* {
            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: #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);
        }

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

        nav {
            background-color: #fff;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 100;
        }

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

        nav ul {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            padding: 0.5rem 0;
        }

        nav li {
            margin: 0.5rem 1rem;
        }

        nav a {
            color: #667eea;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s ease;
        }

        nav a:hover {
            color: #764ba2;
        }

        main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 2rem 1rem;
        }

        h1 {
            font-size: 2.5rem;
            margin-bottom: 2rem;
            color: #2c3e50;
            line-height: 1.2;
        }

        article {
            background: white;
            padding: 2rem;
            margin-bottom: 2rem;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }

        article h2 {
            color: #667eea;
            margin-top: 2rem;
            margin-bottom: 1rem;
            font-size: 1.8rem;
        }

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

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

        article p {
            margin-bottom: 1rem;
            color: #555;
            font-size: 1.05rem;
        }

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

        article li {
            margin-bottom: 0.5rem;
            color: #555;
        }

        .transition-section {
            background: white;
            padding: 2rem;
            margin-bottom: 2rem;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }

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

        {% if links %}
        .links-section {
            background: white;
            padding: 2rem;
            margin-bottom: 2rem;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }

        .links-section h2 {
            color: #667eea;
            margin-bottom: 1.5rem;
            font-size: 1.8rem;
        }

        .links-section h3 {
            color: #764ba2;
            margin-top: 1.5rem;
            margin-bottom: 1rem;
            font-size: 1.4rem;
        }

        .links-section ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1rem;
            margin-bottom: 2rem;
        }

        .links-section li {
            padding: 0;
        }

        .links-section a {
            color: #667eea;
            text-decoration: none;
            padding: 0.75rem 1rem;
            display: block;
            border-left: 3px solid #667eea;
            background: #f8f9fa;
            transition: all 0.3s ease;
            border-radius: 4px;
        }

        .links-section a:hover {
            background: #e9ecef;
            border-left-color: #764ba2;
            color: #764ba2;
            transform: translateX(5px);
        }
        {% endif %}

        footer {
            background: #2c3e50;
            color: white;
            padding: 2rem 1rem;
            text-align: center;
            margin-top: 3rem;
        }

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

        footer ul {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            margin-top: 1rem;
        }

        footer li {
            margin: 0.5rem 1rem;
        }

        footer a {
            color: #ecf0f1;
            text-decoration: none;
            transition: color 0.3s ease;
        }

        footer a:hover {
            color: #667eea;
        }

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

            article, .transition-section, .links-section {
                padding: 1.5rem;
            }

            nav ul {
                flex-direction: column;
                align-items: center;
            }

            nav li {
                margin: 0.3rem 0;
            }

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

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

            article h2 {
                font-size: 1.5rem;
            }

            article h3 {
                font-size: 1.2rem;
            }

            article, .transition-section, .links-section {
                padding: 1rem;
            }

            header {
                padding: 1.5rem 1rem;
            }
        }