Scroll-Triggered Animations in CSS

/* Intersection Observer API (JavaScript) */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.5s;
}

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

/* CSS Scroll Snap */
.container {
  scroll-snap-type: y mandatory;
}

.section {
  scroll-snap-align: start;
}