/* 通用样式 */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}
.container {
    width: 80%;
    margin: 0 auto;
    padding: 20px 0;
}
/* 头部导航栏 */
header {
    background: #333;
    color: #fff;
    padding: 10px 0;
    text-align: center;
}
header h1 {
    margin: 0;
}
header a {
    color: #fff;
    text-decoration: none;
    margin: 0 15px;
}
/* 商品列表 */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}
.product-item {
    background: #fff;
    border: 1px solid #ddd;
    padding: 15px;
    text-align: center;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.product-item img {
    max-width: 100%;
    height: auto;
    border-radius: 5px;
}
.product-item h3 {
    margin: 10px 0;
}
.product-item .price {
    color: #e67e22;
    font-size: 1.2em;
    font-weight: bold;
}
.btn {
    display: inline-block;
    padding: 10px 20px;
    background: #e67e22;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 10px;
}
/* 购物车和结账页面 */
.cart-item {
    background: #fff;
    border: 1px solid #ddd;
    padding: 15px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.total {
    text-align: right;
    font-size: 1.5em;
    margin-top: 20px;
}
/* 底部 */
footer {
    text-align: center;
    padding: 10px 0;
    background: #333;
    color: #fff;
    margin-top: 20px;
}