:root{--bg:#0a0a14;--surface:#ffffff08;--border:#ffffff0f;--text:#e4e4e7;--muted:#71717a}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);justify-content:center;align-items:center;min-height:100vh;font-family:system-ui,-apple-system,sans-serif;display:flex}#app{text-align:center;width:480px;max-width:95vw}header{justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:20px;display:flex}header h1{color:#a855f7;font-size:36px;font-weight:700}header p{color:var(--muted);margin-top:2px;font-size:12px}.scores{gap:8px;display:flex}.score-box{background:var(--surface);border:1px solid var(--border);text-align:center;border-radius:8px;min-width:70px;padding:6px 16px}.score-box .label{text-transform:uppercase;color:var(--muted);margin-bottom:2px;font-size:10px;display:block}.score-box span:last-child{color:var(--text);font-size:20px;font-weight:700}.best-box span:last-child{color:#06b6d4}.game-wrapper{aspect-ratio:1;width:100%;position:relative}.grid{background:var(--surface);border:1px solid var(--border);border-radius:12px;grid-template-rows:repeat(4,1fr);grid-template-columns:repeat(4,1fr);gap:8px;width:100%;height:100%;padding:8px;display:grid}.cell{background:#ffffff05;border-radius:8px}.tiles{pointer-events:none;position:absolute;inset:8px}.tile{width:calc(25% - 6px);height:calc(25% - 6px);left:calc(var(--c) * 25% + 2px);top:calc(var(--r) * 25% + 2px);border-radius:8px;justify-content:center;align-items:center;font-weight:700;transition:left .12s,top .12s;animation:.15s appear;display:flex;position:absolute}@keyframes appear{0%{transform:scale(0)}to{transform:scale(1)}}.tile-2{color:#cbd5e1;background:#1a1a2e;font-size:28px}.tile-4{color:#a78bfa;background:#1e1a3a;font-size:28px}.tile-8{color:#c084fc;background:#2d1a4a;font-size:28px}.tile-16{color:#e879f9;background:#3b1a5a;font-size:28px}.tile-32{color:#f472b6;background:#4a1a6a;font-size:28px}.tile-64{color:#fb7185;background:#591a7a;font-size:28px}.tile-128{color:#86efac;background:#1a2e1a;font-size:24px;box-shadow:0 0 16px #86efac26}.tile-256{color:#4ade80;background:#1a3e1a;font-size:24px;box-shadow:0 0 16px #4ade8026}.tile-512{color:#22c55e;background:#1a4e1a;font-size:24px;box-shadow:0 0 20px #22c55e33}.tile-1024{color:#22d3ee;background:#1a2e3a;font-size:20px;box-shadow:0 0 20px #22d3ee33}.tile-2048{color:#fbbf24;background:#2d1a5a;font-size:20px;box-shadow:0 0 24px #fbbf2440}.actions{margin-top:20px}#restart{border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;border-radius:10px;padding:10px 28px;font-size:14px;font-weight:500;transition:background-color .2s,border-color .2s}#restart:hover{background:#a855f71a;border-color:#a855f74d}.hint{color:var(--muted);margin-top:10px;font-size:11px}.message{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);color:var(--text);z-index:100;background:#0a0a14b3;justify-content:center;align-items:center;font-size:28px;font-weight:700;animation:.3s fadeIn;display:flex;position:fixed;inset:0}.message.hidden{display:none}.message.over{color:#f87171}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}