/* ============================================================
   xInfer Documentation — Design System
   Three themes: light (default), dark, enflame
   ============================================================ */

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --accent: #06b6d4;
  --accent-dark: #0891b2;
  --surface: #ffffff;
  --surface-alt: #f8fafc;
  --surface-hover: #f1f5f9;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #94a3b8;
  --code-bg: #f8fafc;
  --code-text: #1e293b;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --gradient-start: #6366f1;
  --gradient-end: #06b6d4;
  --glass: rgba(255,255,255,0.6);
  --glass-border: rgba(255,255,255,0.3);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 4px 16px rgba(0,0,0,0.06), 0 1px 3px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
  --shadow-xl: 0 24px 48px rgba(0,0,0,0.1), 0 8px 16px rgba(0,0,0,0.05);
  --shadow-glow: 0 0 30px rgba(99,102,241,0.12);
  --radius: 0.875rem;
  --radius-lg: 1.25rem;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --primary: #818cf8;
  --primary-dark: #6366f1;
  --primary-light: #a5b4fc;
  --accent: #22d3ee;
  --accent-dark: #06b6d4;
  --surface: #0b1120;
  --surface-alt: #131b2e;
  --surface-hover: #1e293b;
  --border: #1e293b;
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --code-bg: #0d1525;
  --code-text: #e2e8f0;
  --glass: rgba(11,17,32,0.7);
  --glass-border: rgba(30,41,59,0.5);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
  --shadow: 0 4px 16px rgba(0,0,0,0.3);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.4);
  --shadow-xl: 0 24px 48px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 30px rgba(129,140,248,0.15);
}

[data-theme="enflame"] {
  --primary: #f59e0b;
  --primary-dark: #d97706;
  --primary-light: #fbbf24;
  --accent: #ef4444;
  --accent-dark: #dc2626;
  --surface: #ffffff;
  --surface-alt: #FFFBF0;
  --surface-hover: #FFF7E6;
  --border: #F3E8D0;
  --text: #1a1005;
  --text-secondary: #5c4a2a;
  --text-tertiary: #9c8a6a;
  --code-bg: #FFFDF5;
  --code-text: #3d2e0a;
  --gradient-start: #f59e0b;
  --gradient-end: #ef4444;
  --glass: rgba(255,255,255,0.7);
  --glass-border: rgba(0,0,0,0.06);
  --shadow-glow: 0 0 30px rgba(245,158,11,0.15);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--surface);
  color: var(--text);
  line-height: 1.7;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}
code, pre, .code-block, .terminal {
  font-family: 'SF Mono', 'Cascadia Code', 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; display: block; }

.container { max-width: 1280px; margin: 0 auto; padding: 0 2rem; }

/* ---- Header ---- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: var(--glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  transition: all var(--transition);
}
.site-header.scrolled { box-shadow: var(--shadow); }
.header-inner {
  max-width: 1280px; margin: 0 auto; padding: 0 2rem;
  display: flex; align-items: center; height: 4rem; gap: 1.5rem;
}
.logo {
  display: flex; align-items: center; gap: 0.5rem;
  text-decoration: none; flex-shrink: 0;
}
.logo img { width: 2rem; height: 2rem; }
.logo span {
  font-weight: 800; font-size: 1.15rem;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-links { display: flex; align-items: center; gap: 0.25rem; margin-left: auto; }
.nav-links a {
  padding: 0.4rem 0.75rem; border-radius: 0.5rem;
  font-size: 0.875rem; font-weight: 500; color: var(--text-secondary);
  transition: all var(--transition); white-space: nowrap;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--primary); background: var(--surface-hover);
}
.nav-actions { display: flex; align-items: center; gap: 0.5rem; flex-shrink: 0; }

.lang-toggle {
  height: 2.25rem; padding: 0 0.875rem; border-radius: 0.625rem;
  border: 1px solid var(--border); background: var(--surface);
  color: var(--text-secondary); cursor: pointer;
  font-size: 0.8125rem; font-weight: 600; font-family: inherit;
  transition: all var(--transition);
}
.lang-toggle:hover { background: var(--surface-hover); transform: translateY(-1px); }

.theme-dropdown { position: relative; display: flex; align-items: center; }
.theme-select {
  height: 2.25rem; border-radius: 0.625rem; border: 1px solid var(--border);
  background: var(--surface); color: var(--text-secondary); cursor: pointer;
  font-size: 0.8125rem; font-weight: 600; font-family: inherit;
  padding: 0 1.75rem 0 1.75rem; appearance: none; -webkit-appearance: none;
  transition: all var(--transition);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 0.5rem center;
}
.theme-select:hover { background-color: var(--surface-hover); transform: translateY(-1px); }
.theme-select:focus { outline: 2px solid var(--primary); outline-offset: 1px; }

.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.625rem 1.25rem; border-radius: 0.625rem;
  font-weight: 600; font-size: 0.875rem; font-family: inherit;
  border: none; cursor: pointer; transition: all var(--transition);
  text-decoration: none; white-space: nowrap;
}
.btn-sm { padding: 0.375rem 0.875rem; font-size: 0.8125rem; }
.btn-primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: white; box-shadow: 0 2px 12px rgba(99,102,241,0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 4px 20px rgba(99,102,241,0.4); color: white; }
.btn-outline {
  background: transparent; color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover { background: var(--primary); color: white; transform: translateY(-2px); }
.btn-page {
  background: var(--surface); color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-page:hover { background: var(--surface-hover); transform: translateY(-1px); color: var(--text); }

.mobile-toggle {
  display: none; flex-direction: column; gap: 4px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.mobile-toggle span {
  width: 20px; height: 2px; background: var(--text-secondary);
  border-radius: 2px; transition: all var(--transition);
}

/* ---- Scroll Progress ---- */
.scroll-progress {
  position: fixed; top: 4rem; left: 0; height: 3px; z-index: 999;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  width: 0%; transition: width 0.1s linear;
  animation: gradientShift 3s ease infinite;
  background-size: 200%;
}
@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

/* ---- Hero ---- */
.hero {
  position: relative; padding: 8rem 0 5rem; overflow: hidden;
  min-height: 90vh; display: flex; align-items: center;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(99,102,241,0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(6,182,212,0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(139,92,246,0.08) 0%, transparent 50%),
    var(--surface);
}
[data-theme="dark"] .hero-bg {
  background:
    radial-gradient(ellipse at 20% 50%, rgba(99,102,241,0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(6,182,212,0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(139,92,246,0.1) 0%, transparent 50%),
    var(--surface);
}
[data-theme="enflame"] .hero-bg {
  background:
    radial-gradient(ellipse at 20% 50%, rgba(245,158,11,0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(239,68,68,0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(245,158,11,0.08) 0%, transparent 50%),
    var(--surface);
}
#particles { position: absolute; inset: 0; z-index: 1; }
.hero .container { position: relative; z-index: 2; }
.hero-grid {
  display: grid; grid-template-columns: 1fr 1.15fr; gap: 2.5rem; align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.375rem 1rem; border-radius: 2rem;
  background: rgba(99,102,241,0.08); border: 1px solid rgba(99,102,241,0.15);
  font-size: 0.8125rem; font-weight: 600; color: var(--primary);
  margin-bottom: 1.5rem;
}
[data-theme="enflame"] .hero-badge {
  background: rgba(245,158,11,0.1); border-color: rgba(245,158,11,0.2);
  color: var(--primary-dark);
}
.hero h1 { font-size: 3.5rem; font-weight: 800; line-height: 1.1; margin-bottom: 1.5rem; }
.gradient-text {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  background-size: 200%;
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientText 4s ease infinite;
}
@keyframes gradientText {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}
.hero p { font-size: 1.2rem; color: var(--text-secondary); margin-bottom: 2rem; max-width: 540px; }
.hero-buttons { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-code {
  background: var(--code-bg); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 1.5rem; position: relative;
  box-shadow: var(--shadow-lg);
}
.hero-code-header {
  display: flex; align-items: center; gap: 0.5rem;
  padding-bottom: 1rem; border-bottom: 1px solid var(--border); margin-bottom: 1rem;
}
.hero-code-dot { width: 10px; height: 10px; border-radius: 50%; }
.hero-code-dot:nth-child(1) { background: #ef4444; }
.hero-code-dot:nth-child(2) { background: #f59e0b; }
.hero-code-dot:nth-child(3) { background: #10b981; }
#hero-typing-code pre {
  min-height: 280px; font-size: 0.8rem; line-height: 1.8; color: var(--code-text);
  overflow-x: auto; white-space: pre;
}
.typing-cursor {
  display: inline-block; width: 2px; height: 1.1em; background: var(--primary);
  vertical-align: text-bottom; animation: blink 1s step-end infinite;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

/* Stats */
.stats-row { display: flex; gap: 2rem; margin-top: 3rem; flex-wrap: wrap; }
.stat-card {
  text-align: center; padding: 1rem 1.5rem;
  background: var(--glass); border: 1px solid var(--glass-border);
  border-radius: var(--radius); backdrop-filter: blur(10px);
  transition: all var(--transition);
}
.stat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.stat-card .stat-number {
  font-size: 2rem; font-weight: 800;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-card .stat-label { font-size: 0.8125rem; color: var(--text-tertiary); font-weight: 500; }

/* ---- Section ---- */
.section { padding: 5rem 0; }
.section-header { text-align: center; margin-bottom: 3.5rem; }
.section-header .overline {
  text-transform: uppercase; font-size: 0.75rem; font-weight: 700;
  letter-spacing: 0.1em; color: var(--primary); margin-bottom: 0.75rem;
  display: block;
}
.section-header h2 { font-size: 2.5rem; font-weight: 800; margin-bottom: 1rem; }
.section-header p { font-size: 1.1rem; color: var(--text-secondary); max-width: 640px; margin: 0 auto; }

/* ---- Features Grid ---- */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.feature-card {
  position: relative; overflow: hidden;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 2rem;
  transition: all var(--transition);
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  opacity: 0; transition: opacity var(--transition);
}
.feature-card::after {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(300px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(99,102,241,0.06), transparent);
  pointer-events: none; opacity: 0; transition: opacity var(--transition);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary-light); }
.feature-card:hover::before { opacity: 1; }
.feature-card:hover::after { opacity: 1; }
.feature-icon { font-size: 2rem; margin-bottom: 1rem; display: block; }
.feature-card h3 { font-size: 1.125rem; font-weight: 700; margin-bottom: 0.5rem; }
.feature-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

[data-theme="enflame"] .feature-card:hover { border-color: var(--primary-light); }
[data-theme="enflame"] .feature-card::after {
  background: radial-gradient(300px circle at var(--mouse-x,50%) var(--mouse-y,50%), rgba(245,158,11,0.08), transparent);
}

/* ---- Model Families ---- */
.model-families { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 1rem; }
.model-family {
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
  padding: 1.25rem 1rem; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); transition: all var(--transition); text-align: center;
}
.model-family:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--primary-light); }
.model-family-icon { font-size: 1.5rem; }
.model-family-name { font-size: 0.875rem; font-weight: 600; }

/* ---- Tables ---- */
.table-wrapper { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--border); margin: 1rem 0; }
.table-wrapper table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
.table-wrapper th {
  background: var(--surface-alt); font-weight: 700; text-align: left;
  padding: 0.875rem 1rem; border-bottom: 2px solid var(--border); white-space: nowrap;
}
.table-wrapper td { padding: 0.75rem 1rem; border-bottom: 1px solid var(--border); }
.table-wrapper tr:hover td { background: var(--surface-hover); }
.table-wrapper tr:last-child td { border-bottom: none; }

/* ---- Tabs ---- */
.tabs { display: flex; gap: 0.25rem; margin-bottom: 1.5rem; flex-wrap: wrap; }
.tab-btn {
  padding: 0.5rem 1rem; border-radius: 0.5rem; border: 1px solid var(--border);
  background: var(--surface); color: var(--text-secondary);
  font-size: 0.875rem; font-weight: 600; font-family: inherit;
  cursor: pointer; transition: all var(--transition);
}
.tab-btn:hover { background: var(--surface-hover); }
.tab-btn.active {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: white; border-color: transparent;
}
[data-theme="enflame"] .tab-btn.active { background: var(--primary); color: white; }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ---- Code Blocks ---- */
pre {
  background: var(--code-bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem 1.5rem;
  overflow-x: auto; position: relative;
  transition: box-shadow var(--transition); margin: 1rem 0;
}
pre:hover { box-shadow: var(--shadow); }
pre code { font-size: 0.8125rem; line-height: 1.8; color: var(--code-text); }
code:not([class]) {
  background: none; padding: 0.15em 0.4em;
  border-radius: 0.3rem; font-size: 0.875em; color: var(--primary-dark);
  border: none;
}
[data-theme="dark"] code:not([class]) { background: none; color: var(--primary-light); }
[data-theme="enflame"] code:not([class]) { background: none; color: var(--primary-dark); }
.copy-btn {
  position: absolute; top: 0.75rem; right: 0.75rem;
  padding: 0.3rem 0.6rem; border-radius: 0.375rem;
  background: var(--surface-hover); border: 1px solid var(--border);
  color: var(--text-tertiary); font-size: 0.75rem; font-family: inherit;
  cursor: pointer; transition: all var(--transition);
}
.copy-btn:hover { background: var(--primary); color: white; border-color: var(--primary); }

/* Syntax tokens */
.token-keyword { color: #7c3aed; }
.token-string { color: #059669; }
.token-comment { color: #94a3b8; font-style: italic; }
.token-flag { color: #6366f1; }
.token-value { color: #059669; }
.token-type { color: #0891b2; }
.token-number { color: #d97706; }
.token-op { color: #64748b; }

[data-theme="dark"] .token-keyword { color: #c084fc; }
[data-theme="dark"] .token-string { color: #34d399; }
[data-theme="dark"] .token-comment { color: #64748b; }
[data-theme="dark"] .token-flag { color: #818cf8; }
[data-theme="dark"] .token-value { color: #34d399; }
[data-theme="dark"] .token-type { color: #22d3ee; }
[data-theme="dark"] .token-number { color: #fbbf24; }

[data-theme="enflame"] .token-keyword { color: #d97706; }
[data-theme="enflame"] .token-string { color: #059669; }
[data-theme="enflame"] .token-flag { color: #f59e0b; }
[data-theme="enflame"] .token-number { color: #ef4444; }

/* ---- Steps ---- */
ol.steps { list-style: none; counter-reset: step-counter; }
.step-item {
  position: relative; padding: 1.5rem 1.5rem 1.5rem 4rem; margin-bottom: 1rem;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); counter-increment: step-counter;
  transition: all var(--transition);
}
.step-item::before {
  content: counter(step-counter); position: absolute; left: 1.25rem; top: 1.5rem;
  width: 1.75rem; height: 1.75rem; border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: white; font-size: 0.8125rem; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.step-item:hover { box-shadow: var(--shadow-sm); }

/* ---- Callouts ---- */
.callout-info, .callout-warning, .callout-success, .callout-danger {
  padding: 1.25rem 1.5rem; border-radius: var(--radius);
  margin: 1.25rem 0; border-left: 4px solid;
}
.callout-info { background: rgba(99,102,241,0.06); border-color: var(--primary); }
.callout-warning { background: rgba(245,158,11,0.06); border-color: var(--warning); }
.callout-success { background: rgba(16,185,129,0.06); border-color: var(--success); }
.callout-danger { background: rgba(239,68,68,0.06); border-color: var(--danger); }
.callout-title { font-weight: 700; margin-bottom: 0.25rem; font-size: 0.9rem; }
.callout-info .callout-title { color: var(--primary); }
.callout-warning .callout-title { color: var(--warning); }
.callout-success .callout-title { color: var(--success); }
.callout-danger .callout-title { color: var(--danger); }

/* ---- Doc Layout ---- */
.doc-layout { display: grid; grid-template-columns: 260px 1fr; gap: 3rem; }
.doc-sidebar {
  position: sticky; top: 5.5rem; height: fit-content; max-height: calc(100vh - 7rem);
  overflow-y: auto; padding-right: 1rem;
}
.doc-sidebar-group { margin-bottom: 1.5rem; }
.doc-sidebar-group h4 {
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--text-tertiary); margin-bottom: 0.5rem;
  padding: 0.25rem 0.75rem;
}
.doc-sidebar a {
  display: block; padding: 0.375rem 0.75rem; border-radius: 0.375rem;
  font-size: 0.8125rem; color: var(--text-secondary);
  transition: all var(--transition); margin-bottom: 1px;
}
.doc-sidebar a:hover { color: var(--primary); background: var(--surface-hover); }
.doc-sidebar a.active {
  color: var(--primary); background: rgba(99,102,241,0.08); font-weight: 600;
}
[data-theme="enflame"] .doc-sidebar a.active {
  color: var(--primary-dark); background: rgba(245,158,11,0.1);
}
[data-theme="enflame"] .doc-sidebar a:hover { color: var(--primary-dark); }

.doc-content h2 {
  font-size: 1.75rem; font-weight: 800; margin: 2.5rem 0 1rem; padding-top: 1rem;
}
.doc-content h2:first-child { margin-top: 0; }
.doc-content h3 { font-size: 1.25rem; font-weight: 700; margin: 2rem 0 0.75rem; }
.doc-content p { margin-bottom: 1rem; color: var(--text-secondary); }
.doc-content ul, .doc-content ol { margin-bottom: 1rem; padding-left: 1.5rem; }
.doc-content li { margin-bottom: 0.375rem; color: var(--text-secondary); }

/* ---- Page Header (inner pages) ---- */
.page-header {
  padding: 7rem 0 3rem;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(99,102,241,0.08) 0%, transparent 50%),
    var(--surface-alt);
  border-bottom: 1px solid var(--border);
}
[data-theme="enflame"] .page-header {
  background:
    radial-gradient(ellipse at 30% 50%, rgba(245,158,11,0.08) 0%, transparent 50%),
    var(--surface-alt);
}
.page-header h1 { font-size: 2.5rem; font-weight: 800; margin-bottom: 0.75rem; }
.page-header p { font-size: 1.1rem; color: var(--text-secondary); max-width: 600px; }

/* ---- Architecture Diagram ---- */
.diagram-container {
  background: var(--surface-alt); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 2.5rem; margin: 2rem 0;
}
.arch-diagram { display: flex; flex-direction: column; gap: 0.5rem; align-items: center; }
.arch-layer {
  width: 100%; max-width: 600px; padding: 1rem 1.5rem;
  border-radius: var(--radius); text-align: center;
  font-weight: 600; font-size: 0.9rem; transition: all var(--transition);
  border: 1px solid var(--border);
}
.arch-layer:hover { transform: scale(1.03); box-shadow: var(--shadow); }
.arch-layer.layer-api { background: rgba(99,102,241,0.1); color: var(--primary-dark); }
.arch-layer.layer-engine { background: rgba(6,182,212,0.1); color: var(--accent-dark); }
.arch-layer.layer-scheduler { background: rgba(16,185,129,0.1); color: #059669; }
.arch-layer.layer-backend { background: rgba(245,158,11,0.1); color: #b45309; }
.arch-layer.layer-hardware { background: rgba(139,92,246,0.1); color: #7c3aed; }
.arch-arrow { font-size: 1.25rem; color: var(--text-tertiary); line-height: 1; }

/* ---- Community Grid ---- */
.community-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.community-card {
  position: relative; overflow: hidden;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 2rem; text-align: center;
  transition: all var(--transition);
}
.community-card::after {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(200px circle at var(--mouse-x,50%) var(--mouse-y,50%), rgba(99,102,241,0.06), transparent);
  pointer-events: none; opacity: 0; transition: opacity var(--transition);
}
.community-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.community-card:hover::after { opacity: 1; }
.community-icon { font-size: 2.5rem; margin-bottom: 1rem; display: block; }
.community-card h3 { font-size: 1.125rem; font-weight: 700; margin-bottom: 0.5rem; }
.community-card p { font-size: 0.875rem; color: var(--text-secondary); }

/* ---- Search Overlay ---- */
.search-overlay {
  position: fixed; inset: 0; z-index: 2000;
  background: rgba(0,0,0,0.5); backdrop-filter: blur(4px);
  display: none; align-items: flex-start; justify-content: center;
  padding-top: 15vh;
}
.search-overlay.active { display: flex; }
.search-box {
  width: 100%; max-width: 600px; margin: 0 1rem;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-xl); overflow: hidden;
}
.search-input-wrapper {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 1rem 1.25rem; border-bottom: 1px solid var(--border);
}
.search-input-wrapper svg { flex-shrink: 0; color: var(--text-tertiary); }
.search-input {
  flex: 1; border: none; outline: none; background: transparent;
  font-size: 1rem; font-family: inherit; color: var(--text);
}
.search-input::placeholder { color: var(--text-tertiary); }
.search-results { max-height: 400px; overflow-y: auto; }
.search-hint { padding: 1.5rem; text-align: center; color: var(--text-tertiary); font-size: 0.875rem; }
.search-result-item {
  display: block; padding: 0.875rem 1.25rem;
  border-bottom: 1px solid var(--border); transition: background var(--transition);
  text-decoration: none; color: var(--text);
}
.search-result-item:hover { background: var(--surface-hover); }
.search-result-item .search-result-title { font-weight: 600; font-size: 0.9rem; }
.search-result-item .search-result-desc { font-size: 0.8125rem; color: var(--text-secondary); margin-top: 0.125rem; }

/* ---- Footer ---- */
.site-footer {
  background: var(--surface-alt); border-top: 1px solid var(--border); padding: 4rem 0 2rem;
}
[data-theme="dark"] .site-footer { background: #080d1a; }
[data-theme="enflame"] .site-footer { background: #1a1005; border-top-color: #2a1f0a; }
[data-theme="enflame"] .site-footer,
[data-theme="enflame"] .site-footer h4,
[data-theme="enflame"] .site-footer a,
[data-theme="enflame"] .site-footer p,
[data-theme="enflame"] .site-footer .footer-bottom { color: #e8d5b0; }
[data-theme="enflame"] .site-footer a:hover { color: var(--primary-light); }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; margin-bottom: 3rem;
}
.footer-brand .logo { margin-bottom: 1rem; }
.footer-brand p { color: var(--text-secondary); font-size: 0.875rem; max-width: 280px; }
.footer-col h4 { font-size: 0.8125rem; font-weight: 700; margin-bottom: 1rem; text-transform: uppercase; letter-spacing: 0.05em; }
.footer-col a {
  display: block; color: var(--text-secondary); font-size: 0.875rem;
  padding: 0.25rem 0; transition: all var(--transition);
}
.footer-col a:hover { color: var(--primary); transform: translateX(3px); }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap;
  padding-top: 2rem; border-top: 1px solid var(--border);
  font-size: 0.8125rem; color: var(--text-tertiary);
}
.footer-bottom a { color: inherit; transition: color var(--transition); }
.footer-bottom a:hover { color: var(--primary); }

/* ---- Reveal Animation ---- */
.reveal {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ---- Enflame Overrides ---- */
[data-theme="enflame"] .btn-primary {
  background: transparent; color: var(--primary-dark);
  border: 2px solid var(--primary); border-radius: 2rem; box-shadow: none;
}
[data-theme="enflame"] .btn-primary:hover {
  background: var(--primary); color: white;
  box-shadow: 0 4px 20px rgba(245,158,11,0.3);
}
[data-theme="enflame"] .nav-links a:hover,
[data-theme="enflame"] .nav-links a.active { color: var(--primary-dark); }
[data-theme="enflame"] .scroll-progress { background: var(--primary); animation: none; }

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .doc-layout { grid-template-columns: 1fr; }
  .doc-sidebar { position: static; max-height: none; border-bottom: 1px solid var(--border); padding-bottom: 1.5rem; margin-bottom: 2rem; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-code { margin-top: 2rem; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .community-grid { grid-template-columns: repeat(2, 1fr); }
}

.pipeline-flow {
  display: flex; flex-direction: column; gap: 0; padding: 1.5rem 0;
}
.pipeline-stage {
  display: flex; align-items: center; gap: 1.25rem; padding: 1.25rem 1.5rem;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); position: relative;
  opacity: 0; transform: translateX(-30px);
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}
.pipeline-stage.visible {
  opacity: 1; transform: translateX(0);
}
.pipeline-stage:hover {
  border-color: var(--primary); box-shadow: var(--shadow);
  transform: translateX(6px);
}
.pipeline-stage-icon {
  width: 52px; height: 52px; border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; flex-shrink: 0; color: #fff;
  box-shadow: 0 4px 12px rgba(99,102,241,0.25);
}
.pipeline-stage-body { flex: 1; }
.pipeline-stage-body h4 {
  margin: 0 0 0.25rem; font-size: 1rem; color: var(--text);
}
.pipeline-stage-body p {
  margin: 0; font-size: 0.875rem; color: var(--text-secondary); line-height: 1.5;
}
.pipeline-arrow {
  display: flex; justify-content: center; padding: 0.25rem 0;
  color: var(--primary); font-size: 1.25rem;
  animation: pulseArrow 1.5s ease-in-out infinite;
}
@keyframes pulseArrow {
  0%, 100% { opacity: 0.4; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(3px); }
}
.pipeline-stage:nth-child(1)  { transition-delay: 0s; }
.pipeline-stage:nth-child(3)  { transition-delay: 0.08s; }
.pipeline-stage:nth-child(5)  { transition-delay: 0.16s; }
.pipeline-stage:nth-child(7)  { transition-delay: 0.24s; }
.pipeline-stage:nth-child(9)  { transition-delay: 0.32s; }
.pipeline-stage:nth-child(11) { transition-delay: 0.40s; }

/* Video demo */
.demo-wrap { max-width: 900px; margin: 0 auto; }
.demo-video-box {
  position: relative; border-radius: 0.75rem; overflow: hidden;
  background: #000; box-shadow: var(--shadow-lg); line-height: 0;
}
.demo-video-box video {
  width: 100%; display: block; border: none; margin: 0; padding: 0;
  outline: none; background: #000; vertical-align: bottom;
}

/* Downloads section */
.dl-tabs { display: flex; gap: 0.25rem; margin-bottom: 1.25rem; flex-wrap: wrap; }
.dl-tabs button {
  padding: 0.5rem 1rem; border-radius: 0.5rem; font-size: 0.85rem; font-weight: 500;
  color: var(--text-secondary); border: 1px solid transparent; background: none;
  cursor: pointer; transition: 0.2s;
}
.dl-tabs button:hover { color: var(--text); background: var(--surface-hover); }
.dl-tabs button.active {
  color: var(--text); background: var(--surface-hover); border-color: var(--border);
}
.dl-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.875rem;
}
.dl-card {
  display: block; padding: 1.25rem; border-radius: 0.75rem;
  background: var(--glass); border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px); transition: 0.25s; text-decoration: none; color: inherit;
}
.dl-card:hover {
  border-color: var(--primary); transform: translateY(-2px); box-shadow: var(--shadow);
}
.dl-card h4 { font-size: 0.92rem; font-weight: 600; margin-bottom: 0.2rem; color: var(--text); }
.dl-card .dl-desc { font-size: 0.78rem; color: var(--text-secondary); margin-bottom: 0.4rem; }
.dl-card .dl-file {
  display: block; font-size: 0.7rem; font-family: var(--font-mono);
  color: var(--text-tertiary); margin-bottom: 0.6rem;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; opacity: 0.8;
}
.dl-card .dl-action { font-size: 0.8rem; color: var(--primary); font-weight: 500; }
.pip-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 0.625rem; margin-top: 1.25rem;
}
.pip-item {
  padding: 0.625rem 0.875rem; border-radius: 0.5rem; background: var(--code-bg);
  border: 1px solid var(--border); font-family: var(--font-mono); font-size: 0.72rem;
  display: flex; align-items: center; justify-content: space-between; gap: 0.5rem;
  word-break: break-all;
}
.pip-item code { flex: 1; overflow: hidden; text-overflow: ellipsis; color: var(--text); }
.pip-item .copy-btn { flex-shrink: 0; }

@media (max-width: 768px) {
  .nav-links {
    display: none; position: absolute; top: 4rem; left: 0; right: 0;
    flex-direction: column; background: var(--surface);
    border-bottom: 1px solid var(--border); padding: 1rem; gap: 0.25rem;
    box-shadow: var(--shadow-lg);
  }
  .nav-links.mobile-open { display: flex; }
  .mobile-toggle { display: flex; }
  .hero h1 { font-size: 2.25rem; }
  .hero { padding: 6rem 0 3rem; min-height: auto; }
  .section { padding: 3rem 0; }
  .section-header h2 { font-size: 1.75rem; }
  .features-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .stats-row { gap: 1rem; }
  .stat-card { flex: 1; min-width: 100px; }
  .container { padding: 0 1rem; }
  .header-inner { padding: 0 1rem; }
  .page-header h1 { font-size: 1.75rem; }
  .footer-bottom { flex-direction: column; gap: 0.5rem; text-align: center; }
  .dl-grid { grid-template-columns: 1fr; }
  .pip-grid { grid-template-columns: 1fr; }
  .pip-item { font-size: 0.65rem; }
  .hero-buttons { flex-direction: column; }
  .hero-buttons .btn { width: 100%; justify-content: center; text-align: center; }
  .table-wrapper { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .table-wrapper table { min-width: 500px; }
  th, td { padding: 0.5rem 0.625rem; font-size: 0.78rem; }
  .step-item { padding: 1rem 1rem 1rem 3.5rem; }
  .model-families { grid-template-columns: repeat(3, 1fr); gap: 0.5rem; }
  .model-family { padding: 0.6rem; }
}