#gameBoard{display:grid;gap:8px;max-width:440px;margin:0 auto;padding:20px;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border-radius:15px;box-shadow:0 8px 32px #0003;aspect-ratio:1}.number-cell{display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#fff 0%,#f8f9fa 100%);border:2px solid #e9ecef;border-radius:12px;font-size:2rem;font-weight:700;color:#495057;cursor:pointer;transition:all .2s ease;user-select:none;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;touch-action:manipulation;position:relative;min-height:60px;min-width:60px;box-shadow:0 2px 8px #0000001a}.number-cell:hover{background:linear-gradient(135deg,#e3f2fd 0%,#bbdefb 100%);border-color:#2196f3;transform:translateY(-2px);box-shadow:0 4px 16px #2196f34d}.number-cell:active{transform:translateY(0);box-shadow:0 2px 8px #0003}.number-cell.completed{background:linear-gradient(135deg,#c8e6c9 0%,#a5d6a7 100%);border-color:#4caf50;color:#2e7d32;transform:scale(0.95);box-shadow:0 2px 8px #4caf504d}.number-cell.error{background:linear-gradient(135deg,#ffcdd2 0%,#ef9a9a 100%);border-color:#f44336;color:#c62828;box-shadow:0 2px 8px #f443364d}.progress{height:8px;background-color:#e9ecef;border-radius:4px;overflow:hidden;margin-bottom:15px}.progress-bar{background:linear-gradient(90deg,#667eea 0%,#764ba2 100%);transition:width .3s ease}.game-info{display:flex;justify-content:space-between;align-items:center;margin-bottom:15px;padding:10px;background:#667eea1a;border-radius:8px}.game-info .info-item{text-align:center;flex:1}.game-info .info-label{font-size:.85rem;color:#6c757d;margin-bottom:2px}.game-info .info-value{font-size:1.1rem;font-weight:700;color:#495057}.countdown-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#000c;display:flex;align-items:center;justify-content:center;z-index:1000}.countdown-number{font-size:4rem;font-weight:700;color:#fff;text-shadow:0 0 20px #ffffff80;animation:countdown-pulse 1s ease-in-out infinite}@keyframes countdown-pulse{0%{transform:scale(1);opacity:1}50%{transform:scale(1.2);opacity:.8}100%{transform:scale(1);opacity:1}}@keyframes pulse{0%{transform:scale(1)}50%{transform:scale(1.1)}100%{transform:scale(0.95)}}@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}.difficulty-easy #gameBoard{grid-template-columns:repeat(4,1fr);grid-template-rows:repeat(4,1fr)}.difficulty-normal #gameBoard{grid-template-columns:repeat(5,1fr);grid-template-rows:repeat(5,1fr)}.difficulty-hard #gameBoard{grid-template-columns:repeat(6,1fr);grid-template-rows:repeat(6,1fr)}.difficulty-easy .number-cell{font-size:2rem}.difficulty-normal .number-cell{font-size:1.9rem}.difficulty-hard .number-cell{font-size:1.8rem}.btn-game{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border:none;color:#fff;padding:10px 20px;border-radius:8px;font-weight:700;transition:all .3s ease;box-shadow:0 4px 15px #667eea4d}.btn-game:hover{background:linear-gradient(135deg,#5a6fd8 0%,#6a4190 100%);transform:translateY(-2px);box-shadow:0 6px 20px #667eea66;color:#fff}.btn-game:active{transform:translateY(0);box-shadow:0 4px 15px #667eea4d}.modal-header{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff;border-bottom:none}.modal-header .btn-close{filter:invert(1)}.modal-body{padding:2rem}.modal-footer{border-top:none;padding:1rem 2rem 2rem}.difficulty-card{cursor:pointer;transition:all .2s ease;border:2px solid #dee2e6}.difficulty-card:hover{border-color:#667eea;transform:translateY(-2px);box-shadow:0 4px 12px #667eea26}.difficulty-card.border-primary{border-color:#667eea!important;box-shadow:0 0 15px #667eea4d}.difficulty-card.bg-light{background-color:#667eea0d!important}.stats-card{background:linear-gradient(135deg,#f8f9fa 0%,#e9ecef 100%);border:1px solid #dee2e6;border-radius:10px;padding:15px;margin-bottom:15px}.stats-title{color:#495057;font-size:1.1rem;font-weight:700;margin-bottom:10px}.stats-value{font-size:1.5rem;font-weight:700;color:#667eea}@media (max-width: 768px){#gameBoard{max-width:90vw;max-height:90vw;padding:15px;gap:6px}.number-cell{min-height:50px;min-width:50px}.countdown-number{font-size:3rem}.game-info{flex-direction:column;gap:10px}.game-info .info-item{display:flex;justify-content:space-between;align-items:center;width:100%}}@media (max-width: 480px){#gameBoard{max-width:95vw;max-height:95vw;padding:10px;gap:4px}.number-cell{min-height:40px;min-width:40px}.countdown-number{font-size:2.5rem}}@media (hover: none) and (pointer: coarse){.number-cell:hover{background:linear-gradient(135deg,#fff 0%,#f8f9fa 100%);border-color:#e9ecef;transform:none;box-shadow:0 2px 8px #0000001a}.number-cell:active{background:linear-gradient(135deg,#e3f2fd 0%,#bbdefb 100%);border-color:#2196f3;transform:scale(0.95);box-shadow:0 4px 16px #2196f34d}}.number-cell:focus{outline:3px solid #667eea;outline-offset:2px}@media (prefers-contrast: high){.number-cell{border-width:3px;border-color:#000}.number-cell.completed{background:#0f0;border-color:#000;color:#000}.number-cell.error{background:red;border-color:#000;color:#fff}}@media (prefers-reduced-motion: reduce){*{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}.number-cell{transition:none}.number-cell:hover{transform:none}.number-cell:active{transform:none}}