/* 弹出框样式 */
 .popup {
  position: fixed;
  top: 50%;
  right: -300px;
  width: auto;
  padding: 10px 16px;
  background-color: rgba(0, 0, 0, 0.8);
  color: #fff;
  transition: right 0.5s ease-in-out, transform 0.5s ease-in-out;
  transform: translateY(-50%);
  text-align: center;
  border-radius: 16px;
  font-size: 14px;
  line-height: 1.5;
  z-index: 9999; /* 将弹出框置于最上层 */
}

/* 关闭按钮样式 */
.close-btn {
  position: absolute;
  top: 5px;
  right: 4px;
  cursor: pointer;
}

/* 波动效果动画 */
@keyframes popupAnimation {
  0% { transform: translateY(-50%) scale(0.5); opacity: 0; }
  50% { transform: translateY(-50%) scale(1.2); opacity: 1; }
  100% { transform: translateY(-50%) scale(1); }
}