.main {
    margin-bottom: 70px;
}

.sec_nav {
    width: 100%;
    height: 82px;
    background-color: rgb(255, 255, 255);
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    box-sizing: border-box;
    padding: 0px 26px;
}

.sec_nav h2 {
    font-size: 22px;
    font-weight: 700;
    padding-right: 20px;
    border-right: 1px solid rgb(204, 204, 204);
}

.sec_nav ul {
    display: flex;
    margin-left: 20px;
}

.sec_nav ul li {
    font-size: 16px;
    margin-right: 20px;
}

.sec_nav ul li a.active {
    border-bottom: 3px solid rgb(0, 186, 107);
    padding-bottom: 8px;
}

.sec_nav ul li a:hover {
    border-bottom: 3px solid rgb(0, 186, 107);
    padding-bottom: 8px;
}

.content {
    min-height: 730px;
    background-color: rgb(255, 255, 255);
    box-shadow: rgba(4, 0, 0, 0.09) 0px 2px 29px 0px;
    padding: 45px 26px;
    box-sizing: border-box;
}
.introduce{
    display: flex;
    justify-content: space-between;
}
.introduce .left_imgs {
    width: 520px;
    height: 630px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 10px 0;
    box-sizing: border-box;
}

.introduce .right_text {
    width: 590px;
    flex: 1;
    padding: 0 14px 0 40px;
}

.introduce p {
    font-size: 18px;
    color: rgb(77, 77, 77);
    line-height: 42px;
    text-align: justify;
    text-indent: 2em;
}

.plan h4{
    font-size: 24px;
    text-align: center;
    margin: 44px 0;
    font-weight: 700;
}
.plan .con {
    padding: 0 44px;
}
.plan .con p {
    font-size: 18px;
    line-height: 42px;
    color: rgb(77, 77, 77);
    text-align: justify;
    text-indent: 2em;
    margin-bottom: 10px;
}
.imgs{
    display:flex;
    justify-content: center;
}
.imgs .img {
    padding:10px
}
.imgs .img img{
    width:100%
}

@media screen and (max-width: 768px) {
    .main .container {
        display: block;
    }

    .sec_nav ul {
        flex-wrap: wrap;
    }

    .sec_nav ul li {
        margin-bottom: 10px;
    }

    /* .sec_nav ul li a.active {
        padding-bottom: 4px;
    } */

    .sec_nav ul li a:hover {
        border-bottom: none;
        padding: 8px 0px;
    }

    .sec_nav h2 {
        padding-right: 10px;
        margin-right: 10px;
    }
    .sec_nav {
        margin-bottom: 14px;
        padding: 20px 20px 10px;
        height: auto;
    }

    .content{
        padding: 16px 14px;
    }
    .introduce{
        display: block;
        width: 100%;
    }
    .introduce .left_imgs{
        width: 100%;
        display: block;
        height: auto;
    }
    .introduce .left_imgs img{
        width: 100%;
        
    }
    .introduce .right_text{
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;
    }
    .introduce .right_text p{
        font-size: 1.125rem;
        line-height: 2em;
    }
    .plan h4{
        font-size: 1.5rem;
    }
    .plan .con{
        padding: 0 20px;
    }
    .plan .con p{
        font-size: 1.125rem;
        line-height: 2em;
    }
}