/**
 * 3D Book & Manga Page Turn Physics
 * Hardware accelerated 3D transforms & realistic page lighting
 */

.book-3d-container {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 2400px;
  perspective-origin: 50% 50%;
  overflow: visible;
}

.is-zoomed #book-3d,
.is-zoomed .book-3d-container {
  perspective: none !important;
}

.book-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  transform-style: preserve-3d;
  transform-origin: center center;
  transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1);
  max-height: 85vh;
  will-change: transform;
}

/* Modo Doble Página (Spread Manga) */
.book-wrapper.double-spread {
  gap: 0;
  box-shadow: 
    0 30px 60px rgba(0, 0, 0, 0.8),
    0 0 100px rgba(0, 0, 0, 0.5);
  border-radius: 4px;
}

/* Modo Página Individual */
.book-wrapper.single-page {
  box-shadow: 
    0 25px 50px rgba(0, 0, 0, 0.85),
    0 0 80px rgba(245, 176, 65, 0.1);
  border-radius: 6px;
}

.book-page {
  position: relative;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  transform-style: preserve-3d;
  overflow: hidden;
}

.is-zoomed .book-page,
.is-zoomed .page-inner {
  overflow: visible !important;
}

.double-spread .page-left {
  border-top-left-radius: 6px;
  border-bottom-left-radius: 6px;
  transform-origin: right center;
  transform: rotateY(2deg);
}

.double-spread .page-right {
  border-top-right-radius: 6px;
  border-bottom-right-radius: 6px;
  transform-origin: left center;
  transform: rotateY(-2deg);
}

.is-zoomed .double-spread .page-left,
.is-zoomed .double-spread .page-right {
  transform: none !important;
}

.single-page .book-page {
  border-radius: 6px;
}

.page-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #000;
  max-height: 84vh;
  overflow: hidden;
}

.page-img {
  max-height: 84vh;
  max-width: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
  user-select: none;
  -webkit-user-drag: none;
  filter: contrast(102%) brightness(98%);
  transition: transform 0.25s ease;
}

/* Sombra central del lomo del libro (Spine) */
.page-spine-shadow {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 50px;
  pointer-events: none;
  z-index: 5;
}

.page-left .page-spine-shadow {
  right: 0;
  background: linear-gradient(to left, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.2) 50%, transparent 100%);
}

.page-right .page-spine-shadow {
  left: 0;
  background: linear-gradient(to right, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.2) 50%, transparent 100%);
}

/* Sombra de profundidad en página individual */
.page-depth-shadow {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  box-shadow: inset 0 0 20px rgba(0,0,0,0.4);
  border: 1px solid rgba(255,255,255,0.08);
}

/* Número de Página Elegante */
.page-number-tag {
  position: absolute;
  bottom: 8px;
  right: 12px;
  background: rgba(14, 17, 23, 0.85);
  border: 1px solid var(--border-subtle);
  color: var(--gold-light);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  z-index: 6;
  letter-spacing: 0.5px;
}

.page-left .page-number-tag {
  left: 12px;
  right: auto;
}

/* Esquinas de curvatura de papel interactiva */
.page-curl-corner {
  position: absolute;
  bottom: 0;
  width: 45px;
  height: 45px;
  pointer-events: none;
  z-index: 6;
  opacity: 0.6;
  transition: all 0.3s ease;
}

.corner-right {
  right: 0;
  background: linear-gradient(135deg, transparent 50%, rgba(245, 176, 65, 0.2) 50%, rgba(255, 255, 255, 0.3) 100%);
}

.corner-left {
  left: 0;
  background: linear-gradient(225deg, transparent 50%, rgba(245, 176, 65, 0.2) 50%, rgba(255, 255, 255, 0.3) 100%);
}

.book-wrapper:hover .page-curl-corner {
  opacity: 1;
  width: 55px;
  height: 55px;
}

/* Página en blanco para balancear spreads */
.page-blank {
  width: 400px;
  height: 600px;
  background: #11141c;
  display: flex;
  align-items: center;
  justify-content: center;
}

.blank-text {
  font-family: var(--font-title);
  color: var(--gold-dark);
  font-size: 1.1rem;
}

/* Zonas de Clic para Pasar Página */
.flip-click-zone {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 25%;
  cursor: pointer;
  z-index: 20;
  transition: background 0.2s ease;
}

.zone-prev {
  left: 0;
}

.zone-next {
  right: 0;
}

.zone-prev:hover {
  background: linear-gradient(to right, rgba(245, 176, 65, 0.08), transparent);
}

.zone-next:hover {
  background: linear-gradient(to left, rgba(245, 176, 65, 0.08), transparent);
}

/* ==================== ANIMACIONES 3D FLIP ==================== */
.flip-next-anim {
  animation: flipPageNext 0.38s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.flip-prev-anim {
  animation: flipPagePrev 0.38s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes flipPageNext {
  0% {
    transform: rotateY(0deg) scale(1);
  }
  50% {
    transform: rotateY(-22deg) scale(0.97) translateX(-20px);
    box-shadow: -20px 30px 50px rgba(0, 0, 0, 0.9);
  }
  100% {
    transform: rotateY(0deg) scale(1);
  }
}

@keyframes flipPagePrev {
  0% {
    transform: rotateY(0deg) scale(1);
  }
  50% {
    transform: rotateY(22deg) scale(0.97) translateX(20px);
    box-shadow: 20px 30px 50px rgba(0, 0, 0, 0.9);
  }
  100% {
    transform: rotateY(0deg) scale(1);
  }
}

/* Responsive Book Styling */
@media (max-width: 1199px) {
  .book-wrapper.double-spread {
    display: none; /* Cambia a vista simple en tablets/móviles */
  }
  .page-img {
    max-height: 80vh;
    max-width: 95vw;
  }
}