const $ = x => Array.from(document.querySelectorAll(x));
const $$ = x => Array.from(document.querySelector(x));

document.addEventListener('DOMContentLoaded', function() {
  const themeToggleBtn = document.getElementById('theme-toggle-btn');
  if (themeToggleBtn) {
    themeToggleBtn.addEventListener('click', function() {
      const root = document.documentElement;
      if (root.classList.contains("dark")) {
        root.classList.remove("dark");
        root.setAttribute("data-theme", "light");
        localStorage.setItem("theme", "light");
      } else {
        root.classList.add("dark");
        root.setAttribute("data-theme", "dark");
        localStorage.setItem("theme", "dark");
      }
    });
  }
});