:root { color-scheme: light dark; --fg: #1d1d1f; --muted: #6e6e73; --bg: #fff; --line: #e5e5ea; --link: #0a66d6; }
@media (prefers-color-scheme: dark) { :root { --fg: #f5f5f7; --muted: #a1a1a6; --bg: #000; --line: #2c2c2e; --link: #4aa3ff; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.6 -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 48px 20px 80px; }
h1 { font-size: 32px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 21px; margin: 36px 0 8px; }
p, li { color: var(--fg); }
.muted { color: var(--muted); font-size: 15px; }
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
nav { display: flex; gap: 16px; font-size: 15px; margin-bottom: 32px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 56px 0; }