:root { --bg: #ffffff; --fg: #1d1d1f; --muted: #6e6e73; --link: #0a66c2; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #121214; --fg: #ececf0; --muted: #a1a1a8; --link: #6cb4ff; }
}
body { margin: 0; background: var(--bg); color: var(--fg);
       font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 1.6rem; line-height: 1.25; }
h2 { font-size: 1.1rem; margin-top: 2rem; }
a { color: var(--link); }
code { font-size: .95em; }
.meta { color: var(--muted); font-size: .9rem; }