Fehlerkorrekturen und FInktionserweiterung

adventskalender/shared/js/header.js

@@ -0,0 +1,24 @@
+document.addEventListener("DOMContentLoaded", () => {
+  const header = document.querySelector(".main-header");
+  const burger = document.getElementById("burgerBtn");
+  const nav = document.getElementById("mainNav");
+
+  // --- Burger-Menü ---
+  if (burger && nav) {
+    burger.addEventListener("click", () => {
+      burger.classList.toggle("active");
+      nav.classList.toggle("active");
+    });
+  }
+
+  // --- Scrollverhalten ---
+  if (header) {
+    window.addEventListener("scroll", () => {
+      if (window.scrollY > 40) {
+        header.classList.add("scrolled");
+      } else {
+        header.classList.remove("scrolled");
+      }
+    });
+  }
+});