:root { --bg: #ffffff; --fg: #1d1d1f; --muted: #5f6368; --link: #1a63c9; }
@media (prefers-color-scheme: dark) { :root { --bg: #121212; --fg: #e8e8e8; --muted: #a0a0a0; --link: #7fb0ff; } }
body { background: var(--bg); color: var(--fg); font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif; margin: 0; }
main { max-width: 640px; margin: 0 auto; padding: 48px 16px; }
h1 { font-size: 1.6rem; margin-bottom: 0.25rem; }
h2 { font-size: 1.1rem; margin-top: 2rem; }
p.sub, footer { color: var(--muted); }
a { color: var(--link); }
footer { margin-top: 3rem; font-size: 0.9rem; }