/* ==========================================================================
   Vibe Design Reference — Global Tokens + Reset + Typography
   Editorial dark luxury shell. Fraunces (display) + Inter Tight (body)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300..900;1,9..144,300..900&family=Inter+Tight:wght@300..800&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
  /* Palette — warm dark, editorial */
  --bg: #0E0E12;
  --bg-elev: #16161C;
  --bg-card: #1B1B23;
  --bg-hover: #22222C;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #F2EFE7;
  --text-soft: #C9C5BC;
  --text-muted: #8C8A82;
  --text-dim: #5C5A55;

  --accent: #E8B339;      /* warm amber — distinctive vs typical blue */
  --accent-soft: #F3CB6E;
  --accent-2: #D96F5A;    /* sienna coral */
  --accent-3: #6FB5A8;    /* muted teal */

  /* Type */
  --font-display: 'Fraunces', 'Times New Roman', serif;
  --font-body: 'Inter Tight', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', monospace;

  /* Sizing */
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --max-w: 1180px;
  --max-w-narrow: 880px;

  /* Shadow */
  --shadow-soft: 0 8px 30px rgba(0, 0, 0, 0.35);
  --shadow-strong: 0 18px 50px rgba(0, 0, 0, 0.55);
  --glow-accent: 0 0 60px rgba(232, 179, 57, 0.18);

  /* Motion */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
}

[data-theme="light"] {
  --bg: #F6F2E9;
  --bg-elev: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-hover: #EFEADD;
  --border: rgba(0, 0, 0, 0.10);
  --border-strong: rgba(0, 0, 0, 0.22);
  --text: #1A1814;
  --text-soft: #3B3833;
  --text-muted: #6B6862;
  --text-dim: #9C9890;
  --accent: #B8851D;
  --accent-soft: #E8B339;
  --shadow-soft: 0 6px 24px rgba(20, 18, 14, 0.08);
  --shadow-strong: 0 14px 40px rgba(20, 18, 14, 0.16);
  --glow-accent: 0 0 40px rgba(184, 133, 29, 0.16);
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'ss01' on, 'cv11' on;
  min-height: 100vh;
  transition: background 0.35s var(--ease), color 0.35s var(--ease);
}

img, svg, video { display: block; max-width: 100%; height: auto; }
button { font: inherit; cursor: pointer; background: none; border: none; color: inherit; }
input, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

::selection { background: var(--accent); color: var(--bg); }

/* Typography primitives */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--text);
}

.display {
  font-family: var(--font-display);
  font-size: clamp(56px, 9vw, 120px);
  font-weight: 400;
  line-height: 0.95;
  letter-spacing: -0.04em;
}
.display em {
  font-style: italic;
  font-weight: 300;
  color: var(--accent);
}

h1, .h1 { font-size: clamp(40px, 6vw, 72px); font-weight: 400; }
h2, .h2 { font-size: clamp(28px, 3.5vw, 44px); font-weight: 500; }
h3, .h3 { font-size: 22px; font-weight: 600; font-family: var(--font-body); letter-spacing: -0.01em; }
h4, .h4 { font-size: 17px; font-weight: 600; font-family: var(--font-body); letter-spacing: 0; }

p { color: var(--text-soft); }
.lede { font-size: 19px; line-height: 1.55; color: var(--text-soft); max-width: 60ch; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--text-muted);
}

/* Layout primitives */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 28px;
}
.container-narrow {
  width: 100%;
  max-width: var(--max-w-narrow);
  margin: 0 auto;
  padding: 0 28px;
}
@media (max-width: 640px) {
  .container, .container-narrow { padding: 0 20px; }
}

.section { padding: 96px 0; }
.section-sm { padding: 56px 0; }
.section-lg { padding: 140px 0; }
@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .section-lg { padding: 88px 0; }
}

/* Utility */
.muted { color: var(--text-muted); }
.dim { color: var(--text-dim); }
.text-accent { color: var(--accent); }
.italic { font-style: italic; }
.serif { font-family: var(--font-display); }
.mono { font-family: var(--font-mono); }
.center { text-align: center; }

/* Decorative rule */
.rule {
  height: 1px;
  background: var(--border);
  width: 100%;
  border: 0;
}
.rule-accent {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  width: 100%;
  border: 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border-radius: 999px;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: -0.01em;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #1A1300;
  box-shadow: var(--glow-accent);
}
.btn-primary:hover { transform: translateY(-1px); background: var(--accent-soft); }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-ghost:hover { background: var(--bg-hover); border-color: var(--text-muted); }
.btn-link {
  padding: 6px 0;
  color: var(--text-soft);
  border-bottom: 1px solid var(--border);
  border-radius: 0;
}
.btn-link:hover { color: var(--accent); border-color: var(--accent); }

/* Cards (reusable) */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), background 0.25s var(--ease);
}
.card:hover { border-color: var(--border-strong); }

/* Term grid (key terms shared component) */
.term-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 16px;
}
.term-grid > div {
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
}
.term-grid b {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 6px;
  font-weight: 500;
}
.term-grid span {
  font-size: 14px;
  color: var(--text-soft);
  line-height: 1.5;
}
@media (max-width: 640px) {
  .term-grid { grid-template-columns: 1fr; }
}

/* Tip callout */
.tip {
  position: relative;
  padding: 22px 26px 22px 56px;
  background: linear-gradient(180deg, rgba(232, 179, 57, 0.08), rgba(232, 179, 57, 0.02));
  border: 1px solid rgba(232, 179, 57, 0.25);
  border-radius: var(--radius);
  color: var(--text-soft);
  font-size: 15.5px;
  line-height: 1.65;
}
.tip::before {
  content: "✦";
  position: absolute;
  left: 22px;
  top: 22px;
  color: var(--accent);
  font-size: 18px;
}
.tip b { color: var(--text); font-weight: 600; }

/* Numbered badge — used for chapter numbers */
.num-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 6px 12px;
  border: 1px solid rgba(232, 179, 57, 0.4);
  border-radius: 999px;
  background: rgba(232, 179, 57, 0.06);
}

/* Example sites list */
.examples {
  list-style: none;
  padding: 0;
  margin: 16px 0 0 0;
  display: grid;
  gap: 2px;
}
.examples li {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.examples li::before {
  content: "→";
  color: var(--accent);
  font-family: var(--font-mono);
  line-height: 1.5;
}
.examples a {
  font-weight: 500;
  color: var(--text);
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.examples a:hover { color: var(--accent); border-color: var(--accent); }
.examples .desc {
  display: block;
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Demo wrapper — full-bleed area for live demos */
.demo {
  position: relative;
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  min-height: 380px;
}
.demo-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 10;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  background: rgba(0, 0, 0, 0.5);
  color: #fff;
  padding: 6px 10px;
  border-radius: 999px;
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

/* Subtle grain texture overlay (decorative) */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.04;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n'><feTurbulence baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)' opacity='0.65'/></svg>");
}