.waBtn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--sage-500);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(113,131,85,0.4);
  z-index: 150;
  font-size: 1.5rem;
  transition: transform 0.2s, box-shadow 0.2s;
  text-decoration: none;
}
.waBtn:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 24px rgba(113,131,85,0.5);
}

@media (max-width: 768px) {
  .waBtn {
    width: 48px;
    height: 48px;
    bottom: 80px; /* above bottom nav bars */
    right: 16px;
  }
}