## MODIFIED Requirements

### Requirement: Enhanced PDF Export with Layout Preservation

The PDF export SHALL accurately preserve document layout from both OCR and direct extraction tracks with correct coordinate transformation and multi-page support. For Direct Track, a background image rendering approach SHALL be used for visual fidelity.

#### Scenario: OCR Track reflow PDF uses raw OCR regions
- **WHEN** generating reflow PDF for an OCR Track document
- **THEN** the system SHALL load text content from `raw_ocr_regions.json` files
- **AND** text blocks SHALL be sorted by Y coordinate for reading order
- **AND** all text content SHALL match the Layout PDF output
- **AND** images and charts SHALL be embedded from element `saved_path`

#### Scenario: Direct Track reflow PDF uses structured content
- **WHEN** generating reflow PDF for a Direct Track document
- **THEN** the system SHALL use `content.cells` for table rendering
- **AND** text elements SHALL use `content` string directly
- **AND** images and charts SHALL be embedded from element `saved_path`

#### Scenario: Reflow PDF content consistency
- **WHEN** comparing Layout PDF and Reflow PDF for the same document
- **THEN** both PDFs SHALL contain the same text content
- **AND** only the presentation format SHALL differ (positioned vs flowing)