*{
    margin: 0;
    padding: 0;
}

body{
    background-color: #f5f5f5;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('https://img.btblog.cn/my2025/12/31/1b3d07c4-3459-0687-71be-08307241fa80.png');
    background-size: cover;
    background-position: center;
    filter: brightness(1);
    z-index: -1;
}

/*顶部标题栏 */
.title-bar{
    width: 100%;
    min-height: 80px; 
    line-height: 80px;
    background-color: #ffffff33;
    backdrop-filter: blur(10px);
    position:relative;
    font-weight: bold;
    border-bottom: 3px solid #66ccff;
    box-sizing: border-box;
    overflow: visible; 
    z-index: 1;
}

.title-bar .icon-container{
    width:20%;
    position:absolute;
    text-align: center;
}

.icon-container .icon{
    display: inline-block;
    width: 30px;
    height:30px;
}

.icon-container .icon-title{
    display: inline-block;
    font-size: 36px;
    color: #66ccff;
    font-weight: bolder;
}

.title-bar .button-container{
    position:absolute;
    width: 60%;
    left:50%;
    margin-left: -30%;
    text-align: center;
}

.button-container .dropdown{
    position: relative;
    display: inline-block;
}

/* 隐藏 checkbox */
.button-container .dropdown input[type="checkbox"] {
    display: none;
}

/* 点击后显示菜单 */
.button-container .dropdown input[type="checkbox"]:checked ~ .dropdown-menu {
    display: block;
}

.button-container .button{
    display: block;
    margin: 0 20px;
    color: #66ccff;
    height: 40px;
    line-height: 40px;
    padding: 2px 20px;
    text-decoration: none; 
}

.button-container .button:hover{
    color: #fff;
    background-color: #66ccff;
    border-radius: 22px;
}


.button-container .dropdown-menu{
    width: 100%;
    display: none;
    position: absolute;
    background-color: #ffffff33;
    backdrop-filter: blur(10px);
    border-radius: 22px;
    left: 50%;
    transform: translateX(-50%);
}

.button-container .dropdown-menu a{
    line-height: 50px;
    display:block;
    color: #66ccff;
    text-decoration: none; 
}


.title-bar .login-container{
    position:absolute;
    width: 20%;
    right: 0;
    text-align: center;
}

.login-container .button{
    display: inline-block;
    height: 40px;
    line-height: 40px;
    padding: 0 20px;
    margin: 0 5px;
    color: #66ccff;
    text-decoration: none; 
    border-radius: 22px;
    border: 2px solid #66ccff;
}

.login-container .button:hover{
    color: #fff;
    background-color: #66ccff;
}


/* 中间内容区域 */
.content-container{
    position: relative;
    width: 100%;
    height: 500px;
    text-align: center;
}

.content-container .content{
    position: absolute;
    width: 100%;
    top: 50%;
    transform: translateY(-50%);
}

.content-container .content .text1{
    font-weight: bolder;
    font-size: 60px;
    color: #66ccff;
    text-shadow: 2px 2px 8px #66ccff;
}

.content-container .content .text2{
    font-weight: bolder;
    font-size: 30px;
    color: #f5f5f5;
    text-shadow: 2px 2px 8px #999;
    margin: 20px;
}

.content-container .content .button{
    border: none;
    background-color: #66ccff;
    color: #fff;
    font-size: 20px;
    padding: 10px 40px;
    border-radius: 50px;
}

.content-container .content .button:hover{
    background-color: #3399ff;
}

/* 卡片区域 */

.card-container{
    position: relative;
    width: 100%;
}

.card-container .content{
    position: relative;
    width:100%;
    text-align: center;
}

.card-container .content .text1{
    font-weight: bold;
    font-size: 40px;
    color: #66ccff;
    text-shadow: 2px 2px 5px #66ccff;
}

.card-container .content .text2{
    font-weight: bold;
    font-size: 20px;
    color: #f5f5f5;
    text-shadow: 2px 2px 5px #999;
    margin: 20px;
}

.card-container .cards{
    position: relative;
    width: 90%;
    margin-left: 5%;
    margin-right: 5%;
    margin-bottom: 100px;
    /* background-color: #ff9696ff; */
}

/* 卡片样式1 */
.card-container .card{
    position: relative;
    display: inline-block;
    width: 22%;
    height: 100%;
    margin: 1%;
    border-radius: 30px;
    background-color: #ffffff33;
    backdrop-filter: blur(10px);
    overflow: hidden;
    text-align: center;
}

.card-container .card::before{
    content: "";
    display: block;
    width: 100%;
    height: 6px;
    background-color: #66ccff;
}

.card-container .card:hover{
    box-shadow: 0px 0px 20px 2px #66ccff;
}

.card-container .card .icon{
    /* display: block; */
    width: 128px;
    height: 128px;
    margin: 20px auto;
}

.card-container .card .text1{
    font-weight: bold;
    font-size: 26px;
    color: #66ccff;
}

.card-container .card .text2{
    color: #fff;
    margin: 20px;
    margin-bottom: 40px;
}

/* 卡片样式2 */
.card-container .card2{
    position: relative;
    display: inline-block;
    width: 30%;
    height: 100%;
    margin: 1%;
    border-radius: 30px;
    background-color: #ffffff33;
    backdrop-filter: blur(10px);
    overflow: hidden;
}

.card-container .card2 .card2-top{
    /* width: 100%; */
    background-color: #66ccff;
    padding: 20px;
    text-align: center;
}

.card-container .card2 .card2-top .text1{
    font-weight: bold;
    font-size: 26px;
    color: #fff;
}

.card-container .card2 .card2-top .text2{
    font-weight: bold;
    font-size: 32px;
    color: #fff;
}

.card-container .card2 .card2-ul{
    margin: 20px;
    list-style: none;
    font-weight: bold;
    color: #fff;
}

.card2 .card2-ul li{
    margin: 20px 0;
}

.card2 .card2-ul .text2{
   float: right;
   color: #66ccff;
}

.card-container .card2:hover{
    box-shadow: 0px 0px 20px 2px #66ccff;
}

.card-container .card2 .button{
    display: block;
    margin: 30px auto;
    border: none;
    background-color: #66ccff;
    color: #fff;
    padding: 10px 40px;
    border-radius: 50px;
}

.card-container .card2 .button:hover{
    background-color: #3399ff;
}

.bottom-bar{
    position: relative;
    width: 100%;
    height: 100px;
    background-color: #66ccff;
    text-align: center;
    color: #fff;
}

.bottom-bar .text{
    width: 100%;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
}

/* 右下角立绘 */
.fixed{
    position: fixed;
    bottom: 0;
    right: 0;
    /* border-radius: 50%; */
    /* overflow: hidden; */
}

.fixed img{
    width: 300px;
    height: 400px;
    opacity: 0.8;
}



/* 平板设备 (768px - 991px) */
@media only screen and (max-width: 991px) and (min-width: 768px) {
    .title-bar{
        height: 150px;
        line-height: 150px;
    }
    
    .title-bar .icon-container{
        width: 100%;
        position: relative;
        height: 40px;
        line-height: 40px;
    }
    
    .title-bar .button-container{
        width: 100%;
        position: relative;
        left: 0;
        margin-left: 0;
        margin-top: 10px;
        height: 40px;
        line-height: 40px;
    }
    
    .title-bar .login-container{
        width: 100%;
        position: relative;
        right: 0;
        margin-top: 10px;
        height: 30px;
        line-height: 30px;
    }
    
    .content-container{
        height: 400px;
    }
    
    .content-container .content .text1{
        font-size: 48px;
    }
    
    .content-container .content .text2{
        font-size: 24px;
    }
    
    .card-container .card{
        width: 45%;
        margin: 2%;
    }
    
    .card-container .card2{
        width: 45%;
        margin: 2%;
    }
}

/* 手机设备 (320px - 767px) */
@media only screen and (max-width: 767px) {
    /* 顶部标题栏优化 */
    .title-bar{
        height: auto;
        min-height: 200px;
        line-height: 40px;
        padding: 10px 0;
    }
    
    .title-bar .icon-container{
        width: 100%;
        position: relative;
        height: 50px;
        line-height: 50px;
    }
    
    .icon-container .icon{
        width: 24px;
        height: 24px;
    }
    
    .icon-container .icon-title{
        font-size: 28px;
    }
    
    .title-bar .button-container{
        width: 100%;
        position: relative;
        left: 0;
        margin-left: 0;
        margin-top: 10px;
        height: auto;
        text-align: center;
    }
    
    .button-container .dropdown{
        display: block;
        width: 100%;
        margin: 5px 0;
    }
    
    .button-container .button{
        display: block;
        width: 80%;
        margin: 5px auto;
        padding: 8px 15px;
        font-size: 14px;
        text-align: center;
        border: 1px solid #66ccff;
        background-color: #ffffff33;
        border-radius: 20px;
    }
    
    .button-container .button:hover{
        color: #fff;
        background-color: #66ccff;
        border-radius: 20px;
    }
    
    .button-container .dropdown-menu{
        position: static;
        width: 80%;
        margin: 5px auto;
        transform: none;
        left: auto;
        background-color: #ffffff33;
        backdrop-filter: blur(10px);
        border: 1px solid #66ccff;
        border-radius: 20px;
    }
    
    .button-container .dropdown-menu a{
        line-height: 40px;
        text-align: center;
        border-bottom: 1px solid rgba(102, 204, 255, 0.3);
    }
    
    .button-container .dropdown-menu a:last-child{
        border-bottom: none;
    }
    
    .title-bar .login-container{
        width: 100%;
        position: relative;
        right: 0;
        margin-top: 15px;
        height: 40px;
        line-height: 40px;
        text-align: center;
    }
    
    .login-container .button{
        display: inline-block;
        padding: 0 15px;
        font-size: 14px;
        margin: 0 5px;
    }
    
    /* 中间内容区域优化 */
    .content-container{
        height: 300px;
    }
    
    .content-container .content .text1{
        font-size: 32px;
    }
    
    .content-container .content .text2{
        font-size: 18px;
        margin: 10px;
    }
    
    .content-container .content .button{
        font-size: 16px;
        padding: 8px 30px;
    }
    
    /* 卡片区域优化 */
    .card-container .content .text1{
        font-size: 28px;
    }
    
    .card-container .content .text2{
        font-size: 16px;
    }
    
    .card-container .cards{
        width: 95%;
        margin-left: 2.5%;
        margin-right: 2.5%;
    }