.whatsapp-btn {
  position: fixed;
  bottom: 27px;
  left: 27px;
  z-index: 9999;
  width: 65px;
  height: 65px;
  border-radius: 50%;
  background-color: #25D366;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.7);
  animation: pulse-glow 2.5s infinite;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: pointer;
}

.whatsapp-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 0 12px 6px rgba(37, 211, 102, 0.6);
}

.whatsapp-btn i {
  color: #fff;
  font-size: 35px;
  line-height: 1;
  animation: heartbeat 1.3s ease-in-out infinite;
  animation-delay: 0.2s;
}

/* Animación suave de respiración con sombra */
@keyframes pulse-glow {
  0% {
    box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.7);
  }
  50% {
    box-shadow: 0 0 0 12px rgba(37, 211, 102, 0.0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.0);
  }
}

/* Latido suave del ícono */
@keyframes heartbeat {
  0%, 100% {
    transform: scale(1);
  }
  40% {
    transform: scale(1.15);
  }
  60% {
    transform: scale(0.95);
  }
}