diff --git a/src/pages/launcher/LauncherSourcePage.tsx b/src/pages/launcher/LauncherSourcePage.tsx
index 04dc8a6..cfba68b 100644
--- a/src/pages/launcher/LauncherSourcePage.tsx
+++ b/src/pages/launcher/LauncherSourcePage.tsx
@@ -315,23 +315,23 @@ function DiffViewer({ diff }: { diff: string }) {
     const section = sectionRefs.current[file.id];
     if (!scroller || !section) return;
     scroller.scrollTo({
-      top: section.offsetTop - scroller.offsetTop - 12,
+      top: Math.max(section.offsetTop - 12, 0),
       behavior: 'smooth'
     });
   };
 
   return (
-    <div className="grid max-h-[56vh] overflow-hidden rounded-md border border-border bg-[#080b10] text-xs leading-5 lg:grid-cols-[280px_minmax(0,1fr)]">
-      <aside className="border-b border-slate-700/80 bg-[#0b0f14] lg:border-b-0 lg:border-r">
+    <div className="grid h-[56vh] min-h-0 overflow-hidden rounded-md border border-border bg-[#080b10] text-xs leading-5 lg:grid-cols-[280px_minmax(0,1fr)]">
+      <aside className="min-h-0 border-b border-slate-700/80 bg-[#0b0f14] lg:border-b-0 lg:border-r">
         <div className="border-b border-slate-700/80 bg-[#111827] px-3 py-2">
           <p className="text-[12px] font-semibold text-slate-100">변경 파일</p>
           <p className="mt-0.5 text-[11px] text-slate-400">총 {files.length}개</p>
         </div>
-        <div className="max-h-44 overflow-y-auto p-2 lg:max-h-[calc(56vh-50px)]">
+        <div className="h-44 overflow-y-auto p-2 lg:h-[calc(56vh-50px)]">
           <DiffTree nodes={tree} onSelect={scrollToFile} />
         </div>
       </aside>
-      <div ref={scrollerRef} className="min-w-0 overflow-auto p-3 font-mono">
+      <div ref={scrollerRef} className="min-h-0 min-w-0 overflow-auto p-3 font-mono">
         <div className="space-y-4">
         {files.map((file) => (
           <section