.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.9s ease, transform 0.9s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-in:nth-child(2) { transition-delay: 0.12s; }
.fade-in:nth-child(3) { transition-delay: 0.24s; }
.fade-in:nth-child(4) { transition-delay: 0.36s; }