:root{color-scheme:light dark;--bg:#f5f4f1;--card:#fff;--ink:#2f302e;--muted:#646760;--line:#dcded7;--accent:#405b49;--soft:#e6eee5}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.8 system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}header,main,footer{max-width:920px;margin:auto;padding:28px 24px}header{display:flex;justify-content:space-between;gap:16px;align-items:center;border-bottom:1px solid var(--line)}a{color:var(--accent);text-underline-offset:4px}nav{display:flex;gap:20px;flex-wrap:wrap}.brand{font-weight:700;text-decoration:none}.eyebrow{font-size:13px;letter-spacing:2px;color:var(--accent);font-weight:650}.hero{padding:48px 0 28px}h1{font-size:clamp(30px,5vw,48px);line-height:1.25;letter-spacing:-1px;margin:16px 0 24px}h2{font-size:23px;line-height:1.5;margin:30px 0 12px}h3{font-size:18px;margin:0 0 8px}p{margin:12px 0}.lead{font-size:20px;color:var(--muted);max-width:720px}.meta,small{color:var(--muted);font-size:14px}.grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.card{padding:24px;background:var(--card);border:1px solid var(--line);border-radius:12px}.card p{color:var(--muted);margin-bottom:0}.notice{background:var(--soft);padding:18px 22px;border-radius:10px}.button{display:inline-block;padding:10px 18px;border-radius:8px;background:var(--accent);color:var(--bg);text-decoration:none;margin:8px 8px 8px 0}.policy{max-width:820px}.policy h1{font-size:34px}.policy section{border-top:1px solid var(--line);margin-top:28px;padding-top:4px}li{margin:7px 0}code{font-size:.9em;overflow-wrap:anywhere}footer{border-top:1px solid var(--line);color:var(--muted);font-size:14px;margin-top:40px}a:focus-visible{outline:3px solid var(--accent);outline-offset:5px}html{scroll-behavior:smooth}@media(prefers-color-scheme:dark){:root{--bg:#20221f;--card:#292c27;--ink:#e6e8e1;--muted:#b8bdb3;--line:#42483e;--accent:#b9d5bc;--soft:#303f32}}@media(max-width:600px){header,main,footer{padding:20px}.grid{grid-template-columns:1fr}header{align-items:flex-start;flex-direction:column}.hero{padding:26px 0}.lead{font-size:18px}.policy h1{font-size:28px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}