/* ===== MossDocuments Documentation Site - Design System v3 ===== */
/* Color: Indigo | Style: Modern Docs */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

/* ===== CSS Variables - Light Theme ===== */
:root {
  /* Primary - Indigo */
  --color-primary: #4f46e5;
  --color-primary-light: #6366f1;
  --color-primary-lighter: #c7d2fe;
  --color-primary-bg: #eef2ff;
  --color-primary-dark: #3730a3;

  --color-accent: #4f46e5;
  --color-accent-bg: rgba(79, 70, 229, 0.08);

  /* Text */
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;

  /* Background */
  --color-bg: #ffffff;
  --color-bg-subtle: #f8fafc;
  --color-bg-muted: #f1f5f9;
  --color-bg-hover: #e2e8f0;

  /* Border */
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;

  /* Sidebar */
  --color-sidebar-bg: #f8fafc;
  --color-sidebar-border: #e2e8f0;
  --color-sidebar-hover: rgba(79, 70, 229, 0.06);
  --color-sidebar-active: rgba(79, 70, 229, 0.10);

  /* Code */
  --color-code-bg: #f1f5f9;
  --color-code-text: #7c3aed;
  --color-code-block-bg: #1e1b2e;
  --color-code-block-text: #e2e8f0;

  /* Callout */
  --color-callout-info: #3b82f6;
  --color-callout-warning: #f59e0b;
  --color-callout-success: #10b981;
  --color-callout-danger: #ef4444;
  --color-callout-tip: #4f46e5;

  /* Layout */
  --sidebar-width: 288px;
  --toc-width: 224px;
  --header-height: 64px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: 'JetBrains Mono', "Fira Code", "SF Mono", Consolas, monospace;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.06);
  --shadow-header: 0 1px 3px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-theme: 300ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-xl: 14px;

  /* Selection */
  --color-selection: rgba(79, 70, 229, 0.18);
}

/* ===== Gold Theme ===== */
.gold {
  --color-primary: #d4a855;
  --color-primary-light: #e8c67a;
  --color-primary-lighter: #3d2e14;
  --color-primary-bg: #2a1f0d;
  --color-primary-dark: #f0d48a;

  --color-accent: #d4a855;
  --color-accent-bg: rgba(212, 168, 85, 0.10);

  --color-text: #f0e8d8;
  --color-text-secondary: #b8a68c;
  --color-text-muted: #7a6b55;

  --color-bg: #0a0a0a;
  --color-bg-subtle: #141210;
  --color-bg-muted: #1e1c18;
  --color-bg-hover: #2a2722;

  --color-border: #2a2722;
  --color-border-light: #1e1c18;

  --color-sidebar-bg: #0e0c0a;
  --color-sidebar-border: #2a2722;
  --color-sidebar-hover: rgba(212, 168, 85, 0.06);
  --color-sidebar-active: rgba(212, 168, 85, 0.12);

  --color-code-bg: #1e1c18;
  --color-code-text: #e8c67a;
  --color-code-block-bg: #141210;
  --color-code-block-text: #c8b8a0;

  --color-selection: rgba(212, 168, 85, 0.25);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.15);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -2px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.25), 0 4px 6px -4px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.35), 0 8px 10px -6px rgba(0, 0, 0, 0.25);
  --shadow-header: 0 1px 3px rgba(0, 0, 0, 0.15);
}

/* ===== Dark Theme ===== */
.dark {
  --color-primary: #818cf8;
  --color-primary-light: #a5b4fc;
  --color-primary-lighter: #312e81;
  --color-primary-bg: #1e1b4b;
  --color-primary-dark: #a5b4fc;

  --color-accent: #818cf8;
  --color-accent-bg: rgba(129, 140, 248, 0.10);

  --color-text: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;

  --color-bg: #0c0a1d;
  --color-bg-subtle: #130f2e;
  --color-bg-muted: #1e1b3a;
  --color-bg-hover: #2d2a4a;

  --color-border: #2d2a4a;
  --color-border-light: #1e1b3a;

  --color-sidebar-bg: #0f0d24;
  --color-sidebar-border: #2d2a4a;
  --color-sidebar-hover: rgba(129, 140, 248, 0.06);
  --color-sidebar-active: rgba(129, 140, 248, 0.12);

  --color-code-bg: #1e1b3a;
  --color-code-text: #a78bfa;
  --color-code-block-bg: #130f2e;
  --color-code-block-text: #cbd5e1;

  --color-selection: rgba(129, 140, 248, 0.25);
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-theme), color var(--transition-theme);
}

::selection { background: var(--color-selection); }

/* ===== Custom Scrollbar ===== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: var(--color-text-muted); }
* { scrollbar-width: thin; scrollbar-color: var(--color-border) transparent; }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-header);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

.dark .site-header {
  background: rgba(12, 10, 29, 0.85);
}

.gold .site-header {
  background: rgba(10, 10, 10, 0.85);
}

.site-header h1 {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.site-header h1 a {
  text-decoration: none;
  color: var(--color-text);
  transition: color var(--transition-fast);
}

/* Version badge */
.version-badge {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-accent-bg);
  padding: 0.15rem 0.45rem;
  border-radius: 9999px;
  margin-left: 0.4rem;
  vertical-align: middle;
  letter-spacing: 0.02em;
  transition: all var(--transition-fast);
}

.site-header nav {
  margin-left: 2rem;
  display: flex;
  gap: 0.25rem;
}

.site-header nav a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.site-header nav a:hover {
  color: var(--color-primary);
  background: var(--color-accent-bg);
}

.site-header nav a.active {
  color: var(--color-primary);
  background: var(--color-sidebar-active);
  font-weight: 600;
}

/* Header right section */
.header-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Search trigger button */
.search-trigger {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-width: 200px;
  font-family: var(--font-sans);
}

.search-trigger:hover {
  border-color: var(--color-primary);
  color: var(--color-text-secondary);
}

.search-trigger kbd {
  margin-left: auto;
  padding: 0.1rem 0.4rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-bg-muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* Theme toggle button */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--color-bg-hover);
  color: var(--color-primary);
}

.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: none; }
.theme-toggle .icon-star { display: none; }
.dark .theme-toggle .icon-moon { display: block; }
.gold .theme-toggle .icon-star { display: block; }

/* ===== Search Modal ===== */
.search-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 12vh;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.search-overlay.open { opacity: 1; pointer-events: auto; }

.search-modal {
  width: 90%;
  max-width: 580px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  transform: scale(0.96) translateY(-8px);
  transition: transform var(--transition-fast);
}

.search-overlay.open .search-modal { transform: scale(1) translateY(0); }

.search-input-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

.search-input-wrapper svg { width: 20px; height: 20px; color: var(--color-text-muted); flex-shrink: 0; }

.search-input-wrapper input {
  flex: 1;
  border: none;
  background: none;
  color: var(--color-text);
  font-size: 1rem;
  font-family: var(--font-sans);
  outline: none;
}

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

.search-results {
  max-height: 380px;
  overflow-y: auto;
  padding: 0.5rem;
}

.search-results .search-result-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.75rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  line-height: 1.5;
}

.search-results .search-result-item:hover,
.search-results .search-result-item.selected {
  background: var(--color-accent-bg);
  color: var(--color-primary);
}

.search-result-item .search-result-section {
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  background: var(--color-bg-muted);
  padding: 0.1rem 0.5rem;
  border-radius: 9999px;
  white-space: nowrap;
  flex-shrink: 0;
}

.search-results .search-empty {
  padding: 2.5rem;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.search-results .search-hint {
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--color-border-light);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.search-hint kbd {
  padding: 0.1rem 0.35rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-bg-muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
}

/* ===== Left Sidebar ===== */
.sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  overflow-y: auto;
  padding: 1rem 0.75rem;
  background: var(--color-sidebar-bg);
  border-right: 1px solid var(--color-sidebar-border);
  z-index: 100;
  transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

.sidebar a {
  display: block;
  padding: 0.375rem 0.75rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  line-height: 1.5;
  margin-bottom: 1px;
  transition: all var(--transition-fast);
}

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

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

.sidebar .section-title {
  font-weight: 600;
  color: var(--color-text-muted);
  padding: 1rem 0.75rem 0.375rem;
  margin-top: 0.5rem;
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.sidebar .section-title:first-child {
  margin-top: 0;
  padding-top: 0.5rem;
}

/* ===== Right TOC ===== */
.toc-sidebar {
  position: fixed;
  top: var(--header-height);
  right: 0;
  bottom: 0;
  width: var(--toc-width);
  overflow-y: auto;
  padding: 1.5rem 1rem;
  border-left: 1px solid var(--color-border-light);
  background: var(--color-bg);
  transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

.toc-sidebar .toc-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.75rem;
  padding-left: 0.5rem;
}

.toc-sidebar a {
  display: block;
  padding: 0.25rem 0.5rem;
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.8125rem;
  line-height: 1.6;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: all var(--transition-fast);
}

.toc-sidebar a:hover {
  color: var(--color-primary);
  border-left-color: var(--color-primary-lighter);
}

.toc-sidebar a.active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  font-weight: 500;
}

.toc-sidebar a.toc-h3 {
  padding-left: 1.25rem;
  font-size: 0.75rem;
}

/* ===== Main Content ===== */
.main-content {
  margin-left: var(--sidebar-width);
  margin-right: var(--toc-width);
  margin-top: 0;
  padding: 2.5rem 3rem;
  max-width: none;
  min-height: calc(100vh - var(--header-height));
  transition: background-color var(--transition-theme);
}

.main-content > main,
.main-content > article,
.main-content > .content-wrapper {
  max-width: 896px;
  margin: 0 auto;
}

.main-content > *:first-child { margin-top: 0; }

/* Typography */
.main-content h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--color-text);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
  line-height: 1.3;
}

.main-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-top: 1rem;
  letter-spacing: -0.015em;
  line-height: 1.35;
}

.main-content h3 {
  font-size: 1.175rem;
  font-weight: 600;
  color: var(--color-text);
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.main-content p {
  margin-bottom: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.main-content a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
}
.main-content a:hover {
  color: var(--color-primary-light);
}

.main-content strong { color: var(--color-text); font-weight: 600; }

/* Images */
.main-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  margin: 1.5rem 0;
  box-shadow: var(--shadow-md);
}

/* Code */
.main-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-code-bg);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  color: var(--color-code-text);
  font-weight: 500;
}

.main-content pre {
  background: var(--color-code-block-bg);
  color: var(--color-code-block-text);
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin: 1.25rem 0;
  box-shadow: var(--shadow-md);
  line-height: 1.65;
  border: 1px solid var(--color-border);
}

.dark .main-content pre { border-color: var(--color-border); }

.main-content pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: 0.8125rem;
  font-weight: 400;
}

/* Tables */
.main-content table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.25rem 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.main-content th {
  background: var(--color-bg-muted);
  font-weight: 600;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--color-text-secondary);
  padding: 0.75rem 1rem;
  text-align: left;
}

.main-content td {
  padding: 0.625rem 1rem;
  border-top: 1px solid var(--color-border-light);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.main-content tr:hover td { background: var(--color-bg-subtle); }

/* Alert Blocks */
.main-content .warning,
.main-content .tip,
.main-content .danger,
.main-content .info,
.main-content .custom-block {
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  border-left: 4px solid;
}

.main-content .warning {
  background: rgba(245, 158, 11, 0.08);
  border-left-color: var(--color-callout-warning);
  color: #92400e;
}
.dark .main-content .warning { color: #fcd34d; }

.main-content .tip {
  background: rgba(79, 70, 229, 0.06);
  border-left-color: var(--color-callout-tip);
  color: #3730a3;
}
.dark .main-content .tip { color: #c7d2fe; }

.main-content .danger {
  background: rgba(239, 68, 68, 0.08);
  border-left-color: var(--color-callout-danger);
  color: #991b1b;
}
.dark .main-content .danger { color: #fca5a5; }

.main-content .info {
  background: rgba(59, 130, 246, 0.08);
  border-left-color: var(--color-callout-info);
  color: #1e40af;
}
.dark .main-content .info { color: #93c5fd; }

.main-content .custom-block {
  background: var(--color-bg-muted);
  border-left-color: var(--color-primary);
}

.main-content .custom-block-title { font-weight: 600; margin-bottom: 0.25rem; }

/* Lists */
.main-content ul, .main-content ol { padding-left: 1.5rem; margin-bottom: 1rem; }
.main-content li { margin-bottom: 0.35rem; color: var(--color-text-secondary); }
.main-content li::marker { color: var(--color-primary); }

/* Blockquote */
.main-content blockquote {
  border-left: 4px solid var(--color-primary);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--color-primary-bg);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-text-secondary);
}

/* Horizontal rule */
.main-content hr { border: none; border-top: 1px solid var(--color-border); margin: 2rem 0; }

/* Header anchors */
.header-anchor {
  color: var(--color-text-muted);
  margin-left: 0.3rem;
  font-size: 0.8em;
  opacity: 0;
  transition: opacity var(--transition-fast);
}
.main-content h1:hover .header-anchor,
.main-content h2:hover .header-anchor,
.main-content h3:hover .header-anchor { opacity: 1; }

/* ===== Home Page - Full Redesign ===== */
.home-content {
  margin-left: 0 !important;
  margin-right: 0 !important;
  max-width: 100% !important;
  margin: 0 auto !important;
  padding: 0 !important;
  min-height: calc(100vh - var(--header-height));
}

/* Hero Section */
.home-hero {
  text-align: center;
  padding: 5rem 2rem 3rem;
  position: relative;
  overflow: hidden;
}

/* Decorative gradient background */
.home-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse, var(--color-accent-bg) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.home-hero > * { position: relative; z-index: 1; }

.home-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  background: var(--color-accent-bg);
  color: var(--color-primary);
  padding: 0.35rem 0.875rem;
  border-radius: 9999px;
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  border: 1px solid var(--color-primary-lighter);
}

.home-hero h1 {
  font-size: 3.25rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  border: none;
  padding: 0;
  margin-bottom: 1.25rem;
  line-height: 1.1;
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.dark .home-hero h1 {
  background: linear-gradient(135deg, #e0e7ff 0%, #818cf8 50%, #6366f1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gold .home-hero h1 {
  background: linear-gradient(135deg, #f5e6c8 0%, #d4a855 50%, #b8862d 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.home-hero .home-subtitle {
  font-size: 1.175rem;
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.8;
}

/* Feature highlights under hero */
.home-features {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}

.home-feature-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
}

.home-feature-item svg {
  width: 18px;
  height: 18px;
  color: var(--color-primary);
  flex-shrink: 0;
}

/* Section */
.home-section {
  padding: 3rem 2rem;
  max-width: 1120px;
  margin: 0 auto;
}

.home-section-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.home-section-heading {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.home-section-desc {
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  max-width: 540px;
}

/* Card Grid */
.home-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.home-card {
  padding: 1.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
  background: var(--color-bg);
  position: relative;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  cursor: pointer;
}

.home-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.home-card .card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-lg);
  background: var(--color-accent-bg);
  margin-bottom: 1rem;
  transition: all var(--transition-normal);
  color: var(--color-primary);
  font-size: 1.125rem;
}

.home-card:hover .card-icon {
  background: var(--color-primary);
  color: white;
  transform: scale(1.08);
}

.home-card h3 {
  margin-bottom: 0.375rem;
  font-size: 1.05rem;
  color: var(--color-text);
  font-weight: 650;
  transition: color var(--transition-fast);
}

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

.home-card .card-desc {
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  line-height: 1.6;
  margin-bottom: 1rem;
  flex: 1;
}

.home-card .card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--color-text-muted);
  font-size: 0.8125rem;
}

.home-card .card-arrow {
  color: var(--color-primary);
  opacity: 0;
  transform: translateX(-4px);
  transition: all var(--transition-fast);
}

.home-card:hover .card-arrow {
  opacity: 1;
  transform: translateX(0);
}

/* Large card variant */
.home-card-large {
  grid-column: span 2;
}

/* Stats row */
.home-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 3rem;
}

.home-stat {
  text-align: center;
  padding: 1.5rem;
  border-radius: var(--radius-xl);
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border-light);
  text-decoration: none;
  transition: all var(--transition-normal);
  cursor: pointer;
  display: block;
}

.home-stat:hover {
  border-color: var(--color-primary);
  background: var(--color-accent-bg);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.home-stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.03em;
  line-height: 1.2;
  transition: color var(--transition-fast);
}

.home-stat:hover .home-stat-number {
  color: var(--color-primary-light);
}

.home-stat-label {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
  transition: color var(--transition-fast);
}

.home-stat:hover .home-stat-label {
  color: var(--color-text-secondary);
}

/* Overview card - non-link card with click handler */
.home-card-overview {
  cursor: pointer;
}

/* ===== Chapter Navigation Panel (Overview) ===== */
.overview-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 9998;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.overview-overlay.open {
  opacity: 1;
  visibility: visible;
}

.overview-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 480px;
  max-width: 90vw;
  height: 100vh;
  background: var(--color-bg);
  z-index: 9999;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.overview-panel.open {
  transform: translateX(0);
}

.overview-header {
  position: sticky;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.overview-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
  border: none;
  padding: 0;
}

.overview-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: none;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.overview-close:hover {
  background: var(--color-bg-hover);
  color: var(--color-text);
}

.overview-grid {
  flex: 1;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.overview-section h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--color-primary);
}

.overview-section h3 a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.overview-section h3 a:hover {
  color: var(--color-primary-light);
}

.overview-chapters {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.overview-chapters a {
  display: block;
  padding: 0.5rem 0.75rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  border-left: 2px solid transparent;
}

.overview-chapters a:hover {
  color: var(--color-primary);
  background: var(--color-accent-bg);
  border-left-color: var(--color-primary);
}

/* Overview panel responsive */
@media (max-width: 768px) {
  .overview-panel {
    width: 100vw;
    max-width: 100vw;
  }
}

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-subtle);
  padding: 3rem 2rem;
  margin-left: var(--sidebar-width);
  transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

.site-footer .footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.site-footer h4 { font-weight: 600; font-size: 0.875rem; margin-bottom: 1rem; color: var(--color-text); }
.site-footer ul { list-style: none; padding: 0; }
.site-footer ul li { margin-bottom: 0.5rem; }
.site-footer ul li a { color: var(--color-text-muted); text-decoration: none; font-size: 0.8125rem; transition: color var(--transition-fast); }
.site-footer ul li a:hover { color: var(--color-text); }
.site-footer .footer-bottom { margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid var(--color-border); display: flex; align-items: center; justify-content: space-between; color: var(--color-text-muted); font-size: 0.8125rem; }

/* ===== Responsive ===== */
@media (max-width: 1100px) {
  .toc-sidebar { display: none; }
  .main-content { margin-right: 0; }
  .search-trigger { min-width: 160px; }
}

@media (max-width: 768px) {
  /* Sidebar becomes overlay */
  .sidebar { 
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    box-shadow: var(--shadow-xl);
    width: 280px;
  }
  .sidebar.open { transform: translateX(0); }

  /* Main content fills width */
  .main-content { 
    margin-left: 0; 
    margin-right: 0;
    padding: 1.25rem 1rem; 
  }

  .toc-sidebar { display: none; }

  /* Header mobile layout */
  .menu-toggle { display: flex !important; }
  .site-header { padding: 0 0.75rem; }
  .site-header h1 { font-size: 0.95rem; }

  .site-header nav { display: none; }

  /* Search trigger compact */
  .search-trigger { 
    min-width: auto; 
    padding: 0.35rem 0.5rem;
    gap: 0.35rem;
  }
  .search-trigger span { display: none; }
  .search-trigger kbd { display: none; }

  /* Typography scaling */
  .main-content h1 { font-size: 1.5rem; }
  .main-content h2 { font-size: 1.25rem; margin-top: 2rem; }
  .main-content h3 { font-size: 1.05rem; }
  .main-content p { font-size: 0.9rem; }

  /* Tables: horizontal scroll */
  .main-content table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  /* Code blocks */
  .main-content pre {
    padding: 1rem;
    font-size: 0.8rem;
    border-radius: var(--radius-md);
  }
  .main-content code {
    font-size: 0.82em;
    word-break: break-word;
  }

  /* Blockquotes */
  .main-content blockquote {
    padding: 0.6rem 1rem;
    margin: 1rem 0;
  }

  /* Alert blocks */
  .main-content .warning,
  .main-content .tip,
  .main-content .danger,
  .main-content .info,
  .main-content .custom-block {
    padding: 0.75rem 1rem;
  }

  /* Home page */
  .home-hero { padding: 3rem 1rem 2rem; }
  .home-hero h1 { font-size: 2rem; }
  .home-hero .home-subtitle { font-size: 0.95rem; }
  .home-section { padding: 2rem 1rem; }
  .home-grid { grid-template-columns: 1fr; }
  .home-card-large { grid-column: span 1; }
  .home-stats { grid-template-columns: repeat(2, 1fr); }
  .home-features { gap: 0.75rem; }
  .home-stat { padding: 1rem; }
  .home-stat-number { font-size: 1.5rem; }
  .home-card { padding: 1.25rem; }

  /* Back to top repositioned */
  .back-to-top { right: 1rem; bottom: 1.5rem; }

  /* Search modal */
  .search-overlay { padding-top: 4vh; }
  .search-modal { width: 95%; border-radius: var(--radius-lg); }
  .search-results { max-height: 55vh; }
}

@media (max-width: 480px) {
  /* Extra small screens */
  .main-content { padding: 1rem 0.75rem; }
  .main-content h1 { font-size: 1.3rem; }
  .main-content h2 { font-size: 1.1rem; }
  .main-content h3 { font-size: 1rem; }
  .main-content p { font-size: 0.875rem; line-height: 1.7; }
  .main-content ul, .main-content ol { padding-left: 1.25rem; }
  .main-content td, .main-content th { padding: 0.5rem 0.625rem; font-size: 0.8rem; }

  /* Header even more compact */
  .site-header h1 { font-size: 0.875rem; }


  /* Home page extra small */
  .home-hero { padding: 2rem 0.75rem 1.5rem; }
  .home-hero h1 { font-size: 1.6rem; }
  .home-hero .home-subtitle { font-size: 0.875rem; }
  .home-badge { font-size: 0.75rem; padding: 0.25rem 0.625rem; }
  .home-section { padding: 1.5rem 0.75rem; }
  .home-stats { grid-template-columns: 1fr 1fr; gap: 0.75rem; }
  .home-stat { padding: 0.75rem; }
  .home-stat-number { font-size: 1.25rem; }
  .home-stat-label { font-size: 0.75rem; }
  .home-features { flex-direction: column; align-items: center; gap: 0.5rem; }
  .home-card { padding: 1rem; }

  /* Sidebar full width on very small screens */
  .sidebar { width: 260px; }
}

/* Menu toggle button (mobile) */
.menu-toggle {
  display: none !important;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  margin-right: 0.5rem;
  transition: all var(--transition-fast);
}

.menu-toggle:hover { background: var(--color-bg-hover); }

/* ===== Back to Top Button ===== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: calc(var(--toc-width) + 1.5rem);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(10px);
  transition: all var(--transition-normal);
  z-index: 50;
  color: var(--color-text-secondary);
}

.back-to-top.visible { opacity: 1; transform: translateY(0); }
.back-to-top:hover { background: var(--color-primary-bg); border-color: var(--color-primary); color: var(--color-primary); }
.back-to-top svg { width: 16px; height: 16px; stroke: currentColor; }

/* ===== VitePress Content Styles ===== */
/* Styles for content originally from VitePress */

/* Syntax-highlighted code blocks */
.vp-adaptive-theme {
  position: relative;
}

.vp-code {
  font-family: var(--font-mono) !important;
  font-size: 0.8125rem !important;
  line-height: 1.65;
  tab-size: 2;
}

.vp-adaptive-theme .copy {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-bg-muted);
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition-fast);
  font-size: 0;
}

.vp-adaptive-theme:hover .copy { opacity: 1; }

.vp-adaptive-theme .lang {
  position: absolute;
  top: 0.5rem;
  right: 2.5rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  pointer-events: none;
  opacity: 0.6;
}

/* Audience grid (from Basic section pages) */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.audience-card {
  padding: 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg-subtle);
  transition: all var(--transition-fast);
}

.audience-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.audience-title {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.audience-desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* Outcome grid */
.outcome-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.outcome-card {
  padding: 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg-subtle);
}

.outcome-title {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-text);
  margin-bottom: 0.375rem;
}

.outcome-desc {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Details/summary elements (from VitePress interactive demos) */
.main-content details {
  margin: 1rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg-subtle);
  overflow: hidden;
}

.main-content summary {
  padding: 0.75rem 1rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--color-text);
  background: var(--color-bg-muted);
  transition: background var(--transition-fast);
}

.main-content summary:hover {
  background: var(--color-bg-hover);
}

.main-content details > *:not(summary) {
  padding: 0 1rem;
}

/* ===== Mobile Sidebar Overlay ===== */
.sidebar-overlay {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(2px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.sidebar-overlay.open { opacity: 1; pointer-events: auto; }