// Stackless — shared header behaviour (mobile menu + current page highlight)
(function () {
  var btn = document.getElementById('menuBtn');
  var nav = document.getElementById('nav');
  if (btn && nav) {
    btn.addEventListener('click', function () { nav.classList.toggle('is-open'); });
    nav.addEventListener('click', function (e) {
      if (e.target.tagName === 'A') nav.classList.remove('is-open');
    });
  }
  // Mark current nav item
  var here = (location.pathname.split('/').pop() || 'index.html').toLowerCase();
  document.querySelectorAll('.nav a').forEach(function (a) {
    var href = (a.getAttribute('href') || '').toLowerCase();
    if (!href || href.startsWith('#')) return;
    if (href === here) a.classList.add('is-current');
  });
})();