.banner_box {
    width: 100%;
    height: calc(60px + 25rem);
    background: url(../images/gywm.jpg) no-repeat;
    background-size: cover;
    position: relative;
}

.banner {
    max-width: 1420px;
    width: 85%;
    height: 100%;
    margin: auto;
    display: flex;
    flex-direction: column;
    justify-content: center;

}

.banner_nav_box {
    width: 100%;
    border-bottom: 1px #ffffff48 solid;
    position: absolute;
    top: 0;
    height: calc(10px + 2rem);
    display: flex;
    flex-direction: column;
    justify-content: center;

}

.banner_nav {
    max-width: 1420px;
    width: 85%;
    margin: auto;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 0.5rem;
}

.banner_nav div {

    font-family: PINGFANG;
    font-weight: 300;
    font-size: calc(6px + 0.5rem);
    color: #FFFFFF;

}

.banner_text {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
    gap: calc(1px + 0.5rem);
}

.banner_text div:nth-of-type(1) {

    font-family: PINGFANG;
    font-weight: 400;
    font-size: calc(10px + 1.5rem);
    color: #FEFEFE;
}

.banner_text div:nth-of-type(2) {

    font-family: PINGFANG;
    font-weight: 400;
    font-size: calc(10px + 1rem);
    color: #FEFEFE;
}

.nav_box {
    width: 100%;
    height: calc(20px + 3rem);
    background: #FFFFFF;
    box-shadow: 0px 4px 6px 0px rgba(3, 15, 53, 0.05);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.nav {
    max-width: 1420px;
    width: 85%;
    height: 100%;
    margin: auto;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: calc(9px + 10rem);
}

.nav .navItem {
    height: 100%;
    font-family: PINGFANG;
    font-weight: 400;
    font-size: calc(10px + 0.5rem);
    color: #333333;
    display: flex;
    align-items: center;
}
.nav .navItem:hover{
    color: #D21010;
}
.nav a{
    position: relative;
}
.nav a:hover .nav_line{
    width: 100%;
    transition: .5s;
}
.nav_line{
    width: 0;
    height: 1px;
    background-color: #D21010;
    position: absolute;
    bottom: 0;
    left: 0;
}

.nav a {
    height: 100%;
}

.nav a:nth-of-type(3) .navItem {
    color: #D21010;
    border-bottom: 1px #D21010 solid;

}



.industrial_base_box {
    width: 100%;
    margin-top: calc(30px + 5rem);
    margin-bottom: calc(30px + 5rem);
}

.industrial_base {
    max-width: 1420px;
    width: 85%;
    margin: auto;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: calc(4px + 2rem);

}

.industrial_card {
    width: calc(44px + 20rem);
    cursor: pointer;


}

.industrial_card_pic {
    overflow: hidden;
}

.industrial_card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: .5s;

}

.industrial_card img:hover {
    transform: scale(1.2);
}

.industrial_card p {

    font-family: PINGFANG;
    font-weight: 300;
    font-size: calc(8px + 0.5rem);
    color: #434343;
    margin-top: calc(3px + 1rem);
    text-align: center;


}



@media (max-width: 1100px) {
    .banner_nav_box{
        display: none;
    }
    .nav_box {
        overflow-x: scroll;
    }

    .nav {
        width: max-content;
        display: flex;
        justify-content: center;
        align-items: center;
        gap: calc(15px + 1rem);
    }

    .nav a div {
        width: auto;

    }
    .industrial_card{
        width: 47%;
    }
}