* {
            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: #333;
            background-color: #f5f5f5;
        }

        header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 2rem 1rem;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }

        h1 {
            font-size: 2.5rem;
            font-weight: 700;
            text-align: center;
            margin: 0;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
        }

        article {
            background: white;
            padding: 2.5rem;
            margin: 2rem auto;
            max-width: 1200px;
            border-radius: 8px;
            box-shadow: 0 2px 20px rgba(0,0,0,0.08);
        }

        article h2 {
            color: #667eea;
            font-size: 1.8rem;
            margin-top: 2rem;
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e0e0e0;
        }

        article h3 {
            color: #764ba2;
            font-size: 1.4rem;
            margin-top: 1.5rem;
            margin-bottom: 0.8rem;
        }

        article h4 {
            color: #555;
            font-size: 1.2rem;
            margin-top: 1.2rem;
            margin-bottom: 0.6rem;
        }

        article p {
            margin-bottom: 1rem;
            color: #444;
            font-size: 1.05rem;
        }

        article ul, article ol {
            margin-left: 2rem;
            margin-bottom: 1rem;
        }

        article li {
            margin-bottom: 0.5rem;
        }

        .transition-section {
            background: white;
            padding: 2rem 2.5rem;
            margin: 2rem auto;
            max-width: 1200px;
            border-radius: 8px;
            box-shadow: 0 2px 20px rgba(0,0,0,0.08);
        }

        .transition-section p {
            color: #555;
            font-size: 1.05rem;
            line-height: 1.7;
            margin-bottom: 1rem;
        }

        .links-section {
            background: white;
            padding: 2.5rem;
            margin: 2rem auto 3rem;
            max-width: 1200px;
            border-radius: 8px;
            box-shadow: 0 2px 20px rgba(0,0,0,0.08);
        }

        .links-section h2 {
            color: #667eea;
            font-size: 2rem;
            margin-bottom: 2rem;
            text-align: center;
        }

        .links-section h3 {
            color: #764ba2;
            font-size: 1.3rem;
            margin-top: 2rem;
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e0e0e0;
        }

        .links-section ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 0.8rem;
            margin-bottom: 1.5rem;
        }

        .links-section li {
            padding: 0;
        }

        .links-section a {
            display: block;
            padding: 0.8rem 1rem;
            color: #667eea;
            text-decoration: none;
            border-left: 3px solid #667eea;
            background: #f8f9ff;
            transition: all 0.3s ease;
            border-radius: 4px;
        }

        .links-section a:hover {
            background: #667eea;
            color: white;
            transform: translateX(5px);
            box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
        }

        footer {
            background: #2d3748;
            color: #cbd5e0;
            text-align: center;
            padding: 1.5rem 1rem;
            margin-top: 3rem;
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 1.8rem;
            }

            article, .transition-section, .links-section {
                padding: 1.5rem;
                margin: 1rem;
                border-radius: 6px;
            }

            article h2 {
                font-size: 1.5rem;
            }

            article h3 {
                font-size: 1.2rem;
            }

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

            .links-section h3 {
                font-size: 1.2rem;
            }
        }

        @media (max-width: 480px) {
            header {
                padding: 1.5rem 1rem;
            }

            h1 {
                font-size: 1.5rem;
            }

            article, .transition-section, .links-section {
                padding: 1.2rem;
            }
        }