body{margin:0;font-family:Arial,sans-serif;padding-top:90px}.site-header{position:fixed;top:0;left:0;width:100%;display:flex;justify-content:space-between;align-items:center;padding:20px 40px;background:#fff0;transition:background 0.3s ease;z-index:999}.site-header.sticky{background:#333}.logo img{height:50px}.main-menu ul{list-style:none;margin:0;padding:0;display:flex}.main-menu ul li{margin-left:25px}.main-menu ul li a{color:#fff;text-decoration:none;font-size:16px;font-weight:500;transition:color 0.3s}.main-menu ul li a:hover{color:#f1c40f}.header-btn .login-btn{background:#f1c40f;color:#333;padding:8px 20px;border-radius:4px;font-weight:700;text-decoration:none;transition:0.3s}.header-btn .login-btn:hover{background:#fff;color:#000}.site-footer{text-align:center;padding:20px;background:#333;color:#fff;margin-top:50px}.home-banner{text-align:center;padding:120px 20px;background:#f1f1f1}.home-banner h1{font-size:40px;color:#333}.home-banner p{font-size:18px;color:#555}.shop-btn{display:inline-block;margin-top:20px;padding:10px 30px;background:#f1c40f;color:#333;text-decoration:none;border-radius:5px;font-weight:700}.shop-btn:hover{background:#333;color:#fff}