:root { --text: #1a1a1a; --muted: #555; --bg: #fff; --link: #0b57d0; }
@media (prefers-color-scheme: dark) { :root { --text: #e8e8e8; --muted: #aaa; --bg: #121212; --link: #8ab4f8; } }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
main { max-width: 720px; margin: 40px auto; padding: 0 16px; }
a { color: var(--link); }
.muted { color: var(--muted); }
h2 { margin-top: 2em; font-size: 1.15em; }