.ytht-history-main {
    padding-top: 40px;
    /*padding-bottom: 60px;*/
    /*padding-bottom: 120px;*/
}

.history h3 {
    font-size: 30px;
    color: #333;
    text-align: center;
    font-weight: bold;
}

.history .list {
    position: relative;
    width: 100%;
    margin: 40px 0 0 0;
    box-sizing: border-box;
    margin-top: 300px;
    /*top: 100px;*/
    top: -25px;
    padding: 30px;
}

.history .item:nth-child(2n + 2) {
    top: -200px;
}

.history .item:nth-child(2n + 1) {
    margin-top: -300px;
}

.history .item:first-child {

}

.history .item {
    position: relative;
    width: 100%;
    /*padding: 36px 0;*/
    /*padding: 70px 0;*/
    box-sizing: border-box;
}

.history .item::after {
    display: block;
    content: " ";
    clear: both;
}

.history .item::before {
    content: "";
    position: absolute;
    width: 1px;
    top: 0;
    bottom: 0;
    left: 50%;
    background-color: #dfdfdf;
    height: 100%;
}

.history .item .content {
    float: left;
    position: relative;
    margin: 10px 0;
    width: calc(50% - 62px);
    padding: 30px;
    border: 1px solid #dfdfdf;
    box-sizing: border-box;
    border-radius: 10px;
}

.history .item .content::before {
    content: "";
    position: absolute;
    width: 63px;
    height: 9px;
    top: 39px;
    right: -64px;
    background: url(./pics/ibg5.png) no-repeat;
}

.history .item .content p {
    font-size: 17px;
    color: #555;
    line-height: 24px;
    font-weight: bold;
    text-align: center;
}

.history .item .content p ~ p {
    margin-top: 10px;
}

.history .item .data_block {
    /*position: absolute;*/
    position: relative;
    /*left: calc(50% + 62px);*/
    /*top: 40px;*/
    display: flex;
    flex-direction: column;
    align-items: end;
    width: calc(50% - 62px);
}

.history .item .data_block img {
    /*width: 75%;*/
}

.history .item .date {
    /*position: absolute;*/
    /*left: calc(50% + 62px);*/
    /*top: 63px;*/
    margin-bottom: 20px;
    border-radius: 30px;
    width: 150px;
    height: 36px;
    line-height: 36px;
    background: var(--color-primary);
    text-align: center;
    box-sizing: border-box;
    text-align: center;
    color: #202020;
    font-size: 20px;
    color: #fff;
}

.history .item:nth-child(2n + 2) .content {
    float: right;
}

.history .item:nth-child(2n + 2) .content::before {
    right: auto;
    left: -63px;
    background: url(./pics/ibg6.png) no-repeat;
}

/*.history .item:nth-child(2n + 2) .date {*/
/*  left: auto;*/
/*  right: calc(50% + 62px);*/
/*}*/

.history .item:nth-child(2n + 2) .data_block {
    left: auto;
    /*right: calc(50% + 62px);*/
    left: calc(50% + 62px);
    align-items: start;
}

@media screen and (max-width: 1200px) {
    .history .item .data_block img {
        width: 100%;
    }
}

@media screen and (max-width: 768px) {
    .history .item:nth-child(2n + 2) {
        top: 0;
    }
    .history .item:nth-child(2n + 1){
        margin-top: 0;
    }
    .main {
        padding-top: 25px;
        padding-bottom: 30px;
    }

    .ytht-history-main {
        padding-bottom: 40px;
    }

    .history .list {
        margin: 30px 0 0 0;
        top: 0;
        padding: 0;
    }

    .history .item {
        padding: 20px 0;
    }

    .history .item::before {
        left: 10px;
    }

    .history .item .content {
        float: none;
        width: 100%;
        padding: 15px 0 0 30px;
        border: none;
    }

    .history .item .content::before {
        display: none;
    }

    .history .item .content p {
        font-size: 16px;
        line-height: 22px;
    }

    .history .item .data_block {
        position: static;
        width: 100%;
        align-items: start;
    }

    .history .item .data_block img {
        padding: 20px 30px 0;
    }

    .history .item .date {
        margin: 0 0 0 30px;
        position: static;
        left: auto;
        top: auto;
        border-radius: 30px;
        width: 130px;
        height: 32px;
        line-height: 32px;
        font-size: 18px;
        position: relative;
    }

    .history .item .date::before {
        content: "";
        position: absolute;
        width: 62px;
        height: 9px;
        top: 12px;
        left: -24px;
        background: url(../images/ibg6.png) no-repeat;
        z-index: -1;
    }

    .history .item:nth-child(2n + 2) .content {
        float: none;
    }

    .history .item:nth-child(2n + 2) .date {
        right: auto;
    }
}