New design.

assets/js/nav.js

@@ -0,0 +1,21 @@
+export function initNav(el) {
+    const toggle = el.querySelector(".nav__toggle");
+
+    if (!toggle) {
+        return;
+    }
+
+    const setOpen = (open) => {
+        el.classList.toggle("nav--open", open);
+        toggle.setAttribute("aria-expanded", String(open));
+    };
+
+    toggle.addEventListener("click", () => setOpen(!el.classList.contains("nav--open")));
+    el.querySelectorAll(".nav__link").forEach((link) => link.addEventListener("click", () => setOpen(false)));
+    el.addEventListener("keydown", (e) => {
+        if (e.key === "Escape") {
+            setOpen(false);
+            toggle.focus();
+        }
+    });
+}