/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "微软雅黑", Arial, sans-serif;
}

/* 页面背景与容器 */
body {
    background-color: #f5f7fa;
    padding: 20px;
}
.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

/* 头部样式 */
header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
}
header h1 {
    color: #2c3e50;
    margin-bottom: 10px;
}
header p {
    color: #7f8c8d;
    font-size: 16px;
}

/* 卡片样式 */
.card {
    margin-bottom: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
}
.card h2 {
    color: #3498db;
    margin-bottom: 15px;
}
.card p {
    color: #34495e;
    line-height: 1.6;
    margin-bottom: 20px;
}
.demo-img {
    width: 100%;
    max-width: 400px;
    display: block;
    margin: 0 auto;
    border-radius: 5px;
}

/* 提示区域 */
.tips h3 {
    color: #e67e22;
    margin-bottom: 15px;
}
.tips ul {
    list-style: none;
    padding-left: 20px;
}
.tips li {
    color: #555;
    margin-bottom: 10px;
    position: relative;
}
.tips li::before {
    content: "✓";
    color: #27ae60;
    position: absolute;
    left: -20px;
}

/* 页脚样式 */
footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #eee;
    color: #95a5a6;
    font-size: 14px;
}