<template>  
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    <u-popup  
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        mode="center"  
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        :zoom="zoom"  
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        :show="show"  
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        :customStyle="{  
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            borderRadius: '6px',  
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            overflow: 'hidden',  
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            marginTop: `-${$u.addUnit(negativeTop)}`  
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        }"  
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        :closeOnClickOverlay="closeOnClickOverlay"  
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        :safeAreaInsetBottom="false"  
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        :duration="duration"  
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        @click="clickHandler"  
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    >  
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        <view  
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            class="u-modal"  
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            :style="{  
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                width: $u.addUnit(width),  
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            }"  
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        >  
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            <text  
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                class="u-modal__title"  
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                v-if="title"  
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            >{{ title }}</text>  
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            <view  
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                class="u-modal__content"  
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                :style="{  
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                    paddingTop: `${title ? 12 : 25}px`  
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                }"  
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            >  
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                <slot>  
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                    <text class="u-modal__content__text">{{ content }}</text>  
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                </slot>  
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            </view>  
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            <view  
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                class="u-modal__button-group--confirm-button"  
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                v-if="$slots.confirmButton"  
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            >  
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                <slot name="confirmButton"></slot>  
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            </view>  
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            <template v-else>  
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                <u-line></u-line>  
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                <view  
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                    class="u-modal__button-group"  
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                    :style="{  
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                        flexDirection: buttonReverse ? 'row-reverse' : 'row'  
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                    }"  
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                >  
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                    <view  
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                        class="u-modal__button-group__wrapper u-modal__button-group__wrapper--cancel"  
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                        :hover-stay-time="150"  
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                        hover-class="u-modal__button-group__wrapper--hover"  
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                        :class="[showCancelButton && !showConfirmButton && 'u-modal__button-group__wrapper--only-cancel']"  
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                        v-if="showCancelButton"  
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                        @tap="cancelHandler"  
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                    >  
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                        <text  
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                            class="u-modal__button-group__wrapper__text"  
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                            :style="{  
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                                color: cancelColor  
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                            }"  
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                        >{{ cancelText }}</text>  
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                    </view>  
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                    <u-line  
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                        direction="column"  
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                        v-if="showConfirmButton && showCancelButton"  
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                    ></u-line>  
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                    <view  
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                        class="u-modal__button-group__wrapper u-modal__button-group__wrapper--confirm"  
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                        :hover-stay-time="150"  
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                        hover-class="u-modal__button-group__wrapper--hover"  
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                        :class="[!showCancelButton && showConfirmButton && 'u-modal__button-group__wrapper--only-confirm']"  
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                        v-if="showConfirmButton"  
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                        @tap="confirmHandler"  
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                    >  
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                        <u-loading-icon v-if="loading"></u-loading-icon>  
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                        <text  
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                            v-else  
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                            class="u-modal__button-group__wrapper__text"  
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                            :style="{  
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                                color: confirmColor  
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                            }"  
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                        >{{ confirmText }}</text>  
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                    </view>  
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                </view>  
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            </template>  
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        </view>  
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    </u-popup>  
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</template>  
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<script>  
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    import props from './props.js';  
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    /**  
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     * Modal 模态框  
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     * @description 弹出模态框,常用于消息提示、消息确认、在当前页面内完成特定的交互操作。  
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     * @tutorial https://www.uviewui.com/components/modul.html  
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     * @property {Boolean}            show                是否显示模态框,请赋值给show (默认 false )  
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     * @property {String}            title                标题内容  
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     * @property {String}            content                模态框内容,如传入slot内容,则此参数无效  
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     * @property {String}            confirmText            确认按钮的文字 (默认 '确认' )  
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     * @property {String}            cancelText            取消按钮的文字 (默认 '取消' )  
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     * @property {Boolean}            showConfirmButton    是否显示确认按钮 (默认 true )  
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     * @property {Boolean}            showCancelButton    是否显示取消按钮 (默认 false )  
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     * @property {String}            confirmColor        确认按钮的颜色 (默认 '#2979ff' )  
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     * @property {String}            cancelColor            取消按钮的颜色 (默认 '#606266' )  
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     * @property {Number}            duration            弹窗动画过度时间 (默认 400 )  
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     * @property {Boolean}            buttonReverse        对调确认和取消的位置 (默认 false )  
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     * @property {Boolean}            zoom                是否开启缩放模式 (默认 true )  
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     * @property {Boolean}            asyncClose            是否异步关闭,只对确定按钮有效,见上方说明 (默认 false )  
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     * @property {Boolean}            closeOnClickOverlay    是否允许点击遮罩关闭Modal (默认 false )  
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     * @property {String | Number}    negativeTop            往上偏移的值,给一个负的margin-top,往上偏移,避免和键盘重合的情况,单位任意,数值则默认为px单位 (默认 0 )  
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     * @property {String | Number}    width                modal宽度,不支持百分比,可以数值,px,rpx单位 (默认 '650rpx' )  
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     * @property {String}            confirmButtonShape    确认按钮的样式,如设置,将不会显示取消按钮  
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     * @event {Function} confirm    点击确认按钮时触发  
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     * @event {Function} cancel        点击取消按钮时触发  
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     * @event {Function} close        点击遮罩关闭出发,closeOnClickOverlay为true有效  
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     * @example <u-modal :show="true" title="title" content="content"></u-modal>  
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     */  
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    export default {  
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        name: 'u-modal',  
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        mixins: [uni.$u.mpMixin, uni.$u.mixin, props],  
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        data() {  
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            return {  
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                loading: false  
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            }  
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        },  
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        watch: {  
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            show(n) {  
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                // 为了避免第一次打开modal,又使用了异步关闭的loading  
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                // 第二次打开modal时,loading依然存在的情况  
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                if (n && this.loading) this.loading = false  
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            }  
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        },  
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        methods: {  
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            // 点击确定按钮  
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            confirmHandler() {  
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                // 如果配置了异步关闭,将按钮值为loading状态  
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                if (this.asyncClose) {  
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                    this.loading = true;  
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                }  
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                this.$emit('confirm')  
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            },  
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            // 点击取消按钮  
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            cancelHandler() {  
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                this.$emit('cancel')  
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            },  
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            // 点击遮罩  
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            // 从原理上来说,modal的遮罩点击,并不是真的点击到了遮罩  
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            // 因为modal依赖于popup的中部弹窗类型,中部弹窗比较特殊,虽然有遮罩,但是为了让弹窗内容能flex居中  
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            // 多了一个透明的遮罩,此透明的遮罩会覆盖在灰色的遮罩上,所以实际上是点击不到灰色遮罩的,popup内部在  
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            // 透明遮罩的子元素做了.stop处理,所以点击内容区,也不会导致误触发  
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            clickHandler() {  
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                if (this.closeOnClickOverlay) {  
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                    this.$emit('close')  
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                }  
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            }  
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        }  
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    }  
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</script>  
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<style lang="scss" scoped>  
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    @import "../../libs/css/components.scss";  
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    $u-modal-border-radius: 6px;  
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    .u-modal {  
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        width: 650rpx;  
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        border-radius: $u-modal-border-radius;  
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        overflow: hidden;  
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        &__title {  
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            font-size: 16px;  
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            font-weight: bold;  
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            color: $u-content-color;  
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            text-align: center;  
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            padding-top: 25px;  
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        }  
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        &__content {  
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            padding: 12px 25px 25px 25px;  
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            @include flex;  
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            justify-content: center;  
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            &__text {  
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                font-size: 15px;  
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                color: $u-content-color;  
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                flex: 1;  
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            }  
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        }  
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        &__button-group {  
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            @include flex;  
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            &--confirm-button {  
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                flex-direction: column;  
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                padding: 0px 25px 15px 25px;  
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            }  
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            &__wrapper {  
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                flex: 1;  
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                @include flex;  
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                justify-content: center;  
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                align-items: center;  
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                height: 48px;  
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                &--confirm,  
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                &--only-cancel {  
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                    border-bottom-right-radius: $u-modal-border-radius;  
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                }  
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                &--cancel,  
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                &--only-confirm {  
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                    border-bottom-left-radius: $u-modal-border-radius;  
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                }  
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                &--hover {  
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                    background-color: $u-bg-color;  
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                }  
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                &__text {  
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                    color: $u-content-color;  
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                    font-size: 16px;  
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                    text-align: center;  
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                }  
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            }  
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        }  
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    }  
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</style>  
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