l>
                        </div>
                    </div>
                    <select name="source" id="source" onchange="toggleSplitInput()" 
                            style="font-family: monospace; font-size: 1.1em;">
                        <option value="jsonl">JSONL</option>
                        <option value="json">JSON</option>
                        <option value="hf">HuggingFace</option>
                    </select>
                </div>
                <div class="form-group" id="hf_gro