src/app/shop/[id]/page.tsx

@@ -83,6 +83,10 @@ function ProductPageContent({ params }: ProductPageProps) {
             brandName="Dring Together"
             navItems={navItems}
             button={{ text: "Cart", onClick: () => setCartOpen(true) }}
+            mobileMenuItems={[
+                ...navItems,
+                { type: 'button', text: "Cart", onClick: () => setCartOpen(true) }
+            ]}
         />
     );