/* 全局样式 */
body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f9f9f9;
}

/* 页眉样式 */
header {
    text-align: center;
    padding: 40px 0;
    background-color: #2c3e50;
    color: white;
    border-radius: 5px;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

/* 主要内容区域 */
main {
    padding: 20px;
    background-color: white;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

section {
    margin-bottom: 40px;
}

h2 {
    color: #2c3e50;
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
    margin-bottom: 20px;
}

h3 {
    color: #3498db;
}

/* 功能列表样式 */
.features ul {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.features li {
    background-color: #f0f8ff;
    padding: 20px;
    border-radius: 5px;
    border-left: 4px solid #3498db;
}

/* 下载按钮样式 */
.download-btn {
    display: inline-block;
    background-color: #3498db;
    color: white;
    padding: 12px 25px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: background-color 0.3s;
}

.download-btn:hover {
    background-color: #2980b9;
}

/* 页脚样式 */
footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    color: #7f8c8d;
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    header {
        padding: 20px 0;
    }
    
    .features ul {
        grid-template-columns: 1fr;
    }
}