@keyframes shake-piece{0%{transform:translate(0)}20%{transform:translate(-5px)}40%{transform:translate(5px)}60%{transform:translate(-4px)}80%{transform:translate(4px)}to{transform:translate(0)}}.shake-error{transform-origin:50%;animation:.3s ease-in-out shake-piece}@keyframes shake-check{0%{transform:translate(0)}20%{transform:translate(-4px)}40%{transform:translate(4px)}60%{transform:translate(-3px)}80%{transform:translate(3px)}to{transform:translate(0)}}.in-check-warning{transform-origin:50%;animation:.4s ease-in-out infinite shake-check}.chess-piece{will-change:transform;transition:transform .15s cubic-bezier(.25,.46,.45,.94)}@keyframes slide-up{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.result-sheet{animation:.28s cubic-bezier(.34,1.05,.64,1) forwards slide-up}@keyframes pop-in{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}.confirm-popup{animation:.2s cubic-bezier(.34,1.1,.64,1) forwards pop-in}@keyframes highlight-fade{0%{opacity:.5}to{opacity:.25}}.last-move-highlight{animation:.3s ease-out forwards highlight-fade}svg{touch-action:none;-webkit-tap-highlight-color:transparent}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:#ccc;border-radius:2px}@keyframes piece-enter{0%{opacity:0}to{opacity:1}}@keyframes piece-select{0%{opacity:1}40%{opacity:.6}to{opacity:1}}.piece-select-pulse{animation:.15s ease-out forwards piece-select}@media (prefers-reduced-motion:reduce){.piece-enter,.piece-select-pulse{animation:none}}@keyframes piece-flip{0%{transform:rotateY(0)scaleX(1)}50%{transform:rotateY(90deg)scaleX(.1)}to{transform:rotateY(0)scaleX(1)}}.piece-flip{transform-origin:50%;transform-box:fill-box;animation:.2s ease-in-out forwards piece-flip}.piece-enter{animation:.18s ease-out forwards piece-enter}@keyframes piece-capture{0%{opacity:1;transform:scale(1)}to{opacity:0;transform:scale(.5)}}.piece-capture{transform-origin:50%;transform-box:fill-box;animation:.2s ease-out forwards piece-capture}@keyframes valid-move-pulse{0%,to{opacity:.45;r:14}50%{opacity:.7;r:16}}@media (prefers-reduced-motion:reduce){.piece-flip,.piece-enter,.piece-capture{animation:none}}@keyframes timer-game-start{0%{transform:scale(1);box-shadow:0 0 #4caf50e6}40%{transform:scale(1.1);box-shadow:0 0 0 14px #4caf5000}to{transform:scale(1);box-shadow:0 0 #4caf5000}}.timer-game-start{animation:.7s ease-out forwards timer-game-start}@media (width<=600px){.side-panel{display:none!important}.control-bar{flex-wrap:wrap!important;gap:4px!important}.control-bar button{padding:8px 0!important;font-size:.75rem!important}.timer-badge{min-width:50px!important;padding:3px 8px!important;font-size:.8rem!important}}.timer-badge--active{transform:scale(1.08);box-shadow:0 0 0 3px #4caf5073}.timer-badge--inactive{opacity:.62;transform:scale(1)}.clock-tick-dot{vertical-align:middle;background:currentColor;border-radius:50%;width:7px;height:7px;margin-right:5px;animation:1s ease-in-out infinite clock-pulse;display:inline-block}@keyframes clock-pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.3;transform:scale(.7)}}