*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body {
    font-family: Arial, sans-serif;
}
.hide{
    display: none;
}
.mask{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 98;
}
.alert-box{
    position: absolute;
    width: 7rem;
    top: 3rem;
    right: 3rem;
    background-color: #fff;
    z-index: 99;
    border-radius: 4px;
    overflow: hidden;
}
.alert-item{
    height: 2.5rem;
    line-height: 2.5rem;
    text-align: center;
    cursor: pointer;
    border-bottom: 1px solid #ddd;
}
.alert-item-active{
    color: #1b7cff;
}
.banner-box{
    width: 100%;
    height: 100vh;
    position: relative;
    background: url(../img/banner1.jpg) no-repeat center center;
    background-size: cover;
}
.banner{
    width: 100%;
    background: url(../img/banner-color.png) no-repeat center center;
    background-size: cover;
    position: absolute;
    height: 100%;
}

.banner-buttons{
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    z-index: 9;
    bottom: 5rem;
}
.button-item{
    width: 18rem;
    height: 5rem;
    position: relative;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    cursor: pointer;
    margin: 0 1rem;
}


.but-img{
    width: 100%;
    position: absolute;
    top: 2px;
    left: 0;
    z-index: -1;
}
.but-icon{
    width: 2rem;
    height: 2rem;
}

.but-text{
    margin-left: 0.5rem;
}

.header-box{
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    z-index: 99;
    padding: 1rem;
    box-sizing: border-box;
    color: #fff;
}
.logo{
    width: 7rem;
}

.tool-box{
    display: flex;
    align-items: center;
    
}

.tool-item{
    display: flex;
    align-items: center;
    margin-left: 0.5rem;
    font-size: 14px;
    cursor: pointer;
}

.kf-icon{
    width: 1.2rem;
}
.bom-icon{
    width: 1rem;
}

.bottom-icon{
    display: none;
}

.banner-nav{
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    left: 50%; /* 水平居中 */
    transform: translateX(-50%); /* 修正偏移 */
    bottom: 17rem;
}

.nav-item{
    text-align: right;
    color: #fff;
}
.nav-icon{
    width: 24vw;
}

.slogan-icon{
    width: 28vw;
    margin-left: 10rem;
}

.content-box{
    padding: 2rem;
}
.content-item{
    width: 90%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 2rem;
    box-sizing: border-box;
    margin-bottom: 2rem;
}
.content-item:nth-child(2n){
    flex-direction: row-reverse;
}
.content-msg{
    text-align: center;
    width: 45%;
}
.content-icon{
    width: 50%;
}
h3{
    font-size: 1.8rem;
    color: #1c5fb8;
    margin-bottom: 1rem;
}
.con-txt{
    width: 65%;
    margin: 0 auto;
    font-size: 1.2rem;
    color: #999;
}

.content-nav{
    text-align: center;
}
h2{
    font-size: 1.6rem;
    color: #1c5fb8;
}
.content-nav-image{
    margin-top: 3rem;
}
.cn-img{
    width: 12rem;
}
/* 
.cn-img:last-child{
    margin-left: 5rem;
} */
.footer-box{
    background-color: #1b7cff;
    text-align: center;
    color: #fff;
    margin-top: 5rem;
    padding: 2rem 0 0;
}
.bom-logo{
    width: 15rem;
    margin: 5rem 0;
}
.line{
    width: 96%;
    margin: 0 auto;
    height: 1px;
    background-color: #fff;
    margin: 1rem auto;
}
.bom-buttons{
    display: flex;
    justify-content: center;
    position: relative;
    z-index: 9;
    margin: 2rem 0;
}
.version-item{
    font-size: 1.2rem;
}

.copyright-item{
    font-size: 1rem;
    margin-top: 1rem;
    background-color: #0050b3;
    padding: 1rem;
    box-sizing: border-box;
}
.txt-item{
    font-size: 2vw;
    /* font-size: 2rem; */
}
/* 针对不同设备的媒体查询 */
@media (min-width: 1024px) {
    /* Web端样式 */
    .banner-buttons{
        bottom: 6rem;
    }
    .button-item{
        margin-right: 3rem;
    }

    
}
@media (min-width: 768px) and (max-width: 1023px) {
    /* iPad端样式 */
    .ios-button{
        display: none;
    }
    .android-button{
        margin-left: 0;
    }
    .banner-buttons{
        bottom: 5rem;
    }
    .android-button{
        margin-right: 2rem;
    }
    .nav-icon{
        width: 28vw;
    }

    .slogan-icon{
        width: 30vw;
        margin-left: 5rem;
    }
    .content-msg{
        width: 45%;
    }
}

@media (max-width: 767px) {
    .banner-box{
        max-height: 667px;
    }
    /* iPhone端样式 */
    .ios-button{
        display: none;
    }
    .android-button{
        margin-right: 0.5rem;
    }
    .banner-buttons{
        bottom: 5rem;
    }

    .button-item{
        width: 10rem;
        height: 3rem;
        font-size: 0.8rem;
    }
    .but-icon{
        width: 1.2rem;
        height: 1.2rem;
    }
    .bottom-icon{
        width: 2rem;
        display: block;
        position: absolute;
        bottom: 1.8rem;
        left: 50%; /* 水平居中 */
        transform: translateX(-50%); /* 修正偏移 */
    }

    .banner-nav{
        flex-direction: column;
        bottom: 11rem;
    }
    .nav-icon{
        width: 12rem;
    }

    .slogan-icon{
        width: 12rem;
        margin-left: 0;
        margin-top: 1rem;
    }
    .nav-item{
        font-size: 12px;
        text-align: center;
    }
    .content-item{
        flex-direction: column-reverse !important;
        padding: 0;
        
    }
    .content-icon{
        width: 100%;
        margin-top: 1rem;
    }
    .content-msg{
        width: 100%;
        text-align: center;
    }
    h3{
        font-size: 1.3rem;
        margin-top: 3rem;
    }

    .con-txt{
        width: 100%;
        font-size: 0.9rem;
    }

    .txt-item{
        font-size: 0.8rem;
    }

    h2{
        font-size: 1.2rem;
        color: #1c5fb8;
        margin-top: 3rem;
    }
    .content-nav-image{
        margin-top: 2rem;
    }
    .cn-img{
        width: 8rem;
    }

    /* .cn-img:last-child{
        margin-left: 2rem;
    } */

    .bom-logo,.bom-buttons{
        margin: 3rem 0;
    }

    .version-item{
        font-size: 1rem;
    }

    .copyright-item{
        font-size: 0.9rem;
    }

}