/* CSS for 2D Book Viewer */

.flipbook-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 580px;
  margin: 20px 0;
  perspective: 1200px;
  perspective-origin: center center;
}

.book-viewer-wrapper {
  perspective: 1200px;
  perspective-origin: center center;
  transition: all 0.8s ease-out;
}

.book-viewer-wrapper.opened {
  transform: translateX(150px);
}

.book {
  position: relative;
  width: 384px;
  height: 540px;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* Book spine/binding */
.book-spine {
  position: absolute;
  left: 0;
  top: 0;
  width: 8px;
  height: 100%;
  background: #e5e7eb;
  border-radius: 8px 0 0 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  z-index: 10;
}

/* Dark mode spine */
@media (prefers-color-scheme: dark) {
  .book-spine {
    background: #374151;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  }
}

.page {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transform-origin: left center;
  transition: transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  cursor: pointer;
}

.page-front,
.page-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border: 1px solid #e5e7eb;
  border-radius: 0 8px 8px 0;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  background: white;
  overflow: hidden;
}

/* Dark mode pages */
@media (prefers-color-scheme: dark) {
  .page-front,
  .page-back {
    border: 1px solid #374151;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
    background: #1f2937;
  }
}

.page-back {
  transform: rotateY(180deg);
  border-radius: 8px 0 0 8px;
}

.page.flipped {
  transform: rotateY(-180deg);
}

.page:hover {
  transform: rotateY(-5deg);
}

.page.flipped:hover {
  transform: rotateY(-175deg);
}

/* PDF rendering styles */
.pdf-page-container {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background: white;
  overflow: hidden;
}

.pdf-page-canvas {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  pointer-events: none;
}

.empty-page {
  width: 100%;
  height: 100%;
  display: flex;
  items-center: center;
  justify-content: center;
  background: #f9fafb;
  color: #9ca3af;
  font-size: 14px;
}

/* Book back cover - now displays PDF page */
.book-back-cover {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 0 8px 8px 0;
  z-index: 0;
  overflow: hidden;
}

/* Dark mode back cover */
@media (prefers-color-scheme: dark) {
  .book-back-cover {
    background: #1f2937;
    border: 1px solid #374151;
  }
}

/* Canvas automatically scales with container - no mobile-specific adjustments needed */

/* Controls removed - page flipping is now click-only */

/* Loading state */
.flipbook-loading {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 500px;
  font-size: 16px;
  color: #6b7280;
}

.loading-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid #e5e7eb;
  border-top: 2px solid #374151;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-right: 12px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Responsive design */
@media (max-width: 768px) {
  .book {
    width: 180px;
    height: 253px;
  }
  
  .book-spine {
    width: 6px;
  }
  
  .book-viewer-wrapper.opened {
    transform: translateX(70px);
  }
  
  .flipbook-container {
    min-height: 280px;
    margin: 15px 0;
  }
}

@media (max-width: 480px) {
  .book {
    width: 150px;
    height: 211px;
  }
  
  .book-spine {
    width: 5px;
  }
  
  .book-viewer-wrapper.opened {
    transform: translateX(60px);
  }
  
  .flipbook-container {
    margin: 10px 0;
    min-height: 240px;
  }
}

@media (max-width: 360px) {
  .book {
    width: 128px;
    height: 180px;
  }
  
  .book-spine {
    width: 4px;
    border-radius: 4px 0 0 4px;
  }
  
  .book-viewer-wrapper.opened {
    transform: translateX(50px);
  }
  
  .flipbook-container {
    margin: 8px 0;
    min-height: 200px;
  }
}