body {
    width: auto;
    height: auto;
    margin: 0;
    padding: 0;
    font-family: "Microsoft YaHei", Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-color: #f5f5f5;
    font-size: 14px;
    min-width: 1240px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    outline: none;
    text-decoration: none;
}

.font1 {
    font-size: 28px;
}

.font2 {
    font-size: 24px;
}

.font3 {
    font-size: 20px;
}

.font4 {
    font-size: 16px;
}

.font5 {
    font-size: 12px;
}

.fontColor {
    color: #000;
}

.fontColor1 {
    color: #7C7C7C;
}

.fontColor2 {
    color: #999;
}

.fontColor3 {
    color: #D9D9D9;
}

.header {
    background-color: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(0px);
    position: sticky;
    top: 0px;
    transition: all .3s linear;
    height: 60px;
    width: 100%;
    min-width: 1240px;
    z-index: 100;
}

.headerBox {
    height: 100%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header .box {
    background: radial-gradient(#d8d8d8 20%,transparent 60%);
    height: 1px;
    margin: 0 auto;
    width: 100%;
}

.mainBody {
    flex: 1;
    margin-top: -60px;
}

.footer {
    background-color: #fff;
}

.footerBox {
    height: 100px;
    width: 1200px;  
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.headerTitle {
    cursor: pointer;
    color: #fff;
    font-family: '宋体';
}

.headerLogoBox {
    display: flex;
    align-items: center;
    gap: 10px;
}

.headerLogoBox > img {
    height: 30px;
    object-fit: contain;
}

.nav {
    display: flex;
    gap: 35px;
}

.nav a {
    color: #fff;
}

.nav a:hover {
    opacity: .72;
}

.banner {
    height: 100vh;
    transition: all .5s linear;
    position: relative;
}

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

.bannerTitle {
    position: absolute;
    top: 0;
    height: 100%;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

.mustFill:after {
    color: #f00;
    content: "*";
    /* position: absolute; */
    margin-left: 5px;
  }