:root { color-scheme: light dark; --fg: #1d1d1f; --muted: #6e6e73; --bg: #fbfbfd; --accent: #d9734e; }
@media (prefers-color-scheme: dark) { :root { --fg: #f5f5f7; --muted: #a1a1a6; --bg: #111113; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.7 -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif; }
main { max-width: 680px; margin: 0 auto; padding: 56px 24px 72px; }
h1 { font-size: 32px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 19px; margin: 32px 0 8px; }
p, li { color: var(--fg); }
.muted { color: var(--muted); }
a { color: var(--accent); }
nav { display: flex; gap: 20px; margin-top: 40px; font-size: 15px; }