:root{color-scheme:light dark;--bg:#f7f8fa;--card:#fff;--text:#202124;--muted:#5f6368;--line:#e0e3e7;--link:#0b57d0;--accent:#1a73e8}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Noto Sans SC","PingFang SC","Microsoft YaHei",Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.7}.wrap{max-width:920px;margin:0 auto;padding:48px 22px 80px}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:34px;box-shadow:0 4px 18px rgba(0,0,0,.04)}h1{font-size:34px;line-height:1.2;margin:0 0 10px}h2{font-size:21px;margin-top:32px}p,li{font-size:16px}a{color:var(--link)}.meta{color:var(--muted);margin-bottom:28px}.notice{border-left:4px solid var(--accent);padding:12px 16px;background:rgba(26,115,232,.08);border-radius:8px;margin:22px 0}.nav{display:flex;gap:18px;flex-wrap:wrap;margin:0 0 24px}.footer{color:var(--muted);margin-top:30px;font-size:14px}@media(prefers-color-scheme:dark){:root{--bg:#15171a;--card:#202124;--text:#e8eaed;--muted:#bdc1c6;--line:#3c4043;--link:#8ab4f8;--accent:#8ab4f8}}@media(max-width:600px){.wrap{padding:20px 12px 50px}.card{padding:22px}h1{font-size:28px}}