/* background.css */
#space-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -10; /* 确保在所有内容之下 */
  background-image: url('images/background1.jpg'); /* 替换为你的图路径 */
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.6;
  pointer-events: none; /* 不阻挡用户点击其他内容 */
  animation: slowFade 20s infinite alternate ease-in-out;
}

@keyframes slowFade {
  0% {
    opacity: 0.5;
    transform: scale(1);
  }
  100% {
    opacity: 0.7;
    transform: scale(1.02);
  }
}