/* Inventory Slots */
#inventorySlots {
    display: flex;
    gap: 8px;
    flex-direction: column;
}

.inventory-slot {
    width: 50px;
    height: 50px;
    background: radial-gradient(ellipse at center, #1a237e 0%, #0d47a1 50%, #01579b 100%);
    border: 2px solid #1565c0;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: all 0.3s ease;
    box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.1);
}

.inventory-slot.filled {
    border-color: #42a5f5;
    box-shadow: 
        inset 0 2px 4px rgba(255, 255, 255, 0.2),
        0 0 12px rgba(66, 165, 245, 0.4);
}

.inventory-slot.active {
    border-color: #FFD700;
    box-shadow: 
        inset 0 2px 4px rgba(255, 255, 255, 0.2),
        0 0 15px rgba(255, 215, 0, 0.6);
    transform: scale(1.05);
}

.inventory-slot::before {
    content: attr(data-key);
    position: absolute;
    top: -8px;
    right: -8px;
    background: #333;
    color: white;
    border-radius: 50%;
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    font-weight: bold;
    border: 1px solid #555;
}

.inventory-slot.empty::after {
    content: '';
    width: 20px;
    height: 20px;
    border: 2px dashed #555;
    border-radius: 4px;
}