:root{--bg:#F4F7FA;--white:#fff;--soft:#EAF1F6;--cyan-soft:#E9F8F8;--navy:#102E46;--deep:#163C57;--teal:#13B8C5;--blue:#237BD3;--title:#18364B;--text:#344C60;--muted:#64798A;--line:#DCE6ED;--footer:#0B2539}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:25px}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif}a{color:#135F94;text-underline-offset:4px}a:hover{color:#087b89}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--teal);outline-offset:3px}img{max-width:100%;height:auto}button{font:inherit;cursor:pointer}.wrap,.container{width:min(1200px,calc(100% - 56px));margin-inline:auto}.reading{max-width:795px}.section{margin-block:60px}.section-heading{margin-bottom:24px}.section-heading h2{margin:0}.eyebrow{font-size:12px;letter-spacing:.14em;font-weight:800;color:#168496;text-transform:uppercase;margin:0 0 6px}h1,h2,h3{color:var(--title);line-height:1.38;letter-spacing:-.025em}h1{font-size:clamp(32px,3vw,42px);margin:0 0 20px}h2{font-size:27px;margin:0 0 18px}h3{font-size:20px;margin:0 0 12px}p{margin:0 0 17px}p:last-child{margin-bottom:0}ul,ol{padding-left:1.4em}li+li{margin-top:8px}.lead{font-size:17px;line-height:1.85}.small-note,.muted{color:var(--muted)}.skip-link{position:absolute;z-index:100;top:-100px;left:10px;background:white;padding:8px 14px}.skip-link:focus{top:10px}.site-header{background:white}.brandbar{height:72px;display:flex;align-items:center;gap:24px}.brand{text-decoration:none;color:var(--navy);display:flex;align-items:center;min-width:0}.brand-name{font-size:22px;line-height:1.1;white-space:nowrap}.brand-name small{display:block;font-size:10px;letter-spacing:2px;margin-top:3px}.brand .media-frame{padding:0;background:transparent;border:0;max-width:230px}.brand .media-frame img{max-height:38px}.brand-caption{font-size:13px;color:var(--muted);margin-right:auto}.registration-link{display:inline-flex;align-items:center;justify-content:center;min-height:39px;padding:5px 17px;color:white;background:var(--deep);text-decoration:none;border-radius:8px;font-weight:700;white-space:nowrap}.registration-link:hover{background:#126c88;color:white}.channel-nav{background:var(--navy)}.channel-nav-inner{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));align-items:stretch}.channel-nav a{min-width:0;color:#E7F4FA;text-decoration:none;text-align:center;padding:11px 4px 12px;min-height:50px;font-weight:600;font-size:15px;position:relative;white-space:nowrap}.channel-nav a:hover{background:#21465e}.channel-nav a[aria-current="page"]{font-weight:800;background:#1a425b}.channel-nav a[aria-current="page"]:after{content:"";position:absolute;width:35px;height:3px;background:var(--teal);bottom:0;left:50%;transform:translateX(-50%)}.menu-toggle{display:none;border:0;background:transparent;width:40px;height:40px;flex:0 0 40px;padding:10px}.menu-toggle span{display:block;height:2px;background:var(--navy);margin:5px 0}.mobile-drawer{position:fixed;top:0;left:0;bottom:0;width:min(86vw,340px);background:#fff;z-index:120;transform:translateX(-110%);visibility:hidden;pointer-events:none;transition:transform .24s ease,visibility .24s;overflow-y:auto;padding:20px 22px;box-shadow:10px 0 26px #0b253924}.mobile-drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;font-size:20px}.menu-close{border:0;background:var(--soft);border-radius:8px;width:42px;height:42px;font-size:28px;line-height:1}.drawer-label{color:var(--muted);font-weight:700;font-size:12px;letter-spacing:.08em;margin:18px 0 4px}.mobile-drawer a{display:block;color:var(--title);text-decoration:none;padding:10px 12px;border-radius:8px}.mobile-drawer a:hover{background:var(--soft)}.menu-backdrop{position:fixed;inset:0;background:#091e30a6;z-index:110;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.menu-backdrop.is-open{opacity:1;visibility:visible;pointer-events:auto}.drawer-open{overflow:hidden}.noscript-nav{display:flex;gap:10px;flex-wrap:wrap;padding:8px 16px;background:white}.noscript-nav a{padding:4px}.page-intro{padding:56px 0 30px}.page-intro .lead{max-width:840px}.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:14px}.breadcrumb a{color:inherit}.hero{display:grid;grid-template-columns:1.04fr .96fr;gap:36px;align-items:center;padding:62px 0 40px}.hero-copy{min-width:0}.hero h1{font-size:42px}.button-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 20px;min-height:44px;border-radius:9px;background:var(--navy);color:white;text-decoration:none;font-weight:bold}.btn:hover{background:#126c88;color:white}.btn-alt{background:#d9f2f4;color:var(--navy)}.btn-alt:hover{background:#bde9ed;color:var(--navy)}.media-frame{display:flex;align-items:center;justify-content:center;width:100%;min-width:0;padding:8px;border-radius:14px;background:var(--soft);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;margin-inline:auto}.media-frame--logo{--media-limit:38px}.media-placeholder{min-height:90px;border:1px dashed #b7cad8;color:#64798a;font-size:13px}.media-frame--hero.media-placeholder{min-height:200px}.media-frame--mobile.media-placeholder{min-height:170px}.media-placeholder span{display:block;text-align:center;padding:12px}.topic-directory{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 35px}.topic-item{display:grid;grid-template-columns:36px minmax(0,1fr);gap:15px;border-top:1px solid var(--line);padding:20px 0}.topic-item b{font-size:15px;color:#148a9b}.topic-item h3{font-size:19px;margin:0 0 7px}.topic-item p{font-size:15px;margin:0 0 8px}.focus-layout{display:grid;grid-template-columns:2fr 1fr;gap:26px}.feature-panel{padding:30px;background:white;border:1px solid var(--line);border-radius:14px}.focus-side{display:grid;gap:16px}.mini-feature{padding:22px;border-left:3px solid var(--teal);background:var(--soft)}.mini-feature h3{margin-bottom:10px}.split-media{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:36px}.split-media>*,.feature-panel,.split-media .media-frame{min-width:0}.split-media.reverse .media-frame{order:2}.stripe{background:var(--cyan-soft);padding:32px;border-top:1px solid #c9e8e8;border-bottom:1px solid #c9e8e8}.knowledge-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;align-items:start}.knowledge-three article{padding:22px;background:white;border:1px solid var(--line);border-radius:12px}.knowledge-three article:nth-child(2){margin-top:23px}.knowledge-three article:nth-child(3){margin-top:46px}.step-path{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.step-path article{padding:19px;border-top:3px solid var(--teal);background:white}.step-path b,.number-tag{display:inline-flex;background:var(--navy);color:white;border-radius:50%;align-items:center;justify-content:center;width:33px;height:33px;font-size:14px;margin-bottom:12px}.editor-note{padding:24px 28px;border-left:4px solid var(--teal);background:var(--soft)}.anchor-nav{display:flex;gap:12px;flex-wrap:wrap;margin:0 auto 32px}.anchor-nav a{padding:7px 15px;border:1px solid #c2d9e6;border-radius:99px;background:white;text-decoration:none;font-weight:600}.article-section{margin-block:40px}.article-section>h2{padding-bottom:10px;border-bottom:1px solid var(--line)}.article-layout{display:grid;grid-template-columns:minmax(0,2.2fr) minmax(210px,.8fr);gap:32px;align-items:start}.fact-rail{background:#e9f3f7;padding:23px;border-radius:12px;font-size:14px}.fact-rail h2{font-size:20px}.fact-rail a{display:block;margin:9px 0}.compare{overflow-x:auto;max-width:100%;border:1px solid var(--line);border-radius:12px;background:white}table{border-collapse:collapse;width:100%;font-size:15px;min-width:540px}caption{text-align:left;font-weight:bold;color:var(--title);padding:15px}th,td{padding:13px 15px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}th{background:#e9f3f7;color:var(--title)}tbody tr:last-child td{border-bottom:0}.sequence{counter-reset:seq;list-style:none;padding:0}.sequence li{position:relative;padding:0 0 25px 58px;border-left:1px solid #b6d8de;margin-left:17px;min-height:70px}.sequence li:before{counter-increment:seq;content:counter(seq);position:absolute;left:-18px;top:0;width:35px;height:35px;display:grid;place-items:center;background:var(--deep);color:white;border-radius:50%;font-weight:bold}.sequence li:last-child{border-left-color:transparent}.sequence h3{margin:0 0 7px}.note-box{padding:22px 26px;background:var(--cyan-soft);border-radius:12px;border-left:4px solid var(--teal)}.term-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.term-grid article{background:white;padding:20px;border:1px solid var(--line);border-radius:10px}.exhibit{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center;margin:32px 0}.exhibit:nth-of-type(even) .media-frame{order:2}.exhibit>div{min-width:0}.rule-manual{max-width:900px}.rule-manual .article-section{background:white;padding:28px;border:1px solid var(--line);border-radius:12px}.faq details{border-bottom:1px solid var(--line);padding:14px 4px}.faq summary{cursor:pointer;font-weight:700;color:var(--title)}.faq details p{padding-top:12px}.service-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:40px}.service-sidebar{padding:22px;background:white;border:1px solid var(--line);border-radius:12px;align-self:start}.service-sidebar a{display:block;padding:6px 0}.related{padding-top:26px;border-top:1px solid var(--line)}.related-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.related-link{display:block;padding:20px;border-radius:10px;background:#e5f2f7;text-decoration:none;font-weight:700}.related-link:after{content:' →'}.mobile-shortcuts{display:none}.site-footer{background:var(--footer);color:#dcecf5;padding:48px 0 20px;margin-top:65px}.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:42px}.site-footer h2{color:white;font-size:18px}.site-footer a{color:#b2e6ef}.footer-brand{font-size:24px;text-decoration:none;font-weight:800;color:white!important}.footer-brand span{display:block;font-size:11px;letter-spacing:2px}.footer-grid p{font-size:14px}.footer-links{display:grid;grid-template-columns:1fr 1fr;gap:4px 12px}.footer-bottom{border-top:1px solid #355166;padding-top:15px;margin-top:35px;display:flex;justify-content:space-between;font-size:13px}.back-top{position:fixed;right:18px;bottom:18px;background:var(--navy);color:white;width:42px;height:42px;border:0;border-radius:50%;box-shadow:0 4px 18px #102e4633}.back-top[hidden]{display:none}blockquote{margin:24px 0;padding:20px 25px;border-left:4px solid var(--teal);background:var(--soft);font-size:18px;color:var(--deep)}
@media(max-width:1200px){.wrap,.container{width:calc(100% - 44px)}.hero{gap:25px}.section{margin-block:50px}}@media(max-width:920px){.brandbar{height:64px;display:grid;grid-template-columns:40px minmax(0,1fr) auto;gap:8px}.menu-toggle{display:block}.brand{justify-content:center;overflow:hidden}.brand-name{font-size:19px}.brand .media-frame img{max-height:30px}.brand-caption,.channel-nav{display:none}.registration-link{min-height:38px;padding:5px 12px;font-size:13px}.footer-grid{gap:25px}}@media(max-width:760px){.hero,.split-media,.focus-layout,.article-layout,.service-layout,.exhibit{grid-template-columns:1fr}.hero{padding:35px 0 20px}.split-media.reverse .media-frame,.exhibit:nth-of-type(even) .media-frame{order:initial}.topic-directory,.term-grid{grid-template-columns:1fr 1fr}.step-path{grid-template-columns:1fr 1fr}.knowledge-three{grid-template-columns:1fr 1fr}.knowledge-three article:nth-child(3){margin-top:0}.fact-rail{order:2}.service-sidebar{order:2}.related-links{grid-template-columns:1fr 1fr}.page-intro{padding:34px 0 18px}}@media(max-width:640px){body{font-size:15px;line-height:1.78}.wrap,.container{width:calc(100% - 32px)}h1,.hero h1{font-size:29px}h2{font-size:22px}h3{font-size:18px}.lead{font-size:16px}.section{margin-block:36px}.hero{gap:20px}.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-frame--logo{--media-limit:30px}.topic-directory,.knowledge-three,.term-grid,.step-path,.related-links{grid-template-columns:1fr}.knowledge-three article:nth-child(2),.knowledge-three article:nth-child(3){margin-top:0}.feature-panel,.stripe,.rule-manual .article-section{padding:18px}.related-link{padding:14px 18px}.mobile-shortcuts{display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap;padding:20px 0 0;font-size:13px}.footer-grid{grid-template-columns:1fr}.footer-bottom{display:block}.footer-bottom span{display:block}.section-heading{margin-bottom:15px}.brand-name{font-size:17px}.brand-name small{font-size:8px}}@media(max-width:380px){.brand-name{font-size:16px}.registration-link{font-size:12px;padding:5px 8px}.brandbar{gap:4px}.button-row .btn{font-size:14px;padding:9px 13px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation-duration:.01ms!important;transition-duration:.01ms!important}}