!default_border_radius ||= 5px

// Round all borders by amount
=border-radius(!radius = !default_border_radius)
  border-radius= !radius
  -moz-border-radius= !radius
  -webkit-border-radius= !radius

// Round radius at position by amount.
// values for !vert: "top", "bottom"
// values for !horz: "left", "right
=border-corner-radius(!vert, !horz, !radius = !default_border_radius)
  border-#{!vert}-#{!horz}-radius= !radius
  -moz-border-radius-#{!vert}#{!horz}= !radius
  -webkit-border-#{!vert}-#{!horz}-radius= !radius
  
=border-top-left-radius(!radius = !default_border_radius)
  +border-corner-radius("top", "left", !radius)

=border-top-right-radius(!radius = !default_border_radius)
  +border-corner-radius("top", "right", !radius)

=border-bottom-left-radius(!radius = !default_border_radius)
  +border-corner-radius("bottom", "left", !radius)

=border-bottom-right-radius(!radius = !default_border_radius)
  +border-corner-radius("bottom", "right", !radius)

// Round top corners by amount
=border-top-radius(!radius = !default_border_radius)
  +border-top-left-radius(!radius)
  +border-top-right-radius(!radius)

// Round right corners by amount
=border-right-radius(!radius = !default_border_radius)
  +border-top-right-radius(!radius)
  +border-bottom-right-radius(!radius)

// Round bottom corners by amount
=border-bottom-radius(!radius = !default_border_radius)
  +border-bottom-left-radius(!radius)
  +border-bottom-right-radius(!radius)

// Round left corners by amount
=border-left-radius(!radius = !default_border_radius)
  +border-top-left-radius(!radius)
  +border-bottom-left-radius(!radius)