/* =============================================================================
   Visor flipbook de catálogos (PDF.js + StPageFlip)
   ============================================================================= */

/* En la página del visor ocultamos el chrome del sitio y vamos a pantalla completa */
body.page-flipbook { padding-top: 0 !important; background: #17171c; overflow: hidden; }
body.page-flipbook .site-header,
body.page-flipbook .site-footer,
body.page-flipbook #cookie-banner,
body.page-flipbook .alert { display: none !important; }

.flipbook-viewer {
    position: fixed;
    inset: 0;
    z-index: 500;
    display: flex;
    flex-direction: column;
    background: #17171c;
    color: #fff;
    -webkit-font-smoothing: antialiased;
}

/* --- Barra superior --- */
.fb-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 20px;
    background: rgba(0, 0, 0, .35);
    border-bottom: 1px solid rgba(255, 255, 255, .08);
    flex-shrink: 0;
}
.fb-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: #fff;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: .92rem;
}
.fb-back:hover { color: var(--color-primary); }
.fb-title {
    color: rgba(255, 255, 255, .85);
    font-family: var(--font-display);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .06em;
    font-size: .92rem;
    text-align: center;
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.fb-actions { display: flex; gap: 10px; align-items: center; flex-shrink: 0; }
.fb-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: #fff;
    font-size: .82rem;
    padding: 8px 14px;
    border-radius: var(--radius-pill);
    background: rgba(255, 255, 255, .1);
    border: 1px solid rgba(255, 255, 255, .18);
    transition: background var(--t-fast) var(--ease);
}
.fb-btn:hover { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }

/* --- Escenario del libro --- */
.fb-stage {
    flex: 1;
    min-height: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 20px 12px;
    position: relative;
}
.fb-book { max-width: 100%; max-height: 100%; }
/* Sombra bajo el libro para dar profundidad */
.fb-book .stf__parent { margin: 0 auto; }

.fb-nav {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(255, 255, 255, .1);
    border: 1px solid rgba(255, 255, 255, .18);
    color: #fff;
    font-size: 1.9rem;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background var(--t-fast) var(--ease);
}
.fb-nav:hover { background: var(--color-primary); border-color: var(--color-primary); }

.fb-loading {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: rgba(255, 255, 255, .75);
    font-family: var(--font-display);
    letter-spacing: .04em;
}
.fb-loading::before {
    content: '';
    width: 22px; height: 22px;
    border: 3px solid rgba(255, 255, 255, .25);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: fbSpin .8s linear infinite;
}
@keyframes fbSpin { to { transform: rotate(360deg); } }

.fb-pageinfo {
    position: absolute;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, .5);
    padding: 6px 16px;
    border-radius: var(--radius-pill);
    font-size: .85rem;
    color: #fff;
    pointer-events: none;
}

@media (max-width: 640px) {
    .fb-nav { display: none; }
    .fb-title { display: none; }
    .fb-topbar { padding: 10px 14px; }
    .fb-btn { padding: 7px 11px; font-size: .78rem; }
}
@media (prefers-reduced-motion: reduce) {
    .fb-loading::before { animation: none; }
}