header{display:block;position:fixed;top:0;left:0;right:0;z-index:100}header,.header-offset{height:7em;transition:transform .4s,box-shadow .1s}body.scroll-down header,body.scroll-down .header-offset{transform:translate3d(0,-110%,0)}body.scroll-down header{box-shadow:none}body.scroll-up header,body.scroll-up .header-offset,body.fixed header,body.fixed .header-offset{transform:none}body.scroll-up header,body.fixed header{box-shadow:0 1px 3px rgba(0,0,0,0.8)}header .logo{width:172px;height:64px}