/* ==========================================================================
   NEBULON — Animaciones
   Filosofía: un momento orquestado (hero) + revelado sutil al hacer scroll.
   Nada de animar cada tarjeta al hover con la misma transición genérica.
   ========================================================================== */

@keyframes bubble-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse-dot {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* Elementos revelados al hacer scroll (activados por JS con IntersectionObserver) */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}

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

/* Retraso escalonado para grupos de tarjetas (grid), vía variable CSS por índice */
.reveal-stagger {
  transition-delay: calc(var(--stagger-index, 0) * 70ms);
}

.eco-node {
  opacity: 0;
}

.eco-node.is-visible {
  animation: fade-up var(--dur-slow) var(--ease-out) forwards;
}

@media (prefers-reduced-motion: reduce) {
  .reveal,
  .eco-node {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
  }
  .chat-bubble {
    opacity: 1;
    transform: none;
    animation: none;
  }
}