:root {
  --whatsapp-color: #25D366;
  --whatsapp-hover: #128C7E;
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.2);
  --transition-fast: all 0.1s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* Botão WhatsApp fixo */
.whatsapp-fixo {
  position: fixed;
  bottom: 25px;
  right: 25px;
  background-color: var(--whatsapp-color);
  color: white;
  border-radius: 50%;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  box-shadow: var(--shadow-md);
  z-index: 1000;
  transition: var(--transition-fast);
  text-decoration: none;
  border: 2px solid transparent;
  animation: pulse 2s infinite;
}

.whatsapp-fixo:hover {
  transform: scale(1.1) rotate(5deg);
  background-color: var(--whatsapp-hover);
  box-shadow: 0 10px 30px rgba(37, 211, 102, 0.4);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Animação do botão */
@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.7);
  }
  70% {
    box-shadow: 0 0 0 15px rgba(37, 211, 102, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(37, 211, 102, 0);
  }
}

/* Responsividade */
@media (max-width: 768px) {
  .whatsapp-fixo {
    width: 50px;
    height: 50px;
    font-size: 24px;
    bottom: 15px;
    right: 15px;
  }
}

@media (max-width: 480px) {
  .whatsapp-fixo {
    width: 44px;
    height: 44px;
    font-size: 22px;
    bottom: 10px;
    right: 10px;
  }
}