/* PDF file list with thumbnails */
    .pdf-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
      margin-top: 20px;
      padding: 0;
    }
    .pdf-list-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 10px 14px;
      background: var(--color-bg);
      border: 1px solid var(--color-border-light);
      border-radius: var(--radius-sm);
      cursor: grab;
      user-select: none;
      transition: all var(--transition-fast);
    }
    .pdf-list-item:active {
      cursor: grabbing;
    }
    .pdf-list-item.dragging {
      opacity: 0.5;
      border-color: var(--color-primary);
      background: var(--color-primary-light);
    }
    .pdf-list-item.drag-over-item {
      border-top: 3px solid var(--color-primary);
    }
    .pdf-list-item .drag-handle {
      color: var(--color-text-muted);
      font-size: 1rem;
      flex-shrink: 0;
      cursor: grab;
      display: flex;
      align-items: center;
    }
    .pdf-list-item .thumb {
      width: 48px;
      height: 64px;
      object-fit: contain;
      border-radius: 6px;
      border: 1px solid var(--color-border-light);
      background: #fff;
      flex-shrink: 0;
    }
    .pdf-list-item .thumb-placeholder {
      width: 48px;
      height: 64px;
      border-radius: 6px;
      border: 1px solid var(--color-border-light);
      background: var(--color-surface);
      flex-shrink: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--color-text-muted);
      font-size: 0.7rem;
      font-weight: 600;
    }
    .pdf-list-item .pdf-info {
      flex: 1;
      min-width: 0;
    }
    .pdf-list-item .pdf-name {
      font-size: 0.85rem;
      font-weight: 500;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
      color: var(--color-text);
    }
    .pdf-list-item .pdf-meta {
      font-family: var(--font-mono);
      font-size: 0.72rem;
      color: var(--color-text-muted);
      margin-top: 2px;
    }
    .pdf-list-item .order-btns {
      display: flex;
      flex-direction: column;
      gap: 2px;
      flex-shrink: 0;
    }
    .pdf-list-item .order-btn {
      background: none;
      border: 1px solid var(--color-border-light);
      cursor: pointer;
      color: var(--color-text-muted);
      font-size: 0.7rem;
      padding: 2px 6px;
      border-radius: 4px;
      transition: all var(--transition-fast);
      line-height: 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .pdf-list-item .order-btn:hover {
      background: var(--color-primary-light);
      color: var(--color-primary);
      border-color: var(--color-primary-subtle);
    }
    .pdf-list-item .order-btn:disabled {
      opacity: 0.3;
      cursor: not-allowed;
    }
    .pdf-list-item .remove-btn {
      background: none;
      border: none;
      cursor: pointer;
      color: var(--color-text-muted);
      font-size: 1.2rem;
      padding: 4px 8px;
      border-radius: 4px;
      transition: all var(--transition-fast);
      flex-shrink: 0;
      line-height: 1;
    }
    .pdf-list-item .remove-btn:hover {
      background: var(--color-error-bg);
      color: var(--color-error);
    }

    .add-more-btn {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 10px 20px;
      margin-top: 12px;
      background: var(--color-surface);
      border: 1px dashed var(--color-border);
      border-radius: var(--radius-sm);
      font-family: var(--font-body);
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--color-text-secondary);
      cursor: pointer;
      transition: all var(--transition-fast);
      position: relative;
      overflow: hidden;
    }
    .add-more-btn:hover {
      border-color: var(--color-primary-subtle);
      background: var(--color-primary-light);
      color: var(--color-primary);
    }
    .add-more-btn input[type="file"] {
      position: absolute;
      inset: 0;
      opacity: 0;
      cursor: pointer;
    }

    /* PDF count badge */
    .pdf-count {
      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%;
    }

    /* Merge result summary */
    .merge-result {
      display: none;
      margin-top: 20px;
      padding: 20px;
      background: var(--color-bg);
      border: 1px solid var(--color-border-light);
      border-radius: var(--radius-sm);
      text-align: center;
    }
    .merge-result.visible {
      display: block;
    }
    .merge-result .result-icon {
      font-size: 2.5rem;
      margin-bottom: 10px;
    }
    .merge-result .result-title {
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--color-text);
      margin-bottom: 4px;
    }
    .merge-result .result-meta {
      font-family: var(--font-mono);
      font-size: 0.8rem;
      color: var(--color-text-muted);
      margin-bottom: 16px;
    }
    .merge-result .result-actions {
      display: flex;
      justify-content: center;
      gap: 12px;
      flex-wrap: wrap;
    }

    @media (max-width: 768px) {
      .pdf-list-item .order-btns {
        flex-direction: row;
      }
    }