.whatsapp-join-button {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, #25D366, #128C7E);
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(37, 211, 102, 0.6);
  display: flex;
  justify-content: center;
  align-items: center;
  color: white;
  font-size: 28px;
  cursor: pointer;
  z-index: 10000;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  text-decoration: none;
  user-select: none;
}

.whatsapp-join-button:hover {
  transform: scale(1.15);
  box-shadow: 0 6px 20px rgba(37, 211, 102, 0.9);
}

.whatsapp-join-button .tooltip {
  position: absolute;
  bottom: 70px;
  right: 50%;
  transform: translateX(50%);
  background-color: #128C7E;
  color: white;
  padding: 6px 12px;
  border-radius: 12px;
  font-size: 0.85rem;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  user-select: none;
}

.whatsapp-join-button:hover .tooltip {
  opacity: 1;
  pointer-events: auto;
}

@media (max-width: 600px) {
  .whatsapp-join-button {
    width: 50px;
    height: 50px;
    font-size: 24px;
    bottom: 15px;
    right: 15px;
  }

  .whatsapp-join-button .tooltip {
    bottom: 60px;
    font-size: 0.75rem;
  }
}