* { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            line-height: 1.8;
            color: #333;
            background: #fff;
            padding: 24px 20px 48px;
            max-width: 720px;
            margin: 0 auto;
        }
        .subtitle {
            color: #888;
            font-size: 14px;
            margin-bottom: 24px;
        }
        h1 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 8px;
            color: #1a1a1a;
        }
        h2 {
            font-size: 17px;
            font-weight: 600;
            margin-top: 32px;
            margin-bottom: 12px;
            color: #1a1a1a;
        }
        p {
            margin-bottom: 12px;
            font-size: 15px;
        }
        ul {
            padding-left: 20px;
            margin-bottom: 12px;
        }
        li {
            font-size: 15px;
            margin-bottom: 6px;
        }
        li strong {
            font-weight: 600;
        }
        a {
            color: #4a90d9;
            text-decoration: none;
        }
        a:hover {
            text-decoration: underline;
        }
        hr {
            border: none;
            border-top: 1px solid #e5e5e5;
            margin: 36px 0 16px;
        }
        .footer {
            color: #999;
            font-size: 13px;
            text-align: center;
        }