.matrix-cell {
    width: 50px;
    height: 50px;
    text-align: center;
}

.fade {
    transition: all 0.3s ease-in-out;
}

input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
.matrix-cell {
    width: 3rem;
    height: 3rem;
    background-color: #374151; /* bg-gray-700 */
    border: 1px solid #6b7280; /* border-gray-500 */
    color: white;
    border-radius: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 500;
    box-shadow: 0 0 4px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
}