#bingo-container {
    font-family: Arial, sans-serif;
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}

.bingo-card {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-top: 20px;
}

.bingo-cell {
    aspect-ratio: 1;
    background-color: #ffffff;
    border: 2px solid #333;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s;
    padding: 5px;
    word-wrap: break-word;
    text-align: center;
    hyphens: auto;
}

.bingo-cell.selected {
    background-color: #4CAF50;
    color: white;
}

.popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
}

.popup-content {
    background-color: white;
    padding: 20px;
    border-radius: 5px;
    text-align: center;
}

button {
    margin-top: 10px;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
}

@media (max-width: 480px) {
    .bingo-cell {
        font-size: 14px;
        padding: 3px;
    }
}