/* ============ 悬浮 WhatsApp 客服按钮 ============ */
.chat-float-btn {
  position: fixed;
  top: 55%;
  right: 16px;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: #25D366;
  color: white;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(37, 211, 102, 0.5);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.chat-float-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 30px rgba(37, 211, 102, 0.7);
}
.chat-float-btn:active {
  transform: scale(0.95);
}
.chat-float-btn::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  animation: wa-pulse 2s infinite;
  background: #25D366;
  z-index: -1;
}
@keyframes wa-pulse {
  0% { transform: scale(1); opacity: 0.6; }
  100% { transform: scale(1.6); opacity: 0; }
}

/* 在线状态指示 */
.chat-float-btn .online-dot {
  position: absolute;
  top: 2px;
  right: 2px;
  width: 14px;
  height: 14px;
  background: #4caf50;
  border-radius: 50%;
  border: 2px solid white;
}

/* 离线状态 */
.chat-float-btn.offline {
  background: #999;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.chat-float-btn.offline::after {
  background: #999;
}