/**
 * rhosocial ActiveRecord — Theme Lab · Core Stylesheet
 * ═══════════════════════════════════════════════════════════════════════
 *
 * This file provides the UNTHEMED foundation:
 *   1. Reset & base typography
 *   2. Default design tokens on :root (gray/white, readable defaults)
 *   3. Structural CSS for every component in the page
 *   4. No colors or fonts hardcoded — everything consumes CSS variables
 *
 * Themes (assets/themes/*.css) override tokens via [data-theme="x"].
 * Font packs (assets/fonts/*.css) override font vars via html[data-font="y"].
 *
 * When adding a new component: define structure here in terms of CSS vars,
 * and each theme file will inherit the styling automatically.
 */

/* ═══════════════════════════════════════════════════════════════
   1 · RESET
   ═══════════════════════════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
  min-height: 100vh;
  transition: background-color 400ms ease, color 400ms ease;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
a { color: inherit; text-decoration: none; }
input, textarea, select { font: inherit; color: inherit; }
kbd {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 1px 6px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg-2);
}

/* ═══════════════════════════════════════════════════════════════
   2 · DEFAULT DESIGN TOKENS (neutral, unthemed)
   These are the VOCABULARY used across all components.
   Themes override these. Font packs override only font vars.
   ═══════════════════════════════════════════════════════════════ */
:root {
  /* Surfaces */
  --bg: #ffffff;
  --bg-2: #F5F5F3;
  --bg-elevated: #ffffff;

  /* Text */
  --fg: #141413;
  --fg-muted: #5E5D57;
  --fg-faint: #929189;

  /* Accents */
  --accent: #4F52D0;
  --accent-2: #1CAF87;
  --accent-3: #EFA827;

  /* Structure */
  --border: rgba(20, 20, 19, 0.10);
  --border-strong: rgba(20, 20, 19, 0.22);
  --radius: 12px;
  --radius-sm: 6px;

  /* Typography */
  --font-display: 'Inter Tight', system-ui, -apple-system, sans-serif;
  --font-body:    'Inter Tight', system-ui, -apple-system, sans-serif;
  --font-mono:    'JetBrains Mono', 'Fira Code', monospace;

  /* Display metrics (set per theme / per font pack) */
  --display-weight:   700;
  --display-tracking: -0.02em;
  --display-leading:  1.05;

  /* Code tokens (defaults) */
  --code-bg:        #0F1117;
  --code-fg:        #E8E6DE;
  --code-fg-muted:  #9B998F;
  --code-border:    rgba(255,255,255,0.08);
  --tok-keyword:    #C9CAFD;
  --tok-string:     #62E0BE;
  --tok-func:       #F2B030;
  --tok-comment:    #62615B;
  --tok-num:        #B3EFD9;
  --tok-op:         #A8A69E;
  --tok-class:      #F9C755;
  --tok-self:       #A4A7F9;
  --tok-dec:        #F2B030;
  --tok-dim:        #62615B;
  --tok-attr:       #A4A7F9;

  /* Semantic component colors */
  --info:    #3B82F6;
  --success: #1CAF87;
  --warn:    #EFA827;
  --danger:  #DC2626;
}

/* ═══════════════════════════════════════════════════════════════
   3 · ENTRANCE ANIMATIONS
   ═══════════════════════════════════════════════════════════════ */
@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes pulse { 0%,100% {opacity:1} 50% {opacity:0.4} }

.rise { animation: rise 700ms cubic-bezier(0.2, 0.7, 0.2, 1) both; }
.rise:nth-child(1) { animation-delay: 50ms; }
.rise:nth-child(2) { animation-delay: 120ms; }
.rise:nth-child(3) { animation-delay: 190ms; }
.rise:nth-child(4) { animation-delay: 260ms; }
.rise:nth-child(5) { animation-delay: 330ms; }
.rise:nth-child(6) { animation-delay: 400ms; }

/* ═══════════════════════════════════════════════════════════════
   4 · CONTROL BAR (fixed top; theme + font switcher)
   ═══════════════════════════════════════════════════════════════ */
.control-bar {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 18px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font-family: var(--font-body);
  flex-wrap: wrap;
}
.control-group { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.control-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-right: 6px;
  white-space: nowrap;
}
.chip {
  padding: 5px 11px;
  font-size: 12px;
  font-weight: 500;
  color: var(--fg-muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  transition: all 150ms ease;
  white-space: nowrap;
}
.chip:hover { color: var(--fg); border-color: var(--border-strong); }
.chip.is-active {
  color: var(--bg);
  background: var(--fg);
  border-color: var(--fg);
}
.control-brand {
  display: flex; align-items: center; gap: 10px;
  font-size: 13px;
  font-weight: 500;
  color: var(--fg);
  letter-spacing: -0.01em;
}
.control-brand .dim { color: var(--fg-faint); font-weight: 400; }

/* Nav links (parallel, touch-friendly) */
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-right: auto;
}
.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--fg-faint);
  text-decoration: none;
  border-radius: 6px;
  transition: background 150ms ease, color 150ms ease;
  min-height: 36px;
  -webkit-tap-highlight-color: transparent;
}
.nav-link:hover {
  background: var(--bg-2);
  color: var(--fg);
  text-decoration: none;
}
.nav-link.is-current {
  color: var(--fg);
  background: var(--bg-2);
  font-weight: 600;
}

/* Brand mark: ρ with subscript AR (matches README) */
.brand-mark {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 400;
  color: var(--accent);
  line-height: 1;
  display: inline;
  letter-spacing: -0.02em;
}
.brand-mark sub {
  font-family: var(--font-mono);
  font-size: 0.48em;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-left: 1px;
  vertical-align: sub;
  bottom: 0.1em;
  opacity: 0.9;
}
.brand-mark.size-lg { font-size: 22px; }
.brand-mark.size-md { font-size: 18px; }
.brand-mark.size-sm { font-size: 16px; }

/* ═══════════════════════════════════════════════════════════════
   5 · LAYOUT PRIMITIVES
   ═══════════════════════════════════════════════════════════════ */
.page { padding-top: 70px; }
.section { padding: clamp(48px, 8vw, 120px) clamp(20px, 5vw, 80px); }
.container { max-width: 1200px; margin: 0 auto; }
.container-narrow { max-width: 820px; margin: 0 auto; }

/* Section header */
.section-header { margin-bottom: clamp(40px, 6vw, 72px); }
.section-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 14px;
}
.section-title {
  font-family: var(--font-display);
  font-weight: var(--display-weight);
  letter-spacing: var(--display-tracking);
  line-height: 1.1;
  font-size: clamp(32px, 5vw, 56px);
  color: var(--fg);
  max-width: 22ch;
}
.section-title em { font-style: italic; color: var(--accent); }
.section-intro {
  margin-top: 16px;
  font-size: clamp(15px, 1.2vw, 18px);
  line-height: 1.6;
  color: var(--fg-muted);
  max-width: 62ch;
}
.section-intro code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 1px 5px;
  background: var(--bg-2);
  border-radius: 3px;
  color: var(--fg);
}

/* ═══════════════════════════════════════════════════════════════
   6 · HERO
   ═══════════════════════════════════════════════════════════════ */
.hero {
  position: relative;
  padding-top: clamp(80px, 12vw, 160px);
  padding-bottom: clamp(60px, 10vw, 120px);
}
.hero-inner { position: relative; z-index: 2; }
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
  padding: 4px 12px;
  border: 1px solid currentColor;
  border-radius: 999px;
}
.hero-eyebrow::before {
  content: '';
  width: 6px; height: 6px;
  background: currentColor;
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}
.hero-title {
  font-family: var(--font-display);
  font-weight: var(--display-weight);
  letter-spacing: var(--display-tracking);
  line-height: var(--display-leading);
  font-size: clamp(44px, 8vw, 104px);
  color: var(--fg);
  margin-bottom: 28px;
  max-width: 14ch;
}
.hero-title em { font-style: italic; color: var(--accent); font-family: var(--font-display); }
.hero-sub {
  font-size: clamp(17px, 1.4vw, 21px);
  line-height: 1.55;
  color: var(--fg-muted);
  max-width: 60ch;
  margin-bottom: 40px;
}
.hero-sub strong { color: var(--fg); font-weight: 600; }
.hero-sub code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 1px 5px;
  background: var(--bg-2);
  border-radius: 3px;
  color: var(--fg);
}
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; }

/* ═══════════════════════════════════════════════════════════════
   7 · BUTTONS
   ═══════════════════════════════════════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 22px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all 160ms ease;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn-primary { background: var(--fg); color: var(--bg); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(0,0,0,0.15); }
.btn-ghost { border-color: var(--border-strong); color: var(--fg); }
.btn-ghost:hover { background: var(--bg-2); }
.btn-sm { padding: 7px 14px; font-size: 12px; }
.btn-lg { padding: 16px 28px; font-size: 15px; }
.btn-danger { background: var(--danger); color: #fff; }
.btn[disabled] { opacity: 0.4; cursor: not-allowed; }

/* ═══════════════════════════════════════════════════════════════
   8 · FEATURE CARDS
   ═══════════════════════════════════════════════════════════════ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}
.feature {
  position: relative;
  padding: 28px 26px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
}
.feature:hover { transform: translateY(-2px); border-color: var(--accent); }
.feature-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-faint);
  letter-spacing: 0.1em;
  margin-bottom: 18px;
}
.feature-icon {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  color: var(--accent);
  margin-bottom: 18px;
}
.feature-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--fg);
  margin-bottom: 10px;
  line-height: 1.2;
}
.feature-title em { color: var(--accent); font-style: italic; }
.feature-desc { font-size: 14px; line-height: 1.55; color: var(--fg-muted); }
.feature-desc code {
  font-family: var(--font-mono); font-size: 0.85em;
  padding: 1px 5px; background: var(--bg-2);
  border-radius: 3px; color: var(--fg);
}
.feature-tag {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 3px 8px;
  background: var(--bg-2);
  border-radius: 4px;
  color: var(--fg-muted);
}

/* ═══════════════════════════════════════════════════════════════
   9 · CODE BLOCK
   ═══════════════════════════════════════════════════════════════ */
.code-block {
  position: relative;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: var(--radius);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--code-fg);
}
.code-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--code-border);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--code-fg-muted);
}
.code-dots { display: flex; gap: 6px; }
.code-dots span { width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,0.14); }
.code-filename { font-family: var(--font-mono); }
.code-badge {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 8px;
  border: 1px solid var(--code-border);
  border-radius: 3px;
  color: var(--code-fg-muted);
}
.code-body { padding: 18px 22px 22px; overflow-x: auto; }
.code-body pre { white-space: pre; }

/* Syntax tokens (all consume CSS vars so themes can recolor) */
.tok-k   { color: var(--tok-keyword); font-weight: 500; }
.tok-s   { color: var(--tok-string); }
.tok-f   { color: var(--tok-func); }
.tok-c   { color: var(--tok-comment); font-style: italic; }
.tok-n   { color: var(--tok-num); }
.tok-o   { color: var(--tok-op); }
.tok-cls { color: var(--tok-class); font-weight: 500; }
.tok-self{ color: var(--tok-self); font-style: italic; }
.tok-dec { color: var(--tok-dec); }
.tok-dim { color: var(--tok-dim); }
.tok-attr{ color: var(--tok-attr); }

/* ═══════════════════════════════════════════════════════════════════════
   Light Theme Code Block Overrides
   Use light background for code blocks on light themes for better contrast
   ═══════════════════════════════════════════════════════════════════════ */
[data-theme="editorial"] .code-block,
[data-theme="brutalist"] .code-block,
[data-theme="sumi"] .code-block,
[data-theme="mocha"] .code-block,
[data-theme="anderson"] .code-block,
[data-theme="memphis"] .code-block,
[data-theme="frutiger"] .code-block,
[data-theme="glassmorphism"] .code-block,
[data-theme="wireframe"] .code-block,
[data-theme="newsprint"] .code-block,
[data-theme="parchment"] .code-block,
[data-theme="nordic"] .code-block,
[data-theme="riso"] .code-block,
[data-theme="candy"] .code-block,
[data-theme="solarpunk"] .code-block {
  --code-bg:        #FAFAFA;
  --code-fg:        #1a1a1a;
  --code-fg-muted:  #666666;
  --code-border:    rgba(0,0,0,0.08);
  --tok-keyword:    #D93636;
  --tok-string:     #1A7F37;
  --tok-func:       #0969DA;
  --tok-comment:    #6E7781;
  --tok-num:        #CF5C00;
  --tok-class:      #A04100;
  --tok-self:       #8250DF;
  --tok-dec:        #116FEA;
  --tok-dim:        #6E7781;
  --tok-attr:       #8250DF;
  background: var(--code-bg);
  color: var(--code-fg);
  border-color: var(--code-border);
}

/* Install command (always dark bg for contrast) */
[data-theme="editorial"] .install-cmd,
[data-theme="brutalist"] .install-cmd,
[data-theme="sumi"] .install-cmd,
[data-theme="mocha"] .install-cmd,
[data-theme="anderson"] .install-cmd,
[data-theme="memphis"] .install-cmd,
[data-theme="frutiger"] .install-cmd,
[data-theme="glassmorphism"] .install-cmd,
[data-theme="wireframe"] .install-cmd,
[data-theme="newsprint"] .install-cmd,
[data-theme="parchment"] .install-cmd,
[data-theme="nordic"] .install-cmd,
[data-theme="riso"] .install-cmd,
[data-theme="candy"] .install-cmd,
[data-theme="solarpunk"] .install-cmd {
  --code-bg:        #1a1a1a;
  --code-fg:        #f5f5f5;
  --code-fg-muted:  #999999;
  --tok-keyword:    #FF7066;
  --tok-string:     #8CE0A3;
  --tok-func:       #6B9BFF;
  --tok-comment:    #808080;
  --tok-num:        #FFC077;
  --tok-class:      #FFD966;
  --tok-self:       #CCCCCC;
  --tok-dec:        #FF9966;
  --tok-dim:        #808080;
  --tok-attr:       #CCCCCC;
}

/* ═══════════════════════════════════════════════════════════════
   10 · TABS (used for Python version selector & anywhere else)
   ═══════════════════════════════════════════════════════════════ */
.tabs { display: flex; flex-direction: column; gap: 16px; }
.tabs-list {
  display: flex;
  gap: 2px;
  padding: 4px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow-x: auto;
  scrollbar-width: none;
}
.tabs-list::-webkit-scrollbar { display: none; }
.tab {
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--fg-muted);
  border-radius: calc(var(--radius-sm) - 2px);
  transition: all 150ms ease;
  white-space: nowrap;
}
.tab:hover { color: var(--fg); background: var(--bg-elevated); }
.tab.is-active {
  color: var(--fg);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}
.tab-panel { display: none; }
.tab-panel.is-active { display: block; animation: rise 300ms ease-out; }

/* ═══════════════════════════════════════════════════════════════
   11 · SHOWCASE (In-Practice split layout)
   ═══════════════════════════════════════════════════════════════ */
.showcase {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: start;
}
@media (min-width: 900px) { .showcase { grid-template-columns: 0.7fr 1fr; gap: 56px; } }
.showcase-text .section-title { max-width: 16ch; }
.showcase-points {
  margin-top: 24px;
  display: flex; flex-direction: column; gap: 14px;
}
.showcase-point {
  display: flex; gap: 12px;
  padding: 14px 0;
  border-top: 1px solid var(--border);
  font-size: 14px;
  line-height: 1.55;
}
.showcase-point-num {
  font-family: var(--font-mono);
  color: var(--accent);
  font-weight: 600;
  min-width: 32px;
}
.showcase-point-text { color: var(--fg); }
.showcase-point-text b { font-weight: 600; }
.showcase-point-text code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 1px 5px;
  background: var(--bg-2);
  border-radius: 3px;
}

/* ═══════════════════════════════════════════════════════════════
   12 · STATS GRID
   ═══════════════════════════════════════════════════════════════ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 4px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--border);
}
.stat { background: var(--bg-elevated); padding: 36px 28px; text-align: left; }
.stat-num {
  font-family: var(--font-display);
  font-weight: var(--display-weight);
  letter-spacing: var(--display-tracking);
  font-size: clamp(40px, 5vw, 64px);
  line-height: 1;
  color: var(--fg);
  margin-bottom: 10px;
}
.stat-num .unit { font-size: 0.45em; color: var(--fg-muted); margin-left: 4px; font-weight: 500; }
.stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
}

/* ═══════════════════════════════════════════════════════════════
   13 · COMPONENT GALLERY
   (Buttons / Forms / Alerts / Badges / Table / Progress)
   ═══════════════════════════════════════════════════════════════ */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}
.gallery-card {
  padding: 24px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.gallery-card-title {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 16px;
}

.demo-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}
.demo-stack { display: flex; flex-direction: column; gap: 10px; }

/* Form controls */
.input-group { display: flex; flex-direction: column; gap: 6px; }
.input-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--fg-muted);
  letter-spacing: 0.02em;
}
.input {
  width: 100%;
  padding: 9px 12px;
  font-size: 13px;
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  transition: border-color 150ms ease, box-shadow 150ms ease;
}
.input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent);
}
.input::placeholder { color: var(--fg-faint); }
textarea.input { resize: vertical; min-height: 70px; font-family: var(--font-body); }

/* Select (native styled) */
.select {
  appearance: none;
  background: var(--bg)
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='none' stroke='%23888' stroke-width='1.5' d='m3 5 3 3 3-3'/%3E%3C/svg%3E")
    no-repeat right 10px center;
  padding-right: 28px;
}

/* Checkbox (custom styled) */
.check {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--fg);
  cursor: pointer;
}
.check input { appearance: none; width: 0; height: 0; position: absolute; opacity: 0; }
.check-box {
  width: 16px; height: 16px;
  border: 1.5px solid var(--border-strong);
  border-radius: 3px;
  background: var(--bg);
  transition: all 150ms ease;
  position: relative;
  flex-shrink: 0;
}
.check input:checked + .check-box {
  background: var(--accent);
  border-color: var(--accent);
}
.check input:checked + .check-box::after {
  content: '';
  position: absolute;
  top: 2px; left: 5px;
  width: 4px; height: 8px;
  border: solid var(--bg);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* Toggle / Switch */
.switch { display: inline-flex; align-items: center; gap: 10px; font-size: 13px; cursor: pointer; }
.switch input { appearance: none; width: 0; height: 0; position: absolute; opacity: 0; }
.switch-track {
  width: 34px; height: 20px;
  background: var(--border-strong);
  border-radius: 999px;
  position: relative;
  transition: background 200ms ease;
  flex-shrink: 0;
}
.switch-track::after {
  content: '';
  position: absolute;
  top: 2px; left: 2px;
  width: 16px; height: 16px;
  background: var(--bg);
  border-radius: 50%;
  transition: transform 200ms cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}
.switch input:checked + .switch-track { background: var(--accent); }
.switch input:checked + .switch-track::after { transform: translateX(14px); }

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: 999px;
  border: 1px solid currentColor;
}
.badge-info    { color: var(--info); }
.badge-success { color: var(--success); }
.badge-warn    { color: var(--warn); }
.badge-danger  { color: var(--danger); }
.badge-neutral { color: var(--fg-muted); }

/* Alerts / Callouts */
.alert {
  display: flex;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-left-width: 3px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  line-height: 1.5;
  background: var(--bg-elevated);
}
.alert-icon { flex-shrink: 0; width: 18px; height: 18px; margin-top: 1px; }
.alert-body { color: var(--fg); }
.alert-body b { font-weight: 600; }
.alert-info    { border-left-color: var(--info);    }
.alert-info    .alert-icon { color: var(--info); }
.alert-success { border-left-color: var(--success); }
.alert-success .alert-icon { color: var(--success); }
.alert-warn    { border-left-color: var(--warn);    }
.alert-warn    .alert-icon { color: var(--warn); }
.alert-danger  { border-left-color: var(--danger);  }
.alert-danger  .alert-icon { color: var(--danger); }

/* Data table */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.data-table th, .data-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.data-table th {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.data-table tbody tr:hover { background: var(--bg-2); }
.data-table code {
  font-family: var(--font-mono); font-size: 0.9em;
  color: var(--accent);
}

/* Progress bar */
.progress {
  width: 100%;
  height: 6px;
  background: var(--bg-2);
  border-radius: 999px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: inherit;
  transition: width 400ms ease;
}

/* Kbd pills (for docs) */
.kbd {
  display: inline-block;
  padding: 1px 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-muted);
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--bg-elevated);
}

/* ═══════════════════════════════════════════════════════════════
   14 · INSTALL / CTA
   ═══════════════════════════════════════════════════════════════ */
.install-wrap {
  padding: clamp(48px, 8vw, 88px) clamp(24px, 6vw, 72px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  position: relative;
  overflow: hidden;
}
.install-title {
  font-family: var(--font-display);
  font-weight: var(--display-weight);
  letter-spacing: var(--display-tracking);
  line-height: 1.1;
  font-size: clamp(32px, 4.5vw, 52px);
  color: var(--fg);
  max-width: 18ch;
  margin-bottom: 16px;
}
.install-title em { font-style: italic; color: var(--accent); }
.install-sub {
  font-size: 16px;
  color: var(--fg-muted);
  margin-bottom: 32px;
  max-width: 55ch;
}
.install-cmd {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  padding: 16px 22px;
  background: var(--code-bg);
  color: var(--code-fg);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 15px;
  flex-wrap: wrap;
}
.install-cmd .prompt { color: var(--accent); }
.install-cmd .copy-btn {
  margin-left: 8px;
  padding: 4px 10px;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--code-fg-muted);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 4px;
  transition: all 150ms;
  background: none;
  cursor: pointer;
}
.install-cmd .copy-btn:hover { background: rgba(255,255,255,0.08); color: #fff; }

/* ═══════════════════════════════════════════════════════════════
   15 · FOOTER
   ═══════════════════════════════════════════════════════════════ */
.footer {
  padding: 40px clamp(20px, 5vw, 80px);
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

/* ═══════════════════════════════════════════════════════════════
   16 · RESPONSIVE
   ═══════════════════════════════════════════════════════════════ */
@media (max-width: 640px) {
  .hero-title { font-size: 44px; }
  .section-title { font-size: 30px; }
  .control-bar { gap: 6px; padding: 8px 12px; flex-wrap: wrap; }
  .control-label { display: none; }
  .chip { padding: 4px 9px; font-size: 11px; }
  .control-brand { width: 100%; order: -1; font-size: 12px; }
  .nav-links { order: 0; width: 100%; overflow-x: auto; gap: 2px; }
  .nav-link { padding: 6px 10px; font-size: 12px; min-height: 32px; white-space: nowrap; }
}