// default buttons
.nk-btn {
    position: relative;
    display: inline-block;
    padding: 12px 30px;
    font-family: $font_buttons;
    font-size: .9rem;
    font-weight: 600;
    line-height: 1.2;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    background-color: rgba($color_dark_1, .9);
    border: none;
    border-radius: 2px;
    transition: .2s box-shadow, .2s background-color, .2s color, .2s transform;

    &,
    &:hover,
    &.hover,
    &:active,
    &.active,
    &:focus {
        color: inherit;
        text-decoration: none;
    }
    &:hover,
    &.hover {
        background-color: $color_dark_1;
        box-shadow: 0 5px 15px 0 rgba($color_dark_1, .4);
        transform: translateY(-2px);
    }

    &::before {
        content: "";
        position: absolute;
        display: block;
        top: 4px;
        right: 4px;
        bottom: 4px;
        left: 4px;
        border: 1px solid;
        border-radius: 2px;
        transition: .3s background-color, .3s border-color;
        z-index: 1;
    }
}

// icons
.nk-btn > .icon {
    margin-right: 4px;
    font-size: .8rem;
    vertical-align: middle;
}
.nk-btn > span + .icon {
    margin-right: 0;
    margin-left: 4px;
}
.nk-btn-icon {
    padding: 12px;
    .icon {
        display: inline-block;
        min-width: 18px;
        margin: 0;
    }
}

// sizes
.nk-btn-xs {
    padding: 8px 21px;
    font-size: .8rem;
    &.nk-btn-icon {
        padding: 8px;
    }
}
.nk-btn-sm {
    padding: 11px 24px;
    font-size: .85rem;
    &.nk-btn-icon {
        padding: 10px;
    }
}
.nk-btn-lg {
    padding: 14px 36px;
    &.nk-btn-icon {
        padding: 14px;
    }
}
.nk-btn-x2 {
    padding: 16px 40px;
    font-size: 1rem;
    &.nk-btn-icon {
        padding: 16px;
    }
}
.nk-btn-x3 {
    padding: 20px 50px;
    font-size: 1.1rem;
    &.nk-btn-icon {
        padding: 20px;
    }
}
.nk-btn-x4 {
    padding: 22px 60px;
    font-size: 1.2rem;
    &.nk-btn-icon {
        padding: 22px;
    }
}

// colors
@each $name, $color in $colors {
    .nk-btn-color-#{$name} {
        &,
        &::after,
        &::before {
            border-color: darken($color, 10%);
        }

        color: $color;

        &:hover,
        &.hover {
            color: $color;
        }

        &:active,
        &.active {
            color: darken($color, 20%);
        }
    }
}
@each $name, $color in $colors {
    .nk-btn-bg-#{$name} {
        background-color: rgba($color, .9);

        &:hover,
        &.hover {
            background-color: $color;
        }
    }
}

// circle
.nk-btn-circle,
.nk-btn-circle::after,
.nk-btn-circle::before {
    border-radius: 25px;
    &.nk-btn-xs {
        border-radius: 20px;
    }
    &.nk-btn-sm {
        border-radius: 23px;
    }
    &.nk-btn-lg {
        border-radius: 27px;
    }
    &.nk-btn-x2 {
        border-radius: 30px;
    }
    &.nk-btn-x3 {
        border-radius: 34.5px;
    }
    &.nk-btn-x4 {
        border-radius: 38px;
    }
}

// block
.nk-btn-block {
    display: block;
    width: 100%;
}