diff --git a/frontend/src/components/ResponsePanel.tsx b/frontend/src/components/ResponsePanel.tsx
index 1c643cd..24432a0 100644
--- a/frontend/src/components/ResponsePanel.tsx
+++ b/frontend/src/components/ResponsePanel.tsx
@@ -7,7 +7,8 @@ import { processCitations, processCitationsForSubq, extractCitedSources } from '
 import { bulletizeMarkdown } from '../utils/citationParser'
 
 function getHighlightUrl(document_id: string, chunk_index: number, sub_question: string): string {
-  return `/api/v1/v2/highlights?document_id=${encodeURIComponent(document_id)}&chunk_index=${chunk_index}&sub_question=${encodeURIComponent(sub_question)}`
+  const base = 'http://localhost:8000/api/v1/v2'
+  return `${base}/highlights?document_id=${encodeURIComponent(document_id)}&chunk_index=${chunk_index}&sub_question=${encodeURIComponent(sub_question)}`
 }
 
 interface ResponsePanelProps {
@@ -171,7 +172,7 @@ function SubQuestionSections({
 
   useEffect(() => {
     if (!answer || isLoading || !subQuestionSources.length) return
-    
+
     const targets: Array<{
       document_id: string
       chunk_index: number
@@ -200,7 +201,7 @@ function SubQuestionSections({
     
     setHighlightStatus('loading')
     
-    fetch('/api/v1/v2/highlights/batch', {
+    fetch('http://localhost:8000/api/v1/v2/highlights/batch', {
       method: 'POST',
       headers: { 'Content-Type': 'application/json' },
       body: JSON.stringify({ targets }),
@@ -433,7 +434,7 @@ function FlatResponse({
   return (
     <div className="p-4 space-y-4">
       <div className="space-y-2">
-        <div className="flex items-start justify-between">
+      <div className="flex items-start justify-between">
           <div className="flex-1" />
           <button
             data-testid="copy-answer-btn"
diff --git a/frontend/src/utils/citationParser.ts b/frontend/src/utils/citationParser.ts
index 3794ee2..d472564 100644
--- a/frontend/src/utils/citationParser.ts
+++ b/frontend/src/utils/citationParser.ts
@@ -61,7 +61,8 @@ export function processCitationsForSubq(
 
 function buildCitationUrl(source: SourceMetadata, highlightReady?: boolean): string | null {
   if (highlightReady && source.document_id && source.sub_question_text) {
-    return `/api/v1/v2/highlights?document_id=${encodeURIComponent(source.document_id)}&chunk_index=${source.chunk_index}&sub_question=${encodeURIComponent(source.sub_question_text)}`
+    const base = 'http://localhost:8000/api/v1/v2'
+    return `${base}/highlights?document_id=${encodeURIComponent(source.document_id)}&chunk_index=${source.chunk_index}&sub_question=${encodeURIComponent(source.sub_question_text)}`
   }
   if (source.chunk_file_path) {
     return getPdfViewerUrl(