@charset "utf-8";
/*width640pxˆÈ‰º*/
@media screen and (max-width: 640px) {


.nav {
  text-align: center;
}
#panel-btn{
  display: block;
  display: inline-block;
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #fff;
  font-size:8px;
  margin-bottom: 5px;
}
a#panel-btn{
  text-decoration: none;
  font-color:#6CC;
  font-weight: bold;
}
#panel-btn:hover{
  background: #fafafa;
}
#panel-btn-icon{
  display: block;
  position: absolute;
  top: 50%;
  left: 50%;
  width: 14px;
  height: 2px;
  margin: -1px 0 0 -7px;
  background: #6CC;
  transition: .2s;
}
#panel-btn-icon:before, #panel-btn-icon:after{
  display: block;
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 14px;
  height: 2px;
  background: #6CC;
  transition: .3s;
}
#panel-btn-icon:before{
  margin-top: -6px;
}
#panel-btn-icon:after{
  margin-top: 4px;
}
#panel-btn .close{
  background: transparent;
}
#panel-btn .close:before, #panel-btn .close:after{
  margin-top: 0;
}
#panel-btn .close:before{
  transform: rotate(-45deg);
  -webkit-transform: rotate(-45deg);
}
#panel-btn .close:after{
  transform: rotate(-135deg);
  -webkit-transform: rotate(-135deg);
}
}