diff --git a/src/psyc/cockpit/static/cockpit.css b/src/psyc/cockpit/static/cockpit.css
index 88a88d4..601dee3 100644
--- a/src/psyc/cockpit/static/cockpit.css
+++ b/src/psyc/cockpit/static/cockpit.css
@@ -809,17 +809,61 @@ body.wide .net-grid { grid-template-columns: repeat(auto-fill, minmax(320px, 1fr
 .feed-count { color: var(--accent); font-family: ui-monospace, Menlo, monospace; font-weight: 600; }
 .feed-time  { color: var(--muted); font-family: ui-monospace, Menlo, monospace; font-size: 11px; }
 
-/* ── mobile pass for the rest of the cockpit ────────────────── */
-@media (max-width: 720px) {
-  .topbar { flex-wrap: wrap; gap: 8px; padding: 8px 14px; }
+/* ── hamburger toggle (visible only on mobile) ──────────────── */
+.nav-toggle {
+  display: none;
+  background: transparent; border: 1px solid var(--border); border-radius: 6px;
+  width: 38px; height: 38px; padding: 0; cursor: pointer;
+  flex-direction: column; gap: 5px; align-items: center; justify-content: center;
+  transition: border-color 0.15s;
+}
+.nav-toggle:hover, .topbar.nav-open .nav-toggle { border-color: var(--accent); box-shadow: 0 0 10px var(--accent-glow); }
+.nav-toggle-bar {
+  display: block; width: 18px; height: 2px; background: var(--text); border-radius: 1px;
+  transition: transform 0.2s, opacity 0.2s;
+}
+.topbar.nav-open .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
+.topbar.nav-open .nav-toggle-bar:nth-child(2) { opacity: 0; }
+.topbar.nav-open .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
+
+/* ── mobile pass — proper drawer nav ────────────────────────── */
+@media (max-width: 760px) {
+  .topbar { flex-wrap: wrap; gap: 8px; padding: 8px 14px; align-items: center; }
   .brand-icon { height: 36px; width: 120px; }
-  .brand-sub { display: none; }
-  .nav { width: 100%; overflow-x: auto; white-space: nowrap; padding-bottom: 4px; }
-  .nav a { margin-left: 0; margin-right: 14px; font-size: 13px; }
-  .family-icon { height: 32px; }
-  .model-status, .admin-chip { font-size: 9.5px; padding-top: 2px; padding-bottom: 2px; }
+  .brand-sub  { display: none; }
+  .nav-toggle { display: inline-flex; order: 99; }
+
+  .nav {
+    order: 100; flex-basis: 100%;
+    display: none; flex-direction: column;
+    margin-top: 8px; padding: 6px 0;
+    border-top: 1px solid var(--border);
+  }
+  .topbar.nav-open .nav { display: flex; }
+  .nav a {
+    margin: 0; padding: 10px 4px;
+    font-size: 14px; color: var(--text);
+    border-bottom: 1px solid var(--border);
+  }
+  .nav a:last-child { border-bottom: none; }
+  .nav-admin {
+    border: none; background: transparent;
+    padding: 10px 4px; border-bottom: 1px solid var(--border);
+    border-radius: 0;
+  }
+
+  .family-icon { height: 30px; }
+  .model-status { font-size: 9.5px; padding: 2px 6px; }
+  .admin-chip   { font-size: 10px; }
+  .admin-chip-body, .admin-chip-lock { padding: 3px 7px; }
+
   .content { padding: 14px; }
-  .panel { padding: 14px; }
-  /* tables: let horizontal scroll handle wide columns */
+  .panel   { padding: 14px; }
   table.cases, table.ledger { display: block; overflow-x: auto; white-space: nowrap; }
 }
+
+@media (max-width: 420px) {
+  .family-icon  { display: none; }
+  .model-status { display: none; }
+  .brand-icon   { height: 32px; width: 100px; }
+}
diff --git a/src/psyc/cockpit/templates/base.html b/src/psyc/cockpit/templates/base.html
index 235791a..60ebb41 100644
--- a/src/psyc/cockpit/templates/base.html
+++ b/src/psyc/cockpit/templates/base.html
@@ -22,6 +22,21 @@
         navigator.serviceWorker.register("/sw.js", { scope: "/" }).catch(() => {});
       });
     }
+    // Mobile nav toggle. Topbar gets .nav-open; aria-expanded mirrors it.
+    document.addEventListener("DOMContentLoaded", () => {
+      const btn = document.querySelector(".nav-toggle");
+      const bar = document.querySelector(".topbar");
+      if (!btn || !bar) return;
+      btn.addEventListener("click", () => {
+        const open = bar.classList.toggle("nav-open");
+        btn.setAttribute("aria-expanded", open ? "true" : "false");
+      });
+      // Close the drawer when a nav link is clicked (so navigating dismisses it).
+      document.querySelectorAll(".nav a").forEach(a => a.addEventListener("click", () => {
+        bar.classList.remove("nav-open");
+        btn.setAttribute("aria-expanded", "false");
+      }));
+    });
   </script>
 </head>
 <body class="{% block body_class %}{% endblock %}">
@@ -30,7 +45,12 @@
       <img class="brand-icon" src="/static/psyc-logo.png" alt="psyc">
       <span class="brand-sub">operations cockpit</span>
     </a>
-    <nav class="nav">
+    <button class="nav-toggle" type="button" aria-expanded="false" aria-controls="primary-nav" aria-label="Menu">
+      <span class="nav-toggle-bar"></span>
+      <span class="nav-toggle-bar"></span>
+      <span class="nav-toggle-bar"></span>
+    </button>
+    <nav class="nav" id="primary-nav">
       <a href="/cases">Cases</a>
       <a href="/lookup">Lookup</a>
       <a href="/response">Response</a>