:root {
  color-scheme: dark;
  --bg: #07090b;
  --panel: #101419;
  --line: #26313a;
  --text: #f3f6f8;
  --muted: #9aa8b3;
  --signal: #80ffb5;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 85% -5%, rgba(128, 255, 181, 0.1), transparent 28rem),
    var(--bg);
  color: var(--text);
}

a { color: inherit; }

.shell {
  width: min(100% - 40px, 860px);
  margin: 0 auto;
  padding: 84px 0 48px;
}

.hero { padding-bottom: 54px; border-bottom: 1px solid var(--line); }
.hero.compact { padding: 30px 0 42px; }

.eyebrow {
  margin: 0 0 22px;
  color: var(--signal);
  font: 650 0.72rem/1.2 ui-monospace, "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.18em;
}

h1 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(2.8rem, 9vw, 6.4rem);
  font-weight: 620;
  letter-spacing: -0.07em;
  line-height: 0.92;
}

.document h1 { font-size: clamp(2.5rem, 7vw, 5rem); }

.lede {
  max-width: 650px;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.8;
}

.cards { display: grid; gap: 12px; padding: 28px 0 52px; }

.card {
  display: grid;
  grid-template-columns: 48px 1fr auto;
  align-items: center;
  gap: 18px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: color-mix(in srgb, var(--panel) 90%, transparent);
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease;
}

.card:hover { border-color: var(--signal); transform: translateY(-2px); }
.card strong { display: block; font-size: 1.08rem; }
.card small { display: block; margin-top: 7px; color: var(--muted); }
.index { color: var(--signal); font: 600 0.75rem ui-monospace, monospace; }

.back {
  display: inline-block;
  color: var(--muted);
  font: 600 0.78rem ui-monospace, monospace;
  text-decoration: none;
}

.document section { padding: 36px 0; border-bottom: 1px solid var(--line); }
.document h2 { margin: 0 0 16px; font-size: 1.12rem; letter-spacing: -0.02em; }
.document p, .document li { color: #c7d0d7; line-height: 1.9; }
.document p { margin: 0 0 14px; }
.document ul { margin: 0; padding-left: 1.25rem; }
.document li + li { margin-top: 10px; }
.document strong { color: var(--text); }
.document section a { text-decoration-color: var(--signal); text-underline-offset: 4px; }

footer { color: var(--muted); font-size: 0.8rem; }

@media (max-width: 560px) {
  .shell { width: min(100% - 28px, 860px); padding-top: 48px; }
  .card { grid-template-columns: 34px 1fr auto; padding: 20px 16px; gap: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  .card { transition: none; }
}