:root {
  color-scheme: dark;
  --bg: #0b0f14;
  --surface: #111821;
  --surface-2: #17212d;
  --text: #e8edf2;
  --muted: #aeb9c5;
  --border: #2b3948;
  --accent: #7bb7ff;
  --good: #8bd5a1;
  --warn: #f2c879;
  --bad: #ff9a9a;
  --code: #0d141d;
  --max: 1460px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.58;
}
a { color: var(--accent); text-decoration-thickness: .08em; text-underline-offset: .18em; }
a:hover { text-decoration-thickness: .13em; }
.shell { max-width: var(--max); margin: 0 auto; padding: 28px 32px 64px; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding-bottom: 18px; border-bottom: 1px solid var(--border); }
.brand { font-weight: 760; letter-spacing: .01em; }
.breadcrumbs { color: var(--muted); font-size: .92rem; }
.hero { padding: 34px 0 22px; }
.hero h1 { margin: 0 0 10px; font-size: clamp(2rem, 4vw, 3.4rem); line-height: 1.06; letter-spacing: -.035em; }
.hero p { max-width: 900px; color: var(--muted); font-size: 1.08rem; }
.meta { display: flex; gap: 10px; flex-wrap: wrap; margin: 18px 0 0; }
.chip { border: 1px solid var(--border); background: var(--surface); border-radius: 999px; padding: 5px 10px; font-size: .85rem; color: var(--muted); }
.chip.approved { color: var(--good); }
.chip.draft { color: var(--warn); }
.grid { display: grid; grid-template-columns: minmax(220px, 310px) minmax(0, 1fr); gap: 34px; align-items: start; }
nav.side { position: sticky; top: 18px; max-height: calc(100vh - 36px); overflow: auto; border: 1px solid var(--border); background: var(--surface); border-radius: 14px; padding: 16px; }
nav.side h2 { font-size: .78rem; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); margin: 0 0 10px; }
nav.side a { display: block; padding: 7px 9px; border-radius: 8px; text-decoration: none; color: var(--text); }
nav.side a:hover { background: var(--surface-2); }
main { min-width: 0; }
section { scroll-margin-top: 18px; }
h2 { margin-top: 2.25rem; font-size: 1.55rem; letter-spacing: -.02em; }
h3 { margin-top: 1.55rem; font-size: 1.16rem; }
p, li { max-width: 960px; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 14px; margin: 18px 0 28px; }
.card { border: 1px solid var(--border); background: var(--surface); border-radius: 14px; padding: 18px; }
.card h3 { margin: 0 0 6px; }
.card p { margin: 0 0 12px; color: var(--muted); }
.card .links { display: flex; gap: 12px; flex-wrap: wrap; font-size: .92rem; }
.callout { border-left: 3px solid var(--accent); background: var(--surface); padding: 14px 16px; border-radius: 8px; margin: 18px 0; }
.callout.warn { border-left-color: var(--warn); }
.callout.good { border-left-color: var(--good); }
pre { overflow: auto; border: 1px solid var(--border); background: var(--code); padding: 16px; border-radius: 12px; line-height: 1.45; }
code { font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; }
table { width: 100%; border-collapse: collapse; margin: 18px 0 28px; font-size: .95rem; }
th, td { border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; padding: 10px 12px; }
th { color: var(--muted); font-weight: 650; }
.footer { margin-top: 56px; padding-top: 18px; border-top: 1px solid var(--border); color: var(--muted); font-size: .88rem; }
.search { width: 100%; border: 1px solid var(--border); background: var(--surface); color: var(--text); border-radius: 10px; padding: 10px 12px; font: inherit; margin: 10px 0 20px; }
.spec-list { display: grid; gap: 10px; }
.spec-row { display: grid; grid-template-columns: minmax(190px, 1fr) 110px 1.7fr auto; gap: 14px; align-items: center; border: 1px solid var(--border); background: var(--surface); border-radius: 12px; padding: 14px; }
.spec-row .purpose { color: var(--muted); }
@media (max-width: 900px) {
  .shell { padding: 20px 18px 48px; }
  .grid { grid-template-columns: 1fr; }
  nav.side { position: static; max-height: none; }
  .spec-row { grid-template-columns: 1fr; }
}
@media print {
  :root { color-scheme: light; --bg: #fff; --surface: #fff; --surface-2: #f5f5f5; --text: #111; --muted: #444; --border: #bbb; --accent: #0645ad; --code: #f7f7f7; }
  nav.side, .search { display: none; }
  .grid { display: block; }
  .shell { max-width: none; padding: 0; }
}