/* Container Spacing Utility */
.book-gallery-container {
    padding-top: 1.5rem;
    padding-bottom: 1.5rem;
}

/* Responsive Grid Card for Book & CD Thumbnails */
.book-thumb-card {
    background-color: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    padding: 15px;
    height: 190px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
}

.book-thumb-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.25);
    background-color: rgba(255, 255, 255, 0.08);
}

/* Enforces rigid aspect ratios safely bypassing strict server CSP filters */
.book-thumb-card img {
    max-height: 150px;
    max-width: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    display: block;
    margin-left: auto;
    margin-right: auto;
}