diff --git a/frontend/src/components/Layout.tsx b/frontend/src/components/Layout.tsx
index f075af9..5271ef7 100644
--- a/frontend/src/components/Layout.tsx
+++ b/frontend/src/components/Layout.tsx
@@ -1,5 +1,6 @@
-import { NavLink } from 'react-router-dom'
-import { Wrench, ClipboardList, History, Boxes, HardHat, Repeat, MapPin, Settings } from 'lucide-react'
+import { useState, useEffect } from 'react'
+import { NavLink, useLocation } from 'react-router-dom'
+import { Wrench, ClipboardList, History, Boxes, HardHat, Repeat, MapPin, Settings, Menu } from 'lucide-react'
 import { useAuth } from './AuthGate'
 import { can } from '../types'
 
@@ -18,9 +19,13 @@ const NAV = [
 export default function Layout({ children }: { children: React.ReactNode }) {
   const { user } = useAuth()
   const items = NAV.filter(n => can(user, n.cap))
+  const location = useLocation()
+  const [menuOpen, setMenuOpen] = useState(false)
+
+  useEffect(() => { setMenuOpen(false) }, [location.pathname])
 
   return (
-    <div className="app-shell">
+    <div className={`app-shell${menuOpen ? ' menu-open' : ''}`}>
       <aside className="sidebar">
         <div className="sidebar-logo">
           <Wrench size={18} strokeWidth={1.75} />
@@ -37,16 +42,14 @@ export default function Layout({ children }: { children: React.ReactNode }) {
         <div className="sidebar-user">{user.name}</div>
       </aside>
 
+      {menuOpen && <div className="menu-backdrop" onClick={() => setMenuOpen(false)} />}
+
       <header className="top-bar">
+        <button className="top-bar-burger" onClick={() => setMenuOpen(o => !o)}>
+          <Menu size={20} strokeWidth={1.75} />
+        </button>
         <Wrench size={18} strokeWidth={1.75} color="var(--gold)" />
         <span className="top-bar-title">Maintenance</span>
-        <nav className="top-bar-nav">
-          {items.map(({ to, label }) => (
-            <NavLink key={to} to={to} className={({ isActive }) => isActive ? 'active' : ''}>
-              {label}
-            </NavLink>
-          ))}
-        </nav>
       </header>
 
       <main className="page-content">
diff --git a/frontend/src/index.css b/frontend/src/index.css
index 388a5ff..dcbf353 100644
--- a/frontend/src/index.css
+++ b/frontend/src/index.css
@@ -124,9 +124,35 @@ html, body, #root { height: 100%; margin: 0; font-size: 14px; }
 .page-content { flex: 1; overflow-y: auto; display: flex; flex-direction: column; }
 
 @media (max-width: 768px) {
-  .sidebar { display: none; }
+  .sidebar {
+    position: fixed;
+    top: 0; left: 0; bottom: 0;
+    z-index: 200;
+    transform: translateX(calc(-1 * var(--sidebar-w)));
+    transition: transform 0.25s ease;
+  }
+  .app-shell.menu-open .sidebar { transform: translateX(0); }
   .top-bar { display: flex; }
   .app-shell { flex-direction: column; }
+  .field-row { flex-direction: column; }
+}
+
+.menu-backdrop {
+  position: fixed;
+  inset: 0;
+  background: rgba(0,0,0,0.5);
+  z-index: 199;
+}
+
+.top-bar-burger {
+  background: none;
+  border: none;
+  color: var(--text);
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  padding: 4px;
+  flex-shrink: 0;
 }
 
 /* ── Page chrome ───────────────────────────────────────────── */