* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: "Microsoft Yahei", sans-serif;
    line-height: 1.8;
    color: #333;
    background: #fff;
}
header {
    background: #23527c;
    padding: 15px 0;
}
nav {
    max-width: 1100px;
    margin: 0 auto;
    text-align: center;
}
nav a {
    color: #fff;
    text-decoration: none;
    margin: 0 12px;
    font-size: 16px;
}
nav a:hover {
    text-decoration: underline;
}
main {
    max-width: 1100px;
    margin: 40px auto;
    padding: 0 20px;
}
h1 {
    font-size: 24px;
    margin-bottom: 20px;
    color: #23527c;
}
h2 {
    font-size: 20px;
    margin: 25px 0 15px;
}
p {
    margin-bottom: 12px;
    font-size: 15px;
}
footer {
    background: #f5f5f5;
    text-align: center;
    padding: 20px 0;
    margin-top: 50px;
    font-size: 14px;
    color: #666;
}