:root { color-scheme: light dark; --text: #1d1d1f; --muted: #6e6e73; --bg: #ffffff; --accent: #0071e3; }
@media (prefers-color-scheme: dark) { :root { --text: #f5f5f7; --muted: #a1a1a6; --bg: #000000; --accent: #2997ff; } }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif; }
main { max-width: 680px; margin: 0 auto; padding: 48px 16px 64px; }
h1 { font-size: 2.2em; margin: 0 0 4px; }
h2 { margin-top: 2em; }
.subtitle, footer { color: var(--muted); }
a { color: var(--accent); }
footer { margin-top: 3em; font-size: 0.9em; }