*{margin:0;padding:0;box-sizing:border-box;font-family:"Microsoft Yahei",sans-serif}
body{background:#0a0e17;color:#eee;line-height:1.6}
a{text-decoration:none;color:#fff}
ul{list-style:none}
.container{width:1200px;margin:0 auto;max-width:95%;padding:0 10px}

/* 导航栏 */
.header{background:#101624;border-bottom:1px solid #232b3f;padding:15px 0;position:sticky;top:0;z-index:99}
.nav-wrap{display:flex;justify-content:space-between;align-items:center}
.logo{font-size:24px;font-weight:bold;color:#409eff}
.nav-menu{display:flex;gap:30px}
.nav-menu li a{padding:8px 12px;border-radius:4px;transition:0.3s}
.nav-menu li a:hover,.nav-menu li a.active{background:#409eff}
.vip-btn{background:linear-gradient(45deg,#722ed1,#409eff);padding:8px 18px;border-radius:20px}

/* 轮播横幅 */
.banner{height:320px;background:url(banner.jpg);border-radius:10px;margin:20px 0;display:flex;align-items:center;padding:40px}
.banner-text h2{font-size:36px;margin-bottom:15px;color:#fff}
.banner-text p{color:#b4c0d8;font-size:16px;margin-bottom:25px}
.down-btn{background:#409eff;padding:12px 30px;border-radius:6px;font-size:18px}

/* 卡片通用 */
.card-box{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin:30px 0}
.card{background:#141b2b;border:1px solid #273148;border-radius:8px;padding:18px;transition:0.3s}
.card:hover{transform:translateY(-5px);border-color:#409eff}
.card h3{margin:10px 0;color:#fff}
.card p{color:#99a2b3;font-size:14px}

/* 悬浮客服 */
.float-service{position:fixed;right:30px;bottom:100px}
.float-item{width:50px;height:50px;background:#409eff;border-radius:50%;display:flex;align-items:center;justify-content:center;margin-bottom:12px}

/* 页脚 */
.footer{background:#070b12;padding:40px 0;margin-top:60px;border-top:1px solid #232b3f}
.footer-text{text-align:center;color:#77849c;font-size:14px}

/* 响应式适配手机 */
@media(max-width:768px){
    .nav-menu{display:none}
    .card-box{grid-template-columns:repeat(2,1fr)}
    .banner{height:auto;padding:30px}
}