body{
    margin: 0;
    padding: 0;
}
.headdiv{
    width: 100%;
    height: 10%;
    background-color: #120b1f;
}
.back{
    width: 20%;
    height: 10%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 100;
}
.bottom{
    height: 80px;
    background-color: #120b1f;
    line-height: 80px;
    text-align: center;
}
.bottom a{
    color: #7a7a7a;
    font-size: 13px;
    text-decoration: none;
}
.maindiv{
    width: 100%;
    height: 100vh;

}
.topdiv{
    width: 100%;
    min-height: 10%;
}
.topdiv img{
    display: block;
    width: 100%;
}
.imgback{
    width: 100%;
    height: 100%;
    position: absolute;
    z-index: 100;
}
.logo{
    width: 8%;
    position: absolute;
    top: 3%;
    left: 5%;
}
.logo img{
    width: 100%;
}
.menu{
    width: 30%;
    position: absolute;
    top: 4%;
    right: 5%;
    display: flex;
    z-index: 999;
    text-align: center;
}
.menu-item{
    width: 25%;
    color: #ffffff;
    font-family: "黑体";
}

.menu-item1{
    width: 25%;
    color: #009ce5;
    font-family: "黑体";

}

.menu-item1:hover{
    color: #ffffff;
}
.menu-item:hover{
    color: #009ce5;
}

a{
    text-decoration: none;
}


.customer-title{
    width: 90%;
    margin: 20px auto 0 auto;
    text-align: center;
    line-height: 80px;
    font-size: 32px;
    font-weight: 500;
    letter-spacing: 0.1em;
}
.customer-sub-title{
    width: 90%;
    margin: 0 auto;
    text-align: center;
    line-height: 40px;
    font-size: 20px;
    color: #909090;
}
.contact-list{
    width: 80%;
    margin: 10px auto;
    min-height: 100px;
    display: flex;
    padding-top: 30px;
    padding-bottom: 60px;
}
.contact-item{
    width: 33%;
    display: flex;
}
.contact-icon{
    width: 20%;
    text-align: center;
}
.contact-item img{
    width: 50%
}

.contact-text{
    width: 80%;
    line-height: 30px;
}

.menu-icon{
    display: none;
}
.mobile-menu-list{
    display: none;
}
@media screen and (max-width: 750px) {
    .back{
        display: none;
    }

    .logoback{
        display: none;
    }
    .logo{
        width: 30%;
        position: absolute;
        top: 2%;
        left: 5%;
        z-index: 99
    }
    .menu{
        display: none;
    }
    .menu-icon{
        display: block;
        width: 20%;
        position: absolute;
        top: 2%;
        right: 3%;
        z-index: 999;
        text-align: center;
        font-size: 12px;
    }
    .menu-icon-img{
        width: 40%;
        margin-left: 30%;
    }
    .menu-icon img{
        width: 100%;
    }
    .mobile-menu-list{
        display: none;
        width: 20%;
        position: absolute;
        top: 7%;
        right: 3%;
        z-index: 999;
        text-align: center;
        font-size: 16px;
        background-color: #120b1f;
        padding-bottom: 15px;
    }
    .mobile-menu-item{
        display: block;
        line-height: 35px;
        color: #ffffff;
    }

    .swiper-container .swiper-wrapper .swiper-slide{
        width: 80%;
        display: flex;
    }
    .headdiv{
         width: 100%;
         height: 8%;
         background-color: #120b1f;
     }
    .bottom{
        position: fixed;
        bottom: 0;
        background-color: #120b1f;
        width: 100%;
        text-align: center;
        height: 8%;
        display:table;
        line-height:  8%;
    }
    .bottom a{
        color: #4e375a;
        font-size: 11px;
        text-decoration: none;
        vertical-align:middle;
        display:table-cell;
    }
    .customerback{
        display: none;
    }
    .imgback{
        display: none;
    }
    .customer-list{
        width: 90%;
        margin: 0 auto;
        min-height: 100px;
        display: flex;
        flex-wrap: wrap;
        padding-bottom: 100px;
    }
    .customer-item{
        width: 32%;
        margin-left: 0.5%;
        margin-right: 0.5%;
    }
    .customer-title{
        width: 90%;
        margin: 20px auto 0 auto;
        text-align: center;
        line-height: 40px;
        font-size: 25px;
        font-weight: 500;
        letter-spacing: 0.1em;
    }
    .customer-sub-title{
        width: 90%;
        margin: 10px auto 10px auto;
        text-align: center;
        line-height: 30px;
        font-size: 18px;
        color: #909090;
    }
    .contact-list{
        width: 80%;
        margin: 0 auto;
        min-height: 100px;
        display: block;
        padding-top: 10px;
        padding-bottom: 60px;
    }
    .contact-item{
        width: 100%;
        display: flex;
        margin-top: 20px;
    }
}