body {
    background-color: #f8f9fa;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

footer {
    position: fixed;
    width: 100%;
    bottom: 0;
}

header img {
    width: 300px;
}

header {
    background-color: #011936;
    color: white;
    padding: 20px 0;
    text-align: center;
    margin-bottom: 30px;
}

.row>* {
    margin-top:0 !important;
}

.bingo-card {
    max-width: 900px;
    margin: auto;
}

.bingo-cell {
    border: 1px solid #dee2e6;
    background-color: #ffffff;
    padding: 10px;
    text-align: center;
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s;
    height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
    word-wrap: break-word;
}

.bingo-cell.marked {
    background-color: #28a745;
    color: white;
}

.free-space {
    background-color: #ffc107;
    color: white;
    cursor: default;
}

.btn-primary {
    background-color: #0d6efd;
    border: none;
}

.btn-primary:hover {
    background-color: #0b5ed7;
}

.category-selector {
    max-width: 600px;
    margin: 0 auto 20px;
}

@media (max-width: 576px) {
    .bingo-cell {
        padding: 5px;
        height: 80px;
        font-size: 14px;
    }
}