* {
            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: #f5f7fa;
        }

        header {
            background: linear-gradient(135deg, #13a 0%, #369 100%);
            color: white;
            padding: 2rem 0;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }

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

        h1 {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: white;
        }

        nav {
            background: #BDD2FF;
            border-bottom: 3px solid #369;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }

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

        .nav-menu {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 0;
        }

        .nav-menu li {
            position: relative;
        }

        .nav-menu a {
            display: block;
            padding: 1rem 1.5rem;
            color: #13a;
            text-decoration: none;
            border-left: 2px solid #369;
            transition: all 0.3s ease;
        }

        .nav-menu li:first-child a {
            border-left: none;
        }

        .nav-menu a:hover,
        .nav-menu a:focus {
            background: #CFDEFF;
            color: #13a;
        }

        main {
            max-width: 1200px;
            margin: 3rem auto;
            padding: 0 20px;
        }

        article {
            background: white;
            padding: 3rem;
            border-radius: 10px;
            box-shadow: 0 2px 20px rgba(0,0,0,0.08);
            margin-bottom: 3rem;
        }

        article h2 {
            color: #369;
            font-size: 2rem;
            margin: 2rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid #BDD2FF;
        }

        article h3 {
            color: #13a;
            font-size: 1.5rem;
            margin: 1.5rem 0 1rem;
        }

        article h4 {
            color: #369;
            font-size: 1.2rem;
            margin: 1.2rem 0 0.8rem;
        }

        article p {
            margin-bottom: 1.2rem;
            font-size: 1.05rem;
            color: #444;
        }

        article ul,
        article ol {
            margin: 1rem 0 1rem 2rem;
        }

        article li {
            margin-bottom: 0.5rem;
        }

        .transition-section {
            background: white;
            padding: 2.5rem 3rem;
            border-radius: 10px;
            box-shadow: 0 2px 20px rgba(0,0,0,0.08);
            margin-bottom: 3rem;
        }

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

        {% if links %}
        .links-section {
            background: white;
            padding: 3rem;
            border-radius: 10px;
            box-shadow: 0 2px 20px rgba(0,0,0,0.08);
            margin-bottom: 3rem;
        }

        .links-section h2 {
            color: #369;
            font-size: 2rem;
            margin-bottom: 2rem;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid #BDD2FF;
        }

        .links-section h3 {
            color: #13a;
            font-size: 1.4rem;
            margin: 2rem 0 1rem;
        }

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

        .links-section li {
            padding: 0;
        }

        .links-section a {
            color: #13a;
            text-decoration: none;
            padding: 0.5rem 0;
            display: inline-block;
            transition: all 0.2s ease;
            border-bottom: 2px solid transparent;
        }

        .links-section a:hover,
        .links-section a:focus {
            color: #369;
            border-bottom-color: #BDD2FF;
        }
        {% endif %}

        footer {
            background: linear-gradient(135deg, #369 0%, #13a 100%);
            color: white;
            text-align: center;
            padding: 2rem 0;
            margin-top: 4rem;
        }

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

        footer p {
            font-size: 1.1rem;
            margin: 0.5rem 0;
        }

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

            .nav-menu {
                flex-direction: column;
            }

            .nav-menu a {
                border-left: none;
                border-top: 1px solid #369;
                padding: 0.8rem 1rem;
            }

            article {
                padding: 1.5rem;
            }

            article h2 {
                font-size: 1.5rem;
            }

            article h3 {
                font-size: 1.3rem;
            }

            .transition-section {
                padding: 1.5rem;
            }

            {% if links %}
            .links-section {
                padding: 1.5rem;
            }

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

        @media (min-width: 769px) and (max-width: 1024px) {
            .nav-menu {
                justify-content: center;
            }
        }