.book {
    width: var(--book-w);
    height: var(--book-h);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.book img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.bookshelf {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 20px;
    padding: 20px;
}

.book:hover img {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.25);
}

.book-title {
    margin-top: 8px;
    font-size: 0.9rem;
    color: #333;
}