:root { --fg: #1a1a1a; --muted: #555; --bg: #fff; --line: #e5e5e5; --link: #0b57d0; }
@media (prefers-color-scheme: dark) {
  :root { --fg: #ececec; --muted: #a8a8a8; --bg: #121212; --line: #2a2a2a; --link: #8ab4f8; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 48px 16px 80px; }
h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 1.2rem; margin: 36px 0 8px; padding-top: 12px; border-top: 1px solid var(--line); }
p, li { color: var(--fg); } .muted { color: var(--muted); font-size: .95rem; }
a { color: var(--link); } ul { padding-left: 1.2rem; }
footer { margin-top: 56px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; }
nav a { margin-right: 16px; }