@mixin debug($color: red) {
    border: 1px solid $color;
}

@mixin clearfix {
    zoom:1;
    &:before, &:after {
        content: "\0020";
        display: block;
        height: 0;
        overflow: hidden;
    }
    &:after {
        clear: both;
    }
}

@mixin letterpress($opacity) {
    text-shadow: rgba(255, 255, 255, $opacity) 0 1px 0;
}

@mixin hide-text {
    font: 0/0 a;
    text-shadow: none;
    color: transparent;
}

@mixin link-colors($normal, $hover: $normal, $visited: $normal) {
    color: $normal;
    &:hover, &:focus {
        color: $hover;
    }
    &:visited {
        color: $visited;
    }
}