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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.6;
            color: #2c3e50;
            background-color: #f8f9fa;
        }

        header {
            background-color: #1a252f;
            padding: 1.5rem 0;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }

        .logo-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
        }

        .logo {
            color: #ffffff;
            font-size: 1.8rem;
            font-weight: 700;
            text-decoration: none;
            letter-spacing: -0.5px;
        }

        nav {
            background-color: #2c3e50;
            padding: 0;
            border-bottom: 3px solid #3498db;
        }

        nav ul {
            list-style: none;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
            display: flex;
            flex-wrap: wrap;
        }

        nav ul li {
            margin: 0;
        }

        nav ul li a {
            display: block;
            color: #ecf0f1;
            text-decoration: none;
            padding: 1rem 1.5rem;
            transition: background-color 0.3s ease;
        }

        nav ul li a:hover {
            background-color: #34495e;
        }

        main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 3rem 2rem;
            background-color: #ffffff;
            min-height: calc(100vh - 400px);
        }

        h1 {
            color: #1a252f;
            font-size: 2.5rem;
            margin-bottom: 2rem;
            padding-bottom: 1rem;
            border-bottom: 4px solid #3498db;
        }

        article {
            margin-bottom: 3rem;
        }

        article h2 {
            color: #2c3e50;
            font-size: 2rem;
            margin-top: 2rem;
            margin-bottom: 1rem;
        }

        article h3 {
            color: #34495e;
            font-size: 1.5rem;
            margin-top: 1.5rem;
            margin-bottom: 0.8rem;
        }

        article h4 {
            color: #34495e;
            font-size: 1.25rem;
            margin-top: 1.2rem;
            margin-bottom: 0.6rem;
        }

        article p {
            margin-bottom: 1.2rem;
            font-size: 1.05rem;
            line-height: 1.8;
        }

        .transition-content {
            margin: 2.5rem 0;
            padding: 2rem;
            background-color: #f8f9fa;
            border-left: 4px solid #3498db;
        }

        .transition-content p {
            font-size: 1.05rem;
            line-height: 1.8;
            margin-bottom: 1rem;
        }

        .transition-content p:last-child {
            margin-bottom: 0;
        }

        .links-section {
            margin-top: 3rem;
            padding: 2.5rem;
            background-color: #f8f9fa;
            border-radius: 8px;
            border: 1px solid #e1e8ed;
        }

        .links-section h3 {
            color: #1a252f;
            font-size: 1.5rem;
            margin-top: 2rem;
            margin-bottom: 1rem;
        }

        .links-section h3:first-child {
            margin-top: 0;
        }

        .links-section ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 0.8rem 2rem;
            margin-bottom: 2rem;
        }

        .links-section ul li {
            margin: 0;
        }

        .links-section ul li a {
            color: #3498db;
            text-decoration: none;
            transition: color 0.3s ease;
            display: inline-block;
            padding: 0.3rem 0;
        }

        .links-section ul li a:hover {
            color: #2c3e50;
            text-decoration: underline;
        }

        footer {
            background-color: #1a252f;
            color: #ecf0f1;
            padding: 2rem 0;
            margin-top: 4rem;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
            text-align: center;
        }

        @media (max-width: 768px) {
            header {
                padding: 1rem 0;
            }

            .logo-container {
                padding: 0 1rem;
            }

            .logo {
                font-size: 1.5rem;
            }

            nav ul {
                padding: 0 1rem;
                flex-direction: column;
            }

            nav ul li a {
                padding: 0.8rem 1rem;
            }

            main {
                padding: 2rem 1rem;
            }

            h1 {
                font-size: 2rem;
            }

            article h2 {
                font-size: 1.6rem;
            }

            article h3 {
                font-size: 1.3rem;
            }

            .links-section {
                padding: 1.5rem;
            }

            .links-section ul {
                grid-template-columns: 1fr;
                gap: 0.6rem;
            }

            .transition-content {
                padding: 1.5rem;
            }
        }

        @media (max-width: 480px) {
            h1 {
                font-size: 1.75rem;
            }

            article h2 {
                font-size: 1.4rem;
            }

            article p {
                font-size: 1rem;
            }
        }