: var(--color-primary-300);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
}

.workbench-essay-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-3);
}

.workbench-essay-head p {
  margin: 0 0 var(--space-1);
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
}

.workbench-essay-head h2 {
  margin: 0;
  color: var(--color-neutral-900);
  font-size: var(--text-xl);
}

.workbench-paper-warning {
  margin-left: var(--space-2);
  color: var(--color-danger);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  vertical-align: middle;
}

.workbench-essay-side {
  display: flex;
  align-items: center;
  justify-items: end;
  gap: var(--space-2);
  flex: 0 0 auto;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.workbench-essay-score {
  color: var(--color-danger);
  font-size: var(--text-2xl);
  font-weight: var(--font-semibold);
  width: 100%;
  text-align: right;
}

.workbench-essay-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.workbench-export-menu .select-menu__panel {
  right: 0;
  left: auto;
}

.workbench-mode-pane {
  display: none;
}

.workbench-mode-pane.active {
  display: block;
}

.workbench-mini-panel {
  margin-top: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
}

.workbench-mini-panel h4 {
  margin: 0 0 var(--space-2);
}

.workbench-mini-panel ol {
  margin: 0;
}

.workbench-side-reading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: var(--space-4);
  align-items: start;
}

.workbench-side-essay {
  color: var(--color-neutral-800);
  line-height: var(--leading-relaxed);
}

.workbench-side-comments {
  display: grid;
  gap: var(--space-3);
  max-height: 70vh;
  overflow: auto;
}

.workbench-comment {
  padding: var(--space-3);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
  cursor: pointer;
}

.workbench-comment.active {
  border-color: var(--color-primary-300);
  background: var(--color-primary-50);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.workbench-comment-head {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.workbench-comment-head span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 999px;
  background: var(--color-primary-100);
  color: var(--color-primary-700);
  font-size: var(--text-xs);
}

.workbench-comment blockquote {
  margin: 0 0 var(--space-2);
  padding-left: var(--space-2);
  border-left: 3px solid var(--color-neutral-200);
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
}

.workbench-comment p {
  margin: 0;
  color: #b42318;
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

.raw-essay-content--embedded {
  padding: 0;
  box-shadow: none;
}

.workbench-paper-mode {
  display: grid;
  gap: var(--space-4);
}

.workbench-paper-pages {
  display: grid;
  gap: var(--space-4);
}

.workbench-paper-page {
  margin: 0;
  padding: var(--space-3);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
}

.workbench-paper-page figcaption {
  margin-bottom: var(--space-2);
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
}

.workbench-paper-page img {
  display: block;
  width: 100%;
  max-height: 760px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  background: #fff;
  cursor: zoom-in;
}

.workbench-paper-page img.zoomed {
  max-height: none;
  cursor: zoom-out;
}

.workbench-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.workbench-section-head h2 {
  margin: 0;
}

.workbench-empty {
  padding: var(--space-8);
  border: 1px dashed var(--color-neutral-300);
  border-radius: var(--radius-md);
  background: #fff;
  color: var(--color-neutral-500);
  text-align: center;
}

.workbench-assistant {
  border-width: 0 0 0 1px;
  display: flex;
  flex-direction: column;
  height: 100vh;
  min-width: 0;
}

.workbench-assistant-head {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-neutral-100);
}

.workbench-assistant-head > div:nth-child(2) {
  flex: 1;
  min-width: 0;
}

.workbench-assistant-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--color-neutral-200);
  border-radius: 999px;
  background: #fff;
  color: var(--color-neutral-500);
  cursor: pointer;
  font-size: 20px;
  line-height: 1;
}

.workbench-assistant-close:hover {
  border-color: var(--color-neutral-300);
  color: var(--color-neutral-900);
}

.workbench-ai-avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--color-primary-600);
  color: #fff;
  font-weight: var(--font-semibold);
}

.workbench-assistant-head h3,
.workbench-assistant-head p {
  margin: 0;
}

.workbench-assistant-head p {
  color: var(--color-neutral-500);
  font-size: var(--text-xs);
}

.workbench-assistant-head p span {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: var(--space-1);
  border-radius: 999px;
  background: var(--color-success);
}

.workbench-assistant-note {
  margin: var(--space-3) var(--space-4) 0;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-primary-100);
  border-radius: var(--radius-md);
  background: var(--color-primary-50);
  color: var(--color-neutral-700);
  font-size: var(--text-xs);
  line-height: 1.65;
}

.workbench-assistant-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-neutral-100);
}

.workbench-assistant-chips button {
  border: 1px solid var(--color-neutral-200);
  border-radius: 999px;
  background: var(--color-neutral-50);
  color: var(--color-neutral-600);
  cursor: pointer;
  font: inherit;
  font-size: var(--text-xs);
  padding: var(--space-1) var(--space-3);
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.workbench-assistant-chips button:hover {
  border-color: var(--color-primary-200);
  background: #fff;
  color: var(--color-primary-700);
}

.workbench-assistant-messages {
  flex: 1;
  overflow: auto;
  padding: var(--space-3) var(--space-4);
}

.workbench-ai-message {
  padding: 10px 12px;
  border: 1px solid var(--color-neutral-100);
  border-radius: var(--radius-md);
  background: var(--color-neutral-50);
  color: var(--color-neutral-700);
  font-size: 13px;
  line-height: 1.75;
}

.workbench-ai-message + .workbench-ai-message {
  margin-top: var(--space-3);
}

.workbench-user-message {
  margin: 0 0 var(--space-3) auto;
  max-width: 88%;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-primary-600);
  color: #fff;
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

.workbench-ai-message--loading,
.workbench-ai-message--error {
  margin-top: var(--space-3);
}

.workbench-ai-message--error {
  border-color: var(--color-danger-100);
  background: #fff5f5;
  color: var(--color-danger);
}

.workbench-ai-message--draft {
  border-color: var(--color-primary-100);
  background: #fff;
}

.workbench-ai-message--draft strong {
  margin-right: 0.2em;
  color: var(--color-neutral-900);
}

.workbench-ai-message--draft p {
  margin: 0 0 8px;
}

.assistant-request {
  color: var(--color-neutral-500);
  font-size: var(--text-xs);
}

.assistant-draft-text {
  margin-bottom: var(--space-3);
  color: var(--color-neutral-800);
  font-size: 13px;
  line-height: 1.82;
}

.assistant-draft-text h4 {
  margin: 14px 0 7px;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--color-neutral-100);
  color: var(--color-neutral-950);
  font-size: 14px;
  font-weight: var(--font-bold);
  line-height: 1.45;
}

.assistant-draft-text h4:first-child {
  margin-top: 0;
}

.assistant-draft-text p {
  margin: 0 0 9px;
}

.assistant-draft-text ul {
  display: grid;
  gap: 6px;
  margin: 0 0 12px;
  padding-left: 1.1em;
}

.assistant-draft-text li {
  padding-left: 0.1em;
}

.assistant-draft-text strong {
  color: var(--color-neutral-950);
  font-weight: var(--font-bold);
}

.workbench-ai-message--draft ul {
  margin: 0 0 10px;
  padding-left: 1.1em;
  color: var(--color-neutral-600);
}

.workbench-assistant-input {
  position: relative;
  padding: var(--space-3);
  border-top: 1px solid var(--color-neutral-100);
}

.workbench-assistant-input textarea {
  width: 100%;
  min-height: 132px;
  resize: none;
  border: 1px solid var(--color-neutral-200);
  border-radius: 14px;
  padding: var(--space-3) 48px var(--space-3) var(--space-3);
  font: inherit;
  font-size: var(--text-sm);
  line-height: 1.7;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.workbench-assistant-input textarea:focus {
  border-color: #dbe7fb;
  box-shadow: 0 0 0 4px #e9f0fd;
}

.workbench-assistant-input button {
  position: absolute;
  right: calc(var(--space-3) + 10px);
  bottom: calc(var(--space-3) + 10px);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 0;
  border-radius: 999px;
  background: #2563eb;
  color: #fff;
  cursor: pointer;
  padding: 0;
  opacity: 0.82;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
  transition: background 0.15s ease, opacity 0.15s ease, transform 0.15s ease;
  z-index: 2;
}

.workbench-assistant-input button span {
  display: block;
  color: currentColor;
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  transform: translateY(-1px);
}

.workbench-assistant-input button.is-ready:not(:disabled) {
  background: #1d4ed8;
  color: #fff;
  cursor: pointer;
  opacity: 1;
}

.workbench-assistant-input button.is-ready:not(:disabled):hover {
  transform: translateY(-1px);
}

.workbench-assistant-input button.is-loading {
  background: #1e40af;
  color: #fff;
  cursor: wait;
  opacity: 0.8;
}

@media (max-width: 1180px) {
  .teaching-workbench {
    grid-template-columns: 170px minmax(0, 1fr);
  }

  .workbench-assistant {
    display: none;
  }
}

@media (max-width: 820px) {
  .teaching-workbench {
    display: block;
    margin: calc(var(--space-4) * -1);
  }

  .workbench-left,
  .workbench-main {
    height: auto;
  }

  .workbench-nav {
    display: flex;
    overflow-x: auto;
  }

  .workbench-nav-item {
    white-space: nowrap;
  }

  .workbench-header,
  .workbench-essay-head {
    flex-direction: column;
  }

  .workbench-side-reading {
    grid-template-columns: 1fr;
  }

  .teaching-workbench.is-collection-open .workbench-student-drawer {
    max-height: 220px;
  }
}

.reader-response-card {
  max-width: 860px;
  margin: 0 auto var(--space-4);
  padding: var(--space-4);
  background: #fffdf8;
  border: 1px solid #eadfcb;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
}

.real-side-paper .reader-response-card,
.essay-html-review-main .reader-response-card {
  max-width: none;
}

.reader-response-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.reader-response-head h2 {
  margin: 0 0 4px;
  font-size: var(--text-lg);
  color: var(--color-neutral-900);
}

.reader-response-head p,
.reader-response-empty {
  margin: 0;
  color: var(--color-neutral-600);
  font-size: var(--text-sm);
}

.reader-response-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.reader-response-actions > span {
  color: var(--color-neutral-500);
  font-size: var(--text-xs);
}

.reader-response-body {
  color: var(--color-neutral-800);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
}

.reader-response-body h1,
.reader-response-body h2,
.reader-response-body h3,
.reader-response-body h4 {
  margin: var(--space-3) 0 var(--space-1);
  font-size: var(--text-base);
  color: var(--color-neutral-900);
}

.reader-response-body p {
  margin: 0 0 var(--space-2);
}

.workbench-seen-lines {
  margin: 0 0 var(--space-4);
  padding: var(--space-4);
  border: 1px solid #eadfcb;
  border-radius: var(--radius-lg);
  background: #fffdf8;
  box-shadow: var(--shadow-xs);
}

.workbench-seen-lines-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.workbench-seen-lines h3 {
  margin: 0;
  color: var(--color-neutral-900);
  font-size: var(--text-lg);
}

.workbench-seen-lines p {
  margin: 0;
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
}

.workbench-seen-lines ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.workbench-seen-lines li {
  min-height: 64px;
  display: flex;
  align-items: center;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: #fff;
  color: var(--color-neutral-800);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

.lesson-page {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0;
}

.lesson-page--editor {
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 0 14px 0 0;
}

.lesson-manager-anchor {
  scroll-margin-top: 0;
}

.lesson-head,
.lesson-detail-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.lesson-head h1,
.lesson-editor-title h1 {
  margin: 0;
  color: var(--color-neutral-950);
  font-size: 24px;
  letter-spacing: 0;
}

.lesson-head p,
.lesson-editor-title span {
  margin: var(--space-1) 0 0;
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
}

.lesson-search {
  width: min(420px, 100%);
  display: flex;
  gap: var(--space-2);
}

.lesson-search input,
.lesson-linkbar input,
.lesson-folder-form input,
.lesson-folder-form select,
.lesson-editor-meta input,
.lesson-editor-meta select,
.lesson-editor-meta textarea,
.lesson-editor-main textarea {
  width: 100%;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: #fff;
  color: var(--color-neutral-900);
}

.lesson-shell {
  display: grid;
  grid-template-columns: 330px minmax(0, 1fr);
  min-height: 100vh;
  border: 0;
  border-radius: 0;
  overflow: visible;
  background: #eef3f7;
  box-shadow: none;
}

.lesson-tree {
  position: sticky;
  top: 0;
  height: 100vh;
  margin: 0;
  border-right: 1px solid #eef1f5;
  background: #f7f9fb;
  padding: 18px 14px 18px 14px;
  overflow-y: auto;
  overflow-x: hidden;
}

.lesson-back-main {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 12px;
  color: #5f6368;
  font-size: 13px;
  text-decoration: none;
}

.lesson-back-main span:first-child {
  font-size: 20px;
  line-height: 1;
}

.lesson-back-main:hover {
  color: #0057ff;
}

.lesson-tree-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin: 18px 0 10px;
  color: var(--color-neutral-950);
  font-size: 16px;
  font-weight: 700;
}

.lesson-view-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 10px;
}

.lesson-view-tab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  background: #f8fafc;
  color: #334155;
  font-size: 13px;
  text-decoration: none;
}

.lesson-view-tab small {
  color: #94a3b8;
  font-size: 11px;
}

.lesson-view-tab.is-active {
  border-color: #2563eb;
  background: #eef4ff;
  color: #1d4ed8;
}

.lesson-view-tab.is-active small {
  color: #2563eb;
}

.lesson-view-tab:hover {
  border-color: #2563eb;
}

.lesson-tree-title::before {
  content: "▣";
  color: #8b8f96;
  font-size: 15px;
}

.lesson-tree-title span {
  flex: 1;
}

.lesson-tree-title button {
  border: 0;
  background: transparent;
  color: #0057ff;
  cursor: pointer;
  font-size: 14px;
}

.lesson-tree-search {
  position: relative;
}

.lesson-tree-search::before {
  content: "⌕";
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: #6b7280;
  font-size: 24px;
}

.lesson-tree-search input {
  width: 100%;
  height: 50px;
  padding: 0 16px 0 64px;
  border: 1px solid #dfe5ee;
  border-radius: 4px;
  background: #fff;
  color: var(--color-neutral-800);
  font-size: 14px;
}

.lesson-tree-item {
  min-height: 30px;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 8px;
  border-radius: var(--radius-md);
  color: var(--color-neutral-700);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.15;
  transition: background .12s ease, color .12s ease;
}

.lesson-tree-row {
  position: relative;
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr) 24px;
  align-items: center;
}

.lesson-tree-row::before {
  display: none;
}

.lesson-tree-row .lesson-tree-item {
  position: relative;
  z-index: 1;
  grid-column: 2;
  padding-left: calc(6px + var(--level) * 16px);
}

.lesson-tree-row.active .lesson-tree-item,
.lesson-tree-row:hover .lesson-tree-item {
  background: #eef1f6;
  color: #0057ff;
}

.lesson-tree-item span:nth-child(2) {
  min-width: 0;
  flex: 1;
}

.lesson-tree-item small {
  display: none;
  color: var(--color-neutral-400);
  font-size: 11px;
  font-weight: 700;
}

.lesson-tree-item--all {
  margin-bottom: var(--space-2);
}

.lesson-tree-item--all small {
  display: inline;
  margin-left: 4px;
  color: #8b95a7;
  font-size: 12px;
  font-weight: 600;
}

.lesson-tree-item:hover,
.lesson-tree-item.active {
  background: #eef1f6;
  color: #0057ff;
}

.lesson-tree-node > summary {
  list-style: none;
}

.lesson-tree-node > summary::-webkit-details-marker {
  display: none;
}

.lesson-tree-toggle,
.lesson-tree-toggle-spacer {
  grid-column: 1;
  width: 18px;
  height: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: #94a3b8;
  font-size: 13px;
  line-height: 1;
}

.lesson-tree-toggle {
  cursor: pointer;
  transition: color .12s ease, background .12s ease;
}

.lesson-tree-toggle-spacer {
  content: "";
  border: 0;
  border-radius: 0;
  background: transparent;
}

.lesson-tree-toggle:hover {
  color: #0057ff;
  background: #eef1f6;
}

.lesson-tree-menu {
  position: relative;
  z-index: 10;
  grid-column: 4;
  opacity: 0;
  pointer-events: none;
}

.lesson-tree-plus {
  grid-column: 3;
  width: 24px;
  height: 24px;
  border: 0;
  background: transparent;
  color: #0057ff;
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  opacity: 0;
}

.lesson-tree-row:hover .lesson-tree-plus,
.lesson-tree-row:hover .lesson-tree-menu {
  opacity: 1;
  pointer-events: auto;
}

.lesson-tree-menu-trigger {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: #8b8f96;
  cursor: pointer;
  font-size: 16px;
}

.lesson-tree-menu-trigger:hover {
  color: #0057ff;
}

.lesson-tree-menu-pop {
  position: absolute;
  right: -4px;
  top: 30px;
  width: 126px;
  display: grid;
  gap: 0;
  padding: 14px 0;
  border: 1px solid #edf0f4;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.12);
  visibility: hidden;
  opacity: 0;
  transform: translateY(-3px);
  transition: opacity .12s ease, transform .12s ease;
}

.lesson-tree-menu:hover .lesson-tree-menu-pop,
.lesson-tree-menu:focus-within .lesson-tree-menu-pop {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
}

.lesson-tree-menu-pop form {
  display: grid;
  gap: 8px;
  padding: 6px 14px;
}

.lesson-tree-menu-pop > form:nth-of-type(1),
.lesson-tree-menu-pop > form:nth-of-type(2) {
  display: none;
}

.lesson-tree-menu-pop label,
.lesson-tree-menu-pop input,
.lesson-tree-menu-pop select {
  display: block;
}

.lesson-tree-menu-pop input,
.lesson-tree-menu-pop select {
  width: 100%;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: #fff;
  font-size: 13px;
}

.lesson-tree-menu-pop button {
  min-height: 30px;
  border: 0;
  border-radius: 4px;
  background: #fff;
  color: #222;
  cursor: pointer;
  font-size: 13px;
  text-align: left;
}

.lesson-tree-menu-pop button:hover {
  background: var(--color-primary-50);
  color: var(--color-primary-700);
}

.lesson-tree-menu-pop button.danger {
  color: #b42318;
}

.lesson-folder-form {
  display: none;
}

.lesson-folder-form-title {
  color: var(--color-neutral-500);
  font-size: var(--text-xs);
  font-weight: 700;
}

.lesson-main {
  min-width: 0;
  background: #fbfcfe;
  padding: 0;
  min-height: 100vh;
}

.lesson-topbar,
.lesson-actions {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--space-3);
}

.lesson-topbar {
  min-height: 72px;
  padding: 14px 30px;
  border-bottom: 1px solid #e5e7eb;
  background: #fff;
}

.lesson-topbar--sticky {
  position: sticky;
  top: 0;
  z-index: 25;
}

.lesson-topbar--recycle {
  justify-content: space-between;
}

.lesson-recycle-title {
  color: #111827;
  font-size: 17px;
  font-weight: 700;
}

.lesson-recycle-title span {
  margin-left: 10px;
  color: #8b95a7;
  font-size: 13px;
  font-weight: 500;
}

.lesson-breadcrumb {
  padding: 18px 30px;
  color: #8b8f96;
  font-size: 14px;
}

.lesson-breadcrumb a {
  color: inherit;
  text-decoration: none;
}

.lesson-breadcrumb a:hover {
  color: #0057ff;
}

.lesson-breadcrumb .is-current {
  color: #222;
  font-weight: 600;
}

.lesson-breadcrumb-separator {
  margin: 0 6px;
  color: #c1c7d0;
}

.lesson-breadcrumb .lesson-breadcrumb-count {
  margin-left: 12px;
  color: #9ca3af;
  font-size: 14px;
}

.lesson-toolbar strong {
  color: var(--color-neutral-950);
}

.lesson-toolbar em {
  display: block;
  margin-top: 3px;
  color: var(--color-neutral-500);
  font-size: var(--text-xs);
  font-style: normal;
}

.lesson-toolbar span {
  margin-left: var(--space-2);
  color: var(--color-neutral-500);
  font-size: var(--text-sm);
}

.lesson-upload-btn {
  position: relative;
  overflow: hidden;
}

.lesson-upload-btn input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.lesson-linkbar {
  display: flex;
  gap: var(--space-2);
  margin: 0;
  min-width: min(560px, 48vw);
}

.lesson-linkbar input {
  height: 38px;
  min-width: 240px;
  padding: 0 12px;
}

.lesson-linkbar button span {
  margin: 0 4px 0 0;
  color: inherit;
  font-size: 14px;
}

.lesson-table {
  margin: 18px 30px 0;
  width: calc(100% - 60px);
}

.lesson-tree-trash {
  display: block;
  margin-top: 28px;
  color: #222;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.lesson-tree-row[draggable="true"] {
  cursor: grab;
}

.lesson-tree-row.is-dragging {
  opacity: .45;
}

.lesson-tree-item.is-drag-over {
  color: #0057ff;
  background: #eef4ff;
  outline: 1px dashed #7aa7ff;
}

.lesson-tree-trash::before {
  content: "▥";
  margin-right: 10px;
  color: #8b8f96;
}

.lesson-detail-actions {
  display: flex;
  gap: 8px;
}

.lesson-preview-page {
  max-width: 980px;
  margin: 0 auto;
  padding: 32px 28px 64px;
}

.lesson-preview-page-head {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 18px;
  margin-bottom: 24px;
  padding: 14px 0 14px;
  border-bottom: 1px solid var(--color-neutral-200);
  background: rgba(250, 251, 252, .96);
  backdrop-filter: blur(4px);
}

.lesson-preview-page-head a {
  color: var(--color-primary-700);
  text-decoration: none;
}

.lesson-preview-back {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: #fff;
  border: 1px solid #e2e8f0;
  color: #334155;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
  flex-shrink: 0;
  user-select: none;
}
.lesson-preview-back:hover {
  background: #eef4ff;
  color: #2563eb;
  border-color: #bfdbfe;
}

.lesson-preview-page-head h1 {
  margin: 0;
  font-size: 24px;
}

.lesson-preview-page-head span {
  color: var(--color-neutral-500);
  font-size: 13px;
}

.lesson-preview-head-actions {
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  white-space: nowrap;
}

.lesson-preview-head-actions .lesson-preview-edit,
.lesson-preview-head-actions .lesson-preview-export {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: 8px;
  border: 1px solid #c7d4ea;
  background: #fff;
  color: #2563eb;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  line-height: 1.4;
  cursor: pointer;
  flex-shrink: 0;
  transition: background .15s ease, border-color .15s ease, color .15s ease, box-shadow .15s ease;
}
.lesson-preview-head-actions .lesson-preview-edit svg,
.lesson-preview-head-actions .lesson-preview-export svg {
  width: 15px;
  height: 15px;
}
.lesson-preview-head-actions .lesson-preview-edit:hover,
.lesson-preview-head-actions .lesson-preview-export:hover {
  background: #2563eb;
  border-color: #2563eb;
  color: #fff;
  box-shadow: 0 3px 10px rgba(37, 99, 235, .25);
}

/* 预览页「下载原文件」次级按钮：白底描边，干净清晰 */
.lesson-preview-head-actions .lesson-preview-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 13px;
  border-radius: 8px;
  border: 1px solid #d6deeb;
  background: #fff;
  color: #3b4758;
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  line-height: 1.4;
  cursor: pointer;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
  flex-shrink: 0;
}
.lesson-preview-head-actions .lesson-preview-download:hover {
  background: #f1f5fb;
  border-color: #b6c4da;
  color: #1e40af;
}

.lesson-preview-page-body {
  min-height: 70vh;
  padding: 32px 38px;
  border: 1px solid var(--color-neutral-200);
  border-radius: 8px;
  background: #fff;
}

/* ─── 预览正文（markdown 渲染结果）排版 ──────────────────────────
   为什么需要这一整块：
     AI 生成的教案存的是 markdown，预览时经 mistune 转成 HTML 塞进
     .lesson-preview-page-body。但这个类名在 style.css 里**原本一条规则都没有**，
     于是正文里每个标签都落回浏览器默认样式 —— 而全局那几条 h1/h2/h3 只写了
     margin-bottom、没写 margin-top，标题就紧贴上一段；ul/ol 用默认的 40px 缩进、
     table 没有内边距、blockquote 只有一个大缩进。几条叠起来就是「预览很丑」。
   配色沿用页面已有的中性灰蓝（#0f172a / #475569 / #e8edf3），不引入高饱和色。 */
.lesson-preview-page-body {
  font-size: 16px;
  line-height: 1.8;
  color: #1f2937;
  word-wrap: break-word;
}

.lesson-preview-page-body > :first-child {
  margin-top: 0;
}

.lesson-preview-page-body > :last-child {
  margin-bottom: 0;
}

.lesson-preview-page-body h1,
.lesson-preview-page-body h2,
.lesson-preview-page-body h3,
.lesson-preview-page-body h4,
.lesson-preview-page-body h5,
.lesson-preview-page-body h6 {
  /* 上边距是这里的关键：只给下边距会让每个新章节粘在前一段上，整页糊成一片 */
  margin: 1.9em 0 .7em;
  font-weight: 600;
  line-height: 1.45;
  color: #0f172a;
}

.lesson-preview-page-body h1 {
  font-size: 22px;
}

.lesson-preview-page-body h2 {
  font-size: 20px;
  /* 章节之间给一道极淡的横线，长教案滚动时一眼能分出章节 */
  padding-bottom: 9px;
  border-bottom: 1px solid #e8edf3;
  margin-top: 2.1em;
}

.lesson-preview-page-body h3 {
  font-size: 17px;
  /* 教学环节标题（一、导入…）给一根中性色竖条，便于扫读 */
  padding-left: 10px;
  border-left: 3px solid #cbd5e1;
  margin-top: 1.7em;
}

.lesson-preview-page-body h4 {
  font-size: 16px;
  color: #334155;
}

.lesson-preview-page-body p {
  margin: 0 0 1em;
}

.lesson-preview-page-body ul,
.lesson-preview-page-body ol {
  /* 默认 40px 缩进在中文正文里过宽，左侧参差不齐 */
  margin: 0 0 1em;
  padding-left: 1.6em;
}

.lesson-preview-page-body li {
  margin: .3em 0;
}

.lesson-preview-page-body li > ul,
.lesson-preview-page-body li > ol {
  margin: .3em 0;
}

.lesson-preview-page-body li::marker {
  color: #64748b;
}

.lesson-preview-page-body blockquote {
  margin: 1em 0;
  padding: 10px 15px;
  border-left: 3px solid #c7d2e0;
  border-radius: 0 6px 6px 0;
  background: #f8fafc;
  color: #475569;
}

.lesson-preview-page-body blockquote > :last-child {
  margin-bottom: 0;
}

.lesson-preview-page-body table {
  /* 表格在教案里很常见（环节/问题/处置三列），默认样式几乎裸奔 */
  width: 100%;
  margin: 1.1em 0;
  border: 1px solid #e2e8f0;
  border-collapse: collapse;
  border-radius: 6px;
  overflow: hidden;
  font-size: 14px;
  line-height: 1.65;
}

.lesson-preview-page-body th,
.lesson-preview-page-body td {
  padding: 8px 12px;
  border: 1px solid #e8edf3;
  text-align: left;
  vertical-align: top;
}

.lesson-preview-page-body th {
  background: #f1f5f9;
  font-weight: 600;
  color: #0f172a;
}

.lesson-preview-page-body tbody tr:nth-child(even) td {
  background: #fafcfe;
}

.lesson-preview-page-body pre {
  margin: 1.1em 0;
  padding: 12px 15px;
  border: 1px solid #e5eaf1;
  border-radius: 6px;
  background: #f8fafc;
  font-size: 13px;
  line-height: 1.7;
  /* 板书/结构图常是中文，不要横向滚动条 */
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: auto;
}

.lesson-preview-page-body code {
  padding: 1px 5px;
  border-radius: 4px;
  background: #f1f5f9;
  font-size: .92em;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Microsoft YaHei", monospace;
  color: #334155;
}

.lesson-preview-page-body pre code {
  padding: 0;
  background: none;
  font-size: inherit;
}

.lesson-preview-page-body hr {
  margin: 2em 0;
  border: 0;
  border-top: 1px solid #e8edf3;
}

.lesson-preview-page-body strong {
  font-weight: 600;
  color: #0f172a;
}

.lesson-preview-page-body em {
  color: #334155;
}

.lesson-preview-page-body a {
  color: #2563eb;
  text-decoration: none;
  border-bottom: 1px solid rgba(37, 99, 235, .28);
}

.lesson-preview-page-body a:hover {
  border-bottom-color: #2563eb;
}

.lesson-preview-page-body img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
}

/* 转换中占位页里的文字兜底也走同一套正文排版 */
.lesson-preview-page-body .lesson-text-fallback {
  line-height: 1.8;
}

.lesson-preview-status {
  display: grid;
  gap: 4px;
  margin: 0 0 18px;
  padding: 12px 14px;
  border-radius: 6px;
  border: 1px solid #dbe3ef;
  background: #f8fafc;
  color: #475569;
  font-size: 13px;
  line-height: 1.55;
}

.lesson-preview-status strong {
  color: #0f172a;
  font-size: 14px;
}

.lesson-preview-status--ok {
  border-color: #bfdbfe;
  background: #eff6ff;
}

.lesson-preview-status--warn {
  border-color: #fed7aa;
  background: #fff7ed;
}

.lesson-text-fallback {
  color: #334155;
  line-height: 1.8;
}

/* 教案预览页表格 */
.lesson-md-table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0 16px;
  font-size: 13px;
}

.lesson-md-table th,
.lesson-md-table td {
  border: 1px solid #d7dee8;
  padding: 7px 10px;
  text-align: left;
  line-height: 1.6;
  vertical-align: top;
}

.lesson-md-table th {
  background: #f2f6fb;
  font-weight: 700;
  color: #1e293b;
}

.lesson-md-table tr:nth-child(even) td {
  background: #fafbfd;
}

.lesson-slide-preview {
  margin: 0 0 22px;
  padding: 22px 26px;
  border: 1px solid #dbe3ef;
  border-radius: 6px;
  background: #fbfdff;
}

.lesson-slide-preview:last-child {
  margin-bottom: 0;
}

.lesson-slide-preview h2 {
  margin: 0 0 14px;
  color: #2563eb;
  font-size: 15px;
  font-weight: 700;
}

.lesson-rendered-page {
  margin: 0 auto 24px;
  max-width: 900px;
  text-align: center;
}

.lesson-rendered-page img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid #d8dee8;
  box-shadow: 0 2px 10px rgba(15, 23, 42, .08);
  background: #fff;
}

.lesson-pdf-toolbar {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  margin: -20px -20px 22px;
  padding: 10px;
  border-bottom: 1px solid #dbe3ef;
  background: rgba(255, 255, 255, .96);
}

.lesson-pdf-toolbar button {
  border: 1px solid #cbd5e1;
  border-radius: 4px;
  background: #fff;
  padding: 5px 12px;
  cursor: pointer;
}

.lesson-pdf-toolbar button:disabled {
  cursor: default;
  opacity: .45;
}

.lesson-pdf-viewer {
  display: flex;
  justify-content: center;
  min-height: 70vh;
  background: #eef2f7;
  padding: 18px;
}

.lesson-pdf-viewer canvas {
  max-width: 100%;
  height: auto;
  background: #fff;
  box-shadow: 0 2px 12px rgba(15, 23, 42, .14);
}

.lesson-modal[hidden] {
  display: none;
}

.lesson-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
}

.lesson-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
}

.lesson-modal-card {
  position: relative;
  width: min(760px, calc(100vw - 48px));
  margin: 20vh auto 0;
  display: grid;
  gap: 26px;
  padding: 0 30px 34px;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 18px 50px rgba(15, 23, 42, 0.25);
}

.lesson-modal-head {
  height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 0 -30px;
  padding: 0 30px;
  border-bottom: 1px solid #e5e7eb;
}

.lesson-modal-head h2 {
  margin: 0;
  font-size: 24px;
}

.lesson-modal-head button {
  border: 0;
  background: transparent;
  color: #666;
  cursor: pointer;
  font-size: 34px;
}

.lesson-modal-card label {
  display: grid;
  gap: 12px;
  color: #555;
  font-size: 20px;
}

.lesson-modal-card input,
.lesson-modal-card select {
  height: 48px;
  border: 1px solid #dfe5ee;
  border-radius: 8px;
  background: #fff;
  font-size: 20px;
}

.lesson-modal-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
}

/* 紧凑版弹窗（新建文件夹/重命名等小输入框）：细腻、贴合页面风格，面板更小、字体更小 */
.lesson-modal-card--compact {
  width: min(540px, calc(100vw - 40px));
  gap: 20px;
  padding: 0 26px 28px;
  border-radius: 12px;
}
.lesson-modal-card--compact .lesson-modal-head {
  height: 62px;
  margin: 0 -26px;
  padding: 0 26px;
}
.lesson-modal-card--compact .lesson-modal-head h2 {
  font-size: 20px;
  font-weight: 600;
  color: #1f2d3d;
}
.lesson-modal-card--compact .lesson-modal-head button {
  font-size: 28px;
  color: #94a3b8;
  line-height: 1;
}
.lesson-modal-card--compact .lesson-modal-head button:hover { color: #ef4444; }
.lesson-modal-card--compact label {
  gap: 10px;
  font-size: 15px;
  color: #475569;
}
.lesson-modal-card--compact input,
.lesson-modal-card--compact select {
  height: 40px;
  font-size: 15px;
  padding: 0 12px;
  border: 1px solid #d7deea;
  border-radius: 8px;
  background: #f8fafc;
  color: #1f2d3d;
}
.lesson-modal-card--compact input:focus,
.lesson-modal-card--compact select:focus {
  border-color: #3474f4;
  background: #fff;
  outline: none;
  box-shadow: 0 0 0 3px rgba(52, 116, 244, .12);
}
.lesson-modal-card--compact .lesson-modal-actions { gap: 12px; }
.lesson-modal-card--compact .btn { padding: 8px 20px; font-size: 14px; border-radius: 8px; }
.lesson-modal-card--compact .lesson-modal-hint {
  margin: 0;
  font-size: 13px;
  color: #64748b;
}
.lesson-modal-card--compact .lesson-modal-hint strong {
  color: #1f2d3d;
  font-weight: 600;
}

.lesson-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  margin: 0 30px;
  width: calc(100% - 60px);
}

.lesson-doc-list {
  display: grid;
  gap: 8px;
  padding: 16px 30px 40px;
}

.lesson-doc-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  border: 1px solid #eef1f5;
  border-radius: var(--radius-lg);
  background: #fff;
  transition: border-color .12s ease, box-shadow .12s ease;
}

.lesson-doc-card:hover {
  border-color: #dde3ec;
  box-shadow: 0 2px 8px rgba(15, 23, 42, .05);
}

.lesson-doc-main {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
  text-decoration: none;
  color: inherit;
}

.lesson-doc-body {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.lesson-doc-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-neutral-900);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-doc-summary {
  font-size: 12px;
  color: var(--color-neutral-500);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-doc-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  color: var(--color-neutral-400);
  font-size: 12px;
}

.lesson-doc-type {
  padding: 2px 8px;
  border-radius: 9999px;
  background: var(--color-neutral-100);
  color: var(--color-neutral-600);
  font-size: 11px;
}

.lesson-doc-date {
  min-width: 72px;
  text-align: right;
}

.lesson-table th,
.lesson-table td {
  padding: 13px 10px;
  border-bottom: 1px solid var(--color-neutral-100);
  text-align: left;
  vertical-align: middle;
}

.lesson-table tbody tr {
  transition: background .12s ease;
}

.lesson-table tbody tr:hover {
  background: #f7f9fc;
}

.lesson-table th {
  color: var(--color-neutral-500);
  font-size: var(--text-xs);
  font-weight: 700;
}

.lesson-file-name {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-neutral-900);
  font-weight: 650;
  text-decoration: none;
}

.lesson-link-open {
  display: inline-grid;
  place-items: center;
  width: 20px;
  height: 20px;
  margin-left: 6px;
  border: 1px solid #dbe3ef;
  border-radius: 5px;
  color: #2563eb;
  font-size: 12px;
  text-decoration: none;
  vertical-align: middle;
}

.lesson-link-open:hover {
  background: #eef4ff;
  border-color: #2563eb;
}

.lesson-file-icon {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 7px;
  position: relative;
  background: linear-gradient(135deg, var(--file-icon-color), color-mix(in srgb, var(--file-icon-color) 84%, #000));
  color: #fff;
  font-size: 9px;
  font-weight: 800;
  letter-spacing: .1px;
  line-height: 1;
  flex: 0 0 auto;
  box-shadow: 0 1px 3px rgba(15, 23, 42, .14);
  text-transform: uppercase;
}

.lesson-file-icon::after {
  content: "FILE";
}

.lesson-file-icon::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 10px;
  height: 10px;
  border-radius: 0 7px 0 4px;
  background: rgba(255, 255, 255, .22);
}

.lesson-file-icon--docx { --file-icon-color: #2b579a; }
.lesson-file-icon--docx::after { content: "DOCX"; font-size: 7px; }
.lesson-file-icon--doc { --file-icon-color: #3b6db5; }
.lesson-file-icon--doc::after { content: "DOC"; }
.lesson-file-icon--pdf { --file-icon-color: #e74c3c; }
.lesson-file-icon--pdf::after { content: "PDF"; }
.lesson-file-icon--pptx { --file-icon-color: #d24726; }
.lesson-file-icon--pptx::after { content: "PPTX"; font-size: 7px; }
.lesson-file-icon--ppt { --file-icon-color: #c0392b; }
.lesson-file-icon--ppt::after { content: "PPT"; }
.lesson-file-icon--html,
.lesson-file-icon--url { --file-icon-color: #e65100; }
.lesson-file-icon--html::after { content: "HTML"; font-size: 7px; }
.lesson-file-icon--url::after { content: "URL"; }
.lesson-file-icon--md { --file-icon-color: #636e72; }
.lesson-file-icon--md::after { content: "MD"; }
.lesson-file-icon--txt { --file-icon-color: #636e72; }
.lesson-file-icon--txt::after { content: "TXT"; }
.lesson-file-icon--file { --file-icon-color: #78909c; }

.lesson-doc-actions {
  position: relative;
  width: 42px;
  text-align: right;
}

.lesson-doc-more {
  border: 0;
  background: transparent;
  color: #64748b;
  font-size: 18px;
  cursor: pointer;
}

.lesson-doc-menu {
  position: absolute;
  right: 0;
  top: 28px;
  z-index: 20;
  display: none;
  width: 180px;
  padding: 8px;
  border: 1px solid #dbe3ef;
  border-radius: 6px;
  background: #fff;
  box-shadow: 0 8px 22px rgba(15, 23, 42, .14);
}

.lesson-doc-menu.is-open { display: grid; gap: 6px; }
.lesson-doc-menu > form { display: none; }
.lesson-doc-menu > form:last-of-type { display: contents; }
.lesson-doc-menu select,
.lesson-doc-menu input { min-width: 0; flex: 1; border: 1px solid #dbe3ef; border-radius: 3px; padding: 5px; font-size: 12px; }
.lesson-doc-menu > button,
.lesson-doc-menu > form button { width: 100%; border: 0; background: transparent; color: #334155; cursor: pointer; font-size: 12px; text-align: left; white-space: nowrap; }
.lesson-doc-menu button:hover { color: #0057ff; }
.lesson-doc-menu button.danger { color: #b42318; }

.lesson-empty {
  height: 220px;
  color: var(--color-neutral-500);
  text-align: center !important;
}

.lesson-editor {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: var(--space-4);
}

.lesson-editor--split {
  grid-template-columns: minmax(700px, 1fr) 10px minmax(440px, 60%);
  align-items: stretch;
  gap: 0;
  width: 100%;
}

/* 最大化：隐藏左侧 AI 对话与分隔条，教案编辑器占满可编辑区（非全屏，保持页面其它样式） */
.lesson-editor--split.is-maximized {
  grid-template-columns: minmax(0, 1fr);
}
.lesson-editor--split.is-maximized .lesson-main-pane--ai,
.lesson-editor--split.is-maximized .lesson-column-resizer {
  display: none;
}
.lesson-editor--split.is-maximized .lesson-preview-pane {
  min-width: 0;
}

.lesson-editor-meta,
.lesson-editor-main {
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow-xs);
}

.lesson-editor-meta {
  display: grid;
  align-content: start;
  gap: var(--space-3);
  padding: var(--space-4);
}

.lesson-editor-meta label {
  display: grid;
  gap: var(--space-1);
  color: var(--color-neutral-600);
  font-size: var(--text-xs);
  font-weight: 700;
}

.lesson-editor-main {
  min-width: 0;
  padding: 0;
  overflow: visible;
}

.lesson-editor-top {
  position: sticky;
  top: 0;
  z-index: 31;
  display: grid;
  grid-template-columns: minmax(320px, 1fr) 220px;
  align-items: end;
  gap: 14px;
  padding: 14px 18px 12px;
  border-bottom: 1px solid #e2e8f0;
  border-radius: 0;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: blur(10px);
}

.lesson-editor-top label {
  display: grid;
  gap: 5px;
  color: #64748b;
  font-size: 12px;
  font-weight: 700;
}

.lesson-editor-top label > span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.lesson-title-back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  color: #2563eb;
  font-size: 16px;
  line-height: 1;
  text-decoration: none;
}

.lesson-title-back:hover {
  background: #eff6ff;
}

.lesson-editor-top input,
.lesson-editor-top select {
  height: 36px;
  min-width: 0;
  border: 1px solid #dbe3ef;
  border-radius: 6px;
  background: #fff;
  color: #0f172a;
  font-size: 14px;
  padding: 0 10px;
}

.lesson-title-input input {
  font-size: 16px;
  font-weight: 650;
}

.lesson-autosave-status {
  display: none;
}

.lesson-editor-main textarea {
  min-height: 520px;
  padding: var(--space-4);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  resize: vertical;
}

.lesson-wang-editor {
  overflow: visible;
  border: 0;
  border-radius: var(--radius-lg);
  background: #fff;
}

.lesson-wang-toolbar {
  position: sticky;
  top: 74px;
  z-index: 30;
  border-bottom: 1px solid #e2e8f0;
  background: #fbfdff;
}

.lesson-wang-toolbar .w-e-bar {
  flex-wrap: wrap !important;
  overflow: visible !important;
  min-height: 46px;
  padding: 5px 8px !important;
}

.lesson-wang-toolbar .w-e-drop-panel,
.lesson-wang-toolbar .w-e-select-list,
.lesson-wang-toolbar .w-e-modal,
.lesson-wang-toolbar .w-e-bar-item-menus-container,
.lesson-wang-toolbar .w-e-hover-bar {
  z-index: 1200 !important;
}

.lesson-wang-body {
  min-height: 560px;
  cursor: text;
}

.lesson-wang-body .w-e-text-container {
  min-height: 560px !important;
  font-size: 16px;
  line-height: 1.8;
  cursor: text;
}

.lesson-wang-body [data-slate-editor="true"] {
  min-height: 520px;
  outline: none;
}

/* 编辑器右键菜单 */
.lesson-wang-ctxmenu {
  position: fixed;
  z-index: 1500;
  min-width: 180px;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, .16);
  padding: 6px;
}
.lesson-wang-ctxmenu[hidden] {
  display: none;
}
.lesson-wang-ctxmenu-group {
  display: flex;
  align-items: center;
  gap: 2px;
}
.lesson-wang-ctxmenu-group button {
  border: 0;
  background: transparent;
  color: #334155;
  font-size: 13px;
  line-height: 1;
  cursor: pointer;
  border-radius: 6px;
  padding: 7px 9px;
  white-space: nowrap;
  transition: background .12s ease, color .12s ease;
}
.lesson-wang-ctxmenu-group button:hover {
  background: #eef4ff;
  color: #2563eb;
}
/* 无选区时隐藏格式行 */
.lesson-wang-ctxmenu:not(.has-selection) .lesson-wang-ctxmenu-group:first-of-type,
.lesson-wang-ctxmenu:not(.has-selection) .lesson-wang-ctxmenu-sep {
  display: none;
}
.lesson-wang-ctxmenu-sep {
  height: 1px;
  background: #edf2f7;
  margin: 5px 4px;
}
/* 色板 */
.lesson-wang-ctxmenu-cols {
  margin-top: 6px;
  border-top: 1px solid #edf2f7;
  padding-top: 6px;
}
.lesson-wang-ctxmenu-cols[hidden] {
  display: none;
}
.lesson-wang-ctxmenu-cols-head {
  font-size: 12px;
  color: #64748b;
  margin-bottom: 6px;
}
.lesson-wang-ctxmenu-cols-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.lesson-wang-ctxmenu-color {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid #e2e8f0;
  cursor: pointer;
  padding: 0;
  box-sizing: border-box;
}
.lesson-wang-ctxmenu-color:hover {
  transform: scale(1.12);
}
.lesson-wang-ctxmenu-color.is-none {
  background: repeating-linear-gradient(45deg, #fff 0 4px, #f1f5f9 4px 8px);
  border-color: #cbd5e1;
}

.lesson-wang-body .w-e-scroll {
  min-height: 560px;
  overflow: visible;
}

.lesson-wang-body .table-container {
  width: 100%;
  max-width: 100%;
  overflow-x: auto !important;
  border: 1px dashed #cbd5e1 !important;
  background: #fff;
}

.lesson-wang-body .table-container:hover {
  border-color: #3b82f6 !important;
}

.lesson-wang-body table {
  width: 100%;
  min-width: 0;
  table-layout: auto;
}

.lesson-wang-body table td,
.lesson-wang-body table th {
  height: auto !important;
  min-height: 0 !important;
  min-width: 48px !important;
  padding: 6px 8px !important;
  vertical-align: top;
}

.lesson-ai-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 12px;
  padding: 12px 14px;
  border: 1px solid #dbe3ef;
  border-radius: 8px;
  background: #f8fafc;
}

.lesson-column-resizer {
  width: 10px;
  min-height: 720px;
  cursor: col-resize;
  position: relative;
}

.lesson-column-resizer::before {
  content: "";
  position: absolute;
  top: 16px;
  bottom: 16px;
  left: 4px;
  width: 2px;
  border-radius: 999px;
  background: #e2e8f0;
}

.lesson-column-resizer:hover::before,
body.is-resizing-lesson .lesson-column-resizer::before {
  background: #2563eb;
}

body.is-resizing-lesson {
  cursor: col-resize;
  user-select: none;
}

.lesson-ai-sidebar {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 260px;
  width: 100%;
  max-height: calc(100vh - 104px);
  position: sticky;
  top: 16px;
  align-self: start;
  justify-self: stretch;
  padding: 16px;
  border: 1px solid #dbe3ef;
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow-xs);
}

.lesson-ai-sidebar-head {
  display: grid;
  gap: 4px;
  padding-bottom: 10px;
  border-bottom: 1px solid #edf2f7;
}

.lesson-ai-sidebar-head strong {
  color: #0f172a;
  font-size: 16px;
}

.lesson-ai-sidebar-head span {
  color: #64748b;
  font-size: 13px;
  line-height: 1.5;
}

.lesson-ai-sidebar-actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.lesson-ai-sidebar-actions button,
.lesson-ai-run {
  width: 100%;
}

.lesson-ai-sidebar-actions button {
  border: 1px solid #dbe3ef;
  border-radius: 6px;
  background: #f8fafc;
  color: #334155;
  cursor: pointer;
  font-size: 13px;
  padding: 9px 10px;
  text-align: left;
}

.lesson-ai-sidebar-actions button:hover {
  border-color: #2563eb;
  color: #1d4ed8;
}

.lesson-ai-prompt {
  min-height: 180px;
  resize: vertical;
  border: 1px solid #dbe3ef;
  border-radius: 8px;
  color: #0f172a;
  font-size: 14px;
  line-height: 1.65;
  padding: 10px;
}

.lesson-ai-cards {
  display: grid;
  gap: 8px;
}

.lesson-ai-mode {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  background: #f8fafc;
  cursor: pointer;
  padding: 10px 12px;
  text-align: left;
  transition: border-color .15s ease, background .15s ease, box-shadow .15s ease;
}

.lesson-ai-mode:hover {
  border-color: #2563eb;
  background: #fff;
}

.lesson-ai-mode.is-active {
  border-color: #2563eb;
  background: #eef4ff;
  box-shadow: 0 0 0 1px #2563eb inset;
}

.lesson-ai-mode-ico {
  flex: 0 0 auto;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: #eef2ff;
  color: #4f46e5;
  font-size: 15px;
}

.lesson-ai-mode.is-active .lesson-ai-mode-ico {
  background: #2563eb;
  color: #fff;
}

.lesson-ai-mode-body {
  display: grid;
  gap: 2px;
}

.lesson-ai-mode-body strong {
  font-size: 13px;
  font-weight: 500;
  color: #0f172a;
}

.lesson-ai-mode-body small {
  font-size: 12px;
  color: #64748b;
}

.lesson-ai-cards-head {
  font-size: 13px;
  font-weight: 600;
  color: #0f172a;
  padding: 2px 2px 6px;
}

.lesson-ai-taskpicker {
  margin-top: 4px;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  background: #f8fafc;
  padding: 10px;
}
.lesson-ai-taskpicker-head {
  font-size: 12px;
  font-weight: 600;
  color: #0f172a;
  /* 侧栏很窄：标题让出空间给确认/关闭，自己换行即可，别把按钮挤跑 */
  min-width: 0;
}
.lesson-ai-taskpicker-headrow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}
.lesson-ai-taskpicker-tools {
  flex: none;
  display: flex;
  align-items: center;
  gap: 4px;
}
/* 「确认」：小号描边款，与旁边 × 同一行，不抢「作文评讲课」主卡的视觉重量 */
.lesson-ai-taskpicker-ok {
  border: 1px solid #2563eb;
  border-radius: 6px;
  background: #fff;
  color: #2563eb;
  font-size: 12px;
  line-height: 1;
  cursor: pointer;
  padding: 4px 10px;
}
.lesson-ai-taskpicker-ok:hover {
  background: #eff6ff;
}
.lesson-ai-taskpicker-ok:disabled {
  border-color: #dbe3ec;
  color: #b6c0cd;
  background: #fff;
  cursor: not-allowed;
}
.lesson-ai-taskpicker-x {
  border: none;
  background: transparent;
  color: #94a3b8;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  padding: 2px 4px;
}
.lesson-ai-taskpicker-x:hover {
  color: #475569;
}
/* 已选任务摘要：面板收起后列表不再裸露，只在这里留一行任务名。
   左缩进 52px = 按钮 padding-left 12 + 图标 30 + gap 10，
   即摘要左缘正好对齐「作文评讲课」这几个字（不是对齐图标、也不是贴按钮最左边）。 */
.lesson-ai-taskpicked {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: -4px 0 0 52px;
  padding: 5px 10px;
  border-left: 2px solid #cbd5e1;
  border-radius: 0 6px 6px 0;
  background: #f1f5f9;
  font-size: 12px;
  line-height: 1.5;
  color: #475569;
}
.lesson-ai-taskpicked[hidden] { display: none; }
.lesson-ai-taskpicked-label {
  flex: none;
  color: #64748b;
}
.lesson-ai-taskpicked-names {
  min-width: 0;
  color: #0f172a;
  word-break: break-word;
}
.lesson-ai-taskpicker-list {
  display: grid;
  gap: 6px;
  max-height: 220px;
  overflow-y: auto;
}
.lesson-ai-taskpicker-item {
  display: grid;
  gap: 2px;
  width: 100%;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
  padding: 8px 10px;
  text-align: left;
  transition: border-color .15s ease;
}
.lesson-ai-taskpicker-item:hover {
  border-color: #2563eb;
}
.lesson-ai-taskpicker-name {
  font-size: 13px;
  color: #0f172a;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.lesson-ai-taskpicker-meta {
  font-size: 11px;
  color: #64748b;
}
.lesson-ai-taskpicker-empty {
  font-size: 12px;
  color: #64748b;
  padding: 6px 2px;
}
.lesson-ai-taskpicker-cancel {
  width: 100%;
  margin-top: 8px;
  border: none;
  background: transparent;
  color: #64748b;
  font-size: 12px;
  cursor: pointer;
  padding: 4px;
}
.lesson-ai-taskpicker-cancel:hover {
  color: #dc2626;
}
.lesson-ai-taskpicker-item.is-selected {
  border-color: #2563eb;
  background: #eff6ff;
  box-shadow: inset 0 0 0 1px #2563eb;
}
.lesson-ai-taskpicker-item.is-selected .lesson-ai-taskpicker-name {
  color: #1d4ed8;
}
.lesson-ai-taskpicker-more {
  width: 100%;
  border: 1px dashed #cbd5e1;
  border-radius: 8px;
  background: #fff;
  color: #2563eb;
  font-size: 12px;
  cursor: pointer;
  padding: 7px 10px;
}
.lesson-ai-taskpicker-more:hover {
  border-color: #2563eb;
  background: #eff6ff;
}
.lesson-ai-taskpicker-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 10px;
}
.lesson-ai-taskpicker-close {
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  background: #fff;
  color: #64748b;
  font-size: 12px;
  cursor: pointer;
  padding: 7px 10px;
}
.lesson-ai-taskpicker-close:hover {
  color: #dc2626;
  border-color: #dc2626;
}
.lesson-ai-taskpicker-go {
  border: none;
  border-radius: 8px;
  background: #2563eb;
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  padding: 7px 14px;
}
.lesson-ai-taskpicker-go:hover {
  background: #1d4ed8;
}
.lesson-ai-taskpicker-go:disabled {
  opacity: .5;
  cursor: not-allowed;
}

.lesson-ai-extra {
  display: grid;
  gap: 6px;
}

.lesson-ai-extra label {
  font-size: 12px;
  color: #475569;
}

.lesson-ai-extra .lesson-ai-prompt {
  min-height: 72px;
}

.lesson-ai-run {
  width: 100%;
}

.lesson-ai-run:disabled {
  opacity: .55;
  cursor: not-allowed;
}

.lesson-ai-action {
  display: grid;
  gap: 6px;
}

/* 主区切换条 */
.lesson-main {
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0;
}

.lesson-main-tabs {
  display: flex;
  gap: 4px;
  padding: 8px 12px 0;
  border-bottom: 1px solid #e5e9f0;
  flex-shrink: 0;
}

.lesson-main-tabs button {
  border: 0;
  background: transparent;
  color: #64748b;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  padding: 6px 14px;
  border-radius: 8px 8px 0 0;
  border-bottom: 2px solid transparent;
}

.lesson-main-tabs button.is-active {
  color: #2563eb;
  border-bottom-color: #2563eb;
  background: #f0f6ff;
}

.lesson-main-pane {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 14px;
}

.lesson-main-pane[hidden] {
  display: none;
}

/* 主区里的 AI 对话内容区（比侧栏宽，卡片上下排列） */
.lesson-main-pane--ai .lesson-ai-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.lesson-main-pane--ai .lesson-ai-chat {
  flex: 1;
  display: flex;
}

.lesson-main-pane--ai[hidden],
.lesson-main-pane--ai .lesson-ai-chat[hidden] {
  display: none;
}

.lesson-main-pane--ai .lesson-ai-msgs {
  min-height: 220px;
  max-height: none;
  flex: 1;
}

/* 右侧教案展示区 */
.lesson-preview-pane {
  min-width: 320px;
  transition: min-width .2s;
  position: static;
}

.lesson-preview-pane.is-collapsed {
  min-width: 46px;
  overflow: hidden;
  padding: 0;
}

.lesson-preview-pane.is-collapsed .lesson-preview-area,
.lesson-preview-pane.is-collapsed .lesson-preview-headbar {
  display: none;
}

.lesson-preview-headbar {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  flex-wrap: wrap;
  gap: 6px 8px;
  padding: 4px 2px 8px;
  border-bottom: 1px solid #edf2f7;
  margin-bottom: 6px;
}

.lesson-preview-headbar strong {
  color: #0f172a;
  font-size: 15px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
  min-width: 0;
  flex: 0 1 auto;
}

.lesson-ppt-btn {
  border: 1px solid #2337c4;
  background: linear-gradient(135deg, #2456ff 0%, #3b2fd0 100%);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  padding: 5px 14px;
  border-radius: 8px;
  flex-shrink: 0;
  white-space: nowrap;
  box-shadow: 0 3px 10px rgba(36, 86, 255, .35);
}

.lesson-ppt-btn:hover {
  background: linear-gradient(135deg, #1f4bf0 0%, #3427c4 100%);
  border-color: #1f4bf0;
  box-shadow: 0 4px 14px rgba(36, 86, 255, .45);
}

.lesson-ppt-btn:disabled {
  opacity: .6;
  cursor: not-allowed;
}

.lesson-ppt-drop {
  position: relative;
  flex-shrink: 0;
  margin-left: auto;
}

.lesson-ppt-menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 150px;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, .12);
  padding: 4px;
  z-index: 50;
}

.lesson-ppt-menu[hidden] {
  display: none;
}

.lesson-ppt-menu button {
  display: block;
  width: 100%;
  text-align: left;
  border: 0;
  background: transparent;
  color: #334155;
  font-size: 13px;
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
  white-space: nowrap;
}

/* 关键：button 的 display:block 会覆盖 HTML 原生 hidden，需显式隐藏 */
.lesson-ppt-menu button[hidden] {
  display: none;
}

.lesson-ppt-menu button:hover {
  background: #eef2ff;
  color: #1D4ED8;
}

.lesson-preview-close {
  border: 0;
  background: transparent;
  color: #64748b;
  font-size: 18px;
  cursor: pointer;
  line-height: 1;
  padding: 2px 6px;
  flex-shrink: 0;
  margin-left: 6px;
}

.lesson-preview-close:hover {
  color: #b91c1c;
}

.lesson-preview-max {
  border: 0;
  background: transparent;
  color: #475569;
  font-size: 17px;
  cursor: pointer;
  line-height: 1;
  padding: 2px 6px;
  flex-shrink: 0;
  margin-left: 2px;
}
.lesson-preview-max:hover {
  color: #2563eb;
}

.lesson-status-badge {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 600;
  color: #475569;
  background: #f1f5f9;
  border-radius: 99px;
  padding: 2px 8px;
  white-space: nowrap;
}

.lesson-status-badge::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #94a3b8;
  flex-shrink: 0;
}

/* 状态徽章颜色与左侧教案列表状态色呼应 */
.lesson-status-badge.is-draft::before { background: #f5a623; }
.lesson-status-badge.is-draft { background: #fef5e7; color: #b9730e; }
.lesson-status-badge.is-done::before { background: #2e9e63; }
.lesson-status-badge.is-done { background: #e8f7ef; color: #1f7a49; }
.lesson-status-badge.is-stored::before { background: #2f7fd0; }
.lesson-status-badge.is-stored { background: #e8f1fb; color: #1d5fa8; }
.lesson-status-badge.is-archived::before { background: #9aa3ad; }
.lesson-status-badge.is-archived { background: #f0f2f4; color: #6b7280; }
.lesson-status-badge.is-thinking::before { background: #c0c7cd; }
/* 「重新编辑」瞬态：已完成的学案被打开编辑时显示的警示色 */
.lesson-status-badge.is-editing::before { background: #e67e22; }
.lesson-status-badge.is-editing { background: #fdf0e0; color: #c45e0f; }

.lesson-status-actions {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 0;
}

.lesson-status-actions button {
  border: 1px solid #dbe3ef;
  border-radius: 6px;
  background: #fff;
  color: #334155;
  cursor: pointer;
  font-size: 11px;
  line-height: 1;
  padding: 4px 7px;
  white-space: nowrap;
}

.lesson-status-actions button:hover {
  border-color: #2563eb;
  color: #1d4ed8;
}

.lesson-writer-item-meta {
  font-size: 11px;
  color: #64748b;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* 左侧列表状态圆点：与顶部状态徽章同色，形成呼应 */
.lesson-status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #94a3b8;
  flex-shrink: 0;
}

.lesson-status-dot.st-thinking { background: #c0c7cd; }
.lesson-status-dot.st-draft { background: #f5a623; }
.lesson-status-dot.st-done { background: #2e9e63; }
.lesson-status-dot.st-stored { background: #2f7fd0; }
.lesson-status-dot.st-archived { background: #9aa3ad; }
.lesson-status-dot.st-editing { background: #e67e22; }

.lesson-preview-area {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  border: 1px solid #e5e9f0;
  border-radius: 10px;
  background: #fff;
  padding: 10px;
}

.lesson-preview-empty {
  padding: 40px 20px;
  text-align: center;
  color: #94a3b8;
  font-size: 13px;
}

.lesson-preview-doc {
  padding: 20px 24px;
  background: #fff;
  border-radius: 10px;
}

.lesson-preview-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 2px solid #eef2f7;
}

.lesson-preview-title {
  font-size: 20px;
  font-weight: 700;
  color: #0f172a;
  margin: 0;
  line-height: 1.4;
}

.lesson-preview-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.lesson-preview-actions button {
  border: 1px solid #dbe3ef;
  border-radius: 6px;
  background: #fff;
  color: #334155;
  cursor: pointer;
  font-size: 12px;
  padding: 5px 10px;
  white-space: nowrap;
}

.lesson-preview-actions button:hover {
  border-color: #2563eb;
  color: #1d4ed8;
}

.lesson-preview-body {
  font-size: 14px;
  line-height: 1.75;
  color: #1e293b;
}

.lesson-preview-body h1, .lesson-preview-body h2,
.lesson-preview-body h3, .lesson-preview-body h4 {
  margin: 20px 0 8px;
  font-weight: 700;
  line-height: 1.35;
  color: #0f172a;
}

.lesson-preview-body h1 { font-size: 22px; }
.lesson-preview-body h2 { font-size: 19px; padding-bottom: 6px; border-bottom: 1px solid #eef2f7; }
.lesson-preview-body h3 { font-size: 16px; }
.lesson-preview-body h4 { font-size: 14px; }

.lesson-preview-body p {
  margin: 8px 0;
}

.lesson-preview-body ul, .lesson-preview-body ol {
  margin: 8px 0;
  padding-left: 22px;
}

.lesson-preview-body li {
  margin: 4px 0;
}

.lesson-preview-body blockquote {
  margin: 10px 0;
  padding: 8px 14px;
  border-left: 4px solid #94a3b8;
  background: #f8fafc;
  color: #475569;
}

.lesson-preview-body pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 12px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 12px;
  margin: 10px 0;
}

/* 对话里的文档链接提示 */
.lesson-ai-msg-bubble.is-doc {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
}

.lesson-ai-viewlink {
  display: block;
  margin-top: 6px;
  color: #2563eb;
  font-weight: 500;
  text-decoration: none;
}

.lesson-ai-viewlink:hover {
  text-decoration: underline;
}

/* 对话窗口 */
.lesson-ai-chat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 0;
}

.lesson-ai-chat[hidden] {
  display: none;
}

.lesson-ai-msgs {
  flex: 1;
  min-height: 200px;
  max-height: 52vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 4px 2px;
}

.lesson-ai-msg {
  display: flex;
  flex-direction: column;
}

.lesson-ai-msg.is-user {
  align-items: flex-end;
}

.lesson-ai-msg.is-ai {
  align-items: flex-start;
}

.lesson-ai-msg-bubble {
  max-width: 96%;
  padding: 8px 11px;
  border-radius: 10px;
  font-size: 13px;
  line-height: 1.55;
  color: #0f172a;
  overflow-wrap: break-word;
}

.lesson-ai-msg-typewriter {
  white-space: pre-wrap;
  word-break: break-word;
}

.lesson-ai-msg.is-user .lesson-ai-msg-bubble {
  background: #2563eb;
  color: #fff;
}

.lesson-ai-msg.is-ai .lesson-ai-msg-bubble {
  background: #f1f5f9;
  border: 1px solid #e2e8f0;
}

.lesson-ai-msg.is-ai .lesson-ai-msg-bubble.is-error {
  background: #fef2f2;
  border-color: #fecaca;
  color: #b91c1c;
}

.lesson-ai-msg-bubble p {
  margin: 4px 0;
}

.lesson-ai-msg-bubble h1, .lesson-ai-msg-bubble h2,
.lesson-ai-msg-bubble h3, .lesson-ai-msg-bubble h4 {
  margin: 10px 0 4px;
  font-weight: 700;
  line-height: 1.3;
}

.lesson-ai-msg-bubble h1 { font-size: 16px; }
.lesson-ai-msg-bubble h2 { font-size: 15px; }
.lesson-ai-msg-bubble h3 { font-size: 14px; }
.lesson-ai-msg-bubble h4 { font-size: 13px; }

.lesson-ai-msg-bubble ul, .lesson-ai-msg-bubble ol {
  margin: 4px 0;
  padding-left: 20px;
}

.lesson-ai-msg-bubble li {
  margin: 2px 0;
}

.lesson-ai-msg-bubble blockquote {
  margin: 6px 0;
  padding-left: 10px;
  border-left: 3px solid #94a3b8;
  color: #475569;
}

.lesson-ai-msg-bubble.is-user {
  background: #2563eb;
}

.lesson-ai-msg.is-user .lesson-ai-msg-bubble p {
  color: #fff;
}

.lesson-ai-code {
  background: #0f172a;
  color: #e2e8f0;
  padding: 8px;
  border-radius: 6px;
  font-size: 12px;
  overflow-x: auto;
  white-space: pre;
  margin: 6px 0;
}

.lesson-ai-msg-actions {
  display: flex;
  gap: 6px;
  margin-top: 6px;
}

.lesson-ai-msg-actions button {
  border: 1px solid #dbe3ef;
  border-radius: 6px;
  background: #fff;
  color: #334155;
  cursor: pointer;
  font-size: 12px;
  padding: 3px 9px;
}

.lesson-ai-msg-actions button:hover {
  border-color: #2563eb;
  color: #1d4ed8;
}

.lesson-ai-chat-input {
  display: grid;
  gap: 6px;
}

.lesson-ai-chat-input .lesson-ai-actions-row {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.lesson-ai-chat-input .lesson-ai-actions-row .lesson-ai-clear {
  margin-right: auto;
}

.lesson-ai-chat-input .lesson-ai-prompt {
  min-height: 64px;
}

.lesson-ai-msg.is-loading {
  align-items: flex-start;
}

.lesson-ai-msg.is-loading .lesson-ai-msg-bubble {
  background: #f1f5f9;
  display: flex;
  align-items: center;
  gap: 8px;
  color: #64748b;
}

.lesson-ai-msg.is-loading .lesson-ai-spinner {
  margin: 0;
  width: 18px;
  height: 18px;
  border-width: 2px;
}

.lesson-ai-result {
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  background: #fff;
  overflow: hidden;
}

.lesson-ai-result.is-loading {
  padding: 24px 16px;
  text-align: center;
}

.lesson-ai-spinner {
  width: 26px;
  height: 26px;
  margin: 0 auto 12px;
  border: 3px solid #e2e8f0;
  border-top-color: #2563eb;
  border-radius: 50%;
  animation: lesson-ai-spin .8s linear infinite;
}

@keyframes lesson-ai-spin {
  to { transform: rotate(360deg); }
}

.lesson-ai-loading-text {
  font-size: 13px;
  color: #64748b;
}

/* AI 正在生成动效：让气泡明显"活"起来，避免用户误以为死机 */
.lesson-ai-loading-text::after {
  content: "";
  display: inline-block;
  width: 1.1em;
  text-align: left;
  animation: lesson-ai-dots 1.2s steps(4, end) infinite;
}

@keyframes lesson-ai-dots {
  0%   { content: ""; }
  25%  { content: "."; }
  50%  { content: ".."; }
  75%  { content: "..."; }
}

/* 流式输出末尾的闪烁光标 */
.lesson-ai-msg-typewriter::after {
  content: "▍";
  color: #2563eb;
  margin-left: 1px;
  animation: lesson-ai-blink .7s step-end infinite;
}

@keyframes lesson-ai-blink {
  50% { opacity: 0; }
}

.lesson-ai-msg.is-loading .lesson-ai-msg-bubble {
  animation: lesson-ai-pulse 1.4s ease-in-out infinite;
}

@keyframes lesson-ai-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(37, 99, 235, .12); }
  50%      { box-shadow: 0 0 0 6px rgba(37, 99, 235, 0); }
}

/* 生成完成/出错：去掉流式光标的闪烁 */
.lesson-ai-msg.is-done .lesson-ai-msg-typewriter::after,
.lesson-ai-msg.is-error .lesson-ai-msg-typewriter::after {
  content: none;
}

.lesson-ai-result.is-error {
  padding: 14px;
}

.lesson-ai-error {
  font-size: 13px;
  color: #b91c1c;
  line-height: 1.6;
}

.lesson-ai-result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  border-bottom: 1px solid #eef2f7;
  font-size: 13px;
  font-weight: 500;
  color: #0f172a;
}

.lesson-ai-result-actions {
  display: flex;
  gap: 6px;
  flex: 0 0 auto;
}

.lesson-ai-result-actions button {
  border: 1px solid #dbe3ef;
  border-radius: 6px;
  background: #fff;
  color: #334155;
  cursor: pointer;
  font-size: 12px;
  padding: 4px 8px;
  transition: border-color .15s ease, color .15s ease;
}

.lesson-ai-result-actions button:hover {
  border-color: #2563eb;
  color: #1d4ed8;
}

.lesson-ai-result-actions button:first-child {
  border-color: #2563eb;
  background: #2563eb;
  color: #fff;
}

.lesson-ai-result-actions button:first-child:hover {
  background: #1d4ed8;
  border-color: #1d4ed8;
}

.lesson-ai-result-body {
  max-height: 320px;
  overflow-y: auto;
  padding: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: #334155;
  white-space: pre-wrap;
  word-break: break-word;
}

.lesson-ai-refs {
  border: 1px dashed #cbd5e1;
  border-radius: 10px;
  background: #fbfcfe;
  padding: 8px;
}

.lesson-ai-refs-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  border: none;
  background: transparent;
  color: #2563eb;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  padding: 4px 6px;
}

.lesson-ai-refs-toggle:hover {
  color: #1d4ed8;
}

.lesson-ai-refs-count {
  display: inline-grid;
  place-items: center;
  min-width: 20px;
  height: 20px;
  border-radius: 10px;
  background: #e0e7ff;
  color: #4f46e5;
  font-size: 12px;
}

.lesson-ai-refs-panel {
  margin-top: 6px;
  display: grid;
  gap: 8px;
  position: relative;
  z-index: 5;
  background: inherit;
}

/* hidden 属性优先级低于 display:grid，需显式覆盖，否则折叠按钮点了不生效 */
.lesson-ai-refs-panel[hidden] {
  display: none;
}

.lesson-ai-refs-hint {
  font-size: 12px;
  color: #64748b;
  line-height: 1.6;
  margin: 0;
}

.lesson-ai-refs-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.lesson-ai-refs-actions button {
  border: 1px solid #dbe3ef;
  border-radius: 6px;
  background: #fff;
  color: #334155;
  cursor: pointer;
  font-size: 12px;
  padding: 5px 9px;
}

.lesson-ai-refs-actions button:hover {
  border-color: #2563eb;
  color: #1d4ed8;
}

.lesson-ai-library {
  margin-top: 8px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
  overflow: hidden;
}

.lesson-ai-library-head {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px;
  border-bottom: 1px solid #f0f1f3;
}

.lesson-ai-library-head input {
  flex: 1;
  min-width: 0;
  border: 1px solid #dbe3ef;
  border-radius: 6px;
  font-size: 12px;
  padding: 5px 8px;
  color: #0f172a;
}

.lesson-ai-library-head button {
  border: 0;
  background: transparent;
  color: #64748b;
  font-size: 16px;
  cursor: pointer;
  line-height: 1;
  padding: 2px 6px;
}

.lesson-ai-library-list {
  max-height: 260px;
  overflow-y: auto;
  padding: 4px;
}

.lesson-ai-library-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 7px 8px;
  border-radius: 6px;
  cursor: pointer;
}

.lesson-ai-library-item:hover {
  background: #f8fafc;
}

.lesson-ai-library-item.is-added {
  background: #eff6ff;
}

.lesson-ai-library-check {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 1px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #cbd5e1;
  border-radius: 4px;
  color: #fff;
  font-size: 13px;
  line-height: 1;
  background: #fff;
}

.lesson-ai-library-item.is-added .lesson-ai-library-check {
  border-color: #2563eb;
  background: #2563eb;
}

.lesson-ai-library-item-body {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.lesson-ai-library-item-body strong {
  font-size: 13px;
  color: #0f172a;
  font-weight: 600;
  line-height: 1.4;
}

.lesson-ai-library-item-body small {
  font-size: 12px;
  color: #64748b;
  line-height: 1.4;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.lesson-ai-library-empty {
  padding: 16px;
  text-align: center;
  font-size: 12px;
  color: #94a3b8;
}


.lesson-ai-refs-input {
  display: grid;
  gap: 6px;
}

.lesson-ai-refs-input label {
  font-size: 12px;
  color: #475569;
}

.lesson-ai-refs-input textarea {
  min-height: 84px;
  resize: vertical;
  border: 1px solid #dbe3ef;
  border-radius: 8px;
  color: #0f172a;
  font-size: 13px;
  line-height: 1.6;
  padding: 8px;
}

.lesson-ai-refs-input-actions {
  display: flex;
  gap: 6px;
}

.lesson-ai-refs-hintrow {
  margin-top: 8px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

/* 有资料时这一行让位给资料条目：提示语收起 */
.lesson-ai-refs-hintrow.has-items .lesson-ai-refs-hint {
  display: none;
}

.lesson-ai-refs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  padding-top: 6px;
  min-width: 0;
}

/* 单条参考资料：点名称预览 + 右上角 × 取消引用 */
.lesson-ai-ref-item {
  position: relative;
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  border: 1px solid #dbe3ef;
  background: #fff;
  border-radius: 8px;
  padding: 4px 10px 4px 8px;
  box-shadow: 0 1px 2px rgba(16, 24, 40, .04);
}

.lesson-ai-ref-item-name {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 0;
  color: #334155;
  font-size: 12px;
  font-weight: 600;
}

.lesson-ai-ref-item-name:hover {
  color: #1d4ed8;
}

.lesson-ai-ref-item-name:disabled {
  cursor: default;
  color: #64748b;
}

.lesson-ai-ref-item-text {
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-ai-ref-item-ico {
  width: 14px;
  height: 18px;
  flex-shrink: 0;
  border-radius: 2px;
  background: #64748b;
  position: relative;
}

.lesson-ai-ref-item-ico::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  border-width: 4px;
  border-style: solid;
  border-color: #fff #fff rgba(255, 255, 255, 0) rgba(255, 255, 255, 0);
}

.lesson-ai-ref-item.is-file .lesson-ai-ref-item-ico {
  background: #2B579A;
}

.lesson-ai-ref-item-del {
  position: absolute;
  top: -6px;
  right: -6px;
  width: 16px;
  height: 16px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid #dbe3ef;
  border-radius: 50%;
  background: #fff;
  color: #94a3b8;
  font-size: 12px;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(16, 24, 40, .08);
}

.lesson-ai-ref-item-del:hover {
  color: #b91c1c;
  border-color: #fecaca;
  background: #fef2f2;
}

.lesson-ai-ref-item-del:focus-visible {
  outline: 2px solid #93c5fd;
  outline-offset: 1px;
}

/* 独立「引用我的资料」选择页 */
.lesson-ref-picker {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 760px;
  margin: 0 auto;
  padding: 16px 20px;
  box-sizing: border-box;
}
.lesson-ref-picker-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid #eef0f4;
}
.lesson-ref-picker-back {
  font-size: 22px;
  text-decoration: none;
  color: #64748b;
  line-height: 1;
  padding: 0 6px;
}
.lesson-ref-picker-title h1 { font-size: 16px; font-weight: 600; color: #0f172a; margin: 0; }
.lesson-ref-picker-title p { font-size: 12px; color: #64748b; margin: 2px 0 0; }
.lesson-ref-picker-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
}
.lesson-ref-picker-search {
  flex: 1;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 13px;
}
.lesson-ref-picker-search:focus { border-color: #2563eb; outline: none; }
.lesson-ref-picker-count { font-size: 12px; color: #2563eb; white-space: nowrap; }
.lesson-ref-picker-list {
  flex: 1;
  overflow-y: auto;
  display: grid;
  gap: 8px;
  align-content: start;
  padding-bottom: 8px;
}
.lesson-ref-picker-loading, .lesson-ref-picker-empty {
  font-size: 13px;
  color: #94a3b8;
  text-align: center;
  padding: 32px 0;
}
.lesson-ref-picker-item {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  background: #fff;
  padding: 10px 12px;
  cursor: pointer;
  transition: border-color .15s ease;
}
.lesson-ref-picker-item:hover { border-color: #2563eb; }
.lesson-ref-picker-item.is-on { border-color: #2563eb; background: #eff6ff; }
.lesson-ref-picker-check {
  width: 18px; height: 18px;
  flex-shrink: 0;
  border: 1px solid #cbd5e1;
  border-radius: 5px;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; color: #fff;
}
.lesson-ref-picker-item.is-on .lesson-ref-picker-check { background: #2563eb; border-color: #2563eb; }
.lesson-ref-picker-item-body { min-width: 0; }
.lesson-ref-picker-item-body strong { display: block; font-size: 13px; color: #0f172a; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lesson-ref-picker-item-body small { display: block; font-size: 12px; color: #64748b; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lesson-ref-picker-foot {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid #eef0f4;
}

.lesson-ai-ref-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid #c7d2fe;
  background: #eef2ff;
  color: #3730a3;
  border-radius: 14px;
  font-size: 12px;
  padding: 3px 8px 3px 10px;
  max-width: 100%;
}

.lesson-ai-ref-chip button {
  border: none;
  background: transparent;
  color: #6366f1;
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  padding: 0 2px;
}

.lesson-ai-ref-chip button:hover {
  color: #4338ca;
}

.lesson-ai-ref-filecard {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  max-width: 100%;
  border: 1px solid #dbe3ef;
  background: #fff;
  border-radius: 8px;
  padding: 2px 4px 2px 6px;
  box-shadow: 0 1px 2px rgba(16, 24, 40, .04);
}

.lesson-ai-ref-filecard-main {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  color: #334155;
  text-decoration: none;
}

.lesson-ai-ref-filecard-main:hover {
  color: #1d4ed8;
}

.lesson-ai-ref-filecard-ico {
  width: 16px;
  height: 20px;
  flex-shrink: 0;
  border-radius: 2px;
  background: #2B579A;
  position: relative;
}

.lesson-ai-ref-filecard-ico::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  border-width: 5px;
  border-style: solid;
  border-color: #fff #fff rgba(255, 255, 255, 0) rgba(255, 255, 255, 0);
}

.lesson-ai-ref-filecard-name {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 12px;
  font-weight: 600;
  max-width: 200px;
}

.lesson-ai-ref-filecard-del {
  flex-shrink: 0;
  border: none;
  background: transparent;
  color: #9aa3af;
  cursor: pointer;
  font-size: 15px;
  line-height: 1;
  padding: 0 2px;
}

.lesson-ai-ref-filecard-del:hover {
  color: #b91c1c;
}

.lesson-ai-preview-overlay {
  position: fixed;
  inset: 0;
  z-index: 1200;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lesson-ai-preview-overlay[hidden] {
  display: none;
}

.lesson-ai-preview-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, .5);
}

.lesson-ai-preview-dialog {
  position: relative;
  width: min(780px, 92vw);
  max-height: 86vh;
  display: flex;
  flex-direction: column;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 20px 50px rgba(15, 23, 42, .3);
  overflow: hidden;
}

.lesson-ai-preview-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid #eef1f5;
}

.lesson-ai-preview-head strong {
  font-size: 15px;
  color: #0f172a;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-ai-preview-close {
  border: 0;
  background: transparent;
  color: #64748b;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  padding: 0 4px;
  flex-shrink: 0;
}

.lesson-ai-preview-close:hover {
  color: #b91c1c;
}

.lesson-ai-preview-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 16px 20px;
  max-height: calc(86vh - 48px);
  font-size: 14px;
  line-height: 1.7;
  color: #1f2937;
}

.lesson-ai-preview-loading,
.lesson-ai-preview-error {
  padding: 30px 10px;
  text-align: center;
  color: #64748b;
}

.lesson-ai-preview-error {
  color: #b91c1c;
}

.lesson-ai-preview-imgwrap {
  text-align: center;
}

/* frame 模式（PDF / Word / PPT 需保留原文件版式）：浮层放大，正文区不留内边距，由 iframe 铺满 */
.lesson-ai-preview-dialog.is-frame {
  width: min(1100px, 96vw);
  height: 90vh;
  max-height: 90vh;
}

.lesson-ai-preview-dialog.is-frame .lesson-ai-preview-body {
  padding: 0;
  overflow: hidden;
  max-height: none;
}

.lesson-ai-preview-frame {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: #fff;
}

.ppt-result {
  text-align: center;
  padding: 12px 4px;
}

.ppt-result-count {
  font-size: 16px;
  color: #1F2937;
  margin: 0 0 18px;
}

.ppt-result-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.ppt-result-actions .btn {
  font-size: 15px;
  padding: 9px 18px;
}

.ppt-result-hint {
  margin-top: 20px;
  font-size: 12px;
  color: #6B7280;
}

.lesson-ai-photo-qr {
  display: grid;
  gap: 8px;
  justify-items: center;
  padding: 10px;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  background: #fff;
  text-align: center;
}

.lesson-ai-photo-qr[hidden] {
  display: none;
}

.lesson-ai-photo-qr img {
  width: 120px;
  height: 120px;
  border-radius: 8px;
}

.lesson-photo-open {
  color: #2563eb;
  font-size: 12px;
  text-decoration: none;
}

.lesson-photo-open:hover {
  text-decoration: underline;
}

.lesson-ai-panel strong {
  display: block;
  margin-bottom: 2px;
  color: #0f172a;
  font-size: 14px;
}

.lesson-ai-panel span {
  color: #64748b;
  font-size: 13px;
}

.lesson-ai-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.lesson-ai-actions button {
  border: 1px solid #cbd5e1;
  border-radius: 5px;
  background: #fff;
  color: #334155;
  cursor: pointer;
  font-size: 13px;
  padding: 6px 10px;
}

.lesson-ai-actions button:hover {
  border-color: #2563eb;
  color: #1d4ed8;
}

.lesson-readonly-text {
  min-height: 360px;
  padding: var(--space-4);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  background: #fafafa;
  color: var(--color-neutral-800);
  line-height: var(--leading-relaxed);
  white-space: pre-wrap;
}

/* 教案撰写主入口：编辑器优先的三栏工作台 */
.app-main:has(.lesson-writer-page) {
  max-width: none;
  width: 100%;
  min-height: 100vh;
  padding: 0;
}

.lesson-writer-page {
  width: 100%;
  max-width: none;
  height: 100vh;
  overflow: hidden;
  background: #fff;
}

.lesson-writer-shell {
  display: grid;
  grid-template-columns: 300px minmax(620px, 1fr);
  height: 100vh;
  min-height: 0;
}

.lesson-writer-list {
  display: grid;
  grid-template-rows: auto auto auto minmax(0, 1fr) auto;
  gap: 0;
  min-width: 0;
  height: 100vh;
  border-right: 1px solid #edf0f4;
  background: #fafafa;
  overflow: hidden;
}

.lesson-writer-list-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 54px;
  padding: 0 14px;
}

.lesson-writer-list-top form {
  margin: 0;
}

.lesson-writer-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: #111827;
  cursor: pointer;
  font-size: 21px;
  line-height: 1;
  text-decoration: none;
}

.lesson-writer-icon:hover {
  background: #eef2f7;
}

.lesson-writer-section-title {
  padding: 10px 16px 8px;
  color: #111827;
  font-size: 15px;
  font-weight: 800;
}

.lesson-writer-date-title {
  padding: 12px 16px 8px;
  color: #9ca3af;
  font-size: 13px;
  font-weight: 650;
}

.lesson-writer-items {
  min-height: 0;
  overflow-y: auto;
  padding: 0 8px 12px;
}

.lesson-writer-item {
  display: grid;
  gap: 6px;
  padding: 12px 12px;
  border-radius: 8px;
  color: #111827;
  text-decoration: none;
  position: relative;
}

.lesson-writer-item-link {
  display: grid;
  gap: 6px;
  color: inherit;
  text-decoration: none;
}

.lesson-writer-item:hover,
.lesson-writer-item.active {
  background: #eaf5ef;
}

.lesson-writer-item strong {
  overflow: hidden;
  color: #111827;
  font-size: 15px;
  font-weight: 800;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-writer-item span {
  display: -webkit-box;
  overflow: hidden;
  color: #8b949e;
  font-size: 13px;
  line-height: 1.45;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

/* 摘要固定占两行，保证列表项高度一致，避免切换时上下跳动 */
.lesson-writer-item .lesson-writer-item-excerpt {
  min-height: 38px;
  -webkit-line-clamp: 2;
  display: -webkit-box;
  overflow: hidden;
  -webkit-box-orient: vertical;
}

.lesson-writer-empty {
  padding: 18px 12px;
  color: #9ca3af;
  font-size: 13px;
}

.lesson-writer-manage {
  display: flex;
  align-items: center;
  height: 44px;
  padding: 0 16px;
  border-top: 1px solid #edf0f4;
  color: #334155;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}

.lesson-writer-manage:hover {
  color: #0057ff;
}

.lesson-editor--workspace {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) 10px 60%;
  gap: 0;
  min-width: 0;
  height: 100vh;
  min-height: 0;
  overflow: hidden;
}

.lesson-editor--workspace .lesson-editor-main {
  min-height: 0;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  overflow-y: auto;
}

.lesson-editor--workspace .lesson-preview-area {
  border: 0;
  border-radius: 0;
  padding: 0;
  background: #fff;
}

.lesson-editor--workspace .lesson-wang-editor {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-height: 100vh;
  border-radius: 0;
}

.lesson-editor--workspace .lesson-editor-toolrow {
  position: sticky;
  top: 0;
  z-index: 36;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
  min-height: 46px;
  padding: 0 18px 0 12px;
  border-bottom: 1px solid #f0f1f3;
  background: #ffffff;
  overflow: visible;
}

.lesson-editor-tools {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  justify-content: flex-end;
  min-width: 0;
  white-space: nowrap;
  overflow: visible;
}

.lesson-tool-menu {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.lesson-tool-button {
  height: 30px;
  border: 1px solid #e5e7eb;
  border-radius: 6px;
  background: #fff;
  color: #334155;
  font-size: 13px;
  font-weight: 700;
  line-height: 28px;
  padding: 0 10px;
  cursor: pointer;
  white-space: nowrap;
}

.lesson-tool-button::after {
  content: "";
  display: inline-block;
  width: 0;
  height: 0;
  margin-left: 5px;
  border-top: 4px solid #64748b;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  vertical-align: middle;
}

.lesson-export-word::after {
  display: none;
}

.lesson-preview-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  height: 30px;
}

.lesson-preview-btn::after {
  display: none;
}

.lesson-preview-btn:hover {
  color: #1d4ed8;
  border-color: #bfdbfe;
  background: #eff6ff;
}

.lesson-tool-popover {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 2100;
  min-width: 150px;
  max-width: 240px;
  max-height: 320px;
  overflow-y: auto;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 16px 32px rgba(15, 23, 42, .14);
  padding: 6px;
}

.lesson-tool-popover button {
  display: block;
  width: 100%;
  min-height: 30px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: #334155;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.35;
  padding: 6px 9px;
  text-align: left;
  white-space: nowrap;
}

.lesson-tool-button:hover,
.lesson-tool-popover button:hover,
.lesson-tool-popover button.is-active {
  border-color: #94a3b8;
  background: #f8fafc;
}

.lesson-tool-popover button.is-active {
  color: #0f766e;
}

.lesson-tool-button:disabled,
.lesson-export-word:disabled {
  cursor: wait;
  opacity: .65;
}

/* 更多工具「»」溢出菜单 */
.lesson-more-menu .lesson-tool-button::after {
  display: none;
}
.lesson-more-popover {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 2100;
  min-width: 170px;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 2px;
  max-height: 360px;
  overflow-y: auto;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 16px 32px rgba(15, 23, 42, .14);
  padding: 6px;
}
.lesson-more-popover .lesson-tool-menu {
  display: flex;
  flex-direction: column;
  align-items: stretch;
}
.lesson-more-popover .lesson-tool-button {
  width: 100%;
  justify-content: flex-start;
  border: 0;
  border-radius: 6px;
  background: transparent;
  text-align: left;
}
.lesson-more-popover .lesson-tool-button:hover {
  background: #f8fafc;
}
.lesson-more-popover .lesson-tool-button::after {
  display: none;
}
.lesson-more-popover .lesson-autosave-status,
.lesson-more-popover .lesson-word-count {
  display: block;
  padding: 6px 9px;
  font-size: 13px;
  color: #8b949e;
}

.lesson-editor--workspace .lesson-wang-toolbar {
  position: static;
  min-width: 0;
  grid-column: 1;
  overflow-x: visible;
  overflow-y: visible;
  padding-left: 0;
  border: 0;
  background: transparent;
  z-index: 60;
}

.lesson-editor--workspace .lesson-wang-toolbar .w-e-bar {
  flex-wrap: wrap !important;
  min-height: 44px;
  width: 100%;
  min-width: 0;
  padding: 3px 0 !important;
  overflow: visible !important;
  background: transparent;
}

.lesson-editor--workspace .lesson-wang-toolbar .w-e-drop-panel,
.lesson-editor--workspace .lesson-wang-toolbar .w-e-select-list,
.lesson-editor--workspace .lesson-wang-toolbar .w-e-modal,
.lesson-editor--workspace .lesson-wang-toolbar .w-e-bar-item-menus-container,
.lesson-editor--workspace .lesson-wang-toolbar .w-e-hover-bar {
  z-index: 2000 !important;
}

.lesson-document-canvas {
  min-height: 0;
  overflow-y: auto;
  padding: 42px 64px 110px;
}

.lesson-document-title {
  display: block;
  width: min(980px, 100%);
  margin: 0 auto 18px;
  border: 0;
  outline: none;
  background: transparent;
  color: #111827;
  font-size: 24px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0;
}

.lesson-document-title::placeholder {
  color: #c4c4c4;
  font-weight: 600;
}

.lesson-editor--workspace .lesson-wang-body {
  min-height: 0;
}

.lesson-editor--workspace .lesson-wang-body .w-e-text-container,
.lesson-editor--workspace .lesson-wang-body .w-e-scroll {
  min-height: calc(100vh - 220px) !important;
}

.lesson-editor--workspace .lesson-wang-body [data-slate-editor="true"] {
  max-width: 980px;
  min-height: calc(100vh - 260px);
  margin: 0 auto;
  padding: 0 0 80px !important;
  color: #1f2937;
  font-size: 18px;
  line-height: 1.9;
}

.lesson-editor--workspace .lesson-wang-body [data-slate-editor="true"] h1 {
  font-size: 30px;
  line-height: 1.35;
}

.lesson-editor--workspace .lesson-wang-body [data-slate-editor="true"] h2 {
  margin-top: 1.25em;
  font-size: 24px;
  line-height: 1.4;
}

.lesson-editor--workspace .lesson-wang-body table {
  font-size: 16px;
}

.lesson-editor--workspace .lesson-column-resizer {
  min-height: 100vh;
  background: transparent;
}

.lesson-editor--workspace .lesson-column-resizer::before {
  top: 0;
  bottom: 0;
  left: 4px;
  width: 1px;
  background: #edf0f4;
}

.lesson-editor--workspace .lesson-ai-sidebar {
  position: static;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  align-self: stretch;
  min-width: 0;
  width: 100%;
  max-height: none;
  height: 100vh;
  padding: 18px 20px;
  border: 0;
  border-left: 1px solid #edf0f4;
  border-radius: 0;
  background: #fff;
  box-shadow: none;
}

.lesson-editor--workspace .lesson-ai-sidebar-head {
  padding-bottom: 16px;
  border-bottom: 0;
}

.lesson-editor--workspace .lesson-ai-sidebar-head strong {
  font-size: 18px;
}

.lesson-editor--workspace .lesson-ai-sidebar-head span {
  color: #4b5563;
  font-size: 14px;
}

.lesson-editor--workspace .lesson-ai-sidebar-actions {
  gap: 12px;
}

.lesson-editor--workspace .lesson-ai-sidebar-actions button {
  min-height: 58px;
  padding: 12px 14px;
  border-color: #e5e7eb;
  border-radius: 10px;
  background: #fafafa;
  color: #374151;
  font-size: 14px;
  line-height: 1.55;
}

.lesson-editor--workspace .lesson-ai-prompt {
  min-height: 120px;
  height: 100%;
  margin-top: 12px;
  border: 0;
  border-top: 1px solid #f0f1f3;
  border-radius: 0;
  padding: 20px 0;
  resize: none;
}

@media (max-width: 1280px) {
  .lesson-editor--workspace .lesson-editor-toolrow {
    grid-template-columns: minmax(0, 1fr) auto;
    padding-left: 12px;
    padding-right: 14px;
  }

  .lesson-tool-button {
    padding: 0 8px;
  }

  .lesson-autosave-status {
    display: none;
  }
}

.lesson-preview {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-neutral-100);
}

.lesson-preview summary {
  cursor: pointer;
  color: var(--color-neutral-600);
  font-weight: 700;
}

.report-section-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  justify-content: flex-end;
}

@media (max-width: 900px) {
  .lesson-page {
    padding: var(--space-3);
  }

  .lesson-head,
  .lesson-detail-head,
  .lesson-toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .lesson-shell,
  .lesson-editor {
    grid-template-columns: 1fr;
  }

  .lesson-editor--split {
    grid-template-columns: 1fr !important;
  }

  .lesson-writer-page {
    height: auto;
    min-height: 100vh;
    overflow: visible;
  }

  .lesson-writer-shell,
  .lesson-editor--workspace {
    display: block;
    height: auto;
    min-height: 100vh;
    overflow: visible;
  }

  .lesson-writer-list {
    height: auto;
    max-height: 260px;
    border-right: 0;
    border-bottom: 1px solid #edf0f4;
  }

  .lesson-editor--workspace .lesson-editor-main {
    overflow: visible;
  }

  .lesson-editor--workspace .lesson-editor-toolrow {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
    padding: 0 10px;
  }

  .lesson-editor-tools {
    grid-column: 1 / -1;
    justify-content: flex-start;
    padding: 0 0 6px 0;
  }

  .lesson-editor--workspace .lesson-wang-toolbar {
    top: 0;
    padding-left: 0;
  }

  .lesson-document-canvas {
    padding: 28px 16px 80px;
  }

  .lesson-document-title {
    max-width: none;
    font-size: 20px;
  }

  .lesson-editor--workspace .lesson-wang-body [data-slate-editor="true"] {
    max-width: none;
    min-height: 460px;
    padding: 0 0 80px !important;
    font-size: 16px;
  }

  .lesson-editor-top {
    grid-template-columns: 1fr;
  }

  .lesson-column-resizer {
    display: none;
  }

  .lesson-ai-sidebar {
    position: static;
    max-height: none;
  }

  .lesson-tree {
    max-height: 240px;
    border-right: 0;
    border-bottom: 1px solid var(--color-neutral-200);
  }

  .lesson-linkbar,
  .lesson-actions,
  .lesson-search {
    flex-direction: column;
  }

  .lesson-ai-panel,
  .lesson-preview-head-actions {
    align-items: stretch;
    flex-direction: column;
  }
}

/* ============ 知识库三栏布局（kb-*，蓝调） ============ */
.kb-page {
  min-height: 100vh;
  background: #f5f7fa;
}
.kb-shell {
  display: grid;
  grid-template-columns: 300px 380px minmax(0, 1fr);
  min-height: 100vh;
  border: 0;
  border-radius: 0;
  background: #f5f7fa;
}

/* 第一栏：系统目录 */
.kb-sidebar {
  background: #f2f4f7;
  border-right: 1px solid #e3e8ef;
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.kb-back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid #dfe5ee;
  border-radius: 8px;
  color: #5b6b7c;
  font-size: 16px;
  text-decoration: none;
}
.kb-back:hover { color: #3474f4; border-color: #5a97f8; }
.kb-search input {
  width: 100%;
  height: 40px;
  padding: 0 12px;
  border: 1px solid #dfe5ee;
  border-radius: 8px;
  background: #fff;
  font-size: 13px;
  color: #33415c;
  outline: none;
}
.kb-search input {
  font-size: 14px;
}
.kb-search input:focus { border-color: #5a97f8; }
.kb-sidebar-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
  font-weight: 600;
  color: #33415c;
  padding: 2px 2px 0;
}
.kb-add-sys {
  width: 22px;
  height: 22px;
  border: 1px solid #dfe5ee;
  border-radius: 6px;
  background: #fff;
  color: #5b6b7c;
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
}
.kb-add-sys:hover { border-color: #5a97f8; color: #3474f4; }
.kb-sys-group { margin-bottom: 2px; }
/* 系统目录之间用淡横线隔开（只隔在相邻系统目录之间，第一个上方不加线） */
.kb-sys-group + .kb-sys-group {
  border-top: 1px dashed #e4e9f1;
  margin-top: 6px;
  padding-top: 6px;
}
.kb-sys-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 12px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 15px;
  color: #26344b;
}
.kb-sys-row:hover { background: #e8edf4; }
.kb-sys-caret { color: #8a99ad; font-size: 14px; width: 16px; text-align: center; }
.kb-sys-name { flex: 1; font-weight: 700; letter-spacing: .3px; }
.kb-sys-count { color: #8a99ad; font-size: 13px; }
.kb-sys-children {
  margin-left: 22px;
  padding-left: 12px;
  border-left: 1px solid #e0e6ef;
}
.kb-l1-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 13px;
  color: #5a6b82;
}
.kb-l1-row:hover { background: #e8edf4; }
.kb-l1-row--active { background: #dbe8fd; }
.kb-l1-row--active .kb-l1-name { color: #1845c0; font-weight: 600; }
.kb-l1-dot {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #6a9bf0;
}
.kb-l1-name { color: inherit; text-decoration: none; flex: 1; }
.kb-trash {
  margin-top: auto;
  color: #8a99ad;
  font-size: 13px;
  text-decoration: none;
}
.kb-trash:hover { color: #3474f4; }

/* 第二栏：二级文件夹 */
.kb-middle {
  background: #fff;
  border-right: 1px solid #e3e8ef;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
.kb-middle-head {
  padding: 16px 20px;
  border-bottom: 1px solid #eef1f5;
}
.kb-crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  margin-bottom: 12px;
}
.kb-crumb-sys { color: #8a99ad; }
.kb-crumb-sep { color: #c2cbd6; }
.kb-crumb-l1 { color: #33415c; font-weight: 600; }
.kb-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 32px;
  padding: 0 12px;
  border: 1px solid #dfe5ee;
  border-radius: 8px;
  background: #fff;
  color: #4a5b70;
  font-size: 13px;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}
.kb-btn:hover { border-color: #5a97f8; color: #3474f4; }
.kb-btn--primary {
  background: #3474f4;
  border-color: #3474f4;
  color: #fff;
  font-weight: 600;
}
.kb-btn--primary:hover { background: #1e5bd6; border-color: #1e5bd6; color: #fff; }
.kb-btn input[type="file"] { display: none; }
.kb-sub-grid { padding: 14px 16px; display: grid; grid-template-columns: 1fr 1fr; gap: 10px; overflow-y: auto; }
.kb-sub-empty { padding: 40px 16px; text-align: center; color: #9aa6b8; font-size: 13px; }
.kb-sub-card { border: 1px solid #e6ebf2; border-radius: 12px; overflow: hidden; transition: border-color .15s, box-shadow .15s; }
.kb-sub-card:hover { border-color: #bcd6fc; box-shadow: 0 2px 12px rgba(52,116,244,.08); }
.kb-sub-card--active { border-color: #5a97f8; box-shadow: 0 0 0 1.5px #5a97f8; }
.kb-sub-main { display: flex; flex-direction: column; align-items: center; gap: 8px; padding: 18px 12px; text-decoration: none; }
.kb-sub-icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: #dbe8fd;
  position: relative;
}
.kb-sub-icon::before {
  content: '';
  position: absolute;
  left: 10px; top: 12px;
  width: 20px; height: 14px;
  border-radius: 3px 3px 4px 4px;
  background: #5a97f8;
}
.kb-sub-icon::after {
  content: '';
  position: absolute;
  left: 10px; top: 8px;
  width: 9px; height: 6px;
  border-radius: 2px 2px 0 0;
  background: #8ebbfb;
}
.kb-sub-name { font-size: 13px; font-weight: 500; color: #33415c; text-align: center; }
.kb-sub-count { font-size: 12px; color: #8a99ad; }

/* 第三栏：文件列表 */
.kb-files {
  background: #f5f7fa;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-width: 0;
}
.kb-files-head {
  padding: 10px 14px;
  background: #fff;
  border-bottom: 1px solid #eef1f5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.kb-files-title { display: flex; align-items: center; gap: 8px; min-width: 0; }
.kb-files-name { font-size: 18px; font-weight: 600; color: #33415c; }
.kb-files-count { background: #eef2f8; color: #5b6b7c; font-size: 12px; padding: 2px 10px; border-radius: 999px; }
.kb-files-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.kb-files-add { display: inline-flex; align-items: center; flex-shrink: 0; gap: 6px; }
.kb-files-add-hint { font-size: 12px; color: #9aa6b8; white-space: nowrap; }

/* 主顶栏全局搜索框 */
.kb-global-search {
  position: relative;
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 0 1 200px;
  min-width: 130px;
  max-width: 280px;
}
.kb-global-search-ico {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 15px;
  height: 15px;
  color: #94a3b8;
  pointer-events: none;
}
.kb-global-search input {
  flex: 1 1 auto;
  min-width: 0;
  padding: 7px 12px 7px 33px;
  border: 1px solid #d6deeb;
  border-radius: 8px;
  background: #f8fafc;
  font-size: 13px;
  color: #1f2937;
  outline: none;
  transition: border-color .15s ease, background .15s ease, box-shadow .15s ease;
}
.kb-global-search input:focus {
  border-color: #5a97f8;
  background: #fff;
  box-shadow: 0 0 0 3px rgba(90, 151, 248, .15);
}
.kb-global-search input::placeholder { color: #9aa5b1; }
.kb-global-search button {
  padding: 7px 14px;
  border-radius: 8px;
  border: 1px solid #1a56db;
  background: #1a56db;
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  flex-shrink: 0;
  transition: background .15s ease, border-color .15s ease;
}
.kb-global-search button:hover { background: #1e40af; border-color: #1e40af; }
.kb-global-search-clear {
  position: absolute;
  right: 86px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #94a3b8;
  font-size: 14px;
  line-height: 1;
  text-decoration: none;
}
.kb-global-search-clear:hover { background: #eef1f6; color: #ef4444; }
.kb-linkbar { display: flex; align-items: center; gap: 6px; }
.kb-linkbar input {
  height: 32px;
  width: 200px;
  padding: 0 10px;
  border: 1px solid #dfe5ee;
  border-radius: 8px;
  font-size: 13px;
  outline: none;
  color: #33415c;
}
.kb-linkbar input:focus { border-color: #5a97f8; }
.kb-file-list { flex: 1; padding: 20px 24px; overflow-y: auto; position: relative; }
.kb-drop-hover .kb-file-row { border-color: #a9c8fc; box-shadow: 0 0 0 1px rgba(90,151,248,.18); }
.kb-file-empty { color: #9aa6b8; font-size: 13px; padding: 40px; text-align: center; }
/* 拖拽上传「正在上传中」loading 提示 */
.kb-upload-loading {
  position: fixed; top: 18px; left: 50%; transform: translateX(-50%);
  z-index: 200; display: flex; align-items: center; gap: 10px;
  padding: 12px 20px; border-radius: 10px;
  background: #1f2937; color: #fff; font-size: 14px;
  box-shadow: 0 6px 24px rgba(0,0,0,.18);
  max-width: min(88vw, 560px);
}
.kb-upload-loading-spin {
  width: 16px; height: 16px; flex-shrink: 0; border-radius: 50%;
  border: 2px solid rgba(255,255,255,.3); border-top-color: #fff;
  animation: kb-upload-spin .8s linear infinite;
}
.kb-upload-loading-text { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
@keyframes kb-upload-spin { to { transform: rotate(360deg); } }

.kb-file-row {
  display: grid;
  grid-template-columns: 24px minmax(0,1fr) 110px 130px 90px;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  background: #fff;
  border: 1px solid #e6ebf2;
  margin-bottom: 8px;
  border-radius: 10px;
  position: relative;
}
/* 当前操作/预览后返回选中的文件行：高亮边框 + 浅蓝底 */
.kb-file-row--active {
  background: #eef4ff;
  border-color: #3474f4;
  box-shadow: 0 0 0 1px rgba(52,116,244,.35), 0 3px 10px rgba(52,116,244,.12);
}
.kb-file-row--active .kb-file-name { color: #1845c0; font-weight: 600; }
.kb-file-row--active .kb-file-ext, .kb-file-row--active .kb-file-date { color: #3b5fae; }
/* 批量选择 checkbox：平时隐藏，进入批量模式(勾了「全部选中」)才显示 */
.kb-file-check { width: 17px; height: 17px; accent-color: #3474f4; cursor: pointer; flex-shrink: 0; visibility: hidden; display: inline-block; }
.kb-batch-active .kb-file-check { visibility: visible; }
.kb-file-row.is-checked { background: #f4f7ff; border-color: #b9cdf8; }
/* 文件列表上方工具条：类型筛选 + 全选 + 批量操作 */
.kb-batch-bar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 10px; padding: 6px 24px 8px; border-bottom: 1px solid #edf0f5; margin: 2px 2px 8px;
}
.kb-batch-left, .kb-batch-right { display: flex; align-items: center; gap: 10px; }
.kb-batch-sort { display: inline-flex; align-items: center; flex-shrink: 0; }
.kb-batch-checkall { width: 17px; height: 17px; accent-color: #3474f4; cursor: pointer; }
.kb-batch-type-btn, .kb-batch-action-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: 8px; border: 1px solid #d6deeb; background: #fff;
  color: #3b4758; font-size: 13px; font-weight: 500; cursor: pointer;
}
.kb-batch-type-btn:hover, .kb-batch-action-btn:hover { border-color: #b6c4da; color: #1845c0; }
.kb-caret { font-size: 10px; color: #8a99ad; }
.kb-batch-count { font-size: 12px; color: #6b7a8c; }
.kb-batch-count:empty { display: none; }
.kb-type-menu a, .kb-batch-menu button { white-space: nowrap; }
.kb-type-menu .kb-menu-item.is-active { color: #1845c0; font-weight: 600; }
.kb-file-main { display: flex; align-items: center; gap: 10px; text-decoration: none; min-width: 0; }
.kb-file-icon {
  width: 38px; height: 38px; border-radius: 9px; flex-shrink: 0;
  background: #dbe8fd center/contain no-repeat;
}
.kb-file-icon--docx, .kb-file-icon--doc { background-color: #dbe8fd; }
.kb-file-icon--pdf { background-color: #fce8c4; }
.kb-file-icon--xlsx, .kb-file-icon--xls { background-color: #e4d5fa; }
.kb-file-icon--link { background-color: #dbe8fd; }
.kb-file-icon--md, .kb-file-icon--txt { background-color: #e5e9ee; }
.kb-file-name { font-size: 15px; color: #33415c; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.kb-file-name:hover { color: #1845c0; }
/* 聚合视图下标注这份资料所在的文件夹（二级目录），避免「文件看不出归属」 */
.kb-file-folder {
  flex-shrink: 0; max-width: 168px;
  font-size: 12px; line-height: 1.5; color: #6b7b90;
  background: #f2f5f9; border: 1px solid #e3e9f1; border-radius: 4px;
  padding: 1px 7px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.kb-file-row--active .kb-file-folder { color: #3b5fae; background: #e7eefc; border-color: #ccdcf8; }
@media (max-width: 900px) { .kb-file-folder { max-width: 96px; } }
.kb-link-open { color: #5a97f8; margin-left: 4px; }
.kb-file-ext { font-size: 13px; color: #5b6b7c; }
.kb-file-date { font-size: 13px; color: #8a99ad; }
.kb-file-actions { text-align: right; position: relative; }
.kb-file-more { border: 0; background: transparent; color: #8a99ad; cursor: pointer; font-size: 14px; padding: 2px 6px; }
.kb-file-more:hover { color: #33415c; }
.kb-file-row .lesson-doc-menu {
  display: none;
  position: absolute;
  right: 0;
  top: 100%;
  z-index: 20;
  background: #fff;
  border: 1px solid #e0e6ef;
  border-radius: 8px;
  box-shadow: 0 6px 20px rgba(0,0,0,.12);
  padding: 6px;
  min-width: 140px;
}
.kb-file-row .lesson-doc-menu.is-open { display: block; }
.kb-file-row .lesson-doc-menu button {
  display: block;
  width: 100%;
  text-align: left;
  border: 0;
  background: transparent;
  padding: 6px 10px;
  font-size: 13px;
  color: #33415c;
  cursor: pointer;
  border-radius: 6px;
}
.kb-file-row .lesson-doc-menu button:hover { background: #f0f4f8; }
.kb-file-row .lesson-doc-menu form { display: none; }
.kb-file-row .lesson-doc-menu button.danger { color: #e04b4b; }

/* 让知识库页面在 app-main 内全宽 */
.app-main:has(.kb-page) {
  max-width: none;
  width: 100%;
  padding: 0;
}

/* ============ 知识库三栏页 移动端适配 ============ */
@media (max-width: 820px) {
  .kb-shell {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  /* 第一栏系统目录：横向紧凑 */
  .kb-sidebar {
    border-right: 0;
    border-bottom: 1px solid #e3e8ef;
    padding: 10px 12px;
    gap: 8px;
  }
  .kb-sys-children {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-left: 0;
    padding-left: 0;
    border-left: 0;
  }
  .kb-l1-row {
    width: auto;
    flex: 0 0 auto;
    padding: 5px 10px;
    border: 1px solid #e0e6ef;
    border-radius: 16px;
    background: #fff;
  }
  .kb-l1-row--active { background: #dbe8fd; border-color: #5a97f8; }
  .kb-trash { margin-top: 0; }

  /* 第二栏：二级文件夹横向滚动卡片 */
  .kb-middle {
    border-right: 0;
    border-bottom: 1px solid #e3e8ef;
    min-height: auto;
  }
  .kb-middle-head { padding: 10px 12px; }
  .kb-crumb { margin-bottom: 8px; flex-wrap: wrap; }
  .kb-sub-grid {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 10px 12px;
    grid-template-columns: none;
    -webkit-overflow-scrolling: touch;
  }
  .kb-sub-card { flex: 0 0 120px; }
  .kb-sub-main { padding: 12px 8px; gap: 6px; }
  .kb-sub-icon { width: 34px; height: 34px; border-radius: 8px; }
  .kb-sub-icon::before { left: 8px; top: 10px; width: 18px; height: 13px; }
  .kb-sub-icon::after { left: 8px; top: 7px; width: 8px; height: 5px; }
  .kb-sub-empty { padding: 16px; }

  /* 第三栏：文件列表 */
  .kb-files { min-height: auto; }
  .kb-files-head { padding: 10px 12px; flex-direction: column; align-items: stretch; gap: 10px; }
  .kb-files-actions { flex-wrap: wrap; }
  .kb-linkbar { flex: 1; flex-direction: column; align-items: stretch; }
  .kb-linkbar input { width: 100%; }
  .kb-file-list { padding: 10px 12px; }

  /* 文件行：改为上下两行的卡片，避免横向溢出 */
  .kb-file-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
  }
  .kb-file-main { flex: 1; min-width: 0; }
  .kb-file-ext { display: none; }
  .kb-file-date { display: none; }
  .kb-file-actions { flex-shrink: 0; position: relative; }
  .kb-file-name { font-size: 13px; }
  .kb-file-icon { width: 24px; height: 24px; border-radius: 6px; }
}

/* 第一栏：系统目录行尾「+ 新建一级文件夹」按钮 */
.kb-sys-add {
  width: 24px;
  height: 24px;
  border: 1px solid #cdd9e8;
  border-radius: 7px;
  background: #eef3fb;
  color: #3474f4;
  cursor: pointer;
  font-size: 17px;
  font-weight: 700;
  line-height: 1;
  flex-shrink: 0;
  transition: background .12s ease, color .12s ease, transform .12s ease;
}
.kb-sys-add:hover { background: #3474f4; color: #fff; transform: scale(1.06); }
.kb-sys-none {
  padding: 2px 8px 6px;
  font-size: 12px;
  color: #b0bccb;
}

/* 第二栏：纵向紧凑列表 */
.kb-sub-list {
  flex: 1;
  overflow-y: auto;
  padding: 10px 10px;
}
.kb-sub-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  margin-bottom: 2px;
  cursor: pointer;
  position: relative;
}
.kb-sub-row:hover { background: #f0f4f8; }
.kb-sub-row--active { background: #dbe8fd; }
.kb-sub-row--active .kb-sub-name { color: #1845c0; font-weight: 600; }
.kb-sub-link {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}
.kb-sub-icon {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: #dbe8fd;
  position: relative;
  flex-shrink: 0;
}
.kb-sub-icon::before {
  content: '';
  position: absolute;
  left: 8px; top: 11px;
  width: 18px; height: 14px;
  border-radius: 2px 2px 3px 3px;
  background: #5a97f8;
}
.kb-sub-icon::after {
  content: '';
  position: absolute;
  left: 8px; top: 6px;
  width: 9px; height: 6px;
  border-radius: 1px 1px 0 0;
  background: #8ebbfb;
}
.kb-sub-name {
  font-size: 14px;
  color: #33415c;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.kb-sub-count {
  font-size: 12px;
  color: #8a99ad;
  flex-shrink: 0;
}
.kb-sub-actions { position: relative; flex-shrink: 0; }
.kb-sub-more {
  border: 0;
  background: transparent;
  color: #8a99ad;
  cursor: pointer;
  font-size: 14px;
  padding: 2px 6px;
  border-radius: 5px;
}
.kb-sub-more:hover { background: #dfe8f5; color: #33415c; }
.kb-sub-actions .lesson-doc-menu {
  display: none;
  position: absolute;
  right: 0;
  top: 100%;
  z-index: 30;
  background: #fff;
  border: 1px solid #e0e6ef;
  border-radius: 8px;
  box-shadow: 0 6px 20px rgba(0,0,0,.12);
  padding: 4px;
  min-width: 120px;
}
.kb-sub-actions .lesson-doc-menu.is-open { display: block; }
.kb-sub-actions .lesson-doc-menu button {
  display: block;
  width: 100%;
  text-align: left;
  border: 0;
  background: transparent;
  padding: 6px 10px;
  font-size: 13px;
  color: #33415c;
  cursor: pointer;
  border-radius: 6px;
}
.kb-sub-actions .lesson-doc-menu button:hover { background: #f0f4f8; }
.kb-sub-actions .lesson-doc-menu form { display: block; }
.kb-sub-actions .lesson-doc-menu button.danger { color: #e04b4b; }

/* 移动端：第二栏纵向列表保持单列 */
@media (max-width: 820px) {
  .kb-sub-list { padding: 6px 8px; }
  .kb-sub-row { padding: 8px 10px; }
}

/* ============ 知识库页面视觉精修 ============ */
.kb-btn--primary {
  background: #5a97f8;
  border-color: #5a97f8;
  color: #fff;
  font-weight: 500;
}
.kb-btn--primary:hover { background: #3474f4; border-color: #3474f4; color: #fff; }

/* 「新建」下拉菜单 */
.kb-dropdown { position: relative; display: inline-flex; }
.kb-dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  z-index: 40;
  min-width: 150px;
  background: #fff;
  border: 1px solid #e0e6ef;
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(20,40,80,.12);
  padding: 5px;
}
.kb-dropdown-menu button,
.kb-dropdown-menu label {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  text-align: left;
  border: 0;
  background: transparent;
  padding: 8px 12px;
  font-size: 13px;
  color: #33415c;
  cursor: pointer;
  border-radius: 7px;
}
.kb-dropdown-menu button:hover,
.kb-dropdown-menu label:hover { background: #f0f4f8; }
.kb-dropdown-menu label input { display: none; }

/* 第一栏一级文件夹日期 */
.kb-l1-date {
  font-size: 11px;
  color: #b0bccb;
  flex-shrink: 0;
  margin-left: auto;
}

/* 第二栏二级文件夹 meta（数量+日期） */
.kb-sub-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: #b0bccb;
  flex-shrink: 0;
}
.kb-sub-date { color: #b0bccb; }

/* 整体精致化：圆角/阴影/过渡 */
.kb-sys-row, .kb-l1-row { transition: background .15s; }
.kb-sub-row { transition: background .15s; }
.kb-file-row { transition: border-color .15s, box-shadow .15s; }
.kb-file-row:hover { border-color: #bcd6fc; box-shadow: 0 2px 10px rgba(52,116,244,.06); }
.kb-btn { transition: background .15s, border-color .15s, color .15s; }

/* ============ 中间栏 头部工具条 + 右键菜单 + 检索 ============ */
.kb-middle-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.kb-middle-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}
.kb-icon-btn {
  width: 36px;
  height: 36px;
  border: 1px solid #e0e6ef;
  border-radius: 9px;
  background: #fff;
  color: #4a5b70;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: border-color .15s, color .15s, background .15s;
}
.kb-icon-btn:hover { border-color: #5a97f8; color: #3474f4; }
.kb-icon-btn--primary {
  background: #5a97f8; border-color: #5a97f8; color: #fff; font-weight: 700;
}
.kb-icon-btn--primary:hover { background: #3474f4; color: #fff; }
.kb-menu-item {
  display: block;
  padding: 8px 12px;
  font-size: 13px;
  color: #33415c;
  text-decoration: none;
  border-radius: 7px;
}
.kb-menu-item:hover { background: #f0f4f8; color: #1845c0; }

/* 中间栏检索框 */
.kb-mid-search { padding: 8px 16px; border-bottom: 1px solid #eef1f5; }
.kb-mid-search form { display: flex; gap: 6px; }
.kb-mid-search input {
  flex: 1;
  height: 34px;
  padding: 0 10px;
  border: 1px solid #dfe5ee;
  border-radius: 8px;
  font-size: 13px;
  outline: none;
  color: #33415c;
}
.kb-mid-search input:focus { border-color: #5a97f8; }
.kb-mid-search button {
  height: 34px;
  padding: 0 14px;
  border: 1px solid #5a97f8;
  border-radius: 8px;
  background: #5a97f8;
  color: #fff;
  font-size: 13px;
  cursor: pointer;
}

/* 右键菜单 */
.kb-ctxmenu {
  position: fixed;
  z-index: 100;
  min-width: 140px;
  background: #fff;
  border: 1px solid #e0e6ef;
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(20,40,80,.14);
  padding: 5px;
}
.kb-ctxmenu button {
  display: block;
  width: 100%;
  text-align: left;
  border: 0;
  background: transparent;
  padding: 8px 12px;
  font-size: 13px;
  color: #33415c;
  cursor: pointer;
  border-radius: 6px;
}
.kb-ctxmenu button:hover { background: #f0f4f8; color: #1845c0; }
.kb-ctxmenu button.danger { color: #e04b4b; }
.kb-ctxmenu button.danger:hover { background: #fdf0f0; }

/* 二级文件夹行：图标 + 名称 + 文件数 */
.kb-sub-count {
  font-size: 12px;
  color: #8a99ad;
  margin-left: auto;
  flex-shrink: 0;
}

/* ==== BEGIN pdfjs-preview-layers (自动生成，请勿手改；重新生成见 tools/pdfjs_layers_css.py) ==== */
/* ------------------------------------------------------------------
 * pdf.js 文字层 / 原生标注层样式
 * 裁剪自 pdfjs-dist@4.10.38 的 web/pdf_viewer.css（Apache-2.0，Mozilla Foundation）。
 * 仅保留 .textLayer（文字可选可复制、可搜索高亮）与 .annotationLayer（原生链接/批注/高亮/弹窗）；
 * 已剔除 pdf.js 自带 PDF 编辑器相关规则。
 * 重新生成：python tools/pdfjs_layers_css.py <官方 pdf_viewer.css>
 * ------------------------------------------------------------------ */

.textLayer{
  position:absolute;
  text-align:initial;
  inset:0;
  overflow:clip;
  opacity:1;
  line-height:1;
  -webkit-text-size-adjust:none;
     -moz-text-size-adjust:none;
          text-size-adjust:none;
  forced-color-adjust:none;
  transform-origin:0 0;
  caret-color:CanvasText;
  z-index:0;
}
.textLayer.highlighting{
    touch-action:none;
  }
.textLayer :is(span,br){
    color:transparent;
    position:absolute;
    white-space:pre;
    cursor:text;
    transform-origin:0% 0%;
  }
.textLayer  > :not(.markedContent),.textLayer .markedContent span:not(.markedContent){
    z-index:1;
  }
.textLayer span.markedContent{
    top:0;
    height:0;
  }
.textLayer span[role="img"]{
    -webkit-user-select:none;
       -moz-user-select:none;
            user-select:none;
    cursor:default;
  }
.textLayer .highlight{
    --highlight-bg-color:rgb(180 0 170 / 0.25);
    --highlight-selected-bg-color:rgb(0 100 0 / 0.25);
    --highlight-backdrop-filter:none;
    --highlight-selected-backdrop-filter:none;
  }
@media screen and (forced-colors: active){

.textLayer .highlight{
      --highlight-bg-color:transparent;
      --highlight-selected-bg-color:transparent;
      --highlight-backdrop-filter:var(--hcm-highlight-filter);
      --highlight-selected-backdrop-filter:var(
        --hcm-highlight-selected-filter
      );
  }
    }
.textLayer .highlight{

    margin:-1px;
    padding:1px;
    background-color:var(--highlight-bg-color);
    -webkit-backdrop-filter:var(--highlight-backdrop-filter);
            backdrop-filter:var(--highlight-backdrop-filter);
    border-radius:4px;
  }
.appended:is(.textLayer .highlight){
      position:initial;
    }
.begin:is(.textLayer .highlight){
      border-radius:4px 0 0 4px;
    }
.end:is(.textLayer .highlight){
      border-radius:0 4px 4px 0;
    }
.middle:is(.textLayer .highlight){
      border-radius:0;
    }
.selected:is(.textLayer .highlight){
      background-color:var(--highlight-selected-bg-color);
      -webkit-backdrop-filter:var(--highlight-selected-backdrop-filter);
              backdrop-filter:var(--highlight-selected-backdrop-filter);
    }
.textLayer ::-moz-selection{
    background:rgba(0 0 255 / 0.25);
    background:color-mix(in srgb, AccentColor, transparent 75%);
  }
.textLayer ::selection{
    background:rgba(0 0 255 / 0.25);
    background:color-mix(in srgb, AccentColor, transparent 75%);
  }
.textLayer br::-moz-selection{
    background:transparent;
  }
.textLayer br::selection{
    background:transparent;
  }
.textLayer .endOfContent{
    display:block;
    position:absolute;
    inset:100% 0 0;
    z-index:0;
    cursor:default;
    -webkit-user-select:none;
       -moz-user-select:none;
            user-select:none;
  }
.textLayer.selecting .endOfContent{
    top:0;
  }
.annotationLayer{
  --annotation-unfocused-field-background:url("data:image/svg+xml;charset=UTF-8,<svg width='1px' height='1px' xmlns='http://www.w3.org/2000/svg'><rect width='100%' height='100%' style='fill:rgba(0, 54, 255, 0.13);'/></svg>");
  --input-focus-border-color:Highlight;
  --input-focus-outline:1px solid Canvas;
  --input-unfocused-border-color:transparent;
  --input-disabled-border-color:transparent;
  --input-hover-border-color:black;
  --link-outline:none;
}
@media screen and (forced-colors: active){

.annotationLayer{
    --input-focus-border-color:CanvasText;
    --input-unfocused-border-color:ActiveText;
    --input-disabled-border-color:GrayText;
    --input-hover-border-color:Highlight;
    --link-outline:1.5px solid LinkText;
}

    .annotationLayer .textWidgetAnnotation :is(input,textarea):required,.annotationLayer .choiceWidgetAnnotation select:required,.annotationLayer .buttonWidgetAnnotation:is(.checkBox,.radioButton) input:required{
      outline:1.5px solid selectedItem;
    }

    .annotationLayer .linkAnnotation{
      outline:var(--link-outline);
    }

      :is(.annotationLayer .linkAnnotation):hover{
        -webkit-backdrop-filter:var(--hcm-highlight-filter);
                backdrop-filter:var(--hcm-highlight-filter);
      }

      :is(.annotationLayer .linkAnnotation) > a:hover{
        opacity:0 !important;
        background:none !important;
        box-shadow:none;
      }

    .annotationLayer .popupAnnotation .popup{
      outline:calc(1.5px * var(--scale-factor)) solid CanvasText !important;
      background-color:ButtonFace !important;
      color:ButtonText !important;
    }

    .annotationLayer .highlightArea:hover::after{
      position:absolute;
      top:0;
      left:0;
      width:100%;
      height:100%;
      -webkit-backdrop-filter:var(--hcm-highlight-filter);
              backdrop-filter:var(--hcm-highlight-filter);
      content:"";
      pointer-events:none;
    }

    .annotationLayer .popupAnnotation.focused .popup{
      outline:calc(3px * var(--scale-factor)) solid Highlight !important;
    }
  }
.annotationLayer{

  position:absolute;
  top:0;
  left:0;
  pointer-events:none;
  transform-origin:0 0;
}
.annotationLayer[data-main-rotation="90"] .norotate{
    transform:rotate(270deg) translateX(-100%);
  }
.annotationLayer[data-main-rotation="180"] .norotate{
    transform:rotate(180deg) translate(-100%, -100%);
  }
.annotationLayer[data-main-rotation="270"] .norotate{
    transform:rotate(90deg) translateY(-100%);
  }
.annotationLayer.disabled section,.annotationLayer.disabled .popup{
      pointer-events:none;
    }
.annotationLayer .annotationContent{
    position:absolute;
    width:100%;
    height:100%;
    pointer-events:none;
  }
.freetext:is(.annotationLayer .annotationContent){
      background:transparent;
      border:none;
      inset:0;
      overflow:visible;
      white-space:nowrap;
      font:10px sans-serif;
      line-height:1.35;
      -webkit-user-select:none;
         -moz-user-select:none;
              user-select:none;
    }
.annotationLayer section{
    position:absolute;
    text-align:initial;
    pointer-events:auto;
    box-sizing:border-box;
    transform-origin:0 0;
  }
:is(.annotationLayer section):has(div.annotationContent) canvas.annotationContent{
        display:none;
      }
.textLayer.selecting ~ .annotationLayer section{
    pointer-events:none;
  }
.annotationLayer :is(.linkAnnotation,.buttonWidgetAnnotation.pushButton) > a{
    position:absolute;
    font-size:1em;
    top:0;
    left:0;
    width:100%;
    height:100%;
  }
.annotationLayer :is(.linkAnnotation,.buttonWidgetAnnotation.pushButton):not(.hasBorder) > a:hover{
    opacity:0.2;
    background-color:rgb(255 255 0);
    box-shadow:0 2px 10px rgb(255 255 0);
  }
.annotationLayer .linkAnnotation.hasBorder:hover{
    background-color:rgb(255 255 0 / 0.2);
  }
.annotationLayer .hasBorder{
    background-size:100% 100%;
  }
.annotationLayer .textAnnotation img{
    position:absolute;
    cursor:pointer;
    width:100%;
    height:100%;
    top:0;
    left:0;
  }
.annotationLayer .textWidgetAnnotation :is(input,textarea),.annotationLayer .choiceWidgetAnnotation select,.annotationLayer .buttonWidgetAnnotation:is(.checkBox,.radioButton) input{
    background-image:var(--annotation-unfocused-field-background);
    border:2px solid var(--input-unfocused-border-color);
    box-sizing:border-box;
    font:calc(9px * var(--scale-factor)) sans-serif;
    height:100%;
    margin:0;
    vertical-align:top;
    width:100%;
  }
.annotationLayer .textWidgetAnnotation :is(input,textarea):required,.annotationLayer .choiceWidgetAnnotation select:required,.annotationLayer .buttonWidgetAnnotation:is(.checkBox,.radioButton) input:required{
    outline:1.5px solid red;
  }
.annotationLayer .choiceWidgetAnnotation select option{
    padding:0;
  }
.annotationLayer .buttonWidgetAnnotation.radioButton input{
    border-radius:50%;
  }
.annotationLayer .textWidgetAnnotation textarea{
    resize:none;
  }
.annotationLayer .textWidgetAnnotation [disabled]:is(input,textarea),.annotationLayer .choiceWidgetAnnotation select[disabled],.annotationLayer .buttonWidgetAnnotation:is(.checkBox,.radioButton) input[disabled]{
    background:none;
    border:2px solid var(--input-disabled-border-color);
    cursor:not-allowed;
  }
.annotationLayer .textWidgetAnnotation :is(input,textarea):hover,.annotationLayer .choiceWidgetAnnotation select:hover,.annotationLayer .buttonWidgetAnnotation:is(.checkBox,.radioButton) input:hover{
    border:2px solid var(--input-hover-border-color);
  }
.annotationLayer .textWidgetAnnotation :is(input,textarea):hover,.annotationLayer .choiceWidgetAnnotation select:hover,.annotationLayer .buttonWidgetAnnotation.checkBox input:hover{
    border-radius:2px;
  }
.annotationLayer .textWidgetAnnotation :is(input,textarea):focus,.annotationLayer .choiceWidgetAnnotation select:focus{
    background:none;
    border:2px solid var(--input-focus-border-color);
    border-radius:2px;
    outline:var(--input-focus-outline);
  }
.annotationLayer .buttonWidgetAnnotation:is(.checkBox,.radioButton) :focus{
    background-image:none;
    background-color:transparent;
  }
.annotationLayer .buttonWidgetAnnotation.checkBox :focus{
    border:2px solid var(--input-focus-border-color);
    border-radius:2px;
    outline:var(--input-focus-outline);
  }
.annotationLayer .buttonWidgetAnnotation.radioButton :focus{
    border:2px solid var(--input-focus-border-color);
    outline:var(--input-focus-outline);
  }
.annotationLayer .buttonWidgetAnnotation.checkBox input:checked::before,.annotationLayer .buttonWidgetAnnotation.checkBox input:checked::after,.annotationLayer .buttonWidgetAnnotation.radioButton input:checked::before{
    background-color:CanvasText;
    content:"";
    display:block;
    position:absolute;
  }
.annotationLayer .buttonWidgetAnnotation.checkBox input:checked::before,.annotationLayer .buttonWidgetAnnotation.checkBox input:checked::after{
    height:80%;
    left:45%;
    width:1px;
  }
.annotationLayer .buttonWidgetAnnotation.checkBox input:checked::before{
    transform:rotate(45deg);
  }
.annotationLayer .buttonWidgetAnnotation.checkBox input:checked::after{
    transform:rotate(-45deg);
  }
.annotationLayer .buttonWidgetAnnotation.radioButton input:checked::before{
    border-radius:50%;
    height:50%;
    left:25%;
    top:25%;
    width:50%;
  }
.annotationLayer .textWidgetAnnotation input.comb{
    font-family:monospace;
    padding-left:2px;
    padding-right:0;
  }
.annotationLayer .textWidgetAnnotation input.comb:focus{
    width:103%;
  }
.annotationLayer .buttonWidgetAnnotation:is(.checkBox,.radioButton) input{
    -webkit-appearance:none;
       -moz-appearance:none;
            appearance:none;
  }
.annotationLayer .fileAttachmentAnnotation .popupTriggerArea{
    height:100%;
    width:100%;
  }
.annotationLayer .popupAnnotation{
    position:absolute;
    font-size:calc(9px * var(--scale-factor));
    pointer-events:none;
    width:-moz-max-content;
    width:max-content;
    max-width:45%;
    height:auto;
  }
.annotationLayer .popup{
    background-color:rgb(255 255 153);
    box-shadow:0 calc(2px * var(--scale-factor)) calc(5px * var(--scale-factor)) rgb(136 136 136);
    border-radius:calc(2px * var(--scale-factor));
    outline:1.5px solid rgb(255 255 74);
    padding:calc(6px * var(--scale-factor));
    cursor:pointer;
    font:message-box;
    white-space:normal;
    word-wrap:break-word;
    pointer-events:auto;
  }
.annotationLayer .popupAnnotation.focused .popup{
    outline-width:3px;
  }
.annotationLayer .popup *{
    font-size:calc(9px * var(--scale-factor));
  }
.annotationLayer .popup > .header{
    display:inline-block;
  }
.annotationLayer .popup > .header h1{
    display:inline;
  }
.annotationLayer .popup > .header .popupDate{
    display:inline-block;
    margin-left:calc(5px * var(--scale-factor));
    width:-moz-fit-content;
    width:fit-content;
  }
.annotationLayer .popupContent{
    border-top:1px solid rgb(51 51 51);
    margin-top:calc(2px * var(--scale-factor));
    padding-top:calc(2px * var(--scale-factor));
  }
.annotationLayer .richText > *{
    white-space:pre-wrap;
    font-size:calc(9px * var(--scale-factor));
  }
.annotationLayer .popupTriggerArea{
    cursor:pointer;
  }
.annotationLayer section svg{
    position:absolute;
    width:100%;
    height:100%;
    top:0;
    left:0;
  }
.annotationLayer .annotationTextContent{
    position:absolute;
    width:100%;
    height:100%;
    opacity:0;
    color:transparent;
    -webkit-user-select:none;
       -moz-user-select:none;
            user-select:none;
    pointer-events:none;
  }
:is(.annotationLayer .annotationTextContent) span{
      width:100%;
      display:inline-block;
    }
.annotationLayer svg.quadrilateralsContainer{
    contain:strict;
    width:0;
    height:0;
    position:absolute;
    top:0;
    left:0;
    z-index:-1;
  }
.textLayer.highlighting{
    cursor:var(--editorFreeHighlight-editing-cursor);
  }
.textLayer.highlighting:not(.free) span{
      cursor:var(--editorHighlight-editing-cursor);
    }
[role="img"]:is(.textLayer.highlighting:not(.free) span){
        cursor:var(--editorFreeHighlight-editing-cursor);
      }
.textLayer.highlighting.free span{
      cursor:var(--editorFreeHighlight-editing-cursor);
    }
@media (prefers-color-scheme: dark){

:is(.annotationEditorLayer :is(.freeTextEditor,.inkEditor,.stampEditor,.highlightEditor),.textLayer) .editToolbar{
      --editor-toolbar-bg-color:#2b2a33;
      --editor-toolbar-fg-color:#fbfbfe;
      --editor-toolbar-hover-bg-color:#52525e;
      --editor-toolbar-focus-outline-color:#0df;
      --alt-text-done-color:#54ffbd;
      --alt-text-warning-color:#80ebff;
  }
    }
@media screen and (forced-colors: active){

:is(.annotationEditorLayer :is(.freeTextEditor,.inkEditor,.stampEditor,.highlightEditor),.textLayer) .editToolbar{
      --editor-toolbar-bg-color:ButtonFace;
      --editor-toolbar-fg-color:ButtonText;
      --editor-toolbar-border-color:ButtonText;
      --editor-toolbar-hover-border-color:AccentColor;
      --editor-toolbar-hover-bg-color:ButtonFace;
      --editor-toolbar-hover-fg-color:AccentColor;
      --editor-toolbar-hover-outline:2px solid var(--editor-toolbar-hover-border-color);
      --editor-toolbar-focus-outline-color:ButtonBorder;
      --editor-toolbar-shadow:none;
      --alt-text-done-color:var(--editor-toolbar-fg-color);
      --alt-text-warning-color:var(--editor-toolbar-fg-color);
      --alt-text-hover-done-color:var(--editor-toolbar-hover-fg-color);
      --alt-text-hover-warning-color:var(--editor-toolbar-hover-fg-color);
  }
    }
@media (prefers-color-scheme: dark){

.show:is(:is(:is(:is(:is(.annotationEditorLayer :is(.freeTextEditor,.inkEditor,.stampEditor,.highlightEditor),.textLayer) .editToolbar) .buttons) .altText) .tooltip){
              --alt-text-tooltip-bg:#1c1b22;
              --alt-text-tooltip-fg:#fbfbfe;
              --alt-text-tooltip-shadow:0px 2px 6px 0px #15141a;
          }
            }
@media screen and (forced-colors: active){

.show:is(:is(:is(:is(:is(.annotationEditorLayer :is(.freeTextEditor,.inkEditor,.stampEditor,.highlightEditor),.textLayer) .editToolbar) .buttons) .altText) .tooltip){
              --alt-text-tooltip-bg:Canvas;
              --alt-text-tooltip-fg:CanvasText;
              --alt-text-tooltip-border:CanvasText;
              --alt-text-tooltip-shadow:none;
          }
            }

/* ------------------------------------------------------------------
 * 连续滚动 PDF 查看器（原版式 + 文字层 + 原生标注层 + 临时画笔）
 * 结构见 static/js/pdf-viewer.js
 * ------------------------------------------------------------------ */
/* PDF 预览：去掉外层白卡片的内边距/边框/圆角，让文档直接铺在整页背景上，
   并把整体宽度放开——屏幕多宽就给文档多宽，放大时文档跟着变宽。 */
.lesson-preview-page:has(.lesson-pdf-app) { max-width: none; padding: 0; }
.lesson-preview-page:has(.lesson-pdf-app) .lesson-preview-page-body {
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  min-height: 0;
}
/* 页头不再固定：滚动后只剩顶头的工具栏（放大缩小/标注一直在手边），
   否则两个 sticky 层会叠在一起把工具栏盖掉。 */
.lesson-preview-page:has(.lesson-pdf-app) .lesson-preview-page-head {
  position: static;
  padding: 14px 28px;
}
/* 页内浮层（embed）预览 PDF 时同样铺满 */
body.lesson-preview-embed:has(.lesson-pdf-app) { padding: 0; }
body.lesson-preview-embed .lesson-preview-page-body:has(.lesson-pdf-app) { padding: 0; border: 0; background: transparent; }
/* 两侧留白交给 .lesson-pdf-scroll，文档本身不再被任何框限制 */

.lesson-pdf-app {
  display: flex;
  flex-direction: column;
  /* 不用边框/圆角把文档框死：整页背景 + 页面直接铺上去，像阅读器一样一页页向上滚 */
  background: transparent;
}
.lesson-pdf-app-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  /* 顶头固定：滚动时缩放与标注工具始终在顶部，不跟着文档跑 */
  position: sticky;
  top: 0;
  z-index: 30;
  padding: 8px 10px;
  border-bottom: 1px solid #edf1f5;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: blur(6px);
}
.lesson-pdf-app-bar button {
  height: 26px;
  padding: 0 9px;
  font-size: 12px;
  line-height: 1;
  color: #475569;
  background: #fff;
  border: 1px solid #dde4ec;
  border-radius: 6px;
  cursor: pointer;
}
.lesson-pdf-app-bar button:hover { background: #f4f6f9; color: #1e293b; }
/* 画笔开启态：沿用克制的浅底描边，不做高饱和强调 */
.lesson-pdf-app-bar button.is-on { background: #eef2f7; border-color: #c7d1dc; color: #0f172a; }
.lesson-pdf-app-bar button:disabled { opacity: .55; cursor: default; }
.lesson-pdf-zoom { min-width: 46px; text-align: center; font-size: 12px; color: #64748b; }
.lesson-pdf-hint { font-size: 11px; color: #94a3b8; }
.lesson-pdf-spacer { margin-left: auto; }
/* 下载原文件：直接指向服务器上的原始 PDF，不经过 canvas，清晰度与原文件完全一致 */
.lesson-pdf-download {
  height: 26px;
  display: inline-flex;
  align-items: center;
  padding: 0 10px;
  font-size: 12px;
  color: #475569;
  background: #fff;
  border: 1px solid #dde4ec;
  border-radius: 6px;
  text-decoration: none;
}
.lesson-pdf-download:hover { background: #f4f6f9; color: #1e293b; }
/* 「文字」快速入口：与「下载」同款的低调描边按钮，不做强调 */
.lesson-pdf-textlink {
  height: 26px;
  display: inline-flex;
  align-items: center;
  padding: 0 10px;
  font-size: 12px;
  color: #475569;
  background: #fff;
  border: 1px solid #dde4ec;
  border-radius: 6px;
  text-decoration: none;
}
.lesson-pdf-textlink:hover { background: #f4f6f9; color: #1e293b; }
/* ---------- Office 转换中：占位提示 ----------
   转换慢是正常现象（LibreOffice 要加载字体/图片/主题），所以这里不假装进度，
   只说明「正在转换 + 会自动出现」，并把文字预览给出来，避免用户干等空白页。 */
.lesson-convert-wait {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 14px;
  padding: 12px 14px;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  color: #475569;
  font-size: 13px;
  line-height: 1.6;
}
.lesson-convert-wait strong { color: #1e293b; font-size: 13px; }
.lesson-convert-spinner {
  flex: none;
  width: 14px;
  height: 14px;
  border: 2px solid #cbd5e1;
  border-top-color: #64748b;
  border-radius: 50%;
  animation: lesson-convert-spin .9s linear infinite;
}
@keyframes lesson-convert-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
  .lesson-convert-spinner { animation-duration: 3s; }
}
.lesson-convert-note { flex: 1 1 260px; }
.lesson-convert-wait.is-timeout .lesson-convert-spinner { animation: none; border-top-color: #cbd5e1; }
.lesson-convert-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.lesson-convert-actions--inline { margin: 0 0 14px; }
.lesson-convert-actions a {
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 0 12px;
  font-size: 12px;
  color: #475569;
  background: #fff;
  border: 1px solid #dde4ec;
  border-radius: 6px;
  text-decoration: none;
}
.lesson-convert-actions a:hover { background: #f4f6f9; color: #1e293b; }
.lesson-pdf-scroll {
  /* 不再是内部滚动框：交给窗口滚动，文档从下往上整页滚 */
  display: block;
  padding: 18px 16px 56px;
  background: #f0f2f5;
}
/* ---------- 左侧页面目录（缩略图） ----------
   .lesson-pdf-body 是 flex：目录固定占一栏，文档区 flex:1。
   ⚠️ 文档区必须 min-width:0 —— 否则 flex item 的默认 min-width:auto 会被
   页面 canvas 的固定像素宽度撑开，可用宽度越算越大，缩放会自己滚雪球。
   有了 min-width:0，文档区宽度恒等于「总宽 - 目录宽」，放大到上限也压不到目录。 */
.lesson-pdf-body {
  display: flex;
  align-items: flex-start;
  width: 100%;
  /* 左侧目录列的底色与分隔线画在整行上，一路延伸到底，
     而不是跟着目录内容高度断在半空（目录是 sticky，自身高度只有一屏内容那么高）。 */
  background: linear-gradient(to right, #f7f9fb 0 171px, #e6ebf1 171px 172px, transparent 172px);
}
/* 目录收起时左侧不留空带 */
.lesson-pdf-body:has(.lesson-pdf-toc[hidden]) { background: none; }
.lesson-pdf-toc {
  flex: 0 0 172px;
  width: 172px;
  align-self: flex-start;
  /* 顶头固定：文档滚动时侧栏始终在左侧可见 */
  position: sticky;
  top: var(--pdfv-bar-h, 44px);
  max-height: calc(100vh - var(--pdfv-bar-h, 44px) - 24px);
  /* 纵向三段：页码头 / 可滚动视图区 / 底部图标切换。
     滚动交给中间那段，两侧的头与 Tab 永远钉住不动。
     ⚠️ 这里写 display:flex 会盖掉浏览器默认的 [hidden] 规则，所以下面那条
     .lesson-pdf-toc[hidden] 是必需的，删了收起侧栏就失效。
     注释里不要出现花括号，按首尾花括号切规则的测试会被截断。 */
  display: flex;
  flex-direction: column;
  overflow: hidden;
  overscroll-behavior: contain;
}
.lesson-pdf-toc[hidden] { display: none; }
/* 页码头：图标在左、页码在右，与阅读器的观感一致 */
.lesson-pdf-side-head {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  padding: 8px 10px 8px 6px;
  border-bottom: 1px solid #e6ebf1;
}
.lesson-pdf-side-page {
  font-size: 11px;
  color: #94a3b8;
  font-variant-numeric: tabular-nums;
}
.lesson-pdf-side-collapse {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  padding: 0;
  color: #94a3b8;
  background: transparent;
  border: 0;
  border-radius: 5px;
  cursor: pointer;
}
.lesson-pdf-side-collapse:hover { background: #eef2f7; color: #475569; }
.lesson-pdf-side-collapse svg {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
}
/* 中段：整个侧栏唯一的滚动容器，同一时刻只显示一个视图 */
.lesson-pdf-side-body {
  flex: 1 1 auto;
  /* 少了 min-height:0，flex item 的高度下限会顶穿 max-height，滚动条永远出不来 */
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 10px 8px;
}
.lesson-pdf-side-view[hidden] { display: none; }
.lesson-pdf-toc-list { display: flex; flex-direction: column; gap: 8px; }
/* 下段：两个图标 Tab，切「页面缩略图 / 我的高亮」 */
.lesson-pdf-side-tabs {
  flex: none;
  display: flex;
  justify-content: center;
  gap: 10px;
  padding: 4px 0;
  border-top: 1px solid #e6ebf1;
}
.lesson-pdf-side-tab {
  flex: 1 1 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  height: 30px;
  padding: 0 4px;
  font-size: 11px;
  color: #94a3b8;
  background: transparent;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
}
.lesson-pdf-side-tab:hover { background: #eef2f7; color: #475569; }
.lesson-pdf-side-tab.is-on { color: #334155; background: #eef2f7; }
.lesson-pdf-side-tab svg {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}
/* 缩略图条目：默认低调，当前页才轻微强调 */
.pdfv-thumb {
  display: block;
  width: 100%;
  padding: 5px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  cursor: pointer;
  line-height: 0;
  text-align: center;
}
.pdfv-thumb:hover { background: #eef2f7; }
.pdfv-thumb.is-current {
  border-color: #c7d1dc;
  background: #fff;
}
.pdfv-thumb canvas {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(15, 23, 42, .16);
}
.pdfv-thumb-no {
  display: block;
  margin-top: 4px;
  font-size: 11px;
  color: #9aa7b6;
  line-height: 1.2;
}
.pdfv-thumb.is-current .pdfv-thumb-no { color: #475569; }
.pdfv-thumb.is-blank canvas {
  /* 未渲染时先按首页宽高比占位（--pdfv-thumb-h 由 JS 写入），避免目录跳动。
     竖版 A4 与横版 PPT 的比例差很多，写死高度会让目录在画出来那一刻跳一下。 */
  width: 100%;
  height: var(--pdfv-thumb-h, 180px);
}
/* 窄屏（<=860px）默认收起目录 —— 由 JS 按需给 [hidden]，
   不走媒体查询，这样工具条上的「目录」按钮在窄屏也点得开。 */
.pdfv-page {
  position: relative;
  margin: 0 auto 16px;
  background: #fff;
  box-shadow: 0 1px 4px rgba(15, 23, 42, .13);
}
/* 文档区：必须能收缩（min-width:0），宽度由「总宽 - 目录宽」决定 */
.lesson-pdf-body > .lesson-pdf-scroll {
  flex: 1 1 auto;
  min-width: 0;
}
.pdfv-page-inner { position: relative; }
.pdfv-canvas { display: block; }
/* 文字层与标注层与 canvas 同坐标空间叠加（官方 pdf_layers 样式已含定位，这里兜底） */
.pdfv-page .textLayer { position: absolute; inset: 0; }
.pdfv-page .annotationLayer { position: absolute; inset: 0; }
/* 画笔层默认不接管指针，避免挡住文字选择；仅画笔开启时接管 */
.pdfv-draw { position: absolute; inset: 0; pointer-events: none; touch-action: none; }
.pdfv-page.is-drawing .pdfv-draw { pointer-events: auto; cursor: crosshair; }
.pdfv-page.is-drawing .textLayer { pointer-events: none; }
.pdfv-page-no {
  position: absolute;
  right: 8px;
  bottom: 6px;
  font-size: 11px;
  color: #9aa7b6;
  background: rgba(255, 255, 255, .88);
  padding: 1px 6px;
  border-radius: 4px;
}
.pdfv-loading { text-align: center; color: #94a3b8; font-size: 13px; }

/* ---------- 永久高亮（存服务器，按登录用户隔离，不写回原 PDF） ----------
   图层顺序（DOM）：canvas → .pdfv-hl-layer → .textLayer → .annotationLayer → .pdfv-draw
   色块压在文字层下面，再把黄色做 multiply 混合，黄底黑字照旧清晰，不会糊住原文。
   色块一律用百分比定位（左/上/宽/高都是 %），所以缩放、换窗口、换设备都不用重算。 */
.pdfv-hl-layer {
  position: absolute;
  inset: 0;
  /* 平时不吃指针：文字照常可以选中、复制、搜索 */
  pointer-events: none;
}
.pdfv-hlmark {
  position: absolute;
  border-radius: 2px;
  background: rgba(250, 204, 21, .42);
  mix-blend-mode: multiply;
}
/* 「管理模式」（高亮面板打开）下色块才可点：点一下即删。
   ⚠️ 类挂在 .lesson-pdf-app（root）上，不是挂在 .pdfv-page 上 ——
   写成 .pdfv-page.is-managing-hl 会永远不匹配，色块看着能点实际点不动。 */
.lesson-pdf-app.is-managing-hl .pdfv-hlmark {
  pointer-events: auto;
  cursor: pointer;
  box-shadow: inset 0 0 0 1px rgba(180, 130, 0, .55);
}
.lesson-pdf-app.is-managing-hl .pdfv-hlmark:hover { background: rgba(248, 113, 113, .5); }

/* 选中文字后浮出的「高亮」气泡：用 fixed + 视口坐标定位（getBoundingClientRect） */
.pdfv-hlbubble {
  position: fixed;
  z-index: 60;
  transform: translate(-50%, -100%) translateY(-8px);
  background: #fff;
  border: 1px solid #dde4ec;
  border-radius: 6px;
  box-shadow: 0 4px 14px rgba(15, 23, 42, .16);
  padding: 2px;
}
.pdfv-hlbubble[hidden] { display: none; }
/* 选区贴着视口顶部时翻到下方显示（默认在上方） */
.pdfv-hlbubble.is-below { transform: translate(-50%, 0) translateY(8px); }
.pdfv-hlbubble button {
  height: 26px;
  padding: 0 12px;
  font-size: 12px;
  line-height: 1;
  color: #475569;
  background: #fff;
  border: 0;
  border-radius: 5px;
  cursor: pointer;
}
.pdfv-hlbubble button:hover { background: #f4f6f9; color: #1e293b; }

/* 侧栏「高亮」Tab 上的计数徽标：只在有高亮时出现 */
.lesson-pdf-hlcount {
  display: inline-block;
  min-width: 15px;
  padding: 0 4px;
  font-size: 10px;
  line-height: 15px;
  text-align: center;
  color: #fff;
  background: #94a3b8;
  border-radius: 8px;
}
.lesson-pdf-hlcount[hidden] { display: none; }
.lesson-pdf-side-tab.is-on .lesson-pdf-hlcount { background: #64748b; }

/* 高亮视图：不再是工具条下方的横条，而是侧栏中段的一个视图 ——
   列表与页码头、底部 Tab 之间共享同一列宽，滚动由 .lesson-pdf-side-body 负责。 */
.lesson-pdf-hlpanel {
  position: static;
  max-height: none;
  overflow: visible;
  padding: 0;
  border: 0;
  background: transparent;
}
.lesson-pdf-hlpanel[hidden] { display: none; }
.lesson-pdf-hlpanel-list { display: flex; flex-direction: column; gap: 4px; }
.lesson-pdf-hlpanel-empty { font-size: 12px; color: #94a3b8; line-height: 1.7; padding: 4px 2px; }
/* 按页分组：页码做成一条可点的分组头，同一页的高亮收在它下面 */
.lesson-pdf-hlgroup { margin-bottom: 12px; }
.lesson-pdf-hlgroup:last-child { margin-bottom: 0; }
.lesson-pdf-hlgroup-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  width: 100%;
  padding: 1px 4px 6px;
  font-size: 11px;
  color: #94a3b8;
  background: transparent;
  border: 0;
  border-radius: 4px;
  cursor: pointer;
}
.lesson-pdf-hlgroup-head:hover { background: #eef2f7; color: #475569; }
.lesson-pdf-hlgroup-count { font-size: 10px; color: #a8b3c0; }
/* 高亮条目：底色沿用页面上色块的淡黄，一眼能对上「这条对应那块」 */
.lesson-pdf-hlrow {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 3px;
  border-radius: 5px;
  background: rgba(250, 204, 21, .22);
}
.lesson-pdf-hlrow:hover { background: rgba(250, 204, 21, .34); }
.lesson-pdf-hlrow-main {
  flex: 1 1 auto;
  min-width: 0;
  display: block;
  padding: 5px 6px;
  font-size: 12px;
  text-align: left;
  color: #475569;
  background: transparent;
  border: 0;
  border-radius: 4px;
  cursor: pointer;
}
/* 页码属于分组头（灰调），不跟着高亮条目走，免得在灰标题里跳出一块黄褐 */
.lesson-pdf-hlrow-no { flex: none; font-size: 11px; color: inherit; }
.lesson-pdf-hlrow-text {
  /* 三行封顶：侧栏只有 172px 宽，长句不能把列表撑成一面墙；
     但只留一行又看不出高亮的是哪句，取三行刚好认出内容 */
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
  word-break: break-word;
}
.lesson-pdf-hlrow-del {
  flex: none;
  height: 22px;
  margin-right: 2px;
  padding: 0 6px;
  font-size: 11px;
  line-height: 1;
  color: #94a3b8;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 5px;
  cursor: pointer;
}
/* 悬停整行才现身：列表默认只有一条条淡黄文字，不会被按钮切碎。
   ⚠️ 只在真有指针悬停的设备上这么干 —— 触屏没有 hover，
   藏起来就等于删不掉，所以触屏一律常显。 */
@media (hover: hover) {
  .lesson-pdf-hlrow-del { opacity: 0; pointer-events: none; }
  .lesson-pdf-hlrow:hover .lesson-pdf-hlrow-del,
  .lesson-pdf-hlrow-del:focus-visible { opacity: 1; pointer-events: auto; }
}
.lesson-pdf-hlrow-del:hover { color: #b91c1c; border-color: #f0d2d2; background: #fdf5f5; }
.lesson-pdf-hlpanel-foot {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed #e6ebf1;
  font-size: 11px;
  line-height: 1.7;
  color: #94a3b8;
}
.lesson-pdf-hlpanel-foot button {
  display: block;
  margin-top: 6px;
  height: 22px;
  padding: 0 9px;
  font-size: 11px;
  line-height: 1;
  color: #94a3b8;
  background: #fff;
  border: 1px solid #dde4ec;
  border-radius: 5px;
  cursor: pointer;
}
.lesson-pdf-hlpanel-foot button:hover { color: #b91c1c; border-color: #f0d2d2; background: #fdf5f5; }
/* 操作反馈（保存成功/失败）：列表底部一条临时提示，不弹窗打断 */
.lesson-pdf-hlpanel-tip {
  position: sticky;
  bottom: 0;
  margin-top: 8px;
  padding: 5px 8px;
  font-size: 11px;
  line-height: 1.5;
  color: #475569;
  background: #eef2f7;
  border-radius: 5px;
  opacity: 0;
  transition: opacity .18s ease;
}
.lesson-pdf-hlpanel-tip.is-on { opacity: 1; }

/* 打印/导出：只用原始 PDF（工具栏按钮直接指向原文件），页面上的叠加层不参与 */
@media print {
  .lesson-pdf-app-bar { display: none !important; }
  .lesson-pdf-toc { display: none !important; }
  .lesson-pdf-body { background: none !important; }
  .lesson-pdf-scroll { height: auto; overflow: visible; padding: 0; background: #fff; }
  .pdfv-draw, .pdfv-page-no { display: none !important; }
  .lesson-pdf-hlpanel, .pdfv-hlbubble { display: none !important; }
  .pdfv-page { box-shadow: none; margin: 0; page-break-after: always; }
}
/* ==== END pdfjs-preview-layers ==== */