amis/scss/components/form/_nested-select.scss

.#{$ns}NestedSelect {
    display: inline-flex;
    vertical-align: middle;
    outline: none;
    position: relative;
    border: $Form-select-borderWidth solid $Form-select-borderColor;
    background: $Form-select-bg;
    border-radius: $Form-select-borderRadius;
    height: $Form-selectOption-height;
    $paddingY: (
            $Form-selectOption-height - $Form-input-lineHeight *
                $Form-input-fontSize - $Form-select-borderWidth * 2
        )/2;
    padding: $paddingY 0 $paddingY $Form-select-paddingX;
    cursor: pointer;
    color: $Form-select-color;

    &.is-disabled {
        color: $text--muted-color;
        background: $Form-input-onDisabled-bg;
        border-color: $Form-input-onDisabled-borderColor;
    }

    &.is-focused,
    &.is-opened {
        border-color: $Form-input-onFocused-borderColor;
        // border-bottom: 0;

        @if ($Form-select-onFocused-color !=$Form-select-color) {
            color: $Form-select-onFocused-color;
        }
    }

    &.is-opened {
        .#{$ns}Select-arrow:before {
            transform: rotate(180deg);
        }
    }

    &:not(.is-disabled):hover {
        background: $Form-select-onHover-bg;
    }

    &-placeholder {
        color: $Form-select-placeholderColor;
        line-height: $Form-input-lineHeight;
    }

    &-valueWrap {
        user-select: none;
        position: relative;
        flex-grow: 1;
    }

    &-clear {
        padding: px2rem(3px);
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        position: relative;
        z-index: 2;

        svg {
            fill: $Form-input-iconColor;
            width: px2rem(10px);
            height: px2rem(10px);
        }

        &:hover svg {
            fill: darken($color: $Form-input-iconColor, $amount: 20%);
        }
    }

    &-optionArrowRight {
        display: inline-block;
        position: absolute;
        right: px2rem(10px);

        svg {
            width: px2rem(12px);
            height: px2rem(12px);
            fill: $Form-input-iconColor;
        }
    }

    &-menuOuter,
    &-childrenOuter {
        z-index: 10;
        position: absolute;
        background: $Form-select-menu-bg;
        color: $Form-select-menu-color;
        border: $Form-select-outer-borderWidth solid $Form-input-onFocused-borderColor;
        box-shadow: $Form-select-outer-boxShadow;

        .#{$ns}NestedSelect-option {
            position: relative;
            padding-left: px2rem(10px);
            height: $Form-input-height;
            line-height: $Form-input-height;
            cursor: pointer;

            &.is-active {
                color: $Form-select-menu-onActive-color;
                background-color: $Form-select-menu-onActive-bg;
            }

            &:hover {
                color: $Form-select-menu-onHover-color;
                background-color: $Form-select-menu-onHover-bg;
            }

            &:hover > .#{$ns}NestedSelect-childrenOuter {
                display: block;
            }

            .#{$ns}Checkbox {
                display: inline-block;
                padding-top: 0;
            }

            &.checkall {
                border-bottom: px2rem(1px) solid #eceff8;
            }
        }
    }

    &-childrenOuter {
        display: none;
        position: relative;
        width: 100%;
        left: 100%;
        transform: translateY(-$Form-input-height);
        padding: 0;
        margin: 0;
    }
}