:root {
  color-scheme: dark;
  --bg: #070a0f;
  --surface: #0d131c;
  --line: #21303c;
  --text: #edf6f5;
  --muted: #95a6b3;
  --accent: #42e8cf;
  --accent2: #55a7ff;
  --ok: #bafc62;
  --warn: #ffc96b;
  --dark: #04110f;
}

html { background: var(--bg); }
body {
  background:
    radial-gradient(circle at 85% 5%, rgba(66,232,207,.08), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.top {
  min-height: 92px;
  margin-top: 12px;
  padding: 0 18px;
  border: 1px solid rgba(149,166,179,.2);
  border-radius: 18px;
  background: rgba(13,19,28,.78);
  box-shadow: 0 14px 45px rgba(0,0,0,.24);
  backdrop-filter: blur(18px);
}
.logo { filter: none; }
.brand span, .brand small, .brand span span { color: var(--muted); }
.nav a, .btn {
  border-color: var(--line);
  border-radius: 9px;
  background: rgba(4,8,13,.6);
  color: var(--text);
}
.nav a:hover, .btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { border-color: var(--accent); background: var(--accent); color: #04110f; }
.btn.primary:hover { border-color: #75f1c8; background: #75f1c8; color: #04110f; }

.hero { gap: 14px; padding-top: 28px; }
.hero-main {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 20px;
  background:
    radial-gradient(circle at 82% 12%, rgba(66,232,207,.16), transparent 34%),
    linear-gradient(rgba(66,232,207,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(66,232,207,.045) 1px, transparent 1px),
    linear-gradient(145deg, #111a25, #090e15);
  background-size: auto, 46px 46px, 46px 46px, auto;
}
h1 { letter-spacing: -.055em; }
h2 { letter-spacing: -.035em; }
.lead, .feature p, .quick p, .card p, .card li, .intro, footer { color: var(--muted); }
.kicker, .meta, .label, .open { color: var(--accent); }

.feature, .quick a, .card, .fact, .metric {
  position: relative;
  overflow: hidden;
  border-color: var(--line);
  border-radius: 16px;
  background: linear-gradient(145deg, rgba(17,26,37,.96), rgba(9,14,21,.94));
}
.feature:before, .quick a:before, .card:before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 88% 7%, rgba(66,232,207,.10), transparent 34%);
  pointer-events: none;
}
.feature > *, .quick a > *, .card > * { position: relative; }
.feature:hover, .quick a:hover, .card:hover {
  border-color: var(--accent);
  box-shadow: 0 20px 48px rgba(0,0,0,.28);
  transform: translateY(-3px);
}
.feature, .quick a, .card { transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease; }
.grid { gap: 14px; }
.band { border-color: var(--line); border-radius: 16px; background: var(--line); }
.metric { border-radius: 0; }
.metric strong { color: var(--accent); }

.toc { position: sticky; top: 104px; z-index: 10; background: rgba(7,10,15,.9); backdrop-filter: blur(14px); }
.toc a { border: 1px solid var(--line); background: var(--surface); color: var(--text); }
.toc a:hover { border-color: var(--accent); color: var(--accent); }
.server { border: 1px solid var(--line); background: #05080d; color: var(--accent); }
.callout { border-color: var(--accent); background: rgba(66,232,207,.07); }
.callout.ok { border-color: var(--ok); background: rgba(186,252,98,.06); }
.callout.warn { border-color: var(--warn); background: rgba(255,201,107,.06); }
.checklist li { border-color: var(--line); }
.checklist li:before { color: var(--ok); }

footer { border-top: 1px solid var(--line); }

@media (max-width: 900px) {
  .top { position: static; margin-top: 10px; padding: 16px; }
  .toc { position: static; }
}

@media (prefers-reduced-motion: reduce) {
  html:focus-within { scroll-behavior: auto; }
  *, *:before, *:after { scroll-behavior: auto !important; transition: none !important; }
}