.viewer {
  padding: 32px;
  overflow: hidden;
  background: radial-gradient(ellipse at 50% 30%, #f6f0e4, #d9d0c1);
}

.viewer-stage {
  perspective: 1900px;
  padding: 22px 12px 35px;
  touch-action: pan-y;
}

.book {
  position: relative;
  width: min(100%, 960px);
  aspect-ratio: 4725 / 3308;
  margin: 0 auto;
  transform-style: preserve-3d;
  filter: drop-shadow(0 22px 16px rgba(47, 35, 23, .16));
}

.viewer .book-page-layer {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  transform-style: preserve-3d;
  backface-visibility: hidden;
  will-change: transform, filter;
}

.viewer .book-page-view {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
}

.viewer .book-surface {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #fdfcf9;
  box-shadow: 0 3px 0 #e7e1d7, 0 6px 0 #fff, 0 9px 0 #cbc4b7, 0 25px 35px rgba(48, 37, 21, .27);
}

.viewer-stage .book-page-layer img {
  display: block;
  width: 100%;
  height: 100%;
  max-height: none;
  object-fit: contain;
  background: #fdfcf9;
  filter: none;
  animation: none;
  user-select: none;
}

.viewer .book-page-view.is-cover .book-surface {
  width: 49.4%;
  box-shadow: 6px 7px 0 #d8d0c5, 12px 14px 22px rgba(45, 34, 22, .22);
}

.viewer .book-page-view.is-cover .book-surface > img {
  position: absolute;
  top: 0;
  width: 200%;
  max-width: none;
  height: 100%;
  object-fit: fill;
}

.viewer .book-page-view.is-front .book-surface > img { right: 0; }
.viewer .book-page-view.is-back .book-surface > img { left: 0; }

.viewer .book-page-view.is-spread .book-surface::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(50% - 9px);
  width: 18px;
  background: linear-gradient(90deg, transparent, rgba(0, 0, 0, .2), rgba(255, 255, 255, .15), transparent);
  mix-blend-mode: multiply;
  opacity: .38;
  pointer-events: none;
}

.viewer .effect-turn3d .outgoing { z-index: 2; }
.viewer .effect-turn3d .incoming { z-index: 1; }

.viewer .effect-turn3d .outgoing.next {
  transform-origin: 0 50%;
  animation: bookTurnOutNext 920ms cubic-bezier(.45, .02, .12, .98) both;
}

.viewer .effect-turn3d .incoming.next {
  transform-origin: 100% 50%;
  animation: bookTurnInNext 920ms cubic-bezier(.45, .02, .12, .98) both;
}

.viewer .effect-turn3d .outgoing.prev {
  transform-origin: 100% 50%;
  animation: bookTurnOutPrev 920ms cubic-bezier(.45, .02, .12, .98) both;
}

.viewer .effect-turn3d .incoming.prev {
  transform-origin: 0 50%;
  animation: bookTurnInPrev 920ms cubic-bezier(.45, .02, .12, .98) both;
}

@keyframes bookTurnOutNext {
  0% { transform: rotateY(0); filter: brightness(1); }
  55% { filter: brightness(.64); }
  100% { transform: rotateY(-104deg); filter: brightness(.4); }
}

@keyframes bookTurnInNext {
  0% { transform: rotateY(94deg); filter: brightness(.5); }
  60% { filter: brightness(.82); }
  100% { transform: rotateY(0); filter: brightness(1); }
}

@keyframes bookTurnOutPrev {
  0% { transform: rotateY(0); filter: brightness(1); }
  55% { filter: brightness(.64); }
  100% { transform: rotateY(104deg); filter: brightness(.4); }
}

@keyframes bookTurnInPrev {
  0% { transform: rotateY(-94deg); filter: brightness(.5); }
  60% { filter: brightness(.82); }
  100% { transform: rotateY(0); filter: brightness(1); }
}

.book-thumbnails {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.book-thumb {
  min-width: 64px;
  padding: 6px;
  border: 2px solid transparent;
  border-radius: 0;
  background: rgba(255, 255, 255, .55);
  color: var(--ink);
  font-size: 11px;
  cursor: pointer;
}

.book-thumb img {
  display: block;
  width: 66px;
  height: 46px;
  object-fit: contain;
  margin-bottom: 5px;
}

.book-thumb[aria-current=true] {
  border-color: var(--accent);
  background: #fff;
}

.book-thumb:hover { background: #fff; }

.zoom-scroll {
  overflow: auto;
  max-height: 72vh;
}

.zoom-scroll img {
  display: block;
  width: 100%;
  max-width: none;
  max-height: none;
  margin: auto;
}

.zoom-scroll.detailed img {
  width: 200%;
  max-width: none;
}

.zoom-toolbar {
  display: flex;
  gap: 15px;
  align-items: center;
  margin: 10px 0;
}

.viewer-stage[aria-busy=true] { cursor: progress; }
.viewer .helper { text-align: center; }
#pageStatus { min-width: 150px; text-align: center; font-size: 14px; }

@media (max-width: 600px) {
  .viewer { padding: 16px 10px; }
  .viewer-stage { padding: 16px 4px 25px; }
  .book { width: 100%; filter: drop-shadow(0 12px 10px rgba(47, 35, 23, .16)); }
  .book-thumbnails { gap: 5px; }
  .book-thumb { min-width: 48px; padding: 4px; font-size: 10px; }
  .book-thumb img { width: 47px; height: 34px; }
  .zoom-toolbar { flex-wrap: wrap; }
  .viewer-controls { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
  #pageStatus { grid-column: 1 / -1; grid-row: 1; min-width: 0; }
  .viewer-controls .button { width: 100%; padding: 12px; }
  .viewer-controls .text-button { grid-column: 1 / -1; justify-self: center; }
}

@media (prefers-reduced-motion: reduce) {
  .viewer .book-page-layer { animation: none !important; }
}

.hero-main-photo {
  height: auto;
  aspect-ratio: 1.43;
  background: #e8e3da;
  transform: rotate(2deg);
  border-radius: 0;
  box-shadow: 0 4px 0 white, 0 8px 0 #d8d1c6, 0 22px 45px #0002;
}

.hero-main-photo img { object-fit: contain; }
.offer-photo { height: auto; object-fit: contain; border-radius: 0; }
.album-next { text-align: center; margin: 28px 0 12px; border-top: 1px solid #0002; padding-top: 24px; }
.album-next h3 { font-size: 26px; margin: 0 0 8px; }
.album-next p { color: var(--muted); margin-bottom: 22px; }
.faq { max-width: 850px; }
.faq details { border-bottom: 1px solid var(--line); padding: 22px 0; }
.faq summary { font-weight: bold; font-size: 20px; cursor: pointer; }
.faq p { line-height: 1.6; color: var(--muted); }
.order-terms { padding: 16px; background: #f5f1e9; border-radius: 0; margin: 16px 0; font-size: 14px; line-height: 1.5; }
.order-terms p { margin: 8px 0 0; }

@media print {
  .order-terms { padding: 8px; font-size: 10pt; }
}