/* 首页头图视频背景：覆盖 Butterfly 默认蓝色背景 */
#page-header.full_page {
  background-image: none !important;
  background-color: #0a0a0a;
  overflow: hidden;
}

#page-header.full_page .header-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
  pointer-events: none;
}

/* 导航栏 / 遮罩 / 标题 / 向下箭头 置于视频之上 */
#page-header.full_page #nav,
#page-header.full_page .mask,
#page-header.full_page #site-info,
#page-header.full_page #scroll-down {
  position: relative;
  z-index: 2;
}