:root{--bg:#F4F7FA;--surface:#fff;--soft:#EAF1F6;--aqua:#E9F8F8;--navy:#102E46;--deep:#163C57;--brand:#13B8C5;--blue:#237BD3;--title:#18364B;--text:#344C60;--muted:#64798A;--border:#DCE6ED;--footer:#0B2539;--width:1200px}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:20px}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif;overflow-wrap:break-word}body.menu-open{overflow:hidden}a{color:#176ca9;text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #237BD3;outline-offset:3px}img{max-width:100%;height:auto}h1,h2,h3{color:var(--title);line-height:1.38;letter-spacing:-.025em}h1{font-size:clamp(2rem,3vw,2.75rem);margin:0 0 22px}h2{font-size:clamp(1.48rem,2.1vw,1.75rem);margin:0 0 21px}h3{font-size:1.22rem;margin:0 0 12px}p{margin:0 0 18px}ul,ol{padding-left:1.4em;margin:12px 0 22px}li{margin:6px 0}strong{color:var(--title)}.wrap{width:min(calc(100% - 56px),var(--width));margin-inline:auto}.reading{max-width:790px}.eyebrow{font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;font-weight:700;color:#16758b;display:block;margin-bottom:14px}.section{margin-block:58px}.section-slim{margin-block:36px}.lead{font-size:1.1rem;line-height:1.82;color:#425f72}.minor{font-size:.89rem;color:var(--muted)}.skip-link{position:absolute;left:10px;top:-70px;background:white;padding:12px;z-index:100}.skip-link:focus{top:10px}
.site-header{background:var(--navy);color:#fff}.brand-bar{background:var(--navy)}.brand-bar-inner{min-height:72px;display:flex;align-items:center;gap:20px}.brand{display:flex;align-items:center;flex-shrink:0;color:white}.brand img{display:block;width:auto;height:auto;max-height:38px;max-width:230px;object-fit:contain}.brand-name{font-size:1.5rem;line-height:1.15;color:white;white-space:nowrap}.brand-name small{display:block;font-size:.5rem;letter-spacing:.12em}.brand-tagline{font-size:.78rem;color:#bdd1dc;margin-right:auto}.entry-link{margin-left:auto;color:#062c37;background:#2ad3d6;border-radius:7px;padding:7px 17px;white-space:nowrap;font-weight:700;min-height:42px;display:inline-flex;align-items:center;justify-content:center}.entry-link:hover{background:#75e4e4;text-decoration:none}.desktop-nav{background:#163C57;border-top:1px solid #325266}.nav-grid{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:4px}.desktop-nav a{text-align:center;padding:12px 4px;color:#e1eff6;font-size:.92rem;white-space:nowrap;border-bottom:3px solid transparent;font-weight:500}.desktop-nav a:hover{color:white;text-decoration:none;background:#214b67}.desktop-nav a.is-active{border-bottom-color:#2dd5d4;color:white;font-weight:700}.menu-toggle{display:none}.mobile-drawer,.drawer-backdrop{display:none}
.hero{padding:64px 0 54px}.hero-grid,.feature-split,.article-split,.two-col{display:grid;grid-template-columns:1.08fr .92fr;gap:44px;align-items:center}.hero h1{font-size:clamp(2.1rem,3.1vw,2.75rem);max-width:660px}.hero-copy p{max-width:650px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 21px;background:var(--navy);color:white;border-radius:9px;font-weight:700}.btn:hover{background:#215678;text-decoration:none}.btn-ghost{background:white;border:1px solid #b9d6e1;color:#11506e}.btn-ghost:hover{color:white}.media-frame{margin:0;min-width:0;display:flex;align-items:center;justify-content:center;width:100%;padding:9px;border:1px solid var(--border);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--wide{--media-limit:210px}.media-frame--mobile{--media-limit:350px;max-width:320px;margin:auto}.media-missing{min-height:95px;width:100%;display:flex;align-items:center;justify-content:center;color:#6b8293;background:#e1edf3;border:1px dashed #b6cedc;border-radius:9px;font-size:.87rem}.media-frame--hero .media-missing{min-height:180px}
.band{background:white;border-block:1px solid var(--border);padding:52px 0}.band-aqua{background:var(--aqua);padding:44px 0}.band-dark{background:var(--deep);color:#e8f5f8;padding:45px 0}.band-dark h2,.band-dark h3,.band-dark strong{color:white}.band-dark a{color:#93ecf2}.section-head{max-width:780px;margin-bottom:22px}.section-head p{color:var(--muted)}.topic-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 40px}.topic-item{border-top:1px solid #c7d9e3;padding:22px 0}.topic-item h3{margin-bottom:8px}.topic-item p{margin-bottom:8px}.topic-item a{font-weight:700}.editorial-grid{display:grid;grid-template-columns:2fr 1fr;gap:26px;align-items:stretch}.focus-main{padding:32px;background:var(--deep);color:#e3f0f6;border-radius:14px}.focus-main h3{font-size:1.55rem;color:white}.focus-main a{color:#b0f7f2;font-weight:700}.focus-side{display:flex;flex-direction:column;gap:18px}.mini-story{padding:24px;background:white;border:1px solid var(--border);border-radius:12px;flex:1}.mini-story h3{font-size:1.1rem}.numbered-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.numbered-grid article{padding:24px;border-left:3px solid var(--brand);background:white}.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;list-style:none;padding:0;counter-reset:step}.steps li{background:var(--soft);border-top:3px solid var(--brand);padding:22px 18px;counter-increment:step}.steps li::before{content:'0' counter(step);display:block;color:#167b87;font-weight:800;font-size:1.4rem}.steps a{display:block;font-weight:700;margin-top:10px}
.page-head{padding:38px 0 24px;border-bottom:1px solid var(--border);background:white}.page-head h1{font-size:clamp(2rem,2.65vw,2.25rem)}.page-head .lead{max-width:900px}.crumbs{display:flex;gap:10px;font-size:.82rem;color:var(--muted);margin-bottom:17px}.crumbs a{color:#206a92}.anchor-nav{display:flex;gap:10px;flex-wrap:wrap;padding:16px 0}.anchor-nav a{padding:6px 14px;background:white;border:1px solid var(--border);border-radius:25px;font-weight:700;font-size:.91rem}.page-grid{display:grid;grid-template-columns:minmax(0,1fr) 255px;gap:42px;align-items:start}.chapter{margin-bottom:46px;scroll-margin-top:24px}.chapter>h2{border-bottom:1px solid var(--border);padding-bottom:13px}.side-note{padding:20px;background:var(--aqua);border-left:3px solid var(--brand);font-size:.93rem}.side-note h3{font-size:1.02rem}.side-note ul{margin-bottom:0}.note{background:var(--aqua);border-left:4px solid var(--brand);padding:20px 25px;margin:24px 0}.article-wide{max-width:960px}.prose-block{max-width:790px}.article-split{grid-template-columns:minmax(0,1fr) minmax(0,.8fr);align-items:start}.article-split.reverse{grid-template-columns:minmax(0,.8fr) minmax(0,1fr)}.columns-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}.columns-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.info-block{border-top:2px solid var(--brand);padding:20px 4px}.info-block p{margin-bottom:0}.table-scroll{overflow-x:auto;max-width:100%;border:1px solid var(--border);border-radius:10px;background:white;margin:24px 0}table{border-collapse:collapse;width:100%;min-width:590px;font-size:.93rem}caption{text-align:left;padding:14px 18px;font-weight:700;color:var(--title)}th,td{border-bottom:1px solid var(--border);text-align:left;vertical-align:top;padding:13px 17px}th{background:var(--soft);color:var(--title)}tbody tr:last-child td{border-bottom:0}.process{list-style:none;padding:0;counter-reset:item}.process li{counter-increment:item;border-left:2px solid #b6d7df;padding:4px 0 24px 28px;position:relative}.process li::before{content:counter(item);position:absolute;left:-15px;top:0;background:var(--navy);color:#fff;width:28px;height:28px;border-radius:50%;display:grid;place-items:center;font-weight:bold;font-size:.9rem}.process li:last-child{border-left-color:transparent}.process strong{display:block;margin-bottom:7px}.project-matrix{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.project-matrix article{padding:24px;background:white;border:1px solid var(--border);border-top:4px solid var(--brand);border-radius:8px}.project-matrix article:nth-child(2){border-top-color:var(--blue)}.project-matrix article:nth-child(3){border-top-color:var(--navy)}.gallery-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}.exhibit{margin:0 0 22px}.exhibit figcaption{font-size:.95rem;padding:13px 5px 0}.exhibit h3{margin:0 0 8px}.exhibit:nth-child(2){margin-top:55px}.rule-index{background:white;border:1px solid var(--border);border-radius:12px;padding:25px}.rule-index a{display:block;padding:9px 0;border-bottom:1px solid var(--border);font-weight:700}.rule-index a:last-child{border-bottom:0}.faq-list details{margin:0 0 10px;background:white;border:1px solid var(--border);border-radius:10px}.faq-list summary{cursor:pointer;padding:15px 20px;font-weight:700;color:var(--title)}.faq-list details[open] summary{border-bottom:1px solid var(--border)}.faq-list details p{padding:16px 20px;margin:0}.related{margin:55px 0;border-top:1px solid #bdd0dc;padding-top:24px}.related-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.related-links a{display:block;background:white;border:1px solid var(--border);padding:17px;border-radius:9px;font-weight:700}.related-links a:hover{border-color:var(--brand)}.service-layout{display:grid;grid-template-columns:250px minmax(0,1fr);gap:46px}.service-nav{background:white;border:1px solid var(--border);border-radius:10px;padding:20px;height:max-content}.service-nav a{display:block;padding:6px 0}.service-article{min-width:0}.site-footer{background:var(--footer);color:#dcecf5;padding:43px 0 18px}.footer-inner{display:grid;grid-template-columns:2fr 1fr;gap:60px}.footer-inner p{color:#c2d4de;font-size:.89rem;max-width:730px}.footer-brand{font-size:1.3rem;color:white;font-weight:bold}.footer-brand span{display:block;font-size:.6rem;letter-spacing:.2em}.footer-inner nav{display:grid;grid-template-columns:repeat(2,1fr);gap:8px 20px;align-content:start}.footer-inner a{color:#d8f1f5}.footer-bottom{font-size:.76rem;color:#9eb6c4;border-top:1px solid #345064;padding-top:16px;margin-top:23px}.mobile-shortcuts{display:none}
@media(max-width:1100px){.wrap{width:calc(100% - 44px)}.hero-grid,.feature-split{gap:28px}.nav-grid{gap:0}.desktop-nav a{font-size:.84rem}}
@media(max-width:920px){.brand-bar-inner{min-height:62px;display:grid;grid-template-columns:40px minmax(0,1fr) auto;gap:8px}.brand{justify-self:center;max-width:100%;min-width:0}.brand img{max-height:30px;max-width:min(37vw,200px)}.brand-name{font-size:1.2rem}.brand-tagline,.desktop-nav{display:none}.entry-link{font-size:.83rem;padding:6px 11px;min-height:40px;margin:0}.menu-toggle{width:40px;height:40px;border:1px solid #52758a;background:transparent;display:flex;flex-direction:column;gap:5px;justify-content:center;align-items:center;border-radius:7px;cursor:pointer}.menu-toggle span{width:18px;height:2px;background:white}.drawer-backdrop{display:block;position:fixed;inset:0;background:rgba(6,28,42,.6);z-index:30;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.drawer-backdrop.is-open{opacity:1;visibility:visible;pointer-events:auto}.mobile-drawer{display:block;position:fixed;top:0;bottom:0;left:0;width:min(86vw,340px);padding:19px 24px;background:#fff;z-index:31;transform:translateX(-105%);visibility:hidden;pointer-events:none;overflow-y:auto;transition:transform .23s,visibility .23s;box-shadow:0 8px 30px #102e4633}.mobile-drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-top{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--border);padding-bottom:14px;margin-bottom:15px}.drawer-close{border:1px solid var(--border);background:white;font-size:1.6rem;width:40px;height:40px;border-radius:8px;cursor:pointer;line-height:1}.drawer-group-label{font-size:.77rem;color:var(--muted);font-weight:700;margin:19px 0 4px}.mobile-drawer a{display:block;padding:10px 8px;color:var(--title);border-radius:6px}.mobile-drawer a.is-active{background:var(--aqua);border-left:3px solid var(--brand);font-weight:700}.mobile-shortcuts{display:flex;gap:12px;flex-wrap:wrap;padding-block:24px;font-size:.84rem}.mobile-shortcuts a{padding:6px 10px;background:white;border:1px solid var(--border);border-radius:5px}.page-grid{grid-template-columns:minmax(0,1fr) 210px;gap:25px}}
@media(max-width:760px){.hero-grid,.feature-split,.article-split,.article-split.reverse,.two-col,.page-grid,.service-layout{grid-template-columns:1fr}.hero{padding:38px 0}.hero-grid{gap:25px}.hero-grid .media-frame{order:1}.editorial-grid{grid-template-columns:1fr}.focus-side{display:grid;grid-template-columns:repeat(2,1fr)}.numbered-grid,.project-matrix{grid-template-columns:1fr}.columns-3{grid-template-columns:repeat(2,1fr)}.steps{grid-template-columns:repeat(2,1fr)}.service-article{order:0}.service-nav{order:1}.section{margin-block:40px}.band{padding:40px 0}.page-head{padding:26px 0 20px}.related-links{grid-template-columns:1fr}.footer-inner{gap:30px}}
@media(max-width:640px){.wrap{width:calc(100% - 32px)}body{font-size:15.5px}.hero h1{font-size:clamp(1.72rem,7vw,2rem)}h1{font-size:1.85rem}.page-head h1{font-size:1.68rem}h2{font-size:1.32rem}h3{font-size:1.11rem}.topic-grid,.columns-2,.gallery-grid,.focus-side,.columns-3{grid-template-columns:1fr}.gallery-grid .exhibit:nth-child(2){margin-top: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--mobile{--media-limit:285px;max-width:250px}.section{margin-block:34px}.lead{font-size:1.02rem}.focus-main,.mini-story,.numbered-grid article{padding:19px}.brand img{max-width:36vw;max-height:28px}.brand-name{font-size:1rem}.entry-link{font-size:.75rem;padding:5px 8px}.footer-inner{grid-template-columns:1fr}.footer-inner nav{grid-template-columns:repeat(3,1fr)}.steps{grid-template-columns:1fr}.hero-actions{gap:9px}.btn{font-size:.88rem;padding:9px 14px}.anchor-nav a{font-size:.81rem}.table-scroll{margin-inline:0}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}