:root { --bg: #ffffff; --fg: #111827; --muted: #4b5563; --line: #e5e7eb; --link: #2563eb; }
@media (prefers-color-scheme: dark) { :root { --bg: #0b0a10; --fg: #f3f4f6; --muted: #9ca3af; --line: #26242e; --link: #8ab4f8; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.6 -apple-system, "Segoe UI", Arial, sans-serif; }
main { max-width: 680px; margin: 0 auto; padding: 48px 16px 64px; }
h1 { font-size: 28px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 18px; margin: 32px 0 8px; }
p, li { color: var(--fg); }
.lead { color: var(--muted); margin: 0 0 24px; }
a { color: var(--link); }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }