:root{--bg:#F4F7FA;--white:#fff;--panel:#EAF1F6;--mint:#E9F8F8;--nav:#102E46;--dark:#163C57;--teal:#13B8C5;--blue:#237BD3;--ink:#18364B;--body:#344C60;--muted:#64798A;--line:#DCE6ED;--footer:#0B2539;--gap:clamp(30px,4.5vw,64px)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--body);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif;overflow-x:clip}img{max-width:100%;height:auto}a{color:#1365AB;text-decoration-thickness:1px;text-underline-offset:4px}a:hover{color:#08477D}button{font:inherit;cursor:pointer}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #13B8C5;outline-offset:3px}h1,h2,h3,h4{color:var(--ink);line-height:1.35;margin:0 0 .7em}h1{font-size:clamp(32px,3vw,36px);letter-spacing:-.025em}h2{font-size:clamp(23px,2.4vw,27px)}h3{font-size:clamp(18px,1.8vw,21px)}p{margin:0 0 1.1em}ul,ol{padding-left:1.5em}li+li{margin-top:.3em}section{scroll-margin-top:22px}.wrap{width:min(1200px,calc(100% - 56px));margin-inline:auto}.section{margin-block:var(--gap)}.section-head{margin-bottom:24px}.section-head p{max-width:780px}.eyebrow{display:block;color:#087A89;font-size:13px;letter-spacing:.13em;font-weight:700;margin-bottom:10px;text-transform:uppercase}.lead{font-size:17px;color:#445F71;max-width:790px}.prose{max-width:790px}.prose p{line-height:1.84}.page-intro{padding:37px 0 12px;border-bottom:1px solid var(--line)}.page-intro .lead{max-width:850px}.breadcrumbs{display:flex;gap:12px;align-items:center;font-size:13px;color:var(--muted);margin-bottom:22px}.breadcrumbs a{color:#37627c}.skip-link{position:absolute;top:-90px;left:16px;z-index:30;background:#fff;padding:12px}.skip-link:focus{top:8px}.site-header{background:#fff}.brand-row{height:72px;display:flex;align-items:center;gap:23px}.brand{display:flex;align-items:center;min-width:0;text-decoration:none;color:var(--ink)}.brand img{height:auto;max-height:38px;width:auto;max-width:215px;object-fit:contain}.brand-word{font-size:23px;line-height:1.1;font-weight:800;white-space:nowrap}.brand-word small{display:block;font-size:10px;letter-spacing:.15em;margin-top:5px}.brand-tagline{color:var(--muted);font-size:13px}.register-link{margin-left:auto;white-space:nowrap;background:var(--dark);border-radius:9px;color:#fff;text-decoration:none;font-weight:700;font-size:14px;padding:9px 18px}.register-link:hover{background:#245979;color:#fff}.desktop-nav{background:var(--nav)}.nav-grid{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));align-items:stretch;height:50px}.nav-grid a{color:#e0eaf1;text-align:center;display:flex;justify-content:center;align-items:center;position:relative;font-size:15px;text-decoration:none;white-space:nowrap;min-width:0}.nav-grid a:hover,.nav-grid a[aria-current=page]{color:#fff;background:rgba(255,255,255,.08);font-weight:700}.nav-grid a[aria-current=page]:after{content:"";position:absolute;bottom:0;height:3px;width:34px;background:#13B8C5;border-radius:4px}.menu-toggle{display:none}.drawer-overlay{position:fixed;inset:0;background:rgba(5,22,34,.6);z-index:40;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.mobile-drawer{position:fixed;inset:0 auto 0 0;z-index:41;width:min(86vw,340px);overflow-y:auto;overscroll-behavior:contain;background:#fff;visibility:hidden;transform:translateX(-105%);transition:transform .22s,visibility .22s;box-shadow:10px 0 35px #0b253926}.drawer-open{overflow:hidden}.drawer-open .drawer-overlay{opacity:1;visibility:visible;pointer-events:auto}.drawer-open .mobile-drawer{transform:translateX(0);visibility:visible}.drawer-head{display:flex;justify-content:space-between;align-items:center;padding:17px 20px;border-bottom:1px solid var(--line)}.drawer-close{background:var(--panel);border:0;border-radius:8px;width:42px;height:42px;font-size:29px;line-height:1}.drawer-group{padding:15px 20px;border-bottom:1px solid var(--line)}.drawer-group-title{font-size:12px;color:var(--muted);font-weight:700;letter-spacing:.12em}.drawer-group a{display:block;padding:9px 12px;border-radius:8px;text-decoration:none;color:var(--ink)}.drawer-group a[aria-current=page]{border-left:3px solid var(--teal);background:var(--panel);font-weight:700}.nojs-nav{display:none}.media-frame{width:100%;min-width:0;margin:0;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:8px;display:flex;align-items:center;justify-content:center;overflow:visible}.media-frame img{display:block;width:auto;height:auto;max-width:100%;max-height:var(--media-limit,220px);object-fit:contain;object-position:center}.media-frame--hero{--media-limit:310px}.media-frame--feature{--media-limit:250px}.media-frame--card{--media-limit:185px}.media-frame--wide{--media-limit:210px}.media-frame--mobile{--media-limit:350px;max-width:320px}.media-missing{min-height:120px;color:#697f8d;font-size:13px;text-align:center}.media-frame--hero.media-missing{min-height:195px}.media-frame--card.media-missing{min-height:100px}.media-frame--mobile.media-missing{min-height:210px}.hero{padding-top:46px;display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,1fr);gap:38px;align-items:center}.home-hero h1{font-size:clamp(35px,3.6vw,43px)}.hero-copy p{max-width:630px}.link-buttons{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;border-radius:9px;padding:9px 16px;font-weight:700;text-decoration:none;font-size:14px}.btn-dark{background:var(--dark);color:white}.btn-dark:hover{background:#245979;color:#fff}.btn-outline{border:1px solid #8195a2;color:var(--ink)}.btn-outline:hover{background:var(--panel)}.topic-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 32px;border-top:2px solid var(--dark)}.topic-entry{padding:23px 7px;border-bottom:1px solid var(--line);display:grid;grid-template-columns:42px minmax(0,1fr);gap:10px}.topic-num{color:#087d8c;font-weight:800;font-size:15px}.topic-entry h3{margin:0 0 7px}.topic-entry p{font-size:15px;margin:0 0 7px}.focus-grid{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:22px}.focus-main{background:var(--dark);color:#e0eaf0;padding:clamp(24px,3vw,42px);border-radius:13px}.focus-main h3{color:#fff;font-size:26px}.focus-main a{color:#9feaf0}.focus-side{display:grid;gap:16px}.focus-side article{padding:24px;background:#fff;border-top:3px solid var(--teal)}.split{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:40px;align-items:center}.band{padding:26px;border:1px solid var(--line);border-radius:13px;background:#fff}.mint-band{background:var(--mint);padding:25px 30px;border-left:4px solid var(--teal)}.rule-notes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.rule-notes article{padding:24px;background:#fff;border:1px solid var(--line);border-radius:12px}.rule-notes article:nth-child(2){margin-top:20px}.rule-notes article:nth-child(3){margin-top:40px}.reading-route{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;counter-reset:route}.reading-route article{border-top:2px solid #13B8C5;padding:15px;background:#fff}.reading-route article:before{counter-increment:route;content:'0' counter(route);display:block;color:#0a818c;font-size:13px;font-weight:800}.reading-route h3{margin:8px 0}.anchor-nav{display:flex;flex-wrap:wrap;gap:10px;margin:25px 0}.anchor-nav a{display:inline-block;background:#fff;border:1px solid var(--line);border-radius:8px;padding:8px 14px;text-decoration:none;font-size:14px;font-weight:700}.article-layout{display:grid;grid-template-columns:minmax(0,2.4fr) minmax(200px,1fr);gap:36px;align-items:start}.fact-panel{background:#EAF1F6;border-radius:12px;padding:24px;border:1px solid var(--line)}.fact-panel ul{margin-bottom:0}.chapter{margin:0 0 34px}.chapter h2{padding-bottom:10px;border-bottom:1px solid var(--line)}.process{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.process article{padding:22px;background:#fff;border:1px solid var(--line);border-top:3px solid var(--teal)}.process strong{color:#07838e}.table-scroll{overflow-x:auto;max-width:100%;border:1px solid var(--line);border-radius:12px;background:#fff}.data-table{width:100%;min-width:560px;border-collapse:collapse;font-size:15px;line-height:1.65}.data-table caption{font-weight:700;text-align:left;padding:15px;color:var(--ink)}.data-table th,.data-table td{padding:15px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}.data-table th{color:var(--ink);background:#EAF1F6}.data-table tr:last-child td{border-bottom:0}.steps{counter-reset:steps;list-style:none;padding:0}.steps li{margin:0;padding:14px 0 14px 54px;border-bottom:1px solid var(--line);position:relative}.steps li:before{counter-increment:steps;content:counter(steps,decimal-leading-zero);position:absolute;left:0;top:15px;font-weight:800;color:#0b8390}.reading-column{max-width:800px;margin-inline:auto}.aside-note{border-left:4px solid var(--teal);background:var(--mint);padding:20px 24px;margin:20px 0}.project-matrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.project-matrix article{padding:25px;background:#fff;border:1px solid var(--line);border-radius:12px}.project-matrix h3{color:#136a82}.editorial-pair{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:32px;align-items:center}.editorial-pair:nth-child(even)>:first-child{order:2}.gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:32px;align-items:start}.gallery article{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;padding:16px}.gallery article:nth-child(even){margin-top:38px}.gallery h3{margin:18px 6px 8px}.gallery p{margin:0 6px 10px}.rules-index{padding:24px 30px;background:#fff;border-left:4px solid var(--teal);max-width:720px}.rules-index a{display:block;padding:7px 0}.faq-list details{border-bottom:1px solid var(--line);background:#fff;padding:0 18px}.faq-list details:first-child{border-radius:10px 10px 0 0}.faq-list details:last-child{border-radius:0 0 10px 10px}.faq-list summary{cursor:pointer;padding:17px 14px 17px 0;font-weight:700;color:var(--ink)}.faq-list details p{padding:0 15px 15px 0}.service-layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:44px;align-items:start}.service-nav{position:sticky;top:18px;background:#fff;border:1px solid var(--line);padding:20px;border-radius:12px}.service-nav a{display:block;padding:8px 5px}.service-content>.section:first-child{margin-top:0}.related{padding:22px 26px;border-radius:12px;background:var(--panel)}.related a{display:inline-block;margin:4px 15px 4px 0}.mobile-quicklinks{display:none}.site-footer{background:var(--footer);color:#DCECF5;margin-top:70px;font-size:14px}.footer-layout{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:45px;padding:45px 0}.footer-layout p{max-width:650px}.footer-layout nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.site-footer a{color:#DCECF5}.footer-brand{font-size:20px;color:#fff}.footer-brand span{font-size:11px;letter-spacing:.15em}.footer-bottom{border-top:1px solid #35556b;padding:15px 0;color:#c2d4de;font-size:12px}.back-top{position:fixed;right:19px;bottom:20px;border:0;border-radius:50%;background:var(--dark);color:white;width:43px;height:43px;box-shadow:0 4px 14px #102e4633}.back-top[hidden]{display:none}
@media(max-width:920px){.wrap{width:calc(100% - 44px)}.brand-row{height:63px;gap:12px;justify-content:space-between}.brand-tagline,.desktop-nav{display:none}.menu-toggle{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;flex:0 0 40px;width:40px;height:40px;background:transparent;border:1px solid var(--line);border-radius:9px}.menu-toggle span{height:2px;width:19px;background:var(--ink)}.brand{position:absolute;left:50%;transform:translateX(-50%);max-width:calc(100% - 168px)}.brand img{max-height:30px;max-width:100%}.brand-word{font-size:18px}.brand-word small{font-size:8px}.register-link{margin-left:auto;padding:8px 10px;min-height:39px;font-size:12px}.nojs-nav{display:flex;gap:9px;flex-wrap:wrap;padding:12px 0}.nojs-nav a{padding:3px 8px}.hero{gap:23px}.service-layout{grid-template-columns:210px minmax(0,1fr);gap:22px}}
@media(max-width:760px){.split,.focus-grid,.article-layout,.editorial-pair,.service-layout,.gallery{grid-template-columns:minmax(0,1fr)}.editorial-pair:nth-child(even)>:first-child{order:0}.project-matrix{grid-template-columns:1fr}.process{grid-template-columns:1fr}.service-content{order:0}.service-nav{order:1;position:static}.gallery article:nth-child(even){margin-top:0}.rule-notes{grid-template-columns:1fr}.rule-notes article:nth-child(n){margin-top:0}.reading-route{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-layout{grid-template-columns:1fr}.hero{grid-template-columns:1fr}.hero .hero-copy{order:0}.hero .media-frame{order:1}.topic-list{grid-template-columns:1fr}.mobile-quicklinks{display:flex;justify-content:space-between;gap:8px;padding-top:30px;flex-wrap:wrap;font-size:13px}.mobile-quicklinks a{padding:6px 0}}
@media(max-width:640px){body{font-size:15px}.wrap{width:calc(100% - 32px)}h1{font-size:clamp(25px,7vw,29px)}.home-hero h1{font-size:clamp(27px,7.8vw,32px)}h2{font-size:clamp(20px,6vw,23px)}h3{font-size:clamp(17px,5vw,19px)}.lead{font-size:16px}.hero{padding-top:28px}.media-frame--hero{--media-limit:205px}.media-frame--feature{--media-limit:185px}.media-frame--card{--media-limit:145px}.media-frame--wide{--media-limit:135px}.media-frame--mobile{--media-limit:285px;max-width:250px}.media-missing{min-height:95px}.media-frame--hero.media-missing{min-height:145px}.media-frame--mobile.media-missing{min-height:170px}.band,.mint-band{padding:18px}.reading-route{grid-template-columns:1fr}.focus-main{padding:25px}.footer-layout{padding:35px 0}.footer-layout nav{grid-template-columns:repeat(2,minmax(0,1fr))}.page-intro{padding-top:25px}.section-head{margin-bottom:18px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
