@mixin node-state(
    $direction,
    $background,
    $color,
    $dot-size: $s-2
) {
    position: relative;
    #{$timeline-prefix}-item-timeline {
        position: absolute;
        @if $direction == 'rtl' {
            left: auto;
            right: 0;
        } @else {
            left: 0;
        }
        top: 0;
        height: 100%;

        #{$timeline-prefix}-item-node {
            position: relative;
            width: $timeline-item-node-size;
            height: $timeline-item-node-size + $timeline-item-node-padding * 2;
            padding: $timeline-item-node-padding 0;
            text-align: center;
            @if $direction == 'rtl' {
                float: right;
            } @else {
                float: left;
            }
        }

        #{$timeline-prefix}-item-node#{$timeline-prefix}-item-node-custom {
            width: $timeline-item-custom-node-size;
            height: auto;
            font-size: $timeline-item-custom-node-font-size;
            word-break: break-all;
            @if $direction == 'rtl' {
                margin-right: calc(-#{($timeline-item-custom-node-size - $timeline-item-node-size) / 2});
                margin-left: 0;
            } @else {
                margin-left: calc(-#{($timeline-item-custom-node-size - $timeline-item-node-size) / 2});
            }
            line-height: 1;
        }

        #{$timeline-prefix}-item-dot {
            display: block;
            position: absolute;
            width: $dot-size;
            height: $dot-size;
            border-radius: 100%;
            top: 50%;
            margin-top: -$dot-size/2;
            left: 50%;
            margin-left: -$dot-size/2;
        }

        #{$timeline-prefix}-item-icon {
            display: block;
            position: absolute;
            width: $timeline-item-icon-size + 4;
            height: $timeline-item-icon-size + 4;
            line-height: $timeline-item-icon-size + 4;
            border-radius: 100%;
            top: 50%;
            left: 50%;
            margin-top: -$timeline-item-icon-size/2 - 2;
            margin-left: -$timeline-item-icon-size/2 - 2;

            #{$timeline-icon-prefix} {
                @include icon-size($timeline-item-icon-size);
            }
        }

        #{$timeline-prefix}-item-tail {
            position: absolute;
            width: auto;
            height: calc(100% - #{$timeline-item-node-size + 2*$timeline-item-node-padding});
            top: $timeline-item-node-size + 2*$timeline-item-node-padding;
            @if $direction == 'rtl' {
                left: auto;
                right: $timeline-item-node-size/2;
            } @else {
                left: $timeline-item-node-size/2;
            }

            i {
                display: inline-block;
                vertical-align: top;
                height: 100%;
                width: $timeline-item-tail-size;
                position: relative;
                background: $timeline-item-tail-color;
                -webkit-transition: all $motion-duration-immediately $motion-linear;
                transition: all $motion-duration-immediately $motion-linear;
            }
        }
    }

    #{$timeline-prefix}-item-content {
        display: inline-block;
        @if $direction == 'rtl' {
            margin-right: $timeline-item-content-margin-left + $timeline-item-node-size;
            margin-left: 0;
        } @else {
            margin-left: $timeline-item-content-margin-left + $timeline-item-node-size;
        }
        #{$timeline-prefix}-item-title {
            margin: 0;
            font-size: $timeline-item-title-font-size;
            font-weight: $timeline-item-title-font-weight;
            line-height: $timeline-item-title-font-size + 4;
            margin-top: $timeline-item-title-margin-top;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            color: $timeline-item-title-color;
            @if $direction == 'rtl' {
                text-align: right;
            } @else {
                text-align: left;
            }
        }

        #{$timeline-prefix}-item-body {
            margin: 0;
            margin-top: $timeline-item-body-margin-top;
            font-size: $timeline-item-body-font-size;
            line-height: $timeline-item-body-font-size + 4;
            color: $timeline-item-body-color;
            @if $direction == 'rtl' {
                text-align: right;
            } @else {
                text-align: left;
            }
        }

        #{$timeline-prefix}-item-time {
            margin: 0;
            margin-top: $timeline-item-time-margin-top;
            margin-bottom: $timeline-item-time-margin-bottom;
            font-size: $timeline-item-time-font-size;
            color: $timeline-item-time-color;
            @if $direction == 'rtl' {
                text-align: right;
            } @else {
                text-align: left;
            }
        }
    }

    // 时间轴左边存在内容的情况
    &#{$timeline-prefix}-item-has-left-content {
        & > #{$timeline-prefix}-item-left-content {
            position: absolute;
            width: $timeline-item-left-content-width;
            display: inline-block;
            font-size: $timeline-item-left-body-font-size;
            color: $timeline-item-left-body-color;
            line-height: $timeline-item-left-body-font-size + 4;
            margin-top: $timeline-item-title-margin-top;
            @if $direction == 'rtl' {
                text-align: left;
                padding-left: $timeline-item-content-margin-left;
                padding-right: 0;
            } @else {
                text-align: right;
                padding-right: $timeline-item-content-margin-left;
            }
            p {
                word-break: break-word;
            }
        }
        & > #{$timeline-prefix}-item-timeline {
            @if $direction == 'rtl' {
                margin-right: $timeline-item-left-content-width;
                margin-left: 0;
            } @else {
                margin-left: $timeline-item-left-content-width;
            }
        }
        & > #{$timeline-prefix}-item-content {
            @if $direction == 'rtl' {
                margin-right: $timeline-item-left-content-width + $timeline-item-content-margin-left + $timeline-item-node-size;
                margin-left: 0;
            } @else {
                margin-left: $timeline-item-left-content-width + $timeline-item-content-margin-left + $timeline-item-node-size;
            }
        }
    }
    #{$timeline-prefix}-item-dot {
        background: $background;
    }

    #{$timeline-prefix}-item-icon {
        background: $background;
        color: $color;
    }
}