* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: Arial, Helvetica, sans-serif;
            color: #333;
            line-height: 1.6;
            background-color: #f5f5f5;
        }

        #wrapper_container {
            max-width: 1200px;
            margin: 0 auto;
            background-color: #fff;
        }

        header {
            background-color: #fff;
            border-bottom: 3px solid #e5e5e5;
            padding: 20px 0;
        }

        .header_content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        nav {
            background-color: #2c2c2c;
            border-bottom: 2px solid #1a1a1a;
        }

        .nav_menu {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0;
            list-style: none;
            display: flex;
            flex-wrap: wrap;
        }

        .nav_menu li {
            position: relative;
        }

        .nav_menu a {
            display: block;
            padding: 15px 20px;
            color: #fff;
            text-decoration: none;
            transition: background-color 0.3s;
        }

        .nav_menu a:hover {
            background-color: #3d3d3d;
        }

        .breadcrumb {
            max-width: 1200px;
            margin: 0 auto;
            padding: 15px 20px;
            background-color: #f9f9f9;
            font-size: 14px;
            border-bottom: 1px solid #e5e5e5;
        }

        .breadcrumb a {
            color: #666;
            text-decoration: none;
        }

        .breadcrumb a:hover {
            text-decoration: underline;
        }

        main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 30px 20px;
        }

        h1 {
            font-size: 32px;
            color: #2c2c2c;
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 2px solid #e5e5e5;
        }

        article {
            margin-bottom: 40px;
        }

        article h2 {
            font-size: 24px;
            color: #2c2c2c;
            margin-top: 25px;
            margin-bottom: 15px;
        }

        article h3 {
            font-size: 20px;
            color: #333;
            margin-top: 20px;
            margin-bottom: 12px;
        }

        article h4 {
            font-size: 18px;
            color: #444;
            margin-top: 18px;
            margin-bottom: 10px;
        }

        article p {
            margin-bottom: 15px;
            color: #555;
            font-size: 15px;
        }

        .transition_section {
            margin-bottom: 30px;
            padding: 20px;
            background-color: #f9f9f9;
            border-left: 4px solid #2c2c2c;
        }

        .transition_section p {
            color: #555;
            font-size: 15px;
            margin-bottom: 10px;
        }

        .links_section {
            background-color: #f9f9f9;
            padding: 30px;
            border: 1px solid #e5e5e5;
            margin-bottom: 40px;
        }

        .links_section h3 {
            font-size: 20px;
            color: #2c2c2c;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid #e5e5e5;
        }

        .links_section ul {
            list-style: none;
            column-count: 2;
            column-gap: 30px;
            margin-bottom: 25px;
        }

        .links_section li {
            margin-bottom: 10px;
            break-inside: avoid;
        }

        .links_section a {
            color: #0066cc;
            text-decoration: none;
            font-size: 15px;
            display: inline-block;
            padding: 5px 0;
            transition: color 0.3s;
        }

        .links_section a:hover {
            color: #004499;
            text-decoration: underline;
        }

        footer {
            background-color: #2c2c2c;
            color: #ccc;
            padding: 40px 0 20px;
            margin-top: 50px;
        }

        .footer_content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .footer_links {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            margin-bottom: 30px;
        }

        .footer_column {
            flex: 1;
            min-width: 200px;
            margin-bottom: 20px;
        }

        .footer_column h2 {
            font-size: 16px;
            color: #fff;
            margin-bottom: 15px;
            text-transform: uppercase;
        }

        .footer_column ul {
            list-style: none;
        }

        .footer_column li {
            margin-bottom: 8px;
        }

        .footer_column a {
            color: #ccc;
            text-decoration: none;
            font-size: 14px;
            transition: color 0.3s;
        }

        .footer_column a:hover {
            color: #fff;
        }

        .footer_bottom {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #444;
            font-size: 13px;
            color: #999;
        }

        @media (max-width: 768px) {
            .nav_menu {
                flex-direction: column;
            }

            .nav_menu a {
                padding: 12px 20px;
            }

            h1 {
                font-size: 26px;
            }

            article h2 {
                font-size: 22px;
            }

            article h3 {
                font-size: 18px;
            }

            .links_section ul {
                column-count: 1;
            }

            .footer_links {
                flex-direction: column;
            }

            .footer_column {
                margin-bottom: 25px;
            }
        }

        @media (max-width: 480px) {
            main {
                padding: 20px 15px;
            }

            h1 {
                font-size: 24px;
            }

            .links_section {
                padding: 20px 15px;
            }

            .transition_section {
                padding: 15px;
            }
        }