/* Informational pages (what-is / five-models / faq) — cosmic theme, reading-first. */

:root {
  --bg: #050507;
  --bg-2: oklch(11% 0 0);
  --bg-3: oklch(15% 0 0);
  --fg: #fafafa;
  --fg-2: #c8c8d0;
  --fg-3: #888896;
  --fg-4: #555562;
  --rule: oklch(20% 0 0);
  --rule-2: oklch(28% 0 0);
  --accent: #c5ff3a;
  --accent-deep: oklch(75% .25 130);
  --green: oklch(82% .22 145);
  --red: oklch(72% .22 25);
  --sans: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --read: 760px;
  --radius: 14px;
  --radius-sm: 8px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
strong { font-weight: 600; }
em { font-style: italic; }

/* ─── COSMIC BACKGROUND ──────────────────────────────────────────── */
.cosmos { position: fixed; inset: 0; z-index: 0; pointer-events: none; }
.cosmos-glow { position: absolute; border-radius: 50%; filter: blur(140px); opacity: 0.40; }
.cosmos-glow-1 { top: -10%; left: 25%; width: 60vw; height: 60vw;
  background: radial-gradient(circle, oklch(70% .25 130 / .22), transparent 60%); }
.cosmos-glow-2 { bottom: -20%; right: 10%; width: 50vw; height: 50vw;
  background: radial-gradient(circle, oklch(60% .22 295 / .18), transparent 60%); }
.cosmos-grid { position: absolute; inset: 0;
  background-image: radial-gradient(circle at 50% 50%, oklch(95% 0 0 / .04) 1px, transparent 1.2px);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 90%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 90%); }
body > *:not(.cosmos) { position: relative; z-index: 1; }

/* ─── TOPBAR ─────────────────────────────────────────────────────── */
.bar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; padding: 12px 22px;
  background: rgba(5, 5, 7, 0.78);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--rule);
}
.bar-brand { display: inline-flex; align-items: baseline; gap: 9px; color: var(--fg); }
.bar-mark { color: var(--accent); font-size: 13px; }
.bar-name { font-weight: 700; letter-spacing: 0.14em; font-size: 14px; }
.bar-ver { font-family: var(--mono); font-size: 10px; font-weight: 500;
  background: var(--accent); color: #0a0a10; padding: 1px 5px; border-radius: 4px; }
.bar-nav { display: flex; gap: 22px; font-family: var(--mono); font-size: 11px;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--fg-3); }
.bar-nav a { color: var(--fg-3); }
.bar-nav a:hover, .bar-nav a[aria-current="page"] { color: var(--accent); text-decoration: none; }
@media (max-width: 640px) { .bar-nav { display: none; } }

/* ─── ARTICLE LAYOUT ─────────────────────────────────────────────── */
main { max-width: var(--read); margin: 0 auto; padding: 64px 22px 96px; }
.eyebrow { font-family: var(--mono); font-size: 11px; letter-spacing: 0.26em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 18px; }
h1 { font-size: clamp(32px, 6vw, 52px); line-height: 1.08; letter-spacing: -0.02em;
  font-weight: 700; margin-bottom: 20px; }
.lead { font-size: 19px; color: var(--fg-2); margin-bottom: 36px; max-width: 62ch; }
h2 { font-size: clamp(24px, 4vw, 32px); line-height: 1.15; letter-spacing: -0.01em;
  font-weight: 600; margin: 56px 0 16px; }
h3 { font-size: 19px; font-weight: 600; margin: 32px 0 10px; }
p { color: var(--fg-2); margin-bottom: 18px; }
main ul, main ol { color: var(--fg-2); margin: 0 0 18px 0; padding-left: 22px; }
main li { margin-bottom: 9px; }
main li::marker { color: var(--accent-deep); }

/* Definition / TL;DR box — the primary citable passage */
.keybox {
  border: 1px solid var(--rule-2);
  border-left: 3px solid var(--accent);
  background: linear-gradient(180deg, oklch(13% 0 0 / .85), oklch(8% 0 0 / .6));
  border-radius: var(--radius);
  padding: 24px 26px; margin: 0 0 40px;
}
.keybox-label { font-family: var(--mono); font-size: 10px; letter-spacing: 0.24em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 12px; }
.keybox p { color: var(--fg); font-size: 17px; margin: 0; }
.keybox p + p { margin-top: 12px; }

/* Agent cards (five-models page) */
.agents { display: grid; gap: 18px; margin: 8px 0 32px; }
.agent {
  border: 1px solid var(--rule); border-radius: var(--radius);
  background: linear-gradient(180deg, oklch(11% 0 0 / .8), oklch(7% 0 0 / .8));
  padding: 22px 24px;
}
.agent-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 10px; }
.agent-name { font-size: 20px; font-weight: 700; letter-spacing: -0.01em; }
.agent-tag { font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em;
  color: var(--accent); }
.agent p { margin: 0; }

/* FAQ — native disclosure, crawlable, no JS */
.faq { display: grid; gap: 10px; margin: 8px 0 24px; }
.faq details {
  border: 1px solid var(--rule); border-radius: var(--radius-sm);
  background: oklch(9% 0 0 / .6); padding: 4px 20px;
}
.faq summary { cursor: pointer; list-style: none; font-weight: 600; font-size: 17px;
  padding: 16px 0; display: flex; justify-content: space-between; gap: 14px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; color: var(--accent); font-family: var(--mono); font-size: 20px; line-height: 1; }
.faq details[open] summary::after { content: '–'; }
.faq details[open] summary { border-bottom: 1px solid var(--rule); }
.faq-body { padding: 14px 0 18px; }
.faq-body p { margin: 0; }

/* Disclaimer strip */
.note {
  font-family: var(--mono); font-size: 12px; line-height: 1.7; color: var(--fg-3);
  border-top: 1px solid var(--rule); margin-top: 56px; padding-top: 22px;
}
.note strong { color: var(--fg-2); }

/* Cross-links / next */
.crosslinks { display: grid; gap: 12px; margin: 40px 0 0; }
.crosslink {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  border: 1px solid var(--rule); border-radius: var(--radius); padding: 18px 22px;
  color: var(--fg); transition: border-color .2s;
}
.crosslink:hover { border-color: var(--accent-deep); text-decoration: none; }
.crosslink-txt { font-weight: 600; }
.crosslink-sub { display: block; font-family: var(--mono); font-size: 11px;
  color: var(--fg-3); letter-spacing: 0.04em; margin-top: 4px; font-weight: 400; }
.crosslink-arrow { color: var(--accent); font-size: 18px; }

/* Footer */
.foot { border-top: 1px solid var(--rule); padding: 28px 22px; text-align: center;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; color: var(--fg-4); }
.foot a { color: var(--fg-3); }
.updated { font-family: var(--mono); font-size: 11px; color: var(--fg-4);
  letter-spacing: 0.06em; margin-top: 28px; }