.upload-area {
  border: 2px dashed var(--border-color);
  border-radius: 8px;
  padding: 3rem 2rem;
  text-align: center;
  background-color: var(--card-bg);
  transition: all 0.2s ease;
  cursor: pointer;
  margin-bottom: 2rem;
}

.upload-area:hover,
.upload-area.dragover {
  border-color: var(--primary-color);
  background-color: rgba(62, 168, 255, 0.05);
}

.upload-area svg {
  width: 48px;
  height: 48px;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.upload-area.dragover svg {
  color: var(--primary-color);
}

.preview-container {
  background-color: var(--code-bg);
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  margin-bottom: 1rem;
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.image-item {
  position: relative;
  border-radius: 6px;
  overflow: hidden;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  aspect-ratio: 1;
  cursor: grab;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.image-item:active {
  cursor: grabbing;
}

.image-item img {
  width: 100%;
  height: 100%;
  object-fit: contain; /* display without stretching/cropping */
  background-color: #1e1e1e; /* dark container for imagery contrast */
  pointer-events: none; /* Prevent browser native drag */
}

.image-item .remove-btn {
  position: absolute;
  top: 4px;
  right: 4px;
  background-color: rgba(220, 53, 69, 0.9);
  color: white;
  border: none;
  border-radius: 4px;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s ease;
  z-index: 10;
}

.image-item:hover .remove-btn {
  opacity: 1;
}

.image-item .remove-btn:hover {
  background-color: rgba(220, 53, 69, 1);
}

.image-item .page-number {
  position: absolute;
  bottom: 4px;
  left: 4px;
  background-color: rgba(0, 0, 0, 0.7);
  color: white;
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 500;
  pointer-events: none;
}

/* SortableJS drag state */
.sortable-ghost {
  opacity: 0.4;
  background-color: var(--primary-color);
}
.sortable-drag {
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  z-index: 999;
}

.actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
}