$font-stack: "Polaris", Helvetica, sans-serif;
$font-stack-serif: "Copernicus", serif;
$font-heavy: 900;
$font-bold: 700;
$font-medium: 500;
$font-book: 300;
$font-light: 100;

/* Make type rendering look crisper */
/* Disable auto-enlargement of small text in Safari */
/* Enable kerning and optional ligatures */
html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
}

.font-heavy {
  font-family: $font-stack;
  font-weight: $font-heavy;

  &-serif {
    @extend .font-heavy;
    font-family: $font-stack-serif;
  }
}

.font-bold {
  font-family: $font-stack;
  font-weight: $font-bold;

  &-serif {
    @extend .font-bold;
    font-family: $font-stack-serif;
  }
}

.font-medium {
  font-family: $font-stack;
  font-weight: $font-medium;

  &-serif {
    @extend .font-medium;
    font-family: $font-stack-serif;
  }
}

.font-book {
  font-family: $font-stack;
  font-weight: $font-book;

  &-serif {
    @extend .font-book;
    font-family: $font-stack-serif;
  }
}

.font-light {
  font-family: $font-stack;
  font-weight: $font-light;

  &-serif {
    @extend .font-light;
    font-family: $font-stack-serif;
  }
}