:root{--bg:#f4f7fa;--white:#fff;--pale:#eaf1f6;--mint:#e9f8f8;--navy:#102e46;--deep:#163c57;--teal:#13b8c5;--blue:#237bd3;--title:#18364b;--body:#344c60;--muted:#64798a;--line:#dce6ed;--footer:#0b2539;color-scheme:light}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;background:var(--bg);color:var(--body);font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif}a{color:#126ea8;text-underline-offset:4px}a:hover{color:#064f79}button{font:inherit;cursor:pointer}img{max-width:100%;height:auto}figure{margin:0}h1,h2,h3{color:var(--title);line-height:1.38;margin:0 0 .72em}h1{font-size:clamp(27px,3vw,36px)}h2{font-size:clamp(21px,2.4vw,27px)}h3{font-size:clamp(18px,1.8vw,21px)}p{margin:0 0 1.12em}strong{color:var(--title)}.container{max-width:1256px;padding-inline:28px;margin-inline:auto}.skip-link{position:absolute;z-index:100;top:-100px;left:15px;background:#fff;padding:9px 18px}.skip-link:focus{top:8px}:focus-visible{outline:3px solid var(--teal);outline-offset:3px}.site-header{background:#fff}.brand-strip{height:72px;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand-identity,.brand{display:flex;align-items:center;min-width:0;gap:14px}.brand{text-decoration:none;color:var(--title)}.brand-caption{font-size:13px;white-space:nowrap;color:var(--muted)}.brand-fallback{font-weight:800;white-space:nowrap;letter-spacing:.03em}.brand:has(img) .brand-fallback,.mobile-logo:has(img) .brand-fallback{display:none}.media-frame--logo{display:inline-flex;padding:0!important;border:0!important;background:transparent!important;width:auto!important;max-width:220px}.media-frame--logo img{display:block;max-height:38px;max-width:190px;width:auto;height:auto;object-fit:contain}.media-frame--logo.media-placeholder{min-height:0!important}.media-frame--logo.media-placeholder span{display:none}.register-link{display:inline-flex;align-items:center;justify-content:center;min-height:39px;padding:6px 17px;background:var(--deep);border-radius:9px;color:white;text-decoration:none;font-weight:700;white-space:nowrap;font-size:14px}.register-link:hover{background:#0c6385;color:white}.desktop-channels{background:var(--navy)}.channel-list{height:52px;display:flex;align-items:stretch;justify-content:space-between;gap:4px}.channel-list a{position:relative;display:flex;align-items:center;justify-content:center;color:#ebf5fa;text-decoration:none;font-size:15px;font-weight:600;min-width:0;padding:0 12px;white-space:nowrap}.channel-list a:hover{background:#20465f}.channel-list a[aria-current=page]{color:white;font-weight:800}.channel-list a[aria-current=page]:after{content:'';position:absolute;bottom:0;left:16px;right:16px;height:3px;background:var(--teal)}.mobile-bar,.mobile-drawer,.drawer-overlay,.nojs-nav{display:none}.crumb{font-size:13px;padding-top:20px;padding-bottom:12px;display:flex;gap:11px;color:var(--muted)}.crumb a{text-decoration:none}.page-intro{padding-block:20px 33px}.eyebrow,.kicker{font-size:12px;color:#177e95;font-weight:800;letter-spacing:.12em;text-transform:uppercase;margin-bottom:10px}.page-intro h1{max-width:930px}.lede{font-size:17px;line-height:1.85;max-width:830px;color:#466076}.page-section{margin-bottom:55px}.section-heading{border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:22px}.section-heading .eyebrow{display:block}.content-shell{max-width:1256px;margin:auto;padding:0 28px 46px}.content-panel{padding:27px 31px;background:white;border:1px solid var(--line);border-radius:13px}.reading-column{max-width:790px}.reading-column p,.article-flow p{max-width:76ch}.reading-column h2,.article-flow h2{margin-top:1.45em}.reading-column h2:first-child,.article-flow h2:first-child{margin-top:0}.muted-band,.pale-band{background:var(--pale);padding:27px;border-radius:12px}.mint-band{background:var(--mint);padding:24px 27px;border-radius:12px}.dark-band{background:var(--deep);color:#ecf7fa;padding:34px;border-radius:12px}.dark-band h2,.dark-band h3,.dark-band strong{color:white}.dark-band a{color:#a3eff7}.grid-2,.grid-3,.split-hero,.split-content,.feature-row,.magazine-main,.showcase-grid{display:grid;gap:30px;min-width:0}.grid-2>* ,.grid-3>* ,.split-hero>* ,.split-content>* ,.feature-row>* ,.magazine-main>* ,.showcase-grid>*{min-width:0}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.split-hero{grid-template-columns:1.08fr 1fr;align-items:center;gap:44px}.cover{padding:47px 0 56px}.cover h1{font-size:clamp(28px,3.5vw,43px);line-height:1.32}.cover .lede{font-size:17px}.button-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.btn{padding:10px 19px;border-radius:9px;text-decoration:none;display:inline-flex;align-items:center;font-weight:700}.btn-primary{color:white;background:var(--deep)}.btn-primary:hover{color:white;background:#075d80}.btn-secondary{border:1px solid #a8c4d5;color:var(--title);background:white}.media-frame{display:flex;justify-content:center;align-items:center;padding:8px;background:var(--pale);border-radius:14px;max-width:100%;min-width:0}.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:auto}.media-placeholder{min-height:115px;text-align:center;color:#728899;font-size:13px}.media-placeholder span{padding:12px}.media-frame--hero.media-placeholder{min-height:200px}.topic-directory{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 38px}.topic-line{border-top:1px solid var(--line);padding:20px 0}.topic-line h3{margin-bottom:7px}.topic-line p{font-size:15px;margin:0 0 8px}.topic-line a,.text-link{font-weight:700;text-decoration-thickness:1px}.magazine-main{grid-template-columns:2fr 1fr}.magazine-main .feature-story{padding:28px;background:#fff;border-left:4px solid var(--teal)}.story-stack{display:grid;gap:18px}.story-stack article{padding:24px;background:var(--pale);border-radius:12px}.feature-row{grid-template-columns:.95fr 1.1fr;align-items:center}.feature-row.reverse{grid-template-columns:1.1fr .95fr}.tinted-card{background:white;border:1px solid var(--line);padding:22px;border-radius:12px}.stepped-lessons{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px;align-items:start}.stepped-lessons article{padding:25px;border-top:4px solid var(--teal);background:white}.stepped-lessons article:nth-child(2){margin-top:22px}.stepped-lessons article:nth-child(3){margin-top:44px}.route-steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.route-steps article{border-top:2px solid var(--deep);padding-top:16px}.step-number{display:block;color:#148398;font-size:13px;font-weight:800;margin-bottom:10px}.split-content{grid-template-columns:minmax(0,2.3fr) minmax(220px,1fr);align-items:start}.side-index{padding:22px;background:var(--pale);border-radius:12px;font-size:14px}.side-index h2{font-size:19px}.side-index a{display:block;margin:10px 0}.anchor-nav{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 29px}.anchor-nav a{padding:8px 15px;border:1px solid #bed2de;background:white;border-radius:100px;text-decoration:none;font-weight:700;font-size:14px}.article-flow{background:white;border:1px solid var(--line);border-radius:13px;padding:32px}.article-flow h2{padding-top:4px}.article-flow h3{margin-top:24px}.article-flow section+section{margin-top:33px;padding-top:22px;border-top:1px solid var(--line)}.data-table-wrap{max-width:100%;overflow-x:auto;border:1px solid var(--line);border-radius:10px;margin:19px 0 24px;background:white}table{width:100%;border-collapse:collapse;min-width:560px;font-size:15px;line-height:1.65}caption{caption-side:top;text-align:left;font-weight:700;padding:12px 16px;color:var(--title)}th,td{padding:12px 15px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}th{background:#eaf1f6;color:var(--title);font-weight:700}tr:last-child td{border-bottom:0}.flow-list{list-style:none;margin:20px 0;padding:0;counter-reset:flow}.flow-list li{counter-increment:flow;padding:17px 18px 17px 60px;position:relative;border-left:2px solid #6da5bd;background:#f4f8fb;margin-bottom:10px}.flow-list li:before{content:counter(flow);position:absolute;top:15px;left:17px;background:var(--deep);color:white;border-radius:50%;width:27px;height:27px;text-align:center;line-height:27px;font-weight:700}.notice{border-left:4px solid #14aebb;background:var(--mint);padding:19px 22px;margin:22px 0}.fact-list{padding-left:22px}.fact-list li{margin-bottom:12px}.project-matrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.project-matrix article{padding:23px;background:white;border-top:4px solid var(--blue);border-radius:6px 6px 12px 12px}.project-matrix article:nth-child(2){border-color:var(--teal)}.project-matrix article:nth-child(3){border-color:#78a3bb}.showcase-grid{grid-template-columns:1fr 1fr;gap:36px}.showcase-grid>article:nth-child(even){margin-top:32px}.showcase-grid article{background:white;border-radius:12px;padding:20px;border:1px solid var(--line)}.showcase-grid h3{margin-top:14px}.related-band{background:#eaf1f6;padding:25px 28px;border-radius:12px;margin-top:37px}.related-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.related-links a{padding:15px;background:white;border:1px solid var(--line);text-decoration:none;border-radius:8px;font-weight:700;display:flex;justify-content:space-between;gap:12px}.faq-list details{border-bottom:1px solid var(--line);padding:17px 0}.faq-list summary{cursor:pointer;font-weight:700;color:var(--title);padding-right:15px}.faq-list details p{margin:10px 0 0}.service-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:36px}.service-sidebar{background:var(--pale);border-radius:12px;padding:22px;align-self:start}.service-sidebar a{display:block;margin:12px 0}.service-article{background:white;border-radius:12px;padding:31px;border:1px solid var(--line)}.service-article section+section{margin-top:37px;padding-top:22px;border-top:1px solid var(--line)}.service-article h2{margin-bottom:17px}.site-footer{background:var(--footer);color:#dcecf5;margin-top:38px;padding:42px 0 15px}.footer-grid{display:grid;grid-template-columns:1.6fr 1fr;gap:65px}.footer-title{color:white;font-size:23px;font-weight:800}.footer-title span{font-size:11px;display:block;letter-spacing:.16em;color:#9ed0dc}.footer-note{font-size:13px;color:#aac4d0;max-width:560px}.footer-grid nav{display:grid;grid-template-columns:1fr 1fr;gap:3px 13px}.footer-grid nav strong{grid-column:1/-1;color:white}.footer-grid nav a,.footer-bottom a{color:#dcecf5;text-decoration:none;font-size:13px}.footer-grid nav a:hover,.footer-bottom a:hover{text-decoration:underline}.footer-bottom{border-top:1px solid #285068;margin-top:25px;padding-top:13px;display:flex;gap:20px;justify-content:space-between;align-items:center;font-size:12px;color:#b7d0dd}.mobile-quick{display:none}.back-to-top{position:fixed;right:19px;bottom:20px;border:0;border-radius:10px;padding:8px 14px;background:var(--navy);color:white;z-index:9}.back-to-top[hidden]{display:none!important}#competition-formats,#court-sports,#tactical-reading,#team-systems,#visual-culture,#rule-index,#mahjong-basics,#baccarat-learning,#probability-notes,#editorial-policy{scroll-margin-top:24px}
@media(max-width:1024px){.container,.content-shell{padding-inline:22px}.channel-list a{padding-inline:7px;font-size:14px}.split-hero{gap:26px}.feature-row{gap:22px}}
@media(max-width:920px){.brand-strip,.desktop-channels{display:none}.mobile-bar{display:flex;height:64px;align-items:center;justify-content:space-between;gap:12px}.mobile-logo{min-width:0;text-decoration:none;display:flex;align-items:center;justify-content:center;color:var(--title);font-weight:800}.mobile-logo .media-frame--logo img{max-height:30px;max-width:min(40vw,180px)}.menu-toggle{border:1px solid var(--line);background:#fff;border-radius:8px;width:40px;height:40px;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;flex-shrink:0}.menu-toggle span{display:block;width:19px;height:2px;background:var(--navy)}.mobile-bar .register-link{padding:6px 10px;min-height:38px}.drawer-overlay{display:block;position:fixed;inset:0;background:#081b2b9c;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s;z-index:30}.mobile-drawer{display:block;position:fixed;inset:0 auto 0 0;width:min(86vw,340px);background:#fff;transform:translateX(-105%);visibility:hidden;pointer-events:none;transition:transform .22s,visibility .22s;z-index:31;padding:22px 20px;overflow-y:auto;box-shadow:5px 0 20px #001b2b20}.drawer-open{overflow:hidden}.drawer-open .drawer-overlay{opacity:1;visibility:visible;pointer-events:auto}.drawer-open .mobile-drawer{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:15px}.drawer-top strong{font-size:20px}.menu-close{border:0;background:var(--pale);height:39px;width:39px;border-radius:8px;font-size:24px;line-height:1}.drawer-label{font-size:12px;letter-spacing:.1em;color:var(--muted);font-weight:800;border-bottom:1px solid var(--line);margin:18px 0 6px}.mobile-drawer>a{display:block;padding:11px 12px;text-decoration:none;color:var(--title);border-radius:8px}.mobile-drawer>a[aria-current=page]{background:var(--mint);border-left:3px solid var(--teal);font-weight:800}.nojs-nav{display:flex;flex-wrap:wrap;gap:12px;padding-block:12px;background:var(--pale)}.nojs-nav a{font-size:14px}.mobile-quick{display:flex;flex-wrap:wrap;gap:15px;padding-top:20px;padding-bottom:15px}.mobile-quick a{font-size:13px}.footer-grid{gap:28px}}
@media(max-width:760px){.grid-2,.grid-3,.split-hero,.split-content,.feature-row,.feature-row.reverse,.magazine-main,.showcase-grid,.service-layout{grid-template-columns:1fr}.cover{padding-top:26px;padding-bottom:38px}.topic-directory,.project-matrix{grid-template-columns:1fr 1fr}.stepped-lessons{grid-template-columns:1fr}.stepped-lessons article:nth-child(n){margin-top:0}.route-steps{grid-template-columns:1fr 1fr}.related-links{grid-template-columns:1fr}.side-index{order:2}.service-sidebar{order:2}.service-article{order:1}.showcase-grid>article:nth-child(n){margin-top:0}.footer-grid{grid-template-columns:1fr}.article-flow{padding:23px}.page-intro{padding-top:10px}.content-panel{padding:22px}.page-section{margin-bottom:40px}}
@media(max-width:640px){body{font-size:15px;line-height:1.78}.container,.content-shell{padding-inline:16px}.page-intro h1{font-size:clamp(25px,6vw,29px)}.cover h1{font-size:clamp(27px,7vw,32px)}.page-intro .lede,.cover .lede{font-size:15px}.page-section{margin-bottom:34px}.topic-directory,.project-matrix,.route-steps{grid-template-columns:1fr}.topic-line{padding:17px 0}.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 img{max-height:30px}.media-placeholder{min-height:80px}.media-frame--hero.media-placeholder{min-height:115px}.article-flow,.service-article{padding:19px}.section-heading{margin-bottom:15px}.dark-band{padding:24px}.muted-band,.pale-band,.mint-band{padding:20px}.footer-bottom{align-items:flex-start;flex-direction:column;gap:8px}.footer-grid nav{grid-template-columns:1fr 1fr}.mobile-bar{gap:6px}.brand-fallback{font-size:16px}.anchor-nav a{padding:6px 11px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}
