diff --git a/frontend/index.html b/frontend/index.html
index 5be239e..c9b08bb 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -54,6 +54,14 @@
             </footer>
         </aside>
 
+        <div id="sidebar-overlay" class="sidebar-overlay hidden"></div>
+
+        <button id="menu-toggle" class="menu-toggle" aria-label="Toggle Menu">
+            <span class="bar"></span>
+            <span class="bar"></span>
+            <span class="bar"></span>
+        </button>
+
         <main class="main-content">
             <div id="empty-state" class="empty-state hidden">
                 <div class="empty-icon">⌘</div>
diff --git a/frontend/src/main.js b/frontend/src/main.js
index 91e3ffd..edf3959 100644
--- a/frontend/src/main.js
+++ b/frontend/src/main.js
@@ -60,6 +60,9 @@ const chatForm = document.getElementById('chat-form');
 const chatInput = document.getElementById('chat-input');
 const clearChatBtn = document.getElementById('clear-chat-btn');
 const chatSendBtn = document.getElementById('chat-send-btn');
+const sidebarEl = document.querySelector('.sidebar');
+const menuToggle = document.getElementById('menu-toggle');
+const sidebarOverlay = document.getElementById('sidebar-overlay');
 
 function updateState(newState) {
     Object.assign(state, newState);
@@ -240,6 +243,11 @@ function selectTask(id, runId = null) {
     renderTaskList();
     renderRunHistory(task);
     showTaskView(task);
+
+    // Close sidebar on mobile after selection
+    if (window.innerWidth <= 768) {
+        closeMobileMenu();
+    }
 }
 
 function renderRunHistory(task) {
@@ -753,6 +761,23 @@ document.querySelectorAll('.tab-btn').forEach(btn => {
     });
 });
 
+function toggleMobileMenu() {
+    sidebarEl.classList.toggle('open');
+    menuToggle.classList.toggle('active');
+    sidebarOverlay.classList.toggle('hidden');
+    document.body.style.overflow = sidebarEl.classList.contains('open') ? 'hidden' : '';
+}
+
+function closeMobileMenu() {
+    sidebarEl.classList.remove('open');
+    menuToggle.classList.remove('active');
+    sidebarOverlay.classList.add('hidden');
+    document.body.style.overflow = '';
+}
+
+menuToggle.addEventListener('click', toggleMobileMenu);
+sidebarOverlay.addEventListener('click', closeMobileMenu);
+
 async function initializeApp() {
     const hasSession = await checkSession();
 
diff --git a/frontend/src/style.css b/frontend/src/style.css
index f34da31..048ad46 100644
--- a/frontend/src/style.css
+++ b/frontend/src/style.css
@@ -1043,4 +1043,146 @@ textarea:focus {
 
 .logout-btn:hover {
   color: var(--primary);
+}
+
+/* Mobile Menu Toggle */
+.menu-toggle {
+  display: none;
+  position: fixed;
+  top: 16px;
+  right: 16px;
+  z-index: 1100;
+  background: var(--primary);
+  border: none;
+  width: 44px;
+  height: 44px;
+  border-radius: 10px;
+  cursor: pointer;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+  gap: 5px;
+  box-shadow: 0 4px 15px var(--primary-glow);
+  transition: var(--transition);
+}
+
+.menu-toggle .bar {
+  display: block;
+  width: 20px;
+  height: 2px;
+  background: white;
+  border-radius: 2px;
+  transition: var(--transition);
+}
+
+.menu-toggle.active .bar:nth-child(1) {
+  transform: translateY(7px) rotate(45deg);
+}
+
+.menu-toggle.active .bar:nth-child(2) {
+  opacity: 0;
+}
+
+.menu-toggle.active .bar:nth-child(3) {
+  transform: translateY(-7px) rotate(-45deg);
+}
+
+.sidebar-overlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  background: rgba(0, 0, 0, 0.5);
+  backdrop-filter: blur(4px);
+  z-index: 1000;
+  transition: opacity 0.3s ease;
+}
+
+/* Responsive Styles */
+@media (max-width: 768px) {
+  .menu-toggle {
+    display: flex;
+  }
+
+  .sidebar {
+    position: fixed;
+    left: -320px;
+    top: 0;
+    height: 100%;
+    z-index: 1050;
+    transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+    box-shadow: 10px 0 30px rgba(0, 0, 0, 0.5);
+  }
+
+  .sidebar.open {
+    left: 0;
+  }
+
+  .dashboard-view, .task-view {
+    padding: 20px;
+    padding-top: 80px; /* Space for menu button */
+    height: auto;
+    min-height: 100%;
+    overflow-y: auto;
+  }
+
+  .dashboard-header h2 {
+    font-size: 24px;
+  }
+
+  .task-content {
+    flex-direction: column;
+    height: auto;
+    overflow: visible;
+  }
+
+  .run-history {
+    width: 100%;
+    max-height: 200px;
+    flex-shrink: 0;
+  }
+
+  .run-details {
+    flex-direction: column;
+    height: auto;
+    overflow: visible;
+    gap: 16px;
+  }
+
+  .logs-container {
+    width: 100%;
+    height: 400px;
+    flex-shrink: 0;
+  }
+
+  .view-header {
+    flex-direction: column;
+    align-items: flex-start;
+    gap: 16px;
+  }
+
+  .header-actions {
+    width: 100%;
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    gap: 8px;
+  }
+
+  .header-actions .btn {
+    justify-content: center;
+  }
+
+  .modal {
+    width: 95%;
+    padding: 20px;
+  }
+
+  .preset-group {
+    grid-template-columns: 1fr;
+  }
+
+  .chat-container {
+    height: 500px;
+  }
 }
\ No newline at end of file