* {
            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: #f8f9fa;
        }

        header {
            background: #fff;
            border-bottom: 1px solid #e0e0e0;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 4px rgba(0,0,0,0.04);
        }

        nav {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 2rem;
        }

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

        main {
            background: #fff;
            margin: 2rem auto;
            max-width: 1200px;
            border-radius: 8px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.08);
            overflow: hidden;
        }

        h1 {
            font-size: 2.5rem;
            color: #1a1a1a;
            margin-bottom: 1.5rem;
            padding: 3rem 3rem 0;
            font-weight: 600;
            line-height: 1.2;
        }

        article {
            padding: 0 3rem 2rem;
        }

        article h2 {
            font-size: 1.875rem;
            color: #2c3e50;
            margin: 2rem 0 1rem;
            font-weight: 600;
        }

        article h3 {
            font-size: 1.5rem;
            color: #34495e;
            margin: 1.75rem 0 0.875rem;
            font-weight: 600;
        }

        article h4 {
            font-size: 1.25rem;
            color: #34495e;
            margin: 1.5rem 0 0.75rem;
            font-weight: 600;
        }

        article p {
            margin-bottom: 1.25rem;
            color: #444;
            font-size: 1.0625rem;
        }

        article ul, article ol {
            margin: 1rem 0 1.5rem 1.5rem;
            color: #444;
        }

        article li {
            margin-bottom: 0.5rem;
            line-height: 1.7;
        }

        .transition-section {
            background: #f8f9fa;
            padding: 2.5rem 3rem;
            margin: 2rem 0 0;
            border-top: 1px solid #e0e0e0;
        }

        .transition-section p {
            color: #555;
            font-size: 1.0625rem;
            margin-bottom: 1rem;
        }

        .links-section {
            background: #fff;
            padding: 3rem;
            border-top: 1px solid #e0e0e0;
        }

        .links-section h3 {
            font-size: 1.375rem;
            color: #2c3e50;
            margin-bottom: 1rem;
            font-weight: 600;
        }

        .links-section ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 0.75rem 2rem;
            margin-bottom: 2.5rem;
        }

        .links-section li {
            margin: 0;
        }

        .links-section a {
            color: #408bd1;
            text-decoration: none;
            transition: color 0.2s ease;
            display: inline-block;
            line-height: 1.6;
        }

        .links-section a:hover {
            color: #2c6ba6;
            text-decoration: underline;
        }

        footer {
            background: #2c3e50;
            color: #ecf0f1;
            padding: 2rem 0;
            margin-top: 3rem;
        }

        footer .container {
            text-align: center;
        }

        footer p {
            font-size: 0.9375rem;
            opacity: 0.9;
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 2rem;
                padding: 2rem 1.5rem 0;
            }

            article {
                padding: 0 1.5rem 1.5rem;
            }

            article h2 {
                font-size: 1.625rem;
            }

            article h3 {
                font-size: 1.375rem;
            }

            article h4 {
                font-size: 1.125rem;
            }

            .transition-section {
                padding: 2rem 1.5rem;
            }

            .links-section {
                padding: 2rem 1.5rem;
            }

            .links-section ul {
                grid-template-columns: 1fr;
                gap: 0.5rem;
            }

            .container {
                padding: 0 1.5rem;
            }

            nav {
                padding: 0 1.5rem;
            }
        }

        @media (max-width: 480px) {
            h1 {
                font-size: 1.75rem;
                padding: 1.5rem 1rem 0;
            }

            article {
                padding: 0 1rem 1rem;
            }

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

            .transition-section {
                padding: 1.5rem 1rem;
            }

            .links-section {
                padding: 1.5rem 1rem;
            }

            .container {
                padding: 0 1rem;
            }

            nav {
                padding: 0 1rem;
            }
        }