_layout.scss

@include exports("button/layout") {

    // Button
    .k-button {
        box-sizing: border-box;
        border-width: $kendo-button-border-width;
        border-style: solid;
        border-radius: $kendo-button-border-radius;
        color: inherit;
        background: none;
        font-family: $kendo-button-font-family;
        text-align: center;
        text-decoration: none;
        white-space: nowrap;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: $icon-spacing;
        vertical-align: middle;
        user-select: none;
        cursor: pointer;
        outline: none;
        -webkit-appearance: none;
        position: relative;
        transition: $kendo-button-transition;

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        &:disabled,
        &.k-disabled {
            @include disabled( $disabled-styling );
        }

        &::-moz-focus-inner {
            padding: 0;
            border: 0;
            outline: 0;
        }

        &:hover,
        &:focus {
            text-decoration: none;
            outline: 0;
        }
    }


    // Icon Button
    .k-icon-button {
        gap: 0;

        .k-icon {
            display: inline-flex;
        }
    }


    // Content
    .k-button-icon {
        color: inherit;
        align-self: center;
        position: relative;
    }

    .k-button-text {}


    // Button arrow
    .k-button-arrow {
        padding-left: $kendo-button-arrow-padding-x;
        padding-right: $kendo-button-arrow-padding-x;
        flex: none;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }
    .k-button > .k-button-arrow {
        margin-inline-start: -$kendo-button-arrow-padding-x;
        margin-inline-end: -$kendo-button-padding-x;
    }
    .k-icon-button > .k-button-arrow {
        margin-inline-start: 0;
        margin-inline-end: -$kendo-button-padding-y;
    }


    // Sizes
    .k-button-sm {
        padding: $kendo-button-padding-y-sm $kendo-button-padding-x-sm;
        font-size: $kendo-button-font-size-sm;
        line-height: $kendo-button-line-height-sm;
    }
    .k-button-md {
        padding: $kendo-button-padding-y-md $kendo-button-padding-x-md;
        font-size: $kendo-button-font-size-md;
        line-height: $kendo-button-line-height-md;
    }
    .k-button-lg {
        padding: $kendo-button-padding-y-lg $kendo-button-padding-x-lg;
        font-size: $kendo-button-font-size-lg;
        line-height: $kendo-button-line-height-lg;
    }

    .k-icon-button.k-button-sm {
        padding: $kendo-button-padding-y-sm;

        > .k-button-icon {
            min-width: calc( #{$kendo-button-font-size-sm} * #{$kendo-button-line-height-sm} );
            min-height: calc( #{$kendo-button-font-size-sm} * #{$kendo-button-line-height-sm} );
        }
    }
    .k-icon-button.k-button-md {
        padding: $kendo-button-padding-y-md;

        > .k-button-icon {
            min-width: calc( #{$kendo-button-font-size-md} * #{$kendo-button-line-height-md} );
            min-height: calc( #{$kendo-button-font-size-md} * #{$kendo-button-line-height-md} );
        }
    }
    .k-icon-button.k-button-lg {
        padding: $kendo-button-padding-y-lg;

        > .k-button-icon {
            min-width: calc( #{$kendo-button-font-size-lg} * #{$kendo-button-line-height-lg} );
            min-height: calc( #{$kendo-button-font-size-lg} * #{$kendo-button-line-height-lg} );
        }
    }


    // Button shape
    .k-button-square {
        aspect-ratio: 1;
    }


    // Menu button
    .k-menu-button,
    .k-dropdown-button {
        aspect-ratio: auto;
        outline: 0;
        display: inline-flex;
        flex-flow: row nowrap;
        vertical-align: middle;
    }


    // Button group
    .k-button-group {
        margin: 0;
        padding: 0;
        border-width: 0;
        box-sizing: border-box;
        list-style: none;
        outline: 0;
        display: inline-flex;
        flex-flow: row nowrap;
        vertical-align: middle;
        position: relative;
        -webkit-touch-callout: none;
        -webkit-tap-highlight-color: $rgba-transparent;

        > .k-button + .k-button {
            margin-inline-start: if( $kendo-button-border-width == 0, null, -$kendo-button-border-width );
        }

        > .k-button:hover,
        > .k-button.k-hover,
        > .k-button:focus,
        > .k-button.k-focus,
        > .k-button:active,
        > .k-button.k-active,
        > .k-button.k-selected {
            z-index: 2;
        }

        .k-button:not(:first-child):not(:last-child) {
            border-start-end-radius: 0;
            border-end-end-radius: 0;
            border-start-start-radius: 0;
            border-end-start-radius: 0;
        }
        > .k-button:first-child:not(:only-child) {
            border-start-end-radius: 0;
            border-end-end-radius: 0;
        }
        > .k-button:last-child:not(:only-child) {
            border-start-start-radius: 0;
            border-end-start-radius: 0;
        }

        &:disabled,
        &[disabled],
        &.k-disabled {
            opacity: 1;
            filter: none;
        }
    }

    .k-button-group-stretched {
        width: 100%;

        > * {
            flex: 1 0 0%;
            overflow: hidden;
        }
    }


    // Split button
    .k-split-button {

        .k-split-button-arrow {
            padding: $kendo-button-arrow-padding-y $kendo-button-arrow-padding-x;
            width: auto;
            aspect-ratio: auto;
            flex: none;

            &.k-button-sm {
                padding: $kendo-button-arrow-padding-y-sm $kendo-button-arrow-padding-x-sm;
            }

            &.k-button-md {
                padding: $kendo-button-arrow-padding-y-md $kendo-button-arrow-padding-x-md;
            }

            &.k-button-lg {
                padding: $kendo-button-arrow-padding-y-lg $kendo-button-arrow-padding-x-lg;
            }

            .k-button-icon {
                min-width: 0;
            }
        }
    }


    // Flat button
    .k-button-flat {
        border-color: transparent !important; // sass-lint:disable-line no-important
        color: inherit;
        background: none !important; // sass-lint:disable-line no-important
        box-shadow: none !important; // sass-lint:disable-line no-important

        // Overlay background
        &::before {
            display: block !important; // sass-lint:disable-line no-important
        }

        // Focus ring
        &::after {
            box-shadow: inset 0 0 0 2px currentColor;
            display: block !important; // sass-lint:disable-line no-important
        }

        &:focus::after,
        &.k-focus::after {
            opacity: .12;
        }
    }


    // Outline button
    .k-button-outline {
        border-color: currentColor;
        color: inherit;
        background: none;
    }


    // Link button
    .k-button-link {
        border-color: transparent;
        color: inherit;
        text-decoration: none;
        background: none;

        &:hover,
        &.k-hover {
            text-decoration: underline;
        }
    }


    // Clear button
    .k-button-clear {
        border-color: transparent !important; // sass-lint:disable-line no-important
        color: inherit;
        background: none !important; // sass-lint:disable-line no-important
        box-shadow: none !important; // sass-lint:disable-line no-important
    }



    // IE
    .k-ie .k-button-group,
    .k-ie .k-split-button {
        .k-button {
            @include border-radius( 0 );
        }
    }

}




@include exports( "button/layout/overlay" ) {

    // Button overlay
    .k-button-overlay {
        @include border-radius( inherit );
        content: "";
        background: currentColor;
        opacity: 0;
        display: none;
        pointer-events: none;
        position: absolute;
        left: -$kendo-button-border-width;
        right: -$kendo-button-border-width;
        top: -$kendo-button-border-width;
        bottom: -$kendo-button-border-width;
        z-index: 0;
        transition: opacity .2s ease-in-out;
    }


    .k-button {

        &::before {
            @extend .k-button-overlay;
        }

        // Hovered state
        &:hover,
        &.k-hover {
            &::before {
                opacity: $kendo-flat-button-hover-opacity;
            }
        }

        // Focused state
        &:focus,
        &.k-focus {
            &::before {
                opacity: $kendo-flat-button-focus-opacity;
            }
        }
        &.k-no-focus:not(:hover),
        &.k-no-focus:not(.k-hover) {
            &::before {
                opacity: 0;
            }
        }

        // Active state
        &:active,
        &.k-active {
            &::before {
                opacity: $kendo-flat-button-active-opacity;
            }
        }

        // Selected state
        &.k-selected {
            &::before {
                opacity: $kendo-flat-button-selected-opacity;
            }
        }

    }

}




@include exports( "button/layout/focus-ring" ) {

    .k-button {

        &::after {
            @include border-radius( inherit );
            content: "";
            opacity: 0;
            display: none;
            pointer-events: none;
            position: absolute;
            left: -$kendo-button-border-width;
            right: -$kendo-button-border-width;
            top: -$kendo-button-border-width;
            bottom: -$kendo-button-border-width;
            z-index: 0;
            transition: opacity .2s ease-in-out;
        }
    }
}