/* 轮播背景样式 */
.background-carousel {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -999;
  overflow: hidden;
}

.background-carousel img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 2s ease-in-out;
}

.background-carousel img.active {
  opacity: 1;
}

/* 确保内容在背景之上 */
#web_bg {
  display: none;
}

.layout > div:first-child {
  position: relative;
  z-index: 1;
}