/* Navigation */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  min-height: var(--nav-height);
  height: auto;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 24px;
  background: color-mix(in srgb, var(--bg-elevated) 88%, transparent);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  margin-right: 8px;
  flex-shrink: 0;
}

.navbar-brand img { height: 28px; width: auto; }

.navbar-links {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  list-style: none;
  flex: 1 1 auto;
  min-width: 0;
  overflow: visible;
  align-content: center;
}

.navbar-links a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.navbar-links a:hover {
  background: var(--primary-soft);
  color: var(--primary);
}

.navbar-links a.active {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 600;
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  margin-left: auto;
}

/* Doc layout */
.doc-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  height: calc(100vh - var(--nav-height));
  overflow: hidden;
}

.doc-sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  padding: 20px 0;
  overflow-y: auto;
  position: sticky;
  top: var(--nav-height);
  height: calc(100vh - var(--nav-height));
}

.doc-sidebar-header {
  padding: 0 20px 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}

.doc-sidebar-header h2 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
}

.doc-sidebar-header .lang-badge {
  margin-top: 6px;
}

.doc-sidebar-header--compact .lang-badge {
  margin-top: 0;
}

.doc-nav { list-style: none; }

.doc-nav--grouped {
  padding: 4px 16px 16px;
}

.doc-nav--grouped .doc-nav-top-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
}

.doc-nav--grouped .doc-nav-top-list li {
  margin-bottom: 4px;
}

.doc-nav--grouped .doc-nav-top-list li a {
  display: block;
  padding: 8px 12px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border-left: none;
  transition: all 0.15s ease;
  text-decoration: none;
}

.doc-nav--grouped .doc-nav-top-list li a:hover,
.doc-nav--grouped .doc-nav-top-list li a.active {
  background: var(--primary-soft);
  color: var(--primary);
}

/* 分组侧栏 — 对齐动画演示 .algo-sidebar */
.doc-nav--grouped .doc-nav-group-title {
  font-size: 0.95rem;
  font-weight: 600;
  padding: 6px 8px;
  margin-bottom: 10px;
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text);
  font-family: inherit;
  letter-spacing: normal;
  text-transform: none;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.doc-nav--grouped .doc-nav-group-title::before {
  content: '▾';
  font-size: 0.6rem;
  transition: transform 0.2s;
}

.doc-nav--grouped .doc-nav-group-title.collapsed::before {
  transform: rotate(-90deg);
}

.doc-nav--grouped .doc-nav-group-list {
  list-style: none;
  overflow: hidden;
  transition: max-height 0.3s ease;
  max-height: 2000px;
  margin: 0 0 20px;
  padding: 0;
}

.doc-nav--grouped .doc-nav-group-list.collapsed {
  max-height: 0;
  margin-bottom: 0;
}

.doc-nav--grouped .doc-nav-group-list li {
  margin-bottom: 4px;
}

.doc-nav--grouped .doc-nav-group-list li a {
  display: block;
  padding: 8px 12px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border-left: none;
  transition: all 0.15s ease;
  text-decoration: none;
}

.doc-nav--grouped .doc-nav-group-list li a:hover,
.doc-nav--grouped .doc-nav-group-list li a.active {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 500;
}

.doc-nav--grouped .doc-nav-group-list li.placeholder a {
  color: var(--text-muted);
  font-style: italic;
}

.doc-nav--grouped .doc-nav-add {
  padding: 0 8px;
}

.doc-nav li a {
  display: block;
  padding: 9px 20px;
  color: var(--text-secondary);
  font-size: 0.875rem;
  border-left: 3px solid transparent;
  transition: all 0.15s ease;
}

.doc-nav li a:hover {
  color: var(--text);
  background: var(--primary-soft);
}

.doc-nav li a.active {
  color: var(--primary);
  background: var(--primary-soft);
  border-left-color: var(--primary);
  font-weight: 600;
}

.doc-nav li.placeholder a {
  color: var(--text-muted);
  font-style: italic;
}

.doc-main {
  padding: 32px 40px 64px;
  overflow-y: auto;
  height: calc(100vh - var(--nav-height));
}

.doc-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.doc-toolbar h1 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.3;
}

/* Demo layout */
.demo-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: calc(100vh - var(--nav-height));
}

.demo-sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  padding: 20px 0;
}

.demo-sidebar h3 {
  padding: 8px 20px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  font-weight: 600;
}

.demo-list { list-style: none; margin-bottom: 16px; }

.demo-list a {
  display: block;
  padding: 8px 20px;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.demo-list a:hover, .demo-list a.active {
  color: var(--primary);
  background: var(--primary-soft);
}

.demo-stage {
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.demo-canvas {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  min-height: 320px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 8px;
  box-shadow: var(--shadow-sm);
}

.demo-bar {
  width: 36px;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  background: var(--primary);
  opacity: 0.85;
  transition: height 0.4s ease, background 0.3s ease;
}

.demo-bar.highlight { background: var(--accent); opacity: 1; }

.demo-controls {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

@media (max-width: 900px) {
  .doc-layout, .demo-layout { grid-template-columns: 1fr; }
  .doc-sidebar, .demo-sidebar {
    position: static;
    height: auto;
    max-height: 240px;
  }
  .doc-main { padding: 24px 20px 48px; }
  .navbar { padding: 0 16px; }
}