header li a{color:#fff;position:relative;}
header li a:after{position:absolute;bottom:-5px;width:0;height:1px;left:0;background:#fc863d;content:"";transition:all .3s;}
header li .cur:after,header li:hover a:after{width:100%;}
header li a{color:#fff;position:relative;}
header li a:after{position:absolute;bottom:-5px;width:0;height:1px;left:0;background:#fc863d;content:"";transition:all .3s;}
header li .cur:after,header li:hover a:after{width:100%;}