.reveal-on-scroll {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

.module-card:nth-child(1) { animation-delay: 0.05s; }
.module-card:nth-child(2) { animation-delay: 0.1s; }
.module-card:nth-child(3) { animation-delay: 0.15s; }
.module-card:nth-child(4) { animation-delay: 0.2s; }
.module-card:nth-child(5) { animation-delay: 0.25s; }
.module-card:nth-child(6) { animation-delay: 0.3s; }