:root { --bg: #fff; --fg: #1a1a1a; --muted: #5a5a5a; --line: #e4e4e4; --accent: #0b5fff; }
@media (prefers-color-scheme: dark) { :root { --bg: #111; --fg: #ececec; --muted: #a3a3a3; --line: #2a2a2a; --accent: #6ea0ff; } }
* { 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; }
header, main, footer { max-width: 720px; margin: 0 auto; padding: 0 16px; }
header { display: flex; justify-content: space-between; align-items: center; padding-top: 24px; padding-bottom: 24px; border-bottom: 1px solid var(--line); }
header a.brand { font-weight: 700; text-decoration: none; color: var(--fg); letter-spacing: .02em; }
nav a { color: var(--muted); text-decoration: none; margin-left: 16px; font-size: 15px; }
nav a:hover, a:hover { color: var(--accent); }
main { padding-top: 32px; padding-bottom: 48px; }
h1 { font-size: 30px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
p, li { color: var(--fg); }
.muted { color: var(--muted); }
a { color: var(--accent); }
footer { border-top: 1px solid var(--line); padding-top: 16px; padding-bottom: 32px; font-size: 14px; color: var(--muted); }
footer a { color: var(--muted); margin-right: 12px; }
ul { padding-left: 20px; }