:root{--bg-primary: #0f0f1a;--bg-secondary: #1a1a2e;--bg-tertiary: #252542;--text-primary: #ffffff;--text-secondary: #a0a0b8;--text-muted: #6a6a80;--accent-primary: #6366f1;--accent-secondary: #8b5cf6;--accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);--tile-2: #3b82f6;--tile-4: #6366f1;--tile-8: #8b5cf6;--tile-16: #a855f7;--tile-32: #d946ef;--tile-64: #ec4899;--tile-128: #f43f5e;--tile-256: #ef4444;--tile-512: #f97316;--tile-1024: #eab308;--tile-2048: #22c55e;--tile-super: linear-gradient(135deg, #f97316, #ef4444, #ec4899);--grid-bg: rgba(255, 255, 255, .05);--cell-bg: rgba(255, 255, 255, .08);--grid-gap: 12px;--cell-size: 80px;--border-radius: 16px;--border-radius-sm: 8px;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .2);--shadow-md: 0 4px 16px rgba(0, 0, 0, .3);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .4);--shadow-glow: 0 0 20px rgba(99, 102, 241, .4);--font-family: "Outfit", -apple-system, BlinkMacSystemFont, sans-serif;--transition-fast: .1s ease;--transition-normal: .2s ease;--transition-slow: .3s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-tap-highlight-color:transparent}body{font-family:var(--font-family);background:var(--bg-primary);color:var(--text-primary);min-height:100vh;display:flex;justify-content:center;align-items:center;overflow:hidden;background-image:radial-gradient(ellipse at top,rgba(99,102,241,.15) 0%,transparent 50%),radial-gradient(ellipse at bottom,rgba(139,92,246,.1) 0%,transparent 50%)}#app{width:100%;max-width:480px;padding:20px;display:flex;flex-direction:column;gap:20px}.header{display:flex;flex-direction:column;gap:16px}.header-top{display:flex;justify-content:space-between;align-items:center}.title{font-size:4rem;font-weight:800;background:var(--accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-shadow:0 0 40px rgba(99,102,241,.5);letter-spacing:-2px}.scores-container{display:flex;gap:12px}.score-box{background:var(--bg-tertiary);border-radius:var(--border-radius-sm);padding:8px 16px;text-align:center;min-width:80px;box-shadow:var(--shadow-sm);border:1px solid rgba(255,255,255,.05)}.score-label{display:block;font-size:.7rem;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:1px}.score-value{display:block;font-size:1.5rem;font-weight:700;color:var(--text-primary)}.header-bottom{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}.tagline{font-size:.95rem;color:var(--text-secondary)}.tagline strong{color:var(--accent-primary)}.controls{display:flex;gap:8px;align-items:center}.btn{font-family:var(--font-family);font-weight:600;border:none;cursor:pointer;transition:all var(--transition-normal);border-radius:var(--border-radius-sm)}.btn-new-game{background:var(--accent-gradient);color:#fff;padding:10px 20px;font-size:.9rem;box-shadow:var(--shadow-sm),var(--shadow-glow)}.btn-new-game:hover{transform:translateY(-2px);box-shadow:var(--shadow-md),0 0 30px #6366f180}.btn-new-game:active{transform:translateY(0)}.btn-icon{background:var(--bg-tertiary);color:var(--text-secondary);padding:10px;display:flex;align-items:center;justify-content:center;border:1px solid rgba(255,255,255,.05)}.btn-icon:hover{background:var(--bg-secondary);color:var(--text-primary)}.btn-icon.muted{color:var(--text-muted)}.language-selector{display:flex;gap:4px;background:var(--bg-tertiary);padding:4px;border-radius:var(--border-radius-sm);border:1px solid rgba(255,255,255,.05)}.btn-lang{background:transparent;color:var(--text-muted);padding:6px 10px;font-size:.8rem;border-radius:6px}.btn-lang:hover{color:var(--text-secondary)}.btn-lang.active{background:var(--accent-gradient);color:#fff}.game-container{position:relative;touch-action:none}.game-board{position:relative;background:var(--grid-bg);border-radius:var(--border-radius);padding:var(--grid-gap);box-shadow:var(--shadow-lg);border:1px solid rgba(255,255,255,.08);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);aspect-ratio:1}.grid-background{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--grid-gap)}.grid-cell{aspect-ratio:1;background:var(--cell-bg);border-radius:var(--border-radius-sm)}.tiles-container{position:absolute;top:var(--grid-gap);left:var(--grid-gap);right:var(--grid-gap);bottom:var(--grid-gap)}.tile{position:absolute;display:flex;align-items:center;justify-content:center;font-weight:700;border-radius:var(--border-radius-sm);transition:transform .12s ease-out;-webkit-user-select:none;user-select:none;will-change:transform}.tile-2{background:var(--tile-2);color:#fff;font-size:2rem;box-shadow:0 0 20px #3b82f666}.tile-4{background:var(--tile-4);color:#fff;font-size:2rem;box-shadow:0 0 20px #6366f166}.tile-8{background:var(--tile-8);color:#fff;font-size:2rem;box-shadow:0 0 20px #8b5cf666}.tile-16{background:var(--tile-16);color:#fff;font-size:1.8rem;box-shadow:0 0 20px #a855f766}.tile-32{background:var(--tile-32);color:#fff;font-size:1.8rem;box-shadow:0 0 20px #d946ef66}.tile-64{background:var(--tile-64);color:#fff;font-size:1.8rem;box-shadow:0 0 20px #ec489966}.tile-128{background:var(--tile-128);color:#fff;font-size:1.6rem;box-shadow:0 0 25px #f43f5e80}.tile-256{background:var(--tile-256);color:#fff;font-size:1.6rem;box-shadow:0 0 25px #ef444480}.tile-512{background:var(--tile-512);color:#fff;font-size:1.6rem;box-shadow:0 0 25px #f9731680}.tile-1024{background:var(--tile-1024);color:#1a1a2e;font-size:1.4rem;box-shadow:0 0 30px #eab30880}.tile-2048{background:var(--tile-2048);color:#fff;font-size:1.4rem;box-shadow:0 0 40px #22c55e99;animation:pulse-glow 1.5s ease-in-out infinite}.tile-super{background:var(--tile-super);color:#fff;font-size:1.2rem;box-shadow:0 0 40px #f9731699;animation:rainbow-glow 2s linear infinite}@keyframes tile-appear{0%{transform:scale(0);opacity:0}50%{transform:scale(1.1)}to{transform:scale(1);opacity:1}}@keyframes tile-merge{0%{transform:scale(1)}50%{transform:scale(1.2)}to{transform:scale(1)}}@keyframes pulse-glow{0%,to{box-shadow:0 0 30px #22c55e80}50%{box-shadow:0 0 50px #22c55ecc}}@keyframes rainbow-glow{0%{filter:hue-rotate(0deg)}to{filter:hue-rotate(360deg)}}.tile-new{animation:tile-appear .2s ease-out}.tile-merged{animation:tile-merge .2s ease-out}.game-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:#0f0f1ae6;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;border-radius:var(--border-radius);opacity:0;visibility:hidden;transition:all var(--transition-slow);z-index:100}.game-overlay.active{opacity:1;visibility:visible}.overlay-content{text-align:center;padding:40px}.overlay-content h2{font-size:2.5rem;font-weight:800;margin-bottom:16px;background:var(--accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.win-overlay .overlay-content h2{background:linear-gradient(135deg,#22c55e,#84cc16);-webkit-background-clip:text;background-clip:text}.final-score{font-size:1.2rem;color:var(--text-secondary);margin-bottom:24px}.final-score span:last-child{font-size:2rem;font-weight:700;color:var(--text-primary);display:block;margin-top:8px}.btn-large{padding:14px 32px;font-size:1.1rem}.win-buttons{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.btn-continue{background:linear-gradient(135deg,#22c55e,#16a34a);color:#fff;padding:12px 24px;font-size:1rem;box-shadow:0 0 20px #22c55e66}.btn-continue:hover{transform:translateY(-2px);box-shadow:0 0 30px #22c55e99}#score-popup-container{position:fixed;top:0;left:0;right:0;bottom:0;pointer-events:none;z-index:1000}.score-popup{position:absolute;font-size:1.2rem;font-weight:700;color:var(--accent-primary);text-shadow:0 0 10px rgba(99,102,241,.5);animation:score-pop .8s ease-out forwards;pointer-events:none}@keyframes score-pop{0%{opacity:1;transform:translateY(0) scale(1)}to{opacity:0;transform:translateY(-50px) scale(1.2)}}.footer{text-align:center;padding:12px;color:var(--text-muted);font-size:.85rem}.footer strong{color:var(--text-secondary)}@media (max-width: 480px){:root{--grid-gap: 8px}#app{padding:12px;gap:12px}.title{font-size:3rem}.score-box{padding:6px 12px;min-width:65px}.score-label{font-size:.6rem}.score-value{font-size:1.2rem}.header-bottom{flex-direction:column;align-items:stretch;gap:10px}.tagline{text-align:center;font-size:.85rem}.controls{justify-content:center}.tile{font-size:1.5rem!important}.tile-1024,.tile-2048,.tile-super{font-size:1.2rem!important}.overlay-content{padding:24px}.overlay-content h2{font-size:2rem}}@media (max-width: 360px){:root{--grid-gap: 6px}.title{font-size:2.5rem}.tile{font-size:1.3rem!important}.tile-1024,.tile-2048,.tile-super{font-size:1rem!important}}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}.btn:focus-visible{outline:2px solid var(--accent-primary);outline-offset:2px}