header.fixed .m-btn .line{
  background-color: #000;
}
body:hover header .m-btn .line{
  background-color: #000;
}
.i-ban li .gray-bg {
  display: block;
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1;
  background-color: #000;
  opacity: 0;
  filter: alpha(opacity=0);
  transition: 0.5s ease;
}
.i-ban li.active .gray-bg {
  opacity: 0.4;
  filter: alpha(opacity=0.4);
}
.i-wrap .up-graybox .tit{
  font-size: 1.4vw;
  line-height: 30px;
  width: 100%;
  text-align: center;
  position: absolute;
  left: 0;
  top: 0;
  color: #fff;
  margin-top:1.5vw;
}
.i-wrap .up-graybox .btit {
  font-size:5vw;
  font-family: "simhei";
  font-weight: bold;
  line-height: 5.8vw;
  margin-top:1.2vw;
}
.i-wrap .up-graybox .see_btn{
  display: block;
  background: url(../img/btn_0.jpg) no-repeat center center;
  height: 2.4vw;
  background-size: contain;
  margin: 0.5vw 0 1vw 0;
}
.i-wrap .up-graybox .see_btn:hover {
  cursor: pointer;
}
.i-wrap .up-graybox .line{
  height:4px;
}
.i-wrap .up-graybox:hover .linet {
  width:100px;
  margin-left: -50px;
  opacity: 1;
  filter: alpha(opacity=100);
}
.i-wrap .up-graybox:hover .lineb {
  width:50px;
  margin-left: -25px;
  opacity: 1;
  filter: alpha(opacity=100);
}