/* ============================================================
   MULTILINGUAL PROGRAMMING LANGUAGE — DOCUMENTATION THEME
   Futuristic Dark Space Theme
   ============================================================ */

/* ---- Custom Properties ---- */
:root {
  /* Colors */
  --bg-primary: #080c14;
  --bg-secondary: #0d1220;
  --bg-card: #111827;
  --bg-card-hover: #162032;
  --bg-code: #0a0f1e;
  --bg-header: rgba(8, 12, 20, 0.92);

  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #080c14;

  --accent-cyan: #00d4ff;
  --accent-green: #00ff9f;
  --accent-purple: #9d4edd;
  --accent-blue: #3b82f6;
  --accent-orange: #f59e0b;

  --border-primary: rgba(0, 212, 255, 0.15);
  --border-secondary: rgba(255, 255, 255, 0.06);
  --border-code: rgba(0, 212, 255, 0.2);

  --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.1);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);

  /* Typography */
  --font-sans: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  /* Spacing */
  --nav-height: 64px;
  --sidebar-width: 260px;
  --toc-width: 220px;
  --content-max: 860px;
  --page-padding: 2rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

/* ---- Background Effects ---- */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

.bg-glow {
  position: fixed;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.04) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ---- Header / Nav ---- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--bg-header);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-primary);
  z-index: 100;
}

.nav-container {
  display: flex;
  align-items: center;
  gap: 1rem;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text-primary);
  flex-shrink: 0;
}

.brand-icon {
  width: 1rem;
  height: 1rem;
  display: block;
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.1rem;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.brand-version {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
  padding: 1px 6px;
  margin-left: 4px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-left: auto;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.08);
}

.nav-link-external .icon-github {
  opacity: 0.7;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  margin-left: auto;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: var(--transition-base);
}

/* ---- Site Layout ---- */
.site-layout {
  position: relative;
  z-index: 1;
  padding-top: var(--nav-height);
  min-height: 100vh;
}

/* ---- Page Layout (sidebar + content + toc) ---- */
.page-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr var(--toc-width);
  max-width: 1400px;
  margin: 0 auto;
  min-height: calc(100vh - var(--nav-height));
}

/* ---- Sidebar ---- */
.sidebar {
  position: sticky;
  top: var(--nav-height);
  height: calc(100vh - var(--nav-height));
  overflow-y: auto;
  border-right: 1px solid var(--border-secondary);
  background: var(--bg-secondary);
  padding: 1.5rem 0;
  scrollbar-width: thin;
  scrollbar-color: var(--border-primary) transparent;
}

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

.sidebar-inner { padding: 0 1rem; }

.sidebar-section {
  margin-bottom: 1.5rem;
}

.sidebar-section-title {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  margin-bottom: 0.25rem;
  border-radius: 4px;
  transition: color var(--transition-fast);
}

.sidebar-section-title:hover,
.sidebar-section-title.active {
  color: var(--accent-cyan);
}

.sidebar-items {
  list-style: none;
  padding: 0;
}

.sidebar-item { margin: 0; }

.sidebar-link {
  display: block;
  padding: 0.3rem 0.75rem;
  border-radius: 5px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast), background var(--transition-fast);
  border-left: 2px solid transparent;
}

.sidebar-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

.sidebar-link.active {
  color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.08);
  border-left-color: var(--accent-cyan);
}

/* ---- Main Content ---- */
.main-content {
  min-width: 0;
  padding: 2.5rem var(--page-padding);
}

.content-article {
  max-width: var(--content-max);
}

.content-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-secondary);
}

.content-category {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 0.75rem;
}

.content-title {
  font-family: var(--font-sans);
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.2;
  background: linear-gradient(135deg, #fff 0%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.75rem;
}

.content-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.content-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

/* ---- TOC Panel ---- */
.toc-panel {
  position: sticky;
  top: var(--nav-height);
  height: calc(100vh - var(--nav-height));
  overflow-y: auto;
  border-left: 1px solid var(--border-secondary);
  padding: 1.5rem 1rem;
  scrollbar-width: thin;
}

.toc-title {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.toc-list {
  font-size: 0.8rem;
}

.toc-list a {
  display: block;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.2rem 0;
  border-left: 2px solid var(--border-secondary);
  padding-left: 0.75rem;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  line-height: 1.4;
}

.toc-list a:hover {
  color: var(--accent-cyan);
  border-left-color: var(--accent-cyan);
}

.toc-list a.toc-h3 { padding-left: 1.5rem; font-size: 0.75rem; }

/* ---- Content Body Styles ---- */
.content-body h1,
.content-body h2,
.content-body h3,
.content-body h4,
.content-body h5,
.content-body h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-primary);
  scroll-margin-top: calc(var(--nav-height) + 1rem);
}

.content-body h1 { font-size: 2rem; margin: 2rem 0 1rem; }
.content-body h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-secondary);
  color: var(--accent-cyan);
}
.content-body h3 { font-size: 1.2rem; margin: 2rem 0 0.75rem; color: var(--accent-green); }
.content-body h4 { font-size: 1rem; margin: 1.5rem 0 0.5rem; color: var(--text-primary); }

.content-body p { margin-bottom: 1.25rem; color: var(--text-primary); }

.content-body a {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: rgba(0, 212, 255, 0.3);
  transition: color var(--transition-fast);
}
.content-body a:hover { color: var(--accent-green); }

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

.content-body ul,
.content-body ol {
  margin: 1rem 0 1.25rem 1.5rem;
}

.content-body li {
  margin-bottom: 0.4rem;
  color: var(--text-primary);
}

.content-body li + li { margin-top: 0.3rem; }

/* ---- Code Blocks ---- */
.content-body code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid var(--border-code);
  border-radius: 4px;
  padding: 0.15em 0.4em;
  color: var(--accent-cyan);
}

.content-body pre {
  background: var(--bg-code);
  border: 1px solid var(--border-code);
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.5rem 0;
  position: relative;
}

.content-body pre::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
  border-radius: 8px 8px 0 0;
}

.content-body pre code {
  background: none;
  border: none;
  padding: 1.25rem 1.5rem;
  color: var(--text-primary);
  font-size: 0.875rem;
  line-height: 1.7;
  display: block;
}

/* Rouge syntax highlighting */
.highlight { background: var(--bg-code) !important; border-radius: 8px; }
.highlight .k  { color: #c792ea; }  /* keyword */
.highlight .kn { color: #c792ea; }  /* keyword.namespace */
.highlight .kd { color: #c792ea; }  /* keyword.declaration */
.highlight .nb { color: #82aaff; }  /* builtin */
.highlight .nf { color: #82aaff; }  /* function name */
.highlight .nc { color: #ffcb6b; }  /* class name */
.highlight .s  { color: #c3e88d; }  /* string */
.highlight .s1 { color: #c3e88d; }
.highlight .s2 { color: #c3e88d; }
.highlight .mi { color: #f78c6c; }  /* integer */
.highlight .mf { color: #f78c6c; }  /* float */
.highlight .cm { color: #546e7a; font-style: italic; }  /* comment */
.highlight .c1 { color: #546e7a; font-style: italic; }
.highlight .o  { color: #89ddff; }  /* operator */
.highlight .p  { color: #89ddff; }  /* punctuation */

/* ---- Tables ---- */
.content-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.875rem;
  border: 1px solid var(--border-secondary);
  border-radius: 8px;
  overflow: hidden;
}

.content-body thead {
  background: rgba(0, 212, 255, 0.08);
}

.content-body th {
  padding: 0.75rem 1rem;
  text-align: left;
  font-weight: 600;
  color: var(--accent-cyan);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-primary);
}

.content-body td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-secondary);
  color: var(--text-primary);
}

.content-body tr:last-child td { border-bottom: none; }

.content-body tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

/* ---- Blockquotes ---- */
.content-body blockquote {
  border-left: 3px solid var(--accent-cyan);
  background: rgba(0, 212, 255, 0.05);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 8px 8px 0;
}

.content-body blockquote p { color: var(--text-secondary); margin: 0; }

/* ---- Badges ---- */
.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid var(--border-primary);
  color: var(--accent-cyan);
}

.badge-success { background: rgba(0, 255, 159, 0.1); border-color: rgba(0, 255, 159, 0.3); color: var(--accent-green); }
.badge-warning { background: rgba(245, 158, 11, 0.1); border-color: rgba(245, 158, 11, 0.3); color: var(--accent-orange); }
.badge-danger  { background: rgba(239, 68, 68, 0.1); border-color: rgba(239, 68, 68, 0.3); color: #ef4444; }
.badge-purple  { background: rgba(157, 78, 221, 0.1); border-color: rgba(157, 78, 221, 0.3); color: var(--accent-purple); }

/* ---- Cards ---- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-secondary);
  border-radius: 12px;
  padding: 1.5rem;
  transition: border-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

.card:hover::before { opacity: 1; }

.card-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
  display: block;
}

.card h3 {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.5;
}

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

.card a::after {
  content: '';
  position: absolute;
  inset: 0;
}

/* ---- Language Pills ---- */
.lang-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
}

.lang-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.75rem;
  border-radius: 100px;
  background: var(--bg-card);
  border: 1px solid var(--border-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.lang-pill:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.06);
}

.lang-code {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  background: rgba(0, 212, 255, 0.1);
  border-radius: 3px;
  padding: 1px 5px;
  color: var(--accent-cyan);
}

/* ---- Callout Boxes ---- */
.callout {
  display: flex;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-radius: 8px;
  margin: 1.5rem 0;
  border: 1px solid;
}

.callout-icon { font-size: 1.25rem; flex-shrink: 0; line-height: 1.5; }
.callout-content { flex: 1; min-width: 0; }
.callout-content p { margin: 0; font-size: 0.9rem; }
.callout-content strong { display: block; margin-bottom: 0.25rem; }

.callout-info    { background: rgba(59, 130, 246, 0.07); border-color: rgba(59, 130, 246, 0.3); }
.callout-tip     { background: rgba(0, 255, 159, 0.05); border-color: rgba(0, 255, 159, 0.3); }
.callout-warning { background: rgba(245, 158, 11, 0.07); border-color: rgba(245, 158, 11, 0.3); }
.callout-danger  { background: rgba(239, 68, 68, 0.07); border-color: rgba(239, 68, 68, 0.3); }

/* ---- Page Navigation ---- */
.page-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-secondary);
}

.page-nav-prev,
.page-nav-next {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-secondary);
  border-radius: 8px;
  text-decoration: none;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.page-nav-next { text-align: right; }

.page-nav-prev:hover,
.page-nav-next:hover {
  border-color: var(--border-primary);
  background: var(--bg-card-hover);
}

.page-nav-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-weight: 600;
}

.page-nav-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent-cyan);
}

/* ---- Hero Section (Landing Page) ---- */
.hero {
  padding: 6rem 2rem 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(0, 212, 255, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid var(--border-primary);
  border-radius: 100px;
  padding: 0.3rem 1rem;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-family: var(--font-sans);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-purple) 50%, var(--accent-green) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  color: var(--text-inverse);
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid var(--border-secondary);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-primary);
}

/* ---- Stats Strip ---- */
.stats-strip {
  display: flex;
  justify-content: center;
  gap: 3rem;
  flex-wrap: wrap;
  padding: 2rem;
  border-top: 1px solid var(--border-secondary);
  border-bottom: 1px solid var(--border-secondary);
}

.stat-item { text-align: center; }

.stat-value {
  font-family: var(--font-sans);
  font-size: 2.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}

/* ---- Feature Grid ---- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 3rem 0;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-secondary);
  border-radius: 16px;
  padding: 2rem;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}

.feature-card:hover {
  border-color: var(--border-primary);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.feature-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 120px;
  height: 120px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1.25rem;
  display: block;
}

.feature-title {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.feature-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ---- Code Demo (landing) ---- */
.code-demo {
  max-width: 860px;
  margin: 3rem auto;
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.code-demo-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 1.25rem;
  background: rgba(0, 212, 255, 0.06);
  border-bottom: 1px solid var(--border-primary);
}

.code-demo-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot-red    { background: #ff5f57; }
.dot-yellow { background: #febc2e; }
.dot-green  { background: #28c840; }

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

.code-demo-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-secondary);
  background: var(--bg-code);
}

.code-tab {
  padding: 0.6rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
}

.code-tab.active, .code-tab:hover {
  color: var(--accent-cyan);
  border-bottom-color: var(--accent-cyan);
}

.code-demo-body {
  background: var(--bg-code);
}

.code-demo-body pre {
  margin: 0 !important;
  border: none !important;
  border-radius: 0 !important;
  padding: 1.5rem !important;
}

.code-demo-body pre::before { display: none !important; }

/* ---- Language Showcase ---- */
.lang-showcase {
  padding: 4rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  display: block;
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: var(--font-sans);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.section-desc {
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.6;
  margin-bottom: 2.5rem;
}

/* ---- Full-page sections ---- */
.home-section {
  padding: 4rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.home-section + .home-section {
  border-top: 1px solid var(--border-secondary);
}

/* ---- Footer ---- */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-secondary);
  padding: 4rem 0 2rem;
  position: relative;
  z-index: 1;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  margin-bottom: 3rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.footer-logo .brand-icon { width: 1.25rem; height: 1.25rem; }
.footer-logo .brand-name {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.1rem;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-tagline {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.footer-badges { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.footer-col h4 {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 0.5rem; }

.footer-col a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.footer-col a:hover { color: var(--accent-cyan); }

.footer-bottom {
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-secondary);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-bottom a { color: var(--text-muted); text-decoration: underline; }
.footer-bottom a:hover { color: var(--accent-cyan); }

/* ---- Keyword Table Styles ---- */
.keyword-table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0;
}

.keyword-table {
  min-width: 700px;
}

.keyword-table th {
  white-space: nowrap;
}

/* ---- Responsive ---- */
@media (max-width: 1280px) {
  .toc-panel { display: none; }
  .page-layout { grid-template-columns: var(--sidebar-width) 1fr; }
}

@media (max-width: 860px) {
  .page-layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.open { display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: var(--bg-header); border-bottom: 1px solid var(--border-secondary); padding: 1rem; gap: 0.25rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-links { grid-template-columns: 1fr 1fr; }
  .stats-strip { gap: 2rem; }
  .hero { padding: 4rem 1.5rem 2rem; }
}

@media (max-width: 600px) {
  .footer-links { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: center; }
  .content-title { font-size: 1.75rem; }
  .main-content { padding: 1.5rem 1rem; }
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-primary); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-cyan); }
* { scrollbar-width: thin; scrollbar-color: var(--border-primary) var(--bg-primary); }

/* ---- Utilities ---- */
.text-cyan   { color: var(--accent-cyan); }
.text-green  { color: var(--accent-green); }
.text-purple { color: var(--accent-purple); }
.text-muted  { color: var(--text-muted); }
.font-mono   { font-family: var(--font-mono); }
.font-sans   { font-family: var(--font-sans); }
.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }

/* ---- Copy Button ---- */
.copy-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.2rem 0.6rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  opacity: 0;
}

pre:hover .copy-btn { opacity: 1; }
.copy-btn:hover { color: var(--accent-cyan); background: rgba(0, 212, 255, 0.2); }

/* ---- Print ---- */
@media print {
  .site-header, .sidebar, .toc-panel, .site-footer { display: none; }
  .page-layout { display: block; }
  .main-content { padding: 0; }
  body { background: white; color: black; }
}