/* Thumbnail grid */
    .page-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
      gap: 16px;
      margin-top: 16px;
    }
    .page-thumb {
      position: relative;
      border: 3px solid var(--color-border-light);
      border-radius: var(--radius-sm);
      overflow: hidden;
      cursor: pointer;
      transition: all var(--transition-fast);
      background: var(--color-surface);
      aspect-ratio: auto;
    }
    .page-thumb:hover {
      border-color: var(--color-primary-subtle);
      box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    }
    .page-thumb.selected {
      border-color: #2563eb;
      box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.25), 0 2px 8px rgba(37, 99, 235, 0.15);
    }
    .page-thumb canvas {
      display: block;
      width: 100%;
      height: auto;
    }
    .page-thumb .page-number {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      text-align: center;
      padding: 4px 0;
      background: rgba(255,255,255,0.92);
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--color-text-secondary);
      border-top: 1px solid var(--color-border-light);
    }
    .page-thumb.selected .page-number {
      background: #2563eb;
      color: #fff;
      border-top-color: #2563eb;
    }
    .page-thumb .check-overlay {
      position: absolute;
      top: 6px;
      right: 6px;
      width: 24px;
      height: 24px;
      border-radius: 50%;
      background: #2563eb;
      display: none;
      align-items: center;
      justify-content: center;
      box-shadow: 0 1px 4px rgba(0,0,0,0.2);
    }
    .page-thumb.selected .check-overlay {
      display: flex;
    }
    .page-thumb .check-overlay svg {
      width: 14px;
      height: 14px;
      stroke: #fff;
      stroke-width: 3;
      fill: none;
    }

    /* Selection controls */
    .selection-bar {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 20px;
      padding: 14px 18px;
      background: var(--color-surface);
      border: 1px solid var(--color-border-light);
      border-radius: var(--radius-sm);
    }
    .selection-count {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--color-text);
      white-space: nowrap;
    }
    .selection-count span {
      color: var(--color-primary);
    }
    .quick-select-btns {
      display: flex;
      gap: 6px;
      flex-wrap: wrap;
    }
    .quick-btn {
      padding: 6px 14px;
      background: var(--color-bg);
      border: 1px solid var(--color-border);
      border-radius: 100px;
      font-family: var(--font-body);
      font-size: 0.78rem;
      font-weight: 600;
      color: var(--color-text-secondary);
      cursor: pointer;
      transition: all var(--transition-fast);
      white-space: nowrap;
    }
    .quick-btn:hover {
      border-color: var(--color-primary-subtle);
      background: var(--color-primary-light);
      color: var(--color-primary);
    }

    /* Page range input */
    .range-input-group {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-top: 12px;
    }
    .range-input-group input[type="text"] {
      padding: 8px 14px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      font-family: var(--font-mono);
      font-size: 0.82rem;
      color: var(--color-text);
      background: var(--color-bg);
      width: 240px;
      max-width: 100%;
      transition: border-color var(--transition-fast);
    }
    .range-input-group input[type="text"]:focus {
      outline: none;
      border-color: var(--color-primary);
      box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.15);
    }
    .range-input-group input[type="text"]::placeholder {
      color: var(--color-text-muted);
    }
    .apply-range-btn {
      padding: 8px 16px;
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      font-family: var(--font-body);
      font-size: 0.82rem;
      font-weight: 600;
      color: var(--color-text-secondary);
      cursor: pointer;
      transition: all var(--transition-fast);
      white-space: nowrap;
    }
    .apply-range-btn:hover {
      border-color: var(--color-primary-subtle);
      background: var(--color-primary-light);
      color: var(--color-primary);
    }

    /* File info badge */
    .file-info-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      background: var(--color-primary-light);
      color: var(--color-primary);
      border-radius: 100px;
      font-size: 0.8rem;
      font-weight: 600;
      margin-bottom: 12px;
    }

    /* Progress indicator */
    .progress-bar-wrap {
      width: 100%;
      height: 6px;
      background: var(--color-border);
      border-radius: 3px;
      margin-top: 16px;
      overflow: hidden;
      display: none;
    }
    .progress-bar-wrap.visible {
      display: block;
    }
    .progress-bar-fill {
      height: 100%;
      background: var(--color-primary);
      border-radius: 3px;
      transition: width 0.3s ease;
      width: 0%;
    }

    /* Loading spinner for thumbnails */
    .loading-wrap {
      text-align: center;
      padding: 40px 20px;
    }
    .loading-spinner {
      display: inline-block;
      width: 36px;
      height: 36px;
      border: 3px solid var(--color-border);
      border-top-color: var(--color-primary);
      border-radius: 50%;
      animation: spin 0.8s linear infinite;
    }
    @keyframes spin {
      to { transform: rotate(360deg); }
    }
    .loading-wrap p {
      margin-top: 12px;
      font-size: 0.85rem;
      color: var(--color-text-muted);
    }

    @media (max-width: 768px) {
      .page-grid {
        grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
        gap: 10px;
      }
      .selection-bar {
        flex-direction: column;
        align-items: flex-start;
      }
      .range-input-group {
        flex-direction: column;
        align-items: stretch;
      }
      .range-input-group input[type="text"] {
        width: 100%;
      }
    }