#startup-layer {
  position: fixed;
  top: 0; left: 0;
  width: 100vw; height: 100vh;
  background-color: #fff; 
  z-index: 10000;
  
  /* 【核心修改 1】：默认就是隐藏的，彻底根治跳转后白屏的问题 */
  display: none; 
  justify-content: center;
  align-items: center;
  
  /* 【核心修改 2】：设置淡出的过渡动画，0.8秒 */
  opacity: 1;
  transition: opacity 0.8s ease-in-out; 
}

/* 专门用来控制淡出的类 */
.startup-fade-out {
  opacity: 0 !important;
  pointer-events: none !important;
}

#lottie-container {
  width: 80%; height: 80%;
  max-width: 800px;
  display: flex; justify-content: center; align-items: center;
}
#lottie-container svg {
  width: 100% !important; height: auto !important; display: block;
}