.whatsapp-float {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
  width: 58px;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #25d366;
  color: var(--white);
  border-radius: 50%;
  font-size: 1.6rem;
  box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4);
  transition: var(--transition);
  animation: floatWA 2.5s ease-in-out infinite;
}

.whatsapp-float:hover {
  transform: scale(1.1);
  box-shadow: 0 8px 30px rgba(37, 211, 102, 0.5);
  color: var(--white);
}

@keyframes floatWA {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@media (max-width: 480px) {
  .whatsapp-float {
    width: 50px;
    height: 50px;
    font-size: 1.3rem;
    bottom: 16px;
    right: 16px;
  }
}

@media (max-width: 1024px) {
  .section__title { font-size: 1.8rem; }
}

@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .section__title { font-size: 1.6rem; }
  .section__desc { font-size: 1rem; }
  .section__header { margin-bottom: 40px; }
  .btn--lg { padding: 14px 28px; font-size: 0.95rem; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .section__title { font-size: 1.4rem; }
}