/**
 * PDF-VIEWER MODULE: Thumbnails
 */
.pdf-viewer-sidebar { width: 200px; background: #1a1a1a; overflow-y: auto; padding: 10px; }
.pdf-thumbnail { border: 2px solid transparent; border-radius: 4px; cursor: pointer; margin-bottom: 10px; }
.pdf-thumbnail.active { border-color: var(--secondary-color); }
.pdf-thumbnail canvas { width: 100%; display: block; }