/* PÁGINA DE DETALLE DE LIBRO */

.btn-volver {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

.btn-volver:hover {
  color: var(--color-primary);
}

.libro-detalle-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 60px;
  margin: 40px 0;
  align-items: start;
}

.libro-portada-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--color-bg-alt);
}

.libro-portada-frame img {
  width: 100%;
  display: block;
  transition: transform 0.5s ease;
}

.libro-portada-frame:hover img {
  transform: scale(1.03);
}

.libro-contenido {
  transition: opacity 0.3s ease;
}

.libro-titulo {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: 8px;
}

.libro-subtitulo {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 24px;
}

.libro-sinopsis h3,
.libro-detalles h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--color-primary);
  margin-bottom: 12px;
  margin-top: 24px;
}

.libro-sinopsis p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 12px;
}

.libro-firma {
  font-style: italic;
  color: var(--color-accent);
  margin-top: 16px;
}

.libro-detalles p {
  font-size: 0.92rem;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 6px;
}

.libro-detalles strong {
  color: var(--color-text);
}

/* SIDEBAR MULTIMEDIA */
.libro-sidebar {
  margin-top: 20px;
  padding: 32px;
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.libro-sidebar h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.sidebar-botones {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.sidebar-botones .btn {
  font-size: 0.8rem;
  padding: 10px 22px;
}

/* CONTENIDO MULTIMEDIA DINÁMICO */
.contenido-multimedia {
  margin-top: 20px;
}

.contenido-multimedia h3 {
  font-family: var(--font-heading);
  color: var(--color-primary);
  margin-bottom: 16px;
}

.grid-videos {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.video-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.video-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.video-card a {
  text-decoration: none;
  color: inherit;
  display: block;
}

.video-thumb {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  display: block;
}

.video-card-info {
  padding: 14px 16px;
}

.video-card-info h4 {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.4;
}

.video-card-info p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

.iframe-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 16px;
}

.iframe-wrapper iframe {
  width: 100%;
  height: 100%;
  border: none;
}

@media (max-width: 800px) {
  .libro-detalle-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .libro-portada-frame {
    max-width: 300px;
    margin: 0 auto;
  }
}