script.js

const navToggle = document.querySelector('.nav-toggle');
const nav = document.querySelector('.site-nav');

const closeNav = () => {
  navToggle.setAttribute('aria-expanded', 'false');
  nav.classList.remove('is-open');
};

if (navToggle && nav) {
  navToggle.addEventListener('click', () => {
    const open = navToggle.getAttribute('aria-expanded') === 'true';
    navToggle.setAttribute('aria-expanded', String(!open));
    nav.classList.toggle('is-open', !open);
  });

  nav.addEventListener('click', (event) => {
    if (event.target instanceof HTMLAnchorElement) {
      closeNav();
    }
  });

  document.addEventListener('keydown', (event) => {
    if (event.key === 'Escape' && nav.classList.contains('is-open')) {
      closeNav();
      navToggle.focus();
    }
  });

  window.addEventListener('resize', () => {
    if (window.innerWidth > 900) {
      closeNav();
    }
  });
}