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

        :root {
            --primary-color: #2c3e50;
            --secondary-color: #34495e;
            --accent-color: #3498db;
            --text-color: #333;
            --light-bg: #f8f9fa;
            --border-color: #e0e0e0;
            --white: #ffffff;
            --link-color: #2980b9;
            --link-hover: #1a5276;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--white);
        }

        header {
            background-color: var(--primary-color);
            color: var(--white);
            padding: 2rem 0;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }

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

        h1 {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--white);
            text-align: center;
            margin: 0;
            padding: 1rem 0;
        }

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

        article {
            background-color: var(--white);
            padding: 2rem 0;
            margin-bottom: 3rem;
        }

        article h2 {
            font-size: 2rem;
            color: var(--primary-color);
            margin: 2rem 0 1rem;
            font-weight: 600;
        }

        article h3 {
            font-size: 1.5rem;
            color: var(--secondary-color);
            margin: 1.5rem 0 1rem;
            font-weight: 600;
        }

        article h4 {
            font-size: 1.25rem;
            color: var(--secondary-color);
            margin: 1.25rem 0 0.75rem;
            font-weight: 600;
        }

        article p {
            margin-bottom: 1.25rem;
            font-size: 1.05rem;
            line-height: 1.8;
            color: var(--text-color);
        }

        article ul,
        article ol {
            margin: 1rem 0 1.5rem 2rem;
            line-height: 1.8;
        }

        article li {
            margin-bottom: 0.5rem;
            font-size: 1.05rem;
        }

        .transition-section {
            background-color: var(--light-bg);
            padding: 2.5rem;
            margin: 3rem 0;
            border-left: 4px solid var(--accent-color);
            border-radius: 4px;
        }

        .transition-section p {
            font-size: 1.05rem;
            line-height: 1.8;
            margin-bottom: 1rem;
            color: var(--text-color);
        }

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

        .links-section {
            background-color: var(--light-bg);
            padding: 3rem 2.5rem;
            margin: 3rem 0;
            border-radius: 8px;
            border: 1px solid var(--border-color);
        }

        .links-section h2 {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 2rem;
            font-weight: 600;
        }

        .links-section h3 {
            font-size: 1.35rem;
            color: var(--secondary-color);
            margin: 2rem 0 1rem;
            font-weight: 600;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--accent-color);
        }

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

        .links-section ul {
            list-style: none;
            margin: 0 0 2rem 0;
            padding: 0;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 0.75rem 2rem;
        }

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

        .links-section a {
            color: var(--link-color);
            text-decoration: none;
            font-size: 1.05rem;
            display: inline-block;
            transition: color 0.2s ease, padding-left 0.2s ease;
            position: relative;
        }

        .links-section a:hover {
            color: var(--link-hover);
            padding-left: 8px;
        }

        .links-section a::before {
            content: "→";
            position: absolute;
            left: -8px;
            opacity: 0;
            transition: opacity 0.2s ease;
        }

        .links-section a:hover::before {
            opacity: 1;
        }

        footer {
            background-color: var(--primary-color);
            color: var(--white);
            padding: 2rem 0;
            margin-top: 4rem;
            box-shadow: 0 -2px 4px rgba(0,0,0,0.1);
        }

        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            text-align: center;
        }

        .footer-container p {
            margin: 0;
            font-size: 0.95rem;
            opacity: 0.9;
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 1.85rem;
                padding: 0.75rem 0;
            }

            header {
                padding: 1.5rem 0;
            }

            main {
                padding: 2rem 15px;
            }

            article {
                padding: 1rem 0;
            }

            article h2 {
                font-size: 1.65rem;
                margin: 1.5rem 0 0.85rem;
            }

            article h3 {
                font-size: 1.35rem;
                margin: 1.25rem 0 0.75rem;
            }

            article h4 {
                font-size: 1.15rem;
            }

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

            .transition-section {
                padding: 1.5rem;
                margin: 2rem 0;
            }

            .links-section {
                padding: 2rem 1.5rem;
                margin: 2rem 0;
            }

            .links-section h2 {
                font-size: 1.65rem;
                margin-bottom: 1.5rem;
            }

            .links-section h3 {
                font-size: 1.25rem;
                margin: 1.5rem 0 0.85rem;
            }

            .links-section ul {
                grid-template-columns: 1fr;
                gap: 0.65rem;
            }

            .links-section a {
                font-size: 1rem;
            }

            footer {
                margin-top: 3rem;
            }
        }

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

            article h2 {
                font-size: 1.45rem;
            }

            article h3 {
                font-size: 1.25rem;
            }

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

            .links-section h2 {
                font-size: 1.45rem;
            }

            .links-section h3 {
                font-size: 1.15rem;
            }
        }