:root { --bg: #f7f7f5; --card: #ffffff; --ink: #1d1f23; --muted: #5d636e; --line: #e3e4e8; --link: #2f5fd0; }
@media (prefers-color-scheme: dark) { :root { --bg: #15171b; --card: #1d2026; --ink: #e8e9ec; --muted: #a0a6b1; --line: #2c3038; --link: #8fb0ff; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 28px 24px; }
h1 { font-size: 28px; line-height: 1.2; margin: 0 0 4px; }
h2 { font-size: 19px; margin: 28px 0 6px; }
p, li { color: var(--ink); }
.muted { color: var(--muted); font-size: 14px; }
a { color: var(--link); }
ul { padding-left: 22px; }
nav { margin-bottom: 16px; font-size: 14px; }