/*头部*/
header{background: #fff;}
header .box .nav li a{border-radius: 0 0 12px 12px;;}
header .box .nav li a.cur{background:rgba(0,0,0,0.2);}
header .box .nav li a.cur:hover {background:rgba(0,0,0,0.4);}
header .box .nav li a:hover{background: rgba(0,0,0,0.4);}
header.on .box .nav li a{border-radius: 0;}
header.on .box .nav li a.cur{background:#b00;}
header.on .box .nav li a.cur:hover {background:#b00;}
header.on .box .nav li a:hover{background: #b00;}