@import url(//fonts.googleapis.com/css?family=Cousine:400,700,400italic,700italic)

=cousine($fw: 400, $ls: 0, $fs: null, $tx-rendering: true)
  // $fw: フォントの太さ, $ls: 字間, $fs: フォントスタイル
  font-family: 'Cousine'
  font-weight: $fw
  @if not $ls == 0
    letter-spacing: $ls
  @if (not $fs == null)
    font-style: italic
  @if $tx-rendering
    text-rendering: optimizelegibility