.arc-arc {
    padding-bottom: 20px;
}

.arc-line img {
    width: 100%;
}

.arc-right {
    display: none;
}

.arc-arc p {
    font: 400 14px/24px "微软雅黑";
    color: #000;
    text-align: justify;
}

.arc-arc p img {
    max-width: 100%;
}

@media (min-width: 1200px) {
    .arc-arc {
        position: relative;
        padding: 0 70px;
        background: none;
        border: 0;
    }

    .arc-line img {
        width: auto;
    }

    .arc-box {
        position: relative;
        margin: 40px 0 0;
        padding: 0 0 70px 120px;
    }

    .common-nav {
        position: absolute;
        left: 0;
        top: 0;
        width: 90px;
    }

    .common-nav ul {
        justify-content: flex-start;
    }

    .common-nav ul li {
        width: 50%;
        padding: 0 18px 18px 0;
    }

    .common-nav ul li a {
        display: flex;
        justify-content: center;
        align-items: center;
        width: 36px;
        height: 108px;
        padding: 0 5px;
        font: bold 16px/1 '微软雅黑';
        color: #000;
        text-align: center;
        border: 3px solid #000;
    }

    .common-nav ul li a:hover {
        color: #fff;
        background: #99020a;
        border-color: #bc454b;
    }

    .arc-p {
        min-height: 400px;
        padding-right: 180px;
        padding-bottom: 70px;
        text-align: justify;
        border-bottom: 1px solid #000;
    }

    .arc-p p {
        font: 400 16px/30px "微软雅黑";
        color: #000;
    }

    .arc-right {
        display: block;
        position: absolute;
        left: 970px;
        top: 0;
        width: 120px;
        height: 100%;
        padding: 0 0 0 25px;
        border-left: 1px solid #000;
    }

    .arc-arc p {
        font: 400 16px/30px "微软雅黑";
    }
}