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src/views/InstructorView.js

@@ -383,24 +383,30 @@ export function setupInstructorEvents() {
         } catch (error) {
             console.error(error);
             let msg = error.message;
+            let showRedirectBtn = false;
+
             if (error.code === 'auth/popup-blocked' || error.code === 'auth/popup-closed-by-user') {
-                msg = "瀏覽器攔截了登入視窗，或視窗被提前關閉。";
-                // Show Redirect Option
-                if (confirm("視窗無法正常開啟。是否改用頁面跳轉方式登入？\n(將會重新整理頁面)")) {
-                    try {
-                        await signInWithGoogleRedirect();
-                    } catch (err) {
-                        alert("跳轉失敗: " + err.message);
-                    }
-                    return;
-                }
+                msg = "登入視窗未正常開啟 (可能是瀏覽器攔截)。";
+                showRedirectBtn = true;
             }
             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.innerHTML = `
+                ${msg}
+                ${showRedirectBtn ? '<br><button id="redirect-login-btn" class="mt-2 bg-cyan-600 hover:bg-cyan-500 text-white px-3 py-1 rounded text-xs transition-colors">改用頁面跳轉登入</button>' : ''}
+            `;
             authErrorMsg.classList.remove('hidden');
+
+            // Attach listener if button exists
+            const retryBtn = document.getElementById('redirect-login-btn');
+            if (retryBtn) {
+                retryBtn.addEventListener('click', () => {
+                    signInWithGoogleRedirect().catch(e => alert("跳轉失敗: " + e.message));
+                });
+            }
+
         } finally {
             authBtn.disabled = false;
             authBtn.classList.remove('opacity-50');