body{
    margin:0;
    font-family:"Microsoft YaHei";
    background:#0f172a;
    color:white;
}

/* 顶部导航 */
header{
    display:flex;
    justify-content:space-between;
    padding:20px 60px;
    background:#111827;
    position:sticky;
    top:0;
}

.logo{
    font-size:22px;
    font-weight:bold;
    color:#38bdf8;
}

nav a{
    color:white;
    margin-left:20px;
    text-decoration:none;
}

nav a:hover,
nav .active{
    color:#38bdf8;
}

/* banner */
.banner{
    text-align:center;
    padding:80px 20px;
    background:linear-gradient(120deg,#1e3a8a,#0f172a);
}

.banner h1{
    font-size:40px;
}

.banner p{
    color:#cbd5e1;
}

/* 内容区 */
.container{
    display:flex;
    flex-wrap:wrap;
    justify-content:center;
    gap:20px;
    padding:40px;
}

/* 卡片 */
.card{
    width:320px;
    background:rgba(255,255,255,0.05);
    border:1px solid rgba(255,255,255,0.1);
    border-radius:15px;
    padding:20px;
    backdrop-filter: blur(10px);
    transition:0.3s;
}

.card:hover{
    transform:translateY(-10px);
    box-shadow:0 10px 30px rgba(56,189,248,0.2);
}

.card h2{
    color:#38bdf8;
    font-size:18px;
}

.card p{
    color:#cbd5e1;
    font-size:14px;
    line-height:1.6;
}

.card a{
    display:inline-block;
    margin-top:10px;
    color:#38bdf8;
    text-decoration:none;
}

.card a:hover{
    text-decoration:underline;
}