function toggleMenu() {
  var nav = document.getElementById('site-nav');
  if (nav) nav.classList.toggle('open');
}

function activateRevealOnScroll() {
  var elements = document.querySelectorAll('.reveal');
  if (!elements.length) return;

  var observer = new IntersectionObserver(function(entries) {
    entries.forEach(function(entry) {
      if (entry.isIntersecting) {
        entry.target.classList.add('active');
      }
    });
  }, { threshold: 0.12 });

  elements.forEach(function(el) {
    observer.observe(el);
  });
}

document.addEventListener('DOMContentLoaded', function() {
  activateRevealOnScroll();
});