--- 03-fixed script
+++ 04-saved script
@@ -8,7 +8,7 @@
     const doneList = document.querySelector("#doneList");
     const seedButton = document.querySelector("#seedButton");
 
-    let tasks = [];
+    let tasks = loadTasks();
 
     const now = new Date();
     document.querySelector("#today").textContent = [
@@ -44,6 +44,15 @@
       saveAndRender();
     });
 
+    function loadTasks() {
+      try {
+        const data = JSON.parse(localStorage.getItem(storageKey));
+        return Array.isArray(data) ? data.filter(t => t && typeof t.id === 'string' && typeof t.title === 'string' && typeof t.done === 'boolean').map(t=>({...t,priority:['높음','보통','낮음'].includes(t.priority)?t.priority:'보통',createdAt:Number.isNaN(Date.parse(t.createdAt))?new Date().toISOString():t.createdAt})) : [];
+      } catch {
+        return [];
+      }
+    }
+
     function createSampleTasks() {
       return [
         { id: crypto.randomUUID(), title: "바이브코딩 뜻 글 제목 후보 정리", priority: "높음", done: false, createdAt: new Date().toISOString() },
@@ -53,6 +62,8 @@
     }
 
     function saveAndRender() {
+      try {localStorage.setItem(storageKey, JSON.stringify(tasks));document.querySelector('#storageMessage').textContent='';}
+      catch {document.querySelector('#storageMessage').textContent='이 브라우저에서는 저장할 수 없어 새로고침하면 사라집니다.';}
       render();
     }