:root { --bg: #ffffff; --fg: #18181b; --muted: #71717a; --line: #e4e4e7; --accent: #0f766e; color-scheme: light dark; }
@media (prefers-color-scheme: dark) { :root { --bg: #0b0b0c; --fg: #f4f4f5; --muted: #a1a1aa; --line: #27272a; --accent: #5eead4; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 56px 16px 80px; }
h1 { font-size: 2rem; line-height: 1.2; 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(--accent); }
nav { display: flex; gap: 20px; margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); font-size: 0.9rem; }
ul { padding-left: 1.2em; }