* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

li {
    list-style: none;
}

a {
    text-decoration: none;
    list-style: none;
}

div {
    display: block;
}

.main {
    width: 100%;
    overflow: hidden;
}

.about_tit h3 {
    font-family: "HarmonyOS_Sans_SC_Medium";
    font-size: 46px;
    line-height: 46px;
}

.about_tit .enc {
    font-family: "HarmonyOS_Sans_SC_Light";
    font-size: 18px;
    line-height: 40px;
    color: #666666;
    text-transform: uppercase;
}

.about_box1 .w1400 {
    margin-top: 100px;
    margin-bottom: 120px;
    display: flex;
    flex-wrap: wrap;
}

.about_box1 .l {
    width: 50%;
}

.about_box1 .r {
    width: 50%;
    font-family: "HarmonyOS_Sans_SC_Medium";
    font-size: 16px;
    line-height: 28px;
    color: #666666;
}

.about_box1 .img {
    width: 100%;
}

.about_box1 .img img {
    width: 100%;
    display: block;
}

.about_box2 {
    background: url(../images/about_21.jpg) no-repeat center center;
    background-size: cover;
    overflow: hidden;
}

.about_box2 .w1400 {
    margin-top: 100px;
    margin-bottom: 120px;
    display: flex;
    flex-wrap: wrap;
}

.about_box2 .l {
    width: 280px;
}

.about_box2 .r {
    width: 1070px;
    display: flex;
    flex-wrap: wrap;
}

.about_box2 .r li {
    width: 330px;
    height: 370px;
    background: #ffffff;
    margin-bottom: 40px;
    padding: 40px 30px 0;
    box-sizing: border-box;
    border: 1px solid #eeeeee;
    border-radius: 5px;
    box-shadow: 3px 3px 5px rgba(131, 131, 131, 0.1);
}

.about_box2 .r li:not(:nth-child(3n)) {
    margin-right: 40px;
}

.about_box2 .r li span {
    display: block;
    width: 65px;
    height: 65px;
    margin-bottom: 90px;
}

.about_box2 .r li span img {
    display: block;
}

.about_box2 .r li h3 {
    font-family: "HarmonyOS_Sans_SC_Medium";
    font-size: 26px;
    line-height: 40px;
    color: #444444;
}

.about_box2 .r li p {
    font-family: "HarmonyOS_Sans_SC_Medium";
    font-size: 16px;
    line-height: 24px;
    color: #777777;
    margin-top: 20px;
}

.about_box3 .w1400 {
    margin-top: 100px;
    margin-bottom: 120px;
    display: flex;
    flex-wrap: wrap;
}

.about_box3 .l {
    width: 50%;
}

.about_box3 .l .con {
    font-family: "HarmonyOS_Sans_SC_Medium";
    font-size: 16px;
    line-height: 28px;
    color: #666666;
    margin-top: 70px;
}

.about_box3 .r {
    width: 50%;
    padding-top: 60px;
}

.about_box4 {
    background: url(../images/about_41.jpg) no-repeat center bottom;
    background-size: cover;
    overflow: hidden;
    padding-bottom: 360px;
}

.about_box4 .w1400 {
    margin-top: 100px;
    margin-bottom: 120px;
    display: flex;
    flex-wrap: wrap;
}

.about_box4 .l {
    width: 50%;
}

.about_box4 .r {
    width: 50%;
    font-family: "HarmonyOS_Sans_SC_Medium";
    font-size: 16px;
    line-height: 28px;
    color: #666666;
}

.about_box4 .r .a_more {
    margin-top: 34px;
    width: 170px;
    height: 48px;
    border-radius: 24px;
    border: 1px solid #ff5101;
    overflow: hidden;
    background: #ff5101;
    color: #ffffff;
    position: relative;
    z-index: 3;
    transition: all 0.3s ease;
}

.about_box4 .r .a_more:hover {
    color: #ff5101;
}

.about_box4 .r .a_more .iconfont {
    display: block;
    margin-left: 35px;
    transition: all 0.4s ease;
}

.about_box4 .r .a_more:hover .iconfont {
    margin-left: 40px;
}

.about_box4 .r .a_more::before {
    position: absolute;
    content: "";
    display: block;
    left: -100%;
    width: 100%;
    height: 100%;
    border-radius: 24px;
    z-index: -1;
    transition: all 0.6s ease;
    background: #ffffff;
}

.about_box4 .r .a_more:hover:before {
    left: 0;
}

@media (max-width: 1600px) {
    .about_box1 .w1400 {
        margin-top: 80px;
        margin-bottom: 96px;
    }

    .about_tit h3 {
        font-size: 42px;
    }

    .about_box2 .w1400 {
        margin-top: 80px;
        margin-bottom: 96px;
    }

    .about_box3 .w1400 {
        margin-top: 80px;
        margin-bottom: 96px;
    }

    .about_box4 {
        padding-bottom: 200px;
    }

    .about_tit .enc {
        font-size: 17px;
    }

    .about_box2 .r li {
        width: 315px;
        height: 365px;
        background: #ffffff;
        margin-bottom: 30px;
        padding: 35px 25px 0;
    }

    .about_box2 .r {
        width: 1000px;
    }

    .about_box2 .r li:not(:nth-child(3n)) {
        margin-right: 26px;
    }

    .about_box2 .r li span {
        margin-bottom: 70px;
    }

    .about_box2 .r li h3 {
        font-size: 25px;
        line-height: 36px;
    }

    .about_box2 .r li p {
        font-size: 16px;
        line-height: 23px;
        margin-top: 19px;
    }
}

@media (max-width: 1400px) {
    .about_box1 .w1400 {
        margin-top: 60px;
        margin-bottom: 70px;
    }

    .about_tit h3 {
        font-size: 38px;
    }

    .about_tit .enc {
        font-size: 16px;
    }

    .about_box1 .r {
        font-size: 15px;
    }

    .about_box2 .w1400 {
        margin-top: 60px;
        margin-bottom: 70px;
    }

    .about_box3 .w1400 {
        margin-top: 60px;
        margin-bottom: 70px;
    }

    .about_box2 .r {
        width: 100%;
    }

    .about_box2 .l {
        width: 100%;
        margin-bottom: 20px;
    }

    .about_box3 .r img {
        display: block;
        width: 100%;
    }

    .about_box2 .r li span {
        margin-bottom: 45px;
    }

    .about_box2 .r li h3 {
        font-size: 23px;
        line-height: 27px;
    }

    .about_box2 .r li {
        width: 30%;
        height: 330px;
    }

    .about_box3 .l .con {
        margin-top: 40px;
        line-height: 26px;
    }

    .about_box4 .w1400 {
        margin-top: 60px;
        margin-bottom: 70px;
    }

    .about_box4 {
        padding-bottom: 50px;
    }
}

@media (max-width: 1200px) {
    .about_box1 .w1400 {
        margin-top: 48px;
        margin-bottom: 50px;
    }

    .about_tit h3 {
        font-size: 28px;
        line-height: 38px;
    }

    .about_tit .enc {
        font-size: 16px;
        line-height: 26px;
    }

    .about_box1 .l {
        width: 40%;
    }

    .about_box1 .r {
        width: 60%;
    }

    .about_box2 .w1400 {
        margin-top: 48px;
        margin-bottom: 50px;
    }

    .about_box3 .w1400 {
        margin-top: 48px;
        margin-bottom: 50px;
    }

    .about_box4 .w1400 {
        margin-top: 48px;
        margin-bottom: 50px;
    }

    .about_box4 .l {
        width: 40%;
    }

    .about_box4 .r {
        width: 60%;
    }

    .about_box2 .r li {
        margin-bottom: 20px;
        padding: 20px 15px 0;
    }

    .about_box2 .r li h3 {
        font-size: 21px;
    }

    .about_box2 .r li span {
        margin-bottom: 40px;
    }
}

@media (max-width: 768px) {
    .about_box1 .w1400 {
        margin-top: 30px;
        margin-bottom: 35px;
    }

    .about_tit h3 {
        font-size: 23px;
        line-height: 33px;
    }

    .about_box1 .l {
        width: 100%;
    }

    .about_box1 .r {
        width: 100%;
        margin-top: 20px;
    }

    .about_tit .enc {
        font-size: 15px;
        line-height: 23px;
    }

    .about_box1 .r {
        font-size: 14px;
        line-height: 20px;
    }

    .about_box2 .w1400 {
        margin-top: 30px;
        margin-bottom: 35px;
    }

    .about_box3 .w1400 {
        margin-top: 30px;
        margin-bottom: 35px;
        position: relative;
    }

    .about_box4 .w1400 {
        margin-top: 30px;
        margin-bottom: 35px;
    }

    .about_box2 .r {
        justify-content: space-between;
    }

    .about_box2 .r li {
        width: 49%;
        height: 250px;
    }

    .about_box2 .r li:not(:nth-child(3n)) {
        margin-right: 0px;
    }

    .about_box2 .r li span {
        margin-bottom: 20px;
        height: auto;
    }

    .about_box2 .r li span img {
        display: block;
        width: 45px;
    }

    .about_box2 .r li p {
        font-size: 14px;
        line-height: 20px;
        margin-top: 18px;
    }

    .about_box3 .l .con {
        margin-top: 21px;
        font-size: 14px;
        line-height: 18px;
    }

    .about_box3 .l {
        width: 100%;
    }

    .about_box3 .r {
        position: absolute;
        opacity: 0.5;
        z-index: -1;
        width: 100%;
    }

    .about_box4 .l {
        width: 100%;
        margin-bottom: 20px;
    }

    .about_box4 .r {
        width: 100%;
        font-size: 14px;
    }

    .about_box4 .r .a_more {
        margin-top: 0px;
    }

    .about_box4 {
        padding-bottom: 15px;
    }
}

@media (max-width: 380px) {
    .about_box2 .r li p {
        font-size: 12px;
        line-height: 18px;
        margin-top: 16px;
    }
}