.portada-libro-wrapper {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    perspective: 1000px;
    z-index: 1;
}

.portada-libro-cover {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    transform-origin: left center;
    transform-style: preserve-3d;
    backface-visibility: hidden;
}

.portada-libro-cover:hover {
    cursor: pointer;
}

/* Efecto de página */
.portada-libro-cover::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 10%);
    pointer-events: none;
}

/* Efecto de sombra en la página */
.portada-libro-cover::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(90deg, rgba(0,0,0,0.1), rgba(0,0,0,0.2));
    opacity: 0.7;
    pointer-events: none;
}

/* Animación para la rotación automática */
@keyframes portada-hover {
    0% { transform: rotateY(0deg); }
    45% { transform: rotateY(-120deg); }
    55% { transform: rotateY(-120deg); }
    100% { transform: rotateY(0deg); }
}

.portada-libro-text {
    text-align: center;
    transition: opacity 0.3s ease;
}