:root { --bg: #fafafa; --fg: #1d1d1f; --muted: #6e6e73; --link: #0a66c2; }
@media (prefers-color-scheme: dark) { :root { --bg: #111; --fg: #f2f2f2; --muted: #a0a0a5; --link: #6cb4ff; } }
body { background: var(--bg); color: var(--fg); font: 16px/1.6 -apple-system, system-ui, sans-serif; margin: 0; padding: 48px 16px; }
main { max-width: 640px; margin: 0 auto; }
h1 { font-size: 1.6rem; margin: 0 0 4px; } h2 { font-size: 1.1rem; margin-top: 28px; }
p.sub { color: var(--muted); margin: 0 0 24px; } a { color: var(--link); }
footer { margin-top: 40px; color: var(--muted); font-size: .9rem; }