/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
}

header {
    background-color: #333;
    color: #fff;
    padding: 1rem 0;
}

nav {
    display: flex;
    justify-content: space-around;
    align-items: center;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 1.5rem;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
}

.hero {
    text-align: center;
    padding: 5rem 0;
}

.download-btn {
    display: inline-block;
    background-color: #007BFF;
    color: #fff;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 1rem;
}

.download-btn:hover {
    background-color: #0056b3;
}

footer {
    text-align: center;
    padding: 1rem 0;
    background-color: #333;
    color: #fff;
}


section {
    margin-bottom: 3rem;
    padding: 2rem;
}

h2 {
    margin-bottom: 1rem;
}