:root{--bg: #0f1220;--panel: #1b2036;--cell: #262c47;--text: #e8eaf6;--muted: #8b91b5;--accent: #f59e0b;--radius: 14px}.landing{position:fixed;inset:0;z-index:100;background:var(--bg);display:flex;align-items:center;justify-content:center;transition:opacity .5s ease,transform .5s ease}.landing--hidden{opacity:0;transform:scale(1.08);pointer-events:none}#particle-canvas{position:absolute;inset:0;z-index:0}.landing-content{position:relative;z-index:1;text-align:center;animation:landing-in .8s cubic-bezier(.16,1,.3,1) both}@keyframes landing-in{0%{opacity:0;transform:translateY(24px) scale(.96)}to{opacity:1;transform:translateY(0) scale(1)}}.landing-icon{margin-bottom:20px;animation:icon-float 4s ease-in-out infinite}@keyframes icon-float{0%,to{transform:translateY(0)}50%{transform:translateY(-8px)}}.landing-title{font-size:clamp(2.8rem,10vw,4.5rem);font-weight:900;letter-spacing:-.04em;line-height:1;background:linear-gradient(135deg,#e8eaf6 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merge-bounce{0%{transform:scale(.6)}60%{transform:scale(1.12)}to{transform:scale(1)}}.v2{background:linear-gradient(145deg,#3d4668,#4a5580);color:var(--text)}.v4{background:linear-gradient(145deg,#4a5580,#576285);color:var(--text)}.v8{background:linear-gradient(145deg,#e09200,#fbbf24);color:#1e1b4b;box-shadow:0 2px 12px #f59e0b59}.v16{background:linear-gradient(145deg,#f97316,#fb923c);color:#1e1b4b;box-shadow:0 2px 14px #f9731659}.v32{background:linear-gradient(145deg,#ef4444,#f87171);color:#fff;box-shadow:0 2px 16px #ef444459}.v64{background:linear-gradient(145deg,#dc2626,#ef4444);color:#fff;box-shadow:0 2px 18px #dc262666}.v128{background:linear-gradient(145deg,#059669,#34d399);color:#fff;font-size:clamp(1rem,5vw,1.7rem);box-shadow:0 2px 20px #34d39966}.v256{background:linear-gradient(145deg,#059669,#10b981);color:#fff;font-size:clamp(1rem,5vw,1.7rem);box-shadow:0 3px 22px #10b98173}.v512{background:linear-gradient(145deg,#06b6d4,#22d3ee);color:#fff;font-size:clamp(1rem,5vw,1.7rem);box-shadow:0 3px 26px #22d3ee73}.v1024{background:linear-gradient(145deg,#7c3aed,#a78bfa);color:#fff;font-size:clamp(.9rem,4.5vw,1.5rem);box-shadow:0 4px 28px #7c3aed80}.v2048{background:linear-gradient(145deg,#f59e0b,#fde68a,#f59e0b);color:#1e1b4b;font-size:clamp(.9rem,4.5vw,1.5rem);box-shadow:0 0 40px #f59e0b99,0 0 80px #f59e0b4d;animation:glow-pulse 2s ease-in-out infinite}.vsuper{background:linear-gradient(145deg,#e879f9,#d946ef);color:#fff;font-size:clamp(.8rem,4vw,1.3rem);box-shadow:0 0 32px #d946ef80,0 0 64px #d946ef40}@keyframes glow-pulse{0%,to{box-shadow:0 0 40px #f59e0b99,0 0 80px #f59e0b4d}50%{box-shadow:0 0 50px #f59e0bcc,0 0 100px #f59e0b66}}.ring{position:absolute;border:3px solid var(--accent);border-radius:50%;pointer-events:none;transform:translate(-50%,-50%) scale(.3);animation:ring-out .5s ease-out forwards;z-index:5}.ring-big{border-width:5px;box-shadow:0 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#f59e0b4d}button:hover{filter:brightness(1.08);box-shadow:0 4px 20px #f59e0b73}button:active{transform:scale(.96)}button:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:var(--panel);color:var(--muted);box-shadow:inset 0 0 0 1px #ffffff1a}.btn-secondary:hover{color:var(--text);box-shadow:inset 0 0 0 1px #fff3;filter:none}.overlay button.hidden{display:none}.brand-row{display:flex;align-items:center;gap:8px}.icon-btn{background:transparent;color:var(--accent);border:none;border-radius:8px;padding:2px 6px;font-size:1.1rem;cursor:pointer;transition:transform .12s ease,filter .12s ease;box-shadow:none}.icon-btn:hover{filter:brightness(1.2);box-shadow:none}.icon-btn:active{transform:scale(.9)}.hint-msg{text-align:center;color:var(--accent);font-weight:600;font-size:.92rem;padding:8px 0 2px;animation:hint-in .3s ease}.hint-msg.hidden{display:none}@keyframes 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a{color:var(--muted);text-decoration:none;transition:color .12s ease}.hint a:hover{color:var(--text)}.board.size-3 .tile{font-size:clamp(1.5rem,8vw,2.6rem)}.board.size-5 .tile{font-size:clamp(.85rem,4vw,1.45rem)}@media(prefers-reduced-motion:reduce){.tile.spawn,.tile.merge,.board.shake,.gain,.ring,.combo-float,.new-best,.v2048,.board-wrap:before,.hint-msg,.landing-content,.landing-icon,.cascade-num.pop,#app.reveal>*{animation:none}.hint-msg{opacity:1;transform:none}.v2048{box-shadow:0 0 40px #f59e0b99,0 0 80px #f59e0b4d}.landing{transition:none}.landing--hiding .landing-content{transition:none;opacity:0}.cascade-num{opacity:1;transform:none}#app.reveal>*{opacity:1;transform:none}button,.mode-btn,.icon-btn{transition:none}}