html,
body {
  margin: 0;
  padding: 0;
  line-height: 1;
  font-family: "Source Han Sans CN" !important;
  color: #333;
  box-sizing: border-box;
  background-color: #F5F7F9;
  user-select: none;
}
@media (min-width: 640px){html{font-size: 33.333px;} }
@media (min-width: 800px){html{font-size: 41.666px;} }
@media (min-width: 960px){html{font-size: 50px;} }
@media (min-width: 1280px){html{font-size: 66.666px;} }
@media (min-width: 1440px){html{font-size: 75px;} }
@media (min-width: 1680px){html{font-size: 87.5px;} }
@media (min-width: 1920px){html{font-size: 100px;} }
.header_root {
  position: fixed;
  width: 100%;
  color: #fff;
  background-color: transparent;
  z-index: 9999;
}
.header_root.bg_white {
  color: #333;
  background-color: #fff;
}
.header_root:hover {
  color: #333;
  background-color: #fff;
} 
.header_root:hover .header_box .header_left .left_white,
.header_root.bg_white .header_box .header_left .left_white {
  display: none;
}
.header_root:hover .header_box .header_left .left_gray,
.header_root.bg_white .header_box .header_left .left_gray {
  display: inline-block;
}
.footer_root {
  background-color: #F5F7F9;
}
.header_info {
  position: absolute;
  top: 0.8rem;
  left: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  width: 13rem;
  height: 0.84rem;
  color: white;
}

.header_title {
  font-size: 0.36rem;
  font-weight: 700;
}

.header_stitle {
  padding-top: 0.3rem;
  font-size: 0.16rem;
}