File List -->
                <div class="file-list" id="file-list"></div>

                <!-- Tool Options -->
                <div class="tool-options" id="tool-options">
                    <div class="option-group">
                        <p>Click "Process Files" after selecting two PDFs. We'll render pages side-by-side and highlight differences.</p>
                    </div>
                </div>

                <!-- Process Button -->
                <div class="process-section">
               