:root{color-scheme:light dark;--bg:#f6f5f2;--card:#fff;--text:#1f2328;--muted:#5f6670;--line:#d9d7d2;--accent:#1f5f8b}
@media (prefers-color-scheme:dark){:root{--bg:#16181b;--card:#202327;--text:#ecedee;--muted:#a3a9b0;--line:#363a40;--accent:#7cb7e0}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.75 system-ui,-apple-system,"PingFang TC","Noto Sans TC",sans-serif}
header,main,footer{max-width:760px;margin:0 auto;padding:0 16px}
header{display:flex;justify-content:space-between;align-items:center;padding-top:20px;padding-bottom:20px;gap:12px;flex-wrap:wrap}
header a.brand{color:var(--accent);font-weight:700;letter-spacing:.08em;text-decoration:none;font-size:1.2rem}
nav a{color:var(--muted);margin-left:14px;text-decoration:none}nav a:first-child{margin-left:0}
h1{font-size:1.9rem;line-height:1.3;margin:24px 0 8px}h2{font-size:1.25rem;margin:32px 0 8px}
.lead{color:var(--muted);font-size:1.1rem}.note{border-left:3px solid var(--accent);padding:4px 12px;color:var(--muted)}
table{border-collapse:collapse;width:100%}th,td{border:1px solid var(--line);padding:8px;text-align:left;vertical-align:top}
footer{border-top:1px solid var(--line);margin-top:48px;padding-top:16px;padding-bottom:32px;color:var(--muted);font-size:.9rem}
a{color:var(--accent)}