:root{--bg:#F4F7FA;--paper:#fff;--soft:#EAF1F6;--mint:#E9F8F8;--navy:#102E46;--navy2:#163C57;--teal:#13B8C5;--blue:#237BD3;--title:#18364B;--text:#344C60;--muted:#64798A;--line:#DCE6ED;--footer:#0B2539}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif;overflow-wrap:anywhere}a{color:var(--navy2);text-decoration:none}a:hover{color:#087d90}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--teal);outline-offset:4px}button{font:inherit;cursor:pointer}img{max-width:100%}figure{margin:0}h1,h2,h3{color:var(--title);line-height:1.38;margin:0 0 .7em}h1{font-size:clamp(2rem,3.05vw,2.3rem);letter-spacing:-.025em}h2{font-size:clamp(1.45rem,2.2vw,1.75rem)}h3{font-size:1.22rem}p{margin:0 0 1.1em}ul,ol{padding-left:1.4em}li+li{margin-top:.4em}strong{color:var(--title)}.wrap{width:min(100% - 56px,1200px);margin-inline:auto}.read-width{max-width:790px}.section{margin-block:60px}.section-tight{margin-block:40px}.eyebrow{font-size:.81rem;letter-spacing:.13em;font-weight:800;color:#007d8c;text-transform:uppercase;margin-bottom:11px}.lead{font-size:1.1rem;line-height:1.85;color:#4c6375}.muted{color:var(--muted)}.text-link{display:inline-flex;align-items:center;gap:.25em;font-weight:750;color:#17649c;text-decoration:underline;text-underline-offset:5px;text-decoration-color:#a6cedf}.skip-link{position:absolute;top:-100px;left:12px;z-index:100;background:#fff;padding:8px 16px}.skip-link:focus{top:8px}
.site-header{background:var(--navy);color:white}.brand-row{height:72px;display:flex;align-items:center;gap:22px}.brand{display:flex;align-items:center;max-width:230px;min-width:0}.brand-logo{display:block;width:auto;height:auto;max-height:38px;max-width:100%;object-fit:contain}.brand-note{font-size:.79rem;margin:0;color:#c7dce7;white-space:nowrap}.brand-note i{font-style:normal;color:#6f9bb4;margin:0 5px}.logo-fallback{color:white;font-size:1.45rem;line-height:1;font-weight:900;white-space:nowrap;letter-spacing:.07em}.logo-fallback span{color:#6ae1e7}.register-link{margin-left:auto;display:inline-flex;align-items:center;justify-content:center;min-height:41px;padding:0 23px;border-radius:10px;background:var(--teal);color:#072b3b;font-weight:850;font-size:.91rem;white-space:nowrap}.register-link:hover{background:#47d5dc;color:#062839}.desktop-nav{background:#0d293e;border-top:1px solid #244459}.nav-inner{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));align-items:stretch}.desktop-nav a{position:relative;min-height:50px;display:flex;align-items:center;justify-content:center;font-size:.91rem;font-weight:650;color:#dfecf2;white-space:nowrap}.desktop-nav a:hover,.desktop-nav a[aria-current]{color:#fff;background:#21465f}.desktop-nav a[aria-current]{font-weight:850}.desktop-nav a[aria-current]::after{content:"";position:absolute;bottom:0;left:28%;right:28%;height:3px;background:var(--teal);border-radius:4px}.menu-toggle,.no-script-nav,.mobile-quick{display:none}.drawer-overlay,.mobile-drawer{visibility:hidden;pointer-events:none}.breadcrumb{display:flex;gap:10px;align-items:center;color:var(--muted);font-size:.85rem;padding-block:22px 8px}.breadcrumb a{color:#26658c}.page-intro{padding:25px 0 26px;border-bottom:1px solid var(--line)}.page-intro p:last-child{margin-bottom:0}.page-intro .lead{max-width:830px}.page-kicker{font-weight:800;color:#087e89;letter-spacing:.12em;font-size:.8rem}.page-section{padding-top:46px}.page-section+.page-section{border-top:1px solid var(--line);margin-top:48px}.surface{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:26px}.soft-surface{background:var(--soft);border-radius:14px;padding:28px}.dark-surface{background:var(--navy2);color:#e7f4f9;border-radius:14px;padding:30px}.dark-surface h2,.dark-surface h3,.dark-surface strong{color:white}.dark-surface a{color:#94eef1}.split{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:center}.split>*{min-width:0}.split--wide{grid-template-columns:1.2fr .8fr}.split--text{grid-template-columns:1.5fr .7fr}.intro-grid{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:42px;align-items:start}.intro-grid>*{min-width:0}.media-frame{display:flex;align-items:center;justify-content:center;min-width:0;width:100%;padding:8px;border-radius:14px;background:var(--soft);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--article{--media-limit:220px}.media-frame--banner{--media-limit:210px}.media-frame--mobile{--media-limit:350px;max-width:320px;margin-inline:auto}.media-frame--missing{min-height:110px;border:1px dashed #bbccd8;color:#77909e;text-align:center;font-size:.86rem}.media-frame--missing.media-frame--hero{min-height:190px}.media-frame--missing.media-frame--mobile{min-height:200px}.pill-nav{display:flex;flex-wrap:wrap;gap:10px;padding:22px 0}.pill-nav a{padding:7px 16px;background:white;border:1px solid var(--line);border-radius:999px;font-size:.88rem;font-weight:750}.pill-nav a:hover{border-color:var(--teal)}.chapter-heading{border-left:4px solid var(--teal);padding-left:16px}.number-steps{list-style:none;counter-reset:steps;padding:0;display:grid;gap:15px}.number-steps li{counter-increment:steps;position:relative;padding:19px 20px 18px 64px;background:#fff;border:1px solid var(--line);border-radius:12px}.number-steps li::before{content:counter(steps,decimal-leading-zero);position:absolute;left:18px;top:18px;font-weight:900;color:#007f8b}.number-steps li strong{display:block}.mini-index{border-top:3px solid var(--teal);padding:17px;background:#fff;border-radius:0 0 12px 12px}.mini-index a{display:block;padding:7px 0;border-bottom:1px solid var(--line);font-weight:700}.mini-index a:last-child{border:0}.mini-index h2{font-size:1.13rem}.table-scroll{max-width:100%;overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:white}.data-table{width:100%;border-collapse:collapse;min-width:550px;font-size:.95rem}.data-table caption{text-align:left;padding:18px 18px 4px;font-weight:800;color:var(--title)}.data-table th,.data-table td{text-align:left;vertical-align:top;padding:13px 17px;border-bottom:1px solid var(--line)}.data-table th{background:#e7f0f6;color:#173951;font-weight:800}.data-table tr:last-child td{border-bottom:0}.note{border-left:3px solid var(--teal);background:var(--mint);padding:16px 20px;margin:25px 0}.two-cols{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.three-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.two-cols>*,.three-cols>*{min-width:0}.related{display:flex;flex-wrap:wrap;gap:12px;margin:23px 0}.related a{display:inline-flex;padding:10px 16px;background:#e7f2f6;border-radius:9px;font-weight:700}.faq-list{display:grid;gap:12px}.faq-item{background:white;border:1px solid var(--line);border-radius:10px;padding:0 18px}.faq-item summary{cursor:pointer;font-weight:800;color:var(--title);padding:15px 0}.faq-item p{padding-bottom:15px;margin:0}.faq-item[open]{border-color:#a1d7dd}.caption-text{font-size:.86rem;color:var(--muted);margin:8px 2px 0}
/* Editorial index */.home-hero{display:grid;grid-template-columns:1.04fr .96fr;gap:42px;align-items:center;padding:48px 0 38px}.home-hero>*{min-width:0}.home-hero h1{font-size:clamp(2rem,3.6vw,2.75rem);max-width:650px}.home-hero .lead{font-size:1.05rem}.button-row{display:flex;gap:13px;flex-wrap:wrap;margin-top:26px}.button-link{padding:10px 19px;border-radius:9px;font-weight:800;background:var(--navy);color:white}.button-link:hover{color:white;background:#215473}.button-link--outline{background:transparent;border:1px solid #a8c8d5;color:var(--navy)}.button-link--outline:hover{background:white;color:var(--navy)}.directory-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:38px}.directory-item{display:grid;grid-template-columns:42px 1fr;gap:16px;border-top:1px solid #cbdbe6;padding:21px 0}.directory-item .n{font-size:1.35rem;color:#0c939e;font-weight:900}.directory-item h3{margin-bottom:.35em}.directory-item p{margin-bottom:.35em;font-size:.94rem}.focus-grid{display:grid;grid-template-columns:2fr 1fr;gap:22px}.focus-grid>*{min-width:0}.focus-side{display:grid;gap:16px}.focus-main{padding:34px;background:#e9f4f7;border-left:4px solid var(--teal);border-radius:0 14px 14px 0}.focus-main h3{font-size:1.55rem}.focus-side article{border-bottom:1px solid var(--line);padding:4px 0 16px}.focus-side h3{font-size:1.12rem}.editorial-band{padding:35px 0;border-block:1px solid var(--line)}.rule-stack{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;align-items:start}.rule-stack article{background:white;border-top:4px solid var(--teal);padding:23px;border-radius:0 0 12px 12px}.rule-stack article:nth-child(2){margin-top:22px}.rule-stack article:nth-child(3){margin-top:44px}.reading-route{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0;counter-reset:route}.reading-route article{padding:15px 22px;border-left:1px solid #b7cbd7}.reading-route article::before{counter-increment:route;content:'0' counter(route);font-weight:900;color:#1597a5;display:block;margin-bottom:12px}.reading-route h3{font-size:1.1rem}
/* Distinct page layouts */.sports-columns{display:grid;grid-template-columns:minmax(0,1fr) 255px;gap:44px}.sports-columns>*{min-width:0}.article-prose{max-width:790px}.article-prose p{margin-bottom:1.35em}.football-feature{margin:25px 0 37px;max-width:980px}.tactic-bars{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.tactic-bars div{padding:17px;background:#e8f2f6;border-top:3px solid #16a5b1}.esports-matrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.esports-matrix article{background:#fff;border:1px solid var(--line);border-top:5px solid var(--teal);padding:24px;border-radius:10px}.esports-matrix h3{font-size:1.25rem}.exhibit{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:center;margin-block:32px}.exhibit:nth-of-type(even) .exhibit-visual{order:2}.exhibit>*{min-width:0}.exhibit-visual{max-width:610px}.exhibit:nth-of-type(3){grid-template-columns:.86fr 1.14fr}.rules-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:38px;align-items:start}.rules-layout>*{min-width:0}.rules-sidebar{position:sticky;top:22px}.rules-sidebar a{display:block;padding:10px 12px;border-bottom:1px solid #cddfe7}.rules-sidebar h2{font-size:1.1rem}.rules-content section{padding-bottom:38px;margin-bottom:35px;border-bottom:1px solid var(--line)}.rules-content section:last-child{border:0}.about-layout{display:grid;grid-template-columns:235px minmax(0,1fr);gap:40px}.about-layout>*{min-width:0}.about-sidebar{align-self:start;background:#e7f0f6;border-radius:12px;padding:22px}.about-sidebar a{display:block;padding:9px 0;border-bottom:1px solid #ccdde7;font-weight:700}.about-article section{padding-bottom:26px;margin-bottom:34px;border-bottom:1px solid var(--line)}.about-article section:last-child{border:0}.footer-brand .logo-fallback{font-size:1.5rem}.site-footer{background:var(--footer);color:#c6dfeb;padding-top:44px;margin-top:72px}.footer-grid{display:grid;grid-template-columns:2.1fr 1fr 1fr;gap:55px}.footer-grid h2{color:white;font-size:1.1rem}.footer-grid a:not(.footer-brand){display:block;color:#dcecf5;margin-bottom:7px}.footer-grid a:hover{color:#5be4e5}.footer-grid p{max-width:460px;font-size:.89rem}.brand-logo--footer{max-height:34px}.footer-bottom{padding:18px 0;margin-top:30px;border-top:1px solid #315063;display:flex;justify-content:space-between;gap:16px;font-size:.8rem}.back-to-top{position:fixed;bottom:22px;right:20px;z-index:10;border:0;border-radius:100%;width:43px;height:43px;color:white;background:#126e8b;box-shadow:0 4px 17px #102e4626}.back-to-top[hidden]{display:none}
@media(max-width:1050px){.wrap{width:min(100% - 44px,1200px)}.home-hero{gap:24px}.section{margin-block:46px}.footer-grid{gap:24px}.brand-note{font-size:.71rem}.desktop-nav a{font-size:.83rem}}
@media(max-width:920px){.brand-row{height:62px;display:grid;grid-template-columns:44px minmax(0,1fr) auto;gap:10px}.brand{justify-self:center;max-width:calc(100vw - 212px)}.brand-logo{max-height:30px}.logo-fallback{font-size:1.19rem}.brand-note,.desktop-nav{display:none}.register-link{margin:0;font-size:.78rem;padding:0 13px;min-height:39px}.menu-toggle{display:flex;width:40px;height:40px;padding:10px 9px;background:transparent;border:1px solid #537284;border-radius:9px;flex-direction:column;justify-content:space-between}.menu-toggle span{display:block;background:white;height:2px;width:100%;border-radius:2px}.drawer-overlay{display:block;position:fixed;inset:0;background:rgba(4,21,34,.53);opacity:0;transition:opacity .22s;z-index:40}.mobile-drawer{display:block;position:fixed;left:0;top:0;bottom:0;width:min(86vw,340px);background:#fff;z-index:41;overflow-y:auto;transform:translateX(-105%);transition:transform .22s;box-shadow:4px 0 25px #071a2520;padding:17px 22px 30px}.menu-open{overflow:hidden}.menu-open .drawer-overlay{visibility:visible;pointer-events:auto;opacity:1}.menu-open .mobile-drawer{visibility:visible;pointer-events:auto;transform:translateX(0)}.drawer-heading{display:flex;align-items:center;justify-content:space-between;font-size:1.15rem;color:var(--title);font-weight:900;border-bottom:1px solid var(--line);padding-bottom:12px}.drawer-close{width:40px;height:40px;background:var(--soft);border:0;border-radius:8px;font-size:1.7rem;line-height:1}.drawer-label{font-size:.78rem;font-weight:900;color:#647f8d;margin:24px 0 8px;letter-spacing:.1em}.mobile-drawer nav a{display:block;padding:10px 6px;color:var(--title);border-bottom:1px solid var(--line);font-weight:700}.mobile-drawer nav a[aria-current]{color:#087b86;border-left:3px solid var(--teal);padding-left:12px;background:var(--mint)}.drawer-note{margin-top:30px;color:var(--muted);font-size:.81rem}.mobile-quick{display:flex;justify-content:center;gap:clamp(8px,2vw,22px);padding:20px 0;flex-wrap:wrap}.mobile-quick a{font-size:.85rem;font-weight:750}.home-hero{padding:32px 0}.intro-grid{grid-template-columns:1fr}.sports-columns{grid-template-columns:1fr}.sports-columns .mini-index{max-width:none}.about-layout{grid-template-columns:1fr}.about-sidebar{order:2}.about-article{order:1}}
@media(max-width:760px){.split,.split--wide,.split--text,.home-hero,.exhibit,.exhibit:nth-of-type(3),.focus-grid{grid-template-columns:1fr}.home-hero .media-frame{grid-row:2}.two-cols,.three-cols,.esports-matrix{grid-template-columns:1fr}.exhibit:nth-of-type(even) .exhibit-visual{order:0}.rules-layout{grid-template-columns:1fr}.rules-sidebar{position:static}.rules-sidebar a{display:inline-flex;margin:4px;border:1px solid #cddfe7;border-radius:8px;padding:5px 12px}.rule-stack{grid-template-columns:1fr}.rule-stack article:nth-child(n){margin-top:0}.reading-route{grid-template-columns:repeat(2,minmax(0,1fr));row-gap:15px}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div:first-child{grid-column:1/-1}.footer-bottom{flex-direction:column}.tactic-bars{grid-template-columns:1fr}}
@media(max-width:640px){body{font-size:15px;line-height:1.78}.wrap{width:calc(100% - 32px)}h1{font-size:clamp(1.55rem,6.6vw,1.83rem)}.home-hero h1{font-size:clamp(1.69rem,7.2vw,2rem)}h2{font-size:1.35rem}h3{font-size:1.11rem}.lead{font-size:1rem}.section{margin-block:34px}.page-section{padding-top:32px}.page-section+.page-section{margin-top:32px}.home-hero{gap:20px}.surface,.soft-surface,.dark-surface{padding:19px}.directory-list{grid-template-columns:1fr}.directory-item{padding:16px 0}.focus-main{padding:20px}.button-row{gap:9px}.button-link{font-size:.9rem}.media-frame--hero{--media-limit:205px}.media-frame--feature{--media-limit:185px}.media-frame--card{--media-limit:145px}.media-frame--article{--media-limit:175px}.media-frame--banner{--media-limit:135px}.media-frame--mobile{--media-limit:285px;max-width:250px}.footer-grid{gap:26px}.data-table{font-size:.88rem}.data-table th,.data-table td{padding:10px 12px}.reading-route{grid-template-columns:1fr 1fr}.reading-route article{padding:9px 12px}.brand{max-width:calc(100vw - 190px)}.register-link{padding:0 10px}.mobile-quick a{font-size:.78rem}}
@media(max-width:380px){.brand-row{grid-template-columns:40px minmax(0,1fr) auto;gap:5px}.brand{max-width:calc(100vw - 174px)}.register-link{font-size:.73rem;padding:0 8px}.home-hero h1{font-size:1.67rem}.footer-grid{grid-template-columns:1fr}.footer-grid>div:first-child{grid-column:auto}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
@media(hover:hover){.surface:hover{border-color:#b6d5df}}