src/layouts/PublicLayout.tsx

@@ -349,6 +349,12 @@ export function PublicLayout() {
   useEffect(() => {
     if (!open) return;
 
+    // Opening the menu from the burger also closes the search overlay, whose
+    // scroll-lock cleanup fires a programmatic scroll. Ignore scroll-to-close
+    // for a brief window so that restore scroll doesn't shut the menu we just
+    // opened; genuine user scrolls afterwards still close it.
+    const openedAt = Date.now();
+
     const closeOnOutside = (event: MouseEvent | TouchEvent) => {
       const target = event.target as Node;
       if (
@@ -360,7 +366,10 @@ export function PublicLayout() {
       }
       setOpen(false);
     };
-    const closeOnScroll = () => setOpen(false);
+    const closeOnScroll = () => {
+      if (Date.now() - openedAt < 250) return;
+      setOpen(false);
+    };
 
     document.addEventListener("mousedown", closeOnOutside);
     document.addEventListener("touchstart", closeOnOutside);