:root{--ink:#163c2d;--deep:#244b38;--cream:#fffdf6;--lime:#b8ee45;--red:#e43e39;--muted:#6e7d73}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%;background:#edf6e4}
body{color:var(--ink);font-family:Inter,Arial,Helvetica,sans-serif;overscroll-behavior:none}
.game-shell{min-height:100vh;display:grid;place-items:center;overflow:hidden;position:relative;padding:clamp(14px,4vw,50px);background:radial-gradient(circle at 8% 3%,#fffce1 0,transparent 32%),radial-gradient(circle at 92% 92%,#d0edb4 0,transparent 38%),linear-gradient(145deg,#f7f8e7,#d9ecc8)}
.game-shell:before,.game-shell:after{content:"";position:fixed;width:220px;height:220px;border:1px solid #8eae7840;border-radius:50%;pointer-events:none}
.game-shell:before{top:-130px;left:7%}.game-shell:after{right:-110px;bottom:-95px}
.glow{position:fixed;width:34vw;height:34vw;border-radius:50%;filter:blur(90px);opacity:.25;pointer-events:none}.glow-one{background:#fff8a8;top:-20vw;right:-5vw}.glow-two{background:#a8d77e;bottom:-20vw;left:-8vw}
.game-card{width:min(1280px,100%);background:linear-gradient(135deg,#fffef9,#fbfaef);border:1px solid #d4ddc9;border-radius:4px;box-shadow:0 30px 80px #49613b30,0 2px 0 #fff inset;padding:clamp(16px,3vw,36px);position:relative}
.topbar{display:flex;align-items:end;justify-content:space-between;gap:22px;margin-bottom:23px}.brand{display:flex;align-items:center;gap:17px}.brand-mark{width:48px;height:48px;position:relative;flex:0 0 auto}.brand-mark i{position:absolute;width:24px;height:24px;border:7px solid var(--lime);border-radius:50%}.brand-mark i:nth-child(1){left:0;bottom:0}.brand-mark i:nth-child(2){left:12px;bottom:11px}.brand-mark i:nth-child(3){left:24px;bottom:0;background:var(--lime)}
.eyebrow{font:700 9px/1 monospace;letter-spacing:.23em;margin:0 0 9px;color:var(--muted)}h1{margin:0;font:900 clamp(32px,5vw,61px)/.78 Arial Black,Arial,sans-serif;letter-spacing:-.075em}h1 span{color:var(--red)}.subtitle{margin:10px 0 0;font-size:11px;color:var(--muted);letter-spacing:.03em}
.scores{display:flex;border:1px solid #c8c8ba;background:#fffefa;box-shadow:0 4px 12px #35522d0c}.scores div{min-width:87px;padding:10px 15px}.scores div+div{border-left:1px solid #d8d5cb}.scores small{display:block;font:700 8px monospace;letter-spacing:.18em;color:var(--muted);margin-bottom:3px}.scores strong{font:900 24px/1.1 monospace}
.play-layout{display:grid;grid-template-columns:minmax(0,1fr) 235px;gap:18px;align-items:stretch}.board-wrap{min-width:0;background:#96b471;border:7px solid var(--deep);box-shadow:0 5px 0 #153a29,0 13px 30px #35522d30;padding:0 7px 7px}.board-head{height:28px;display:flex;align-items:center;justify-content:space-between;color:#f4ffe7;font:700 8px monospace;letter-spacing:.16em}.board-head span{display:flex;align-items:center;gap:7px}.board-head i{width:7px;height:7px;border-radius:50%;background:#d5e9bb;box-shadow:0 0 0 3px #d5e9bb20}.board-head i.live{background:#c9fb4b;box-shadow:0 0 8px #c9fb4b}
.board{aspect-ratio:3/2;width:100%;position:relative;overflow:hidden;background:#e5f4ce;border:1px solid #769358;transition:box-shadow .16s,filter .16s}.board canvas{display:block;width:100%;height:100%;touch-action:none;-webkit-user-select:none;user-select:none}.board.shake{animation:shake .32s linear}.board.boosting{box-shadow:inset 0 0 0 3px #d9ff66,inset 0 0 38px #d9ff6655;animation:boostPulse .38s ease-in-out infinite alternate}
.overlay{position:absolute;inset:0;z-index:5;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#173a2b;text-align:center;background:#f2f8e8dc;backdrop-filter:blur(4px)}.overlay.hidden{display:none}.snake-badge{display:flex;align-items:center;margin-bottom:18px;filter:drop-shadow(0 5px 4px #47652c25)}.snake-badge span{width:26px;height:26px;background:linear-gradient(135deg,#c8f656,#72b62e);border:3px solid #4a8624;border-radius:50%;margin-left:-7px}.snake-badge span:first-child{margin-left:0}.snake-badge span:last-of-type{width:35px;height:30px}.snake-badge b{font-size:13px;letter-spacing:5px;margin-left:-25px;margin-right:5px;color:#173a2b;z-index:2;transform:translateY(-1px)}
.overlay p{margin:0 0 8px;color:#d62e31;font:900 11px monospace;letter-spacing:.25em}.overlay h2{margin:0 0 24px;font-size:clamp(20px,3vw,34px);letter-spacing:-.025em}.overlay button{cursor:pointer;border:0;background:var(--lime);color:var(--ink);padding:14px 20px;font-weight:900;letter-spacing:.06em;box-shadow:5px 5px 0 var(--deep);transition:transform .15s,box-shadow .15s}.overlay button:hover{transform:translate(-2px,-2px);box-shadow:7px 7px 0 var(--deep)}.overlay button:active{transform:translate(3px,3px);box-shadow:2px 2px 0 var(--deep)}.overlay button b{margin-left:16px}.overlay small{margin-top:15px;color:var(--muted);font-size:10px}.hidden{display:none!important}
.nickname-form{width:min(440px,82%);margin:0}.nickname-form>label{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}.nickname-form>div{display:flex;gap:8px}.nickname-form input{min-width:0;flex:1;border:2px solid #31563e;background:#fffef8;color:var(--ink);padding:13px 14px;font:800 15px Arial,sans-serif;outline:none;box-shadow:0 3px 0 #31563e22}.nickname-form input:focus{border-color:#73a92e;box-shadow:0 0 0 4px #b8ee4538}.nickname-form button{padding-inline:16px;white-space:nowrap}.nickname-form>span{display:block;min-height:17px;margin-top:11px;color:#c52f32;font:700 10px monospace}
.score-pop{position:absolute;z-index:4;left:50%;top:18%;transform:translate(-50%,-10px) scale(.8);opacity:0;background:#fffdf4;color:#d62e31;border:1px solid #d9cdb7;padding:8px 12px;font:900 10px monospace;letter-spacing:.13em;pointer-events:none}.score-pop.show{animation:scorePop .8s ease-out}
.leaderboard{border:1px solid #c9cfbe;background:#fffef8;box-shadow:0 8px 22px #35522d17;padding:18px 16px;display:flex;flex-direction:column;min-width:0}.leaderboard-head{display:flex;align-items:center;justify-content:space-between;border-bottom:2px solid var(--ink);padding-bottom:12px}.leaderboard-head p{margin:0 0 4px;color:var(--red);font:800 8px monospace;letter-spacing:.18em}.leaderboard-head h2{margin:0;font:900 27px/1 Arial Black,Arial,sans-serif;letter-spacing:-.04em}.trophy{display:grid;place-items:center;width:37px;height:37px;border-radius:50%;background:var(--lime);color:var(--deep);font-size:18px;box-shadow:3px 3px 0 var(--deep)}.leaderboard ol{list-style:none;padding:0;margin:9px 0 15px;counter-reset:rank}.leaderboard li{counter-increment:rank;display:grid;grid-template-columns:24px minmax(0,1fr) 34px;align-items:center;gap:7px;padding:11px 2px;border-bottom:1px solid #e1e3d9}.leaderboard li:before{content:counter(rank);display:grid;place-items:center;width:21px;height:21px;border:1px solid #bdc4b3;color:var(--muted);border-radius:50%;font:800 9px monospace}.leaderboard li:first-child:before{background:#f4cf52;border-color:#e1b927;color:#59460d}.leaderboard li:nth-child(2):before{background:#dfe3e1;border-color:#c0c6c3;color:#45504b}.leaderboard li:nth-child(3):before{background:#dca66b;border-color:#c78d51;color:#5c361a}.leaderboard li span{display:none}.leaderboard li b{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:12px}.leaderboard li strong{text-align:right;font:900 15px monospace;color:var(--red)}.leaderboard li.leaderboard-empty{opacity:.55}.leaderboard li.leaderboard-empty:before{content:"–"}.player-card{margin-top:auto;border:1px solid #d4d7cb;background:#f2f7e9;padding:11px 12px}.player-card small{display:block;margin-bottom:4px;color:var(--muted);font:700 7px monospace;letter-spacing:.15em}.player-card b{display:block;overflow:hidden;text-overflow:ellipsis;font-size:12px}.leaderboard-status{min-height:12px;margin:9px 1px 0;color:var(--muted);font:700 8px monospace;line-height:1.4}.leaderboard-status.error{color:#c52f32}
footer{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-top:19px}.hint{display:flex;align-items:center;gap:10px}.hint>span{font:800 9px monospace;letter-spacing:.16em;transform:rotate(-90deg)}.keys{display:grid;grid-template-columns:repeat(3,23px);gap:3px}.keys kbd{display:grid;place-items:center;height:20px;border:1px solid #b8b1a6;box-shadow:0 2px #b8b1a6;background:white;font:700 9px monospace}.keys kbd:first-child{grid-column:2}.hint p,.tip{font-size:11px;color:var(--muted)}.tip i{display:inline-block;width:7px;height:7px;margin-right:6px;background:var(--red);border-radius:50%}
.mobile-controls{display:none;grid-template-columns:repeat(3,42px);gap:5px}.mobile-controls button{height:38px;border:1px solid #b8b1a6;background:white;color:var(--ink);font-weight:900;box-shadow:0 3px #b8b1a6;touch-action:manipulation}.mobile-controls button:first-child{grid-column:2}.mobile-controls button:nth-child(2){grid-column:1}.mobile-controls button:active{transform:translateY(2px)}
.action-controls{display:flex;align-items:center;gap:7px}.action-controls button{cursor:pointer;border:1px solid #aeb7a4;color:var(--ink);font:800 8px monospace;letter-spacing:.08em;touch-action:none}.boost-button{display:flex;align-items:center;gap:7px;min-height:38px;padding:6px 12px;background:var(--lime);box-shadow:0 3px var(--deep)}.boost-button span{font-size:6px;letter-spacing:.12em;opacity:.7}.boost-button[aria-pressed="true"]{transform:translateY(2px);box-shadow:0 1px var(--deep);background:#d8ff68}.sound-button{min-height:34px;padding:6px 10px;background:#fff}.sound-button[aria-pressed="false"]{opacity:.55}
@keyframes scorePop{0%{opacity:0;transform:translate(-50%,5px) scale(.75)}24%{opacity:1;transform:translate(-50%,-7px) scale(1.05)}70%{opacity:1}100%{opacity:0;transform:translate(-50%,-25px) scale(.95)}}
@keyframes shake{0%,100%{transform:translateX(0)}20%{transform:translateX(-7px)}40%{transform:translateX(6px)}60%{transform:translateX(-4px)}80%{transform:translateX(2px)}}
@keyframes boostPulse{from{filter:saturate(1)}to{filter:saturate(1.18) brightness(1.035)}}
@media(max-width:900px){.play-layout{grid-template-columns:1fr}.leaderboard{display:block}.leaderboard ol{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:5px;margin-bottom:10px}.leaderboard li{display:block;text-align:center;border:1px solid #e1e3d9;padding:8px 4px}.leaderboard li:before{margin:0 auto 5px}.leaderboard li b{display:block}.leaderboard li strong{display:block;text-align:center;margin-top:4px}.player-card{display:inline-block;min-width:180px}.leaderboard-status{display:inline-block;margin-left:10px}}
@media(max-width:760px){.game-shell{padding:10px}.game-card{padding:15px}.topbar{align-items:center;margin-bottom:14px}.brand-mark,.subtitle{display:none}.scores div{min-width:58px;padding:7px 8px}.scores strong{font-size:18px}.scores small{font-size:7px}.board-wrap{border-width:5px;padding:0 4px 4px}.board-head{height:23px}.hint,.tip{display:none}.mobile-controls{display:grid;margin:auto}.action-controls{margin-left:auto}.overlay small{display:none}.nickname-form>div{display:block}.nickname-form button{width:100%;margin-top:8px}.leaderboard ol{grid-template-columns:1fr}.leaderboard li{display:grid;grid-template-columns:24px minmax(0,1fr) 34px;text-align:left}.leaderboard li:before{margin:0}.leaderboard li b{display:block}.leaderboard li strong{text-align:right;margin:0}}
@media(max-width:460px){.topbar{display:block}.scores{margin-top:15px;width:100%}.scores div{flex:1}.board-head span:last-child{display:none}footer{flex-wrap:wrap;justify-content:center}.mobile-controls{margin:0}.action-controls{margin:0}.boost-button{min-height:42px}.sound-button{min-height:38px}}
@media(max-height:650px){.game-shell{padding:8px}.game-card{width:min(900px,100%);padding:10px 14px}.topbar{margin-bottom:9px}h1{font-size:29px}.subtitle,.brand-mark{display:none}.board{max-height:64vh;margin:auto}footer{margin-top:7px}.board-head{height:23px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}