:root{--bg:#F4F7FA;--paper:#fff;--soft:#EAF1F6;--mint:#E9F8F8;--nav:#102E46;--nav2:#163C57;--teal:#13B8C5;--blue:#237BD3;--head:#18364B;--text:#344C60;--muted:#64798A;--border:#DCE6ED;--footer:#0B2539;--measure:780px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:22px}body{margin:0;background:var(--bg);color:var(--text);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.8;overflow-x:hidden}body.drawer-open{overflow:hidden}img{max-width:100%}a{color:#146CAC;text-underline-offset:3px}a:hover{color:#0C526F}button{font:inherit;cursor:pointer}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #13B8C5;outline-offset:3px}.container{width:min(100% - 56px,1200px);margin-inline:auto}.skip-link{position:absolute;left:10px;top:-100px;background:#fff;z-index:120;padding:10px}.skip-link:focus{top:10px}.site-header{background:#fff}.brand-bar{background:#fff}.brand-inner{height:72px;display:flex;align-items:center;gap:20px}.brand{display:flex;align-items:center;max-width:245px;text-decoration:none}.brand .media-frame{background:transparent;border:0;padding:0;min-height:0}.brand .media-frame img{max-height:38px}.brand-fallback{font-size:22px;letter-spacing:.03em;font-weight:800;color:var(--nav)}.brand-fallback b{color:#0798A5}.brand:has(img) .brand-fallback{display:none}.brand-tagline{color:var(--muted);font-size:13px}.register-link{margin-left:auto;display:inline-flex;align-items:center;justify-content:center;min-height:41px;padding:0 20px;border-radius:8px;background:var(--nav);color:white;font-weight:700;text-decoration:none;white-space:nowrap}.register-link:hover{background:#195071;color:white}.desktop-nav{background:var(--nav)}.nav-inner{display:flex;justify-content:space-between;align-items:center;gap:4px;min-height:50px}.nav-inner a{flex:1;text-align:center;white-space:nowrap;text-decoration:none;color:#dcecf5;font-size:15px;padding:11px 4px;border-bottom:3px solid transparent}.nav-inner a:hover,.nav-inner a[aria-current]{color:#fff;border-bottom-color:var(--teal);font-weight:700}.menu-toggle,.nojs-nav,.mobile-drawer,.drawer-backdrop,.mobile-bottom-links{display:none}.page-shell{padding:35px 0 75px}.page-hero{padding:38px 0 18px}.page-label,.eyebrow{color:#087b87;letter-spacing:.12em;text-transform:uppercase;font-weight:800;font-size:12px}.page-hero h1,.cover h1{margin:10px 0 14px;max-width:850px;font-size:35px;line-height:1.35;color:var(--head)}.page-hero p{max-width:800px;margin:0 0 14px;font-size:17px}.cover{display:grid;grid-template-columns:minmax(0,52fr) minmax(0,48fr);align-items:center;gap:34px;padding:48px 0 30px}.cover h1{font-size:42px}.cover p{font-size:17px;max-width:600px}.cover .media-placeholder{min-height:240px}.cover-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.btn{display:inline-flex;padding:10px 19px;text-decoration:none;color:white;background:var(--nav);border-radius:8px;font-weight:700}.btn:hover{background:var(--nav2);color:white}.btn-alt{background:var(--teal);color:#082d36}.btn-alt:hover{background:#11a8b4;color:#082d36}.section{margin-top:55px}.section h2,.related h2{font-size:27px;line-height:1.35;color:var(--head);margin:0 0 16px}.section h3{font-size:20px;color:var(--head);margin:26px 0 8px}.section p{margin:0 0 17px}.section-lead{max-width:var(--measure);font-size:17px}.intro-strip{border-left:4px solid var(--teal);padding:14px 22px;background:var(--mint)}.editor-grid{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:26px}.editor-grid>*,.split>*,.gallery-grid>*,.topic-index>*,.article-aside>*,.service-layout>*{min-width:0}.panel{padding:24px;border:1px solid var(--border);background:white;border-radius:12px}.panel h3{margin-top:0}.soft-panel{background:var(--soft)}.dark-panel{background:var(--nav2);color:#e8f7fb;border-radius:14px;padding:25px}.dark-panel h2,.dark-panel h3{color:white}.topic-index{display:grid;grid-template-columns:1fr 1fr;column-gap:38px}.topic-item{border-top:1px solid var(--border);padding:16px 0}.topic-item h3{font-size:19px;margin:0 0 4px}.topic-item h3 a{color:var(--head);text-decoration:none}.topic-item p{margin:0;font-size:15px;color:var(--muted)}.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:center;gap:32px}.split.wide-text{grid-template-columns:minmax(0,1.35fr) minmax(0,.65fr)}.split.reverse .media-frame{order:-1}.reading-flow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;counter-reset:read}.reading-flow>div{padding:18px;background:white;border-top:4px solid var(--teal);border-radius:7px}.reading-flow strong{display:block;color:var(--head)}.mini-list{margin:0;padding-left:23px}.mini-list li{margin:7px 0}.media-frame{display:flex;align-items:center;justify-content:center;width:100%;min-width:0;margin:0;padding:9px;border-radius:14px;background:var(--soft)}.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--mobile{--media-limit:350px;max-width:320px;margin-inline:auto}.media-frame--logo{--media-limit:38px}.media-placeholder{min-height:145px;border:1px dashed #b6cdd7;color:var(--muted);font-size:14px}.media-frame--hero.media-placeholder{min-height:230px}.media-frame--mobile.media-placeholder{min-height:260px}.article-column{max-width:var(--measure)}.article-column p{margin:0 0 18px}.article-aside{display:grid;grid-template-columns:minmax(0,2.5fr) minmax(210px,1fr);gap:32px;align-items:start}.side-index{padding:20px;border:1px solid var(--border);border-radius:12px;background:white}.side-index h3{margin:0 0 10px}.side-index a{display:block;padding:7px 0}.anchor-nav{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}.anchor-nav a{border:1px solid #bdd6e1;background:white;border-radius:8px;padding:6px 14px;text-decoration:none}.data-scroll{max-width:100%;overflow-x:auto}.data-table{width:100%;min-width:570px;border-collapse:collapse;background:white;line-height:1.65}.data-table caption{text-align:left;font-weight:700;color:var(--head);padding:10px 0}.data-table th,.data-table td{padding:13px 14px;border:1px solid var(--border);text-align:left;vertical-align:top}.data-table th{background:var(--soft);color:var(--head)}.steps{list-style:none;padding:0;counter-reset:step}.steps li{position:relative;padding:0 0 19px 60px;border-left:1px solid #c1d4df;margin-left:20px}.steps li:before{counter-increment:step;content:counter(step,decimal-leading-zero);position:absolute;left:-21px;top:0;background:var(--nav);color:white;display:grid;place-items:center;width:40px;height:40px;border-radius:50%;font-weight:700}.steps li strong{display:block;color:var(--head)}.gallery-grid{display:grid;grid-template-columns:1fr 1fr;gap:27px}.gallery-grid .exhibit:nth-child(2){margin-top:52px}.exhibit{padding:18px;background:white;border:1px solid var(--border);border-radius:12px}.exhibit h3{margin:12px 0 4px}.related{padding:25px;margin-top:52px;background:var(--soft);border-radius:12px}.related-links{display:flex;flex-wrap:wrap;gap:12px}.related-links a{background:white;border:1px solid var(--border);padding:8px 14px;border-radius:8px;text-decoration:none}.faq-list{border-top:1px solid var(--border)}.faq-list details{border-bottom:1px solid var(--border);background:white}.faq-list summary{padding:14px 18px;font-weight:700;cursor:pointer;color:var(--head)}.faq-list details p{padding:0 18px 18px;margin:0}.service-layout{display:grid;grid-template-columns:minmax(200px,260px) minmax(0,1fr);gap:32px}.service-layout>aside{grid-column:1;grid-row:1}.service-layout>article{grid-column:2;grid-row:1}.site-footer{background:var(--footer);color:#dcecf5;padding:45px 0 20px}.footer-layout{display:grid;grid-template-columns:1.5fr 1fr;gap:38px}.site-footer h2{color:#fff;font-size:23px;margin:0}.site-footer h2 span{font-size:13px;color:#78dce2}.site-footer h3{margin-top:0;color:#fff}.site-footer p{font-size:14px;max-width:680px}.footer-links{display:grid;grid-template-columns:1fr 1fr;gap:8px}.footer-links a{color:#dcecf5;text-decoration:none;font-size:14px}.footer-note{margin-top:30px;border-top:1px solid #3c5966;padding-top:15px;color:#b0cbd5;font-size:12px}.to-top{position:fixed;right:20px;bottom:22px;background:var(--nav);color:white;border:0;border-radius:50%;width:43px;height:43px;z-index:30}.to-top[hidden]{display:none}
@media(max-width:1200px){.container{width:min(100% - 44px,1200px)}}
@media(max-width:920px){.container{width:min(100% - 44px,1200px)}.brand-inner{height:63px;justify-content:space-between;gap:9px}.brand-tagline,.desktop-nav{display:none}.brand{position:absolute;left:50%;transform:translateX(-50%);max-width:43vw}.brand .media-frame img{max-height:30px}.brand-fallback{font-size:17px;white-space:nowrap}.register-link{margin:0 0 0 auto;padding:0 11px;min-height:40px;font-size:13px}.menu-toggle{display:flex;flex-direction:column;justify-content:center;gap:5px;width:40px;height:40px;background:transparent;border:1px solid var(--border);border-radius:7px;padding:9px}.menu-toggle span{display:block;width:100%;height:2px;background:var(--nav)}.mobile-drawer{display:flex;flex-direction:column;position:fixed;z-index:102;left:0;top:0;bottom:0;width:min(86vw,340px);background:#fff;transform:translateX(-105%);visibility:hidden;pointer-events:none;transition:transform .2s,visibility .2s;overflow-y:auto;padding:18px 22px;box-shadow:8px 0 34px #0b25392b}.drawer-backdrop{display:block;position:fixed;inset:0;z-index:101;background:#09212dc0;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.drawer-open .mobile-drawer{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-open .drawer-backdrop{visibility:visible;opacity:1;pointer-events:auto}.drawer-head{display:flex;align-items:center;justify-content:space-between;padding-bottom:10px;border-bottom:1px solid var(--border)}.drawer-close{background:var(--soft);border:0;border-radius:7px;font-size:28px;width:40px;height:40px;line-height:1}.mobile-drawer a{padding:9px 10px;color:var(--head);text-decoration:none;border-radius:6px}.mobile-drawer a[aria-current]{background:var(--mint);border-left:4px solid var(--teal);font-weight:700}.drawer-label{color:var(--muted);font-size:12px;letter-spacing:.08em;margin:23px 0 4px}.mobile-bottom-links{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:23px;padding-top:15px;border-top:1px solid var(--border)}.mobile-bottom-links a{font-size:13px}.cover h1{font-size:35px}.cover{gap:20px}.section{margin-top:43px}}
@media(max-width:760px){.cover,.split,.split.wide-text,.editor-grid,.article-aside,.service-layout,.footer-layout{grid-template-columns:1fr}.cover .media-frame{max-width:680px}.split.reverse .media-frame{order:0}.service-layout>article{grid-column:1;grid-row:1}.service-layout>aside{grid-column:1;grid-row:2}.reading-flow{grid-template-columns:1fr 1fr}.gallery-grid{gap:15px}.gallery-grid .exhibit:nth-child(2){margin-top:25px}.page-shell{padding-top:15px}.section{margin-top:39px}.topic-index{column-gap:20px}}
@media(max-width:640px){body{font-size:15px}.container{width:calc(100% - 32px)}.cover{padding:29px 0 6px}.cover h1{font-size:30px}.cover p,.page-hero p,.section-lead{font-size:15.5px}.page-hero h1{font-size:27px}.page-hero{padding:24px 0 8px}.section h2,.related h2{font-size:22px}.section h3{font-size:18px}.topic-index,.gallery-grid,.reading-flow{grid-template-columns:1fr}.gallery-grid .exhibit:nth-child(2){margin-top:0}.section{margin-top:34px}.panel,.dark-panel{padding:18px}.media-frame--hero{--media-limit:205px}.media-frame--feature{--media-limit:185px}.media-frame--card{--media-limit:145px}.media-frame--mobile{--media-limit:285px;max-width:250px}.media-frame--logo{--media-limit:30px}.brand-fallback{font-size:15px}.brand-inner{gap:5px}.register-link{font-size:12px;padding:0 9px}.footer-links{grid-template-columns:1fr 1fr}.related{padding:18px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}
@media(min-width:921px){.nojs-nav{display:none}}

@media(max-width:920px){.nojs-nav{display:flex;flex-wrap:wrap;gap:5px;padding-block:8px}.nojs-nav a{padding:3px 9px;font-size:12px}}
@media(max-width:920px){body.js-enabled .nojs-nav{display:none}}