/* 全局样式 */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

nav {
    background-color: #333;
    color: white;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
}

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    padding: 15px 0;
    display: block;
}

.hero {
    background-color: #007BFF;
    color: white;
    text-align: center;
    padding: 100px 0;
}

.content {
    padding: 50px;
    text-align: center;
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 15px 0;
}

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

    nav ul li {
        margin: 5px 0;
    }
}