.level-select {
    text-align: center;
    margin-bottom: 20px;
}

button {
    padding: 8px 16px;
    margin: 5px;
    border: none;
    border-radius: 4px;
    background-color: #4CAF50;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #45a049;
}

button:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

.grid {
    display: grid;
    gap: 2px;
    width: fit-content;
    margin: 0 auto;
    background-color: #333;
    padding: 2px;
    border-radius: 4px;
}

.cell {
    width: 50px;
    height: 50px;
    background-color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5em;
    cursor: pointer;
    transition: background-color 0.3s;
}

.cell:hover {
    background-color: #e0e0e0;
}

.cell.fixed {
    background-color: #f0f0f0;
    cursor: not-allowed;
}

.cell.incorrect {
    background-color: #ffebee;
}

.cell.hint {
    background-color: #e8f5e9;
}

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

.status {
    text-align: center;
    margin-top: 10px;
    font-weight: bold;
}

.number-select {
    display: flex;
    justify-content: center;
    gap: 5px;
    margin: 10px 0;
}