.card .nav{width:90%;margin:20px auto 0; font-size:0.8em;}
.card .nav span{cursor:pointer;border:1px solid #000;float:left;width:25%;height:42px;text-align:center;line-height:42px;}
.card .nav span:nth-child(1){border-radius:21px 0 0 21px}
.card .nav span:nth-child(4){border-radius:0 21px 21px 0}
.card .nav span.c{border-left:0;border-right:0}
.card .nav span.c1{border-right:0}
.card .nav span.cur{background:#000;color:#fff}