:root {
  --bg: #fafaf9;
  --fg: #1c1917;
  --muted: #57534e;
  --line: #e7e5e4;
  --link: #1d4ed8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1917;
    --fg: #f5f5f4;
    --muted: #a8a29e;
    --line: #44403c;
    --link: #93c5fd;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 48px 16px 64px; }
h1 { font-size: 1.75rem; margin: 0 0 4px; }
h2 { font-size: 1.1rem; margin: 32px 0 8px; }
.sub { color: var(--muted); margin: 0 0 24px; }
a { color: var(--link); }
ul { padding-left: 20px; }
code { font-size: 0.9em; }
nav { display: flex; gap: 16px; flex-wrap: wrap; padding-bottom: 16px; border-bottom: 1px solid var(--line); margin-bottom: 32px; }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.875rem; }