/* ═══════════════════════════════════════════════════════════
   FLIPBOOK — Galeria Sensorial
   3D page-turning book effect (portrait 0.70 ratio)
   ═══════════════════════════════════════════════════════════ */

.flipbook-wrapper {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  margin-top: clamp(2rem, 5vw, 4rem);
  padding: 0 1rem;
  -webkit-user-select: none;
  user-select: none;
}

/* ─── Book container ─── */
.flipbook {
  position: relative;
  width: min(88vw, 520px);
  aspect-ratio: 7 / 10;
  perspective: 2200px;
  perspective-origin: center center;
  cursor: pointer;
}

/* ─── Individual page ─── */
.flipbook-page {
  position: absolute;
  inset: 0;
  border-radius: 3px 12px 12px 3px;
  overflow: hidden;
  box-shadow:
    2px 0 8px rgba(75, 55, 48, 0.12),
    6px 4px 20px rgba(75, 55, 48, 0.08);
  will-change: transform, opacity;
  transform-origin: left center;
  transform-style: preserve-3d;
  backface-visibility: hidden;
  z-index: 1;
  background: var(--cream, #fff8ef);
}

.flipbook-page img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  pointer-events: none;
  border-radius: inherit;
}

/* ─── Spine shadow (static edge on the left) ─── */
.flipbook::before {
  content: "";
  position: absolute;
  left: 0;
  top: 2%;
  bottom: 2%;
  width: 18px;
  z-index: 500;
  background: linear-gradient(90deg, rgba(75, 55, 48, 0.2), transparent);
  border-radius: 3px 0 0 3px;
  pointer-events: none;
}

/* ─── Page stack shadow ─── */
.flipbook::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 499;
  border-radius: inherit;
  box-shadow:
    inset 8px 0 16px -8px rgba(75, 55, 48, 0.15),
    inset -4px 0 8px -4px rgba(75, 55, 48, 0.05);
  pointer-events: none;
}

/* ─── Click zones ─── */
.flipbook-click-left,
.flipbook-click-right {
  position: absolute;
  top: 0;
  bottom: 0;
  z-index: 490;
  cursor: pointer;
}

.flipbook-click-left {
  left: 0;
  width: 40%;
}

.flipbook-click-right {
  right: 0;
  width: 40%;
}

.flipbook-click-left:hover,
.flipbook-click-right:hover {
  background: rgba(155, 74, 90, 0.04);
}

/* ═══════════════════════════════════════════════════════════
   FLIP ANIMATIONS (3D transforms)
   ═══════════════════════════════════════════════════════════ */

.flipbook-page.flip-forward {
  animation: flipForward 900ms cubic-bezier(0.4, 0.0, 0.2, 1) forwards;
  z-index: 400 !important;
}

.flipbook-page.flip-backward {
  animation: flipBackward 900ms cubic-bezier(0.4, 0.0, 0.2, 1) forwards;
  z-index: 400 !important;
}

@keyframes flipForward {
  0% {
    transform: rotateY(0deg);
    opacity: 1;
  }
  20% {
    opacity: 1;
  }
  100% {
    transform: rotateY(-160deg);
    opacity: 0;
  }
}

@keyframes flipBackward {
  0% {
    transform: rotateY(-160deg);
    opacity: 0;
  }
  80% {
    opacity: 1;
  }
  100% {
    transform: rotateY(0deg);
    opacity: 1;
  }
}

/* ─── Drop shadow during flip ─── */
.flipbook-page.flip-forward,
.flipbook-page.flip-backward {
  filter: drop-shadow(-8px 0 18px rgba(75, 55, 48, 0.25));
}

/* ─── Touch drag state ─── */
.flipbook-page[style*="rotateY"] {
  will-change: transform, opacity;
}

/* ═══════════════════════════════════════════════════════════
   NAVIGATION ARROWS
   ═══════════════════════════════════════════════════════════ */

.flipbook-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 510;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 248, 239, 0.92);
  box-shadow: 0 4px 16px rgba(75, 55, 48, 0.15);
  color: var(--text, #4b3730);
  font-size: 1.3rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 250ms ease, transform 250ms ease, box-shadow 250ms ease;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.flipbook-nav:hover {
  background: var(--cream, #fff8ef);
  box-shadow: 0 6px 22px rgba(75, 55, 48, 0.2);
  transform: translateY(-50%) scale(1.08);
}

.flipbook-nav:active {
  transform: translateY(-50%) scale(0.96);
}

.flipbook-nav[disabled] {
  opacity: 0.3;
  cursor: default;
  pointer-events: none;
}

.flipbook-prev {
  left: -24px;
}

.flipbook-next {
  right: -24px;
}

.flipbook-prev svg,
.flipbook-next svg {
  width: 20px;
  height: 20px;
  stroke: var(--text, #4b3730);
  stroke-width: 2.2;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ═══════════════════════════════════════════════════════════
   PAGE COUNTER
   ═══════════════════════════════════════════════════════════ */

.flipbook-counter {
  font-family: var(--typewriter, "Special Elite", monospace);
  font-size: clamp(0.85rem, 2vw, 0.95rem);
  color: var(--ink-soft, rgba(75, 55, 48, 0.72));
  letter-spacing: 0.08em;
  background: var(--cream, #fff8ef);
  padding: 0.4rem 1.2rem;
  border-radius: 999px;
  box-shadow: 0 2px 10px rgba(75, 55, 48, 0.08);
}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════ */

@media (max-width: 900px) {
  .flipbook {
    width: min(90vw, 460px);
  }
}

@media (max-width: 640px) {
  .flipbook {
    width: 92vw;
  }

  .flipbook-nav {
    width: 38px;
    height: 38px;
    font-size: 1.1rem;
  }

  .flipbook-prev {
    left: -12px;
  }

  .flipbook-next {
    right: -12px;
  }

  .flipbook-click-left {
    width: 48%;
  }

  .flipbook-click-right {
    width: 48%;
  }
}

/* ═══════════════════════════════════════════════════════════
   REDUCED MOTION
   ═══════════════════════════════════════════════════════════ */

@media (prefers-reduced-motion: reduce) {
  .flipbook-page.flip-forward {
    animation: none;
    opacity: 0;
    transform: rotateY(-160deg);
  }

  .flipbook-page.flip-backward {
    animation: none;
    opacity: 1;
    transform: rotateY(0deg);
  }

  .flipbook-nav {
    transition: none;
  }
}