:root { --bg: #f5f5f7; --card: #fff; --text: #1d1d1f; --muted: #6e6e73; --accent: #0066cc; color-scheme: light dark; }
@media (prefers-color-scheme: dark) { :root { --bg: #000; --card: #1c1c1e; --text: #f5f5f7; --muted: #a1a1a6; --accent: #2997ff; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.7 -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 48px 16px 64px; }
h1 { font-size: 32px; line-height: 1.25; margin: 0 0 4px; }
h2 { font-size: 20px; margin: 0 0 8px; }
.sub { color: var(--muted); margin: 0 0 32px; }
section { background: var(--card); border-radius: 16px; padding: 20px 24px; margin-bottom: 16px; }
section p, section ul { margin: 0; }
section ul { padding-left: 1.2em; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
footer { color: var(--muted); font-size: 14px; text-align: center; margin-top: 32px; }