.header-placeholder
  {R}
  
.header-placeholder-fixed
  {R}
  display none

.header-fixed
  .header-placeholder-fixed
    display block
  #header
    fixed top left zi 990
    transform translateY(0)
    {tr}
    .admin-menu&
      top 29

.always-fixed
  #header
    fixed zi 990

.header-hide
  #header
    transform translateY(-100%)