/* ==========================================================================
   OKX 2PA Agent Documentation Design System
   Modern, Sleek, High-Legibility Technical Docs
   ========================================================================== */

:root {
  /* Color Palette - Dark Theme (Default) */
  --bg-app: #090d16;
  --bg-surface: #0f172a;
  --bg-surface-raised: #1e293b;
  --bg-surface-hover: #27354f;
  --bg-header: rgba(9, 13, 22, 0.85);
  --bg-sidebar: #0c1322;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --bg-code: #0b1120;
  --bg-code-header: #131b2e;
  --bg-input: #131d33;

  --text-main: #e2e8f0;
  --text-heading: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-inverse: #0f172a;

  --border-main: #1e293b;
  --border-subtle: #172033;
  --border-highlight: #334155;
  --border-focus: #3b82f6;

  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --primary-glow: rgba(59, 130, 246, 0.25);
  --primary-subtle: rgba(59, 130, 246, 0.12);

  --accent-green: #10b981;
  --accent-green-subtle: rgba(16, 185, 129, 0.12);
  --accent-amber: #f59e0b;
  --accent-amber-subtle: rgba(245, 158, 11, 0.12);
  --accent-red: #ef4444;
  --accent-red-subtle: rgba(239, 68, 68, 0.12);
  --accent-purple: #8b5cf6;
  --accent-purple-subtle: rgba(139, 92, 246, 0.12);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.2);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --header-height: 64px;
  --sidebar-width: 290px;
  --toc-width: 240px;
  --content-max-width: 900px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* Light Theme Variables */
[data-theme="light"] {
  --bg-app: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-raised: #f1f5f9;
  --bg-surface-hover: #e2e8f0;
  --bg-header: rgba(255, 255, 255, 0.9);
  --bg-sidebar: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-code: #0f172a;
  --bg-code-header: #1e293b;
  --bg-input: #ffffff;

  --text-main: #334155;
  --text-heading: #0f172a;
  --text-muted: #64748b;
  --text-dim: #94a3b8;
  --text-inverse: #ffffff;

  --border-main: #e2e8f0;
  --border-subtle: #edf2f7;
  --border-highlight: #cbd5e1;
  --border-focus: #2563eb;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-glow: rgba(37, 99, 235, 0.15);
  --primary-subtle: rgba(37, 99, 235, 0.08);

  --accent-green: #059669;
  --accent-green-subtle: rgba(5, 150, 105, 0.08);
  --accent-amber: #d97706;
  --accent-amber-subtle: rgba(217, 119, 6, 0.08);
  --accent-red: #dc2626;
  --accent-red-subtle: rgba(220, 38, 38, 0.08);
  --accent-purple: #7c3aed;
  --accent-purple-subtle: rgba(124, 58, 237, 0.08);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(37, 99, 235, 0.1);
}

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

html {
  font-size: 15px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-main);
  line-height: 1.68;
  letter-spacing: -0.01em;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Selection */
::selection {
  background: var(--primary);
  color: #ffffff;
}

/* Links */
a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Layout Hierarchy */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ==========================================================================
   Header Navbar
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--bg-header);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-main);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-heading);
  font-weight: 700;
  font-size: 1.15rem;
}

.brand-logo {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: block;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-title {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-heading);
}

.brand-sub {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.version-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  background: var(--primary-subtle);
  color: var(--primary);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 600;
}

.header-center {
  flex: 1;
  max-width: 440px;
  margin: 0 20px;
}

.search-trigger {
  width: 100%;
  height: 38px;
  background: var(--bg-input);
  border: 1px solid var(--border-main);
  border-radius: var(--radius-md);
  padding: 0 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.88rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.search-trigger:hover {
  border-color: var(--border-highlight);
  color: var(--text-main);
  background: var(--bg-surface-raised);
}

.search-trigger-content {
  display: flex;
  align-items: center;
  gap: 10px;
}

.search-kbd {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  background: var(--bg-surface);
  border: 1px solid var(--border-main);
  border-radius: 4px;
  padding: 2px 6px;
  color: var(--text-dim);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 12px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-main);
  background: var(--bg-surface-raised);
  border: 1px solid var(--border-main);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.header-btn:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-highlight);
  color: var(--text-heading);
}

.header-btn.live-demo-btn {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(59, 130, 246, 0.15));
  border-color: rgba(16, 185, 129, 0.4);
  color: #34d399;
}

.header-btn.live-demo-btn:hover {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.25), rgba(59, 130, 246, 0.25));
  border-color: #10b981;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  display: inline-block;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse-dot-anim 2s infinite;
}

@keyframes pulse-dot-anim {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.icon-btn {
  width: 36px;
  height: 36px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--bg-surface-raised);
  border: 1px solid var(--border-main);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  color: var(--text-heading);
  background: var(--bg-surface-hover);
  border-color: var(--border-highlight);
}

.menu-toggle {
  display: none;
}

/* ==========================================================================
   Main Layout: Sidebar + Content + TOC
   ========================================================================== */
.doc-layout {
  display: flex;
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height));
  position: relative;
}

/* Sidebar */
.site-sidebar {
  width: var(--sidebar-width);
  height: calc(100vh - var(--header-height));
  position: fixed;
  top: var(--header-height);
  left: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-main);
  overflow-y: auto;
  padding: 24px 16px 40px 20px;
  scrollbar-width: thin;
  scrollbar-color: var(--border-highlight) transparent;
  z-index: 90;
  transition: transform var(--transition-normal);
}

.sidebar-group {
  margin-bottom: 24px;
}

.sidebar-group-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  padding: 6px 12px;
  margin-bottom: 4px;
}

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

.sidebar-nav-item {
  margin-bottom: 2px;
}

.sidebar-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  line-height: 1.4;
  transition: all var(--transition-fast);
  border-left: 2px solid transparent;
}

.sidebar-link:hover {
  color: var(--text-heading);
  background: var(--bg-surface-raised);
}

.sidebar-link.active {
  color: var(--primary);
  font-weight: 600;
  background: var(--primary-subtle);
  border-left: 2px solid var(--primary);
}

.nav-badge {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 10px;
  text-transform: uppercase;
}

.nav-badge.hot {
  background: rgba(239, 68, 68, 0.2);
  color: #f87171;
}

.nav-badge.new {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
}

.nav-badge.core {
  background: rgba(59, 130, 246, 0.2);
  color: #60a5fa;
}

/* Main Content Area */
.doc-main {
  flex: 1;
  margin-left: var(--sidebar-width);
  margin-right: var(--toc-width);
  padding: 40px 48px 80px 48px;
  max-width: calc(100% - var(--sidebar-width) - var(--toc-width));
  min-width: 0;
}

.doc-content-wrapper {
  max-width: var(--content-max-width);
  margin: 0 auto;
}

/* Right TOC (Table of Contents) */
.site-toc {
  width: var(--toc-width);
  height: calc(100vh - var(--header-height));
  position: fixed;
  top: var(--header-height);
  right: 0;
  overflow-y: auto;
  padding: 32px 20px 40px 16px;
  border-left: 1px solid var(--border-main);
  scrollbar-width: thin;
  font-size: 0.82rem;
}

.toc-title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.toc-list {
  list-style: none;
  border-left: 1px solid var(--border-main);
  padding-left: 10px;
}

.toc-item {
  margin-bottom: 6px;
}

.toc-item.level-3 {
  padding-left: 12px;
}

.toc-link {
  display: block;
  color: var(--text-dim);
  line-height: 1.4;
  padding: 3px 0;
  transition: all var(--transition-fast);
}

.toc-link:hover {
  color: var(--text-main);
}

.toc-link.active {
  color: var(--primary);
  font-weight: 600;
}

.toc-footer {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--border-main);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toc-action-link {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-dim);
  font-size: 0.8rem;
}

.toc-action-link:hover {
  color: var(--primary);
}

/* ==========================================================================
   Documentation Typography & Content Elements
   ========================================================================== */

/* Hero Banner */
.hero-section {
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.7) 0%, rgba(15, 23, 42, 0.9) 100%);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-xl);
  padding: 36px 36px 32px;
  margin-bottom: 40px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.hero-section::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -80px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.18) 0%, rgba(0, 0, 0, 0) 70%);
  pointer-events: none;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border-main);
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}

.hero-tag.highlight {
  background: var(--primary-subtle);
  border-color: rgba(59, 130, 246, 0.4);
  color: #60a5fa;
}

.hero-title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-heading);
  line-height: 1.25;
  margin-bottom: 12px;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 24px;
  max-width: 720px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  border: 1px solid transparent;
}

.btn-primary {
  background: #2563eb;
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.4);
}

.btn-primary:hover {
  background: #1d4ed8;
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.5);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-surface);
  border-color: var(--border-highlight);
  color: var(--text-heading);
}

.btn-secondary:hover {
  background: var(--bg-surface-raised);
  color: var(--text-heading);
  border-color: var(--primary);
}

/* Headings */
.doc-section {
  margin-bottom: 56px;
  padding-top: 16px;
}

h2 {
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-heading);
  margin: 32px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 10px;
}

h2 .section-anchor {
  color: var(--text-dim);
  font-size: 1.1rem;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

h2:hover .section-anchor {
  opacity: 1;
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-heading);
  margin: 28px 0 12px;
}

h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-heading);
  margin: 20px 0 8px;
}

p {
  margin-bottom: 16px;
  color: var(--text-main);
  line-height: 1.7;
}

ul, ol {
  margin-bottom: 18px;
  padding-left: 24px;
}

li {
  margin-bottom: 6px;
  line-height: 1.65;
}

li strong {
  color: var(--text-heading);
}

/* Feature Cards Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin: 24px 0 32px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-main);
  border-radius: var(--radius-lg);
  padding: 22px;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 14px;
  background: var(--bg-surface-raised);
  border: 1px solid var(--border-main);
}

.feature-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.feature-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 0;
}

/* Screenshot Frame & Lightbox Component */
.screenshot-container {
  margin: 28px 0 36px;
}

.screenshot-window {
  background: #0d1321;
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.window-header {
  height: 38px;
  background: #151d30;
  border-bottom: 1px solid #202b42;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
}

.window-dots {
  display: flex;
  align-items: center;
  gap: 7px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.window-title-text {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: #94a3b8;
}

.window-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.window-tag {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(59, 130, 246, 0.2);
  color: #60a5fa;
}

.screenshot-img-wrap {
  position: relative;
  cursor: zoom-in;
  overflow: hidden;
  background: #070a10;
}

.screenshot-img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-normal);
}

.screenshot-img-wrap:hover .screenshot-img {
  transform: scale(1.015);
}

.zoom-hint-overlay {
  position: absolute;
  bottom: 14px;
  right: 14px;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(6px);
  border: 1px solid var(--border-highlight);
  color: #e2e8f0;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  gap: 6px;
  opacity: 0.85;
  transition: opacity var(--transition-fast);
}

.screenshot-img-wrap:hover .zoom-hint-overlay {
  opacity: 1;
}

.screenshot-caption {
  font-size: 0.82rem;
  color: var(--text-dim);
  text-align: center;
  margin-top: 10px;
  font-style: normal;
}

/* Lightbox Modal */
.lightbox-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.lightbox-modal.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-img-wrapper {
  max-width: 95vw;
  max-height: 85vh;
  position: relative;
}

.lightbox-img {
  max-width: 100%;
  max-height: 85vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  border: 1px solid #334155;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8);
}

.lightbox-caption {
  color: #f8fafc;
  font-size: 0.95rem;
  margin-top: 16px;
  font-weight: 500;
  text-align: center;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: rgba(30, 41, 59, 0.8);
  border: 1px solid #475569;
  border-radius: 50%;
  color: #ffffff;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lightbox-close:hover {
  background: #ef4444;
  border-color: #ef4444;
}

/* Tabs Component */
.tab-container {
  margin: 24px 0;
  border: 1px solid var(--border-main);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-card);
}

.tab-nav {
  display: flex;
  background: var(--bg-surface-raised);
  border-bottom: 1px solid var(--border-main);
  padding: 4px 6px 0;
  gap: 4px;
  overflow-x: auto;
}

.tab-btn {
  padding: 8px 16px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text-heading);
}

.tab-btn.active {
  color: var(--primary);
  background: var(--bg-card);
  border-bottom: 2px solid var(--primary);
}

.tab-content-pane {
  padding: 20px;
  display: none;
}

.tab-content-pane.active {
  display: block;
  animation: fadeIn 0.2s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Code Blocks & Pre */
.code-block-wrapper {
  margin: 18px 0 24px;
  background: var(--bg-code);
  border: 1px solid var(--border-main);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.code-header {
  background: var(--bg-code-header);
  padding: 8px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
}

.code-lang {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
}

.code-title {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.copy-btn {
  background: transparent;
  border: 1px solid var(--border-main);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.75rem;
  padding: 3px 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  background: var(--bg-surface-raised);
  color: var(--text-heading);
  border-color: var(--border-highlight);
}

.copy-btn.copied {
  background: var(--accent-green-subtle);
  border-color: var(--accent-green);
  color: var(--accent-green);
}

pre {
  margin: 0;
  padding: 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
  color: #e2e8f0;
  tab-size: 2;
}

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--bg-surface-raised);
  color: #38bdf8;
  border: 1px solid var(--border-subtle);
}

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

/* Callout Alerts */
.callout {
  margin: 20px 0 24px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  border-left: 4px solid;
  background: var(--bg-surface);
  box-shadow: var(--shadow-sm);
}

.callout-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 6px;
}

.callout-body {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-main);
}

.callout-body p:last-child {
  margin-bottom: 0;
}

.callout-tip {
  border-left-color: var(--accent-green);
  background: var(--accent-green-subtle);
}
.callout-tip .callout-title { color: var(--accent-green); }

.callout-note {
  border-left-color: var(--primary);
  background: var(--primary-subtle);
}
.callout-note .callout-title { color: var(--primary); }

.callout-important {
  border-left-color: var(--accent-purple);
  background: var(--accent-purple-subtle);
}
.callout-important .callout-title { color: var(--accent-purple); }

.callout-warning {
  border-left-color: var(--accent-amber);
  background: var(--accent-amber-subtle);
}
.callout-warning .callout-title { color: var(--accent-amber); }

.callout-caution {
  border-left-color: var(--accent-red);
  background: var(--accent-red-subtle);
}
.callout-caution .callout-title { color: var(--accent-red); }

/* Tables */
.table-responsive {
  margin: 20px 0 28px;
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-main);
  background: var(--bg-card);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  text-align: left;
}

thead {
  background: var(--bg-surface-raised);
  border-bottom: 1px solid var(--border-main);
}

th {
  padding: 12px 16px;
  font-weight: 700;
  color: var(--text-heading);
  white-space: nowrap;
}

td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-main);
  line-height: 1.5;
}

tbody tr:last-child td {
  border-bottom: none;
}

tbody tr:hover {
  background: var(--bg-surface-hover);
}

.table-badge {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 600;
  font-family: var(--font-mono);
}

.table-badge.get { background: rgba(16, 185, 129, 0.2); color: #34d399; }
.table-badge.post { background: rgba(59, 130, 246, 0.2); color: #60a5fa; }
.table-badge.delete { background: rgba(239, 68, 68, 0.2); color: #f87171; }

/* Interactive Contract Calculator Demo Widget */
.calc-demo-box {
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.95), rgba(30, 41, 59, 0.9));
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 24px 0 32px;
  box-shadow: var(--shadow-md);
}

.calc-demo-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-main);
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 18px;
}

.calc-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.calc-field label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-dim);
}

.calc-field input, .calc-field select {
  height: 38px;
  background: var(--bg-input);
  border: 1px solid var(--border-main);
  border-radius: var(--radius-sm);
  color: var(--text-heading);
  padding: 0 12px;
  font-size: 0.9rem;
  font-family: var(--font-sans);
}

.calc-field input:focus, .calc-field select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
}

.calc-result-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  background: var(--bg-surface);
  border: 1px solid var(--border-main);
  border-radius: var(--radius-md);
  padding: 14px;
}

.calc-result-item {
  display: flex;
  flex-direction: column;
}

.calc-result-item small {
  font-size: 0.72rem;
  color: var(--text-dim);
}

.calc-result-item strong {
  font-size: 1.1rem;
  color: #38bdf8;
  font-family: var(--font-mono);
}

/* FAQ Accordions */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 24px 0 32px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-main);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--border-highlight);
}

.faq-header {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 600;
  color: var(--text-heading);
  font-size: 0.95rem;
  user-select: none;
}

.faq-icon {
  font-size: 0.8rem;
  color: var(--text-dim);
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-body {
  padding: 0 20px 18px;
  display: none;
  color: var(--text-main);
  font-size: 0.9rem;
  line-height: 1.65;
  border-top: 1px solid var(--border-subtle);
  padding-top: 14px;
}

.faq-item.active .faq-body {
  display: block;
}

/* Search Modal Overlay */
.search-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(6px);
  z-index: 200;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 12vh;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
}

.search-modal.active {
  opacity: 1;
  visibility: visible;
}

.search-box-card {
  width: 100%;
  max-width: 620px;
  background: var(--bg-surface);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.8);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.search-input-header {
  padding: 16px;
  border-bottom: 1px solid var(--border-main);
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-main-input {
  flex: 1;
  background: transparent;
  border: none;
  font-size: 1.1rem;
  color: var(--text-heading);
  outline: none;
}

.search-results-list {
  max-height: 380px;
  overflow-y: auto;
  padding: 10px;
  list-style: none;
}

.search-result-item {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 2px;
  transition: background var(--transition-fast);
}

.search-result-item:hover, .search-result-item.selected {
  background: var(--bg-surface-raised);
}

.search-result-title {
  font-weight: 600;
  color: var(--text-heading);
  font-size: 0.92rem;
}

.search-result-snippet {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.search-footer-bar {
  padding: 10px 16px;
  background: var(--bg-surface-raised);
  border-top: 1px solid var(--border-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-dim);
}

/* Footer */
.site-footer {
  margin-left: var(--sidebar-width);
  border-top: 1px solid var(--border-main);
  padding: 32px 48px;
  background: var(--bg-surface);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

/* Promo Banner Cards */
.promo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 18px;
  margin: 20px 0 30px;
}

.promo-card {
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.7) 0%, rgba(15, 23, 42, 0.95) 100%);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-fast);
}

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

.promo-card.okx-promo {
  border-left: 4px solid #10b981;
}

.promo-card.minimax-promo {
  border-left: 4px solid #f59e0b;
}

.promo-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.promo-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.promo-icon {
  font-size: 1.5rem;
}

.promo-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-heading);
}

.promo-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 12px;
  text-transform: uppercase;
}

.promo-badge.green {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.promo-badge.orange {
  background: rgba(245, 158, 11, 0.2);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.4);
}

.promo-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
}

.promo-desc p {
  margin-bottom: 8px;
}

.promo-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.promo-btn.okx-btn {
  background: linear-gradient(135deg, #059669, #10b981);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

.promo-btn.okx-btn:hover {
  background: linear-gradient(135deg, #047857, #059669);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.5);
}

.promo-btn.minimax-btn {
  background: linear-gradient(135deg, #d97706, #f59e0b);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

.promo-btn.minimax-btn:hover {
  background: linear-gradient(135deg, #b45309, #d97706);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.5);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1200px) {
  .site-toc {
    display: none;
  }
  .doc-main {
    margin-right: 0;
    max-width: calc(100% - var(--sidebar-width));
  }
}

@media (max-width: 860px) {
  .site-sidebar {
    transform: translateX(-100%);
  }
  .site-sidebar.mobile-open {
    transform: translateX(0);
  }
  .doc-main {
    margin-left: 0;
    max-width: 100%;
    padding: 24px 20px 60px;
  }
  .menu-toggle {
    display: inline-flex;
  }
  .header-center {
    display: none;
  }
  .site-footer {
    margin-left: 0;
    padding: 24px 20px;
  }
  .hero-title {
    font-size: 1.7rem;
  }
}