/* Doc-02 集成教学页面 · 样式（基于 doc-01 改造） */

/* Doc-02 专用样式 */
.code-purpose {
  font-size: 13px;
  color: #475569;
  margin: 8px 0;
  padding-left: 12px;
  border-left: 3px solid #cbd5e1;
}

/* ---------- 流程图节点（D4.1） ---------- */
.flow-svg text { font-family: inherit; font-size: 13px; fill: #1e293b; }
.flow-svg .node rect {
  fill: white;
  stroke: #94a3b8;
  stroke-width: 1.5;
  rx: 6;
  ry: 6;
  cursor: pointer;
  transition: stroke 0.2s, fill 0.2s;
}
.flow-svg .node:hover rect { fill: #fef3c7; stroke: #f59e0b; }
.flow-svg .node.selected rect { fill: #dbeafe; stroke: #2563eb; stroke-width: 2.5; }
.flow-svg .node-label { pointer-events: none; font-weight: 600; }
.flow-svg .arrow { stroke: #cbd5e1; stroke-width: 2; fill: none; marker-end: url(#arrowhead); }
.flow-svg .arrow-label { font-size: 11px; fill: #64748b; }
.flow-detail {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  padding: 14px 16px;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: #334155;
  min-height: 80px;
}

/* ---------- 树节点（D4.2 / D4.3 / D4.4） ---------- */
.tree-svg { width: 100%; display: block; }
.tree-svg .link {
  fill: none;
  stroke: #cbd5e1;
  stroke-width: 1.5;
}
.tree-svg .node circle {
  fill: white;
  stroke: #6366f1;
  stroke-width: 2;
  cursor: pointer;
  transition: all 0.2s;
}
.tree-svg .node:hover circle { fill: #eef2ff; stroke: #4338ca; stroke-width: 3; }
.tree-svg .node.collapsed > circle { fill: #fef3c7; stroke: #f59e0b; }
.tree-svg .node text {
  font-size: 12px;
  fill: #1e293b;
  pointer-events: none;
}
.tree-svg .node text.weight { font-size: 11px; fill: #6b7280; }

/* 树布局可视化（D4.3） */
.tree-layout-svg .coord-bg {
  fill: #f8fafc;
  stroke: #e2e8f0;
  stroke-width: 1;
}
.tree-layout-svg .axis text { font-size: 10px; fill: #94a3b8; }
.tree-layout-svg .axis line { stroke: #cbd5e1; stroke-width: 1; stroke-dasharray: 2 2; }

/* 树列表（D4.4） */
.tree-list {
  font-family: -apple-system, "PingFang SC", sans-serif;
  font-size: 13px;
  line-height: 1.8;
  padding: 8px 0;
}
.tree-list ul { list-style: none; padding-left: 20px; border-left: 1px dashed #cbd5e1; margin: 2px 0; transition: opacity 0.2s ease; }
.tree-list > ul { padding-left: 0; border-left: none; }
.tree-list li { margin: 2px 0; cursor: pointer; }
.tree-list li > .label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 4px;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  transition: all 0.15s;
  font-size: 13px;
}
.tree-list li > .label:hover {
  background: #eef2ff;
  border-color: #6366f1;
  color: #1e1b4b;
}
.tree-list li.selected > .label {
  background: #dbeafe;
  border-color: #2563eb;
  color: #1e40af;
  font-weight: 600;
}
.tree-list .toggle {
  display: inline-block;
  width: 14px;
  text-align: center;
  font-weight: 700;
  color: #6366f1;
}
.tree-list .count {
  font-size: 11px;
  color: #6b7280;
  background: #f1f5f9;
  padding: 1px 6px;
  border-radius: 8px;
  margin-left: 4px;
}

/* ---------- 控制条（共用） ---------- */
.controls {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  margin: 10px 0;
}
.controls label { font-size: 13px; color: #475569; }
.controls select, .controls input {
  padding: 4px 8px;
  border-radius: 4px;
  border: 1px solid #cbd5e1;
  font-size: 13px;
  font-family: inherit;
  background: white;
}
.controls input[type=range] { width: 160px; }
.demo-btn {
  padding: 6px 14px;
  background: #2563eb;
  color: white;
  border: none;
  border-radius: 4px;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
}
.demo-btn:hover { background: #1d4ed8; }
.demo-btn.secondary { background: #64748b; }
.demo-btn.secondary:hover { background: #475569; }

.demo-legend {
  font-size: 12px;
  color: #64748b;
  margin: 8px 0;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  line-height: 1.65;
  color: #1f2937;
  background: #f8fafc;
}

.lesson-header {
  background: linear-gradient(135deg, #1e293b, #0f172a);
  color: #f1f5f9;
  padding: 20px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 3px solid #2563eb;
}

.lesson-header h1 { font-size: 22px; font-weight: 600; }
.subtitle { color: #94a3b8; font-size: 13px; margin-top: 4px; }

.header-tip { font-size: 12px; color: #94a3b8; }
.kbd {
  display: inline-block;
  background: #334155;
  color: #e2e8f0;
  padding: 1px 6px;
  border-radius: 3px;
  font-family: monospace;
  font-size: 11px;
}

.lesson-main {
  display: grid;
  grid-template-columns: 220px 1fr;
  max-width: 1400px;
  margin: 0 auto;
  gap: 24px;
  padding: 24px 32px;
}

.chapter-nav {
  position: sticky;
  top: 20px;
  align-self: start;
  background: white;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 16px;
  height: fit-content;
}

.chapter-nav h3 {
  font-size: 12px;
  color: #64748b;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.chapter-nav ul { list-style: none; }
.chapter-nav li { margin: 4px 0; }
.chapter-nav a {
  display: block;
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 13px;
  color: #334155;
  text-decoration: none;
  border-left: 3px solid transparent;
}
.chapter-nav a:hover { background: #f1f5f9; }
.chapter-nav a.active {
  background: #eff6ff;
  color: #1d4ed8;
  border-left-color: #2563eb;
  font-weight: 600;
}
.nav-tip {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid #e2e8f0;
  font-size: 12px;
}
.nav-tip a { display: block; padding: 4px 0; color: #2563eb; }

.chapter-content {
  background: white;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
  overflow: hidden;
}

.chapter { display: block; padding: 28px 36px 36px; }
.chapter.active { display: block; }

.chapter h2 {
  font-size: 22px;
  color: #0f172a;
  margin-bottom: 6px;
}
.chapter-subtitle {
  color: #64748b;
  font-size: 13px;
  margin-bottom: 20px;
}

/* ---------- Tab 切换 ---------- */
.tabs {
  display: flex;
  gap: 4px;
  border-bottom: 2px solid #e2e8f0;
  margin-bottom: 24px;
}
.tab-btn {
  padding: 10px 18px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  font-size: 13px;
  font-family: inherit;
  color: #64748b;
  font-weight: 500;
}
.tab-btn:hover { color: #1f2937; background: #f8fafc; }
.tab-btn.active {
  color: #2563eb;
  border-bottom-color: #2563eb;
}

.tab-panel { display: none; animation: fade-in 200ms; }
.tab-panel.active { display: block; }

@keyframes fade-in {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 讲解区 ---------- */
.tab-panel h3 {
  font-size: 16px;
  color: #1e293b;
  margin: 20px 0 10px;
}
.tab-panel h3:first-child { margin-top: 0; }
.tab-panel p { color: #334155; margin: 8px 0; }
.tab-panel ul, .tab-panel ol { margin: 8px 0 12px 24px; }
.tab-panel li { margin: 4px 0; color: #334155; }
.tab-panel code {
  background: #f1f5f9;
  padding: 1px 6px;
  border-radius: 3px;
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: 12.5px;
  color: #be185d;
}

.note {
  background: #fffbeb;
  border-left: 3px solid #f59e0b;
  padding: 12px 16px;
  margin: 12px 0;
  font-size: 13px;
  color: #78350f;
  border-radius: 0 4px 4px 0;
}

.theory-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin: 12px 0;
}
.theory-table th, .theory-table td {
  border: 1px solid #e2e8f0;
  padding: 8px 12px;
  text-align: left;
}
.theory-table th { background: #f8fafc; color: #475569; font-weight: 600; }
.theory-table tr:nth-child(even) td { background: #f8fafc; }

/* ---------- 理论插图（视觉通道 5 图） ---------- */
.theory-figure {
  margin: 16px 0;
  padding: 10px;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
}
.theory-figure img {
  display: block;
  width: 100%;
  max-width: 720px;
  height: auto;
  margin: 0 auto;
  border-radius: 4px;
}
.theory-figure figcaption {
  font-size: 12px;
  color: #64748b;
  margin-top: 8px;
  text-align: center;
  line-height: 1.5;
}

/* ---------- 数据变换四操作表 ---------- */
.theory-table code {
  background: #f1f5f9;
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 12px;
}

/* ---------- 代码区 ---------- */
pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 14px 18px;
  border-radius: 6px;
  overflow-x: auto;
  margin: 10px 0;
  font-size: 13px;
  line-height: 1.7;
}
pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: 13px;
}

/* 语法高亮（极简自实现） */
pre .cmt { color: #64748b; font-style: italic; }
pre .kw  { color: #f472b6; }   /* 关键字 */
pre .fn  { color: #60a5fa; }   /* 函数名 */
pre .str { color: #86efac; }   /* 字符串 */
pre .num { color: #fbbf24; }   /* 数字 */
pre .op  { color: #fb923c; }   /* 操作符 */
pre .cls { color: #f472b6; }   /* 类名 */
pre .star { color: #fbbf24; font-weight: 700; }

.code-purpose {
  font-size: 13px;
  color: #475569;
  margin: 8px 0;
  padding-left: 12px;
  border-left: 3px solid #cbd5e1;
}

.key-point {
  background: #f0f9ff;
  border-left: 3px solid #0284c7;
  padding: 10px 14px;
  margin: 8px 0 16px;
  font-size: 13px;
  color: #0c4a6e;
  border-radius: 0 4px 4px 0;
}
.key-point strong { color: #075985; }

/* ---------- 演示区 ---------- */
.demo-hint {
  background: #f0f9ff;
  padding: 10px 14px;
  border-radius: 4px;
  font-size: 13px;
  color: #0c4a6e;
  margin-bottom: 12px;
}

.demo-mount {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  padding: 16px;
  min-height: 200px;
}
.demo-mount svg { display: block; margin: 8px 0; }

.demo-sub {
  background: white;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  padding: 12px;
  margin: 12px 0;
}
.demo-sub h4 {
  font-size: 13px;
  color: #475569;
  margin-bottom: 8px;
  font-weight: 600;
}

.demo-btn {
  padding: 6px 14px;
  background: #2563eb;
  color: white;
  border: none;
  border-radius: 4px;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
  margin: 4px 4px 4px 0;
}
.demo-btn:hover { background: #1d4ed8; }

.demo-detail {
  background: white;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  padding: 14px;
  font-size: 13px;
  color: #475569;
  min-height: 140px;
}
.demo-detail h4 { color: #1e293b; margin-bottom: 6px; }

.demo-legend {
  font-size: 12px;
  color: #64748b;
  margin-top: 8px;
}

.console {
  background: #0f172a;
  color: #cbd5e1;
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: 12px;
  padding: 12px 16px;
  border-radius: 6px;
  max-height: 280px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
  margin: 8px 0;
}

.controls {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  margin: 12px 0;
}
.controls select {
  padding: 5px 10px;
  border: 1px solid #cbd5e1;
  border-radius: 4px;
  font-size: 13px;
  font-family: inherit;
}

.lesson-footer {
  text-align: center;
  color: #94a3b8;
  font-size: 12px;
  padding: 24px;
  border-top: 1px solid #e2e8f0;
}

/* === 章节翻页导航 === */
.chapter-pager {
  display: flex;
  align-items: stretch;
  gap: 12px;
  margin: 32px auto 24px;
  max-width: 960px;
  padding: 0 24px;
}
.chapter-pager a, .chapter-pager span {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 14px 20px;
  border-radius: 8px;
  text-decoration: none;
  background: white;
  border: 1px solid #e2e8f0;
  transition: all 0.15s;
  min-height: 60px;
}
.chapter-pager a:hover {
  background: #eef2ff;
  border-color: #c7d2fe;
  transform: translateY(-1px);
}
.chapter-pager .pager-prev { text-align: left; }
.chapter-pager .pager-next { text-align: right; }
.chapter-pager .pager-portal {
  flex: 0 0 auto;
  text-align: center;
  background: #eef2ff;
  color: #4338ca;
  font-weight: 600;
  padding: 14px 18px;
}
.chapter-pager .pager-portal:hover {
  background: #c7d2fe;
  color: #1e1b4b;
}
.chapter-pager .pager-dir {
  font-size: 12px;
  color: #64748b;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}
.chapter-pager .pager-title {
  font-size: 15px;
  color: #1e293b;
  font-weight: 600;
}
.chapter-pager a:hover .pager-title { color: #4338ca; }
.chapter-pager .empty { background: transparent; border: none; }
@media (max-width: 640px) {
  .chapter-pager { flex-direction: column; }
  .chapter-pager a, .chapter-pager span { text-align: center; }
  .chapter-pager .pager-prev, .chapter-pager .pager-next { text-align: center; }
}

/* === AUTO-INJECTED BY sync_lesson.py (TOPBAR-CSS-START) === */

/* 行内 <code> 与高亮类冲突修复 */
.tab-panel code {
  background: #1e293b;
  color: #f1f5f9;
  padding: 2px 7px;
  border-radius: 4px;
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: 13px;
  border: 1px solid #334155;
}
.tab-panel code .cmt,
.tab-panel code .kw,
.tab-panel code .fn,
.tab-panel code .str,
.tab-panel code .num,
.tab-panel code .op,
.tab-panel code .cls,
.tab-panel code .star {
  color: inherit !important;
  background: transparent !important;
  font-weight: inherit !important;
  font-style: inherit !important;
}
.key-point code,
.note code,
.tab-panel li code,
.tab-panel p code,
.tab-panel td code {
  margin: 0 2px;
}

/* === 顶部全局导航 === */
.course-topbar {
  position: sticky;
  top: 0;
  display: flex;
  align-items: center;
  gap: 18px;
  background: white;
  border-bottom: 1px solid #e2e8f0;
  padding: 10px 20px;
  z-index: 200;
  font-size: 14px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}
.course-topbar .brand {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #4338ca;
  text-decoration: none;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 6px;
  background: #eef2ff;
  transition: all 0.15s;
  white-space: nowrap;
}
.course-topbar .brand:hover {
  background: #c7d2fe;
  color: #1e1b4b;
}
.course-topbar .brand .back { font-size: 16px; font-weight: 700; }
.course-topbar ul.tabs {
  list-style: none;
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  flex: 1;
  overflow-x: auto;
  min-width: 0;
}
.course-topbar ul.tabs a {
  padding: 6px 12px;
  border-radius: 6px;
  text-decoration: none;
  color: #475569;
  white-space: nowrap;
  transition: all 0.15s;
  display: inline-block;
}
.course-topbar ul.tabs a:hover { background: #f1f5f9; color: #1f2937; }
.course-topbar ul.tabs a.current { background: #4338ca; color: white; font-weight: 600; }
.course-topbar ul.tabs a.current:hover { background: #3730a3; color: white; }

@media (max-width: 640px) {
  .course-topbar { flex-wrap: wrap; padding: 8px 12px; gap: 10px; }
  .course-topbar ul.tabs { width: 100%; flex-basis: 100%; }
  .course-topbar ul.tabs a { padding: 5px 8px; font-size: 13px; }
}

/* === AUTO-INJECTED BY sync_lesson.py (TOPBAR-CSS-END) === */