:root{color-scheme:dark;--bg:#080b14;--panel:#151a27;--panel2:#0e1320;--edge:#8290a8;--ink:#f4f6ff;--muted:#a8b0c2;--accent:#67d4ff;--purple:#7554d8;font-family:"Courier New",ui-monospace,monospace}*{box-sizing:border-box}body{margin:0;min-height:100svh;color:var(--ink);background:#05070c;background-image:linear-gradient(rgba(103,212,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(103,212,255,.035) 1px,transparent 1px),radial-gradient(circle at 25% 10%,#18234a 0,transparent 40%);background-size:24px 24px,24px 24px,auto}.desktop{min-height:100svh;display:grid;place-items:center;padding:22px}.window{width:min(720px,100%);background:var(--panel);border:2px solid;border-color:#aab4c5 #32394a #32394a #aab4c5;box-shadow:10px 10px 0 rgba(0,0,0,.55),0 0 50px rgba(103,212,255,.12)}.titlebar{height:38px;display:flex;align-items:center;justify-content:space-between;padding:4px 5px 4px 9px;background:linear-gradient(90deg,#173c7a,#593384);font-weight:700;letter-spacing:.02em}.app-title{display:flex;align-items:center;gap:9px}.mini-icon{display:grid;place-items:center;width:23px;height:23px;color:#06101b;background:var(--accent);border:1px outset #fff}.controls{display:flex;gap:3px}.controls span{display:grid;place-items:center;width:27px;height:25px;color:#090c14;background:#bac2d2;border:2px outset #eef2f7;font-family:Arial,sans-serif}.controls span:last-child{background:#e65a70;color:white}.menubar{height:31px;display:flex;align-items:center;gap:23px;padding:0 12px;border-bottom:1px solid #424b60;background:#171d2b;color:#cbd2df;font-size:13px}.menubar span:first-letter,.menubar a:first-letter{text-decoration:underline}.menubar a{margin-left:auto;color:#9de5ff;text-decoration:none}.content{padding:25px}.game-header{display:flex;justify-content:space-between;gap:20px;align-items:flex-start}.eyebrow{color:var(--accent);font-size:12px;letter-spacing:.18em}.game-header h1{font-family:Impact,"Arial Black",sans-serif;font-size:clamp(54px,11vw,86px);line-height:.9;letter-spacing:3px;margin:6px 0 8px;color:#f5f7ff;text-shadow:4px 4px 0 #593384}.game-header p{margin:0;color:var(--muted);font-size:13px;max-width:330px}.scores{display:flex;gap:8px}.scorebox{min-width:86px;text-align:center;padding:9px 10px;background:#090d16;border:2px inset #737d91}.scorebox span{display:block;font-size:10px;color:var(--muted);letter-spacing:.1em}.scorebox strong{display:block;margin-top:5px;color:#ffd56a;font-size:20px}.toolbar{display:flex;align-items:center;justify-content:space-between;margin:21px 0 12px}.toolbar button,.message button{font:700 13px "Courier New",monospace;padding:9px 14px;color:#0b1020;background:#9ce5ff;border:2px outset #d7f6ff;cursor:pointer}.toolbar button:active,.message button:active,.dpad button:active{border-style:inset;transform:translate(1px,1px)}.hint{font-size:11px;color:var(--muted)}.board-wrap{position:relative;margin:auto;width:min(100%,500px);touch-action:none}.board{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;padding:10px;aspect-ratio:1;background:#090d16;border:3px inset #6c768a}.tile{display:grid;place-items:center;aspect-ratio:1;min-width:0;border:2px solid #2d3546;background:#141b29;color:#ccd4e3;font-family:Impact,"Arial Black",sans-serif;font-size:clamp(25px,7vw,48px);transition:background .12s,color .12s}.tile[data-value="2"]{background:#273247}.tile[data-value="4"]{background:#34405a}.tile[data-value="8"]{background:#185c75;color:#c9f5ff}.tile[data-value="16"]{background:#176f78;color:#d1ffef}.tile[data-value="32"]{background:#28715b;color:#e2ffe7}.tile[data-value="64"]{background:#887329;color:#fff3bd}.tile[data-value="128"]{background:#a85d24;color:#fff1cf;font-size:clamp(21px,6vw,42px)}.tile[data-value="256"]{background:#b44940;color:#fff;font-size:clamp(21px,6vw,42px)}.tile[data-value="512"]{background:#9a3c6d;color:#fff;font-size:clamp(21px,6vw,42px)}.tile[data-value="1024"]{background:#6b45b5;color:#fff;box-shadow:inset 0 0 20px #a78fff;font-size:clamp(17px,5vw,35px)}.tile[data-value="2048"]{background:#d4a82e;color:#10121b;box-shadow:0 0 24px #ffd759;font-size:clamp(17px,5vw,35px)}.tile[data-large="true"]{background:#d4a82e;color:#111;font-size:clamp(14px,4vw,29px)}.message{position:absolute;inset:10px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:13px;text-align:center;background:rgba(7,10,17,.91);border:2px solid var(--accent);backdrop-filter:blur(3px)}.message[hidden]{display:none}.message strong{font-size:clamp(28px,7vw,52px);color:#ffd56a;text-shadow:3px 3px #5c3481}.message span{color:#c3ccdc}.dpad{display:none;grid-template-columns:repeat(3,52px);grid-template-rows:repeat(2,42px);justify-content:center;gap:5px;margin-top:16px}.dpad button{font-size:18px;color:#eaf7ff;background:#303a4e;border:2px outset #8390a8}.dpad button:nth-child(1){grid-column:2}.dpad button:nth-child(2){grid-column:1}.dpad button:nth-child(3){grid-column:2}.dpad button:nth-child(4){grid-column:3}.statusbar{display:flex;gap:5px;padding:5px;background:#111622}.statusbar span{flex:1;padding:4px 7px;border:1px inset #4e586b;color:#9ca7ba;font-size:11px}.statusbar span:last-child{flex:0 0 auto}@media(max-width:620px){.desktop{padding:8px}.window{box-shadow:5px 5px 0 rgba(0,0,0,.55)}.content{padding:16px 12px}.game-header{align-items:flex-end}.game-header p{display:none}.scores{flex-direction:column}.scorebox{min-width:80px;padding:5px 8px}.scorebox strong{font-size:17px}.toolbar{margin:14px 0 9px}.hint{display:none}.board{gap:6px;padding:7px}.dpad{display:grid}.menubar{gap:14px}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}