/* NUMBER SLIDER CSS */
.puzzle-container {
    display: inline-block;
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 10px;
    backdrop-filter: blur(10px);
}

.puzzle-grid {
    display: grid;
    grid-template-columns: repeat(3, 107px);
    grid-template-rows: repeat(3, 107px);
    gap: 5px;
    background: rgba(0, 0, 0, 0.3);
    padding: 5px;
    border-radius: 5px;
}

.tile {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: bold;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    user-select: none;
}

.tile:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(102, 126, 234, 0.5);
}

.tile.empty {
    background: transparent;
    border: 2px dashed rgba(255, 255, 255, 0.2);
    cursor: default;
}

.tile.empty:hover {
    transform: none;
    box-shadow: none;
}

.controls {
    margin-top: 20px;
    text-align: center;
}

.btn {
    padding: 10px 20px;
    font-size: 16px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin: 0 5px;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.stats {
    margin-top: 15px;
    color: white;
    font-size: 18px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
}

.win-message {
    margin-top: 15px;
    color: #4ade80;
    font-size: 24px;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    display: none;
}

.win-message.show {
    display: block;
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}