:root{--bg:#F4F7FA;--white:#FFF;--wash:#EAF1F6;--mint:#E9F8F8;--nav:#102E46;--ink:#18364B;--body:#344C60;--muted:#64798A;--line:#DCE6ED;--aqua:#13B8C5;--blue:#237BD3;--deep:#163C57;--footer:#0B2539;--radius:14px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:20px}body{margin:0;color:var(--body);background:var(--bg);font:16px/1.82 Arial,'PingFang SC','Microsoft YaHei',sans-serif;overflow-wrap:break-word}a{color:#1468ab;text-underline-offset:3px}a:hover{color:#075183}button{font:inherit}h1,h2,h3{color:var(--ink);line-height:1.38;margin:0 0 .7em;font-weight:750}h1{font-size:clamp(28px,3.2vw,40px)}h2{font-size:clamp(22px,2.4vw,27px)}h3{font-size:clamp(18px,1.8vw,21px)}p{margin:.65em 0 1.2em}img{max-width:100%;height:auto}section[id],article[id]{scroll-margin-top:25px}.wrap{width:min(1200px,calc(100% - 56px));margin-inline:auto}.reading{max-width:790px}.reading-wide{max-width:1000px}.section{margin-block:60px}.section-tight{margin-block:42px}.eyebrow{font-size:13px;text-transform:uppercase;letter-spacing:.16em;color:#087e8c;font-weight:750;margin-bottom:10px}.lead{font-size:18px;line-height:1.8;max-width:850px;color:#435e71}.small-note{font-size:14px;color:var(--muted)}.skip-link{position:absolute;top:-100px;left:12px;background:white;padding:8px;z-index:120}.skip-link:focus{top:12px}:focus-visible{outline:3px solid #237BD3;outline-offset:3px}.site-header{background:white;position:relative;z-index:20}.brand-bar{height:72px;display:flex;align-items:center;justify-content:space-between;gap:18px}.brand{display:inline-flex;align-items:center;gap:15px;min-width:0;text-decoration:none;color:var(--ink)}.brand-note{font-size:13px;letter-spacing:.045em;font-weight:bold;white-space:nowrap}.logo-holder{display:flex;align-items:center;min-width:100px;min-height:34px}.media-frame--logo{display:flex;align-items:center;justify-content:center;padding:0;background:transparent;border:0;min-width:92px;max-width:215px;margin:0;height:38px}.media-frame--logo img{max-height:38px;width:auto;max-width:100%;object-fit:contain}.media-frame--logo.media-missing{background:var(--wash);padding:6px 10px;border-radius:7px;min-width:116px}.media-frame--logo.media-missing span{font-size:13px}.register-link,.btn{display:inline-flex;justify-content:center;align-items:center;min-height:42px;padding:8px 18px;border-radius:9px;background:var(--deep);color:white;text-decoration:none;font-weight:700;white-space:nowrap}.register-link:hover,.btn:hover{background:#0b2639;color:white}.btn-secondary{background:var(--aqua);color:#082d35}.btn-secondary:hover{background:#0fa4ae;color:#082d35}.desktop-nav{background:var(--nav)}.nav-row{min-height:51px;display:grid;grid-template-columns:repeat(7,minmax(0,1fr));align-items:stretch;gap:5px}.desktop-nav a{color:#e5f1f7;text-decoration:none;font-size:15px;line-height:1.3;font-weight:600;text-align:center;display:flex;align-items:center;justify-content:center;position:relative;padding:12px 5px;white-space:nowrap}.desktop-nav a:hover{background:#1a445f}.desktop-nav a[aria-current=page]{font-weight:800;color:white}.desktop-nav a[aria-current=page]:after{content:'';height:3px;bottom:0;left:22%;right:22%;background:var(--aqua);position:absolute}.menu-toggle,.mobile-drawer,.menu-backdrop,.nojs-nav,.mobile-quick{display:none}.breadcrumbs{display:flex;align-items:center;gap:12px;margin:23px auto 0;font-size:13px;color:var(--muted)}.breadcrumbs a{color:#4b6576}.page-intro{padding:26px 0 25px}.page-intro h1{font-size:clamp(27px,3vw,35px);margin-bottom:12px}.page-intro .lead{margin-bottom:0}.section-nav{display:flex;gap:11px;flex-wrap:wrap;padding:15px 0;border-block:1px solid var(--line);margin-bottom:28px}.section-nav a{background:#e6eef5;border-radius:30px;padding:5px 16px;text-decoration:none;color:#174f73;font-size:14px;font-weight:700}.section-nav a:hover{background:#d7e7f0}.media-frame{display:flex;align-items:center;justify-content:center;width:100%;min-width:0;padding:8px;margin:0;background:var(--wash);border-radius:var(--radius)}.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--article{--media-limit:220px}.media-frame--mobile{--media-limit:350px;max-width:320px}.media-missing{min-height:110px;border:1px dashed #bacdd9;color:#658295;text-align:center;font-size:13px}.media-missing.media-frame--hero{min-height:185px}.media-missing.media-frame--mobile{min-height:230px}.hero{display:grid;grid-template-columns:1.08fr .92fr;align-items:center;gap:38px;padding-block:50px 36px}.hero h1{font-size:clamp(30px,3.55vw,43px)}.hero p{max-width:590px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.topic-index{border-top:2px solid var(--nav)}.topic-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:45px}.topic-entry{border-bottom:1px solid var(--line);padding:20px 0;display:grid;grid-template-columns:48px 1fr;gap:14px}.topic-number{color:#1597a3;font-size:22px;font-weight:800}.topic-entry h3{margin-bottom:3px}.topic-entry p{margin:.2em 0 .4em;font-size:15px}.feature-grid{display:grid;grid-template-columns:2fr 1fr;gap:24px}.feature-main{background:var(--deep);color:#e5f2f6;padding:32px;border-radius:var(--radius)}.feature-main h3{color:white}.feature-main a{color:#8be7ea}.feature-aside{display:grid;gap:14px}.feature-aside article{border-left:3px solid var(--aqua);background:white;padding:22px}.split{display:grid;grid-template-columns:1fr 1fr;gap:38px;align-items:center}.split--wide-text{grid-template-columns:.8fr 1.2fr}.band{background:var(--wash);padding:36px 0}.pale-band{background:var(--mint);padding:34px 0}.stripe{padding:22px 0;border-bottom:1px solid var(--line)}.stripe:last-child{border-bottom:0}.three-notes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.three-notes article{padding:20px;background:white;border-top:4px solid var(--aqua);border-radius:0 0 12px 12px}.three-notes article:nth-child(2){margin-top:20px}.three-notes article:nth-child(3){margin-top:40px}.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;counter-reset:step}.steps article{background:white;border:1px solid var(--line);padding:20px;border-radius:11px;min-width:0}.steps article:before{counter-increment:step;content:'0' counter(step);font-size:25px;color:#138c99;font-weight:800;display:block;margin-bottom:6px}.editor-note{border-left:4px solid var(--aqua);background:#ecf3f7;padding:20px 26px}.article-grid{display:grid;grid-template-columns:minmax(0,2.15fr) minmax(220px,.85fr);gap:36px;align-items:start}.article-grid>*{min-width:0}.article-copy{max-width:795px}.article-copy section{margin:0 0 43px}.fact-rail{border-top:3px solid var(--aqua);padding:16px 20px;background:white}.fact-rail h3{font-size:17px}.fact-rail ul{padding-left:20px;font-size:14px}.flow-diagram{display:flex;gap:8px;flex-wrap:wrap;align-items:stretch;margin:24px 0}.flow-diagram span{flex:1 1 140px;background:var(--mint);border:1px solid #c7e7e8;padding:13px;text-align:center;font-weight:700;border-radius:8px}.table-scroll{overflow-x:auto;max-width:100%;border:1px solid var(--line);border-radius:10px;background:white}table{border-collapse:collapse;width:100%;min-width:530px;text-align:left;font-size:15px}caption{text-align:left;font-weight:750;color:var(--ink);padding:14px 16px}th,td{border-bottom:1px solid var(--line);padding:12px 15px;vertical-align:top}th{background:#eaf1f6;color:#173a51}tbody tr:last-child td{border-bottom:0}.article-banner{margin:0 0 34px}.tip{background:var(--mint);padding:20px 24px;border-left:4px solid var(--aqua);margin:22px 0}.numbered-list{list-style:none;counter-reset:item;padding:0}.numbered-list li{counter-increment:item;padding:16px 0 16px 55px;border-bottom:1px solid var(--line);position:relative}.numbered-list li:before{content:counter(item);position:absolute;top:18px;left:0;border-radius:50%;background:var(--nav);color:white;display:grid;place-items:center;width:33px;height:33px;font-weight:bold}.matrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.matrix article{background:white;border:1px solid var(--line);border-top:4px solid var(--aqua);padding:22px;min-width:0}.matrix strong{color:var(--ink)}.gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:36px}.gallery article{min-width:0}.gallery article:nth-child(even){padding-top:42px}.gallery .media-frame{margin-bottom:18px}.index-handbook{max-width:820px;background:white;border:1px solid var(--line);padding:24px;border-radius:12px}.index-handbook ol{margin:0;padding-left:25px}.handbook{max-width:850px}.handbook section{margin:45px 0}.faq-list{max-width:900px;border-top:1px solid var(--line)}.faq-list details{border-bottom:1px solid var(--line);padding:5px 0}.faq-list summary{cursor:pointer;color:var(--ink);font-weight:700;padding:14px 24px 14px 0}.faq-list summary:hover{color:#087e8c}.faq-list p{padding:0 20px 15px 0;margin:0}.service-grid{display:grid;grid-template-columns:235px minmax(0,1fr);gap:40px}.service-aside{background:var(--wash);padding:22px;align-self:start}.service-aside a{display:block;margin:7px 0}.service-body{min-width:0}.service-body section{margin-bottom:40px}.related-links{margin:52px 0 65px;border-top:2px solid var(--nav);padding-top:24px}.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.related-grid a{background:white;border:1px solid var(--line);border-radius:10px;padding:18px;text-decoration:none;display:flex;flex-direction:column;gap:5px}.related-grid a span{font-weight:750;color:var(--ink)}.related-grid a small{color:var(--muted);font-size:13px;line-height:1.5}.related-grid a:hover{border-color:#6bb7c0}.site-footer{background:var(--footer);color:#dcecf5;padding:43px 0 15px;font-size:14px}.site-footer a{color:#dcecf5}.footer-grid{display:grid;grid-template-columns:1.6fr 1fr;gap:60px}.footer-grid p{max-width:620px}.footer-brand{text-decoration:none;font-size:21px;font-weight:800}.footer-brand small{font-size:11px;letter-spacing:.12em;margin-left:10px}.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 20px;margin-top:12px}.footer-bottom{border-top:1px solid #355368;margin-top:30px;padding-top:13px;display:flex;justify-content:space-between;gap:18px;color:#b9d1df;font-size:12px}@media(max-width:1200px){.wrap{width:calc(100% - 44px)}}@media(max-width:920px){.brand-bar{height:63px;display:grid;grid-template-columns:42px minmax(0,1fr) auto;gap:8px}.brand{justify-self:center;max-width:100%}.brand-note,.desktop-nav{display:none}.logo-holder{min-width:0;min-height:28px}.media-frame--logo{height:30px;min-width:75px;max-width:180px}.media-frame--logo img{max-height:30px}.register-link{padding:5px 10px;min-height:40px;font-size:13px}.menu-toggle{display:flex;width:40px;height:40px;border:0;background:transparent;flex-direction:column;gap:5px;justify-content:center;align-items:center;cursor:pointer}.menu-toggle span{display:block;background:var(--nav);width:23px;height:2px}.mobile-drawer{display:block;position:fixed;left:0;top:0;bottom:0;width:min(86vw,340px);max-width:100%;overflow-y:auto;background:#fff;box-shadow:6px 0 28px #071c3240;transform:translateX(-105%);transition:transform .24s ease;z-index:102;padding:17px 20px;visibility:hidden}.mobile-drawer a{display:block;text-decoration:none;padding:11px 8px;color:var(--ink);border-bottom:1px solid var(--line);font-weight:650}.mobile-drawer a[aria-current=page]{border-left:3px solid var(--aqua);padding-left:12px;background:var(--wash)}.drawer-top{display:flex;justify-content:space-between;align-items:center;border-bottom:2px solid var(--nav);padding-bottom:13px}.menu-close{width:40px;height:40px;border:0;background:var(--wash);border-radius:9px;color:var(--nav);font-size:27px;cursor:pointer}.drawer-label{color:#578192;font-size:12px;font-weight:800;letter-spacing:.13em;margin:20px 8px 3px}.menu-backdrop{display:block;position:fixed;inset:0;background:#061b2d99;opacity:0;visibility:hidden;pointer-events:none;z-index:101;transition:opacity .24s ease}.drawer-open{overflow:hidden}.drawer-open .menu-backdrop{opacity:1;visibility:visible;pointer-events:auto}.drawer-open .mobile-drawer{transform:translateX(0);visibility:visible}.nojs-nav{display:flex;flex-wrap:wrap;gap:7px 15px;padding:6px 0;font-size:13px}.nojs-nav a{color:var(--muted)}.js-ready .nojs-nav{display:none}.mobile-quick{display:flex;flex-wrap:wrap;gap:10px 22px;padding:18px 0 24px;font-size:14px}.hero{gap:22px}}@media(max-width:760px){.split,.split--wide-text,.article-grid,.feature-grid,.gallery,.service-grid{grid-template-columns:1fr}.topic-list,.matrix{grid-template-columns:1fr 1fr}.feature-aside{grid-template-columns:1fr 1fr}.steps{grid-template-columns:1fr 1fr}.article-grid .fact-rail{order:2}.service-body{order:1}.service-aside{order:2}.gallery article:nth-child(even){padding-top:0}.related-grid{grid-template-columns:1fr 1fr}.footer-grid{gap:20px}.hero{grid-template-columns:1fr}.hero>.media-frame{max-width:600px;margin:0 auto}}@media(max-width:640px){body{font-size:15px;line-height:1.76}.wrap{width:calc(100% - 32px)}.section{margin-block:35px}.section-tight{margin-block:28px}.hero{padding:30px 0 14px}.hero h1{font-size:clamp(27px,8vw,32px)}.lead{font-size:16px}.page-intro{padding:18px 0}.page-intro h1{font-size:clamp(25px,7vw,29px)}h2{font-size:21px}h3{font-size:18px}.topic-list,.feature-aside,.matrix,.three-notes,.steps,.related-grid,.footer-grid{grid-template-columns:1fr}.topic-entry{grid-template-columns:36px 1fr;gap:10px;padding:15px 0}.feature-main{padding:22px}.three-notes article:nth-child(n){margin-top:0}.band,.pale-band{padding:26px 0}.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--article{--media-limit:175px}.media-frame--mobile{--media-limit:285px;max-width:250px}.media-frame--logo{--media-limit:30px}.section-nav{gap:8px}.section-nav a{font-size:13px;padding:5px 12px}.footer-bottom{flex-direction:column;gap:3px}.footer-grid{gap:22px}.footer-links{gap:9px}.table-scroll{margin-inline:-1px}.service-aside{padding:16px}.index-handbook{padding:18px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}