diff --git a/my-blog/static/js/ask-ai.js b/my-blog/static/js/ask-ai.js
index ab84092..824a3b4 100644
--- a/my-blog/static/js/ask-ai.js
+++ b/my-blog/static/js/ask-ai.js
@@ -253,6 +253,24 @@ function setupAskAIEventListeners() {
         handleAIResponse(event.detail);
     });
     
+    // Listen for OAuth callback completion from iframe
+    window.addEventListener('message', function(event) {
+        if (event.data.type === 'oauth_success') {
+            console.log('Received OAuth success message:', event.data);
+            
+            // Close any OAuth popups/iframes
+            const oauthFrame = document.getElementById('oauth-frame');
+            if (oauthFrame) {
+                oauthFrame.remove();
+            }
+            
+            // Reload the page to refresh OAuth app state
+            setTimeout(() => {
+                window.location.reload();
+            }, 500);
+        }
+    });
+    
     // Track IME composition state
     let isComposing = false;
     const aiQuestionInput = document.getElementById('aiQuestion');
@@ -284,52 +302,8 @@ function setupAskAIEventListeners() {
     });
 }
 
-// OAuth Callback handling
-function handleOAuthCallback() {
-    // Check if we're on the callback page
-    if (window.location.pathname === '/oauth/callback') {
-        const urlParams = new URLSearchParams(window.location.search);
-        const code = urlParams.get('code');
-        const error = urlParams.get('error');
-        
-        if (error) {
-            console.error('OAuth error:', error);
-            // Redirect to home page with error
-            setTimeout(() => {
-                window.location.href = '/?oauth_error=' + encodeURIComponent(error);
-            }, 1000);
-            return;
-        }
-        
-        if (code) {
-            console.log('OAuth callback successful, code received');
-            
-            // Get the original page from localStorage or use home page
-            const originalPage = localStorage.getItem('oauth_original_page') || '/';
-            localStorage.removeItem('oauth_original_page');
-            
-            // Wait a bit for OAuth app to process the callback
-            setTimeout(() => {
-                console.log('Redirecting back to:', originalPage);
-                window.location.href = originalPage;
-            }, 2000);
-            
-            return;
-        }
-    }
-    
-    // Store current page before OAuth if we're not on callback page
-    if (window.location.pathname !== '/oauth/callback') {
-        localStorage.setItem('oauth_original_page', window.location.href);
-    }
-}
-
 // Initialize Ask AI when DOM is loaded
 document.addEventListener('DOMContentLoaded', function() {
-    // Handle OAuth callback first
-    handleOAuthCallback();
-    
-    // Then initialize Ask AI
     setupAskAIEventListeners();
     console.log('Ask AI initialized successfully');
 });
diff --git a/oauth/src/App.css b/oauth/src/App.css
index cbe6bfe..63f6085 100644
--- a/oauth/src/App.css
+++ b/oauth/src/App.css
@@ -44,7 +44,7 @@ body {
 
 .oauth-header-content {
   display: flex;
-  justify-content: flex-start;
+  justify-content: space-between;
   align-items: center;
   max-width: 800px;
   margin: 0 auto;
@@ -62,7 +62,74 @@ body {
   display: flex;
   gap: 8px;
   align-items: center;
-  width: 100%;
+}
+
+/* OAuth User Profile in Header */
+.oauth-user-profile {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  flex: 1;
+}
+
+.profile-avatar-section {
+  flex-shrink: 0;
+}
+
+.profile-avatar-section .profile-avatar {
+  width: 48px;
+  height: 48px;
+  border-radius: 50%;
+  object-fit: cover;
+  border: 2px solid var(--border);
+}
+
+.profile-avatar-fallback {
+  width: 48px;
+  height: 48px;
+  border-radius: 50%;
+  background: var(--background-secondary);
+  border: 2px solid var(--border);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 18px;
+  font-weight: 700;
+  color: var(--text-secondary);
+}
+
+.profile-info {
+  flex: 1;
+  min-width: 0;
+}
+
+.profile-display-name {
+  font-size: 18px;
+  font-weight: 700;
+  color: var(--text);
+  margin-bottom: 2px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.profile-handle {
+  font-size: 14px;
+  color: var(--text-secondary);
+  margin-bottom: 2px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.profile-did {
+  font-size: 11px;
+  color: var(--text-secondary);
+  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  opacity: 0.7;
 }
 
 /* Buttons */
@@ -647,6 +714,41 @@ body {
   .chat-container {
     height: 300px;
   }
+  
+  /* OAuth User Profile Mobile */
+  .oauth-user-profile {
+    gap: 8px;
+  }
+  
+  .profile-avatar-section .profile-avatar,
+  .profile-avatar-fallback {
+    width: 36px;
+    height: 36px;
+    font-size: 14px;
+  }
+  
+  .profile-display-name {
+    font-size: 14px;
+  }
+  
+  .profile-handle {
+    font-size: 12px;
+  }
+  
+  .profile-did {
+    font-size: 9px;
+  }
+  
+  .oauth-header-content {
+    flex-direction: column;
+    gap: 12px;
+    align-items: flex-start;
+  }
+  
+  .oauth-header-actions {
+    width: 100%;
+    justify-content: center;
+  }
 }
 
 /* Avatar Styles */
diff --git a/oauth/src/App.jsx b/oauth/src/App.jsx
index 9ab8d20..11fac13 100644
--- a/oauth/src/App.jsx
+++ b/oauth/src/App.jsx
@@ -69,8 +69,32 @@ export default function App() {
 
   if (isLoading) {
     return (
-      <div style={{ padding: '20px', textAlign: 'center' }}>
-        <p>読み込み中...</p>
+      <div style={{ 
+        display: 'flex', 
+        flexDirection: 'column',
+        alignItems: 'center', 
+        justifyContent: 'center',
+        minHeight: '200px',
+        padding: '40px',
+        textAlign: 'center' 
+      }}>
+        <div style={{
+          width: '40px',
+          height: '40px',
+          border: '4px solid #f3f3f3',
+          borderTop: '4px solid #667eea',
+          borderRadius: '50%',
+          animation: 'spin 1s linear infinite',
+          marginBottom: '16px'
+        }} />
+        <p style={{ color: '#666', margin: 0 }}>読み込み中...</p>
+        
+        <style jsx>{`
+          @keyframes spin {
+            0% { transform: rotate(0deg); }
+            100% { transform: rotate(360deg); }
+          }
+        `}</style>
       </div>
     )
   }
@@ -115,6 +139,34 @@ export default function App() {
     <div className="app">
       <header className="oauth-app-header">
         <div className="oauth-header-content">
+          {user && (
+            <div className="oauth-user-profile">
+              <div className="profile-avatar-section">
+                {user.avatar ? (
+                  <img 
+                    src={user.avatar} 
+                    alt={user.displayName || user.handle} 
+                    className="profile-avatar"
+                  />
+                ) : (
+                  <div className="profile-avatar-fallback">
+                    {(user.displayName || user.handle || '?').charAt(0).toUpperCase()}
+                  </div>
+                )}
+              </div>
+              <div className="profile-info">
+                <div className="profile-display-name">
+                  {user.displayName || user.handle}
+                </div>
+                <div className="profile-handle">
+                  @{user.handle}
+                </div>
+                <div className="profile-did">
+                  {user.did}
+                </div>
+              </div>
+            </div>
+          )}
           <div className="oauth-header-actions">
             <AuthButton 
               user={user} 
diff --git a/oauth/src/components/OAuthCallback.jsx b/oauth/src/components/OAuthCallback.jsx
index 0b7b0ed..bcab2e6 100644
--- a/oauth/src/components/OAuthCallback.jsx
+++ b/oauth/src/components/OAuthCallback.jsx
@@ -1,54 +1,36 @@
-import React, { useEffect, useState } from 'react'
-
-export default function OAuthCallback({ onAuthSuccess }) {
-  const [status, setStatus] = useState('OAuth認証処理中...')
-
-  useEffect(() => {
-    handleCallback()
-  }, [])
-
-  const handleCallback = async () => {
-    try {
-      // BrowserOAuthClientが自動的にコールバックを処理します
-      // URLのパラメータを確認して成功を通知
-      const urlParams = new URLSearchParams(window.location.search)
-      const code = urlParams.get('code')
-      const error = urlParams.get('error')
-
-      if (error) {
-        throw new Error(`OAuth error: ${error}`)
-      }
-
-      if (code) {
-        setStatus('認証成功！元のページに戻ります...')
-        
-        // Get the referring page or use root
-        const referrer = document.referrer || window.location.origin
-        const returnUrl = referrer.includes('/oauth/callback') ? window.location.origin : referrer
-        
-        // 少し待ってから元のページにリダイレクト
-        setTimeout(() => {
-          window.location.href = returnUrl
-        }, 1500)
-      } else {
-        setStatus('認証情報が見つかりません')
-      }
-
-    } catch (error) {
-      console.error('Callback error:', error)
-      setStatus('認証エラー: ' + error.message)
-    }
-  }
+import React from 'react'
 
+export default function OAuthCallback() {
   return (
-    <div style={{ padding: '20px', textAlign: 'center' }}>
-      <h2>OAuth認証</h2>
-      <p>{status}</p>
-      {status.includes('エラー') && (
-        <button onClick={() => window.location.href = '/'}>
-          メインページに戻る
-        </button>
-      )}
+    <div style={{ 
+      display: 'flex', 
+      flexDirection: 'column',
+      alignItems: 'center', 
+      justifyContent: 'center',
+      minHeight: '50vh',
+      padding: '40px',
+      textAlign: 'center' 
+    }}>
+      <div style={{
+        width: '50px',
+        height: '50px',
+        border: '4px solid #f3f3f3',
+        borderTop: '4px solid #667eea',
+        borderRadius: '50%',
+        animation: 'spin 1s linear infinite',
+        marginBottom: '20px'
+      }} />
+      <h2 style={{ color: '#333', marginBottom: '12px' }}>OAuth認証処理中...</h2>
+      <p style={{ color: '#666', fontSize: '14px' }}>
+        認証が完了しましたら自動で元のページに戻ります
+      </p>
+      
+      <style jsx>{`
+        @keyframes spin {
+          0% { transform: rotate(0deg); }
+          100% { transform: rotate(360deg); }
+        }
+      `}</style>
     </div>
   )
 }
\ No newline at end of file
diff --git a/oauth/src/hooks/useAuth.js b/oauth/src/hooks/useAuth.js
index 63a5b3c..2d3eca5 100644
--- a/oauth/src/hooks/useAuth.js
+++ b/oauth/src/hooks/useAuth.js
@@ -18,6 +18,32 @@ export function useAuth() {
       if (authResult) {
         setUser(authResult.user)
         setAgent(authResult.agent)
+        
+        // If we're on callback page and authentication succeeded, notify parent
+        if (window.location.pathname === '/oauth/callback') {
+          console.log('OAuth callback completed, notifying parent window')
+          
+          // Get referrer or use stored return URL
+          const returnUrl = sessionStorage.getItem('oauth_return_url') || 
+                          document.referrer || 
+                          window.location.origin
+          
+          sessionStorage.removeItem('oauth_return_url')
+          
+          // Notify parent window if in iframe, otherwise redirect directly
+          if (window.parent !== window) {
+            window.parent.postMessage({
+              type: 'oauth_success',
+              returnUrl: returnUrl,
+              user: authResult.user
+            }, '*')
+          } else {
+            // Direct redirect
+            setTimeout(() => {
+              window.location.href = returnUrl
+            }, 1000)
+          }
+        }
       }
     } catch (error) {
       console.error('Auth initialization failed:', error)
@@ -27,6 +53,11 @@ export function useAuth() {
   }
 
   const login = async (handle) => {
+    // Store current page URL for post-auth redirect
+    if (window.location.pathname !== '/oauth/callback') {
+      sessionStorage.setItem('oauth_return_url', window.location.href)
+    }
+    
     await oauthService.login(handle)
   }
 
diff --git a/oauth/src/services/oauth.js b/oauth/src/services/oauth.js
index 2cff4ac..239fe7d 100644
--- a/oauth/src/services/oauth.js
+++ b/oauth/src/services/oauth.js
@@ -65,6 +65,8 @@ export class OAuthService {
   async processSession(session) {
     const did = session.sub || session.did
     let handle = session.handle || 'unknown'
+    let displayName = null
+    let avatar = null
 
     // Create Agent directly with session (per official docs)
     try {
@@ -77,21 +79,40 @@ export class OAuthService {
       })
     }
 
-    this.sessionInfo = { did, handle }
-
-    // Resolve handle if missing
-    if (handle === 'unknown' && this.agent) {
+    // Get profile information using authenticated agent
+    if (this.agent) {
       try {
         await new Promise(resolve => setTimeout(resolve, 300))
         const profile = await this.agent.getProfile({ actor: did })
-        handle = profile.data.handle
-        this.sessionInfo.handle = handle
+        handle = profile.data.handle || handle
+        displayName = profile.data.displayName || null
+        avatar = profile.data.avatar || null
+        
+        console.log('Profile fetched from session:', {
+          did,
+          handle,
+          displayName,
+          avatar: avatar ? 'present' : 'none'
+        })
       } catch (error) {
-        console.log('Failed to resolve handle:', error)
+        console.log('Failed to get profile from session:', error)
+        // Keep the basic info we have
       }
     }
 
-    return { did, handle }
+    this.sessionInfo = { 
+      did, 
+      handle, 
+      displayName, 
+      avatar 
+    }
+
+    return { 
+      did, 
+      handle, 
+      displayName, 
+      avatar 
+    }
   }
 
   async login(handle) {