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src/views/InstructorView.js

@@ -362,8 +362,10 @@ export function setupInstructorEvents() {
     // Google Auth Logic
     authBtn.addEventListener('click', async () => {
         try {
-            authBtn.disabled = true;
+            // Do NOT disable button immediately to prevent browser popup blocker
+            // authBtn.disabled = true; 
             authBtn.classList.add('opacity-50');
+            authErrorMsg.classList.add('hidden');
 
             const user = await signInWithGoogle();
             const instructorData = await checkInstructorPermission(user);
@@ -380,7 +382,16 @@ export function setupInstructorEvents() {
             }
         } catch (error) {
             console.error(error);
-            authErrorMsg.textContent = "登入失敗: " + error.message;
+            let msg = error.message;
+            if (error.code === 'auth/popup-blocked') {
+                msg = "瀏覽器攔截了登入視窗。請允許此網站的彈出視窗，或不要在點擊後移動滑鼠。";
+                alert(msg);
+            }
+            if (error.code === 'auth/operation-not-allowed' || error.message.includes('invalid')) {
+                msg = "Google 登入功能未啟用。請前往 Firebase Console > Authentication開啟 Google Sign-In。";
+                alert(msg);
+            }
+            authErrorMsg.textContent = "登入失敗: " + msg;
             authErrorMsg.classList.remove('hidden');
         } finally {
             authBtn.disabled = false;