:root{--ink:#1a1a1a;--navy:#111;--blue:#1677ff;--brass:#111;--line:#bdbdbd;--paper:#d6d6d6;--card:#ececec;--red:#cb291c;--muted:#666;--wrap:1120px;--read:760px}*,:before,:after{box-sizing:border-box}html{scroll-behavior:smooth}body{color:var(--ink);background:var(--paper);font-family:Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;font-size:var(--body-size,17px);margin:0;line-height:1.75}h1,h2,h3{color:var(--navy);margin:0 0 .6em;font-family:inherit;font-weight:600;line-height:1.35}p,ul,ol,dl{margin:0 0 1em}a{color:var(--blue)}a:hover{text-decoration-thickness:2px}:focus-visible{outline:2px solid var(--blue);outline-offset:3px}.skip{z-index:40;background:var(--paper);padding:8px 12px;position:absolute;top:-48px;left:16px}.skip:focus{top:12px}.topbar{z-index:30;color:#fff;background:#000;font-size:14px;position:relative}.topbar-inner,.bar,.wrap{width:min(var(--wrap), calc(100% - 32px));margin-inline:auto}.topbar-inner{justify-content:space-between;align-items:center;gap:16px;padding:8px 0;display:flex}.top-tools{align-items:center;gap:12px;margin-left:auto;display:flex}.top-split{opacity:.45}.top-phone{align-items:center;gap:6px;display:inline-flex}.top-wait{opacity:.72}.top-link{color:#fff;font:inherit;cursor:pointer;background:0 0;border:0;align-items:center;gap:6px;padding:0;text-decoration:none;display:inline-flex}.top-link:hover,.nav a:hover,.sub a:hover,.site-footer a:hover,.catalog a:hover h3,.news-list a:hover h3,.card-grid a.panel:hover h3,.knowledge a:hover{color:var(--blue)}.wechat{position:relative}.wechat-pop{z-index:40;color:#111;text-align:center;background:#c8c8c8;border:1px solid #b0b0b0;width:180px;padding:12px;font-size:13px;line-height:1.5;display:none;position:absolute;top:calc(100% + 10px);right:0;box-shadow:0 8px 24px #00000029}.wechat:hover .wechat-pop,.wechat:focus-within .wechat-pop{display:block}.wechat-pop img{width:156px;height:auto;display:block}.wechat-pop p{margin:0}.bar{align-items:center;gap:20px;min-height:72px;display:flex;position:relative}.site-header{background:var(--paper);color:#111;z-index:20;border-bottom:1px solid var(--line);position:sticky;top:0}.brand{color:#111;align-items:center;gap:10px;margin-right:auto;text-decoration:none;display:flex}.logo{flex:none;width:48px;height:48px;display:block}.brand strong{letter-spacing:.04em;font-size:20px;display:block}.brand small{color:#666;font-size:12px;display:block}.menu-check{opacity:0;pointer-events:none;position:absolute}.menu-btn{color:#111;background:var(--paper);cursor:pointer;border:1px solid #111;padding:6px 12px}.menu-btn:hover{color:var(--blue);border-color:var(--blue)}.nav{background:var(--paper);border-top:1px solid var(--line);flex-direction:column;gap:4px;padding:8px 16px 16px;display:none;position:absolute;top:100%;left:0;right:0;box-shadow:0 8px 20px #0000000f}.menu-check:checked~.nav{display:flex}.nav a{color:#111;padding:8px 0;text-decoration:none}.nav a[aria-current=page]{color:var(--blue)}.sub{flex-direction:column;padding-left:12px;display:flex}.sub a{color:#333;font-size:15px}main{padding-bottom:48px}.hero,.panel,.catalog a,.news-list a,.qa,.spec,.sheet{background:var(--card);border:1px solid var(--line)}.hero{border-left:4px solid var(--red);margin-top:28px;padding:36px 32px 28px}.eyebrow{color:var(--muted);letter-spacing:.08em;margin:0 0 8px;font-size:14px}.hero h1{font-size:calc(clamp(32px, 4vw, 46px) * var(--heading-scale,1));margin-bottom:12px}.lede{max-width:68ch;font-size:18px}.actions{flex-wrap:wrap;gap:12px;margin-top:8px;display:flex}.btn{color:#fff;background:#111;padding:10px 16px;text-decoration:none;display:inline-block}.btn:hover{background:var(--blue);color:#fff}.btn.ghost{color:#111;background:0 0;border:1px solid #111}.btn.ghost:hover{color:var(--blue);border-color:var(--blue);background:0 0}.facts{background:var(--line);border:1px solid var(--line);grid-template-columns:1fr 1fr;gap:1px;margin:16px 0 8px;display:grid}.facts div{background:var(--card);padding:16px 18px}.facts dt{color:var(--muted);font-size:13px}.facts dd{color:var(--navy);margin:4px 0 0;font-size:18px}.section{margin-top:36px}.section h2{font-size:calc(28px * var(--heading-scale,1))}.section-head{justify-content:space-between;align-items:baseline;gap:16px;display:flex}.section-head a{color:#111;flex:none;font-size:15px;text-decoration:none}.section-head a:hover{color:var(--blue)}.catalog,.split,.card-grid,.line-grid,.quad{gap:12px;display:grid}.cert-index{gap:12px;padding:0;list-style:none;display:grid}.cert-index a{background:var(--card);border:1px solid var(--line);color:inherit;padding:18px 20px;text-decoration:none;display:block}.cert-index a:hover,.cert-index a[aria-current=true]{color:var(--blue);border-color:var(--blue)}.cert-index figure{background:var(--card);border:1px solid var(--line);border-top:0;margin:0;padding:16px}.cert-index img{object-fit:contain;background:#fff;width:100%;max-height:720px;display:block}.cert-index figcaption{color:#111;margin-top:12px}.cert-index figcaption strong,.cert-index figcaption span{display:block}.catalog a,.news-list a{color:inherit;padding:18px 20px;text-decoration:none;display:block}.catalog a:hover,.news-list a:hover,.card-grid a.panel:hover,.knowledge a:hover{border-color:var(--blue)}.kicker{color:var(--muted);font-size:13px}.catalog h3,.news-list h3,.knowledge h3{margin:4px 0;font-size:22px}.catalog p,.news-list p,.muted{color:var(--muted)}.panel{padding:20px 22px}.panel p:last-child{margin-bottom:0}a.panel{color:inherit;text-decoration:none;display:block}.sheet.wide{width:min(1120px,100% - 32px)}.panel h2{font-size:24px}.sheet{width:min(var(--read), calc(100% - 32px));margin:28px auto 0;padding:28px 28px 36px}.sheet h1{font-size:calc(clamp(28px, 4vw, 38px) * var(--heading-scale,1))}.crumb ol{color:var(--muted);flex-wrap:wrap;gap:6px;margin:0 0 18px;padding:0;font-size:14px;list-style:none;display:flex}.crumb li:not(:last-child):after{content:"/";margin-left:6px}.prose h2{font-size:calc(24px * var(--heading-scale,1));margin-top:1.4em}.prose h3{font-size:calc(20px * var(--heading-scale,1))}.prose img,.cover{max-width:100%;height:auto}.cover{margin:0 0 12px;display:block}.prose ul,.prose ol{padding-left:1.3em}.prose table{border-collapse:collapse;width:100%;margin:0 0 1em}.prose th,.prose td,.spec dt,.spec dd{border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.prose th,.prose td{padding:8px 10px}.spec{margin:0 0 1.2em;display:grid}.spec div{grid-template-columns:7.5em 1fr;gap:8px;display:grid}.spec dt,.spec dd{margin:0;padding:10px 0}.spec dt{color:var(--muted)}.qa-block{padding-top:8px}.qa-block+.qa-block{border-top:1px solid var(--line);margin-top:18px}.knowledge h3{font-size:18px}.knowledge ul{padding-left:1.2em}.knowledge-cols{gap:16px;display:grid}.knowledge-col{background:var(--card);border:1px solid var(--line);flex-direction:column;display:flex}.knowledge-col h3{color:#fff;background:#111;margin:0;padding:18px 16px;font-size:18px}.knowledge-col ul{flex:1;margin:0;padding:0;list-style:none}.knowledge-col li{border-top:1px solid var(--line)}.knowledge-col li a,.knowledge-col .col-more{color:#111;padding:12px 16px;text-decoration:none;display:block}.knowledge-col .col-more{border-top:1px solid var(--line);font-size:14px}.knowledge-col li a:hover,.knowledge-col .col-more:hover{color:var(--blue)}.news-board{gap:20px;display:grid}.news-feature{background:var(--card);border:1px solid var(--line);color:inherit;flex-direction:column;min-height:280px;text-decoration:none;display:flex}.news-feature-mark{color:#fff;letter-spacing:.12em;background:#111;flex:1;place-items:center;min-height:180px;font-size:32px;display:grid}.news-feature-copy{padding:16px 18px 18px;display:block}.news-meta{color:var(--muted);justify-content:space-between;gap:12px;font-size:13px;display:flex}.news-feature h3,.news-row h3{color:#111;margin:8px 0 0;font-size:20px}.news-side{flex-direction:column;display:flex}.news-row{border-bottom:1px solid var(--line);color:inherit;padding:16px 0;text-decoration:none;display:block}.news-row:first-child{padding-top:0}.news-row p{color:var(--muted);margin:8px 0 0}.news-feature:hover h3,.news-row:hover h3{color:var(--blue)}.news-more{text-align:center;margin:28px 0 0}.site-footer{background:var(--navy);color:#e7edf2;margin-top:48px;padding:32px 0;font-size:15px}.footer-grid{gap:20px;display:grid}.site-footer a{color:#fff;text-decoration:none}.site-footer h2{color:#fff;font-family:inherit;font-size:16px}.fine{color:#b7c3ce;margin-top:18px;font-size:13px}@media (width>=800px){.facts{grid-template-columns:repeat(4,1fr)}.catalog,.card-grid,.knowledge-cols{grid-template-columns:1fr 1fr}.line-grid{grid-template-columns:1fr 1fr 1fr}.quad{grid-template-columns:1fr 1fr 1fr 1fr}.news-board{grid-template-columns:1.05fr 1fr;align-items:stretch}.split{grid-template-columns:1.15fr .85fr}.footer-grid{grid-template-columns:1.3fr 1fr .8fr}}@media (width>=980px){.menu-btn{display:none}.nav{background:0 0;border:0;flex-flow:wrap;justify-content:flex-end;align-items:center;gap:14px;padding:0;display:flex;position:static}.has-sub{position:relative}.sub{background:var(--paper);border:1px solid var(--line);min-width:180px;padding:8px 12px;display:none;position:absolute;top:100%;left:0;box-shadow:0 8px 20px #00000014}.has-sub:hover .sub,.has-sub:focus-within .sub{display:flex}}@media (width<=640px){.topbar-inner{flex-direction:column;align-items:flex-start;gap:6px}.top-tools{align-self:flex-end}.brand small{display:none}.hero,.sheet{padding:22px 16px}.spec div{grid-template-columns:1fr;gap:0}.spec dt{padding-bottom:0}}