:root{--bg:#F4F7FA;--paper:#fff;--mist:#EAF1F6;--aqua:#E9F8F8;--navy:#102E46;--deep:#163C57;--teal:#13B8C5;--blue:#237BD3;--heading:#18364B;--ink:#344C60;--muted:#64798A;--line:#DCE6ED;--radius:13px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:25px}body{margin:0;background:var(--bg);color:var(--ink);font-family:Arial,'PingFang SC','Microsoft YaHei',sans-serif;font-size:16px;line-height:1.8;overflow-x:clip}a{color:#1767A5;text-underline-offset:3px}a:hover{color:#0C526F}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--teal);outline-offset:3px}button{font:inherit;cursor:pointer}img{max-width:100%}.wrap{width:min(100% - 56px,1200px);margin-inline:auto}.reading-width{max-width:780px}.skip-link{position:absolute;top:-120px;left:16px;z-index:100;background:#fff;padding:9px 15px}.skip-link:focus{top:12px}h1,h2,h3{color:var(--heading);line-height:1.4;margin:0 0 18px}h1{font-size:36px;line-height:1.31;letter-spacing:-.035em}h2{font-size:27px;letter-spacing:-.025em}h3{font-size:20px}p{margin:0 0 16px}section[id],div[id]{scroll-margin-top:24px}.lead{font-size:18px;line-height:1.8;color:#3A566B}.eyebrow{font-size:12px;letter-spacing:.15em;font-weight:800;color:#087E91;text-transform:uppercase;margin-bottom:16px}.section{padding-block:58px}.section-heading{max-width:790px;margin-bottom:29px}.section-heading p:last-child{color:var(--muted)}.site-header{background:var(--paper)}.brand-bar{height:72px;display:flex;align-items:center;gap:18px}.brand{text-decoration:none;display:flex;align-items:center;min-width:0;gap:10px;color:var(--navy)}.brand .media-frame{background:transparent;border:0;padding:0;width:auto;margin:0;flex:0 0 auto}.brand .media-frame img{max-height:38px;max-width:145px;width:auto;height:auto}.brand .media-missing{min-width:88px;min-height:32px}.brand .media-missing span{font-size:11px}.brand-wordmark{font-size:11px;letter-spacing:.13em;font-weight:800;white-space:nowrap}.brand-subtitle{font-size:12px;color:var(--muted);padding-left:16px;border-left:1px solid var(--line);white-space:nowrap}.entry-link{margin-left:auto;text-decoration:none;background:var(--teal);color:#073444;padding:8px 20px;border-radius:8px;font-size:14px;font-weight:800;white-space:nowrap}.entry-link:hover{background:#10A6B2;color:#06303B}.desktop-nav{background:var(--navy)}.nav-list{display:flex;align-items:stretch;min-height:50px}.nav-list a{flex:1;text-align:center;display:flex;align-items:center;justify-content:center;text-decoration:none;position:relative;font-size:15px;color:#E4EFF6;font-weight:600;white-space:nowrap;padding:8px 3px}.nav-list a:hover{background:rgba(255,255,255,.09);color:#fff}.nav-list a[aria-current=page]{color:#fff;font-weight:800}.nav-list a[aria-current=page]::after{content:'';position:absolute;height:3px;bottom:0;width:36%;background:var(--teal)}.menu-toggle,.mobile-drawer,.drawer-overlay,.nojs-nav{display:none}.media-frame{margin:0;display:flex;align-items:center;justify-content:center;width:100%;min-width:0;padding:9px;background:var(--mist);border-radius:var(--radius);border:1px solid var(--line)}.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--rules{--media-limit:220px}.media-frame--mobile{--media-limit:350px;max-width:320px;margin:auto}.media-frame--wide{--media-limit:210px}.media-missing{min-height:105px;color:#688495;text-align:center;padding:18px}.media-missing span{font-size:13px}.home-hero{padding-block:55px 65px;display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr);align-items:center;gap:55px}.home-hero h1{font-size:42px;max-width:620px}.hero-copy p{max-width:650px}.button-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}.button{display:inline-block;border-radius:9px;background:var(--navy);color:white;text-decoration:none;padding:11px 20px;font-size:15px;font-weight:700}.button:hover{color:white;background:var(--deep)}.button-outline{background:transparent;border:1px solid var(--navy);color:var(--navy)}.button-outline:hover{background:var(--mist);color:var(--navy)}.topic-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 40px}.topic-grid a{text-decoration:none;border-top:1px solid var(--line);padding:18px 8px 20px 0;display:block;min-width:0}.topic-grid a:hover strong{color:var(--blue)}.topic-grid span{font-size:12px;letter-spacing:.09em;font-weight:800;color:#19869A}.topic-grid strong{display:block;color:var(--heading);font-size:19px;margin:7px 0}.topic-grid p{font-size:15px;color:var(--ink);margin:0}.band{background:var(--mist)}.pale-band{background:var(--aqua)}.focus-layout{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:20px}.focus-main{padding:34px;background:white;border-left:5px solid var(--teal)}.focus-main h3{font-size:24px}.focus-side{display:grid;gap:15px}.focus-side article{background:rgba(255,255,255,.75);padding:23px;border:1px solid #D1E2E8}.focus-side h3{font-size:18px}.focus-side p{font-size:15px}.focus-side a,.rule-steps a{font-weight:700}.meta{font-size:12px;color:#47758A;font-weight:800}.text-link{font-weight:800;text-decoration:none;border-bottom:2px solid var(--teal);padding-bottom:3px}.split{display:grid;grid-template-columns:1fr 1fr;gap:45px;align-items:center}.visual-band{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}.three-notes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px;margin:22px 0}.three-notes article{border-left:2px solid #98D7DE;padding-left:14px}.three-notes h3{font-size:17px}.three-notes p{font-size:14px}.rule-steps{display:grid;gap:13px}.rule-steps article{display:grid;grid-template-columns:50px 1fr;gap:24px;background:white;border:1px solid var(--line);border-radius:10px;padding:24px 28px;margin-left:0}.rule-steps article:nth-child(2){margin-left:34px}.rule-steps article:nth-child(3){margin-left:68px}.rule-steps article>span{font-size:27px;color:#1298A9;font-weight:800}.rule-steps p{max-width:750px}.dark-panel{background:var(--deep)}.dark-panel h2,.dark-panel a{color:white}.dark-panel .eyebrow{color:#80E8ED}.reading-route{list-style:none;padding:0;margin:30px 0 0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.reading-route li{border-top:2px solid #43BCCC;padding-top:14px}.reading-route span{display:block;color:#A9D4E0;font-size:13px;margin-bottom:8px}.reading-route a{font-weight:700;text-decoration:none}.editorial{max-width:1200px}.editorial p{max-width:890px}.page-intro{padding-block:30px 37px;border-bottom:1px solid var(--line)}.page-intro h1{max-width:980px}.page-intro .lead{max-width:920px}.breadcrumbs{display:flex;gap:10px;color:var(--muted);font-size:13px;margin-bottom:20px}.breadcrumbs a{color:var(--muted)}.article-section{padding-block:32px;border-bottom:1px solid var(--line)}.article-section:first-child{padding-top:0}.article-section h2{margin-bottom:18px}.article-section h3{margin-top:20px;margin-bottom:10px}.article-section p{max-width:800px}.article-wide{max-width:1000px}.article-wide>.article-section p{max-width:800px}.page-with-aside{display:grid;grid-template-columns:minmax(0,760px) minmax(0,280px);gap:65px;padding-block:25px}.article-column{min-width:0}.fact-aside{align-self:start;background:#fff;border-top:4px solid var(--teal);padding:24px;position:sticky;top:20px}.fact-aside h2{font-size:19px}.fact-aside ol{padding-left:21px}.fact-aside li{margin-bottom:10px}.fact-aside p{font-size:14px}.local-nav{display:flex;gap:8px;flex-wrap:wrap;padding-block:12px 25px}.local-nav a{text-decoration:none;border:1px solid #C8DAE3;border-radius:50px;background:white;padding:6px 15px;font-weight:700;font-size:14px}.local-nav a:hover{border-color:var(--teal)}.phase-flow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin:25px 0}.phase-flow div{min-width:0;padding:18px 12px;background:#E6F3F5;border-top:3px solid #1CAEB7}.phase-flow strong,.phase-flow span{display:block}.phase-flow strong{font-size:15px;color:var(--heading)}.phase-flow span{font-size:13px;color:var(--muted);margin-top:9px}.table-scroll{overflow-x:auto;max-width:100%;margin:22px 0 10px;border:1px solid var(--line);border-radius:10px;background:white}table{width:100%;border-collapse:collapse;min-width:620px;font-size:15px;text-align:left}caption{text-align:left;padding:14px 18px;font-weight:700;color:var(--heading);caption-side:top}th,td{padding:13px 17px;border-bottom:1px solid var(--line);vertical-align:top}thead{background:#E5F1F5;color:#153D52}th[scope=row]{color:var(--heading);min-width:125px}tbody tr:last-child td,tbody tr:last-child th{border-bottom:0}.editorial-columns{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:30px}.editorial-columns article{min-width:0}.number-list{padding-left:23px}.number-list li{margin:10px 0}.related-links{display:flex;flex-wrap:wrap;gap:10px 14px;margin-top:26px}.related-links a{display:inline-block;padding:9px 14px;border:1px solid #BBD2DF;background:#fff;border-radius:8px;text-decoration:none;font-size:14px;font-weight:700}.football-layout{padding-block:20px 35px}.football-layout>.media-frame{max-width:900px;margin:0 auto 15px}.concept-pairs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin:24px 0}.concept-pairs article{background:white;padding:21px;border:1px solid var(--line);border-radius:9px}.concept-pairs h3{margin:0 0 10px}.note-box{display:block;background:#E7F5F7;border-left:4px solid var(--teal);padding:18px 21px;border-radius:0 8px 8px 0;margin:20px 0}.note-box p{margin:5px 0 0}.transition-list{padding:0;list-style:none;display:grid;gap:0}.transition-list li{display:grid;grid-template-columns:68px 1fr;gap:20px;border-top:1px solid var(--line);padding:22px 0}.transition-list li>span{font-size:29px;font-weight:800;color:#169EB0}.transition-list h3{margin:0 0 9px}.question-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.question-grid article{background:#fff;border:1px solid var(--line);padding:19px}.question-grid h3{font-size:18px;margin:0 0 7px}.question-grid p{margin:0}.esports-split{display:grid;grid-template-columns:.9fr 1.1fr;gap:40px;align-items:center}.esports-flow{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.esports-flow article{background:#fff;border:1px solid var(--line);border-top:4px solid var(--teal);padding:23px}.esports-flow span{color:#148F9E;font-size:12px;letter-spacing:.08em;font-weight:700}.esports-flow h3{margin:8px 0}.gallery-intro{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:40px}.gallery-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px 42px;align-items:center}.gallery-grid article{padding:10px 16px;border-left:3px solid var(--teal)}.rules-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:55px;padding-block:42px 60px}.rules-toc{align-self:start;position:sticky;top:18px;border-top:4px solid var(--teal);background:white;padding:20px}.rules-toc h2{font-size:18px}.rules-toc nav{display:grid}.rules-toc a{padding:11px 0;border-bottom:1px solid var(--line);text-decoration:none;font-weight:700;font-size:14px}.rules-toc p{font-size:13px;color:var(--muted);margin:17px 0 0}.rules-content{min-width:0;max-width:850px}.rules-content .article-section:first-child{padding-top:0}.rules-content .media-frame{max-width:700px;margin:20px 0}.faq-list{display:grid;gap:9px;margin-top:20px}.faq-list details{background:#fff;border:1px solid var(--line);border-radius:9px;padding:0 18px}.faq-list summary{cursor:pointer;list-style-position:outside;padding:13px 0;font-weight:700;color:var(--heading)}.faq-list details p{padding:0 0 17px;margin:0;font-size:15px}.about-layout{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:55px;padding-block:32px 60px}.about-main{min-width:0}.about-aside{align-self:start;position:sticky;top:18px;background:white;border-top:4px solid var(--teal);padding:22px;display:grid;gap:9px}.about-aside h2{font-size:19px}.about-aside a{text-decoration:none;border-bottom:1px solid var(--line);padding-bottom:7px}.about-aside p{font-size:13px;color:var(--muted);margin-top:12px}.mobile-guide{display:grid;grid-template-columns:1fr 230px;gap:25px;align-items:center}.site-footer{background:#0B2539;color:#DCECF5;padding:46px 0 20px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:38px}.footer-brand{text-decoration:none;color:white;font-size:23px;font-weight:800}.footer-brand small{font-size:11px;letter-spacing:.12em}.site-footer h2{font-size:17px;color:#fff;margin-bottom:13px}.site-footer a:not(.footer-brand){display:block;color:#DCECF5;text-decoration:none;font-size:14px;margin:6px 0}.site-footer a:hover{text-decoration:underline}.site-footer p{font-size:14px;max-width:480px}.footer-bottom{border-top:1px solid #2D495D;padding-top:15px;margin-top:28px;display:flex;justify-content:space-between;gap:20px;font-size:13px}.footer-bottom a{margin:0!important}.mobile-quick{display:none}.back-top{position:fixed;bottom:18px;right:20px;border:1px solid #CBD7DD;border-radius:50%;background:white;color:var(--navy);width:44px;height:44px;z-index:20;box-shadow:0 3px 12px #102E4620}.back-top[hidden]{display:none}
@media(max-width:1200px){.wrap{width:calc(100% - 44px)}.home-hero{gap:36px}.page-with-aside{gap:32px}.rules-layout,.about-layout{gap:30px}}
@media(max-width:920px){.brand-bar{height:63px;display:grid;grid-template-columns:40px minmax(0,1fr) auto;gap:10px}.menu-toggle{display:flex;align-items:center;justify-content:center;flex-direction:column;gap:5px;width:40px;height:40px;background:transparent;border:1px solid #C5D7E0;border-radius:9px}.menu-toggle span{width:19px;height:2px;background:var(--navy)}.brand{justify-content:center}.brand .media-frame img{max-height:30px;max-width:120px}.brand-wordmark,.brand-subtitle,.desktop-nav{display:none}.entry-link{margin:0;padding:6px 10px;font-size:13px;min-height:38px;display:flex;align-items:center;justify-content:center}.drawer-overlay{display:block;position:fixed;inset:0;background:rgba(7,24,36,.55);z-index:90;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .22s ease,visibility .22s ease}.mobile-drawer{display:block;position:fixed;inset:0 auto 0 0;z-index:91;width:min(86vw,340px);max-height:100dvh;overflow-y:auto;background:white;transform:translateX(-102%);visibility:hidden;transition:transform .22s ease,visibility .22s ease;padding:18px 21px 30px;box-shadow:6px 0 24px #102E4626}.menu-open{overflow:hidden}.menu-open .drawer-overlay{opacity:1;visibility:visible;pointer-events:auto}.menu-open .mobile-drawer{transform:translateX(0);visibility:visible}.drawer-heading{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:10px}.drawer-heading strong{font-size:20px;color:var(--heading)}.drawer-close{font-size:30px;line-height:1;width:42px;height:42px;border:1px solid var(--line);background:white;border-radius:7px}.drawer-label{font-size:12px;font-weight:800;color:var(--muted);margin:21px 0 8px}.mobile-drawer>a{display:block;padding:10px 13px;border-bottom:1px solid var(--line);font-size:16px;text-decoration:none;color:var(--heading);font-weight:700}.mobile-quick{display:flex;justify-content:space-around;gap:10px;flex-wrap:wrap;padding:15px 0}.mobile-quick a{font-size:13px;text-decoration:none;font-weight:700}.nojs-nav{display:flex;flex-wrap:wrap;gap:8px;padding:8px 0 14px}.nojs-nav a{padding:5px 8px;background:var(--mist);font-size:13px;border-radius:6px}.home-hero h1{font-size:36px}.reading-route{gap:13px}.page-with-aside{grid-template-columns:minmax(0,1fr) 230px}.rules-layout{grid-template-columns:180px minmax(0,1fr)}}
@media(max-width:760px){.home-hero,.split,.visual-band,.gallery-intro,.gallery-grid,.esports-split,.page-with-aside,.rules-layout,.about-layout{grid-template-columns:1fr}.home-hero{padding-top:35px}.home-hero>div:first-child{order:0}.home-hero>div:nth-child(2){order:1}.topic-grid{gap:0 22px}.focus-layout{grid-template-columns:1fr}.focus-side{grid-template-columns:1fr 1fr}.visual-band{gap:24px}.reading-route{grid-template-columns:repeat(2,minmax(0,1fr))}.fact-aside,.rules-toc,.about-aside{position:static}.page-with-aside{gap:6px}.rules-toc{order:0}.rules-content{order:1}.about-main{order:0}.about-aside{order:1}.esports-flow{grid-template-columns:1fr}.editorial-columns{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div:first-child{grid-column:1/-1}.mobile-guide{grid-template-columns:1fr 185px}.gallery-grid>div:nth-child(3){order:4}.gallery-grid>article:nth-child(4){order:3}}
@media(max-width:640px){body{font-size:15px;line-height:1.75}.wrap{width:calc(100% - 32px)}h1{font-size:27px}h2{font-size:22px}h3{font-size:18px}.lead{font-size:16px}.section{padding-block:37px}.section-heading{margin-bottom:22px}.home-hero{gap:22px;padding-bottom:40px}.home-hero h1{font-size:30px}.media-frame{padding:7px}.media-frame--hero{--media-limit:205px}.media-frame--feature{--media-limit:185px}.media-frame--card{--media-limit:145px}.media-frame--rules{--media-limit:175px}.media-frame--wide{--media-limit:135px}.media-frame--mobile{--media-limit:285px;max-width:250px}.topic-grid,.focus-side,.three-notes,.concept-pairs,.question-grid{grid-template-columns:1fr}.topic-grid{gap:0}.focus-main,.focus-side article{padding:20px}.focus-main h3{font-size:21px}.three-notes{gap:10px}.three-notes article{padding-left:12px}.rule-steps article,.rule-steps article:nth-child(2),.rule-steps article:nth-child(3){margin-left:0;padding:17px 16px;grid-template-columns:36px 1fr;gap:10px}.rule-steps article>span{font-size:23px}.page-intro{padding-block:22px 26px}.page-with-aside,.rules-layout,.about-layout{padding-block:22px 36px}.article-section{padding-block:25px}.phase-flow{grid-template-columns:1fr 1fr}.phase-flow div{padding:13px 11px}.local-nav{gap:6px}.local-nav a{font-size:13px;padding:5px 10px}.mobile-guide{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr;gap:15px}.footer-grid>div:first-child{grid-column:auto}.footer-bottom{display:block}.footer-bottom a{margin-top:10px!important}.reading-route{gap:20px}.site-footer{padding-top:34px}.transition-list li{grid-template-columns:46px 1fr;gap:10px}.transition-list li>span{font-size:24px}.editorial-columns{gap:18px}}
@media(max-width:380px){.brand-bar{grid-template-columns:40px minmax(0,1fr) auto;gap:5px}.entry-link{font-size:12px;padding-inline:8px}.brand .media-frame img{max-width:100px}.home-hero h1{font-size:28px}.button-row{gap:8px}.button{padding:9px 12px;font-size:14px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}