(function () {
  "use strict";

  // Header shadow on scroll
  var header = document.getElementById("siteHeader");
  function onScroll() {
    if (window.scrollY > 8) {
      header.classList.add("is-scrolled");
    } else {
      header.classList.remove("is-scrolled");
    }
  }
  document.addEventListener("scroll", onScroll, { passive: true });
  onScroll();

  // Mobile nav toggle
  var toggle = document.getElementById("navToggle");
  var nav = document.getElementById("mainNav");

  function closeNav() {
    nav.classList.remove("is-open");
    toggle.setAttribute("aria-expanded", "false");
  }

  toggle.addEventListener("click", function () {
    var isOpen = nav.classList.toggle("is-open");
    toggle.setAttribute("aria-expanded", isOpen ? "true" : "false");
  });

  nav.querySelectorAll("a").forEach(function (link) {
    link.addEventListener("click", closeNav);
  });

  window.addEventListener("resize", function () {
    if (window.innerWidth > 720) closeNav();
  });
})();