:root {
  --bg-primary: #ffffff;
  --bg-secondary: #faf5ff;
  --bg-tertiary: #f3e8ff;
  --bg-code: #f5f3ff;
  --bg-sidebar: rgba(250, 245, 255, 0.75);
  --bg-hero: linear-gradient(135deg, #1e1b4b 0%, #4c1d95 50%, #7c3aed 100%);
  --text-primary: #1e1b4b;
  --text-secondary: #4a4458;
  --text-tertiary: #7c6a9a;
  --text-code: #7c3aed;
  --accent: #7c3aed;
  --accent-hover: #6d28d9;
  --accent-light: rgba(124, 58, 237, 0.1);
  --accent-glow: rgba(124, 58, 237, 0.3);
  --border: #d8d0e8;
  --border-light: #e8e0f0;
  --border-thick: #1e1b4b;
  --shadow-sm: 0 4px 6px rgba(30,27,75,0.15);
  --shadow-md: 0 6px 16px rgba(30,27,75,0.2);
  --shadow-lg: 0 10px 40px rgba(30,27,75,0.25);
  --link: #6d28d9;
  --link-hover: #a855f7;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #6366f1;
  --sidebar-width: 280px;
  --sidebar-collapsed-width: 48px;
  --header-height: 64px;
  --toc-width: 220px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', 'Consolas', 'Monaco', monospace;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --transition: 0.2s cubic-bezier(.4,0,.2,1);
}

[data-theme="dark"] {
  --bg-primary: #0f0a1a;
  --bg-secondary: #1a1228;
  --bg-tertiary: #25193a;
  --bg-code: #1a1228;
  --bg-sidebar: rgba(15, 10, 26, 0.85);
  --text-primary: #e8dff5;
  --text-secondary: #b09fc8;
  --text-tertiary: #8b7aa3;
  --text-code: #c084fc;
  --accent: #a855f7;
  --accent-hover: #c084fc;
  --accent-light: rgba(168, 85, 247, 0.15);
  --accent-glow: rgba(168, 85, 247, 0.25);
  --border: #2d2040;
  --border-light: #1f1530;
  --border-thick: #e8dff5;
  --shadow-sm: 0 4px 6px rgba(0,0,0,0.5);
  --shadow-md: 0 6px 16px rgba(0,0,0,0.6);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.7);
  --link: #a855f7;
  --link-hover: #c084fc;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg-primary);
  line-height: 1.7;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(124,58,237,0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(124,58,237,0.02) 0%, transparent 50%);
}

a { color: var(--link); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--link-hover); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }

img { max-width: 100%; height: auto; }

::selection { background: var(--accent); color: #fff; }

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-100%); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 5px var(--accent-glow); }
  50% { box-shadow: 0 0 20px var(--accent-glow), 0 0 40px var(--accent-glow); }
}

@keyframes shimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes pulseBorder {
  0%, 100% { border-color: var(--border); }
  50% { border-color: var(--accent); }
}

.header {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--header-height);
  background: var(--bg-sidebar);
  border-bottom: 4px solid var(--border-thick);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 1.5rem;
  z-index: 1000;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  animation: slideDown 0.4s ease;
  box-shadow: var(--shadow-md);
}

.header-brand {
  display: flex; align-items: center; gap: 0.75rem;
  font-size: 1.25rem; font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.header-brand .logo {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, #7c3aed, #a855f7);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 900; font-size: 1.125rem;
  border: 2px solid var(--border-thick);
}

.header-search {
  position: relative;
  width: 320px;
}

.header-search input {
  width: 100%;
  padding: 0.5rem 1rem 0.5rem 2.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.header-search input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light), 0 0 15px var(--accent-glow);
}

.header-search .search-icon {
  position: absolute; left: 0.75rem; top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  font-size: 0.875rem;
}

.header-search .search-results {
  display: none;
  position: absolute; top: 100%; left: 0; right: 0;
  background: var(--bg-sidebar);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  max-height: 400px;
  overflow-y: auto;
  margin-top: 4px;
  z-index: 1001;
  animation: scaleIn 0.2s ease;
}

.header-search .search-results.active { display: block; }

.header-search .search-result-item {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-light);
  cursor: pointer;
  transition: background var(--transition);
}

.header-search .search-result-item:hover { background: var(--accent-light); }
.header-search .search-result-item:last-child { border-bottom: none; }

.header-search .search-result-item .result-title {
  font-weight: 600; font-size: var(--font-size-sm);
  color: var(--text-primary);
}

.header-search .search-result-item .result-section {
  font-size: 0.75rem; color: var(--text-tertiary); margin-top: 2px;
}

.header-actions {
  display: flex; align-items: center; gap: 0.75rem;
}

.header-actions button {
  background: var(--bg-sidebar);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 3px solid var(--border);
  color: var(--text-secondary);
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 700;
  transition: all var(--transition);
  display: flex; align-items: center; gap: 0.375rem;
}

.header-actions button:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-1px);
}

.lang-dropdown {
  position: relative;
  display: inline-block;
}

.lang-btn {
  background: var(--bg-sidebar);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 3px solid var(--border);
  color: var(--text-secondary);
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 700;
  transition: all var(--transition);
  display: flex; align-items: center; gap: 0.375rem;
  white-space: nowrap;
}

.lang-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-1px);
}

.lang-menu {
  display: none;
  position: absolute;
  top: 100%; right: 0;
  background: var(--bg-sidebar);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 180px;
  margin-top: 4px;
  z-index: 1001;
  animation: scaleIn 0.2s ease;
  overflow: hidden;
}

.lang-menu.active {
  display: block;
}

.lang-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  color: var(--text-primary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: background var(--transition);
  border-bottom: 1px solid var(--border-light);
}

.lang-option:last-child {
  border-bottom: none;
}

.lang-option:hover {
  background: var(--accent-light);
  color: var(--accent);
}

.lang-option.active {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 600;
}

.mobile-menu-btn {
  display: none;
  background: none; border: none;
  color: var(--text-primary);
  font-size: 1.5rem; cursor: pointer;
}

.sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: var(--sidebar-width);
  height: calc(100vh - var(--header-height));
  background: var(--bg-sidebar);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-right: 4px solid var(--border-thick);
  overflow: hidden;
  padding: 1rem 0;
  z-index: 900;
  transition: width var(--sidebar-transition);
  animation: slideInLeft 0.5s ease;
}

.sidebar-inner {
  width: var(--sidebar-width);
  height: 100%;
  overflow-y: auto;
  padding-right: 6px;
  transition: width var(--sidebar-transition);
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed-width) !important;
}
.sidebar.collapsed .sidebar-inner {
  overflow: hidden;
}
.sidebar.collapsed .sidebar-inner > * {
  opacity: 0;
  pointer-events: none;
}

/* Sidebar grip (drag handle) */
.sidebar-grip {
  position: absolute;
  top: 0;
  right: 0;
  width: 4px;
  height: 100%;
  cursor: col-resize;
  z-index: 10;
  background: transparent;
  transition: background 0.15s;
}
.sidebar-grip:hover,
.sidebar-grip.active {
  background: var(--accent);
  opacity: 0.4;
}

/* Sidebar collapse toggle button */
.sidebar-toggle {
  position: absolute;
  top: 8px;
  right: -24px;
  width: 24px;
  height: 24px;
  border: 3px solid var(--border);
  border-left: none;
  background: var(--bg-sidebar);
  color: var(--text-tertiary);
  cursor: pointer;
  z-index: 11;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: all 0.15s;
  padding: 0;
  line-height: 1;
}
.sidebar-toggle:hover {
  color: var(--accent);
  background: var(--accent-light);
  border-color: var(--accent);
}
.sidebar.collapsed .sidebar-toggle {
  right: -24px;
}
.sidebar.collapsed .sidebar-toggle .toggle-icon {
  transform: rotate(180deg);
  display: inline-block;
}

body.sidebar-resizing {
  cursor: col-resize;
  user-select: none;
  -webkit-user-select: none;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.sidebar-section {
  margin-bottom: 1rem;
}

.sidebar-section-title {
  padding: 0.5rem 1.5rem;
  font-size: 0.7rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-tertiary);
}

.sidebar-link {
  display: block;
  padding: 0.5rem 1.5rem 0.5rem 2rem;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  transition: all var(--transition);
  border-left: 4px solid transparent;
  font-weight: 600;
}

.sidebar-link:hover {
  color: var(--text-primary);
  background: var(--accent-light);
  border-left-color: var(--accent);
}

.sidebar-link.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-light);
  font-weight: 700;
}

.sidebar-link.sub {
  padding-left: 2.5rem;
  font-size: 0.8125rem;
}

.main-layout {
  display: flex;
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height));
  transition: margin-left var(--sidebar-transition);
}

.content {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-width: 0;
  max-width: calc(100% - var(--sidebar-width));
  transition: margin-left var(--sidebar-transition), max-width var(--sidebar-transition);
}

.content-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 3rem;
}

.content > * {
  animation: fadeInUp 0.4s ease forwards;
  opacity: 0;
}

.content > *:nth-child(1) { animation-delay: 0.05s; }
.content > *:nth-child(2) { animation-delay: 0.1s; }
.content > *:nth-child(3) { animation-delay: 0.15s; }
.content > *:nth-child(4) { animation-delay: 0.2s; }
.content > *:nth-child(5) { animation-delay: 0.25s; }
.content > *:nth-child(6) { animation-delay: 0.3s; }
.content > *:nth-child(7) { animation-delay: 0.35s; }
.content > *:nth-child(8) { animation-delay: 0.4s; }

.toc {
  position: fixed;
  top: calc(var(--header-height) + 2rem);
  right: 2rem;
  width: var(--toc-width);
  max-height: calc(100vh - var(--header-height) - 4rem);
  overflow-y: auto;
  font-size: 0.8125rem;
  background: var(--bg-sidebar);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 4px solid var(--border);
  animation: fadeIn 0.5s ease;
}

.toc-title {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  margin-bottom: 0.75rem;
}

.toc-link {
  display: block;
  padding: 0.25rem 0;
  color: var(--text-tertiary);
  border-left: 2px solid var(--border-light);
  padding-left: 0.75rem;
  transition: all var(--transition);
}

.toc-link:hover { color: var(--text-primary); border-left-color: var(--accent); }
.toc-link.active { color: var(--accent); border-left-color: var(--accent); }

.breadcrumb {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  margin-bottom: 1.5rem;
}

.breadcrumb a { color: var(--text-tertiary); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { color: var(--border); }

.content h1 {
  font-size: 2.5rem;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--text-primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 3rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-primary);
  position: relative;
}

.content h2::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), transparent);
  border-radius: 2px;
}

.content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.content h4 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

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

.content ul, .content ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
  color: var(--text-secondary);
}

.content li { margin-bottom: 0.375rem; }
.content li::marker { color: var(--accent); }

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

.content .subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--bg-code);
  color: var(--text-code);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-light);
  direction: ltr;
  unicode-bidi: isolate;
}

pre {
  position: relative;
  background: var(--bg-code);
  border: 4px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
  overflow-x: auto;
  line-height: 1.6;
  transition: border-color var(--transition), box-shadow var(--transition);
  direction: ltr;
  text-align: left;
  unicode-bidi: isolate;
}

pre:hover {
  border-color: var(--accent);
  box-shadow: 0 0 25px var(--accent-glow);
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text-primary);
  font-size: 0.875rem;
  direction: ltr;
  text-align: left;
  unicode-bidi: isolate;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
  border: 4px solid var(--border);
  border-bottom: none;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  padding: 0.5rem 1rem;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-weight: 700;
}

.code-header + pre {
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  margin-top: 0;
}

.copy-btn {
  background: var(--bg-sidebar);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border: 2px solid var(--border);
  color: var(--text-tertiary);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 700;
  transition: all var(--transition);
}

.copy-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.copy-btn.copied {
  color: var(--success);
  border-color: var(--success);
}

.kw { color: #7c3aed; font-weight: 500; }
.fn { color: #6366f1; }
.st { color: #059669; }
.cm { color: #94a3b8; font-style: italic; }
.nm { color: #d97706; }
.op { color: #dc2626; }
.ty { color: #0891b2; }

[data-theme="dark"] .kw { color: #c084fc; }
[data-theme="dark"] .fn { color: #818cf8; }
[data-theme="dark"] .st { color: #34d399; }
[data-theme="dark"] .cm { color: #6b7280; }
[data-theme="dark"] .nm { color: #fbbf24; }
[data-theme="dark"] .op { color: #f87171; }
[data-theme="dark"] .ty { color: #22d3ee; }

.content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-size: var(--font-size-sm);
}

.content th, .content td {
  padding: 0.625rem 1rem;
  text-align: left;
  border: 3px solid var(--border);
}

.content th {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}

.content td { color: var(--text-secondary); }

.content tr:hover td { background: var(--accent-light); }

.callout {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  border-left: 6px solid;
  font-size: var(--font-size-sm);
  background: var(--bg-sidebar);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 3px solid var(--border);
  border-left-width: 6px;
}

.callout-title {
  font-weight: 600;
  margin-bottom: 0.375rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.callout-info { border-color: var(--info); }
.callout-info .callout-title { color: var(--info); }

.callout-warning { border-color: var(--warning); }
.callout-warning .callout-title { color: var(--warning); }

.callout-danger { border-color: var(--danger); }
.callout-danger .callout-title { color: var(--danger); }

.callout-tip { border-color: var(--success); }
.callout-tip .callout-title { color: var(--success); }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.feature-card {
  background: var(--bg-sidebar);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 4px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: all var(--transition);
  outline: 2px solid var(--border-light);
  outline-offset: -6px;
}

.feature-card:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 30px var(--accent-glow);
  transform: translateY(-6px);
  outline-color: var(--accent);
}

.feature-card .icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.doc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.doc-card {
  display: block;
  padding: 1.25rem;
  background: var(--bg-sidebar);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 4px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
  outline: 2px solid var(--border-light);
  outline-offset: -6px;
}

.doc-card:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 25px var(--accent-glow);
  transform: translateY(-4px);
  outline-color: var(--accent);
}

.doc-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.375rem;
  color: var(--text-primary);
}

.doc-card p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin: 0;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: 0;
}

.hero {
  background: var(--bg-hero);
  color: #fff;
  padding: 5rem 3rem 4rem;
  text-align: center;
  margin: calc(-1 * var(--header-height)) 0 0 0;
  position: relative;
  overflow: hidden;
  border-bottom: 6px solid #1e1b4b;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 50%, rgba(168,85,247,0.4) 0%, transparent 60%),
              radial-gradient(circle at 70% 50%, rgba(124,58,237,0.3) 0%, transparent 50%);
  animation: float 6s ease-in-out infinite;
}

.hero h1 {
  font-size: 4rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  margin-bottom: 1rem;
  position: relative;
  background: linear-gradient(135deg, #fff 0%, #c084fc 50%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.6s ease;
  text-transform: uppercase;
}

.hero .tagline {
  font-size: 1.25rem;
  color: rgba(255,255,255,0.8);
  max-width: 600px;
  margin: 0 auto 2rem;
  position: relative;
}

.hero .hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 800;
  cursor: pointer;
  transition: all var(--transition);
  border: 3px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, #7c3aed, #a855f7);
  color: #fff;
  border: 3px solid #1e1b4b;
  animation: glow 3s ease-in-out infinite;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #6d28d9, #9333ea);
  transform: translateY(-3px);
  box-shadow: 0 10px 30px var(--accent-glow);
}

.btn-secondary {
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: #fff;
  border: 3px solid rgba(255,255,255,0.4);
}

.btn-secondary:hover {
  border-color: #fff;
  color: #fff;
  background: rgba(255,255,255,0.2);
  transform: translateY(-3px);
}

.benchmark-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.benchmark-label {
  width: 140px;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  text-align: right;
}

.benchmark-track {
  flex: 1;
  height: 24px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.benchmark-fill {
  height: 100%;
  background: linear-gradient(90deg, #7c3aed, #a855f7, #c084fc);
  border-radius: var(--radius-sm);
  transition: width 1s ease;
  display: flex;
  align-items: center;
  padding-left: 0.5rem;
  font-size: 0.75rem;
  color: #fff;
  font-weight: 600;
  background-size: 200% auto;
  animation: shimmer 3s linear infinite;
}

.module-card {
  background: var(--bg-sidebar);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 4px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.module-card:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 25px var(--accent-glow);
}

.module-card-header {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: background var(--transition);
}

.module-card-header:hover {
  background: var(--accent-light);
}

.module-card-header h3 {
  margin: 0;
  font-size: 1.125rem;
}

.module-card-header .toggle-icon {
  transition: transform 0.2s;
  color: var(--text-tertiary);
}

.module-card-body {
  padding: 1.5rem;
}

.module-card-body.collapsed {
  display: none;
}

.fn-sig {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  background: var(--bg-code);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-light);
  margin-bottom: 0.5rem;
  display: inline-block;
}

.fn-desc {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

.footer {
  margin-left: var(--sidebar-width);
  border-top: 1px solid var(--border);
  padding: 2rem 3rem;
  text-align: center;
  color: var(--text-tertiary);
  font-size: var(--font-size-sm);
}

.footer a { color: var(--text-secondary); }

.feedback {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: var(--bg-sidebar);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 4px solid var(--border);
  border-radius: var(--radius-md);
  margin-top: 3rem;
  font-size: var(--font-size-sm);
}

.feedback button {
  background: var(--bg-sidebar);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border: 3px solid var(--border);
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 700;
  transition: all var(--transition);
}

.feedback button:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.feedback button.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.page-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-light);
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
}

.page-nav {
  display: flex;
  gap: 1rem;
}

.page-nav a {
  padding: 0.5rem 1rem;
  border: 3px solid var(--border);
  border-radius: var(--radius-md);
  font-weight: 700;
  transition: all var(--transition);
}

.page-nav a:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

@media (max-width: 1200px) {
  .toc { display: none; }
}

@media (max-width: 768px) {
  .mobile-menu-btn { display: block; }
  .sidebar {
    transform: translateX(-100%);
    width: 280px !important;
    z-index: 1100;
    transition: transform 0.3s ease;
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar.collapsed { width: 280px !important; }
  .sidebar.collapsed .sidebar-inner > * { opacity: 1; pointer-events: auto; }
  .sidebar.collapsed .sidebar-inner { overflow-y: auto; }
  .sidebar-grip { display: none; }
  .sidebar-toggle { display: none; }
  .content { margin-left: 0; max-width: 100%; transition: none; }
  .main-layout { transition: none; }
  .content-inner { padding: 1.5rem; }
  .footer { margin-left: 0; }
  .hero { padding: 3rem 1.5rem; }
  .hero h1 { font-size: 2rem; }
  .header-search { width: 200px; }
  .feature-grid { grid-template-columns: 1fr; }
}

@media print {
  .header, .sidebar, .toc, .footer, .feedback, .page-meta, .page-nav, .copy-btn, .header-actions { display: none !important; }
  .content { margin-left: 0; max-width: 100%; }
  .content-inner { max-width: 100%; padding: 0; }
  body { font-size: 12pt; color: #000; }
  pre { border: 1px solid #ccc; page-break-inside: avoid; }
  .hero { background: none; color: #000; padding: 1rem 0; }
  .hero h1 { -webkit-text-fill-color: #000; background: none; font-size: 24pt; }
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 10, 26, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1050;
}

.sidebar-overlay.active { display: block; }

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

[lang="fa"] .sidebar {
  left: auto;
  right: 0;
  border-right: none;
  border-left: 4px solid var(--border-thick);
}
[lang="fa"] .sidebar-grip {
  right: auto;
  left: 0;
}
[lang="fa"] .sidebar-toggle {
  right: auto;
  left: -24px;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  border: 3px solid var(--border);
  border-right: none;
}
[lang="fa"] .sidebar-link {
  border-left: none;
  border-right: 4px solid transparent;
  padding: 0.5rem 2rem 0.5rem 1.5rem;
}
[lang="fa"] .sidebar-link.active {
  border-left-color: transparent;
  border-right-color: var(--accent);
}
[lang="fa"] .sidebar-link.sub {
  padding-right: 2.5rem;
  padding-left: 1.5rem;
  border-right-width: 4px;
}
[lang="fa"] .main-layout {
  margin-left: 0;
}
[lang="fa"] .content {
  margin-left: 0;
  margin-right: var(--sidebar-width);
}
[lang="fa"] .lang-menu {
  right: auto;
  left: 0;
}
[lang="fa"] .header-search input {
  padding: 0.5rem 2.5rem 0.5rem 1rem;
}
[lang="fa"] .header-search .search-icon {
  left: auto;
  right: 0.75rem;
}
[lang="fa"] .toc {
  right: auto;
  left: 2rem;
  border: 4px solid var(--border);
}
[lang="fa"] .content-inner {
  text-align: right;
}
@media (max-width: 1024px) {
  [lang="fa"] .sidebar {
    transform: translateX(100%);
  }
  [lang="fa"] .sidebar.open {
    transform: translateX(0);
  }
  [lang="fa"] .content {
    margin-right: 0;
  }
}