.slideshow {
    height: 400px;
    object-fit: cover;
}

.top-jumbotron {
    padding: 0;
    position: relative;
}

.top-jumbotron .top-text {
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    z-index: 999;
    display: flex;
    justify-content: center;
    align-items: center;
}

.bg-img .swiper-container {
    height: 100%;
}

.bg-img .slideshow {
    height: 100%;
}

/* 父项相对定位，为绝对定位提供参考 */
#download-app {
  position: relative;
}

/* 二维码弹出层样式 */
#download-app-qrcode {
  position: absolute;
  top: 100%;
  left: -100%;
  z-index: 1000;
  background: white;
  padding: 12px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  min-width: 130px;

  /* 渐隐渐显关键：初始透明且不可见 */
  opacity: 0;
  visibility: hidden;
  pointer-events: none; /* 防止鼠标误触隐藏时的区域 */

  /* 添加过渡动画 */
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

/* 悬停时显示 */
#download-app:hover #download-app-qrcode {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.download-app-qrcode-item {
    width: 130px;
}