.nav {
  position: absolute;
  /* top: -2000vw;
  left: -2000vw; */
  opacity: 0;
  /* background: pink; */
  height: 1vw;
  -webkit-transition-property: all;
  transition-property: all;
  /* -webkit-transition-duration: 500ms; */
          /* transition-duration: 10ms; */
}
.nav--active .nav {
  opacity: 1;
  position: absolute;
  top: 0;
  left: 0;
  height: 260vw;
}
.nav__trigger {
  display: block;
  position: absolute;
  width: 7vw;
  height: 25px;
  right: 4vw;
  top: 4vw;
  z-index: 200;
}
.nav__icon {
  display: inline-block;
  position: relative;
  width: 100%;
  /* height: 0.8vw; */
  background-color: #FFFFFF;
  -webkit-transition-property: background-color, -webkit-transform;
  transition-property: background-color, -webkit-transform;
  transition-property: background-color, transform;
  transition-property: background-color, transform, -webkit-transform;
  -webkit-transition-duration: 500ms;
          transition-duration: 500ms;
}
.nav__icon:before,
.nav__icon:after {
  content: '';
  display: block;
  width: 100%;
  height: 0.8vw;
  position: absolute;
  background: #FFFFFF;
  -webkit-transition-property: margin, -webkit-transform;
  transition-property: margin, -webkit-transform;
  transition-property: margin, transform;
  transition-property: margin, transform, -webkit-transform;
  -webkit-transition-duration: 500ms;
          transition-duration: 500ms;
}
.nav__icon:before {
  margin-top: -3vw;
}
.nav__icon:after {
  margin-top: 1vw;
}
/**
* Style #5
*/
.style-5 .nav {
  /* -webkit-transform: translate(100%, -100%) scale(0.5);
          transform: translate(100%, -100%) scale(0.5); */
  /* border-radius: 100%; */
  overflow: hidden;
}
.style-5 .qiehuan{
  /* height: 260vw; */
}
.style-5 .nav--active .nav {
  border-radius: 0;
  width: 100%;
  height: 260vw;
  background: #fff;
}
.style-5 .nav__link {
  opacity: 0;
  /* -webkit-transition-delay: 500ms;
          transition-delay: 500ms; */
}
.style-5 .nav--active .nav__icon:before {
  margin-top: 0;
  -webkit-transform: rotate(45deg);
          transform: rotate(45deg);
          background: #000;
          height: 0.5vw;
          width: 6vw;
}
.style-5 .nav--active .nav__icon:after {
  margin-top: 0;
  -webkit-transform: rotate(-45deg);
          transform: rotate(-45deg);
          background: #000;
          height: 0.5vw;
          width: 6vw;
}
.nav .cs-logo{
  width: 34vw;
  height: 7vw;
  margin: 3.6vw;
}
.nav .cs-logo img{
  width: 100%;
  height: 100%;
}
.nav .nav-ul{
  margin-top: 10vw;
  width: 100%;
  height: 0vw;
}
.nav .nav-ul li{
  /* height: 10vw; */
  text-align: center;
  margin-bottom: 8vw;
  font-size: 5vw;
}
.nav .nav-ul li a{
  color: #000
}