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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f8f9fa;
        }

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

        header {
            background-color: #fff;
            border-bottom: 3px solid #0066cc;
            padding: 20px 0;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }

        .header-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 20px;
        }

        .site-title {
            font-size: 1.5rem;
            font-weight: 700;
            color: #0066cc;
            flex: 1;
            min-width: 250px;
        }

        .site-subtitle {
            font-size: 1rem;
            color: #666;
            margin-top: 5px;
        }

        main {
            background-color: #fff;
            margin: 30px auto;
            padding: 40px;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }

        h1 {
            font-size: 2.5rem;
            color: #0066cc;
            margin-bottom: 30px;
            padding-bottom: 15px;
            border-bottom: 3px solid #0066cc;
            font-weight: 700;
        }

        article {
            margin-bottom: 40px;
        }

        article h2 {
            font-size: 1.8rem;
            color: #0066cc;
            margin: 30px 0 15px;
            font-weight: 600;
        }

        article h3 {
            font-size: 1.4rem;
            color: #333;
            margin: 25px 0 12px;
            font-weight: 600;
        }

        article h4 {
            font-size: 1.2rem;
            color: #333;
            margin: 20px 0 10px;
            font-weight: 600;
        }

        article p {
            margin-bottom: 15px;
            color: #444;
            text-align: justify;
        }

        article a {
            color: #0066cc;
            text-decoration: none;
            border-bottom: 1px solid transparent;
            transition: border-color 0.3s;
        }

        article a:hover {
            border-bottom-color: #0066cc;
        }

        .transition-section {
            margin: 40px 0;
            padding: 30px;
            background-color: #f0f7ff;
            border-left: 4px solid #0066cc;
            border-radius: 4px;
        }

        .transition-section p {
            color: #444;
            margin-bottom: 15px;
        }

        .links-section {
            margin-top: 50px;
            padding: 40px;
            background-color: #fafbfc;
            border-radius: 8px;
            border: 1px solid #e1e4e8;
        }

        .links-section h3 {
            font-size: 1.5rem;
            color: #0066cc;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #0066cc;
            font-weight: 600;
        }

        .links-section ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 12px 30px;
            margin-bottom: 35px;
        }

        .links-section ul:last-child {
            margin-bottom: 0;
        }

        .links-section li {
            padding-left: 20px;
            position: relative;
        }

        .links-section li:before {
            content: "▸";
            position: absolute;
            left: 0;
            color: #0066cc;
            font-weight: bold;
        }

        .links-section a {
            color: #0066cc;
            text-decoration: none;
            transition: color 0.3s;
            display: inline-block;
        }

        .links-section a:hover {
            color: #004999;
            text-decoration: underline;
        }

        footer {
            background-color: #2c3e50;
            color: #ecf0f1;
            padding: 30px 0;
            margin-top: 50px;
        }

        .footer-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .footer-left {
            flex: 1;
            min-width: 200px;
        }

        .footer-right {
            text-align: right;
        }

        .footer-right a {
            color: #ecf0f1;
            text-decoration: none;
            margin-left: 15px;
        }

        .footer-right a:hover {
            text-decoration: underline;
        }

        @media (max-width: 768px) {
            main {
                padding: 25px 20px;
                margin: 20px auto;
            }

            h1 {
                font-size: 2rem;
            }

            article h2 {
                font-size: 1.5rem;
            }

            article h3 {
                font-size: 1.3rem;
            }

            .links-section {
                padding: 25px 20px;
            }

            .links-section ul {
                grid-template-columns: 1fr;
                gap: 10px;
            }

            .footer-content {
                flex-direction: column;
                text-align: center;
            }

            .footer-right {
                text-align: center;
            }

            .footer-right a {
                margin: 0 10px;
            }
        }

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

            .site-title {
                font-size: 1.2rem;
            }

            main {
                padding: 20px 15px;
            }

            .transition-section {
                padding: 20px;
            }
        }