*{margin:0;padding:0;box-sizing:border-box;font-family:Arial, Helvetica, sans-serif;}
body{color:#333;line-height:1.6;background:#fff;}
.container{max-width:1200px;margin:0 auto;padding:0 20px;}

/* 导航栏 */
header{background:#1a2436;color:#fff;}
.nav-wrap{display:flex;justify-content:space-between;align-items:center;padding:1rem 0;}
.logo{font-size:22px;font-weight:bold;}
nav ul{display:flex;gap:2rem;list-style:none;}
nav a{color:#fff;text-decoration:none;}
nav a:hover{color:#f5a623;}

/* Banner */
.banner{background:#2c3e50;color:white;padding:80px 0;text-align:center;}
.banner h1{font-size:42px;margin-bottom:16px;}
.banner p{font-size:18px;max-width:700px;margin:0 auto 24px;}
.btn{display:inline-block;background:#f5a623;color:#fff;padding:12px 28px;border-radius:4px;text-decoration:none;}
.btn:hover{background:#e09612;}

section{padding:60px 0;}
.section-title{text-align:center;font-size:30px;margin-bottom:40px;color:#1a2436;}

/* 产品卡片 */
.product-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px;}
.card{border:1px solid #eee;border-radius:6px;overflow:hidden;}
.card-body{padding:16px;}
.card h3{margin-bottom:8px;}

/* 表单 */
.form-wrap{max-width:600px;margin:0 auto;}
.form-item{margin-bottom:16px;}
label{display:block;margin-bottom:6px;}
input,textarea{width:100%;padding:10px;border:1px solid #ccc;border-radius:4px;font-size:16px;}
textarea{min-height:140px;}

footer{background:#1a2436;color:#fff;padding:30px 0;text-align:center;margin-top:20px;}

/* 响应式 */
@media(max-width:768px){
.nav-wrap{flex-direction:column;gap:12px;}
nav ul{gap:1rem;flex-wrap:wrap;justify-content:center;}
.banner h1{font-size:28px;}
}