:root{--bg:#F4F7FA;--white:#fff;--pale:#EAF1F6;--mint:#E9F8F8;--nav:#102E46;--dark:#163C57;--aqua:#13B8C5;--blue:#237BD3;--title:#18364B;--body:#344C60;--muted:#64798A;--line:#DCE6ED;--footer:#0B2539;--reading:780px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--bg);color:var(--body);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif;overflow-wrap:break-word}a{color:#1264A6;text-underline-offset:3px}a:hover{color:#0B6072}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--aqua);outline-offset:3px}img{max-width:100%;height:auto}h1,h2,h3,h4,p,ul,ol{margin-top:0}h1,h2,h3{color:var(--title);line-height:1.38}h1{font-size:clamp(2rem,3vw,2.25rem)}h2{font-size:clamp(1.4rem,2.2vw,1.75rem)}h3{font-size:1.25rem}p{margin-bottom:1.15em}section{scroll-margin-top:25px}.shell{width:min(100% - 56px,1200px);margin-inline:auto}.reading{max-width:var(--reading)}.eyebrow{display:inline-block;color:#087A87;font-size:.8rem;font-weight:750;letter-spacing:.11em;text-transform:uppercase;margin-bottom:14px}.muted{color:var(--muted)}.kicker{font-weight:700;color:#237BD3;font-size:.84rem;letter-spacing:.06em}.section{margin-block:60px}.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:25px}.section-head h2{margin:0}.section-intro{max-width:800px}.lead{font-size:1.08rem;color:#40596E}.button-link{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:9px 21px;border-radius:9px;background:var(--dark);color:white;text-decoration:none;font-weight:700}.button-link:hover{color:white;background:#245779}.button-link--outline{background:white;border:1px solid #C0D2E0;color:var(--title)}.button-link--outline:hover{background:var(--pale);color:var(--title)}.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}.text-link{font-weight:700;text-decoration:none;border-bottom:1px solid var(--aqua);padding-bottom:3px}
.skip-link{position:absolute;top:-100px;left:16px;z-index:100;background:#fff;padding:12px}.skip-link:focus{top:8px}.site-header{position:relative;z-index:20}.brand-bar{background:#fff;border-bottom:1px solid var(--line)}.brand-inner{height:72px;display:flex;align-items:center;gap:20px;min-width:0}.brand{display:flex;align-items:center;text-decoration:none;color:var(--title);min-width:0;flex:0 1 auto}.brand img{display:block;width:auto;height:auto;max-height:38px;max-width:min(270px,100%);object-fit:contain}.brand-fallback{font-size:1.55rem;line-height:1.08;white-space:nowrap;color:var(--nav);font-weight:850}.brand-en{display:block;font-size:.53rem;letter-spacing:.2em}.brand-desc{font-size:.83rem;color:var(--muted);white-space:nowrap}.brand-desc b{color:#A4BAC7;padding-inline:4px}.entry-link{margin-left:auto;text-decoration:none;color:white;background:var(--dark);border-radius:8px;padding:9px 18px;font-size:.91rem;font-weight:700;white-space:nowrap}.entry-link:hover{color:white;background:#245A77}.desktop-nav{background:var(--nav)}.nav-inner{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));align-items:stretch;min-height:50px}.nav-link{text-align:center;color:#E5F4FB;font-size:.93rem;display:flex;align-items:center;justify-content:center;position:relative;text-decoration:none;font-weight:600;white-space:nowrap;padding:8px 4px}.nav-link:hover{background:#1B4968;color:white}.nav-link[aria-current=page]{color:white;font-weight:800}.nav-link[aria-current=page]:after{content:"";height:3px;background:var(--aqua);position:absolute;bottom:0;left:22%;right:22%}.menu-toggle,.nojs-nav,.mobile-drawer,.drawer-backdrop{display:none}
main{min-height:60vh}.breadcrumbs{display:flex;align-items:center;gap:10px;padding-top:23px;font-size:.84rem;color:var(--muted)}.breadcrumbs a{color:#547083;text-decoration:none}.page-intro{padding:27px 0 26px}.page-intro h1{max-width:1000px;margin:0 0 15px}.page-intro p{max-width:860px}.page-intro--panel{background:#fff;border-bottom:1px solid var(--line)}.page-intro--panel .breadcrumbs{padding-top:23px}.topic-nav{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}.topic-nav a{border:1px solid #C8D9E3;background:#fff;text-decoration:none;border-radius:6px;padding:5px 13px;font-size:.91rem;font-weight:700}.content-section{margin-block:45px}.content-section h2{margin-bottom:17px}.content-section h3{margin:28px 0 9px}.content-section p{max-width:850px}.prose{max-width:780px}.prose p{line-height:1.83}.band{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:48px 0}.pale-band{background:var(--pale);padding:38px;border-radius:15px}.dark-band{background:var(--nav);color:#E8F5FB;border-radius:14px;padding:35px}.dark-band h2,.dark-band h3{color:#fff}.pill{display:inline-block;background:#DCF3F3;color:#086977;padding:3px 10px;border-radius:4px;font-size:.76rem;font-weight:750}
.media-frame{display:flex;align-items:center;justify-content:center;min-width:0;width:100%;max-width:100%;margin:0;background:var(--pale);border-radius:14px;padding:9px;--media-limit:220px}.media-frame img{display:block;width:auto;height:auto;max-width:100%;max-height:var(--media-limit);object-fit:contain;object-position:center}.media-placeholder{display:flex;align-items:center;justify-content:center;min-height:110px;width:100%;color:#7892A6;border:1px dashed #B4C9D7;border-radius:9px;font-size:.88rem;background:linear-gradient(130deg,#EAF1F6,#F4F8FA)}.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}.media-frame--banner{--media-limit:210px}.media-frame--rules{--media-limit:220px}.media-frame--logo{--media-limit:38px}
.cover{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,1fr);gap:48px;align-items:center;padding-top:51px;padding-bottom:44px}.cover>*{min-width:0}.cover h1{font-size:clamp(2.05rem,3.6vw,2.75rem);margin:4px 0 20px;letter-spacing:-.015em}.cover p{max-width:570px}.directory-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 40px}.directory-item{padding:20px 0;border-top:1px solid var(--line)}.directory-item h3{font-size:1.1rem;margin:0 0 8px}.directory-item p{font-size:.94rem;color:var(--muted);margin:0 0 7px}.directory-item a{font-weight:700;text-decoration:none}.editorial-feature{display:grid;grid-template-columns:minmax(0,2fr) minmax(245px,1fr);gap:26px}.feature-main{background:#fff;padding:34px;border-left:5px solid var(--aqua)}.feature-side{display:grid;gap:18px}.feature-side article{border-top:2px solid var(--line);padding:16px 0}.feature-side h3{margin:0 0 7px}.split{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:34px;align-items:center}.split>*{min-width:0}.split--text-heavy{grid-template-columns:minmax(0,1.35fr) minmax(0,1fr)}.article-columns{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:38px;align-items:start}.article-columns>*{min-width:0}.fact-index{background:#fff;border:1px solid var(--line);padding:23px;border-radius:12px}.fact-index h3{font-size:1rem}.fact-index ul{margin:0;padding-left:20px;font-size:.89rem}.fact-index li{margin-bottom:8px}.mini-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.mini-grid article{padding:20px;background:#fff;border:1px solid var(--line);border-radius:10px}.mini-grid h3{margin-bottom:9px}.mini-grid p{margin-bottom:0}.steps{counter-reset:steps;display:grid;gap:14px;padding:0;list-style:none}.steps li{counter-increment:steps;position:relative;padding:17px 20px 17px 66px;background:#fff;border:1px solid var(--line);border-radius:10px}.steps li:before{content:counter(steps,decimal-leading-zero);position:absolute;left:18px;top:17px;font-weight:800;color:#00899B;font-size:1.15rem}.steps li strong{display:block;color:var(--title)}.table-scroll{overflow-x:auto;max-width:100%;border:1px solid var(--line);border-radius:12px;background:#fff}table{border-collapse:collapse;width:100%;min-width:560px;line-height:1.65}caption{text-align:left;font-weight:800;color:var(--title);padding:14px 16px}th,td{text-align:left;vertical-align:top;border-bottom:1px solid var(--line);padding:14px 16px}th{background:#EAF1F6;color:var(--title);font-size:.9rem}tr:last-child td{border-bottom:0}.read-more{display:inline-block;font-weight:700;margin-top:5px}.quote{border-left:4px solid var(--aqua);padding:12px 22px;background:var(--mint);margin:28px 0;color:var(--title)}.reading-path{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.reading-path a{background:#fff;padding:19px;border-top:3px solid var(--aqua);text-decoration:none;color:var(--title);font-weight:750}.reading-path a small{display:block;color:var(--muted);font-weight:400;margin-top:8px}.knowledge-stack{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));align-items:start;gap:19px}.knowledge-stack article{padding:24px;background:#fff;border:1px solid var(--line)}.knowledge-stack article:nth-child(2){margin-top:28px}.knowledge-stack article:nth-child(3){margin-top:55px}
.rule-toc{max-width:790px;background:var(--white);border-left:4px solid var(--aqua);padding:18px 25px}.rule-toc ol{margin-bottom:0}.rule-toc li{margin:7px 0}.exhibition{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:36px}.exhibit{min-width:0}.exhibit:nth-child(even){margin-top:46px}.exhibit h3{margin-top:17px}.exhibit p{font-size:.96rem}.faq-list{display:grid;gap:10px;max-width:850px}.faq-list details{background:#fff;border:1px solid var(--line);border-radius:9px;padding:0 18px}.faq-list summary{padding:15px 0;color:var(--title);cursor:pointer;font-weight:750}.faq-list details p{margin:0 0 17px;color:var(--body)}.service-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:43px;align-items:start}.service-layout>*{min-width:0}.service-menu{position:sticky;top:20px;background:#fff;padding:20px;border:1px solid var(--line);border-radius:12px}.service-menu a{display:block;padding:7px 0;text-decoration:none;border-bottom:1px solid var(--line);font-size:.91rem}.service-menu a:last-child{border:0}.service-article .content-section:first-child{margin-top:0}.related-reading{padding:30px 0 45px;margin-top:55px;border-top:2px solid var(--line)}.related-reading h2{font-size:1.38rem}.related-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.related-list a{display:flex;justify-content:space-between;gap:10px;background:#fff;padding:15px 18px;border:1px solid var(--line);text-decoration:none;color:var(--title);font-weight:700}.related-list span{color:#0B91A3}.mobile-shortcuts{display:none}.site-footer{background:var(--footer);color:#DCECF5;padding-top:45px;font-size:.9rem}.footer-grid{display:grid;grid-template-columns:2fr 1fr;gap:50px}.footer-grid p{max-width:690px;color:#B7CDD9}.footer-brand{font-size:1.25rem;font-weight:800}.footer-brand small{font-size:.65rem;letter-spacing:.08em;margin-left:7px;color:#8DDDE5}.footer-grid h2{color:#fff;font-size:1rem}.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:3px 12px}.footer-grid a,.footer-bottom a{color:#DCECF5;text-decoration:none}.footer-grid a:hover,.footer-bottom a:hover{color:#6CE0E9}.footer-bottom{border-top:1px solid #315165;padding:17px 0;display:flex;justify-content:space-between;gap:20px;color:#B7CDD9;font-size:.8rem}
@media(max-width:1050px){.brand-desc{font-size:.73rem}.shell{width:min(100% - 44px,1200px)}.cover{gap:30px}.nav-link{font-size:.84rem}}
@media(max-width:920px){.desktop-nav{display:none}.brand-inner{height:62px;justify-content:space-between;gap:10px}.brand{position:absolute;left:50%;transform:translateX(-50%);max-width:calc(100% - 215px);justify-content:center}.brand img{max-width:100%;max-height:30px}.brand-fallback{font-size:1.12rem}.brand-en{font-size:.43rem}.brand-desc{display:none}.entry-link{margin-left:auto;font-size:.78rem;padding:8px 11px;min-height:39px;display:flex;align-items:center}.menu-toggle{display:flex;border:1px solid var(--line);background:white;width:40px;height:40px;padding:9px;flex-direction:column;justify-content:space-around;align-items:center;border-radius:7px;cursor:pointer}.menu-toggle span{background:var(--nav);height:2px;width:20px}.mobile-drawer{display:block;position:fixed;top:0;bottom:0;left:0;width:min(86vw,340px);background:#fff;z-index:35;transform:translateX(-105%);visibility:hidden;pointer-events:none;overflow-y:auto;transition:transform .2s ease,visibility .2s;padding:19px 22px;box-shadow:6px 0 22px rgba(0,0,0,.12)}.drawer-backdrop{display:block;position:fixed;inset:0;background:rgba(4,21,34,.53);opacity:0;visibility:hidden;pointer-events:none;z-index:30;transition:opacity .2s}.menu-open .mobile-drawer{transform:translateX(0);visibility:visible;pointer-events:auto}.menu-open .drawer-backdrop{visibility:visible;opacity:1;pointer-events:auto}.drawer-title{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:13px;font-size:1.15rem;color:var(--title)}.drawer-close{border:1px solid var(--line);background:white;width:40px;height:40px;font-size:1.7rem;cursor:pointer;border-radius:6px}.drawer-section{margin-top:19px}.drawer-section p{font-size:.76rem;font-weight:800;color:#698194;letter-spacing:.1em;margin:0 0 8px}.drawer-section a{display:block;padding:10px 5px;text-decoration:none;color:var(--title);border-bottom:1px solid var(--line);font-weight:650}.drawer-section a[aria-current=page]{border-left:3px solid var(--aqua);padding-left:10px;background:var(--mint)}.nojs-nav{display:none}.mobile-shortcuts{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;padding:22px 0}.mobile-shortcuts a{font-size:.85rem;text-decoration:none;font-weight:700}.brand-bar{position:relative}}
@media(max-width:760px){.article-columns,.service-layout,.split,.split--text-heavy,.editorial-feature,.footer-grid{grid-template-columns:1fr}.service-article{order:0}.service-menu{order:1;position:static}.fact-index{margin-top:0}.cover{grid-template-columns:1fr}.cover .media-frame{order:1}.cover>div{order:0}.section{margin-block:43px}.content-section{margin-block:35px}.exhibition{gap:21px}.footer-grid{gap:12px}.reading-path{grid-template-columns:repeat(2,minmax(0,1fr))}.related-list{grid-template-columns:1fr}}
@media(max-width:640px){body{font-size:15px;line-height:1.78}.shell{width:calc(100% - 32px)}h1{font-size:1.7rem}h2{font-size:1.38rem}h3{font-size:1.13rem}.cover{padding-top:35px;padding-bottom:27px;gap:20px}.cover h1{font-size:clamp(1.72rem,7vw,2rem)}.directory-grid,.mini-grid,.knowledge-stack,.exhibition{grid-template-columns:1fr}.directory-item{padding:16px 0}.knowledge-stack article:nth-child(2),.knowledge-stack article:nth-child(3),.exhibit:nth-child(even){margin-top:0}.pale-band,.dark-band{padding:22px}.band{padding:32px 0}.feature-main{padding:23px}.section-head{align-items:start}.steps li{padding:15px 13px 15px 58px}.steps li:before{left:13px}.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--banner{--media-limit:135px}.media-frame--rules{--media-limit:175px}.related-reading{margin-top:32px}.entry-link{max-width:91px}.footer-bottom{flex-direction:column;gap:3px}.brand{max-width:calc(100% - 178px)}.page-intro{padding:17px 0 14px}}
@media(max-width:380px){.brand img{max-height:27px}.brand-fallback{font-size:.98rem}.brand-en{font-size:.37rem}.entry-link{font-size:.72rem;padding-inline:8px}.brand-inner{gap:5px}.reading-path{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
@media(min-width:921px){.nojs-nav{display:none}}
@media(max-width:920px){.nojs-nav{display:flex;flex-wrap:wrap;gap:10px;padding-block:10px;background:#fff}.nojs-nav a{font-size:.8rem}.js-enabled .nojs-nav{display:none}}