*{margin:0;padding:0;box-sizing:border-box;font-family:Arial,Helvetica,sans-serif}
body{background:#f8fafc;color:#1e293b;line-height:1.7}
.container{width:90%;max-width:1200px;margin:auto}
header{background:#0f172a;color:#fff}
nav{display:flex;justify-content:space-between;align-items:center;padding:18px 0}
.logo{font-size:22px;font-weight:bold;color:#f97316}
nav ul{display:flex;list-style:none}
nav ul li{margin-left:25px}
nav ul li a{color:#fff;text-decoration:none}
.banner{background:url("https://tse-mm.bing.com/th?q=运动装备") center/cover;height:420px;display:flex;align-items:center;color:white}
.banner h1{font-size:42px}
.section{padding:60px 0}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:30px}
.card{background:#fff;padding:25px;border-radius:8px;box-shadow:0 5px 15px rgba(0,0,0,0.05)}
.card img{width:100%;border-radius:6px;margin-bottom:15px}
footer{background:#0f172a;color:#ccc;text-align:center;padding:30px;margin-top:40px}
@media(max-width:768px){
.banner{height:300px;text-align:center}
.banner h1{font-size:30px}
nav ul{display:none}
}