/* Vista previa flipbook — El Kit del Jubilado */
.flipbook-section {
  padding: 48px 0 56px;
  background: #fff;
}

.flipbook-section__head {
  text-align: center;
  max-width: 40em;
  margin: 0 auto 28px;
}

.flipbook-section__head h2 {
  margin: 0 0 0.4em;
  font-size: clamp(1.5rem, 3vw, 2rem);
}

.flipbook-section__head p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.flipbook {
  --fb-shadow: 0 24px 48px rgba(17, 17, 17, 0.18);
  --fb-w: min(920px, 100%);
  --fb-duration: 0.85s;
  max-width: var(--fb-w);
  margin: 0 auto;
  color: var(--black);
  font-family: Georgia, "Times New Roman", serif;
}

.flipbook__stage {
  position: relative;
  perspective: 2200px;
  margin-bottom: 18px;
}

.flipbook__book {
  position: relative;
  width: var(--fb-w);
  aspect-ratio: 296 / 210; /* dos páginas A5 (148×210 mm) */
  height: auto;
  margin: 0 auto;
  border-radius: 6px;
  box-shadow: var(--fb-shadow);
  background: var(--black);
  overflow: hidden;
  touch-action: pan-y;
}

.flipbook__spread {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: #fff;
}

.flipbook__page {
  position: relative;
  overflow: hidden;
  background: #fff;
  display: flex;
  align-items: stretch;
  justify-content: center;
}

.flipbook__page--left {
  border-right: 1px solid rgba(17, 17, 17, 0.08);
}

.flipbook__page img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
  user-select: none;
  -webkit-user-drag: none;
  pointer-events: none;
}

.flipbook__spine {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 14px;
  margin-left: -7px;
  background: linear-gradient(90deg, var(--black), var(--orange) 45%, var(--black));
  box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.35);
  z-index: 20;
  pointer-events: none;
}

.flipbook__sheets {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.flipbook__sheet {
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  transform-style: preserve-3d;
  transform-origin: left center;
  transition: transform var(--fb-duration) cubic-bezier(0.45, 0.05, 0.2, 1);
  z-index: calc(10 + var(--sheet-index, 0));
  opacity: 0;
  pointer-events: none;
}

.flipbook__sheet.is-turned,
.flipbook__sheet.is-flipping {
  opacity: 1;
}

.flipbook__sheet.is-turned {
  transform: rotateY(-180deg);
}

.flipbook__face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  overflow: hidden;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.flipbook__face img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
  user-select: none;
  -webkit-user-drag: none;
  pointer-events: none;
}

.flipbook__face--back {
  transform: rotateY(180deg);
}

.flipbook__purchase {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease;
  z-index: 30;
}

.flipbook__purchase.is-visible {
  opacity: 1;
  visibility: visible;
}

.flipbook__purchase-page {
  background: #fff;
  border-right: 1px solid rgba(17, 17, 17, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
}

.flipbook__purchase-page img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.flipbook__purchase-cta {
  background: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 28px 24px;
  gap: 14px;
}

.flipbook__purchase-cta h3 {
  margin: 0;
  font-size: 1.35rem;
  line-height: 1.25;
  color: var(--black);
}

.flipbook__purchase-cta p {
  margin: 0;
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.5;
  max-width: 18em;
}

.flipbook__purchase-price {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--orange);
  font-family: system-ui, -apple-system, sans-serif;
}

.flipbook__purchase-cta .btn {
  background: var(--orange);
  border-color: var(--orange);
  font-family: system-ui, -apple-system, sans-serif;
  min-width: 240px;
}

.flipbook__purchase-cta .btn:hover {
  background: var(--orange-dark);
  border-color: var(--orange-dark);
}

.flipbook__hit {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  z-index: 40;
}

.flipbook__hit button {
  appearance: none;
  border: 0;
  background: transparent;
  cursor: pointer;
  padding: 0;
}

.flipbook__hit button:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: -3px;
}

.flipbook__toolbar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  font-family: system-ui, -apple-system, sans-serif;
}

.flipbook__nav {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.flipbook__arrow {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid rgba(17, 17, 17, 0.15);
  background: #fff;
  color: var(--black);
  font-size: 1.35rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.flipbook__arrow:hover:not(:disabled) {
  background: #fff;
  border-color: var(--orange);
  color: var(--orange);
}

.flipbook__arrow:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.flipbook__arrow:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 2px;
}

.flipbook__counter {
  min-width: 9em;
  text-align: center;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--black);
}

.flipbook__hint {
  margin: 12px 0 0;
  text-align: center;
  font-size: 0.82rem;
  color: var(--muted);
  font-family: system-ui, -apple-system, sans-serif;
}

/* Móvil: una sola página A5 */
@media (max-width: 700px) {
  .flipbook {
    --fb-w: min(420px, 100%);
  }

  .flipbook__book {
    aspect-ratio: 148 / 210;
  }

  .flipbook__spread,
  .flipbook__purchase {
    grid-template-columns: 1fr;
  }

  .flipbook__page--left,
  .flipbook__purchase-page {
    display: none;
  }

  .flipbook__spine {
    display: none;
  }

  .flipbook__sheet {
    width: 100%;
    transform-origin: center center;
  }

  .flipbook__purchase.is-visible .flipbook__purchase-page {
    display: none;
  }

  .flipbook__purchase.is-visible {
    grid-template-columns: 1fr;
  }

  .flipbook__purchase-cta {
    min-height: 0;
  }

  .flipbook__hit {
    grid-template-columns: 1fr 2fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .flipbook__sheet {
    transition: none;
  }

  .flipbook__purchase {
    transition: none;
  }
}