:root {
  /* Light mode colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #f1f3f5;
  --text-primary: #212529;
  --text-secondary: #495057;
  --text-tertiary: #6c757d;
  --border-color: #dee2e6;
  --accent: #0d6efd;
  --accent-hover: #0b5ed7;
  --code-bg: #f8f9fa;
  --code-border: #e9ecef;
  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-lg: rgba(0, 0, 0, 0.15);
  --sidebar-width: 280px;
}

[data-theme="dark"] {
  /* Dark mode colors */
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --text-primary: #c9d1d9;
  --text-secondary: #8b949e;
  --text-tertiary: #6e7681;
  --border-color: #30363d;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --code-bg: #161b22;
  --code-border: #30363d;
  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-lg: rgba(0, 0, 0, 0.5);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Header */
.header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.header-content {
  max-width: 100%;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-link {
  text-decoration: none;
  color: inherit;
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.version-selector {
  display: flex;
  align-items: center;
}

.version-select {
  padding: 0.375rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
}

.version-select:hover {
  border-color: var(--accent);
}

.version-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb, 13, 110, 253), 0.1);
}

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

/* Hamburger menu button */
.menu-toggle {
  display: none; /* Hidden on desktop */
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text-primary);
  transition: opacity 0.2s;
  width: 40px;
  height: 40px;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.menu-toggle:hover {
  opacity: 0.7;
}

.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

.hamburger {
  display: flex;
  flex-direction: column;
  width: 24px;
  height: 18px;
  justify-content: space-between;
}

.hamburger span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.github-link {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.5rem;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--text-secondary);
  text-decoration: none;
}

.github-link:hover {
  background: var(--bg-secondary);
  color: var(--accent);
  border-color: var(--accent);
  transform: scale(1.05);
}

.github-link svg {
  width: 20px;
  height: 20px;
}

.theme-toggle {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.5rem;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
}

.theme-toggle:hover {
  background: var(--bg-secondary);
  transform: scale(1.05);
}

.theme-icon {
  font-size: 1.25rem;
  line-height: 1;
}

/* Layout */
.layout {
  display: flex;
  min-height: calc(100vh - 80px);
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  position: sticky;
  top: 80px;
  height: calc(100vh - 80px);
  overflow-y: auto;
  overflow-x: hidden;
}

.sidebar-header {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  background: var(--bg-secondary);
  z-index: 10;
}

.sidebar-search {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-family: inherit;
  transition: all 0.2s;
}

.sidebar-search:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb, 13, 110, 253), 0.1);
}

.sidebar-nav {
  padding: 0.5rem 0;
}

.nav-category {
  margin-bottom: 0.25rem;
}

.nav-category-toggle {
  width: 100%;
  padding: 0.75rem 1rem;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 0.9375rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.2s;
  font-family: inherit;
}

.nav-category-toggle:hover {
  background: var(--bg-tertiary);
}

.nav-category-toggle.active {
  background: var(--bg-tertiary);
}

.toggle-icon {
  font-size: 0.75rem;
  transition: transform 0.2s;
  color: var(--text-tertiary);
}

.nav-category-toggle.collapsed .toggle-icon {
  transform: rotate(-90deg);
}

.nav-items {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.nav-items.expanded {
  max-height: 2000px;
}

.nav-item {
  display: block;
  padding: 0.5rem 1rem 0.5rem 2rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: all 0.2s;
  border-left: 3px solid transparent;
}

.nav-item:hover {
  background: var(--bg-tertiary);
  color: var(--accent);
  border-left-color: var(--accent);
}

.nav-item.active {
  background: var(--bg-tertiary);
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 500;
}

.nav-item.hidden {
  display: none;
}

.nav-section-link {
  font-weight: 600;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 0.5rem;
  display: block;
}

.nav-section-link:hover {
  background: var(--bg-tertiary);
  color: var(--accent);
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 2rem 3rem;
  max-width: calc(100vw - var(--sidebar-width));
  overflow-x: hidden;
}

.welcome-section {
  max-width: 800px;
}

.welcome-section h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.intro-text {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.8;
}

/* API Documentation */
.api-doc {
  max-width: 900px;
}

.api-doc-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--border-color);
}

.api-doc-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
}

.api-doc-meta {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.api-type-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--bg-tertiary);
  color: var(--text-tertiary);
  border-radius: 4px;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.api-since {
  color: var(--text-tertiary);
  font-size: 0.875rem;
}

.api-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin: 1.5rem 0;
  line-height: 1.8;
}

.api-signature {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 8px;
  padding: 1rem;
  margin: 1.5rem 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9375rem;
  overflow-x: auto;
  color: var(--text-primary);
}

.api-section {
  margin: 2rem 0;
}

.api-section-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.api-argument,
.api-return,
.api-method-item {
  margin: 1rem 0;
  padding: 1rem;
  background: var(--bg-secondary);
  border-radius: 8px;
  border-left: 3px solid var(--accent);
}

.api-argument-name,
.api-return-type {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.api-argument-type {
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-tertiary);
  font-size: 0.875rem;
}

.api-argument-desc {
  color: var(--text-secondary);
  margin-top: 0.5rem;
  font-size: 0.9375rem;
}

.api-optional {
  color: var(--text-tertiary);
  font-size: 0.8125rem;
  font-style: italic;
}

.api-example {
  margin: 1.5rem 0;
}

.concept-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  margin: 1.5rem 0;
}

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

.concept-card ul {
  margin-left: 1.5rem;
  margin-top: 0.75rem;
  color: var(--text-secondary);
}

.concept-card li {
  margin: 0.5rem 0;
}

.concept-card strong {
  color: var(--accent);
}

.code-block {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 12px;
  overflow: hidden;
  margin: 1rem 0;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
}

.code-header span {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.copy-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.375rem 0.75rem;
  border-radius: 6px;
  font-size: 0.8125rem;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.copy-btn:hover {
  background: var(--bg-primary);
  color: var(--accent);
  border-color: var(--accent);
}

.code-block pre {
  margin: 0;
  padding: 1.5rem;
  overflow-x: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9375rem;
  line-height: 1.7;
}

.code-block code {
  color: var(--text-primary);
}

.code-block .keyword {
  color: #d73a49;
}

[data-theme="dark"] .code-block .keyword {
  color: #ff7b72;
}

.code-block .string {
  color: #032f62;
}

[data-theme="dark"] .code-block .string {
  color: #a5d6ff;
}

.code-block .number {
  color: #005cc5;
}

[data-theme="dark"] .code-block .number {
  color: #79c0ff;
}

.code-block .comment {
  color: #6a737d;
  font-style: italic;
}

[data-theme="dark"] .code-block .comment {
  color: #8b949e;
}

.code-block .function {
  color: #6f42c1;
}

[data-theme="dark"] .code-block .function {
  color: #d2a8ff;
}

.code-block .class {
  color: #e36209;
}

[data-theme="dark"] .code-block .class {
  color: #ffa657;
}

.code-block .type {
  color: #005cc5;
}

[data-theme="dark"] .code-block .type {
  color: #79c0ff;
}

.code-block .property {
  color: #005cc5;
}

[data-theme="dark"] .code-block .property {
  color: #79c0ff;
}

/* Responsive */
@media (max-width: 1024px) {
  .menu-toggle {
    display: flex; /* Show hamburger menu on tablet and below */
  }

  .sidebar {
    position: fixed;
    left: 0;
    top: 60px;
    height: calc(100vh - 60px);
    transform: translateX(-100%);
    z-index: 200;
    box-shadow: 2px 0 10px var(--shadow-lg);
  }

  .sidebar.open {
    transform: translateX(0);
  }

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

  .main-content {
    margin-left: 0;
    max-width: 100%;
    padding: 2rem 1.5rem;
  }
}

@media (max-width: 768px) {
  .header-content {
    padding: 1rem;
    flex-wrap: wrap;
  }

  .top-nav {
    display: none;
  }

  .main-content {
    padding: 1.5rem;
  }

  .api-doc-title {
    font-size: 1.5rem;
  }
}

/* Smooth scroll */
html {
  scroll-behavior: smooth;
}

/* Selection */
::selection {
  background: var(--accent);
  color: white;
}

[data-theme="dark"] ::selection {
  background: var(--accent);
  color: #0d1117;
}