document.addEventListener('DOMContentLoaded', () => {
  const sections = document.querySelectorAll('.cards-section, .stats-section, .form-section');
  if (!('IntersectionObserver' in window)) return;
  const observer = new IntersectionObserver((entries) => {
    entries.forEach(entry => {
      if (entry.isIntersecting) {
        entry.target.style.opacity = '1';
        entry.target.style.transform = 'translateY(0)';
        observer.unobserve(entry.target);
      }
    });
  }, { threshold: 0.1 });

  sections.forEach(s => {
    s.style.opacity = '0';
    s.style.transform = 'translateY(20px)';
    s.style.transition = 'opacity 0.6s ease, transform 0.6s ease';
    observer.observe(s);
  });
});