/* ============================================================
   备课本 Lesson Notebook — 全站样式
   设计方向：教师的备课笔记本
   - 黑板绿（导航 / 强调结构）
   - 牛皮纸卡片（内容承载）
   - 红笔批注色（操作 / 强调）
   字体：标题用衬线（教材质感），正文用无衬线（屏幕可读性）
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:opsz,wght@8..60,400;8..60,600;8..60,700&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@500&display=swap');

:root {
  /* 色板 */
  --ink-green-900: #16281f;
  --ink-green-800: #1f3a2e;
  --ink-green-700: #2a4d3c;
  --chalk: #f2ede0;
  --paper: #fbf8f1;
  --paper-card: #fffdf8;
  --kraft: #e9e0cb;
  --kraft-line: #d8cba9;
  --pencil-red: #ac3b2a;
  --pencil-red-dark: #8c2f21;
  --ink: #2b2620;
  --ink-soft: #635a4c;
  --ink-faint: #8d8371;
  --border: #ddd2b4;

  --font-serif: 'Source Serif 4', 'Songti SC', serif;
  --font-sans: 'IBM Plex Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --radius-s: 3px;
  --radius-m: 5px;
  --shadow-card: 0 1px 0 rgba(43, 38, 32, 0.06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--ink-green-900);
  margin: 0 0 0.4em 0;
}

a { color: var(--ink-green-700); }

button, input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* ---------- 顶部结构 ---------- */

.app-shell {
  display: flex;
  min-height: 100vh;
}

.app-rail {
  width: 220px;
  flex-shrink: 0;
  background: var(--ink-green-900);
  color: var(--chalk);
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.app-rail .brand {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  color: #fff;
  border-bottom: 1px solid rgba(255,255,255,0.14);
  padding-bottom: 16px;
}

.app-rail .brand small {
  display: block;
  margin-top: 6px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 400;
  color: rgba(242,237,224,0.55);
}

.app-rail nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.app-rail nav a {
  color: rgba(242,237,224,0.85);
  text-decoration: none;
  padding: 8px 10px;
  border-radius: var(--radius-s);
  font-size: 14px;
}

.app-rail nav a:hover,
.app-rail nav a.active {
  background: rgba(255,255,255,0.08);
  color: #fff;
}

.app-rail .rail-foot {
  margin-top: auto;
  font-size: 12px;
  font-style: italic;
  line-height: 1.7;
  color: rgba(242,237,224,0.55);
  border-top: 1px solid rgba(255,255,255,0.12);
  padding-top: 14px;
}
.app-rail .rail-foot .rail-foot-text {
  font-family: var(--font-serif);
  font-size: 12.5px;
  color: rgba(242,237,224,0.7);
}

/* ---------- 左栏：已打开教案的标签页 ---------- */

.app-rail .rail-tabs {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-height: 32vh;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.25) transparent;
}

.app-rail .rail-tabs-head {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(242,237,224,0.4);
  padding: 0 10px 6px;
}

.app-rail .rail-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  color: rgba(242,237,224,0.85);
  font-size: 13px;
  line-height: 1.4;
  padding: 7px 6px 7px 10px;
  border-radius: var(--radius-s);
  border-left: 3px solid transparent;
  cursor: pointer;
  transition: background .12s ease;
}

.app-rail .rail-tab:hover {
  background: rgba(255,255,255,0.08);
  color: #fff;
}

.app-rail .rail-tab.active {
  background: rgba(255,255,255,0.1);
  color: #fff;
  border-left-color: var(--pencil-red);
}

.rail-tab-title {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.rail-tab-close {
  flex-shrink: 0;
  border: none;
  background: transparent;
  color: rgba(242,237,224,0.45);
  cursor: pointer;
  font-size: 11px;
  line-height: 1;
  padding: 3px 5px;
  border-radius: 3px;
}

.rail-tab-close:hover {
  color: #fff;
  background: rgba(255,255,255,0.18);
}

.app-main {
  flex: 1;
  min-width: 0;
  padding: 36px 44px 80px;
}

.page-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.page-head h1 { font-size: 26px; }
.page-head p { margin: 4px 0 0; color: var(--ink-soft); font-size: 14px; }

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border);
  background: var(--paper-card);
  color: var(--ink);
  padding: 8px 14px;
  border-radius: var(--radius-s);
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 500;
  line-height: 1;
  transition: border-color .12s ease, background .12s ease;
}
.btn:hover { border-color: var(--ink-green-700); }

.btn-primary {
  background: var(--ink-green-800);
  border-color: var(--ink-green-800);
  color: #fff;
}
.btn-primary:hover { background: var(--ink-green-700); }

.btn-accent {
  background: var(--pencil-red);
  border-color: var(--pencil-red);
  color: #fff;
}
.btn-accent:hover { background: var(--pencil-red-dark); }

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--ink-soft);
}
.btn-ghost:hover { color: var(--ink); background: var(--kraft); }

.btn-danger { color: var(--pencil-red-dark); }

.btn-sm { padding: 5px 10px; font-size: 12.5px; }

.btn:disabled { opacity: 0.45; cursor: not-allowed; }

.toolbar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* ---------- 卡片 / 索引卡（Dashboard） ---------- */

.search-row {
  display: flex;
  gap: 10px;
  margin-bottom: 22px;
}

.search-row input[type="search"] {
  flex: 1;
  max-width: 340px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-s);
  background: var(--paper-card);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.plan-card {
  position: relative;
  background: var(--paper-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--pencil-red);
  border-radius: var(--radius-m);
  padding: 16px 18px 14px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 8px;
  cursor: pointer;
  transition: border-color .12s ease, box-shadow .12s ease, transform .12s ease;
}

.plan-card:hover {
  border-color: var(--ink-green-700);
  border-left-color: var(--pencil-red);
  box-shadow: 0 4px 14px rgba(43, 38, 32, 0.1);
  transform: translateY(-2px);
}

.plan-card .plan-course {
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-faint);
}

.plan-card h3 {
  font-size: 17px;
  margin: 0;
}

.plan-card .plan-meta {
  font-size: 12.5px;
  color: var(--ink-soft);
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.plan-card .plan-actions {
  margin-top: 10px;
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  border-top: 1px dashed var(--border);
  padding-top: 10px;
}

.empty-state {
  border: 1px dashed var(--border);
  border-radius: var(--radius-m);
  padding: 60px 24px;
  text-align: center;
  color: var(--ink-soft);
}

.empty-state h2 { color: var(--ink-green-800); font-size: 19px; margin-bottom: 8px; }

/* ---------- 表单（编辑器） ---------- */

.form-section {
  background: var(--paper-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  padding: 22px 24px;
  margin-bottom: 18px;
}

.form-section h2 {
  font-size: 15px;
  text-transform: none;
  color: var(--ink-green-800);
  border-bottom: 1px solid var(--kraft-line);
  padding-bottom: 10px;
  margin-bottom: 16px;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px 18px;
}

.field { display: flex; flex-direction: column; gap: 5px; }
.field.full { grid-column: 1 / -1; }

.field label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink-soft);
}

.field .hint {
  font-size: 11.5px;
  color: var(--ink-faint);
  font-weight: 400;
}

input[type="text"], input[type="date"], input[type="number"], input[type="url"], textarea {
  border: 1px solid var(--border);
  border-radius: var(--radius-s);
  padding: 9px 10px;
  background: var(--paper);
  width: 100%;
  resize: vertical;
}

textarea { min-height: 88px; line-height: 1.6; }

input:focus, textarea:focus, select:focus {
  outline: 2px solid var(--ink-green-700);
  outline-offset: 1px;
}

/* 参考资料 / 内容大纲 的动态行 */

.repeat-row {
  display: grid;
  grid-template-columns: 110px 1fr auto;
  gap: 8px;
  margin-bottom: 8px;
  align-items: center;
}

/* ---------- 教学内容及过程：Word 式富文本编辑 ---------- */

.rich-toolbar {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.rich-toolbar .rt-btn {
  border: 1px solid var(--border);
  background: var(--paper-card);
  border-radius: var(--radius-s);
  padding: 5px 10px;
  font-size: 12.5px;
  line-height: 1;
  color: var(--ink-soft);
  cursor: pointer;
}
.rich-toolbar .rt-btn:hover {
  border-color: var(--ink-green-700);
  color: var(--ink-green-800);
  background: var(--paper);
}
.rich-toolbar .rt-italic,
.rich-toolbar .rt-underline { font-family: var(--font-serif); }
.rich-toolbar .rt-divider {
  width: 1px;
  height: 18px;
  background: var(--border);
  margin: 0 4px;
}

.rich-editor {
  border: 1px solid var(--border);
  border-radius: var(--radius-s);
  background: var(--paper);
  min-height: 260px;
  max-height: 60vh;
  overflow-y: auto;
  padding: 12px 16px;
  font-size: 14.5px;
  line-height: 1.8;
  outline-offset: 1px;
}
.rich-editor:focus { outline: 2px solid var(--ink-green-700); }
.rich-editor:empty::before {
  content: attr(data-placeholder);
  color: var(--ink-faint);
  pointer-events: none;
}

/* 编辑器内列表样式与导出效果保持一致（所见即所得） */
.rich-editor ul {
  margin: 0;
  padding-left: 1.6em;
  list-style-type: disc;
}
.rich-editor ul ul { list-style-type: circle; }
.rich-editor ul ul ul { list-style-type: square; }
.rich-editor > ul > li { font-weight: 700; }
.rich-editor li { margin: 3px 0; }
.rich-editor p { margin: 0 0 6px; }

.icon-btn {
  border: 1px solid var(--border);
  background: var(--paper-card);
  border-radius: 3px;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 12px;
  line-height: 1;
  color: var(--ink-soft);
}
.icon-btn:hover { border-color: var(--ink-green-700); color: var(--ink-green-800); }

.add-row-btn {
  margin-top: 4px;
}

/* 底部保存条 */

.save-bar {
  position: sticky;
  bottom: 0;
  background: var(--paper);
  padding: 14px 0 4px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border);
  margin-top: 4px;
}

.save-status {
  font-size: 12.5px;
  color: var(--ink-faint);
}

/* ---------- AI 占位区（暂不启用） ---------- */

.ai-placeholder {
  border: 1px dashed var(--kraft-line);
  background: var(--kraft);
  border-radius: var(--radius-m);
  padding: 14px 16px;
  font-size: 13px;
  color: var(--ink-soft);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

/* ---------- Toast ---------- */

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  background: var(--ink-green-900);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--radius-s);
  font-size: 13px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.25);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity .18s ease, transform .18s ease;
  pointer-events: none;
  z-index: 50;
}
.toast.show { opacity: 1; transform: translateY(0); }

/* ---------- 打印视图（导出 PDF 用） ---------- */

#print-root { display: none; }

@media print {
  .app-rail, .app-main > *:not(#print-root) { display: none !important; }
  #print-root { display: block !important; }

  @page {
    size: A4;
    margin: 20mm 18mm;
  }

  body {
    background: #fff;
    font-family: "Songti SC", "SimSun", "Times New Roman", serif;
    font-size: 11pt;
    line-height: 1.6;
    color: #000;
  }

  /* 居中大标题 */
  .doc-title {
    text-align: center;
    font-size: 30pt;
    font-weight: 700;
    letter-spacing: 0.25em;
    margin: 28pt 0 34pt;
    color: #000;
  }

  /* 标题下信息行：标签 + 加粗下划线的值 */
  .doc-info { margin: 0 0 8pt 4em; }
  .doc-info p { margin: 0 0 10pt; font-size: 13pt; }
  .doc-info .doc-label { display: inline-block; min-width: 5.5em; }
  .doc-info .doc-value {
    font-weight: 700;
    text-decoration: underline;
    text-underline-offset: 3pt;
    text-decoration-thickness: 1pt;
  }

  /* 灰色斜纹横幅条 */
  .doc-banner {
    border: 1px solid #aaa;
    background: repeating-linear-gradient(45deg, #ececec 0 5px, #fafafa 5px 10px);
    padding: 3pt 8pt;
    font-size: 10.5pt;
    margin: 14pt 0 10pt;
    page-break-after: avoid;
  }
  .doc-banner.page-break {
    page-break-before: always;
    margin-top: 0;
  }

  /* 教案表格：黑色细线 */
  table.doc-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 12pt;
  }
  table.doc-table th, table.doc-table td {
    border: 1px solid #000;
    padding: 6pt 8pt;
    vertical-align: top;
    text-align: left;
    word-break: break-word;
  }
  table.doc-table th {
    width: 15%;
    font-weight: 400;
    text-align: center;
    vertical-align: middle;
  }
  tr { page-break-inside: avoid; }

  /* 空内容单元格保留最小高度，便于打印后手写 */
  table.doc-table td.doc-multiline { min-height: 26pt; }

  /* 讲稿部分大表 */
  table.doc-table th.doc-process-head {
    width: auto;
    text-align: center;
    font-size: 14pt;
    letter-spacing: 0.2em;
    padding: 8pt;
  }
  td.doc-process-content { width: 78%; }
  td.doc-process-remarks { width: 22%; }
  td.doc-row-label { letter-spacing: 0.1em; }
  td.doc-tall { height: 80pt; }

  /* 多级讲稿列表：与编辑器一致的圆点 + 悬挂缩进（所见即所得） */
  table.doc-table td.doc-process-content ul {
    margin: 0;
    padding-left: 1.5em;
    list-style-type: disc;
  }
  table.doc-table td.doc-process-content ul ul { list-style-type: circle; }
  table.doc-table td.doc-process-content ul ul ul { list-style-type: square; }
  table.doc-table td.doc-process-content > ul > li { font-weight: 700; }
  table.doc-table td.doc-process-content li { margin: 3pt 0; }
  table.doc-table .doc-bullet { padding-left: 1.6em; text-indent: -1.3em; margin: 2pt 0; }
}

/* ---------- 响应式 ---------- */

@media (max-width: 900px) {
  .app-shell { flex-direction: column; }
  .app-rail { width: 100%; flex-direction: row; align-items: center; padding: 14px 18px; gap: 18px; }
  .app-rail .brand { border-bottom: none; padding-bottom: 0; }
  .app-rail nav { flex-direction: row; }
  .app-rail .rail-tabs { flex-direction: row; align-items: center; max-height: none; overflow-y: hidden; overflow-x: auto; flex: 1; gap: 4px; min-width: 0; }
  .app-rail .rail-tabs-head { display: none; }
  .app-rail .rail-tab { border-left: none; border-bottom: 3px solid transparent; padding: 5px 8px; flex-shrink: 0; }
  .app-rail .rail-tab.active { border-left-color: transparent; border-bottom-color: var(--pencil-red); }
  .rail-tab-title { max-width: 120px; }
  .app-rail .rail-foot { display: none; }
  .app-main { padding: 24px; }
  .field-grid { grid-template-columns: 1fr; }
}