/**
 * Flipbook thumbnails - Desktop only. Panel hidden by default; shown via button in toolbar.
 */
.flipbook-viewer-thumbs-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0 0.6rem;
    height: 2.25rem;
    border: 1px solid var(--fvb-border, #e2e6ea);
    border-radius: 8px;
    background: var(--fvb-surface, #fff);
    color: var(--fvb-text-muted, #5c636a);
    font-size: 0.875rem;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.flipbook-viewer-thumbs-btn:hover {
    border-color: var(--fvb-primary, #0d6efd);
    color: var(--fvb-primary, #0d6efd);
}

.flipbook-viewer-thumbs-btn-icon {
    display: block;
    line-height: 0;
}

.flipbook-viewer-thumbs-btn-icon svg {
    display: block;
    width: 18px;
    height: 18px;
    fill: currentColor;
}

.flipbook-viewer-thumbs-wrap {
    display: none;
    background: var(--fvb-bg, #f8f9fa);
    border-bottom: 1px solid var(--fvb-border, #e2e6ea);
    padding: 0.5rem 0.75rem;
    overflow: hidden;
}

.flipbook-viewer-core.flipbook-viewer-core--thumbs-open .flipbook-viewer-thumbs-wrap {
    display: block;
}

.flipbook-viewer-thumbs {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0.15rem 0;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
}

.flipbook-viewer-thumbs::-webkit-scrollbar {
    height: 6px;
}

.flipbook-viewer-thumbs::-webkit-scrollbar-thumb {
    background: var(--fvb-text-muted, #5c636a);
    border-radius: 3px;
}

.flipbook-viewer-thumb {
    flex-shrink: 0;
    display: block;
    width: 48px;
    height: 64px;
    padding: 0;
    border: 2px solid var(--fvb-border, #e2e6ea);
    border-radius: 6px;
    background: #fff;
    cursor: pointer;
    overflow: hidden;
    position: relative;
    transition: border-color 0.15s, box-shadow 0.15s;
    -webkit-tap-highlight-color: transparent;
}

.flipbook-viewer-thumb:hover {
    border-color: var(--fvb-primary, #0d6efd);
}

.flipbook-viewer-thumb.flipbook-viewer-thumb--active {
    border-color: var(--fvb-primary, #0d6efd);
    box-shadow: 0 0 0 2px rgba(13, 110, 253, 0.25);
}

.flipbook-viewer-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.flipbook-viewer-thumb-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #e9ecef;
    color: var(--fvb-text-muted, #5c636a);
    font-size: 0.7rem;
    font-weight: 600;
}

.flipbook-viewer-mode-full .flipbook-viewer-thumb {
    width: 52px;
    height: 70px;
}

.flipbook-viewer-mode-full .flipbook-viewer-thumbs-wrap {
    padding: 0.5rem 1rem;
}

.flipbook-viewer-mode-embedded .flipbook-viewer-thumbs-wrap {
    padding: 0.35rem 0.5rem;
}

.flipbook-viewer-mode-embedded .flipbook-viewer-thumb {
    width: 40px;
    height: 54px;
}

/* Solo desktop: en responsive no se muestra botón ni panel */
@media (max-width: 768px) {
    .flipbook-viewer-thumbs-btn,
    .flipbook-viewer-thumbs-wrap {
        display: none !important;
    }
    .flipbook-viewer-core.flipbook-viewer-core--thumbs-open .flipbook-viewer-thumbs-wrap {
        display: none !important;
    }
}