/* ===== 变量与重置 ===== */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --accent: #f59e0b;
  --success: #10b981;
  --danger: #ef4444;
  --bg: #f8fafc;
  --surface: #ffffff;
  --sidebar-bg: #1e293b;
  --sidebar-text: #e2e8f0;
  --sidebar-hover: #334155;
  --sidebar-active: #2563eb;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.15);
  --sidebar-width: 280px;
  --transition: 0.2s ease;
}
[data-theme="dark"] {
  --bg: #0f172a;
  --surface: #1e293b;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --border: #334155;
  --sidebar-bg: #020617;
  --sidebar-text: #cbd5e1;
  --sidebar-hover: #1e293b;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow: hidden;
  height: 100vh;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
button { cursor: pointer; border: none; background: none; font: inherit; }
input, textarea { font: inherit; }
img { max-width: 100%; display: block; }

/* ===== 布局 ===== */
#app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ===== 侧边栏 ===== */
#sidebar {
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  height: 100vh;
  overflow: hidden;
  transition: transform var(--transition);
  z-index: 100;
}
.sidebar-header {
  padding: 20px 16px 12px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.sidebar-header h1 {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}
.sidebar-header .subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.search-box { position: relative; }
.search-box input {
  width: 100%;
  padding: 8px 12px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius);
  color: #fff;
  font-size: 0.85rem;
}
.search-box input::placeholder { color: rgba(255,255,255,0.4); }
.search-box input:focus { outline: none; border-color: var(--primary-light); }
#search-results {
  position: absolute;
  top: 100%;
  left: 0; right: 0;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  max-height: 300px;
  overflow-y: auto;
  display: none;
  z-index: 200;
}
#search-results.show { display: block; }
.search-result-item {
  padding: 8px 12px;
  font-size: 0.85rem;
  color: var(--text);
  width: 100%;
  text-align: left;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
}
.search-result-item:hover { background: var(--bg); }
.search-result-item:focus-visible { outline: 2px solid var(--primary); outline-offset: -2px; background: var(--bg); }
.search-result-item:last-child { border-bottom: none; }

/* ===== 导航 ===== */
#chapter-nav {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}
.nav-group { border-bottom: 1px solid rgba(255,255,255,0.06); }
.nav-group-header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 16px;
  font-size: 0.82rem;
  font-weight: 600;
  color: #fff;
  background: none;
  transition: background var(--transition);
}
.nav-group-header:hover { background: var(--sidebar-hover); }
.nav-group-header::after {
  content: "▼";
  font-size: 0.6rem;
  transition: transform var(--transition);
}
.nav-group-header.open::after { transform: rotate(180deg); }
.chapter-count {
  font-size: 0.7rem;
  font-weight: 400;
  color: rgba(255,255,255,0.5);
  background: rgba(255,255,255,0.1);
  padding: 2px 6px;
  border-radius: 10px;
}
.nav-group-content {
  display: none;
  padding: 4px 0 8px;
}
.nav-group-content.open { display: block; }
.nav-item {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 6px 16px 6px 28px;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.7);
  cursor: pointer;
  transition: all var(--transition);
  gap: 6px;
}
.nav-item:hover { background: var(--sidebar-hover); color: #fff; }
.nav-item:focus-visible,
.nav-group-header:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.nav-item.active { background: var(--sidebar-active); color: #fff; border-radius: 4px; margin: 0 8px; width: calc(100% - 16px); }
.nav-item .nav-num { font-size: 0.7rem; opacity: 0.5; min-width: 16px; }

/* 章节链接（nav-item 和 chapter-link 共享样式）*/
a.chapter-link {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 6px 16px 6px 28px;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.7);
  cursor: pointer;
  transition: all var(--transition);
  gap: 6px;
  text-decoration: none;
}
a.chapter-link:hover { background: var(--sidebar-hover); color: #fff; }
a.chapter-link.active { background: var(--sidebar-active); color: #fff; border-radius: 4px; margin: 0 8px; width: calc(100% - 16px); }
a.chapter-link .nav-num { font-size: 0.7rem; opacity: 0.5; min-width: 16px; }

/* ===== 侧边栏底部进度 ===== */
.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid rgba(255,255,255,0.1);
  background: rgba(0,0,0,0.2);
}
.progress-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: 6px;
}
.progress-bar {
  height: 4px;
  background: rgba(255,255,255,0.15);
  border-radius: 2px;
  overflow: hidden;
}
#progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  width: 0%;
  transition: width 0.5s ease;
  border-radius: 2px;
}

/* ===== 主内容区 ===== */
#main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* 顶部栏 */
#topbar {
  display: none;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  height: 48px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
#menu-toggle { font-size: 1.2rem; color: var(--text); }
#current-chapter-title { flex: 1; font-size: 0.9rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#theme-toggle { font-size: 1rem; }

/* 内容区 */
#content-wrapper {
  flex: 1;
  overflow-y: auto;
  padding: 32px 40px;
  height: 100%;
}
.chapter-section { display: none; max-width: 900px; margin: 0 auto; }
.chapter-section.active { display: block; }

/* 欢迎页 */
.welcome-hero {
  text-align: center;
  padding: 40px 20px 32px;
}
.welcome-hero h1 { font-size: 2rem; font-weight: 800; margin-bottom: 8px; background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.welcome-hero .lead { font-size: 1.1rem; color: var(--text-muted); margin-bottom: 20px; }
.welcome-badges { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-bottom: 24px; }
.welcome-badges .badge {
  padding: 4px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.welcome-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}
.welcome-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.welcome-card:hover { border-color: var(--primary); box-shadow: var(--shadow); transform: translateY(-2px); }
.welcome-card .card-icon { font-size: 2rem; margin-bottom: 8px; }
.welcome-card h3 { font-size: 1rem; margin-bottom: 6px; }
.welcome-card p { font-size: 0.82rem; color: var(--text-muted); line-height: 1.5; margin-bottom: 8px; }
.welcome-card .card-count { font-size: 0.75rem; color: var(--primary); font-weight: 600; }

.welcome-features { margin-bottom: 32px; }
.welcome-features h2 { font-size: 1.2rem; margin-bottom: 16px; }
.feature-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 12px; }
.feature-item {
  display: flex;
  gap: 12px;
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.feature-icon { font-size: 1.4rem; flex-shrink: 0; }
.feature-item h4 { font-size: 0.9rem; margin-bottom: 4px; }
.feature-item p { font-size: 0.8rem; color: var(--text-muted); }

.welcome-start { text-align: center; margin-bottom: 32px; }
.btn-primary {
  display: inline-block;
  padding: 10px 24px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
  border: none;
  cursor: pointer;
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow); text-decoration: none; }
.btn-large { padding: 14px 36px; font-size: 1.05rem; }

/* ===== 欢迎页增强 ===== */
.welcome-cta {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 20px;
}
.btn-secondary {
  padding: 10px 20px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  background: var(--surface);
  border: 1.5px solid var(--border);
  color: var(--text);
  cursor: pointer;
  transition: all var(--transition);
}
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-1px); }
.btn-ghost {
  padding: 10px 20px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  background: transparent;
  border: 1.5px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
}
.btn-ghost:hover { border-color: var(--text-muted); color: var(--text); }

.task-nav { margin-bottom: 32px; }
.task-nav h2 { font-size: 1.1rem; margin-bottom: 14px; color: var(--text); }
.task-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
}
.task-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 3px;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  text-align: left;
}
.task-item:hover { border-color: var(--primary); transform: translateY(-1px); box-shadow: var(--shadow); }
.task-icon { font-size: 1.3rem; }
.task-name { font-size: 0.85rem; font-weight: 600; color: var(--text); }
.task-meta { font-size: 0.72rem; color: var(--text-muted); }

.welcome-card .card-desc { font-size: 0.8rem; color: var(--primary); font-weight: 500; margin-bottom: 4px; }
.welcome-card .card-scenes { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 4px; }
.welcome-card .card-methods { font-size: 0.75rem; color: var(--text-muted); }

#site-footer {
  margin-top: 48px;
  padding: 24px 0 8px;
  border-top: 1px solid var(--border);
}
.footer-ack {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.8;
  text-align: center;
}
.footer-ack a { color: var(--primary); text-decoration: none; }
.footer-ack a:hover { text-decoration: underline; }
.footer-author {
  margin-top: 10px;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
}
.footer-author a { color: var(--primary); text-decoration: none; font-weight: 600; }

/* ===== 侧边栏进度增强 ===== */
.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid rgba(255,255,255,0.1);
  background: rgba(0,0,0,0.2);
  display: flex;
  align-items: center;
  gap: 12px;
}
.progress-ring-container {
  flex-shrink: 0;
  position: relative;
  width: 52px;
  height: 52px;
}
.progress-ring { transform: rotate(-90deg); }
.progress-ring-track {
  fill: none;
  stroke: rgba(255,255,255,0.12);
  stroke-width: 4;
}
.progress-ring-fill {
  fill: none;
  stroke: var(--primary);
  stroke-width: 4;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.6s ease;
}
.progress-ring-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.progress-pct {
  font-size: 0.65rem;
  font-weight: 700;
  color: rgba(255,255,255,0.9);
}
.progress-meta { flex: 1; min-width: 0; }
.progress-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: 4px;
}
.progress-bar {
  height: 3px;
  background: rgba(255,255,255,0.12);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 5px;
}
#progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  width: 0%;
  transition: width 0.5s ease;
  border-radius: 2px;
}
.last-chapter {
  font-size: 0.68rem;
  color: rgba(255,255,255,0.45);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 4px;
}
.btn-continue {
  font-size: 0.7rem;
  padding: 3px 8px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  width: 100%;
  transition: background 0.2s;
}
.btn-continue:hover { background: var(--primary-dark); }

/* ===== 学习路线 ===== */
.learning-paths { margin-bottom: 32px; }
.learning-paths h2 { font-size: 1.05rem; margin-bottom: 14px; }
.path-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.path-tab {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}
.path-tab.active, .path-tab:hover {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}
.path-content { display: none; }
.path-content.active { display: block; }
.path-list { list-style: none; padding: 0; margin: 0; }
.path-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  font-size: 0.82rem;
  color: var(--text);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s;
}
.path-list li:hover { background: var(--surface); }
.path-num {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.path-title { flex: 1; }
.path-tag {
  font-size: 0.65rem;
  padding: 2px 6px;
  border-radius: 10px;
  background: rgba(255,255,255,0.08);
  color: var(--text-muted);
}
.path-tag.basic { background: rgba(16,185,129,0.15); color: #10b981; }
.path-tag.adv { background: rgba(139,92,246,0.15); color: #8b5cf6; }
.path-tag.lit { background: rgba(245,158,11,0.15); color: #f59e0b; }

/* ===== 章节内容 ===== */
.chapter-header {
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--border);
}
.chapter-header .chapter-category {
  font-size: 0.75rem;
  color: var(--primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}
.chapter-header h2 { font-size: 1.6rem; font-weight: 700; margin-bottom: 6px; }
.chapter-header .chapter-meta { font-size: 0.8rem; color: var(--text-muted); }
.chapter-nav-btns {
  display: flex;
  justify-content: space-between;
  margin-bottom: 24px;
  gap: 12px;
}
.chapter-nav-btn {
  padding: 6px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.82rem;
  color: var(--text);
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}
.chapter-nav-btn:hover { border-color: var(--primary); color: var(--primary); }

/* 内容区块 */
.content-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 16px;
}
.content-block h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}
.content-block h3 .icon { font-size: 1.1rem; }
.content-block h4 { font-size: 0.95rem; font-weight: 600; margin: 14px 0 8px; }
.content-block p { font-size: 0.88rem; margin-bottom: 10px; line-height: 1.8; }
.content-block ul, .content-block ol { padding-left: 20px; margin-bottom: 10px; }
.content-block li { font-size: 0.88rem; margin-bottom: 4px; line-height: 1.7; }

/* 统计概念卡片 */
.stat-concept {
  background: linear-gradient(135deg, #eff6ff, #f0f9ff);
  border-left: 4px solid var(--primary);
  padding: 16px 20px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-bottom: 16px;
}
[data-theme="dark"] .stat-concept { background: linear-gradient(135deg, #1e293b, #1e3a5f); }
.stat-concept h4 { color: var(--primary); font-size: 0.9rem; margin-bottom: 6px; }
.stat-concept p { font-size: 0.85rem; color: var(--text); margin: 0; }

/* 公式 */
.formula-block {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 12px;
  text-align: center;
  font-size: 0.95rem;
}

/* ===== 三线表 ===== */
.table-wrapper {
  overflow-x: auto;
  margin-bottom: 16px;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.84rem;
}
th, td {
  padding: 8px 12px;
  border: 1px solid var(--border);
  text-align: left;
}
th {
  background: var(--bg);
  font-weight: 600;
  text-align: center;
}
.table-top { border-top: 2px solid var(--text); }
.table-bottom { border-bottom: 2px solid var(--text); }
.table-middle { border-collapse: collapse; }
.table-middle td { border: 1px solid var(--border); text-align: center; }
.table-middle th { border: 1px solid var(--border); text-align: center; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  #app { flex-direction: column; }
  #sidebar {
    position: fixed;
    top: 0; left: 0;
    width: 85vw;
    max-width: 320px;
    height: 100vh;
    transform: translateX(-100%);
    z-index: 200;
  }
  #sidebar.open { transform: translateX(0); }
  #sidebar.overlay::before {
    content: "";
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: -1;
  }
  #topbar { display: flex; }
  #content-wrapper { padding: 20px 16px; }
  .welcome-hero h1 { font-size: 1.5rem; }
  .welcome-grid { grid-template-columns: 1fr 1fr; }
  .feature-list { grid-template-columns: 1fr; }
  .content-block { padding: 14px 16px; }
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.2); border-radius: 3px; }
[data-theme="dark"] ::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); }

/* ===== 加载动画 ===== */
.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid color-mix(in srgb, var(--primary) 22%, transparent);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== 提示框 ===== */
.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: #1e293b;
  color: #fff;
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 0.85rem;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.toast.show { opacity: 1; }

/* ===== 加载和错误状态 ===== */
.loading {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
  font-size: 0.9rem;
}
.error {
  text-align: center;
  padding: 40px;
  color: var(--danger, #ef4444);
  font-size: 0.9rem;
}

/* ===== 代码块基础样式（Quarto 生成的 pre.sourceCode）===== */
pre.sourceCode {
  background: #1e1e1e !important;
  color: #d4d4d4;
  padding: 16px;
  border-radius: 6px;
  overflow-x: auto;
  font-family: "JetBrains Mono", "Fira Code", Consolas, monospace;
  font-size: 0.82rem;
  line-height: 1.6;
  margin-bottom: 16px;
  position: relative;
}
[data-theme="dark"] pre.sourceCode {
  background: #111827 !important;
}
code.sourceCode {
  font-family: inherit;
  background: none !important;
}

/* 行内代码 */
/* ===== highlight.js 语法高亮（Quarto 生成的 span class）===== */
pre.sourceCode .co, pre.sourceCode .comment, pre.sourceCode .hljs-comment { color: #6a9955; }       /* 注释 gray */
pre.sourceCode .ot, pre.sourceCode .hljs-tag { color: #c586c0; }                                    /* 其他关键字 purple */
pre.sourceCode .kw, pre.sourceCode .keyword, pre.sourceCode .hljs-keyword { color: #569cd6; }       /* 关键字 blue */
pre.sourceCode .do, pre.sourceCode .hljs-doctag { color: #608b4e; }                                 /* 文档标签 green */
pre.sourceCode .dt, pre.sourceCode .hljs-title, pre.sourceCode .hljs-type { color: #4ec9b0; }      /* 数据类型 teal */
pre.sourceCode .fu, pre.sourceCode .hljs-name, pre.sourceCode .hljs-built_in { color: #dcdcaa; }   /* 函数 yellow */
pre.sourceCode .st, pre.sourceCode .hljs-string { color: #ce9178; }                                  /* 字符串 orange */
pre.sourceCode .at, pre.sourceCode .hljs-attr, pre.sourceCode .hljs-attribute { color: #9cdcfe; } /* 属性 light blue */
pre.sourceCode .dv, pre.sourceCode .hljs-number, pre.sourceCode .hljs-literal { color: #b5cea8; }   /* 数字 light green */
pre.sourceCode .op, pre.sourceCode .hljs-operator { color: #d4d4d4; }                                /* 操作符 white */
pre.sourceCode .al, pre.sourceCode .hljs-alert { color: #d16969; }                                   /* 警告 red */
pre.sourceCode .pp, pre.sourceCode .hljs-preprocessor { color: #9cdcfe; }                            /* 预处理器 cyan */
pre.sourceCode .sc, pre.sourceCode .hljs-string .sc { color: #d7ba7d; }                              /* 特殊字符串 gold */
pre.sourceCode .ss, pre.sourceCode .hljs-symbol { color: #d7ba7d; }                                  /* 符号 gold */
pre.sourceCode .vs, pre.sourceCode .hljs-variable { color: #9cdcfe; }                               /* 变量 light blue */
pre.sourceCode .wa, pre.sourceCode .instruction { color: #d7ba7d; }                                  /* ARM 指令 gold */
pre.sourceCode .cn, pre.sourceCode .hljs-constant { color: #4ec9b0; }                               /* 常量 teal */
pre.sourceCode .ex, pre.sourceCode .hljs-params { color: #dcdcaa; }                                  /* 参数 yellow */
pre.sourceCode .pd, pre.sourceCode .hljs-property { color: #9cdcfe; }                                /* 属性 light blue */
pre.sourceCode .ch, pre.sourceCode .hljs-char { color: #ce9178; }                                       /* 字符 orange */

/* 行内代码 */
:not(pre) > code {
  background: var(--bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85em;
  font-family: monospace;
  color: var(--danger, #dc2626);
  border: 1px solid var(--border);
}
[data-theme="dark"] :not(pre) > code {
  background: #1e293b;
  border-color: #334155;
}

/* ===== 提示框（callout）===== */
.callout {
  border-radius: 6px;
  margin-bottom: 16px;
  border: 1px solid var(--border);
  overflow: hidden;
}
.callout.callout-warning { border-color: #f59e0b; background: #fffbeb; }
.callout.callout-note { border-color: #3b82f6; background: #eff6ff; }
.callout.callout-tip { border-color: #10b981; background: #f0fdf4; }
.callout.callout-important { border-color: #ef4444; background: #fef2f2; }
.callout-header {
  padding: 8px 14px;
  background: rgba(0,0,0,0.05);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}
.callout-toggle { color: var(--text-muted); font-size: 0.75rem; }
.callout-collapsed .callout-header { border-bottom: none; }
.callout-collapsed > *:not(.callout-header) { display: none; }

/* ===== 统计可视化与计算器 ===== */
.viz-card, .calc-card {
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 10px;
  margin: 24px 0;
  overflow: hidden;
  background: var(--card-bg, #f8fafc);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
[data-theme="dark"] .viz-card, [data-theme="dark"] .calc-card {
  background: #1e2535;
  border-color: #2d3748;
}
.viz-header, .calc-header {
  padding: 12px 16px;
  background: var(--nav-bg, #f1f5f9);
  border-bottom: 1px solid var(--border, #e2e8f0);
  font-weight: 600;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
[data-theme="dark"] .viz-header, [data-theme="dark"] .calc-header {
  background: #111827;
  border-color: #2d3748;
}
.viz-reset {
  background: none;
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
  padding: 2px 8px;
  color: var(--text-muted, #64748b);
}
.viz-reset:hover { background: var(--border, #e2e8f0); }

.viz-sliders {
  padding: 12px 16px 4px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.viz-sliders label {
  font-size: 0.82rem;
  color: var(--text-muted, #64748b);
  display: flex;
  align-items: center;
  gap: 8px;
}
.viz-val {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  color: var(--text, #1e293b);
  min-width: 32px;
}
[data-theme="dark"] .viz-val { color: #e2e8f0; }

.viz-slider {
  flex: 1;
  accent-color: #569cd6;
  margin-left: 8px;
  cursor: pointer;
}
.viz-stats {
  padding: 8px 16px 12px;
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--text-muted, #64748b);
  flex-wrap: wrap;
}
.viz-stats strong { color: #569cd6; }

.viz-legend {
  padding: 6px 16px 12px;
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  flex-wrap: wrap;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted, #64748b);
}
.legend-item::before {
  content: '';
  display: inline-block;
  width: 20px;
  height: 3px;
  background: currentColor;
  border-radius: 2px;
}

/* P 值显示 */
.viz-pvalue-display {
  padding: 10px 16px 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: baseline;
}
.pvalue-result { display: flex; align-items: baseline; gap: 6px; }
.pvalue-label { font-size: 0.82rem; color: var(--text-muted, #64748b); }
.pvalue-num, .pvalue-num-side {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.2rem;
  font-weight: 700;
  color: #569cd6;
}
.pvalue-interpretation {
  font-size: 0.85rem;
  font-weight: 600;
  width: 100%;
  padding-top: 4px;
  border-top: 1px solid var(--border, #e2e8f0);
  color: var(--text, #1e293b);
}
[data-theme="dark"] .pvalue-interpretation { color: #e2e8f0; }

/* 计算器 */
.calc-tabs {
  display: flex;
  border-bottom: 1px solid var(--border, #e2e8f0);
}
.calc-tab {
  flex: 1;
  padding: 8px 12px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.82rem;
  color: var(--text-muted, #64748b);
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}
.calc-tab:hover { color: var(--text, #1e293b); background: rgba(0,0,0,0.03); }
.calc-tab.active {
  color: #569cd6;
  border-bottom-color: #569cd6;
  font-weight: 600;
}
.calc-body { padding: 14px 16px 0; }
.calc-panel { display: none; }
.calc-panel.active { display: block; }
.calc-field {
  margin-bottom: 12px;
}
.calc-field label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted, #64748b);
  margin-bottom: 4px;
}
.calc-input {
  width: 100%;
  box-sizing: border-box;
  padding: 8px 10px;
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  background: var(--bg, #fff);
  color: var(--text, #1e293b);
  resize: vertical;
}
.calc-input:focus { outline: none; border-color: #569cd6; box-shadow: 0 0 0 2px rgba(86,156,214,0.2); }
.calc-check { margin-right: 6px; accent-color: #569cd6; }
.calc-run {
  display: block;
  width: calc(100% - 32px);
  margin: 0 16px 12px;
  padding: 9px;
  background: #569cd6;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
.calc-run:hover { background: #3b82f6; }

/* 计算结果 */
.calc-result { padding: 0 16px 14px; }
.result-table {
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 6px;
  overflow: hidden;
  font-size: 0.82rem;
}
.result-row {
  display: flex;
  padding: 6px 10px;
  border-bottom: 1px solid var(--border, #e2e8f0);
}
.result-row:last-child { border-bottom: none; }
.result-row.header {
  background: var(--nav-bg, #f1f5f9);
  font-weight: 600;
  color: var(--text, #1e293b);
}
[data-theme="dark"] .result-row.header { background: #111827; }
.result-row span:first-child { flex: 0 0 130px; color: var(--text-muted, #64748b); }
.result-row span:last-child { flex: 1; font-family: 'JetBrains Mono', monospace; color: var(--text, #1e293b); }
[data-theme="dark"] .result-row span:last-child { color: #e2e8f0; }
.result-sig { color: #ef4444; font-weight: 700; }
.result-ns { color: var(--text-muted, #64748b); }
.calc-note {
  margin-top: 8px;
  padding: 8px 10px;
  background: #fffbeb;
  border: 1px solid #f59e0b;
  border-radius: 4px;
  font-size: 0.78rem;
  color: #92400e;
}
[data-theme="dark"] .calc-note { background: #292524; border-color: #78716c; color: #fde68a; }
.callout > *:not(.callout-header) { padding: 12px 14px; }

/* ANOVA table */
.viz-table {
  padding: 12px 16px;
  overflow-x: auto;
}
.anova-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  margin-top: 8px;
}
.anova-table th, .anova-table td {
  padding: 6px 12px;
  text-align: center;
  border: 1px solid var(--border, #e2e8f0);
}
.anova-table th {
  background: var(--nav-bg, #f1f5f9);
  font-weight: 600;
  color: var(--text, #1e293b);
}
.anova-table td { font-family: 'JetBrains Mono', monospace; }
.anova-table td.sig { color: #ef4444; font-weight: 700; }
.anova-table td.ns { color: var(--text-muted, #64748b); }

/* 图表副标题 */
.viz-subtitle {
  padding: 6px 16px 12px;
  font-size: 0.82rem;
  color: var(--text-muted, #64748b);
  text-align: center;
}