@charset "utf-8";
@media screen and (min-width: 1000px) {
    .header{
        display: block;
    }
    .container{
        display: block;
    }
    .footer{
        display: block;
    }
    .suojin{
        display: none;
    }
    #navigation {
        display: block;
    }
    #navigation a{
        text-decoration: none;
    }
    #navigationIphone {
        display: none;
    }
    .main-content ul li{
        display: inline-block;
        background-color: #FFFFFF;
        text-align: left;
        width: 24%; /* 每块占总宽度的25% */
        box-sizing: border-box; /* 确保边框不会影响实际宽度 */
        padding: 20px; /* 内边距 */
    }
    .main-content ul li img{
        height: 72px;
        width: 72px;
    }
    .main-content ul li a{
        text-decoration: none;
    }
    .main-content ul li span{
        display: inline-block;
        background-color: #FFFFFF;
        width: 93px;
        overflow: hidden;
        height: 75px;
        text-overflow: ellipsis;
        background-size: auto;
        line-height: 19px;
        font-size: 12px;
    }
    .header h2{
        float:left;
        margin-top:20px;
        padding: 0px 30px 0px 0px;
    }
    .main{
        padding: 70px 0px 0px 220px;
    }
    .top-btn {
        position: fixed;
        bottom: 20px;
        right: 20px;
        width: 50px;
        height: 50px;
        background-color: #ccc;
        border-radius: 50%;
        cursor: pointer;
        text-align: center;
        line-height: 40px;
    }
}

@media screen and (max-width: 1000px) {
    .header{
        display: block;
    }
    .sidebar{
        display: none;
    }
    .main-content{
        display: block;
    }
    .footer{
        display: block;
    }
    .suojin{
        display: block;
        font-size: 53px;
    }
    #navigation {
        display: none;
    }
    #navigationIphone {
        display: none;
        margin: 45px 0px 0px 700px;
        font-size: 40px;
    }
    .main-content ul li{
        display: inline-block;
        margin-right: 100px;
        background-color: #FFFFFF;
        text-align: left;
        font-size: 40px;
        list-style-type: none;
        padding: 20px; /* 内边距 */
    }
    .main-content ul li span{
        display: inline-block;
        background-color: #FFFFFF;
        width: 202px;
        overflow: hidden;
        height: 227px;
        text-overflow: ellipsis;
        background-size: auto;
        font-size: 35px;
    }
    .main-content ul li img{
        height: 260px;
        width: 260px;
    }
    .main-content ul li a{
        text-decoration: none;
    }
    .header h2{
        float:left;
        margin-top:20px;
        padding: 0px 30px 0px 0px;
        font-size: 53px;
    }
    .main{
        padding: 100px 0px 0px 70px;
    }
    .main-content h2{
        font-size: 60px;
    }
    .top-btn {
        position: fixed;
        bottom: 20px;
        right: 20px;
        width: 90px;
        height: 77px;
        background-color: #ccc;
        border-radius: 50%;
        cursor: pointer;
        text-align: center;
        line-height: 70px;
        font-size: 36px;
    }
}
.container {
    margin: 0 0 200px 0;
    /*max-width: 1200px;*/
    /*padding: 0 20px;*/
}

.header {
    background-color: #FFFFFF;
    text-align: left;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000; /* 确保header在其他内容之上 */
    border-bottom: 1px solid #ddd;
}

.header div ul li{
    display: inline-block;
    height: 50px;
    margin-right: 10px;
    background-color: #FFFFFF;
    text-align: right;
    line-height: 50px;
}

.footer {
    background-color: #FFFFFF;
    text-align: center;
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
}

.content {
    display: flex;
    /*justify-content: space-between;*/
}

.sidebar {
    background-color: #FFFFFF;
    padding: 80px 0px 0px 0px;
    overflow-y: auto;
    width: 200px;
    height: calc(100vh - 150px);
    position: fixed;
}
.sidebar a{
    text-decoration: none;
}

.main-content {
    background-color: #FFFFFF;
    /*width: 1000px;*/
    float: left;
}
.suojin{
    float: right;
}

.top-btn:hover {
    background-color: #aaa;
}

/** 鼠标滑动颜色 **/
.sidebar ul li:hover {
    background-color: #dbdbdb; /* 鼠标滑过的颜色 */
    cursor: pointer;
}
/** 鼠标滑动颜色 **/