.banner_box {
    width: 100%;
    height: calc(60px + 25rem);
    background: url(../images/hxjs.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(1) .navItem {
    color: #D21010;
    border-bottom: 1px #D21010 solid;

}

.about_wmty_box {
    width: 100%;
    height: calc(65px + 50rem);
    background: url(../images/zjbg2.png) no-repeat;
    background-size: cover;
    padding-top: calc(38px + 5rem);
    position: relative;
}


.core_tec_box {
    width: 100%;
}

.core_tec {
    max-width: 1420px;
    width: 85%;
    margin: auto;
}

.core_tec_title {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    gap: calc(4px + 0.5rem);
    margin-top: calc(29px + 5rem);
    margin-bottom: calc(1px + 3rem);
}

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

    font-family: PINGFANG;
    font-weight: 400;
    font-size: calc(2px + 1rem);
    color: #D21010;

}

.core_tec_title div:nth-of-type(2) {
    font-family: PINGFANG;
    font-weight: 600;
    font-size: calc(10px + 1rem);
    color: #333333;
    line-height: 44px;
}

.core_tec_card_box {
    width: 100%;
    margin: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: calc(53px + 5rem);

}

.core_tec_card {
    width: 23.6%;
    position: relative;
}

.core_tec_card img {
    width: 100%;
    object-fit: cover;
}

.core_tec_card_name {
    width: 100%;
    padding: calc(10px + 0.5rem) calc(15px + 0.5rem);
    position: absolute;
    bottom: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1;
    border-top: 1px #EEEEEE solid;
    cursor: pointer;
}

.core_tec_card_name div {

    font-family: PINGFANG;
    font-weight: 400;
    font-size: calc(6px + 1rem);
    color: #FFFFFF;
}



.core_tec_card:hover .core_tec_card_name {
    color: #D21010;
    transition: .5s;
}

.core_tec_card:hover .core_tec_card_name div {
    color: #D21010;
    transition: .5s;
}

.core_tec_card_line {
    width: 0;
    height: 1px;
    background-color: #D21010;
    position: absolute;
    bottom: 100%;
    left: 0;
}

.core_tec_card:hover .core_tec_card_line {
    width: 100%;
    transition: .5s;
}

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

    .core_tec_title div:nth-of-type(1) {
        font-size: calc(10px + 1rem);
    }

    .core_tec_title div:nth-of-type(2) {
        font-size: calc(12px + 1rem);
        text-align: center;
        line-height: calc(10px + 3rem);
    }

    .core_tec_card {
        width: 47%;
    }

    .core_tec_card_name {
        padding: 0;
        display: flex;
        justify-content: center;
        gap: 3px;
    }

    .core_tec_card_name div {
        font-size: calc(9px + 1rem);

    }

    .core_tec_card_name div:nth-of-type(2) {
        display: none;
    }
}