: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:560px;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{flex-wrap:wrap;justify-content:space-between;align-items:stretch;gap:12px;display:flex}.controls-below{margin-top:-4px}.mode-controls{flex:240px;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;display:grid}.action-buttons{flex:2 360px;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;display:grid}.action-groups{flex-direction:column;flex:2 360px;gap:8px;display:flex}.action-row{gap:8px;display:grid}.action-row-replay-mode,.action-row-replay-files,.action-row-primary{grid-template-columns:repeat(2,minmax(0,1fr))}.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)}.new-game-btn:disabled{color:#8a7f74;opacity:1;cursor:not-allowed;box-shadow:none;background:#c8beb2;transform:none}.new-game-btn:disabled:hover,.new-game-btn:disabled:active{background:#c8beb2;transform:none}.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}.replay-panel{background:#eee4da99;border:1px solid #bbada0b3;border-radius:12px;flex-direction:column;gap:10px;margin-bottom:-4px;padding:12px;animation:.3s ease-out fadeIn;display:flex}.replay-banner-main{justify-content:center;align-items:center;gap:14px;display:flex}.replay-banner-text{flex-direction:column;align-items:flex-start;gap:2px;display:flex}.replay-arrow{color:#f2b179;filter:drop-shadow(0 2px 4px #0000001f);flex:none;width:56px;height:56px}.replay-controls{flex-wrap:wrap;justify-content:center;align-items:center;gap:6px;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,12px) * 3) / 4);height:calc((100% - var(--grid-gap,12px) * 3) / 4);z-index:10;will-change:transform;transition:transform var(--animation-speed,.15s) ease-in-out;backface-visibility:hidden;border-radius:8px;justify-content:center;align-items:center;font-size:42px;font-weight:800;display:flex;position:absolute}.tile-inner{color:#776e65;background:#eee4da;border-radius:8px;justify-content:center;align-items:center;width:100%;height:100%;display:flex;overflow:hidden}.tile-power-value{letter-spacing:-.02em;align-items:flex-start;gap:0;font-size:.9em;line-height:1;display:inline-flex}.tile-power-value sup{margin-top:-.22em;font-size:.8em;line-height:1;top:0}.tile-new .tile-inner{animation:.2s ease-out appear}@-webkit-keyframes appear{0%{opacity:.5;-webkit-transform:scale(.5)}to{opacity:1;-webkit-transform:scale(1)}}@keyframes appear{0%{opacity:.5;transform:scale(.5)}to{opacity:1;transform:scale(1)}}.tile-2 .tile-inner{color:#776e65;background:#eee4da}.tile-4 .tile-inner{color:#776e65;background:#ede0c8}.tile-8 .tile-inner{color:#f9f6f2;background:#f2b179}.tile-16 .tile-inner{color:#f9f6f2;background:#f59563}.tile-32 .tile-inner{color:#f9f6f2;background:#f67c5f}.tile-64 .tile-inner{color:#f9f6f2;background:#f65e3b}.tile-128 .tile-inner{color:#f9f6f2;background:#edcf72}.tile-256 .tile-inner{color:#f9f6f2;background:#edcc61}.tile-512 .tile-inner{color:#f9f6f2;background:#edc850}.tile-1024 .tile-inner{color:#f9f6f2;background:#edc53f}.tile-2048 .tile-inner{color:#f9f6f2;background:#edc22e}.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:40px;font-weight:700}@media screen and (max-width:520px){:root{--grid-gap:8px}.tile{font-size:38px}.controls{flex-direction:column}.mode-controls,.action-groups{grid-template-columns:1fr}.new-game-btn,.mode-btn{width:100%}}.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}.action-row-replay-mode,.action-row-replay-files,.action-row-primary{grid-template-columns:1fr}}