:root{color-scheme:dark;--blue:#1467ff;--ink:#ffffff;--body:#c8ccd4;--muted:#a3adbc;--line:#29303a;--surface:#171c24;--page:#0f1216}
*{box-sizing:border-box}html{scroll-padding-top:24px}body{margin:0;background:var(--page);color:var(--body);font-family:"Nunito",Helvetica,Arial,"PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.85;-webkit-text-size-adjust:100%}
a{color:#81b2ff;text-underline-offset:4px}a:hover{color:#c3dcff}a:focus-visible,summary:focus-visible{outline:3px solid #81b2ff;outline-offset:5px;border-radius:3px}
.skip{position:absolute;left:16px;top:-100px;background:var(--ink);color:var(--page);padding:8px 14px;z-index:2}.skip:focus{top:12px}
header,main,footer{width:min(100% - 48px,960px);margin-inline:auto}header{padding:24px 0;display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);flex-shrink:0}.brand img{width:48px;height:48px;border-radius:12px;background:#fff}.brand strong{font-family:"Saira",Helvetica,Arial,sans-serif;font-size:20px;letter-spacing:.02em}.brand span{display:block;font-size:12px;color:var(--muted);line-height:1.3}
nav{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:10px 22px;font-size:14px}nav a{text-decoration:none;color:var(--muted)}nav a[aria-current=page]{color:var(--ink)}
main{padding:56px 0 64px}.eyebrow{margin:0 0 12px;color:#81b2ff;font-size:13px;letter-spacing:.08em}h1,h2,h3{color:var(--ink);font-family:"Saira",Helvetica,Arial,"PingFang SC","Microsoft YaHei",sans-serif;font-weight:600;line-height:1.4;overflow-wrap:anywhere}h1{margin:0 0 18px;font-size:clamp(28px,5vw,42px);letter-spacing:-.025em}h2{margin:0 0 14px;font-size:22px}h3{margin:0 0 8px;font-size:18px}
p{margin:0 0 16px;overflow-wrap:anywhere}.lead{max-width:720px;font-size:18px}.meta{font-size:13px;color:var(--muted);margin-top:24px}.hero{margin-bottom:40px}.hero-mark{width:88px;height:88px;background:#fff;border-radius:22px;margin-bottom:24px;display:block}
section{padding:28px 0;border-top:1px solid var(--line)}section p:last-child{margin-bottom:0}.notice{padding:20px 24px;background:var(--surface);border-left:3px solid var(--blue);margin:28px 0}.notice p:last-child{margin-bottom:0}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:26px}.grid article{min-width:0}.grid p{font-size:15px;color:var(--muted)}ul,ol{padding-left:24px;margin:0 0 16px}li{padding-left:3px;margin:8px 0}
.table-wrap{width:100%;overflow:auto;margin:16px 0}table{width:100%;border-collapse:collapse;font-size:15px;text-align:left}caption{text-align:left;color:var(--muted);font-size:13px;padding-bottom:12px}th,td{padding:13px 14px;border:1px solid var(--line);vertical-align:top;overflow-wrap:anywhere}th{color:var(--ink);background:var(--surface);font-weight:600}
.jump{display:flex;flex-wrap:wrap;gap:10px 22px;padding:0;list-style:none;margin:24px 0 36px;font-size:14px}details{border-top:1px solid var(--line);padding:18px 0}details:last-child{border-bottom:1px solid var(--line)}summary{color:var(--ink);font-weight:600;cursor:pointer}details p{margin:14px 0 0;color:var(--body)}
footer{padding:24px 0 36px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;font-size:13px;color:var(--muted)}footer p{margin:0}footer div{display:flex;flex-wrap:wrap;gap:10px 20px}
@media(max-width:640px){header,main,footer{width:calc(100% - 36px)}header{align-items:flex-start;flex-direction:column;gap:18px;padding:20px 0}nav{justify-content:flex-start;gap:10px 20px}main{padding:36px 0 42px}.hero{margin-bottom:30px}.grid{grid-template-columns:1fr;gap:20px}section{padding:24px 0}.notice{padding:16px 18px}footer{flex-direction:column;gap:12px}.lead{font-size:17px}th,td{padding:10px}h2{font-size:20px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}