diff --git a/web/components/Collapsible.tsx b/web/components/Collapsible.tsx
index 4f79522..0e93f38 100644
--- a/web/components/Collapsible.tsx
+++ b/web/components/Collapsible.tsx
@@ -56,7 +56,7 @@ export function Collapsible({
         aria-expanded={open}
         className="flex w-full items-baseline justify-between gap-2 px-4 py-3 text-left transition hover:bg-zinc-900/60"
       >
-        <span className="flex items-center gap-2 text-sm font-medium text-zinc-200">
+        <span className="flex min-w-0 items-center gap-2 text-sm font-medium text-zinc-200">
           <span
             className={`inline-block text-[10px] text-zinc-500 transition-transform ${
               open ? "rotate-90" : ""
@@ -68,7 +68,13 @@ export function Collapsible({
           {title}
         </span>
         {subtitle != null && (
-          <span className="shrink-0 text-[10px] text-zinc-500">{subtitle}</span>
+          // min-w-0 + truncate: subtitle 이 길어지면(예: PriceTargets 의 "목표 1,234,567 ·
+          // 손절 987,654") 사이드바 폭을 넘기는 대신 말줄임표로 끝나도록. shrink-0 였을 땐
+          // title 을 밀어내며 헤더가 두 줄로 깨질 수 있었음. title 쪽도 min-w-0 을 줘 flex
+          // shrink 계산이 올바르게 되도록.
+          <span className="min-w-0 truncate text-[10px] text-zinc-500">
+            {subtitle}
+          </span>
         )}
       </button>
       <div className={open ? "border-t border-zinc-800 px-4 pb-4 pt-3" : "hidden"}>