/* ============================================================
   CATALOGO.CSS — BibioTec
   Carrusel accesible + Grid de tarjetas de libros
   ============================================================ */

/* ── Utilidad: sólo para lectores de pantalla ── */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ══════════════════════════════════════════════
   HERO del catálogo
══════════════════════════════════════════════ */
.catalog-hero {
    position: relative;
    background: linear-gradient(135deg, #064e3b 0%, #065f46 60%, #047857 100%);
    color: #fff;
    padding: 5rem 1.5rem;
    text-align: center;
    overflow: hidden;
}

.catalog-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url('https://images.unsplash.com/photo-1481627834876-b7833e8f5570?q=80&w=1600&auto=format&fit=crop')
        center / cover no-repeat;
    opacity: .1;
    pointer-events: none;
}

.catalog-hero-inner {
    position: relative;
    z-index: 1;
    max-width: 750px;
    margin: 0 auto;
}

.catalog-hero h1 {
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 1.25rem;
    color: #fff;
}

.catalog-hero h1 span {
    color: #fcd34d;
}

/* ══════════════════════════════════════════════
   SECCIÓN BASE
══════════════════════════════════════════════ */
.catalog-section {
    padding: 4rem 0;
}

.catalog-section + .catalog-section {
    border-top: 1px solid #f3f4f6;
}

/* ══════════════════════════════════════════════
   CARRUSEL — Más populares
══════════════════════════════════════════════ */

/* Controles superiores */
.carousel-controls {
    display: flex;
    align-items: center;
    gap: .6rem;
    margin-top: 2rem;
    margin-bottom: 1.25rem;
}

.carousel-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .4rem;
    background: #fff;
    border: 2px solid #e5e7eb;
    border-radius: .5rem;
    padding: .5rem .85rem;
    cursor: pointer;
    color: #374151;
    font-size: .85rem;
    font-weight: 600;
    transition: background .15s, border-color .15s, color .15s;
    min-width: 2.5rem;
    min-height: 2.5rem;
}

.carousel-btn:hover {
    background: #f0fdf4;
    border-color: #064e3b;
    color: #064e3b;
}

.carousel-btn:focus-visible {
    outline: 3px solid #c2410c;
    outline-offset: 2px;
}

/* Botón pausa/play: aspecto destacado */
.carousel-btn--pause {
    background: #064e3b;
    border-color: #064e3b;
    color: #fff;
    padding: .5rem 1.1rem;
}

.carousel-btn--pause:hover {
    background: #065f46;
    border-color: #065f46;
    color: #fff;
}

/* Cuando está pausado (aria-pressed="true") */
.carousel-btn--pause[aria-pressed="true"] {
    background: #c2410c;
    border-color: #c2410c;
    color: #fff;
}

.carousel-btn-label {
    /* visible en desktop; oculto en muy pequeño si se quiere */
}

@media (prefers-reduced-motion: reduce) {
    .carousel-btn {
        transition: none;
    }
}

/* Región deslizante */
.carousel-wrapper {
    overflow: hidden;
    border-radius: 1rem;
}

.carousel-track {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    /* El JS mueve esto con transform */
    transition: transform .45s cubic-bezier(.4, 0, .2, 1);
}

@media (prefers-reduced-motion: reduce) {
    .carousel-track {
        transition: none;
    }
}

/* Cada slide ocupa 100% del wrapper */
.carousel-slide {
    flex: 0 0 100%;
    min-width: 0;
}

/* Tarjeta interior del carrusel */
.carousel-card {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 2.5rem;
    align-items: center;
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 1rem;
    padding: 2.5rem;
    box-shadow: 0 4px 20px rgba(6, 78, 59, .07);
}

@media (max-width: 640px) {
    .carousel-card {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .carousel-img-wrap {
        display: flex;
        justify-content: center;
    }
}

.carousel-img-wrap {
    position: relative;
    display: inline-block;
}

.carousel-img {
    display: block;
    width: 100%;
    max-width: 200px;
    height: auto;
    border-radius: .75rem;
    object-fit: cover;
    box-shadow: 0 10px 30px rgba(0, 0, 0, .15);
    /* Placeholder verde mientras carga */
    background: #d1fae5;
    aspect-ratio: 2 / 3;
}

.carousel-badge {
    position: absolute;
    top: .6rem;
    left: .6rem;
    background: #064e3b;
    color: #fff;
    font-size: .7rem;
    font-weight: 800;
    letter-spacing: .05em;
    padding: .2rem .6rem;
    border-radius: 2rem;
    text-transform: uppercase;
}

.carousel-genre {
    font-size: .75rem;
    font-weight: 700;
    color: #c2410c;
    text-transform: uppercase;
    letter-spacing: .08em;
    margin-bottom: .5rem;
}

.carousel-title {
    font-size: clamp(1.4rem, 2.5vw, 2rem);
    font-weight: 800;
    color: #111827;
    line-height: 1.2;
    margin-bottom: .4rem;
}

.carousel-author {
    font-size: 1rem;
    color: #6b7280;
    font-style: italic;
    margin-bottom: .9rem;
}

.carousel-desc {
    font-size: .95rem;
    color: #4b5563;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.carousel-cta {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    background: #064e3b;
    color: #fff;
    padding: .65rem 1.4rem;
    border-radius: .5rem;
    font-size: .9rem;
    font-weight: 700;
    text-decoration: none;
    transition: background .15s;
}

.carousel-cta:hover {
    background: #065f46;
}

.carousel-cta:focus-visible {
    outline: 3px solid #c2410c;
    outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
    .carousel-cta {
        transition: none;
    }
}

/* Puntos indicadores */
.carousel-dots {
    display: flex;
    justify-content: center;
    gap: .6rem;
    margin-top: 1.25rem;
}

.carousel-dot {
    width: .75rem;
    height: .75rem;
    border-radius: 50%;
    background: #d1fae5;
    border: 2px solid #6ee7b7;
    cursor: pointer;
    padding: 0;
    transition: background .2s, transform .2s;
}

.carousel-dot:hover {
    background: #6ee7b7;
}

.carousel-dot.is-active {
    background: #064e3b;
    border-color: #064e3b;
    transform: scale(1.3);
}

.carousel-dot:focus-visible {
    outline: 3px solid #c2410c;
    outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
    .carousel-dot {
        transition: none;
    }

    .carousel-dot.is-active {
        transform: none;
    }
}

/* ══════════════════════════════════════════════
   FILTROS
══════════════════════════════════════════════ */
.catalog-filters {
    display: flex;
    flex-wrap: wrap;
    gap: .6rem;
    margin-top: 1.75rem;
    margin-bottom: 2rem;
}

.filter-btn {
    padding: .45rem 1.1rem;
    border-radius: 2rem;
    border: 2px solid #e5e7eb;
    background: #fff;
    color: #374151;
    font-size: .875rem;
    font-weight: 600;
    cursor: pointer;
    transition: background .15s, border-color .15s, color .15s;
}

.filter-btn:hover {
    border-color: #064e3b;
    color: #064e3b;
    background: #f0fdf4;
}

.filter-btn.is-active,
.filter-btn[aria-pressed="true"] {
    background: #064e3b;
    border-color: #064e3b;
    color: #fff;
}

.filter-btn:focus-visible {
    outline: 3px solid #c2410c;
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    .filter-btn {
        transition: none;
    }
}

/* ══════════════════════════════════════════════
   GRID DE TARJETAS
══════════════════════════════════════════════ */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

/* Ocultar tarjeta al filtrar */
.books-grid li[hidden] {
    display: none;
}

.book-card {
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, .04);
    transition: box-shadow .2s ease, transform .2s ease;
    display: flex;
    flex-direction: column;
}

.book-card:hover {
    box-shadow: 0 10px 30px rgba(6, 78, 59, .1);
    transform: translateY(-4px);
}

@media (prefers-reduced-motion: reduce) {
    .book-card:hover {
        transform: none;
    }
}

.book-img-wrap {
    background: #f0fdf4;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem 1rem;
}

.book-img {
    display: block;
    width: 120px;
    height: auto;
    border-radius: .5rem;
    object-fit: cover;
    box-shadow: 0 4px 16px rgba(0, 0, 0, .12);
    /* Placeholder mientras carga */
    background: #d1fae5;
    aspect-ratio: 2 / 3;
}

.book-info {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: .2rem;
    flex: 1;
}

.book-genre-tag {
    display: inline-block;
    font-size: .7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .07em;
    color: #c2410c;
    background: #ffedd5;
    border-radius: 2rem;
    padding: .15rem .65rem;
    margin-bottom: .3rem;
    align-self: flex-start;
}

.book-title {
    font-size: 1rem;
    font-weight: 700;
    color: #111827;
    line-height: 1.3;
    margin-bottom: .15rem;
}

.book-author {
    font-size: .85rem;
    color: #6b7280;
    font-style: italic;
}

.book-year {
    font-size: .8rem;
    color: #595959;
    margin-bottom: .75rem;
}

.book-link {
    display: inline-block;
    margin-top: auto;
    font-size: .85rem;
    font-weight: 700;
    color: #064e3b;
    text-decoration: underline;
    text-underline-offset: 3px;
    border-radius: .25rem;
}

.book-link:hover {
    color: #047857;
}

.book-link:focus-visible {
    outline: 3px solid #c2410c;
    outline-offset: 2px;
}

/* Sin resultados */
.no-results {
    text-align: center;
    color: #6b7280;
    font-size: 1rem;
    padding: 3rem 0;
}

/* ── Responsive ── */
@media (max-width: 480px) {
    .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    }
}