/* Structora.ai — design tokens & base */
@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,300..700&family=Instrument+Serif:ital@0;1&family=JetBrains+Mono:wght@400;500&family=Geist:wght@300;400;500;600;700&display=swap');

:root {
  /* Palette — warm editorial ink */
  --paper: #f5f1ea;
  --paper-2: #ece6db;
  --paper-3: #ddd4c4;
  --ink: #16130f;
  --ink-2: #2a2520;
  --ink-3: #5b524a;
  --ink-4: #8a7f72;
  --rule: #d6cdbd;
  --rule-soft: #e3dccd;
  --accent: #b54420;       /* burnt sienna */
  --accent-2: #8a3217;
  --accent-soft: #efd9cd;
  --positive: #2f6b3a;
  --warn: #b07a1f;
  --code-bg: #14110d;
  --code-ink: #e8e0d0;
  --code-green: #9bbf7a;
  --code-blue: #7fb0c8;
  --code-amber: #d6a85a;
  --code-mauve: #b89bb8;

  /* Type */
  --serif: "Fraunces", "Times New Roman", serif;
  --serif-display: "Instrument Serif", "Fraunces", serif;
  --sans: "Geist", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Scale */
  --container: 1280px;
  --container-narrow: 980px;
  --gutter: clamp(20px, 4vw, 56px);

  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 14px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-size: 16px;
  line-height: 1.55;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

::selection { background: var(--ink); color: var(--paper); }

/* Layout */
.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); }
.container-narrow { max-width: var(--container-narrow); margin: 0 auto; padding: 0 var(--gutter); }

.eyebrow {
  font-family: var(--mono);
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-3);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

.h-display {
  font-family: var(--serif-display);
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.02;
  font-size: clamp(48px, 7.5vw, 112px);
  color: var(--ink);
  margin: 0;
}
.h-display em {
  font-style: italic;
  font-family: var(--serif-display);
  color: var(--ink-2);
}
.h1 {
  font-family: var(--serif-display);
  font-weight: 400;
  font-size: clamp(40px, 5.4vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.012em;
  margin: 0;
}
.h2 {
  font-family: var(--serif-display);
  font-weight: 400;
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0;
}
.h3 {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 20px;
  line-height: 1.3;
  letter-spacing: -0.005em;
  margin: 0;
}
.lede {
  font-family: var(--sans);
  font-size: clamp(17px, 1.4vw, 20px);
  line-height: 1.5;
  color: var(--ink-3);
  max-width: 56ch;
  margin: 0;
}
.body { font-size: 16px; line-height: 1.6; color: var(--ink-2); }
.small { font-size: 13px; color: var(--ink-3); }
.mono { font-family: var(--mono); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  font-family: var(--sans);
  font-weight: 500;
  font-size: 14.5px;
  letter-spacing: -0.005em;
  transition: transform .15s ease, background .15s ease, color .15s ease, border-color .15s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--accent-2); }
.btn-ghost { color: var(--ink); border-color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); }
.btn-link {
  height: auto; padding: 0; border-radius: 0;
  border-bottom: 1px solid currentColor;
  border-radius: 0;
  background: none; color: var(--ink);
}
.btn .arr { transition: transform .2s ease; }
.btn:hover .arr { transform: translateX(3px); }

/* Pills / badges */
.pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px;
  font-family: var(--mono);
  font-size: 11px; letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink-3);
}

/* Rules / dividers */
.rule { height: 1px; background: var(--rule); border: 0; margin: 0; }

/* Top nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--paper) 86%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule-soft);
}
.nav-inner {
  display: flex; align-items: center; gap: 32px;
  height: 64px;
}
.brand {
  display: inline-flex; align-items: baseline; gap: 2px;
  font-family: var(--serif-display);
  font-size: 22px;
  letter-spacing: -0.01em;
}
.brand .dot { color: var(--accent); }
.brand .ai { font-family: var(--mono); font-size: 12px; color: var(--ink-3); margin-left: 2px; transform: translateY(-2px); display: inline-block; }
.nav-links { display: flex; gap: 24px; align-items: center; flex: 1; }
.nav-links a {
  font-size: 14px; color: var(--ink-2); padding: 6px 2px; position: relative;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 1px; background: var(--ink);
}
.nav-cta { display: flex; gap: 10px; align-items: center; }

/* Footer */
.footer {
  border-top: 1px solid var(--rule);
  padding: 80px 0 40px;
  background: var(--paper);
  margin-top: 120px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
  gap: 40px;
}
.footer-col h4 {
  font-family: var(--mono);
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-4);
  margin: 0 0 16px 0;
  font-weight: 500;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-col a { color: var(--ink-2); font-size: 14px; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  border-top: 1px solid var(--rule-soft);
  margin-top: 64px; padding-top: 24px;
  font-size: 12.5px; color: var(--ink-4);
  font-family: var(--mono);
}

/* Cards / surfaces */
.surface {
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}
.surface-ink {
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius);
}

/* Section */
section { padding: clamp(64px, 9vw, 120px) 0; }
.section-head {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 64px;
  align-items: end;
  margin-bottom: 56px;
}
.section-head .meta { display: flex; flex-direction: column; gap: 12px; }
@media (max-width: 760px) {
  .section-head { grid-template-columns: 1fr; gap: 16px; align-items: start; }
  .nav-links { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* Schema demo (used in many places) */
.doc-pane { background: #fff; border: 1px solid var(--rule); border-radius: var(--radius); padding: 22px; font-family: var(--serif); font-size: 14px; line-height: 1.55; color: var(--ink-2); position: relative; overflow: hidden; }
.doc-pane h5 { font-family: var(--serif); font-weight: 600; font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase; margin: 0 0 8px; color: var(--ink); }
.doc-pane .ph { display: block; height: 8px; background: var(--rule-soft); border-radius: 2px; margin: 6px 0; }
.doc-pane .ph.short { width: 60%; }
.doc-pane .ph.med { width: 82%; }
.doc-pane mark.hl { background: var(--accent-soft); padding: 1px 3px; border-radius: 2px; color: var(--ink); }

.json-pane {
  background: var(--code-bg); color: var(--code-ink);
  border-radius: var(--radius);
  padding: 22px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.7;
  overflow: auto;
}
.json-pane .k { color: var(--code-blue); }
.json-pane .s { color: var(--code-green); }
.json-pane .n { color: var(--code-amber); }
.json-pane .b { color: var(--code-mauve); }
.json-pane .c { color: #6b6256; }

/* Marquee/tape */
.tape {
  background: var(--ink); color: var(--paper);
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.18em; text-transform: uppercase;
  padding: 12px 0; overflow: hidden; white-space: nowrap;
}
.tape-track { display: inline-flex; gap: 48px; animation: tape 40s linear infinite; padding-left: 48px; }
.tape span { display: inline-flex; align-items: center; gap: 16px; }
.tape span::after { content: "✦"; color: var(--accent); margin-left: 32px; }
@keyframes tape { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* Hover lift */
.lift { transition: transform .25s ease, box-shadow .25s ease; }
.lift:hover { transform: translateY(-2px); }

/* Utility */
.flex { display: flex; }
.between { justify-content: space-between; }
.center { align-items: center; }
.stack-8 { display: flex; flex-direction: column; gap: 8px; }
.stack-12 { display: flex; flex-direction: column; gap: 12px; }
.stack-16 { display: flex; flex-direction: column; gap: 16px; }
.stack-24 { display: flex; flex-direction: column; gap: 24px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
@media (max-width: 880px) {
  .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
}