:root { --bg: #fafaf9; --fg: #1c1917; --muted: #57534e; --link: #1d4ed8; --rule: #e7e5e4; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #1c1917; --fg: #f5f5f4; --muted: #a8a29e; --link: #93c5fd; --rule: #44403c; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 40rem; margin: 0 auto; padding: 3rem 1rem 4rem; }
h1 { font-size: 1.75rem; line-height: 1.25; margin: 0 0 .5rem; }
h2 { font-size: 1.15rem; margin: 2rem 0 .5rem; }
p, li { color: var(--fg); }
.muted { color: var(--muted); }
a { color: var(--link); }
footer { margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--rule); font-size: .9rem; color: var(--muted); }