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

        body {
            font-family: 'Lucida Grande', Helvetica, Verdana, sans-serif;
            font-size: 12px;
            line-height: 1.6;
            color: #333;
            background-color: #dbefff;
            background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=');
        }

        .wrapper {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            position: relative;
        }

        header {
            background: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=') repeat-x;
            padding: 20px 0;
            margin-bottom: 20px;
        }

        .logo {
            width: 288px;
            height: 65px;
            background-color: rgba(255, 255, 255, 0.1);
            display: block;
        }

        nav {
            background: linear-gradient(to bottom, #f5f5f5, #e0e0e0);
            border-bottom: 1px solid #bbb;
            margin-bottom: 30px;
        }

        nav ul {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            padding: 0;
            margin: 0;
        }

        nav ul li {
            position: relative;
        }

        nav ul li a {
            display: block;
            padding: 15px 20px;
            text-decoration: none;
            color: #333;
            font-weight: bold;
            font-size: 14px;
            border-right: 1px solid #ccc;
        }

        nav ul li a:hover {
            background-color: rgba(255, 255, 255, 0.5);
        }

        main {
            background: #fff;
            padding: 30px;
            margin: 0 auto 30px;
            max-width: 1200px;
            border-radius: 5px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        h1 {
            font-family: Georgia, Times, serif;
            font-size: 2.5em;
            line-height: 1.2;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #0779ab;
            color: #0779ab;
        }

        h2 {
            font-size: 2em;
            line-height: 1.2;
            margin: 25px 0 15px;
            color: #2d8da4;
        }

        h3 {
            font-size: 1.5em;
            margin: 20px 0 10px;
            color: #0779ab;
        }

        h4 {
            font-size: 1.2em;
            margin: 15px 0 10px;
            color: #333;
        }

        article {
            margin-bottom: 40px;
        }

        article p {
            margin: 15px 0;
            line-height: 1.8;
        }

        article ul,
        article ol {
            margin: 15px 0 15px 25px;
            line-height: 1.8;
        }

        article li {
            margin-bottom: 8px;
        }

        .transition-section {
            margin: 40px 0;
            padding: 20px;
            background-color: #f9f9f9;
            border-left: 4px solid #0779ab;
        }

        .transition-section p {
            margin: 10px 0;
            line-height: 1.8;
        }

        .links-section {
            background: #fff;
            padding: 30px;
            margin-top: 40px;
            border-top: 3px solid #0779ab;
        }

        .links-section h3 {
            font-size: 1.4em;
            margin-bottom: 15px;
            color: #0779ab;
            padding-bottom: 8px;
            border-bottom: 1px solid #e0e0e0;
        }

        .links-section ul {
            list-style: none;
            margin: 0;
            padding: 0;
            column-count: 2;
            column-gap: 30px;
        }

        .links-section ul li {
            margin-bottom: 10px;
            break-inside: avoid;
        }

        .links-section ul li a {
            color: #0779ab;
            text-decoration: none;
            padding: 5px 0;
            display: inline-block;
            position: relative;
            padding-left: 15px;
        }

        .links-section ul li a:before {
            content: "→";
            position: absolute;
            left: 0;
            color: #0779ab;
        }

        .links-section ul li a:hover {
            color: #2d8da4;
            text-decoration: underline;
        }

        footer {
            background: #2d2d2d;
            color: #999;
            padding: 20px;
            text-align: center;
            margin-top: 40px;
        }

        footer p {
            margin: 5px 0;
            font-size: 11px;
        }

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

            nav ul li a {
                border-right: none;
                border-bottom: 1px solid #ccc;
            }

            main {
                padding: 20px;
            }

            h1 {
                font-size: 2em;
            }

            h2 {
                font-size: 1.6em;
            }

            h3 {
                font-size: 1.3em;
            }

            .links-section ul {
                column-count: 1;
            }
        }

        @media (max-width: 480px) {
            h1 {
                font-size: 1.6em;
            }

            h2 {
                font-size: 1.4em;
            }

            h3 {
                font-size: 1.2em;
            }

            main {
                padding: 15px;
            }

            .wrapper {
                padding: 0 10px;
            }
        }