.book-card-course .book-cover {
    height: auto;
    aspect-ratio: 4 / 3;
}

.book-card-course .book-cover img {
    width: 100%;
    height: auto;
    aspect-ratio: 4 / 3;
    object-fit: contain;
}

.course-detail .detail-cover {
    width: 100%;
    max-width: 100%;
    height: auto;
    aspect-ratio: 4 / 3;
}

.course-detail .detail-cover img {
    width: 100%;
    height: auto;
    aspect-ratio: 4 / 3;
    object-fit: contain;
}

.course-gallery {
    grid-column: 1 / -1;
    min-width: 0;
}

.course-gallery a {
    display: block;
    margin-top: 16px;
}

.course-gallery img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 8px;
}

.quick-add-btn:disabled,
.btn-add-detail:disabled {
    opacity: .6;
    cursor: not-allowed;
}