.tile{flex:1;border-radius:var(--border-radius-md);display:flex;align-items:center;justify-content:center;font-size:42px;font-weight:700;box-sizing:border-box;transition:all .15s cubic-bezier(.4,0,.2,1);box-shadow:var(--shadow-sm);border:2px solid transparent;background-clip:padding-box;position:relative;transform-origin:center center}.tile-empty{background:var(--bg-tile-empty);box-shadow:none;border-radius:var(--border-radius-md)}.tile-value{color:var(--text-tile-light);animation:popIn .2s ease-out;font-family:JetBrains Mono,SF Mono,Courier New,monospace;font-variant-numeric:tabular-nums;letter-spacing:-.02em;font-weight:600}@keyframes popIn{0%{transform:scale(.7);opacity:0}70%{transform:scale(1.15)}to{transform:scale(1);opacity:1}}.tile-2{background:var(--tile-2);animation:tileAppear .15s cubic-bezier(.34,1.56,.64,1);box-shadow:var(--shadow-sm)}@keyframes tileAppear{0%{transform:scale(0);opacity:0}to{transform:scale(1);opacity:1}}.tile-4{background:var(--tile-4);animation:tileAppear 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var(--transition-normal);color:var(--text-secondary)}.game-explanation ul{margin:10px 0 20px;padding-left:24px;list-style-type:none}.game-explanation li{margin:10px 0;font-size:15px;transition:color var(--transition-normal);color:var(--text-secondary);padding-left:12px;position:relative}.game-explanation li:before{content:"•";position:absolute;left:0;color:var(--tile-32);font-weight:700}.App-footer{text-align:center;margin-top:40px;padding:20px;width:100%;color:var(--text-secondary);background:var(--ui-panel-bg);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--ui-panel-border);border-radius:var(--border-radius-md);box-shadow:var(--shadow-sm);transition:all var(--transition-normal)}.App-footer:hover{box-shadow:var(--shadow-md)}.App-footer p{margin:8px 0;font-size:14px}.credits{font-size:13px}.credits a{color:var(--text-primary);text-decoration:none;border-bottom:1px solid transparent;transition:all var(--transition-fast);padding-bottom:2px}.credits a:hover{color:var(--tile-32);border-bottom-color:var(--tile-32)}body.fullscreen-mode .intro-section,body.fullscreen-mode .game-explanation,body.fullscreen-mode .faq-container,body.fullscreen-mode .App-footer{display:none}body.fullscreen-mode .App{justify-content:center;padding:20px;min-height:100vh}body.fullscreen-mode .heading{margin-bottom:15px}body.fullscreen-mode .title{font-size:60px}@media (max-width: 520px){.app-header-row{flex-direction:column;align-items:center;gap:var(--spacing-md)}.heading{margin-bottom:15px}.title{font-size:50px}.controls-row{gap:8px}.subtitle{font-size:16px}body.fullscreen-mode .title{font-size:40px}.description,.game-explanation{font-size:14px}.game-explanation h2{font-size:20px}.game-explanation h3{font-size:18px}.game-explanation p,.game-explanation li{font-size:14px}}:root{--bg-primary: #faf8ef;--bg-secondary: #f5f5f5;--bg-board: #bbada0;--bg-tile-empty: #cdc1b4;--font-mono: "JetBrains Mono", "SF Mono", "Courier New", monospace;--tile-2: #eee4da;--tile-4: #ede0c8;--tile-8: #f2b179;--tile-16: #f59563;--tile-32: #f67c5f;--tile-64: #f65e3b;--tile-128: #edcf72;--tile-256: #edcc61;--tile-512: #edc850;--tile-1024: #edc53f;--tile-2048: #edc22e;--ui-panel-bg: rgba(238, 228, 218, .4);--ui-panel-border: rgba(187, 173, 160, .2);--ui-button-bg: rgba(238, 228, 218, .5);--ui-button-hover: rgba(242, 177, 121, .2);--ui-button-active: rgba(245, 149, 99, .3);--text-primary: #776e65;--text-secondary: #8f7a66;--text-light: #f9f6f2;--text-dark: #776e65;--text-tile-light: #776e65;--text-tile-dark: #f9f6f2;--shadow-sm: 0 1px 3px rgba(119, 110, 101, .06);--shadow-md: 0 2px 6px rgba(119, 110, 101, .08);--shadow-lg: 0 4px 12px rgba(119, 110, 101, .1);--border-radius-sm: 6px;--border-radius-md: 8px;--border-radius-lg: 12px;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 12px;--spacing-lg: 16px;--spacing-xl: 24px;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .2s cubic-bezier(.4, 0, .2, 1);--transition-slow: .3s 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var(--transition-normal),box-shadow var(--transition-normal)}.no-transition *{transition:none!important}[data-theme=dark] .tile-2{box-shadow:0 0 12px #3a3a3a66,0 0 0 2px #3a3a3a80}[data-theme=dark] .tile-4{box-shadow:0 0 12px #4a4a4a66,0 0 0 2px #4a4a4a80}[data-theme=dark] .tile-8{box-shadow:0 0 16px #8b5a2b80,0 0 0 2px #8b5a2b99}[data-theme=dark] .tile-16{box-shadow:0 0 16px #a0522d80,0 0 0 2px #a0522d99}[data-theme=dark] .tile-32{box-shadow:0 0 18px #b8623f99,0 0 0 2px #b8623fb3}[data-theme=dark] .tile-64{box-shadow:0 0 18px #c8502d99,0 0 0 2px #c8502db3}[data-theme=dark] .tile-128{box-shadow:0 0 20px #b8982f99,0 0 0 2px #b8982fb3}[data-theme=dark] .tile-256{box-shadow:0 0 20px #b8942899,0 0 0 2px #b89428b3}[data-theme=dark] .tile-512{box-shadow:0 0 22px #b8902099,0 0 0 2px #b89020b3}[data-theme=dark] .tile-1024{box-shadow:0 0 22px #b88c18b3,0 0 0 2px #b88c18cc}[data-theme=dark] .tile-2048{box-shadow:0 0 24px #b88810b3,0 0 0 3px #b88810cc}[data-theme=dark] 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#root{overflow-y:auto;height:100%;-webkit-overflow-scrolling:touch;touch-action:pan-y}.board{touch-action:none;-webkit-user-select:none;user-select:none}