diff --git a/public/css/style.css b/public/css/style.css
index a6e8646..3ba0492 100644
--- a/public/css/style.css
+++ b/public/css/style.css
@@ -240,23 +240,61 @@ header p {
 }
 
 .top-banner {
-    background: rgba(255, 255, 255, 0.08);
+    background: rgba(255, 255, 255, 0.7);
     border: 1px solid var(--panel-border);
     border-radius: 16px;
     padding: 1rem 1.25rem;
     margin-bottom: 1.5rem;
     color: var(--text-primary);
-    font-size: 1.25rem;
-    font-weight: 700;
     display: flex;
     align-items: center;
-    justify-content: flex-start;
+    justify-content: space-between;
+    gap: 1rem;
+    backdrop-filter: blur(16px);
+    -webkit-backdrop-filter: blur(16px);
 }
 
 .top-banner.hidden {
     display: none;
 }
 
+.top-banner__title {
+    font-size: 1.25rem;
+    font-weight: 700;
+    min-width: 0;
+}
+
+.top-banner__actions {
+    display: flex;
+    align-items: center;
+    justify-content: flex-end;
+    gap: 0.75rem;
+    flex-wrap: wrap;
+}
+
+.user-chip {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.5rem;
+    padding: 0.65rem 0.9rem;
+    border-radius: 999px;
+    background: rgba(37, 99, 235, 0.08);
+    border: 1px solid rgba(37, 99, 235, 0.16);
+    color: var(--text-primary);
+    line-height: 1;
+}
+
+.user-chip__label {
+    color: var(--text-secondary);
+    font-size: 0.82rem;
+    font-weight: 600;
+}
+
+.user-chip__name {
+    font-size: 0.92rem;
+    font-weight: 700;
+}
+
 .section-header {
     display: block;
     margin-bottom: 0.75rem;
@@ -291,6 +329,16 @@ header p {
     transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
 }
 
+.action-btn-secondary {
+    background: #0f172a;
+    color: #ffffff;
+}
+
+.action-btn-secondary:hover {
+    background: #1e293b;
+    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.16);
+}
+
 .action-btn:hover {
     background: #1d4ed8;
     transform: translateY(-1px);
@@ -1044,6 +1092,16 @@ header p {
 
 /* Responsive adjustments */
 @media (max-width: 900px) {
+    .top-banner {
+        align-items: flex-start;
+        flex-direction: column;
+    }
+
+    .top-banner__actions {
+        width: 100%;
+        justify-content: space-between;
+    }
+
     .dashboard {
         grid-template-columns: 1fr;
     }
diff --git a/public/index.html b/public/index.html
index 7f72e6d..c222a46 100644
--- a/public/index.html
+++ b/public/index.html
@@ -34,7 +34,16 @@
     </div>
 
     <div class="container hidden" id="app-container">
-        <div id="top-banner" class="top-banner hidden"></div>
+        <div id="top-banner" class="top-banner hidden">
+            <div class="top-banner__title" id="top-banner-title"></div>
+            <div class="top-banner__actions">
+                <div class="user-chip" id="user-chip">
+                    <span class="user-chip__label">当前用户</span>
+                    <span class="user-chip__name" id="current-username">-</span>
+                </div>
+                <button id="logout-btn" class="action-btn action-btn-secondary" type="button">退出登录</button>
+            </div>
+        </div>
 
         <main class="dashboard">
             <section class="video-list-section glass-panel">
diff --git a/public/js/main.js b/public/js/main.js
index bba2303..b2225d0 100644
--- a/public/js/main.js
+++ b/public/js/main.js
@@ -22,6 +22,9 @@ document.addEventListener('DOMContentLoaded', () => {
     const stopTranscodeBtn = document.getElementById('stop-transcode-btn');
     const playBtn = document.getElementById('play-btn');
     const topBanner = document.getElementById('top-banner');
+    const topBannerTitle = document.getElementById('top-banner-title');
+    const currentUsername = document.getElementById('current-username');
+    const logoutBtn = document.getElementById('logout-btn');
     const customControls = document.getElementById('custom-controls');
     const controlPlayToggle = document.getElementById('control-play-toggle');
     const controlMuteToggle = document.getElementById('control-mute-toggle');
@@ -71,6 +74,7 @@ document.addEventListener('DOMContentLoaded', () => {
     let currentVideoKey = null;
     let s3Username = '';
     let s3Password = '';
+    let authenticatedUsername = '';
     let s3AuthHeaders = {};
     const LEGACY_AUTH_STORAGE_KEY = 'media-coding-web:s3-auth';
     const SAVED_BUCKET_STORAGE_KEY = 'media-coding-web:selected-bucket';
@@ -723,13 +727,13 @@ document.addEventListener('DOMContentLoaded', () => {
     // --- End custom seek bar ---
 
     const loadConfig = async () => {
-        if (!topBanner) return;
+        if (!topBanner || !topBannerTitle) return;
         try {
             const res = await fetch('/api/config');
             if (!res.ok) throw new Error('Failed to load config');
             const data = await res.json();
             const title = data.title || 'S3 Media Transcoder';
-            topBanner.textContent = title;
+            topBannerTitle.textContent = title;
             topBanner.classList.remove('hidden');
             document.title = title;
             populateSelect(encoderSelect, data.videoEncoders || [], data.defaultVideoEncoder || 'h264_rkmpp');
@@ -800,11 +804,20 @@ document.addEventListener('DOMContentLoaded', () => {
     const showLogin = () => {
         if (loginScreen) loginScreen.classList.remove('hidden');
         if (appContainer) appContainer.classList.add('hidden');
+        if (topBanner) topBanner.classList.add('hidden');
     };
 
     const showApp = () => {
         if (loginScreen) loginScreen.classList.add('hidden');
         if (appContainer) appContainer.classList.remove('hidden');
+        if (topBanner) topBanner.classList.remove('hidden');
+    };
+
+    const updateAuthenticatedUser = (username) => {
+        authenticatedUsername = typeof username === 'string' ? username.trim() : '';
+        if (currentUsername) {
+            currentUsername.textContent = authenticatedUsername || '-';
+        }
     };
 
     const renderBuckets = (buckets) => {
@@ -830,11 +843,62 @@ document.addEventListener('DOMContentLoaded', () => {
         loginError.classList.add('hidden');
     };
 
-    const applyAuthenticatedState = async (buckets) => {
+    const resetAuthenticatedState = () => {
+        stopPolling();
+        selectedBucket = null;
+        selectedKey = null;
+        currentVideoKey = null;
+        subscribedKey = null;
+        setAuthHeaders('', '');
+        saveSelectedBucket('');
+        updateAuthenticatedUser('');
+        clearLoginError();
+
+        if (bucketSelect) {
+            bucketSelect.innerHTML = '<option value="" disabled selected>Choose a bucket</option>';
+        }
+        if (videoListEl) {
+            videoListEl.innerHTML = '';
+            videoListEl.classList.add('hidden');
+        }
+        if (loadingSpinner) {
+            loadingSpinner.classList.remove('hidden');
+            loadingSpinner.innerHTML = `
+                <div class="spinner"></div>
+                <p>Fetching S3 Objects...</p>
+            `;
+        }
+        if (nowPlaying) nowPlaying.classList.add('hidden');
+        if (currentVideoTitle) currentVideoTitle.textContent = 'video.mp4';
+        if (loginPasswordInput) loginPasswordInput.value = '';
+        if (transcodingOverlay) transcodingOverlay.classList.add('hidden');
+        if (playerOverlay) playerOverlay.classList.remove('hidden');
+        if (videoPlayer) {
+            videoPlayer.pause();
+            videoPlayer.removeAttribute('src');
+            videoPlayer.load();
+            videoPlayer.classList.add('hidden');
+        }
+        isStreamActive = false;
+        videoDuration = 0;
+        seekOffset = 0;
+        if (seekCurrentTime) seekCurrentTime.textContent = formatTime(0);
+        if (seekTotalTime) seekTotalTime.textContent = formatTime(0);
+        hideSeekBar();
+        hideCustomControls();
+        resetPhases();
+        resetSubtitleTracks();
+        setPlaybackStatus('Paused', 'paused');
+        updatePlayControls();
+        updateVolumeControls();
+    };
+
+    const applyAuthenticatedState = async (buckets, username = '') => {
         if (!Array.isArray(buckets) || buckets.length === 0) {
             throw new Error('No buckets available for this account');
         }
 
+        updateAuthenticatedUser(username);
         renderBuckets(buckets);
         showApp();
         const savedBucket = loadSelectedBucket();
@@ -851,6 +915,33 @@ document.addEventListener('DOMContentLoaded', () => {
         await fetchVideos(selectedBucket);
     };
 
+    const logout = async () => {
+        if (logoutBtn) {
+            logoutBtn.disabled = true;
+            logoutBtn.textContent = '退出中...';
+        }
+
+        try {
+            const res = await fetch('/api/logout', { method: 'POST' });
+            if (!res.ok) {
+                const data = await res.json().catch(() => ({}));
+                throw new Error(data.error || 'Logout failed');
+            }
+        } catch (error) {
+            console.error('Logout failed:', error);
+            alert(`退出登录失败: ${error.message}`);
+            return;
+        } finally {
+            if (logoutBtn) {
+                logoutBtn.disabled = false;
+                logoutBtn.textContent = '退出登录';
+            }
+        }
+
+        resetAuthenticatedState();
+        showLogin();
+    };
+
     const login = async (options = {}) => {
         if (!loginUsernameInput || !loginPasswordInput) return false;
         const username = typeof options.username === 'string' ? options.username.trim() : loginUsernameInput.value.trim();
@@ -876,7 +967,7 @@ document.addEventListener('DOMContentLoaded', () => {
             const data = await res.json();
             if (loginUsernameInput) loginUsernameInput.value = username;
             if (loginPasswordInput) loginPasswordInput.value = '';
-            await applyAuthenticatedState(data.buckets);
+            await applyAuthenticatedState(data.buckets, data.username || username);
             return true;
         } catch (err) {
             console.error('Login error:', err);
@@ -900,7 +991,7 @@ document.addEventListener('DOMContentLoaded', () => {
                 return false;
             }
             const data = await res.json();
-            await applyAuthenticatedState(data.buckets || []);
+            await applyAuthenticatedState(data.buckets || [], data.username || '');
             return true;
         } catch (error) {
             console.error('Session restore failed:', error);
@@ -1344,6 +1435,9 @@ document.addEventListener('DOMContentLoaded', () => {
     if (loginBtn) {
         loginBtn.addEventListener('click', login);
     }
+    if (logoutBtn) {
+        logoutBtn.addEventListener('click', logout);
+    }
     if (bucketSelect) {
         bucketSelect.addEventListener('change', async (event) => {
             selectedBucket = event.target.value;
diff --git a/server.js b/server.js
index b894530..187948f 100644
--- a/server.js
+++ b/server.js
@@ -195,6 +195,16 @@ const createValkeySession = async (res, credentials) => {
     return sessionId;
 };
 
+const destroyValkeySession = async (req, res) => {
+    const cookies = parseCookieHeader(req.headers.cookie || '');
+    const sessionId = cookies[SESSION_COOKIE_NAME];
+    if (sessionId && valkeyEnabled && valkeyClient) {
+        await valkeyClient.del(getSessionStorageKey(sessionId));
+        console.log(`[auth] session cleared sessionId=${sessionId}`);
+    }
+    clearSessionCookie(res);
+};
+
 const loadValkeySession = async (req) => {
     if (!valkeyEnabled || !valkeyClient) {
         return null;
@@ -602,7 +612,7 @@ app.get('/api/buckets', async (req, res) => {
             await createValkeySession(res, auth);
         }
         console.log(`[s3] list buckets complete count=${buckets.length}`);
-        res.json({ buckets });
+        res.json({ buckets, username: auth.username || '' });
     } catch (error) {
         if (auth?.source === 'session') {
             clearSessionCookie(res);
@@ -612,6 +622,16 @@ app.get('/api/buckets', async (req, res) => {
     }
 });
 
+app.post('/api/logout', async (req, res) => {
+    try {
+        await destroyValkeySession(req, res);
+        res.json({ ok: true });
+    } catch (error) {
+        console.error('[auth] logout failed:', error);
+        res.status(500).json({ error: 'Failed to logout', detail: error.message });
+    }
+});
+
 // Endpoint to list videos in the bucket
 app.get('/api/videos', async (req, res) => {
     try {