!base_font_size ||= 14px
 !base_font_size_small ||= 12px
 !h6 ||= !base_font_size
 !h5 ||= ceil(!h6*1.1)
 !h4 ||= ceil(!h5*1.1)
 !h3 ||= ceil(!h4*1.2)
 !h2 ||= ceil(!h3*1.25)
 !h1 ||= ceil(!h2*1.255)
 
 =set-heading-sizes(!font_size = !base_font_size)
   !h6 = !font_size
   !h5 = ceil(!h6*1.1)
   !h4 = ceil(!h5*1.1)
   !h3 = ceil(!h4*1.2)
   !h2 = ceil(!h3*1.25)
   !h1 = ceil(!h2*1.255)
   h1, h2, h3, h4
     &:first-child
       margin-top: 0
   h1
     font-size= !h1
     margin-bottom= !h2/2
     line-height= !h1 * 1.2
   h2
     font-size= !h2
     margin= !h2/2 0 !h2/2
     line-height= !h2 * 1.2
   h3
     font-size= !h3
     margin= !h2/2 0 !h2/2
     line-height= !h3 * 1.2
   h4
     font-size= !h4
     margin= !h4/2 0 !h4/2
     line-height= !h4 * 1.2
   h5
     font-size= !h5
     margin= !h4/2 0 !h4/2
     line-height= !h5 * 1.2
   h6
     font-size= !h6
     margin= !h4/2 0 !h4/2
     line-height= !h6 * 1.2
 
 =typography-defaults(!font_size = !base_font_size)
   line-height= ceil(!font_size * 1.5)
   p
     padding-bottom= !font_size * 2
   h1,h2,h3,h4,h5,h6
     font-weight: bold
   em
     font-style: italic
   strong
     font-weight: bold
   span.highlight, em.highlight, strong.highlight
     background-color: #ff6
     padding: 2px
     margin: 0 -2px
   ul, ol, dl
     list-style: inside
     margin= 0 0 (!font_size)
   li
     padding: 0 0 2px
   small
     font-size= floor(!font_size * .85)
   big
     font-size= floor(!font_size * 1.25)