/* ===== AI Testing Knowledge Base - Global Styles ===== */
:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --surface-glass: rgba(255,255,255,0.72);
  --sidebar-bg: rgba(255,255,255,0.88);
  --primary: #4f46e5;
  --primary-light: #818cf8;
  --primary-dark: #3730a3;
  --accent: #0ea5e9;
  --accent-green: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --text: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --border: rgba(0,0,0,0.08);
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.08);
  --radius: 12px;
  --radius-sm: 8px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "JetBrains Mono", monospace;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* Subtle gradient overlay for depth (matching blog style, very muted) */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 70% 50% at 15% 25%, rgba(124,58,237,0.06) 0%, transparent 60%),
    radial-gradient(ellipse 50% 60% at 80% 55%, rgba(99,102,241,0.05) 0%, transparent 55%);
  pointer-events: none;
}

/* ===== Layout ===== */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* ===== Sidebar ===== */
.sidebar {
  width: 280px;
  background: var(--sidebar-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-right: 1px solid var(--border);
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  overflow-y: auto;
  z-index: 100;
  padding: 0;
  display: flex;
  flex-direction: column;
  scrollbar-width: thin;
}

.sidebar-header {
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
}

.sidebar-header h1 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.sidebar-header p {
  font-size: 12px;
  opacity: 0.8;
  margin-top: 4px;
}

.sidebar-nav {
  flex: 1;
  padding: 12px 0;
  overflow-y: auto;
}

.nav-section {
  margin-bottom: 4px;
}

.nav-section-title {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  cursor: pointer;
  user-select: none;
  transition: color 0.2s;
}

.nav-section-title:hover { color: var(--text); }
.nav-section-title .arrow {
  font-size: 10px;
  transition: transform 0.2s;
}
.nav-section-title .arrow.open { transform: rotate(90deg); }

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

.nav-items li a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 20px 7px 36px;
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.15s;
  border-left: 3px solid transparent;
}

.nav-items li a:hover {
  background: rgba(79,70,229,0.05);
  color: var(--primary);
}

.nav-items li a.active {
  background: rgba(79,70,229,0.08);
  color: var(--primary);
  border-left-color: var(--primary);
  font-weight: 500;
}

.nav-items li a .dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-muted);
  flex-shrink: 0;
}

.nav-items li a:hover .dot,
.nav-items li a.active .dot { background: var(--primary); }

/* ===== Main Content ===== */
.main-content {
  flex: 1;
  margin-left: 0;
  padding: 0;
  min-height: 100vh;
}

.content-header {
  background: var(--surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 24px 40px;
  position: sticky;
  top: 0;
  z-index: 50;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
}

.breadcrumb a:hover { color: var(--primary); }

.content-header h1 {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text);
}

.content-body {
  padding: 32px 40px 60px;
  max-width: 960px;
  flex: 1;
  min-width: 0;
}

/* ===== Typography ===== */
.content-body h2 {
  font-size: 24px;
  font-weight: 700;
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--primary);
  color: var(--text);
}

.content-body h3 {
  font-size: 18px;
  font-weight: 600;
  margin-top: 28px;
  margin-bottom: 12px;
  color: var(--text);
}

.content-body h4 {
  font-size: 16px;
  font-weight: 600;
  margin-top: 20px;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.content-body p {
  font-size: 15px;
  margin-bottom: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.content-body ul, .content-body ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.content-body li {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  line-height: 1.7;
}

.content-body a {
  color: var(--primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.content-body a:hover { border-bottom-color: var(--primary); }

/* ===== Cards ===== */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 20px;
  border: 1px solid var(--border);
  transition: box-shadow 0.2s;
}

.card:hover { box-shadow: var(--shadow-lg); }

.card h3 {
  margin-top: 0;
}

/* ===== Info Boxes ===== */
.info-box {
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  margin-bottom: 20px;
  font-size: 14px;
  line-height: 1.7;
}

.info-box.tip { background: #ecfdf5; border-left: 4px solid var(--accent-green); color: #065f46; }
.info-box.note { background: #eff6ff; border-left: 4px solid var(--primary); color: #1e40af; }
.info-box.warning { background: #fffbeb; border-left: 4px solid var(--accent-amber); color: #92400e; }
.info-box.caution { background: #fff1f2; border-left: 4px solid var(--accent-rose); color: #9f1239; }

.info-box strong { display: block; margin-bottom: 4px; font-size: 13px; text-transform: uppercase; letter-spacing: 0.5px; }

/* ===== Table ===== */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
  font-size: 14px;
}

th, td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  background: #f8fafc;
  font-weight: 600;
  color: var(--text);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

tr:hover td { background: #fafbfc; }

/* ===== Code ===== */
code {
  font-family: var(--font-mono);
  background: #f1f5f9;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
  color: #e11d48;
}

pre {
  background: #1e293b;
  color: #e2e8f0;
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  overflow-x: auto;
  margin-bottom: 20px;
  font-size: 13px;
  line-height: 1.7;
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

/* ===== Knowledge Graph ===== */
.kg-container {
  display: grid;
  gap: 16px;
  margin-bottom: 32px;
}

.kg-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  border: 1px solid var(--border);
  transition: all 0.25s;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.kg-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.kg-card.accent-1 { border-top: 4px solid var(--primary); }
.kg-card.accent-2 { border-top: 4px solid var(--accent); }
.kg-card.accent-3 { border-top: 4px solid var(--accent-green); }
.kg-card.accent-4 { border-top: 4px solid var(--accent-amber); }
.kg-card.accent-5 { border-top: 4px solid var(--accent-rose); }
.kg-card.accent-6 { border-top: 4px solid #8b5cf6; }
.kg-card.accent-7 { border-top: 4px solid #14b8a6; }
.kg-card.accent-8 { border-top: 4px solid #f97316; }
.kg-card.accent-9 { border-top: 4px solid #6366f1; }
.kg-card.accent-10 { border-top: 4px solid #ec4899; }

.kg-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.kg-card p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 12px;
  line-height: 1.6;
}

.kg-card .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.kg-card .tag {
  background: rgba(79,70,229,0.08);
  color: var(--primary);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 500;
}

.kg-card a {
  text-decoration: none;
  color: inherit;
}

.kg-card a:hover h3 { color: var(--primary); }

/* ===== Sub-sections ===== */
.subsection-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin: 20px 0;
}

.subsection-card {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 20px;
  border: 1px solid var(--border);
  transition: all 0.2s;
  text-decoration: none;
  display: block;
}

.subsection-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
  border-color: var(--primary-light);
}

.subsection-card h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.subsection-card p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0;
}

/* ===== Tags ===== */
.tag-badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 500;
  margin-right: 4px;
}

.tag-badge.blue { background: #dbeafe; color: #1d4ed8; }
.tag-badge.green { background: #d1fae5; color: #065f46; }
.tag-badge.amber { background: #fef3c7; color: #92400e; }
.tag-badge.purple { background: #ede9fe; color: #6d28d9; }
.tag-badge.rose { background: #ffe4e6; color: #be123c; }
.tag-badge.cyan { background: #cffafe; color: #0e7490; }

/* ===== Stats Counter ===== */
.stat-row {
  display: flex;
  gap: 24px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
  background: var(--surface);
  padding: 16px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  flex: 1;
  min-width: 100px;
}

.stat-item .num {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary);
  display: block;
}

.stat-item .label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ===== Footer ===== */

/* ===== Top Navigation Bar ===== */
.top-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0 16px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  flex-wrap: wrap;
}

.top-nav a {
  color: var(--primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 6px;
  transition: all 0.15s;
  font-weight: 500;
}

.top-nav a:hover {
  background: rgba(79,70,229,0.08);
  color: var(--primary-dark);
}

.top-nav .nav-sep {
  color: var(--text-muted);
  font-size: 12px;
}

.top-nav .nav-spacer {
  flex: 1;
}

.content-footer {
  margin-top: 48px;
  padding: 20px 0;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-muted);
}

/* ===== Mobile Menu Button ===== */
.mobile-menu-btn {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--primary);
  color: white;
  border: none;
  font-size: 20px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
}

.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.3);
  z-index: 149;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .mobile-menu-btn { display: flex; }
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 150;
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay.open { display: block; }
  .main-content { margin-left: 0; }
  .content-header { padding: 16px 20px; }
  .content-body { padding: 20px; }
  .content-header h1 { font-size: 22px; }
  .subsection-grid { grid-template-columns: 1fr; }
  .stat-row { flex-direction: column; gap: 12px; }
}

/* Desktop: sidebar as fixed column */
@media (min-width: 769px) {
  .sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    flex-shrink: 0;
  }
  .main-content { margin-left: 280px; }
  .sidebar-overlay { display: none !important; }
}

/* ===== Search ===== */
.search-section {
  margin-bottom: 24px;
  position: relative;
}

.search-box {
  display: flex;
  gap: 8px;
  max-width: 520px;
}

#search-input {
  flex: 1;
  padding: 10px 16px;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  font-family: var(--font);
}

#search-input:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}

#search-input::placeholder {
  color: var(--text-muted);
}

.search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  max-width: 520px;
  margin-top: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  max-height: 320px;
  overflow-y: auto;
  z-index: 200;
}

.search-result-item {
  display: block;
  padding: 10px 16px;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 13px;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s;
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover {
  background: rgba(79,70,229,0.05);
  color: var(--primary);
}

.search-result-item .result-title {
  font-weight: 500;
  color: var(--text);
}

.search-result-item .result-section {
  font-size: 11px;
  color: var(--text-muted);
  margin-left: 6px;
}

.search-no-results {
  padding: 16px;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

.search-highlight {
  background: #fef08a;
  padding: 0 2px;
  border-radius: 2px;
}

/* ===== SVG Knowledge Graph ===== */
.kg-svg-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 24px;
  overflow-x: auto;
}

.kg-svg {
  width: 100%;
  height: auto;
  max-height: 580px;
}

.kg-node {
  cursor: pointer;
  transition: opacity 0.2s, filter 0.2s;
}

.kg-node:hover {
  opacity: 1 !important;
  filter: brightness(1.15);
}

/* ===== Progress Bar ===== */
.progress-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 32px;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.progress-percent {
  font-size: 20px;
  font-weight: 800;
  color: var(--accent-green);
}

.progress-bar {
  height: 8px;
  background: #e2e8f0;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 16px;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent-green));
  border-radius: 4px;
  transition: width 0.6s ease;
}

.progress-steps {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
}

.progress-step {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

.progress-step.completed {
  color: var(--accent-green);
  font-weight: 500;
}

.progress-step.completed::after {
  content: '✅';
  font-size: 10px;
  margin-left: 2px;
}

/* ===== Recent Updates ===== */
.recent-updates {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 32px;
}

.update-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: all 0.2s;
}

.update-item:hover {
  box-shadow: var(--shadow);
  border-color: var(--primary-light);
}

.update-date {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  min-width: 44px;
}

.update-title {
  flex: 1;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
}

.update-tag {
  flex-shrink: 0;
}

/* ===== Category Browse ===== */
.category-browse {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.category-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
}

.category-group h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
  margin-top: 0;
}

.category-group ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.category-group li {
  margin-bottom: 4px;
}

.category-group li a {
  display: block;
  padding: 4px 0;
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s;
}

.category-group li a:hover {
  color: var(--primary);
}

/* ===== Print ===== */
@media print {
  .sidebar { display: none; }
  .main-content { margin-left: 0; }
  .content-header { position: static; backdrop-filter: none; }
  .content-body { max-width: none; padding: 20px; }
  .kg-svg-container { display: none; }
  .search-section { display: none; }
  .category-browse { display: none; }
  .recent-updates { display: none; }
  .progress-section { display: none; }
  pre { break-inside: avoid; }
  table { break-inside: avoid; }
  img { break-inside: avoid; }
  h2, h3 { break-after: avoid; }
  .mobile-menu-btn { display: none !important; }
  .sidebar-overlay { display: none !important; }
}

/* ===== Dark Mode ===== */
[data-theme="dark"] {
  --bg: #0f0f1a;
  --surface: rgba(20,20,35,0.88);
  --sidebar-bg: rgba(15,15,26,0.95);
  --text: #e8edf5;
  --text-secondary: #b0b8c8;
  --text-muted: #7888a0;
  --border: rgba(255,255,255,0.07);
  --shadow: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.4);
}

[data-theme="dark"] th {
  background: rgba(255,255,255,0.04);
  color: var(--text);
}

[data-theme="dark"] .sidebar-header {
  background: linear-gradient(135deg, #312e81 0%, #1e1b4b 100%);
}

[data-theme="dark"] code {
  background: #334155;
  color: #f9a8d4;
}

[data-theme="dark"] .info-box.tip { background: #064e3b; border-left-color: #34d399; color: #d1fae5; }
[data-theme="dark"] .info-box.note { background: #1e3a5f; border-left-color: #818cf8; color: #dbeafe; }
[data-theme="dark"] .info-box.warning { background: #78350f; border-left-color: #fbbf24; color: #fef3c7; }
[data-theme="dark"] .info-box.caution { background: #881337; border-left-color: #fb7185; color: #ffe4e6; }

[data-theme="dark"] tr:hover td {
  background: rgba(255,255,255,0.03);
}

[data-theme="dark"] .progress-bar {
  background: #334155;
}

[data-theme="dark"] .search-highlight {
  background: #854d0e;
  color: #fef08a;
}

[data-theme="dark"] .tag-badge.blue { background: #1e3a5f; color: #93c5fd; }
[data-theme="dark"] .tag-badge.green { background: #064e3b; color: #6ee7b7; }
[data-theme="dark"] .tag-badge.amber { background: #78350f; color: #fcd34d; }
[data-theme="dark"] .tag-badge.purple { background: #4c1d95; color: #c4b5fd; }
[data-theme="dark"] .tag-badge.rose { background: #881337; color: #fda4af; }
[data-theme="dark"] .tag-badge.cyan { background: #164e63; color: #67e8f9; }

/* ===== Theme Toggle Button ===== */
.theme-toggle {
  background: none;
  border: 1px solid rgba(255,255,255,0.3);
  color: white;
  font-size: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.5);
}

.sidebar-header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

/* ===== Cross-linking (Related Links) ===== */
.related-links {
  margin-top: 32px;
  padding: 20px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.related-links h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin-top: 0;
  margin-bottom: 12px;
}

.related-links-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.related-link-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: rgba(79,70,229,0.06);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  transition: all 0.2s;
}

.related-link-item:hover {
  background: rgba(79,70,229,0.12);
  color: var(--primary);
  border-color: var(--primary-light);
  box-shadow: var(--shadow);
}

.related-link-item .link-section {
  font-size: 11px;
  color: var(--text-muted);
}

/* ===== Dark Mode (synced with blog theme) ===== */
body.kb-dark {
  --bg: #080a18;
  --surface: #0d112a;
  --surface-glass: rgba(13,17,42,0.72);
  --sidebar-bg: rgba(8,10,24,0.92);
  --primary: #9b8cff;
  --primary-light: #b7adff;
  --primary-dark: #7c3aed;
  --accent: #22d3ee;
  --accent-green: #2dd4bf;
  --accent-amber: #fbbf24;
  --accent-rose: #fb7185;
  --text: #f0f3ff;
  --text-secondary: #c2c8e8;
  --text-muted: #7c85ad;
  --border: rgba(148,163,255,0.13);
  --shadow: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.4);
}
body.kb-dark {
  background: var(--bg) !important;
  color: var(--text) !important;
}
body.kb-dark .sidebar {
  background: var(--sidebar-bg);
  border-right-color: var(--border);
}
body.kb-dark .sidebar h1,
body.kb-dark .sidebar a { color: var(--text); }
body.kb-dark .sidebar a:hover { color: var(--primary); }
body.kb-dark .nav-section-title { color: var(--text-muted); }
body.kb-dark .nav-items a { color: var(--text-secondary); }
body.kb-dark .nav-items a:hover { color: var(--primary); background: rgba(155,140,255,0.08); }
body.kb-dark .nav-items a.active,
body.kb-dark .nav-items .active a { color: var(--primary); background: rgba(155,140,255,0.12); }
body.kb-dark .dot { background: var(--text-muted); }
body.kb-dark .nav-items a.active .dot,
body.kb-dark .nav-items .active .dot { background: var(--primary); }
body.kb-dark .main-content { background: var(--bg); }
body.kb-dark .content-card,
body.kb-dark .content-section { background: var(--surface); border-color: var(--border); }
body.kb-dark .page-title,
body.kb-dark h1, body.kb-dark h2, body.kb-dark h3, body.kb-dark h4 { color: var(--text); }
body.kb-dark p, body.kb-dark li, body.kb-dark td, body.kb-dark th { color: var(--text-secondary); }
body.kb-dark .meta,
body.kb-dark .breadcrumb { color: var(--text-muted); }
body.kb-dark .breadcrumb a { color: var(--primary); }
body.kb-dark code, body.kb-dark pre {
  background: rgba(255,255,255,0.06);
  color: #e2e8f0;
  border-color: var(--border);
}
body.kb-dark table { background: var(--surface); }
body.kb-dark th {
  background: rgba(155,140,255,0.08);
  color: var(--text);
  border-color: var(--border);
}
body.kb-dark td { border-color: var(--border); }
body.kb-dark blockquote {
  border-left-color: var(--primary);
  background: rgba(155,140,255,0.06);
}
body.kb-dark .tag {
  background: rgba(155,140,255,0.1);
  color: var(--primary);
}
body.kb-dark .hero { background: linear-gradient(135deg, #0f112a, #1a1f4e); }
body.kb-dark .hero h1 { color: var(--text); }
body.kb-dark .hero p { color: var(--text-muted); }
body.kb-dark .hero .num { color: var(--primary); }
body.kb-dark .card { background: var(--surface); border-color: var(--border); }
body.kb-dark .card h3 { color: var(--primary); }
body.kb-dark .card p { color: var(--text-secondary); }
body.kb-dark .card .pages { color: var(--text-muted); }
body.kb-dark .kb-container { background: var(--bg); }
body.kb-dark .grid-item { background: var(--surface); }
body.kb-dark .content-area { color: var(--text-secondary); }
body.kb-dark .sidebar-nav a.active,
body.kb-dark .nav-section .active a { color: var(--primary); }