*{margin:0;padding:0;box-sizing:border-box;font-family:"Microsoft Yahei",sans-serif;}
.container{width:1200px;margin:0 auto;padding:0 15px;max-width:100%;}
a{text-decoration:none;color:#333;}
ul{list-style:none;}

header{background:#fff;box-shadow:0 2px 6px #eee;position:sticky;top:0;z-index:99;}
.nav-wrap{display:flex;justify-content:space-between;align-items:center;height:70px;}
.logo{font-size:22px;font-weight:bold;color:#164b96;}
.nav ul{display:flex;gap:24px;}
.nav a{font-size:16px;padding:8px 0;color:#333;}
.nav a:hover{color:#164b96;border-bottom:2px solid #164b96;}

.banner{background:#164b96;color:#fff;padding:80px 0;}
.banner h1{font-size:36px;margin-bottom:16px;}
.banner p{font-size:18px;margin-bottom:24px;max-width:700px;}
.btn{display:inline-block;background:#fff;color:#164b96;padding:12px 24px;border-radius:4px;font-weight:bold;}
.btn:hover{background:#0f3872;color:#fff;transition:0.3s;}

section{padding:60px 0;}
.title{text-align:center;font-size:28px;color:#222;margin-bottom:40px;}
.product-list{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.card{background:#fff;box-shadow:0 2px 10px #eee;border-radius:6px;overflow:hidden;text-align:center;}
.card-body{padding:16px;}
.card h3{margin-bottom:8px;color:#164b96;}
.advantage-wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.advantage-item{text-align:center;padding:20px;background:#fff;box-shadow:0 2px 10px #eee;border-radius:6px;}

footer{background:#222;color:#fff;text-align:center;padding:30px 0;font-size:14px;}

/*响应式适配手机*/
@media(max-width:992px){
    .product-list{grid-template-columns:repeat(2,1fr);}
    .advantage-wrap{grid-template-columns:repeat(2,1fr);}
    .nav-wrap{flex-direction:column;height:auto;padding:15px 0;}
    .nav ul{flex-wrap:wrap;justify-content:center;margin-top:10px;}
}
@media(max-width:576px){
    .product-list,.advantage-wrap{grid-template-columns:1fr;}
    .banner h1{font-size:26px;}
}