body {
            font-family: Arial, sans-serif;
            line-height: 1.6;
            margin: 0;
            padding: 0 20px;
        }
        h1, h2, h3 {
            color: #333;
        }
        h1 {
            font-size: 2em;
        }
        h2 {
            font-size: 1.5em;
        }
        h3 {
            font-size: 1.2em;
        }
        p {
            margin: 1em 0;
        }
        .toc {
            margin: 20px 0;
            padding: 10px;
            background: #f4f4f4;
            border: 1px solid #ddd;
        }
        .toc a {
            text-decoration: none;
            color: #333;
        }
        .toc a:hover {
            text-decoration: underline;
        }