body {
            font-family: Arial, sans-serif;
            line-height: 1.6;
            color: #333;
            margin: 0;
            padding: 0;
        }
        main {
            padding-top: 80px;
            padding-bottom: 50px;
        }
        .container {
            max-width: 1140px;
            margin: 0 auto;
            padding: 0 15px;
        }
        h1 {
            color: #1a3c6e;
            font-size: 2.5rem;
            margin-bottom: 30px;
            text-align: center;
        }
        h2 {
            color: #1a3c6e;
            font-size: 1.8rem;
            margin-top: 40px;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 1px solid #ddd;
        }
        p {
            margin-bottom: 20px;
        }
        .toc {
            background-color: #f8f9fa;
            padding: 20px;
            border-radius: 5px;
            margin-bottom: 30px;
        }
        .toc ul {
            list-style-type: none;
            padding-left: 0;
        }
        .toc li {
            margin-bottom: 10px;
        }
        .toc a {
            text-decoration: none;
            color: #1a3c6e;
        }
        .toc a:hover {
            text-decoration: underline;
        }
        .date {
            text-align: center;
            font-style: italic;
            margin-bottom: 30px;
        }