.grid-container-book {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
  width: 100%;
  justify-items: center;
  align-items: center;

}

/* Responsive para móvil */
@media (max-width: 768px) {
  .grid-container-book {
    grid-template-columns: 1fr;
  }
}

.book {
  width: 421px;
  height: 298px;
  perspective: 1000px;
  cursor: pointer;
  box-shadow: 0 10px 20px rgba(0,0,0,0.15);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;

}

.book:hover {
  transform: scale(1.05);
  box-shadow: 0 15px 30px rgba(0,0,0,0.25);
}

.page {
  position: absolute;
  width: 100%;
  height: 100%;
  transform-origin: left center;
  backface-visibility: hidden;
  transition: transform 0.8s ease;
  z-index: 1;
}

.page img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid #ccc;
}

/* Orden z-index para que páginas superiores tapen las inferiores */
.page.cover { z-index: 28; }
.page:nth-child(2)  { z-index: 27; }
.page:nth-child(3)  { z-index: 26; }
.page:nth-child(4)  { z-index: 25; }
.page:nth-child(5)  { z-index: 24; }
.page:nth-child(6)  { z-index: 23; }
.page:nth-child(7)  { z-index: 22; }
.page:nth-child(8)  { z-index: 21; }
.page:nth-child(9)  { z-index: 20; }
.page:nth-child(10) { z-index: 19; }
.page:nth-child(11) { z-index: 18; }
.page:nth-child(12) { z-index: 17; }
.page:nth-child(13) { z-index: 16; }
.page:nth-child(14) { z-index: 15; }
.page:nth-child(15) { z-index: 14; }
.page:nth-child(16) { z-index: 13; }
.page:nth-child(17) { z-index: 12; }
.page:nth-child(18) { z-index: 11; }
.page:nth-child(19) { z-index: 10; }
.page:nth-child(20) { z-index: 9; }
.page:nth-child(21) { z-index: 8; }
.page:nth-child(22) { z-index: 7; }
.page:nth-child(23) { z-index: 6; }
.page:nth-child(24) { z-index: 5; }
.page:nth-child(25) { z-index: 4; }
.page:nth-child(26) { z-index: 3; }
.page:nth-child(27) { z-index: 2; }


/* Ajusta más si tienes más páginas */