.whatsapp-round-btn {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 9999;
  width: 60px;
  height: 60px;
  background-color: #25D366;
  border-radius: 50%; /* Torna o botão perfeitamente redondo */
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  box-shadow: 0 10px 25px rgba(37, 211, 102, 0.4);
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* ÍCONE */
.whatsapp-icon {
  width: 32px;
  height: 32px;
}

/* TOOLTIP NO HOVER (SUBTIL E ELEGANTE) */
.whatsapp-tooltip {
  position: absolute;
  right: 72px;
  background-color: #0f172a;
  color: #ffffff;
  padding: 8px 14px;
  border-radius: 8px;
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transform: translateX(10px);
  transition: all 0.25s ease;
  box-shadow: 0 10px 20px rgba(0,0,0,0.15);
  pointer-events: none;
}

.whatsapp-tooltip::after {
  content: '';
  position: absolute;
  top: 50%;
  right: -5px;
  transform: translateY(-50%);
  border-width: 5px 0 5px 5px;
  border-style: solid;
  border-color: transparent transparent transparent #0f172a;
}

/* EFEITOS INTERATIVOS */
.whatsapp-round-btn:hover {
  background-color: #20ba5a;
  transform: scale(1.1) rotate(5deg);
  box-shadow: 0 15px 30px rgba(37, 211, 102, 0.5);
}

.whatsapp-round-btn:hover .whatsapp-tooltip {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}

/* ONDA ARREDONDADA DE ATENÇÃO (PULSE) */
.whatsapp-round-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  border: 2px solid #25D366;
  animation: pulse-round 2s infinite ease-in-out;
  z-index: -1;
}

@keyframes pulse-round {
  0% {
    transform: scale(1);
    opacity: 0.8;
  }
  100% {
    transform: scale(1.35);
    opacity: 0;
  }
}

/* RESPONSIVIDADE PARA CELULARES */
@media (max-width: 480px) {
  .whatsapp-round-btn {
    width: 52px;
    height: 52px;
    bottom: 20px;
    right: 20px;
  }
  .whatsapp-icon {
    width: 28px;
    height: 28px;
  }
  .whatsapp-tooltip {
    display: none; /* Oculta a etiqueta em telas pequenas */
  }
}