body {
    background: url("../img/background-Uoc4oPN.png") center center no-repeat #000;
    background-size: cover;
    min-height: 100vh;
}

/* Export answers form - challenge cards */
.challenge-card {
    transition: all 0.2s ease;
    cursor: pointer;
    border-radius: 6px;
}

.challenge-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    border-color: #0d6efd;
}

.challenge-card input[type="checkbox"]:checked ~ .card {
    border-color: #0d6efd;
    background-color: #e7f3ff;
}

.challenge-card .card-body {
    padding: 1.25rem;
}

.challenge-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: #212529;
}

.challenge-dates {
    font-size: 0.9rem;
    color: #6c757d;
    margin-bottom: 0.5rem;
}

.evaluation-badge {
    font-size: 0.85rem;
}