mail/src/sass/blocks/basics/_buttons.scss

// Regular buttons with disabled support
// -------------------------------------------

.btn {
    position: relative;
    display: inline-block;
    padding: 0.5em 0.7em;
    font-size: $font-size-big;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    border: 0;
    border-radius: 0;
    white-space: nowrap;
    user-select: none;
    background-image: none; // Reset unusual Firefox-on-Android default style; see https://github.com/necolas/normalize.css/issues/214
    background-color: $color-main;
    color: $color-main-text;
    transition: background-color 0.3s;
    text-decoration: none;
    font-weight: normal;
    outline: none;
    min-width: 5em;

    & > svg {
        width: 1em;
        height: 1em;
        fill: $color-main-text;

        // for better valignment
        position: relative;
        top: 0.15em;
    }

    &:hover,
    &:focus {
        background-color: lighten($color-main, 10%);
    }

    &:active {
        background-image: none;
        box-shadow: none;
        transform: translateX(2px) translateY(2px);
    }

    &[disabled],
    &[aria-disabled="true"] {
        cursor: not-allowed;
        pointer-events: none; // Future-proof disabling of clicks
        color: $color-white;
        background-color: $color-grey-lighter;
        background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAYAAAAGCAYAAADgzO9IAAAAJUlEQVQIW2NkQABJIPM5lCvJCGMgC4LYIAkUlTAFMB0gjRQaBQCw8go5lVnl5wAAAABJRU5ErkJggg==);

        & > svg {
            fill: $color-white;
        }

        @include scut-hd-bp {
            background-size: 3px 3px;
        }
    }

    // this modifier can be combined with other modifiers, too
    &--big {
        font-size: $font-size-bigger;
    }

    // Invalid button state
    &--invalid {
        background-color: $color-error;
        color: $color-error-text;
        background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAYAAAAGCAYAAADgzO9IAAAAJUlEQVQIW2NkQABJIPM5lCvJCGMgC4LYIAkUlTAFMB0gjRQaBQCw8go5lVnl5wAAAABJRU5ErkJggg==);

        & > svg {
            fill: $color-error-text;
        }

        @include scut-hd-bp {
            background-size: 3px 3px;
        }

        &:hover,
        &:focus {
            background-color: lighten($color-error, 5%);
        }
    }

    // Secondary button
    &--secondary {
        background-color: $color-grey-input;

        &:hover,
        &:focus {
            background-color: lighten($color-grey-input, 10%);
        }
    }

    // Small lightweight button
    &--light {
        height: 2em;
        padding: 0.3em 0.5em;
        font-size: $font-size-base;
        border: 1px solid $color-main;
        background: transparent;
        color: $color-main;

        & > svg {
            fill: $color-main;
        }

        &:hover,
        &:focus {
            background-color: rgba($color-main, 0.1);
        }

        &[disabled],
        &[aria-disabled="true"] {
            color: $color-grey;
            border-color: $color-grey;
            background: transparent;

            & > svg {
                fill: $color-grey;
            }
        }
    }

    // Small lightweight dropdown button
    &--light-dropdown {
        height: 2em;
        padding: 0.3em 0.5em;
        font-size: $font-size-base;
        border: 1px solid $color-main;
        background: transparent;
        color: $color-main;
        text-align: left;
        min-width: 0;

        & > svg {
            fill: $color-main;
        }

        .btn__dropdown {
            margin-left: 0.75em;
            top: 0.2em; // optimized valignment
        }

        &:hover,
        &:focus {
            background-color: rgba($color-main, 0.1);
        }

        &[disabled],
        &[aria-disabled="true"] {
            color: $color-grey;
            border-color: $color-grey;
            background: transparent;

            & > svg {
                fill: $color-grey;
            }
        }


        // special class if icon button is used as dropdown
        &.wo-dropdown-active {
            background-color: $color-main;
            color: $color-main-text;
            & > svg {
                fill: $color-main-text;
            }
        }
    }
}

.btn-navicon {
    background: transparent;
    border: 0;
    border-radius: 0;
    padding: 0;
    margin: 0;
    outline: 0;

    & > svg {
        fill: $color-blue;
        width: 2em;
        height: 2em;
        vertical-align: middle;
    }
}

// Icon Button
// -------------------------------------------

.btn-icon {
    position: relative;
    display: inline-block;
    margin: 0;
    padding: 0;
    border: 2px solid $color-main;
    border-radius: 50%;
    vertical-align: middle;
    cursor: pointer;
    white-space: nowrap;
    user-select: none;
    background-image: none; // Reset unusual Firefox-on-Android default style; see https://github.com/necolas/normalize.css/issues/214
    text-decoration: none;
    font-weight: normal;
    font-size: $font-size-base;
    background: transparent;
    line-height: 1;
    height: 2.7em;
    width: 2.7em;
    text-align: center;
    outline: none;
    -webkit-font-smoothing: antialiased;

    & > svg {
        width: 1.05em;
        height: 1.05em;
        fill: $color-main;
        vertical-align: middle;
        margin-top: -0.1em; // optimize valignment
    }

    &--disabled,
    &[disabled],
    &[aria-disabled="true"] {
        cursor: not-allowed;
        pointer-events: none; // Future-proof disabling of clicks
        color: $color-grey;
        box-shadow: 0 0 0 2px $color-grey;
        & > svg {
            fill: $color-grey;
        }
    }

    &:active {
        transform: translateX(2px) translateY(2px);
    }

    &:hover,
    &:focus {
        background-color: rgba($color-main, 0.1);
    }

    // special class if icon button is used as dropdown
    &.wo-dropdown-active {
        background-color: $color-main;
        color: $color-main-text;
        & > svg {
            fill: $color-main-text;
        }
    }
}

// Light icon button without any border
// -------------------------------------------

.btn-icon-light {
    position: relative;
    display: inline-block;
    background: transparent;
    border-radius: 0;
    border: 0;
    padding: 0;
    margin: 0;
    font-size: $font-size-base;
    transition: opacity 0.3s;
    outline: 0;

    & > svg {
        width: 1.5em;
        height: 1.5em;
        fill: $color-main;
    }

    &--disabled,
    &[disabled],
    &[aria-disabled="true"] {
        cursor: not-allowed;
        pointer-events: none; // Future-proof disabling of clicks
        & > svg {
            fill: $color-text-light;
        }
    }

    &:active {
        transform: translateX(1px) translateY(1px);
    }
}

// Very small and light icon button without any border
// -------------------------------------------

.btn-icon-very-light {
    position: relative;
    display: inline-block;
    background: transparent;
    border-radius: 0;
    border: 0;
    padding: 0;
    margin: 0;
    font-size: $font-size-small;
    opacity: 0.5;
    outline: 0;

    &:focus,
    &:hover {
        opacity: 1;
    }

    & > svg {
        width: 1em;
        height: 1em;
        fill: $color-text-light;
    }

    &--disabled,
    &[disabled],
    &[aria-disabled="true"] {
        display: none;
    }

    &:active {
        transform: translateX(1px) translateY(1px);
    }
}