/* Styles the in-site documentation book lists as category shelves. */
/* Markup is produced by resources/javascript/books.js. */

.pdf-books {
    --cat-fallback: #0a6eb4;
}

/* Previous Versions: a prominent selector picks one version; its shelves show below */
.pdf-books .version-controls {
    display: flex;
    align-items: baseline;
    gap: 0.7rem;
    margin-bottom: 1.8rem;
    padding-bottom: 0.9rem;
    border-bottom: 2px solid #16242f;
}

.pdf-books .version-label {
    font-size: 1.25rem;
    font-weight: 700;
}

.pdf-books .version-select {
    font-size: 1.15rem;
    font-weight: 700;
    padding: 0.2rem 0.5rem;
    border: 2px solid var(--cat-fallback);
    border-radius: 5px;
    background: #fff;
    color: var(--cat-fallback);
    cursor: pointer;
}

.pdf-books .shelf-section {
    margin-bottom: 2.4rem;
}

.pdf-books .shelf-head {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    margin-bottom: 1.1rem;
}

.pdf-books .shelf-head h2 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 700;
}

.pdf-books .cat-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--cat, var(--cat-fallback));
    flex: none;
}

.pdf-books .cat-count {
    font-size: 0.8rem;
    color: #5d6e7b;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

.pdf-books .shelf-row {
    display: flex;
    gap: 1.8rem;
    flex-wrap: wrap;
    align-items: flex-start;
    padding: 0 0 1.4rem;
    border-bottom: 3px solid var(--cat, var(--cat-fallback));
}

.pdf-books .spine {
    width: 200px;
    text-decoration: none;
    color: inherit;
    transition: transform 0.16s ease;
}

.pdf-books .spine:hover {
    transform: translateY(-5px);
}

.pdf-books .spine:focus-visible {
    outline: 2px solid var(--cat, var(--cat-fallback));
    outline-offset: 3px;
}

.pdf-books .spine-cover img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 1px 3px 3px 1px;
    box-shadow: -2px 3px 0 rgba(16, 36, 47, .10), 0 7px 16px rgba(16, 36, 47, .22);
}

.pdf-books .spine-cap {
    margin-top: 0.7rem;
}

.pdf-books .spine-cap h3 {
    margin: 0;
    font-size: 0.85rem;
    font-weight: 600;
    line-height: 1.25;
}

.pdf-books .spine-cap span {
    font-size: 0.74rem;
    color: #5d6e7b;
    font-variant-numeric: tabular-nums;
}

@media (prefers-reduced-motion: reduce) {
    .pdf-books .spine {
        transition: none;
    }
}