/* Spinner overlay */
#loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255,255,255,0.9);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
}

/* Controls */
#controls {
  margin: 10px;
  text-align: center;
}

/* Book container */
#book {
  width: 95vw;
  max-width: 1000px;
  height: 85vh;
  margin: auto;
}

/* Page styling */
.page {
  background: white;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

/* Make canvas responsive */
.page canvas {
  width: 100%;
  height: auto;
  max-height: 100%;
  object-fit: contain;
}

/* Dark mode */
.dark-mode {
  background-color: #121212;
}

.dark-mode .page {
  background-color: #1e1e1e;
}

/* 📱 Mobile Optimization */
@media (max-width: 768px) {
  #book {
    width: 100vw;
    height: 75vh;
  }
}