:root { --bg: #ffffff; --fg: #1d1d1f; --muted: #5f6368; --link: #1a56db; --line: #e3e3e3; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #161618; --fg: #ececec; --muted: #a0a0a5; --link: #8ab4f8; --line: #2e2e32; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif; }
main { max-width: 680px; margin: 0 auto; padding: 48px 16px; }
h1 { font-size: 1.8rem; margin: 0 0 8px; }
h2 { font-size: 1.15rem; margin: 32px 0 8px; }
p, li { color: var(--fg); }
.muted { color: var(--muted); }
a { color: var(--link); }
nav { display: flex; gap: 20px; padding-bottom: 16px; margin-bottom: 32px; border-bottom: 1px solid var(--line); }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); font-size: .9rem; color: var(--muted); }