.onda-roja {
  position: relative;
  display: inline-block;
  animation: latidoIcono 2s infinite ease-in-out; /* latido del ícono */
}

.onda-roja::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background: rgba(255, 0, 0, 0.9); /* rojo intenso */
  animation: ondaExpandir 2s infinite ease-out;
  z-index: 0;
  box-shadow: 0 0 20px rgba(255, 0, 0, 0.8); /* sombra roja */
}

.onda-roja img {
  position: relative;
  z-index: 1;
}

@keyframes ondaExpandir {
  0% {
    width: 100%;
    height: 100%;
    opacity: 1;
  }
  100% {
    width: 250%;
    height: 250%;
    opacity: 0;
  }
}

@keyframes latidoIcono {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.08); /* leve zoom para simular latido */
  }
}