:root { --bg: #ffffff; --fg: #111827; --muted: #4b5563; --line: #e5e7eb; --accent: #1d4ed8; color-scheme: light dark; }
@media (prefers-color-scheme: dark) { :root { --bg: #111827; --fg: #f3f4f6; --muted: #d1d5db; --line: #374151; --accent: #93c5fd; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.65 system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 40px 16px 64px; }
h1 { font-size: 28px; line-height: 1.25; margin: 0 0 6px; }
h2 { font-size: 19px; margin: 32px 0 8px; }
p, li { color: var(--fg); }
.muted { color: var(--muted); font-size: 14px; }
a { color: var(--accent); }
nav { display: flex; gap: 16px; margin-bottom: 28px; font-size: 14px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; border-bottom: 1px solid var(--line); padding: 8px 6px; vertical-align: top; }