:root { color-scheme: light dark; --fg: #1d1d1f; --muted: #6e6e73; --bg: #fbfbfd; --accent: #0071e3; }
@media (prefers-color-scheme: dark) { :root { --fg: #f5f5f7; --muted: #a1a1a6; --bg: #000; --accent: #2997ff; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif; }
main { max-width: 680px; margin: 0 auto; padding: 48px 16px 96px; }
h1 { font-size: 40px; line-height: 1.1; margin: 0 0 12px; letter-spacing: -0.02em; }
h2 { font-size: 22px; margin: 36px 0 8px; }
p, li { color: var(--fg); }
.muted { color: var(--muted); }
a { color: var(--accent); }
nav { display: flex; gap: 20px; margin-bottom: 40px; font-size: 15px; }
nav a { text-decoration: none; }