:root { --bg: #ffffff; --fg: #1a1a1a; --muted: #5c5c5c; --line: #e4e4e4; --link: #1f5fbf; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #121212; --fg: #ececec; --muted: #a8a8a8; --line: #2c2c2c; --link: #7fb0ff; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 48px 16px 64px; }
header { border-bottom: 1px solid var(--line); padding-bottom: 16px; margin-bottom: 32px; }
header a.brand { color: var(--fg); text-decoration: none; font-weight: 700; font-size: 18px; }
nav { margin-top: 8px; display: flex; gap: 16px; flex-wrap: wrap; }
a { color: var(--link); }
h1 { font-size: 28px; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
p, li { color: var(--fg); }
.muted { color: var(--muted); font-size: 14px; }
footer { border-top: 1px solid var(--line); margin-top: 48px; padding-top: 16px; font-size: 14px; color: var(--muted); }