.loading-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #222;
  z-index: 9999;
  animation: fadeOut 2s forwards; /* 3秒后消失，forwards 保持最终状态 */
  animation-delay: 3s;
}

@keyframes fadeOut {
  0% {
    opacity: 1; /* 完全可见 */
  }
  100% {
    opacity: 0; /* 完全透明 */
  }
}