*{
  margin: 0;
  padding: 0;
}

html{
  font-size: 16px;
}

a{
 text-decoration: none; 
 color: #000;
}

a:hover{
  color: #000;
}

.header{
  width:100%;
  height:80px;
  position: sticky;
  top:0;
  z-index: 1000;
  background-color: #fafafa;
}


.header div{
  height:80px;
  line-height: 80px;
}

.header .left{
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: flex-start;
}

.header .left img{
  width:44px;
  height:44px;
}

.header .left div{
  font-family: rui;
  font-size: 28px;
  margin-left:16px;
}

.header .item{
  text-align: center;
  font-size: 20px;
  color:#252525;
  cursor: pointer;
  font-family: noto;
}

.hidden_item{
  display: none;
}

.show {
  width: 100%;
  height: 66px;
  line-height: 66px;
  text-align: center;
  background-color: #fafafa;
  font-size: 20px;
  color:#252525;
  cursor: pointer;
  font-family: noto;
}