.section4 {
        padding-left: var(--container);
        padding-right: var(--container);
    }

    .section4 .indexTitle {
        width: 75%;
        margin: 0 auto;
    }

    .section4 .indexTitle h2 {
        text-align: left;
    }

    .Box4 {
        margin-top: 45px;
        position: relative;
        width: 100%;
        z-index: 2;
    }


    .shuzhi {
        margin: 0 auto;
        width: 75%;
        display: flex;
    }

    .shuzhi li {
        width: 100%;
    }

    .shuzhi h1 {
        border-bottom: 1px solid #000;
        padding-bottom: 30px;
        margin-bottom: 30px;
        display: flex;
        align-items: baseline;
        justify-content: center;
    }

    .shuzhi li:hover h1 * {
        color: var(--color);
    }

    .shuzhi h1 p {
        font-weight: 700;
        font-size: 62px;
        line-height: 1;
        color: #000000;
    }

    .shuzhi h1 b {
        font-weight: 700;
        font-size: 32px;
        line-height: 1;
        color: #000000;
    }

    .shuzhi h2 {
        font-weight: 700;
        font-size: 16px;
        line-height: 1.5;
        text-align: center;
        color: #000000;
    }

    .shuzhi h3 {
        font-size: 16px;
        line-height: 1.5;
        text-align: center;
        color: #4A4A4A;
    }

    .video4Box {
        margin-top: 90px;
        position: relative;
        z-index: 2;
    }

    .icon4 {
        position: absolute;
        z-index: 2;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        display: flex;
        align-items: center;
        justify-content: center;
        background: rgba(0, 0, 0, 0.3);
    }

    .video4 {
        position: relative;
        z-index: 1;
        width: 100%;
        display: block;
    }

    @media (max-width: 1200px) {
        .section4 .indexTitle {
            width: 100%;
            margin: 0 auto;
        }
        .shuzhi {
            width: 100%;
        }

        .shuzhi h1 {
            padding-bottom: 15px;
            margin-bottom: 15px;
        }

        .shuzhi h1 p {
            font-size: 48px;
        }

        .shuzhi h3,
        .shuzhi h2 {
            font-size: 14px;
        }

        .video4Box {
            margin-top: 30px;
        }
    }

    @media (max-width: 720px) {
        .shuzhi {
            display: flex;
            flex-wrap: wrap;
            grid-gap: 45px 0;
        }

        .shuzhi li {
            width: 50%;
        }

        .shuzhi h1 p {
            font-size: 38px;
        }

        .shuzhi h1 b {
            font-size: 24px;
        }

        .icon4 img {
            width: 45px;
        }
    }

    @media (max-width: 460px) {}

    @media (max-width: 380px) {}