.fade-in-section {
  opacity: 0;
  transform: translateY(100px);
  visibility: hidden;
  transition: opacity 1s ease-out, transform 0.6s ease-out;
  will-change: opacity, transform, visibility;
}

.fade-in-section.is-visible {
  opacity: 1;
  transform: translateY(0);
  visibility: visible;
}