/* CSS 样式定义 */
            body {
                font-family: Arial, sans-serif;
                line-height: 1.6;
                margin: 0;
                padding: 0;
                background-color: #f4f4f4;
            }

            .container {
                max-width: 1200px;
                margin: 0 auto;
                padding: 20px;
                background-color: #fff;
            }

            .directory {
                background-color: #f1f1f1;
                padding: 15px;
                border-radius: 5px;
                box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
                margin-bottom: 30px;
            }

            .directory h3 {
                margin: 0;
                font-size: 1.4em;
            }

            .directory ul {
                list-style-type: none;
                padding: 0;
            }

            .directory ul li {
                margin: 10px 0;
            }

            .directory ul li a {
                text-decoration: none;
                color: #007BFF;
                font-size: 1.1em;
            }

            .directory ul li a:hover {
                text-decoration: underline;
            }

            .content-section {
                margin-bottom: 50px;
            }

            .intro p {
                font-size: 1.2em;
                color: #333;
                margin: 20px 0;
            }

            .recommendations {
                background-color: #f9f9f9;
                padding: 15px;
                border-radius: 5px;
                box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
            }

            .recommendations h3 {
                font-size: 1.4em;
                margin-bottom: 15px;
            }

            .recommendations ul {
                list-style-type: none;
                padding: 0;
            }

            .recommendations ul li {
                margin: 10px 0;
            }

            .recommendations ul li a {
                text-decoration: none;
                color: #007BFF;
                font-size: 1.1em;
            }

            .recommendations ul li a:hover {
                text-decoration: underline;
            }

            h1, h2 {
                color: #333;
            }