/* ── Animaciones de entrada ─────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Delay escalonado para grids */
.servicio-card:nth-child(1), .producto-card:nth-child(1), .porque-card:nth-child(1) { transition-delay: 0.05s; }
.servicio-card:nth-child(2), .producto-card:nth-child(2), .porque-card:nth-child(2) { transition-delay: 0.12s; }
.servicio-card:nth-child(3), .producto-card:nth-child(3), .porque-card:nth-child(3) { transition-delay: 0.19s; }
.servicio-card:nth-child(4), .producto-card:nth-child(4), .porque-card:nth-child(4) { transition-delay: 0.26s; }
.servicio-card:nth-child(5), .producto-card:nth-child(5), .porque-card:nth-child(5) { transition-delay: 0.33s; }
.servicio-card:nth-child(6), .producto-card:nth-child(6), .porque-card:nth-child(6) { transition-delay: 0.40s; }