// Highlight active nav link on scroll
const sections = document.querySelectorAll('section[id]');
const links = document.querySelectorAll('nav a');

const observer = new IntersectionObserver(entries => {
  entries.forEach(e => {
    if (e.isIntersecting) {
      links.forEach(l => l.classList.remove('active'));
      const active = document.querySelector(`nav a[href="#${e.target.id}"]`);
      if (active) active.classList.add('active');
    }
  });
}, { threshold: 0.3 });

sections.forEach(s => observer.observe(s));

// Hide the profile photo if it fails to load
const profilePhoto = document.querySelector('.profile-photo');
if (profilePhoto) {
  profilePhoto.addEventListener('error', () => {
    profilePhoto.style.display = 'none';
  });
}