:root{--ink:#15213a;--muted:#56647a;--blue:#1469d8;--soft:#edf5ff;--line:#dbe5f1;--canvas:#f3f6fa}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--canvas);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.85}
a{color:var(--blue);text-underline-offset:4px}a:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:5px}img{display:block;max-width:100%;height:auto}button,a,summary{-webkit-tap-highlight-color:transparent}
.shell{width:min(1120px,calc(100% - 48px));margin:0 auto}.site-header{background:#fff;border-bottom:1px solid var(--line)}.top-nav{display:flex;align-items:center;justify-content:space-between;min-height:74px;gap:20px}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-size:20px;font-weight:750;white-space:nowrap}.nav-items{display:flex;align-items:center;gap:26px}.nav-items a{display:flex;align-items:center;min-height:44px;text-decoration:none;font-size:14px;font-weight:600}.nav-start{background:var(--soft);padding:0 17px;border-radius:10px}
.skip-link{position:absolute;top:-100px;left:16px;z-index:9;background:#fff;padding:12px}.skip-link:focus{top:8px}.breadcrumbs{display:flex;flex-wrap:wrap;gap:8px;padding-top:29px;font-size:13px;color:var(--muted)}.breadcrumbs a{color:var(--muted)}.guide-hero{max-width:890px;padding:34px 0 36px}.eyebrow{color:var(--blue);font-size:13px;font-weight:750;letter-spacing:1px;margin:0 0 12px}h1{margin:0;font-size:clamp(30px,4vw,43px);line-height:1.35;letter-spacing:-1px}.lead{margin:20px 0 0;color:var(--muted);font-size:18px;line-height:1.85}.updated{font-size:12px;color:var(--muted);margin:18px 0 0}
.reading-grid{display:grid;grid-template-columns:minmax(0,1fr) 266px;gap:32px;align-items:start}.guide-body{min-width:0;background:#fff;border:1px solid var(--line);border-radius:20px;padding:12px 36px 32px}.article-section{scroll-margin-top:28px;padding-top:28px}.guide-body h2{font-size:24px;line-height:1.55;margin:0 0 18px}.guide-body p{font-size:16px;margin:0 0 18px}.guide-body li{margin:0 0 13px}.guide-body ol,.guide-body ul{margin:0 0 24px;padding-left:25px}.guide-body strong{font-weight:700}.guide-body figure{margin:25px 0 28px}.guide-body figure img{border-radius:12px}.guide-body figcaption{font-size:12px;color:var(--muted);line-height:1.7;margin:10px 0 0;text-align:center}.product-figure img{width:260px;margin:0 auto;border:1px solid var(--line)}.callout{margin:23px 0;padding:18px 20px;border-left:4px solid var(--blue);background:var(--soft);border-radius:0 10px 10px 0}.callout p{margin:6px 0 0}.muted{color:var(--muted);font-size:13px!important}.reading-aside{position:sticky;top:24px;min-width:0}.toc,.aside-start{border:1px solid var(--line);border-radius:15px;padding:23px;background:#fff}.toc h2,.aside-start h2{font-size:17px;line-height:1.6;margin:0 0 12px}.toc ol{margin:0;padding-left:20px}.toc li{font-size:14px;margin-bottom:12px}.toc li:last-child{margin:0}.toc a{color:var(--muted)}.aside-start{margin-top:18px;background:var(--soft)}.aside-start p{font-size:14px;color:var(--muted)}.button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 18px;background:var(--blue);color:#fff;text-decoration:none;font-size:14px;font-weight:650;border-radius:10px}
.table-wrap{overflow-x:auto;margin:22px 0}table{width:100%;border-collapse:collapse;font-size:14px}caption{text-align:left;font-weight:700;margin-bottom:12px}th,td{padding:13px 10px;text-align:left;border-bottom:1px solid var(--line)}thead th{background:var(--soft)}details{border-top:1px solid var(--line);padding:14px 0}details:last-child{border-bottom:1px solid var(--line)}summary{cursor:pointer;font-size:16px;font-weight:600;line-height:1.6;padding:4px 0}details p{margin:13px 0 5px!important;color:var(--muted)}
.guide-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.guide-card{display:block;position:relative;min-width:0;padding:30px;border:1px solid var(--line);border-radius:18px;background:#fff;color:var(--ink);text-decoration:none;transition:border-color .15s,box-shadow .15s}.guide-card:hover{border-color:#a9caef;box-shadow:0 12px 30px #25476f0c}.card-no{color:var(--blue);font-size:13px;font-weight:700}.guide-card h3{font-size:24px;line-height:1.5;margin:13px 0 12px}.guide-card p{font-size:15px;line-height:1.8;color:var(--muted);margin:0 0 18px}.card-link{color:var(--blue);font-size:14px;font-weight:650}.related{padding:45px 0 10px}.related>h2,.hub-note>h2{font-size:24px;margin:0 0 22px}.related .guide-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.related .guide-card{padding:24px}.related .guide-card h3{font-size:20px}.hub-note{max-width:850px;padding:48px 0 8px}.hub-note p{font-size:16px;color:var(--muted);margin:0 0 16px}
.start-panel{scroll-margin-top:20px;padding:32px 36px;margin:42px 0;background:#fff;border:1px solid var(--line);border-radius:20px}.start-panel h2{margin:0;font-size:29px;line-height:1.5}.start-panel p{margin:12px 0 0;font-size:16px}.start-panel .eyebrow{margin:0 0 10px;font-size:13px}.qr-link{display:block;width:min(100%,620px);margin:24px auto 0}.qr-link img{width:100%;height:auto;border-radius:14px}.site-footer{text-align:center;padding:20px 0 38px;color:var(--muted);font-size:12px}.site-footer p{margin:0 0 14px}.filings{display:flex;flex-wrap:wrap;justify-content:center;gap:12px 22px}.filings a{display:inline-flex;align-items:center;gap:5px;color:var(--muted);text-decoration:none}.filings img{width:18px;height:19px}
@media(max-width:820px){.reading-grid{grid-template-columns:1fr}.reading-aside{position:static;display:none}.related .guide-grid{grid-template-columns:1fr}.guide-hero{padding-bottom:28px}.guide-body{padding:8px 26px 30px}.shell{width:calc(100% - 36px)}}
@media(max-width:540px){.top-nav{min-height:68px;gap:14px}.brand{font-size:17px;gap:7px}.brand img{width:29px;height:29px}.nav-items{gap:12px}.nav-items a{font-size:12px}.nav-start{padding:0 11px}.guide-hero{padding-top:26px}.lead{font-size:16px}.guide-grid{grid-template-columns:1fr;gap:16px}.guide-card{padding:24px}.guide-body{padding:2px 19px 24px;border-radius:14px}.guide-body h2{font-size:21px}.guide-body p,.guide-body li{font-size:15px}.guide-body figure{margin:22px 0}.article-section{padding-top:24px}.breadcrumbs{padding-top:23px;font-size:12px}.start-panel{padding:25px 20px;margin:30px 0;border-radius:14px}.start-panel h2{font-size:24px}.start-panel p{font-size:15px}.qr-link{width:min(100%,252px)}.qr-link img{aspect-ratio:1;object-fit:cover;object-position:left center}.hub-note{padding-top:32px}.filings{gap:10px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.guide-card{transition:none}}