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alternate}.chess-square.legal-move{position:relative}.chess-square.legal-move:before{content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:20px;height:20px;border-radius:50%;background:#22c55ecc;animation:moveIndicator 2s ease-in-out infinite}.chess-square.legal-move.has-piece:before{width:100%;height:100%;border-radius:0;background:#ef44444d;border:3px solid #ef4444}.chess-square.last-move{background:linear-gradient(45deg,rgba(251,191,36,.3) 25%,transparent 25%,transparent 75%,rgba(251,191,36,.3) 75%);animation:lastMoveGlow 3s ease-in-out}@keyframes pulse{0%{box-shadow:0 0 #3b82f666}to{box-shadow:0 0 20px 10px #3b82f61a}}@keyframes moveIndicator{0%,to{opacity:.6;transform:translate(-50%,-50%) scale(1)}50%{opacity:1;transform:translate(-50%,-50%) scale(1.2)}}@keyframes lastMoveGlow{0%{box-shadow:inset 0 0 20px #fbbf2480}50%{box-shadow:inset 0 0 30px #fbbf244d}to{box-shadow:inset 0 0 10px #fbbf2433}}@keyframes pieceMove{0%{transform:scale(1)}50%{transform:scale(1.1)}to{transform:scale(1)}}.chess-piece.moving{animation:pieceMove .3s ease-in-out}.debug-actions{margin-top:1rem;padding-top:1rem;border-top:1px solid rgba(148,163,184,.2)}.debug-btn{width:100%;padding:.75rem;font-size:.9rem;border-radius:8px;cursor:pointer;transition:all .3s ease;display:flex;align-items:center;justify-content:center;gap:.5rem}