@button-border-radius: @border-radius;
@btn-disabled-bg: @color-gray-lighter;
@btn-disabled-border: @color-gray;
@btn-disabled-text: @btn-disabled-border;

.btn {
    display: inline-block;
    padding: 0.5em 1em;
    font-weight: @font-weight-bold;
    line-height: 1.25;
    border-radius: @button-border-radius;

    &:focus, &:hover {
        text-decoration: none;
    }

    &:active, &:focus {
        .tab-focus;
    }

    &:disabled {
        cursor: not-allowed;
        opacity: 0.2;
    }
}

.btn-block {
    display: block;
    width: 100%;
    text-align: center;
}

.btn-sm {
    font-size: @font-size-sm;
}

.btn-lg {
    font-size: @font-size-lg;
}

.btn-xs {
    // padding: @spacer-1;
    // padding-top: 0;
    // padding-bottom: 0;
    font-size: @font-size-xs;
}

.btn-wide {
    padding-left: 2em;
    padding-right: 2em;
}

.btn-primary-outline {
    .button-outline-variant(@color-brand-primary);
}

.btn-inv-outline {
    .button-outline-variant(@color-white);
}

.btn-danger {
    .button-outline-variant(@color-danger);
}

.btn-link {
    font-weight: @font-weight-normal;
    color: @text-dark;
    background-color: transparent;

    &:focus, &:hover {
        color: darken(@text-dark, 15%);
        text-decoration: underline;
    }
}

.btn-pad-lg {
    padding: @spacer-2 @spacer-4;
}

.btn-loading {
    position: relative;
    color: transparent !important;
    &:after {
        position: absolute !important;
        display: block;
        height: 1rem;
        width: 1rem;
        top: 50%;
        left: 50%;
        margin-left: -0.5rem;
        margin-top: -0.5rem;
        border: 2px solid @text-dark;
        border-radius: 0.5rem;
        border-right-color: transparent;
        border-top-color: transparent;
        animation: spin-around 500ms infinite linear;
        content: "";
    }
}

// .button-variant(@color; @background) {
//     @active-background: darken(desaturate(@background, 0%), 10%);

//     color: @color;
//     background-color: @background;
//     background-image: linear-gradient(180deg, rgba(255, 255, 255, 0.25), transparent);
//     border: 1px solid @border-color;
//     font-weight: @font-weight-bold;

//     &:active, &:hover {
//         color: @color;
//         background-color: @active-background;
//         border-color: @active-background;
//     }

//     &:focus {
//         color: @color;
//     }

//     &:disabled {
//         background-color: @btn-disabled-bg;
//         border-color: @btn-disabled-border;
//         color: @btn-disabled-text;

//         background-color: @color-gray-lighter;
//         border-color: @color-black;
//         color: @color-black;
//     }

//     &.btn-loading:after {
//         border-left-color: fade(@color, 70%);
//         border-bottom-color: fade(@color, 70%);
//     }
// }

.button-outline-variant(@color) {
    @inactive-border: lighten(@color, 0%);

    color: @color;
    background-color: transparent;
    border: 1px solid @inactive-border;
    font-weight: @font-weight-normal;

    &:active, &:hover {
        color: @color;
        background-color: fade(@color, 10%);
        border-color: @color;
    }

    &:focus {
        color: @color;
    }

    &:disabled {
        &:active, &:hover {
            border-color: @inactive-border;
        }
    }
}

.btn-variant(@text; @background) {
    @border-color: @background;
    @bottom-border-color: darken(desaturate(@background, 0%), 8%);

    color: @text;
    font-weight: 700;
    background-color: @background;
    border: 1px solid @border-color;
    border-bottom: 1px solid @bottom-border-color;

    & when (lightness(@text) >= 50%) {
        @text-shadow-color: @bottom-border-color;
        text-shadow: 0px -1px @text-shadow-color;
    }
    & when (lightness(@text) < 50%) {
        text-shadow: 0px 1px hsla(255, 255, 255, 0.4);
    }

    &:active, &:hover {
        color: @text;

        background-color: darken(@background, 5%);
        border: 1px solid darken(@border-color, 5%);
        border-bottom: 1px solid darken(@bottom-border-color, 5%);
    }

    // &:focus {
    //     color: @text;
    // }

    &:disabled {
        background-color: @btn-disabled-bg;
        border-color: @btn-disabled-border;
        color: @btn-disabled-text;

        background-color: @color-gray-lighter;
        background-image: none;
        border-color: @color-black;
        color: @color-black;
    }

    &.btn-loading {
        text-shadow: none;
        &:after {
            border-left-color: fade(@text, 70%);
            border-bottom-color: fade(@text, 70%);
        }
        &:disabled {
            color: @text;
            background-color: @background;
            border-color: @border-color;
            border-bottom-color: @bottom-border-color;
            opacity: 0.5;
        }
    }
}

.btn-primary {
    // #36a4e4 dig this color if I go no-gradient
    // hsl(202, 76%, 55%)
    .btn-variant(@color-white; @color-brand-primary);
    .box-shadow;
}

.btn-secondary {
    .btn-variant(@text-dark; @color-gray-lighter);
}