:root { --fg: #1d1f24; --muted: #5b6070; --bg: #ffffff; --link: #1f5fbf; }
@media (prefers-color-scheme: dark) {
  :root { --fg: #e6e8ee; --muted: #a2a8b8; --bg: #14161b; --link: #7fb0ff; }
}
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
main { max-width: 42rem; margin: 0 auto; padding: 3rem 1rem; }
h1 { font-size: 1.8rem; margin: 0 0 1rem; }
h2 { font-size: 1.15rem; margin: 2rem 0 0.5rem; }
a { color: var(--link); }
code { font-size: 0.9em; color: var(--muted); }