/* static-design-system — theme-toggle.js
   Shared chrome behavior: color-theme toggle + mobile (hamburger) menu.
   Served to each site via a wrapper (assets/ds.js) and loaded at end of body.
   Storage key must match ds/theme-init.js. */
(function () {
  "use strict";

  var THEME_KEY = "bchen-theme";

  function effectiveTheme() {
    var set = document.documentElement.getAttribute("data-theme");
    if (set) return set;
    return window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
  }

  /* ---- theme toggle ---- */
  var toggleBtn = document.querySelector(".theme-toggle");
  if (toggleBtn) {
    toggleBtn.addEventListener("click", function () {
      var next = effectiveTheme() === "dark" ? "light" : "dark";
      document.documentElement.setAttribute("data-theme", next);
      try { localStorage.setItem(THEME_KEY, next); } catch (e) {}
    });
  }

  /* ---- mobile menu ---- */
  var hamburger = document.querySelector(".hamburger");
  var mobileMenu = document.querySelector(".mobile-menu");
  if (hamburger && mobileMenu) {
    hamburger.addEventListener("click", function () {
      var open = mobileMenu.classList.toggle("open");
      hamburger.classList.toggle("is-open", open);
      hamburger.setAttribute("aria-expanded", open ? "true" : "false");
    });
  }
})();