/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Microsoft YaHei", sans-serif;
    background-color: #f5f5f5;
    color: #333;
}

/* 导航栏样式 */
.main-nav {
    background-color: #2c3e50;
    padding: 1rem 0;
}

.main-nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
}

.main-nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    transition: color 0.3s;
}

.main-nav a:hover {
    color: #3498db;
}

/* 页脚样式 */
footer {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
}