$pass: green !default;
$fail: red;
$width: 600px;
$number: 5;

.color {
  color: $pass;
}

$orientation: landscape;

@media (min-width: $width), handheld and (orientation: $orientation) {
  $pass: white !default;

  .color {
    color: $pass;
  }
}

@if 1 == 1 {
  .is-1-equal-to-1 {
    color: $pass;
  }
} @else {
  .not-is-1-equal-to-1 {
    color: $fail;
  }
}

@if 1 == 2 {
  .is-1-equal-to-2 {
    color: $fail;
  }
} @else {
  .not-is-1-equal-to-2 {
    color: $pass;
  }
}

@if $number == 1 {
  .is-number-equal-to-1 {
    color: $fail;
  }
} @else {
  .not-number-equal-to-1 {
    color: $pass;
  }
}

@if $number == 5 {
  .is-number-equal-to-5 {
    color: $pass;
  }
} @else {
  .not-number-equal-to-5 {
    color: $fail;
  }
}

@if 1 != 1 {
  .is-1-not-equal-to-1 {
    color: $fail;
  }
}

@if 1 != 2 {
  .is-1-not-equal-to-2 {
    color: $pass;
  }
}

@if 1 < 0 {
  .is-1-less-than-0 {
    color: $fail;
  }
}

@if 1 < 1 {
  .is-1-less-than-1 {
    color: $fail;
  }
}

@if 1 < 2 {
  .is-1-less-than-2 {
    color: $pass;
  }
}

@if 1 > 0 {
  .is-1-greater-than-0 {
    color: $pass;
  }
}

@if 1 > 1 {
  .is-1-greater-than-1 {
    color: $fail;
  }
}

@if 1 > 2 {
  .is-1-greater-than-2 {
    color: $fail;
  }
}

@if 1 <= 0 {
  .is-1-less-than-or-equal-to-0 {
    color: $fail;
  }
}

@if 1 <= 1 {
  .is-1-less-than-or-equal-to-1 {
    color: $pass;
  }
}

@if 1 <= 2 {
  .is-1-less-than-or-equal-to-2 {
    color: $pass;
  }
}

@if 1 >= 0 {
  .is-1-less-than-or-equal-to-0 {
    color: $pass;
  }
}

@if 1 >= 1 {
  .is-1-less-than-or-equal-to-1 {
    color: $pass;
  }
}

@if 1 >= 2 {
  .is-1-less-than-or-equal-to-2 {
    color: $fail;
  }
}

@for $i from 1 to 5 by 2 {
  .for-$i {
    width: $(i)px;
  }
}

@for $i from 6 to 1 by 2 {
  .for-$i {
    height: $(i)px;
  }
}

@each $i in (foo, bar, baz) {
  .test-$i {
    color: $pass;
  }
}

.phone {
  &_title {
    width: 500px;

    @media (max-width: 500px) {
      width: auto;
    }

    body.is_dark & {
      color: white;

      @at-root {
        .phablet {
          color: $pass;
        }
      }
    }
  }

  img {
    display: block;
  }
}

@define-placeholder foo {
  background: pink;
}

.bar {
  @extend foo;

  background-color: @color;
  color: $pass;
}