.whatsapp-fab {
  position: fixed;
  bottom: 28px;
  inset-inline-end: 28px;
  z-index: 9999;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--color-whatsapp);
  color: #fff;
  display: grid;
  place-items: center;
  box-shadow: 0 4px 24px rgba(37, 211, 102, 0.45), 0 2px 8px rgba(0,0,0,0.2);
  transition: transform 160ms var(--ease-out), box-shadow 160ms var(--ease-out);
  text-decoration: none;
}

.whatsapp-fab::before {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  background: rgba(37, 211, 102, 0.25);
  animation: wa-pulse 2.4s ease-out infinite;
  pointer-events: none;
}

.whatsapp-fab::after {
  content: '';
  position: absolute;
  inset: -12px;
  border-radius: 50%;
  background: rgba(37, 211, 102, 0.12);
  animation: wa-pulse 2.4s ease-out infinite 0.6s;
  pointer-events: none;
}

@media (hover: hover) and (pointer: fine) {
  .whatsapp-fab:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 32px rgba(37, 211, 102, 0.6), 0 2px 8px rgba(0,0,0,0.25);
  }
}

.whatsapp-fab:active {
  transform: scale(0.95);
}

@keyframes wa-pulse {
  0%   { transform: scale(1);   opacity: 0.7; }
  100% { transform: scale(1.6); opacity: 0; }
}