/* 基本样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    background-color: #f4f4f4;
}

/* 头部样式 */
header {
    background-color: #333;
    color: #fff;
    padding: 10px 0;
    text-align: center;
}

header h1 {
    margin-bottom: 10px;
}

nav {
    display: flex;
    justify-content: center;
}

nav a {
    color: #fff;
    text-decoration: none;
    margin: 0 10px;
    padding: 5px 10px;
    border: 1px solid #fff;
    transition: background-color 0.3s ease;
}

nav a:hover {
    background-color: #fff;
    color: #333;
}

/* 菜单和购物车样式 */
section {
    margin: 20px;
    background-color: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

h2 {
    margin-bottom: 10px;
}

#menu, #cart {
    list-style: none;
}

#menu li {
    margin-bottom: 10px;
    padding: 5px;
    border: 1px solid #ddd;
    border-radius: 3px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#cart li {
    margin-bottom: 5px;
    padding: 5px;
    border-bottom: 1px solid #ddd;
}

/* 结算按钮样式 */
#checkout {
    display: block;
    width: 100%;
    padding: 10px;
    background-color: #333;
    color: #fff;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#checkout:hover {
    background-color: #555;
}

/* 响应式设计 */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
    }
}