:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#18334d;background:#fafaf6;font-synthesis:none;--blue:#093a66;--gold:#eda023;--muted:#687888}*{box-sizing:border-box}body{margin:0}button,a{-webkit-tap-highlight-color:transparent}button,.button{font:inherit;font-weight:650;cursor:pointer}button:disabled{opacity:.55;cursor:wait}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible{outline:3px solid #eda023;outline-offset:4px}[hidden]{display:none!important}header{height:102px;max-width:1280px;padding:18px 40px;margin:auto;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #e4e8e9}.brand{display:flex;gap:14px;align-items:center;font-weight:800;letter-spacing:2px;font-size:20px}.brand small{display:block;font-size:9px;letter-spacing:3px;margin-top:6px;color:#687888}.school-logo{width:48px;height:60px;object-fit:contain}.header-right{display:flex;align-items:center;gap:20px;font-size:14px}main{max-width:1280px;margin:auto;padding:52px 40px 64px;min-height:calc(100vh - 184px)}h1,h2,h3,p{margin-top:0}h1{font-size:44px;line-height:1.15;letter-spacing:-1.6px;margin-bottom:18px}h2{font-size:26px;letter-spacing:-.7px}p{color:var(--muted);line-height:1.7}.eyebrow{display:block;color:#4a7398;font-size:10px;font-weight:800;letter-spacing:2px;margin-bottom:17px}.login-layout{display:grid;grid-template-columns:1.2fr 1fr;gap:80px;align-items:center;min-height:560px}.hero-copy h1{font-size:56px;line-height:1.15}.hero-copy em{font-style:normal;color:#c28422}.hero-copy p{max-width:450px;font-size:17px}.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:28px}.tags span{font-size:11px;padding:9px 12px;border:1px solid #dfe6e6;border-radius:30px;color:#4a7398}.login-card{background:#fff;border:1px solid #e4e8e9;border-radius:26px;padding:44px 36px;box-shadow:0 20px 70px #18334d08;text-align:center}.chess-icon{font-size:80px;line-height:1.1;color:#093a66;margin-bottom:25px}.login-card .eyebrow{font-size:9px}.login-card p{font-size:14px}.button{display:flex;align-items:center;justify-content:space-between;background:var(--blue);color:white;padding:15px 20px;border:0;border-radius:10px;width:100%;font-size:14px}.google{justify-content:center;gap:15px;margin-top:28px}.google-letter{font-size:21px}.domain{font-size:11px;color:#4a7398;margin-top:14px}.access-note{border-top:1px solid #e9edee;padding-top:20px;margin-top:28px;font-size:11px;color:#7b8994;line-height:1.6}.welcome{display:flex;align-items:center;justify-content:space-between;margin-bottom:36px}.welcome h1{font-size:36px}.welcome p{margin-bottom:0;font-size:14px}.pill{display:inline-flex;align-items:center;white-space:nowrap;border-radius:30px;background:#eef2f3;color:#4a7398;padding:8px 12px;font-size:10px;font-weight:650}.portal-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:28px}.game-card{padding:28px;background:#edf2f4;border:1px solid #e0e7ec;border-radius:20px}.card-top{display:flex;align-items:center;justify-content:space-between;gap:12px}.card-top .pill{background:#fff}.online-dot{color:#4f7460;font-size:10px}.online-dot:before{content:'●';color:#4b9267;margin-right:6px}.game-art{height:170px;display:flex;align-items:center;justify-content:center;background:repeating-conic-gradient(#d8e2e8 0% 25%,#e5ecef 0% 50%) 50%/72px 72px;margin:24px 0;border-radius:12px;overflow:hidden;color:var(--blue);gap:20px;font-family:Georgia,serif;font-size:84px;text-shadow:0 4px 0 #ffffffaa}.game-art span:nth-child(2){font-size:105px;color:#b78028}.game-card h2{font-size:30px;margin-bottom:10px}.game-card p{font-size:13px;max-width:360px}.game-card small{display:block;font-size:10px;text-align:center;margin-top:15px;color:#687888}.lobby{background:#fff;padding:28px;border:1px solid #e3e8ea;border-radius:20px}.section-title{display:flex;align-items:center;justify-content:space-between}.section-title .eyebrow{font-size:9px;margin-bottom:10px}.section-title h2{font-size:23px;margin-bottom:8px}.text-button{background:none;color:var(--blue);border:0;padding:8px;font-size:12px}.subtle{font-size:12px}.empty{margin:30px 0;text-align:center;padding:40px 24px;border:1px dashed #dce4e8;border-radius:12px}.empty .empty-icon{font-size:36px;color:#9aacba;margin-bottom:14px}.empty h3{font-size:16px;margin-bottom:6px}.empty p{font-size:12px;margin:0}.room{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #edf0f1;padding:16px 0;gap:12px}.room strong{font-size:13px;display:block}.room small{display:block;color:#758697;font-size:11px;margin-top:6px}.room button{background:#eef3f6;color:var(--blue);border:0;border-radius:8px;padding:10px 15px;font-size:12px;white-space:nowrap}.coming{display:flex;align-items:center;gap:20px;margin-top:28px;border:1px solid #e4e8e9;border-radius:16px;padding:24px}.coming h3{font-size:14px;margin-bottom:5px}.coming p{font-size:12px;margin:0}.coming .pill{margin-left:auto}.mini-icon{display:grid;place-items:center;flex-shrink:0;width:42px;height:42px;background:#fbf0d8;color:#b57c22;border-radius:12px;font-size:24px}footer{max-width:1280px;margin:auto;padding:24px 40px;border-top:1px solid #e4e8e9;font-size:10px;color:#7b8994;display:flex;align-items:center;justify-content:space-between;gap:20px}footer div{display:flex;align-items:center;gap:10px}footer img{width:100px;height:30px;object-fit:contain}.match-heading{display:flex;justify-content:space-between;margin-bottom:20px}.match-grid{display:grid;grid-template-columns:minmax(0,600px) 1fr;gap:32px;max-width:1050px;margin:auto}.board{display:grid;grid-template-columns:repeat(8,1fr);width:100%;aspect-ratio:1;border:7px solid #183b54;border-radius:8px;overflow:hidden}.square{position:relative;display:grid;place-items:center;aspect-ratio:1;border:0;border-radius:0;padding:0;font-family:"DejaVu Sans","Segoe UI Symbol",serif;font-size:clamp(22px,4.5vw,56px);line-height:1;background:#edf0e4;color:#111}.square.dark{background:#75919e}.square.white-piece{color:#fff;text-shadow:1px 1px 1px #15384f,-1px -1px 1px #15384f,1px -1px 1px #15384f,-1px 1px 1px #15384f}.square.selected{background:#edbe60;box-shadow:inset 0 0 0 3px #eda023}.square .coordinate{position:absolute;bottom:2px;left:3px;font:9px system-ui;color:#23475b;opacity:.8}.player-bar{padding:15px 4px;font-size:13px;font-weight:650;min-height:48px}.match-info{background:#fff;border:1px solid #e4e8e9;border-radius:16px;padding:28px;height:fit-content}.match-info h3{font-size:13px;margin-top:28px}.match-info p{font-size:13px}.secondary,.danger{border:1px solid #dce3e7;background:#f6f8f9;color:var(--blue);padding:12px 14px;border-radius:8px;font-size:12px}.match-info>button{display:block;width:100%;margin-top:10px}.danger{color:#a64242;background:#fff7f7;border-color:#f0dede}.moves{font-size:12px;max-height:220px;overflow:auto;padding-left:28px;line-height:2;color:#4a7398}.moves li{padding-left:5px}.tip{border-top:1px solid #e7ecee;padding-top:18px;font-size:11px!important}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#183b54;color:white;padding:16px 24px;box-shadow:0 8px 24px #0002;border-radius:12px;max-width:90vw;font-size:13px;z-index:10}dialog{border:0;border-radius:18px;padding:28px;max-width:min(430px,90vw);color:#18334d}dialog::backdrop{background:#102f4a88}.promotion-options,.dialog-actions{display:flex;gap:8px;flex-wrap:wrap}.promotion-options button{padding:14px;border:1px solid #dce3e7;background:#eef3f6;border-radius:8px;color:#093a66}@media(max-width:850px){header{padding:16px 22px;height:88px}main{padding:32px 22px 40px}.login-layout{gap:32px}.hero-copy h1{font-size:40px}.login-card{padding:30px 22px}.portal-grid{grid-template-columns:1fr 1fr;gap:18px}.game-card,.lobby{padding:22px}.welcome h1{font-size:30px}.match-grid{grid-template-columns:minmax(0,1.5fr) minmax(210px,1fr);gap:20px}.match-info{padding:20px}footer{padding:20px 22px}}@media(max-width:620px){.login-layout,.portal-grid,.match-grid{grid-template-columns:1fr}.login-layout{min-height:auto}.hero-copy h1{font-size:38px}.hero-copy p{font-size:14px}.login-card{margin-top:8px}.tags{margin-top:18px}.welcome{align-items:flex-start;gap:12px}.welcome>.pill{display:none}.welcome h1{font-size:28px}.welcome .eyebrow{font-size:8px}.brand{font-size:16px;gap:10px}.brand small{font-size:8px;letter-spacing:2px}.school-logo{width:35px;height:45px}.header-right{gap:5px;font-size:11px;max-width:40%}#student{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.game-art{height:140px}.coming{padding:18px;gap:12px}.coming .pill{display:none}footer{flex-direction:column;align-items:flex-start;gap:12px}.square{font-size:clamp(23px,8.5vw,48px)}.match-grid{gap:20px}.board{border-width:5px}.match-heading .pill{font-size:9px}.match-info h2{font-size:23px}.moves{max-height:150px}h1{letter-spacing:-1px}}

.computer-options{display:grid;gap:10px;margin:22px 0;padding-top:18px;border-top:1px solid #ddd}.computer-options label{font-weight:600}.computer-options select{padding:12px;border:1px solid #ccd4dd;border-radius:10px;background:white;color:#093a66;font:inherit}

#chess-tutorial{width:min(640px,92vw);max-width:640px;max-height:88vh;overflow:auto;box-sizing:border-box}#tutorial-content{line-height:1.7;font-size:15px}.tutorial-heading,.tutorial-navigation{display:flex;justify-content:space-between;align-items:center;gap:12px}.tutorial-navigation{margin-top:24px}.tutorial-board{max-width:340px;margin:12px auto}.tutorial-board .square{font-size:30px}.tutorial-target{box-shadow:inset 0 0 0 4px #eda023!important}.tutorial-heading .eyebrow{font-size:10px}#learn-chess{width:100%;margin-top:12px}

.social-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:24px}.player-code{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.player-code strong{font-size:26px;color:#093a66;letter-spacing:2px}.challenge-input{display:flex;gap:8px;margin:10px 0}.challenge-input input{min-width:0;flex:1;padding:12px;border:1px solid #ccd4dd;border-radius:10px;font:inherit}.challenge-row{display:flex;gap:8px;align-items:center;flex-wrap:wrap;border-top:1px solid #e7ecee;padding:12px 0}.challenge-row span{flex:1;min-width:130px}.ranking-scroll{overflow:auto}.ranking-table{width:100%;border-collapse:collapse;font-size:13px}.ranking-table th,.ranking-table td{text-align:left;padding:12px 8px;border-bottom:1px solid #e7ecee}.ranking-mine{background:#fff4dd;font-weight:600}@media(max-width:850px){.social-grid{grid-template-columns:1fr}}

.games-catalog{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;align-items:stretch}.catalog-card{display:flex;flex-direction:column}.catalog-card p{max-width:none}.catalog-card .tags{margin:0 0 22px}.catalog-card>.button{margin-top:auto}.catalog-soon{border:1px dashed #d5dfe5;border-radius:20px;padding:32px;display:flex;flex-direction:column;justify-content:center;align-items:flex-start;background:#f3f5f3}.catalog-soon .mini-icon{margin-bottom:28px}.catalog-soon h2{font-size:23px}.catalog-soon p{font-size:14px}.game-breadcrumb{padding-left:0;margin-bottom:24px}#challenge-form{padding:18px;background:#f6f8fa;border:1px solid #e2e8ed;border-radius:14px;margin:20px 0}#challenge-form label{display:block;font-size:12px;font-weight:700;color:#093a66;margin-bottom:10px}.challenge-input{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px;margin:0}.challenge-input input{width:100%;height:48px;background:white;text-transform:uppercase;letter-spacing:1px;outline-offset:2px}.challenge-input input::placeholder{text-transform:none;letter-spacing:0;color:#8794a1}.challenge-input input:focus{outline:2px solid #eda023;border-color:#eda023}.challenge-input #send-challenge{width:auto;min-width:116px;height:48px;justify-content:center;padding:0 22px;white-space:nowrap}#challenge-help{margin:10px 0 0;font-size:11px;line-height:1.5}.challenge-row>.button{width:auto;justify-content:center}.player-code{background:#edf3f7;border-radius:12px;padding:14px 16px;justify-content:space-between}.social-grid>.lobby{min-width:0}@media(max-width:1000px){.games-catalog{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:620px){.games-catalog{grid-template-columns:1fr}.catalog-soon{padding:24px}.challenge-input{grid-template-columns:minmax(0,1fr) auto;gap:8px}.challenge-input #send-challenge{min-width:96px;padding:0 12px}#challenge-form{padding:14px}.player-code strong{font-size:22px}}@media(max-width:360px){.challenge-input{grid-template-columns:1fr}.challenge-input #send-challenge{width:100%}}

.match-heading{gap:10px;flex-wrap:wrap;align-items:center}.room button:disabled{opacity:.5;cursor:not-allowed}

.admin-login{display:block;margin-top:18px;line-height:1.6}.admin-metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;margin-bottom:28px}.admin-metrics article{display:flex;flex-direction:column;gap:12px;background:white;border:1px solid #e3e8ea;border-radius:18px;padding:24px}.admin-metrics span{font-size:13px;font-weight:650;color:#4a7398}.admin-metrics strong{font-size:42px;color:#093a66}.admin-metrics small{font-size:11px;line-height:1.6;color:#687888}@media(max-width:850px){.admin-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:400px){.admin-metrics{gap:10px}.admin-metrics article{padding:16px}.admin-metrics strong{font-size:34px}}

.access-control{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:24px}.access-control h2{font-size:23px;margin-bottom:10px}.access-control p{margin:0;font-size:13px}.access-control>.button{width:auto;min-width:190px;justify-content:center;flex-shrink:0}.access-control .eyebrow{margin-bottom:12px}#locked{max-width:620px;margin:40px auto}#locked h1{font-size:34px}#locked-message{margin-top:16px}@media(max-width:620px){.access-control{flex-direction:column;align-items:stretch}.access-control>.button{width:100%}}

/* Fit school laptops and touch screens without hiding page overflow. */
.portal-grid,.match-grid,.social-grid,.games-catalog{min-width:0}
.portal-grid>*,.match-grid>*,.games-catalog>*,.admin-metrics>*{min-width:0}
.room>div,.welcome>div,.access-control>div,.section-title>div{min-width:0}
.room strong,.player-bar,.ranking-table td,.welcome h1,.header-right{overflow-wrap:anywhere}
.room button{flex-shrink:0;min-height:44px}
.section-title,.welcome{gap:16px;flex-wrap:wrap}
.text-button,.secondary,.danger,.button{min-height:44px}
#student{max-width:260px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.header-right{min-width:0}.brand{flex-shrink:0}
.ranking-scroll{max-width:100%;overscroll-behavior-inline:contain}
.ranking-table th{font-size:12px}.ranking-table td:first-child{min-width:120px}
dialog{max-height:90dvh;overflow-y:auto;overscroll-behavior:contain}
#chess-tutorial{max-height:88dvh}.tutorial-navigation{flex-wrap:wrap}
input,select{font-size:16px!important}
.square{touch-action:manipulation}.board{container-type:inline-size;grid-template-rows:repeat(8,minmax(0,1fr))}
.square{min-width:0;min-height:0;font-size:clamp(20px,8.5cqw,56px)}
@media(min-width:760px){
 .match-grid{grid-template-columns:minmax(300px,min(600px,calc(100dvh - 270px))) minmax(240px,1fr);align-items:start}
 .player-bar{min-height:40px;padding:10px 4px}
 .match-info{padding:20px}.match-info h2{font-size:24px;margin-bottom:14px}
 .match-info .eyebrow{margin-bottom:12px}.match-info h3{margin-top:20px}
 .moves{max-height:150px}.match-info .tip{margin-bottom:0}
}
@media(min-width:760px) and (max-height:820px){
 header{height:80px;padding-top:10px;padding-bottom:10px}
 .school-logo{height:50px;width:40px}
 main{padding-top:24px;padding-bottom:28px;min-height:calc(100dvh - 150px)}
 .welcome{margin-bottom:24px}.welcome h1{font-size:32px}
 .login-layout{min-height:0;gap:40px}.hero-copy h1{font-size:44px}
 .login-card{padding:28px}.chess-icon{font-size:60px;margin-bottom:16px}
 .game-art{height:130px;margin:18px 0}.game-card,.lobby{padding:24px}
}
@media(max-width:1050px) and (min-width:760px){
 .portal-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px}
 .social-grid{grid-template-columns:1fr}.admin-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:759px){
 .match-grid,.login-layout,.portal-grid{grid-template-columns:minmax(0,1fr)}
 .match-grid{max-width:580px}.match-info{padding:22px}.board{max-width:100%}
 .square{font-size:clamp(20px,8.5cqw,52px)}
 header{height:auto;min-height:80px;gap:12px}.header-right{max-width:42%}
 main{padding:24px 18px 36px}.game-card,.lobby{padding:20px}
 .welcome h1{font-size:28px}.welcome>.pill{display:none}
 .access-control{flex-direction:column;align-items:stretch}.access-control>.button{width:100%}
 #student{max-width:160px}.social-grid{gap:18px}
}
@media(max-width:400px){
 header{padding:12px}.brand{font-size:13px;letter-spacing:1px;gap:7px}.brand small{font-size:7px;letter-spacing:1px}
 .school-logo{width:29px;height:38px}.header-right{gap:0;max-width:40%}#student{max-width:90px;font-size:10px}
 main{padding-left:12px;padding-right:12px}.game-card,.lobby{padding:16px}
 .card-top{flex-wrap:wrap}.game-art{gap:10px}.game-art span{font-size:66px}.game-art span:nth-child(2){font-size:80px}
 .challenge-input{grid-template-columns:1fr}.challenge-input #send-challenge{width:100%}
 .admin-metrics{grid-template-columns:1fr 1fr}.admin-metrics small{font-size:10px}
 .tutorial-heading{align-items:flex-start}.tutorial-heading .eyebrow{letter-spacing:1px}
}

#developer-users{margin-top:24px}.users-pagination{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:18px}#users-total{margin-top:16px}#users-list td{min-width:120px}#users-search-form input{min-width:0;width:100%;padding:12px;border:1px solid #ccd4dd;border-radius:10px;background:white}