:root{--bg:#F4F7FA;--paper:#fff;--muted:#EAF1F6;--aqua:#E9F8F8;--navy:#102E46;--ink:#18364B;--text:#344C60;--sub:#64798A;--rule:#DCE6ED;--brand:#13B8C5;--blue:#237BD3;--footer:#0B2539}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--text);font-size:16px;line-height:1.8}a{color:#1261a0;text-underline-offset:4px}a:hover{color:#087887}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--brand);outline-offset:3px}button{font:inherit;cursor:pointer}img{max-width:100%;height:auto}h1,h2,h3{color:var(--ink);line-height:1.4;letter-spacing:.01em}h1{font-size:35px;margin:0 0 19px}h2{font-size:27px;margin:0 0 18px}h3{font-size:20px;margin:0 0 12px}p{margin:0 0 17px}section,article,aside,div{min-width:0}strong{color:var(--ink)}.content-width{max-width:1200px;margin-inline:auto;padding-inline:28px}.section-space{margin-block:62px}.lead{font-size:17px;max-width:790px}.small-text{font-size:14px;color:var(--sub)}.eyebrow{font-size:13px;color:#087b86;letter-spacing:.14em;font-weight:700;text-transform:uppercase}.site-header{background:#fff;border-bottom:1px solid var(--rule)}.masthead{height:72px;display:flex;align-items:center;gap:22px}.brand{text-decoration:none;color:var(--navy);display:flex;align-items:center;white-space:nowrap}.brand-logo strong{font-size:22px;letter-spacing:.05em}.brand-logo em{color:#168c98;font-style:normal}.brand-logo .media-frame{padding:0;background:none;border:0}.brand-logo img{max-height:38px;max-width:230px}.masthead-sub{font-size:13px;color:var(--sub);flex:1}.registration{border-radius:9px;text-decoration:none;background:var(--navy);color:#fff;font-weight:700;font-size:14px;padding:9px 19px;white-space:nowrap}.registration:hover{background:#175575;color:#fff}.desktop-nav{background:var(--navy)}.channel-items{display:flex;align-items:stretch;justify-content:space-between;gap:4px}.channel-items>a{display:flex;align-items:center;justify-content:center;position:relative;color:#eaf3f9;text-decoration:none;font-size:15px;font-weight:600;min-height:50px;padding:0 11px;white-space:nowrap}.channel-items>a:hover{color:#fff;background:#1c4965}.channel-items>a.active{color:#fff;font-weight:800}.channel-items>a.active:after{content:"";position:absolute;bottom:0;left:13px;right:13px;height:3px;background:var(--brand)}.menu-button{display:none}.nojs-nav{display:flex;flex-wrap:wrap;gap:10px;padding-block:12px}.nojs-nav a{font-size:13px}.breadcrumb{display:flex;gap:11px;font-size:13px;margin:26px 0 24px;color:var(--sub)}.breadcrumb a{color:var(--sub)}.page-intro{padding:35px 38px;background:#fff;border-left:5px solid var(--brand);margin-top:24px}.page-intro p:last-child{margin-bottom:0}.topic-nav{display:flex;flex-wrap:wrap;gap:9px;margin-top:27px}.topic-nav a{padding:8px 15px;background:var(--muted);text-decoration:none;border-radius:20px;font-weight:600;font-size:14px}.media-frame{display:flex;align-items:center;justify-content:center;width:100%;min-width:0;padding:8px;background:var(--muted);border-radius:14px;overflow:hidden}.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--wide{--media-limit:210px}.media-frame--logo{--media-limit:38px}.media-missing{min-height:100px;border:1px dashed #bacdd9;color:#607b8e;font-size:13px;text-align:center}.media-frame--hero.media-missing{min-height:210px}.media-frame--logo.media-missing{min-height:0}.hero-grid{display:grid;grid-template-columns:1.08fr 1fr;gap:42px;align-items:center;padding-top:54px}.hero-grid h1{font-size:42px}.hero-grid .lead{font-size:17px}.btn-row{display:flex;gap:11px;flex-wrap:wrap;margin-top:25px}.btn{display:inline-block;padding:11px 20px;border-radius:8px;background:var(--navy);color:white;text-decoration:none;font-weight:700;font-size:14px}.btn.alt{background:var(--brand);color:#082c38}.btn:hover{color:white;background:#235a78}.topic-index{display:grid;grid-template-columns:1fr 1fr;gap:0 44px;border-top:1px solid var(--rule)}.topic-index article{padding:22px 0;border-bottom:1px solid var(--rule)}.topic-index h3{margin-bottom:8px}.topic-index p{font-size:15px;margin-bottom:6px}.editor-grid{display:grid;grid-template-columns:2fr 1fr;gap:26px}.feature-article{background:white;padding:29px 30px;border-top:4px solid var(--brand)}.side-stack{display:grid;gap:19px}.side-stack article{background:var(--muted);padding:24px}.split-feature{display:grid;grid-template-columns:1fr 1.15fr;gap:38px;align-items:center}.split-feature.reverse{grid-template-columns:1.15fr 1fr}.contrast-band{background:var(--navy);color:#e8f4f9;padding:36px 42px}.contrast-band h2,.contrast-band h3,.contrast-band strong{color:white}.contrast-band a{color:#67e4ea}.lesson-stack{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;align-items:start}.lesson-stack article{border-top:3px solid var(--brand);padding:21px;background:white}.lesson-stack article:nth-child(2){margin-top:24px}.lesson-stack article:nth-child(3){margin-top:48px}.route-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;counter-reset:step}.route-steps article{padding:18px;border-left:2px solid var(--brand);background:#fff}.route-steps article:before{counter-increment:step;content:"0"counter(step);display:block;font-size:15px;color:#067783;font-weight:bold}.route-steps h3{font-size:18px}.declaration{border-top:1px solid var(--rule);padding-top:25px}.main-aside{display:grid;grid-template-columns:minmax(0,2.15fr) minmax(210px,.85fr);gap:42px}.reading-column{max-width:795px}.reading-column section{margin:0 0 42px}.reading-column p{line-height:1.84}.fact-box{background:var(--muted);padding:22px 23px;margin-bottom:22px;border-radius:11px}.fact-box h3{font-size:18px}.fact-box ul{padding-left:19px}.article-photo{margin:26px 0}.article-photo .media-frame{max-width:860px}.table-scroll{width:100%;overflow-x:auto;border:1px solid var(--rule);border-radius:9px;background:#fff;margin:20px 0 32px}.data-table{width:100%;border-collapse:collapse;min-width:600px;text-align:left;font-size:15px}.data-table caption{text-align:left;padding:15px 18px;font-weight:700;color:var(--ink)}.data-table th,.data-table td{border-bottom:1px solid var(--rule);padding:14px 17px;vertical-align:top}.data-table th{background:var(--muted);color:var(--ink)}.data-table tr:last-child td{border-bottom:0}.process-list{counter-reset:proc;list-style:none;padding:0}.process-list li{position:relative;padding:0 0 23px 56px;border-left:1px solid var(--rule);margin-left:18px}.process-list li:before{counter-increment:proc;content:counter(proc);display:grid;place-items:center;position:absolute;left:-19px;top:0;border-radius:50%;width:37px;height:37px;background:var(--navy);color:white;font-weight:700}.process-list strong{display:block}.notes-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.note{background:white;border:1px solid var(--rule);border-radius:10px;padding:23px}.wide-rule{border-top:1px solid var(--rule);padding-top:25px}.horizontal-intro{display:grid;grid-template-columns:1.35fr 1fr;gap:28px;align-items:center;margin:28px 0 48px}.esports-matrix{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.esports-matrix article{background:white;border-bottom:4px solid var(--brand);padding:24px}.alternating-story{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;margin:44px 0;align-items:start}.alternating-story:nth-child(even){grid-template-columns:.85fr 1.15fr}.exhibit-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start}.exhibit-grid article{background:white;padding:20px}.exhibit-grid article:nth-child(2){margin-top:55px}.exhibit-grid article:nth-child(3){grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center}.rules-shell{display:grid;grid-template-columns:235px minmax(0,1fr);gap:43px}.sticky-index{position:sticky;top:16px;align-self:start;background:var(--muted);padding:24px}.sticky-index a{display:block;margin:11px 0}.rule-chapter{background:#fff;border:1px solid var(--rule);padding:28px 32px;margin-bottom:28px}.rule-chapter h2{border-bottom:1px solid var(--rule);padding-bottom:12px}.faq{margin:20px 0}.faq details{padding:15px 19px;border:1px solid var(--rule);background:#fff;margin-bottom:10px;border-radius:8px}.faq summary{font-weight:700;color:var(--ink);cursor:pointer}.faq details p{margin:12px 0 0}.service-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:40px}.service-menu{background:var(--muted);padding:21px;align-self:start}.service-menu a{display:block;padding:7px 2px}.service-content>section{margin-bottom:42px}.related{border-top:1px solid var(--rule);padding-top:24px}.related-links{display:flex;gap:12px;flex-wrap:wrap}.related-links a{padding:11px 17px;border:1px solid #bed5e0;border-radius:8px;background:#fff;text-decoration:none}.quick-links{display:none}.site-footer{background:var(--footer);color:#dcecf5;margin-top:55px;padding:43px 0}.site-footer p{font-size:14px;max-width:660px;line-height:1.8}.footer-layout{display:grid;grid-template-columns:1.5fr 1fr;gap:48px}.footer-brand{font-weight:700;color:#fff;text-decoration:none}.site-footer nav{display:grid;grid-template-columns:1fr 1fr;gap:9px 22px;align-content:start}.site-footer nav a{color:#dcecf5;font-size:14px}.drawer-backdrop,.mobile-drawer{display:none}#back-to-top{position:fixed;right:22px;bottom:23px;width:44px;height:44px;border:0;border-radius:50%;background:var(--navy);color:white;box-shadow:0 3px 13px #102e4633}#back-to-top[hidden]{display:none}@media(max-width:1024px){.content-width{padding-inline:22px}.section-space{margin-block:48px}.hero-grid{gap:26px}.hero-grid h1{font-size:37px}.channel-items>a{font-size:14px;padding-inline:7px}}@media(max-width:920px){.masthead{height:63px;gap:12px;justify-content:space-between}.menu-button{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;width:40px;height:40px;padding:0;flex:none;background:white;border:1px solid var(--rule);border-radius:8px}.menu-button span{height:2px;width:19px;background:var(--ink)}.brand{margin-inline:auto}.brand-logo img{max-height:30px;max-width:190px}.brand-logo strong{font-size:17px}.masthead-sub,.desktop-nav{display:none}.registration{font-size:12px;padding:9px 10px}.drawer-backdrop{display:block;position:fixed;inset:0;background:#071c2bb3;opacity:0;visibility:hidden;pointer-events:none;z-index:100;transition:opacity .2s,visibility .2s}.drawer-backdrop.open{opacity:1;visibility:visible;pointer-events:auto}.mobile-drawer{display:block;position:fixed;left:0;top:0;bottom:0;width:min(86vw,340px);overflow-y:auto;background:#fff;z-index:101;transform:translateX(-103%);visibility:hidden;transition:transform .22s,visibility .22s;padding:20px 23px;box-shadow:6px 0 20px #0002}.mobile-drawer.open{transform:translateX(0);visibility:visible}.drawer-top{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--rule);padding-bottom:14px}.drawer-close{border:0;background:var(--muted);border-radius:8px;width:40px;height:40px;font-size:28px;line-height:1}.drawer-group{margin:24px 0 6px;color:var(--sub);font-weight:700;font-size:12px;letter-spacing:.12em}.mobile-drawer>a{display:block;padding:11px 7px;color:var(--ink);text-decoration:none;border-bottom:1px solid #ecf1f4}.drawer-open{overflow:hidden}.quick-links{display:flex;flex-wrap:wrap;gap:12px;border-top:1px solid var(--rule);padding-top:25px;margin-top:30px}.quick-links a{font-size:14px}}@media(max-width:760px){.main-aside,.horizontal-intro,.split-feature,.split-feature.reverse,.alternating-story,.alternating-story:nth-child(even),.service-layout,.rules-shell{grid-template-columns:1fr}.reading-column{max-width:100%}.sticky-index{position:static}.hero-grid{grid-template-columns:1fr}.editor-grid{grid-template-columns:1fr}.side-stack{grid-template-columns:1fr 1fr}.lesson-stack{grid-template-columns:1fr 1fr}.lesson-stack article:nth-child(2),.lesson-stack article:nth-child(3),.exhibit-grid article:nth-child(2){margin-top:0}.route-steps{grid-template-columns:1fr 1fr}.esports-matrix{grid-template-columns:1fr 1fr}.service-content{order:0}.service-menu{order:1}.exhibit-grid article:nth-child(3){display:block}.footer-layout{grid-template-columns:1fr}.fact-box{margin-top:10px}}@media(max-width:640px){body{font-size:15px}.content-width{padding-inline:16px}h1{font-size:27px}h2{font-size:22px}h3{font-size:18px}.section-space{margin-block:36px}.lead{font-size:15px}.hero-grid{padding-top:30px;gap:20px}.hero-grid h1{font-size:30px}.page-intro{padding:24px 21px}.feature-article,.side-stack article,.rule-chapter{padding:20px}.topic-index{grid-template-columns:1fr}.side-stack,.lesson-stack,.route-steps,.esports-matrix,.notes-grid,.exhibit-grid{grid-template-columns:1fr}.exhibit-grid article:nth-child(3){grid-column:auto}.lesson-stack article:nth-child(3){margin-top:0}.contrast-band{padding:26px 22px}.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}.breadcrumb{margin:20px 0}.site-footer{padding:35px 0}.footer-layout{gap:17px}.registration{padding-inline:9px}.brand-logo strong{font-size:15px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
