@import "https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;700&display=swap";:root{--bg:#080808;--panel:#0f0f0f;--border:#1e1e1e;--text:#d6d6d6;--text-dim:#555;--cell-bg:#111;--t2:#999;--t4:#bbb;--t8:#c84;--t16:#da4;--t32:#e8c400;--t64:#f90;--t128:#f60;--t256:#f30;--t512:#f06;--t1024:#a4f;--t2048:#00e87a;--thigh:#00e87a}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{background:var(--bg)}body{background:var(--bg);color:var(--text);justify-content:center;align-items:flex-start;min-height:100vh;padding:24px 16px 48px;font-family:JetBrains Mono,ui-monospace,SF Mono,Menlo,monospace;font-size:14px;display:flex}#app{flex-direction:column;gap:0;width:100%;max-width:460px;display:flex}.header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:baseline;margin-bottom:14px;padding-bottom:10px;display:flex}.brand{letter-spacing:2px;color:var(--t32);font-size:22px;font-weight:700}.cursor{animation:1s step-end infinite blink}@keyframes blink{50%{opacity:0}}.scores{gap:16px;display:flex}.score-box{text-align:right;font-size:11px}.score-label{color:var(--text-dim);letter-spacing:.1em;text-transform:uppercase}.score-value{color:var(--text);font-size:16px;font-weight:700;line-height:1.2}.score-delta{color:var(--t32);pointer-events:none;font-size:13px;font-weight:700;animation:.6s ease-out forwards score-pop;position:absolute}@keyframes score-pop{0%{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(-28px)}}.controls{color:var(--text-dim);justify-content:space-between;align-items:center;margin-bottom:14px;font-size:11px;display:flex}.hint{letter-spacing:.04em}.btn-new{border:1px solid var(--border);color:var(--text-dim);letter-spacing:.08em;text-transform:uppercase;cursor:pointer;background:0 0;padding:5px 12px;font-family:inherit;font-size:11px;transition:border-color .15s,color .15s}.btn-new:hover{border-color:var(--text-dim);color:var(--text)}.grid-wrap{position:relative}.grid-bg{background:var(--panel);border:1px solid var(--border);grid-template-columns:repeat(4,1fr);gap:10px;padding:10px;display:grid}.cell{aspect-ratio:1;background:var(--cell-bg);border:1px dashed #1a1a1a}.tile-layer{pointer-events:none;position:absolute;inset:0}.tile{border:1px solid #0000;justify-content:center;align-items:center;font-weight:700;transition:transform .1s;display:flex;position:absolute}.tile-value{-webkit-user-select:none;user-select:none;line-height:1}.tile[data-v="2"]{color:var(--t2);border-color:#333;font-size:28px}.tile[data-v="4"]{color:var(--t4);border-color:#3a3a3a;font-size:28px}.tile[data-v="8"]{color:var(--t8);border-color:#2a1a0a;font-size:28px}.tile[data-v="16"]{color:var(--t16);border-color:#320;font-size:26px}.tile[data-v="32"]{color:var(--t32);border-color:#3a3000;font-size:26px}.tile[data-v="64"]{color:var(--t64);border-color:#3a2000;font-size:26px}.tile[data-v="128"]{color:var(--t128);border-color:#3a1500;font-size:22px}.tile[data-v="256"]{color:var(--t256);border-color:#3a0a00;font-size:22px}.tile[data-v="512"]{color:var(--t512);border-color:#3a001a;font-size:22px}.tile[data-v="1024"]{color:var(--t1024);border-color:#2a0044;font-size:18px}.tile[data-v="2048"]{color:var(--t2048);border-color:#042;font-size:18px;font-weight:700}.tile[data-v="4096"]{color:var(--thigh);border-color:#042;font-size:16px}.tile[data-v="8192"]{color:var(--thigh);border-color:#042;font-size:14px}@keyframes tile-appear{0%{transform:var(--tile-pos) scale(0);opacity:0}60%{transform:var(--tile-pos) scale(1.12);opacity:1}to{transform:var(--tile-pos) scale(1)}}@keyframes tile-merge{0%{transform:var(--tile-pos) scale(1)}30%{transform:var(--tile-pos) scale(1.18)}to{transform:var(--tile-pos) scale(1)}}.tile-new{animation:.18s ease-out tile-appear}.tile-merge{animation:.15s ease-out tile-merge}.overlay{border:1px solid var(--border);background:#080808e0;flex-direction:column;justify-content:center;align-items:center;gap:16px;display:flex;position:absolute;inset:0}.overlay-title{letter-spacing:2px;text-transform:uppercase;font-size:20px;font-weight:700}.overlay-title--win{color:var(--t2048)}.overlay-title--over{color:var(--t256)}.overlay-sub{color:var(--text-dim);letter-spacing:.06em;font-size:11px}.overlay-actions{gap:10px;display:flex}.btn-overlay{letter-spacing:.1em;text-transform:uppercase;cursor:pointer;border:1px solid var(--border);color:var(--text-dim);background:0 0;padding:7px 16px;font-family:inherit;font-size:11px;transition:border-color .15s,color .15s}.btn-overlay:hover{border-color:var(--text);color:var(--text)}.btn-overlay--primary{border-color:var(--t2048);color:var(--t2048)}.btn-overlay--primary:hover{background:var(--t2048);color:#000}.footer{color:var(--text-dim);border-top:1px solid var(--border);justify-content:space-between;margin-top:20px;padding-top:10px;font-size:11px;display:flex}@media (width<=480px){.hint{display:none}}