:root{--grid-bg:#bbada0;--cell-bg:#eee4da59;--grid-gap:12px;--tile-2-bg:#eee4da;--tile-2-color:#776e65;--tile-4-bg:#ede0c8;--tile-4-color:#776e65;--tile-8-bg:#f2b179;--tile-8-color:#f9f6f2;--tile-16-bg:#f59563;--tile-16-color:#f9f6f2;--tile-32-bg:#f67c5f;--tile-32-color:#f9f6f2;--tile-64-bg:#f65e3b;--tile-64-color:#f9f6f2;--tile-128-bg:#edcf72;--tile-128-color:#f9f6f2;--tile-256-bg:#edcc61;--tile-256-color:#f9f6f2;--tile-512-bg:#edc850;--tile-512-color:#f9f6f2;--tile-1024-bg:#edc53f;--tile-1024-color:#f9f6f2;--tile-2048-bg:#edc22e;--tile-2048-color:#f9f6f2;--tile-super-bg:#3c3a32;--tile-super-color:#f9f6f2;--animation-speed:.15s}body{min-height:100%;color:var(--foreground);background:var(--background);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;flex-direction:column;font-family:"Rounded Mplus 1c",ヒラギノ丸ゴ Pro W4,Hiragino Maru Gothic Pro,Microsoft YaHei,system-ui,sans-serif;display:flex}.game-container{-webkit-user-select:none;user-select:none;flex-direction:column;gap:20px;max-width:500px;margin:0 auto;padding:20px;font-family:inherit;display:flex}.header{justify-content:space-between;align-items:center;display:flex}.title{color:#776e65;letter-spacing:-2px;margin:0;font-size:80px;font-weight:800}.score-container{gap:10px;display:flex}.score-box{color:#fff;text-align:center;background:#bbada0;border-radius:8px;min-width:80px;padding:10px 20px}.score-label{text-transform:uppercase;font-size:13px;display:block}.score-value{font-size:25px;font-weight:700}.controls{justify-content:space-between;align-items:flex-end;gap:10px;display:flex}.mode-controls{flex-direction:column;flex-grow:1;gap:8px;display:flex}.mode-btn{color:#f9f6f2;cursor:pointer;background:#bbada0;border:none;border-radius:8px;flex-grow:1;padding:10px 20px;font-size:16px;font-weight:700;transition:all .2s}.mode-btn.active{background:#f2b179;box-shadow:0 0 10px #f2b17980}.mode-btn:hover{opacity:.9}.new-game-btn{color:#f9f6f2;cursor:pointer;white-space:nowrap;background:#8f7a66;border:none;border-radius:8px;padding:10px 24px;font-size:18px;font-weight:700;transition:transform .1s,background .2s}.new-game-btn:hover{background:#7f6a56}.new-game-btn:active{transform:scale(.95)}.zen-indicator{background:#f2b1791a;border:1px dashed #f2b179;border-radius:8px;justify-content:center;align-items:center;gap:8px;margin-bottom:-10px;padding:6px;animation:.3s ease-out fadeIn;display:flex}.zen-icon{font-size:16px}.zen-text{color:#f2b179;text-transform:uppercase;letter-spacing:1px;font-size:13px;font-weight:700}@keyframes fadeIn{0%{opacity:0;transform:translateY(-5px)}to{opacity:1;transform:translateY(0)}}.board{background:var(--grid-bg);aspect-ratio:1;width:100%;padding:var(--grid-gap);gap:var(--grid-gap);border-radius:12px;grid-template-rows:repeat(4,1fr);grid-template-columns:repeat(4,1fr);display:grid;position:relative}.cell{background:var(--cell-bg);border-radius:8px;width:100%;height:100%}.board.zen-mode-active .cell:nth-child(-n+4){background:#f2b17933;position:relative;box-shadow:inset 0 0 15px #f2b1794d}.board.zen-mode-active .cell:nth-child(-n+4):after{content:"✨";opacity:.4;pointer-events:none;font-size:20px;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.tile-container{top:var(--grid-gap);left:var(--grid-gap);right:var(--grid-gap);bottom:var(--grid-gap);pointer-events:none;position:absolute}.tile{width:calc((100% - var(--grid-gap) * 3) / 4);height:calc((100% - var(--grid-gap) * 3) / 4);z-index:10;will-change:transform;transition:transform var(--animation-speed) ease-in-out;border-radius:8px;justify-content:center;align-items:center;font-size:48px;font-weight:800;display:flex;position:absolute}.tile-ghost{z-index:5;opacity:0;transition:transform var(--animation-speed) ease-in-out, opacity var(--animation-speed) ease-in-out}.tile-inner{background:inherit;width:100%;height:100%;color:inherit;border-radius:8px;justify-content:center;align-items:center;display:flex;position:absolute;top:0;left:0}.tile-merged-value{z-index:2;opacity:0;animation:linear forwards merge-pop}@keyframes merge-pop{0%{opacity:0;transform:scale(1)}to{opacity:1;transform:scale(1)}}.tile-new .tile-inner{opacity:0;animation:.2s ease-in-out forwards appear}@keyframes appear{0%{opacity:0;transform:scale(0)}to{opacity:1;transform:scale(1)}}.tile-2{background:var(--tile-2-bg);color:var(--tile-2-color)}.tile-4{background:var(--tile-4-bg);color:var(--tile-4-color)}.tile-8{background:var(--tile-8-bg);color:var(--tile-8-color)}.tile-16{background:var(--tile-16-bg);color:var(--tile-16-color)}.tile-32{background:var(--tile-32-bg);color:var(--tile-32-color)}.tile-64{background:var(--tile-64-bg);color:var(--tile-64-color)}.tile-128{background:var(--tile-128-bg);color:var(--tile-128-color)}.tile-256{background:var(--tile-256-bg);color:var(--tile-256-color)}.tile-512{background:var(--tile-512-bg);color:var(--tile-512-color)}.tile-1024{background:var(--tile-1024-bg);color:var(--tile-1024-color)}.tile-2048{background:var(--tile-2048-bg);color:var(--tile-2048-color)}.tile-128 .tile-inner,.tile-256 .tile-inner,.tile-512 .tile-inner{font-size:40px}.tile-1024 .tile-inner,.tile-2048 .tile-inner{font-size:32px}.game-message{z-index:100;text-align:center;background:#eee4daba;border-radius:6px;flex-direction:column;justify-content:center;align-items:center;animation:.8s ease-in-out fade-in;display:flex;position:absolute;inset:0}@keyframes fade-in{0%{opacity:0}to{opacity:1}}.game-message p{color:#776e65;margin-bottom:20px;font-size:60px;font-weight:700}.instructions{color:#776e65;margin-top:20px;line-height:1.6}.instructions h3{text-transform:uppercase;margin-bottom:8px;font-size:18px}.instructions p{margin-bottom:16px;font-size:15px}.instructions strong{color:#8f7a66}.how-to-play,.zen-mode-info,.power-mode-info{border-top:2px solid #eee4da;padding-top:15px}@media screen and (max-width:520px){:root{--grid-gap:8px}.game-container{width:100vw;padding:10px}.title{font-size:50px}}