.whatsapp-float {
  position: fixed; right: 40px; bottom: 40px; z-index: 1000;
  display: flex; width: 60px; height: 60px; padding: 10px;
  align-items: center; justify-content: center; border-radius: 50%;
  background: #25d366; color: #fff; box-shadow: 2px 2px 10px rgba(0,0,0,.15);
  text-decoration: none; transition: background .3s ease, transform .3s ease;
  animation: whatsapp-pulse 2s infinite;
}
.whatsapp-float svg { width: 35px; height: 35px; }
.whatsapp-float:hover { background: #128c7e; color: #fff; transform: scale(1.05); }
@keyframes whatsapp-pulse { 0% { box-shadow: 0 0 0 0 rgba(37,211,102,.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); } }
@media (max-width: 767px) {
  .whatsapp-float { right: 20px; bottom: 20px; width: 50px; height: 50px; }
  .whatsapp-float svg { width: 28px; height: 28px; }
}
@media (prefers-reduced-motion: reduce) { .whatsapp-float { animation: none; } }