@charset "utf-8";
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    color: #333;
}

/* 页头 */
header {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 20px;
}

header h1 {
    font-size: 2em;
}

/* 导航菜单 */
nav ul {
    list-style: none;
    padding: 10px 0;
}

nav ul li {
    display: inline;
    margin: 0 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 1.2em;
}

/* 各个section */
section {
    padding: 20px;
    margin: 20px;
}

/* 标题样式 */
h2 {
    font-size: 1.8em;
    margin-bottom: 10px;
}

h3 {
    font-size: 1.4em;
    margin: 10px 0;
}

/* 页脚 */
footer {
    text-align: center;
    padding: 10px;
    background-color: #333;
    color: white;
}