/* The cover, model and controls share a stable frame while 3D loads. */
.book-3d {
  --book-3d-stage-height: clamp(300px, 38vw, 420px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: var(--book-3d-stage-height) 100px minmax(2.5em, auto);
  gap: 10px;
  width: 100%;
  max-width: 440px;
  margin-inline: auto;
  color: var(--text-primary, #f0f0f5);
  font-family: var(--font-sans, sans-serif);
  text-align: center;
}

.book-3d > .book-3d__poster,
.book-3d > .book-3d__viewer {
  grid-area: 1 / 1;
  display: block;
  width: 100%;
  height: var(--book-3d-stage-height);
  min-width: 0;
}

.book-3d > .book-3d__poster {
  object-fit: contain;
  padding: 10px;
}

.book-3d__viewer {
  opacity: 0;
  pointer-events: none;
  --poster-color: transparent;
  --progress-bar-color: var(--accent-gold, #d4a853);
  --progress-bar-height: 2px;
  touch-action: pan-y;
  background: transparent;
}

.book-3d--ready > .book-3d__viewer {
  opacity: 1;
  pointer-events: auto;
}

.book-3d__controls {
  grid-area: 2 / 1;
  display: grid;
  align-content: center;
  gap: 6px;
}

.book-3d__views,
.book-3d__zoom {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.book-3d__controls button,
.book-3d > .book-3d__load {
  min-width: 0;
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--bg-glass-border, rgba(255, 255, 255, 0.15));
  border-radius: var(--radius-sm, 6px);
  background: var(--bg-glass, rgba(255, 255, 255, 0.03));
  color: var(--text-secondary, #9ca3af);
  font: inherit;
  font-size: 0.75rem;
  line-height: 1.4;
  text-align: center;
  cursor: pointer;
}

.book-3d__controls button:hover:not(:disabled),
.book-3d > .book-3d__load:hover,
.book-3d__controls button[aria-pressed='true'] {
  border-color: var(--accent-gold, #d4a853);
  color: var(--accent-gold-light, #e8c674);
  background: rgba(212, 168, 83, 0.08);
}

.book-3d__controls button:focus-visible,
.book-3d > .book-3d__load:focus-visible {
  outline: 2px solid var(--accent-gold-light, #e8c674);
  outline-offset: 3px;
}

.book-3d__zoom button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  font-size: 1.1rem;
}

.book-3d__zoom button:disabled {
  opacity: 0.35;
  cursor: default;
}

.book-3d__zoom-status {
  min-width: 50px;
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
}

.book-3d > .book-3d__load {
  grid-area: 2 / 1;
  justify-self: center;
}

.book-3d > .book-3d__hint {
  grid-area: 3 / 1;
  margin: 0;
  color: var(--text-secondary, #9ca3af);
  font-size: 0.75rem;
  font-style: normal;
  line-height: 1.5;
}

.book-3d [hidden] {
  display: none !important;
}

@media (max-width: 480px) {
  .book-3d {
    --book-3d-stage-height: 330px;
  }

  .book-3d__controls button {
    padding-inline: 10px;
  }
}