html{
    scroll-behavior: smooth;
    overflow: scroll;
    -webkit-overflow-scrolling: touch;
}
body{
    margin: 0;
    padding: 0;
}
*{
    font-family: 'Times New Roman', "Helvetica Neue", Helvetica, "PingFang SC", "Microsoft YaHei", Tahoma, sans-serif, auto !important;
}
.container{
    width: 100%;
}
.header{
    width: 100%;
    /* height: 15%; */
    background-color: #393D49;
    background-image: url(images/style/head.jpg);
    background-size:100% 100%;
    -moz-background-size:100% 100%;
    color: white;
    display: flex;
}
@media screen and (max-width: 1080px){
    .text_line_height{
        line-height: 1.5;
    }
}
@media screen and (max-width: 480px) {
    .font_scale{
        /* white-space: nowrap; */
        transform: scale(0.7);
    }
    .text_scale{
        transform: scale(0.6);
    }
    .nav span{
        white-space: nowrap;
        transform: scale(0.6);
    }
    .text_line_height{
        line-height: 1.2;
    }
  }
.logo{
    width: 36%
}
/* .labName_warpper::before{
    content: "A logo goes here";
    font-size: 1vw;
    position: absolute;
    left: 5%;
    top: 70%;
} */
.labName_warpper{
    position: relative;
    width: 30%;
    /* padding: 0 2%; */
    display: flex;
    align-items: center;
    justify-content: center;
}
.labName_warpper::after{
    content: "";
    width: 0.2vw;
    margin-left: 5%;
    height: 70%;
    background-color: #fff;
}
.labName{
    margin: 0 8%;
    /* width: 11vw; */
    text-align: center;
}
.nav{
    width: 54%;
    height: 100%;
    display: flex;
}
.nav_warpper{
    width: 100%;
}
/* .nav_cell{
    width: 20%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color .3s linear;
} */
.nav li{
    width: 20%;
    height: 100%;
    display: flex !important;
    justify-content: center;
    align-items: center;
    transition: background-color .3s linear;
}
/* a{
    text-decoration: none;
    color: white;
} */
.nav a{
    padding: 30% 10%;
    text-decoration: none;
    color: white;
}
.nav span{
    padding: 0 !important;
    font-size: 1.6vw;
    white-space: nowrap;
    font-family: 'Times New Roman', "Helvetica Neue", Helvetica, "PingFang SC", "Microsoft YaHei", Tahoma, sans-serif, auto;
}
/* .nav_link{
    padding: 20% 10% 20% 10%;
    text-decoration: none;
    color: white;
} */
/* .nav_cell:hover{
    background-color: #1E9FFF;
    opacity: 0.7;
} */
.nav li:hover{
    background-color: #1E9FFF;
    opacity: 0.7;
}
.footer{
    /* background-color: #393D49; */
    background-image: url(images/style/rear.jpg);
    background-size:100% 100%;
    -moz-background-size:100% 100%;
    color: white;
    font-size: 1rem;
    /* height: 30%; */
    width: 100%;
    /* margin: 2% 0 0 0; */
    display: flex;
    justify-content: center;
    align-items: center;
}
.footer ul li{
    text-align: center;
    line-height: 2;
}
.footer_name{
    /* font-weight: bold; */
    font-size: 1.4vw;
}
.footer_content{
    /* font-weight: lighter; */
    font-size: 1.4vw;
}
.title_warpper{
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}
.title_warpper_left{
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}
/* .title_warpper span{
    width: 20%;
    text-align: center;
} */
ul li{
    list-style: none;
}
ul{
    margin: 0;
    padding: 0;
}
.word_space{
    letter-spacing: 3px;
}
.bar_warpper{
    width: 100%;
    height: 0.5%;
    margin: 3% 0 3% 0;
    display: flex;
    justify-content: center;
}
.bar{
    width: 6%;
    height: 100%;
    background-image: linear-gradient(to right, rgb(34, 174, 253), rgb(90, 84, 182));
}
.big_font_title{
    font-size: 3vw;
    /* font-weight: bold; */
}
.mid_font_title{
    font-size: 2vw;
    font-weight: bold;
    text-align: left;
}
.left_font_title{
    font-size: 2vw;
    font-weight: bold;
    text-align: left;
}
.small_font_title{
    font-size: 1.6vw;
    font-weight: bold;
}
.large_font_text{
    font-size: 1.4vw;
}
.small_font_text{
    font-size: 1vw;
    /* line-height: 1.4; */
}
.tiny_font_text{
    font-size: 0.8vw;
}

.module_span{
    padding: 2% 0;
}
.text_line_height{
    line-height: 2;
}
.arrow_warpper{
    width: 2vw;
    height: 2vw;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 2%;
    cursor: pointer;
    transition: .5s;
}
.arrow_warpper_fold{
    transform: rotate(-90deg);
    transition: .5s;
}
.arrow{
    position: relative;
    width: 10%;
    height: 80%;
    background-color: black;
}
.left_arrow{
    left: -22%;
    transform: rotate(-45deg);
}
.right_arrow{
    left: 22%;
    transform: rotate(45deg);
}