:root{color-scheme:light;--bg:#f8f8f5;--surface:#fff;--text:#262b2a;--muted:#656e69;--line:#dfe4df;--accent:#285f47;--soft:#eef3ef;--max:1120px;font:16px/1.85 "Segoe UI Variable Text","Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
    *{box-sizing:border-box}html{scroll-padding-top:28px}body{margin:0;background:var(--bg);color:var(--text)}a{color:var(--accent);text-decoration-thickness:1px;text-underline-offset:4px}a:hover{text-decoration-thickness:2px}a:focus-visible{outline:2px solid var(--accent);outline-offset:5px;border-radius:3px}p{margin:0 0 16px}ul{padding-left:1.35em;margin:12px 0 22px}li{margin:7px 0}strong{font-weight:650}code{font: .88em Consolas,monospace;background:var(--soft);padding:2px 5px;border-radius:4px;overflow-wrap:anywhere}
    .skip{position:absolute;left:16px;top:-100px;padding:8px 16px;background:var(--surface);z-index:2}.skip:focus{top:12px}.wrap{max-width:var(--max);margin:auto;padding:0 36px}.masthead{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:28px;padding-bottom:24px;border-bottom:1px solid var(--line)}.wordmark{display:inline-flex;align-items:center;gap:10px;font-size:15px;font-weight:650;text-decoration:none;color:var(--text)}.mark{display:grid;place-items:center;width:27px;height:27px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--accent);font-size:17px}.external{display:flex;gap:22px;font-size:13px}.external a{color:var(--muted);text-decoration:none}
    .hero{padding:58px 0 38px;border-bottom:1px solid var(--line)}.eyebrow{font-size:11px;letter-spacing:.18em;color:var(--accent);font-weight:650}.hero h1{font-size:42px;line-height:1.25;font-weight:600;letter-spacing:.06em;margin:14px 0 20px}.lede{max-width:720px;font-size:17px;color:var(--muted);line-height:1.9}.meta{display:flex;flex-wrap:wrap;gap:8px 26px;margin-top:24px;font-size:12px;color:var(--muted)}.meta span{display:inline-flex;gap:8px}.meta b{font-weight:500;color:var(--text)}
    .layout{display:grid;grid-template-columns:205px minmax(0,1fr);gap:54px;align-items:start;padding:42px 0 72px}.toc{position:sticky;top:28px;font-size:13px}.toc-label{font-size:11px;letter-spacing:.14em;color:var(--muted);margin-bottom:12px}.toc a{display:block;padding:6px 0;text-decoration:none;color:var(--muted)}.toc a:hover{color:var(--accent)}.toc small{display:block;border-top:1px solid var(--line);padding-top:20px;margin-top:22px;font-size:12px;line-height:1.8;color:var(--muted)}main{min-width:0}.summary{padding:24px 26px;border:1px solid var(--line);border-radius:12px;background:var(--surface);margin-bottom:42px}.summary h2{margin:0 0 14px;font-size:17px;font-weight:650}.summary ul{margin:0;padding-left:1.25em;font-size:14px}.summary li:last-child{margin-bottom:0}
    section{scroll-margin-top:28px;margin-bottom:42px}section h2{display:flex;align-items:baseline;gap:13px;font-size:21px;line-height:1.5;font-weight:600;margin:0 0 18px}section h2 .num{font-size:11px;font-weight:500;letter-spacing:.1em;color:var(--accent)}section h3{font-size:15px;font-weight:650;margin:24px 0 10px}.note{padding:14px 18px;border-left:3px solid var(--accent);background:var(--soft);font-size:14px;line-height:1.9;margin:20px 0}.note p:last-child{margin-bottom:0}.table-wrap{overflow-x:auto;margin:18px 0 22px;border:1px solid var(--line);border-radius:10px}table{width:100%;border-collapse:collapse;font-size:13px;line-height:1.9;text-align:left}th,td{padding:14px 16px;vertical-align:top;border-bottom:1px solid var(--line)}th{background:var(--soft);font-weight:650}th:first-child{width:27%}tr:last-child td{border-bottom:0}.muted{color:var(--muted)}.contact{padding:22px 24px;background:var(--surface);border:1px solid var(--line);border-radius:12px}.contact p:last-child{margin-bottom:0}.footer{padding:24px 0 34px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:16px;font-size:12px;color:var(--muted)}
    @media(max-width:760px){.wrap{padding:0 22px}.masthead{padding-top:20px;padding-bottom:18px}.external{gap:14px}.hero{padding:38px 0 28px}.hero h1{font-size:34px}.lede{font-size:15px}.layout{grid-template-columns:1fr;gap:28px;padding:26px 0 40px}.toc{position:static;display:flex;flex-wrap:wrap;gap:4px 18px;padding-bottom:20px;border-bottom:1px solid var(--line)}.toc-label{width:100%;margin-bottom:2px}.toc a{padding:2px 0}.toc small{display:none}.summary{padding:20px;margin-bottom:34px}section{margin-bottom:34px}section h2{font-size:19px}th,td{padding:12px}.footer{flex-direction:column;gap:5px}}
    @media(prefers-color-scheme:dark){:root{color-scheme:dark;--bg:#171b19;--surface:#1f2421;--text:#e3e8e4;--muted:#a6b1a9;--line:#354039;--accent:#9bcbb0;--soft:#25332b}}
    @media print{.masthead,.toc,.footer,.skip{display:none}.wrap{max-width:none;padding:0}.hero{padding:0 0 20px}.layout{display:block;padding:20px 0}.summary,section{break-inside:avoid}a{color:inherit}.meta{margin-top:12px}}