(function () {
  const root = document.documentElement;
  const KEY = "otb-theme";

  function applyTheme(theme) {
    const resolved = theme === "light" ? "light" : "dark";
    root.setAttribute("data-theme", resolved);
    document.body.classList.toggle("otb-dark", resolved === "dark");
    document.body.classList.toggle("otb-light", resolved === "light");

    const toggle = document.getElementById("otbThemeToggle") || document.getElementById("themeToggle");
    if (toggle) toggle.checked = resolved === "light";
  }

  function savedTheme() {
    try {
      return localStorage.getItem(KEY) || "dark";
    } catch (e) {
      return "dark";
    }
  }

  function saveTheme(theme) {
    try {
      localStorage.setItem(KEY, theme);
    } catch (e) {}
  }

  function setupMenu() {
    const btn = document.getElementById("otbMenuToggle");
    const nav = document.getElementById("otbNavWrap");
    if (!btn || !nav) return;

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

  document.addEventListener("DOMContentLoaded", function () {
    applyTheme(savedTheme());

    const toggle = document.getElementById("otbThemeToggle") || document.getElementById("themeToggle");
    if (toggle) {
      toggle.addEventListener("change", function () {
        const next = toggle.checked ? "light" : "dark";
        saveTheme(next);
        applyTheme(next);
      });
    }

    setupMenu();
  });
})();