* {
            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: #f8f8f8;
        }

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

        header {
            background-color: #fff;
            padding: 30px 0;
            border-bottom: 1px solid #e0e0e0;
        }

        h1 {
            font-size: 2.5rem;
            color: #099;
            margin: 40px 0 30px;
            font-weight: 700;
            line-height: 1.2;
        }

        article {
            background-color: #fff;
            padding: 40px;
            margin-bottom: 40px;
            border-radius: 2px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.05);
        }

        article h2 {
            font-size: 1.8rem;
            color: #444;
            margin: 30px 0 15px;
            font-weight: 600;
        }

        article h3 {
            font-size: 1.4rem;
            color: #2e67a8;
            margin: 25px 0 12px;
            font-weight: 600;
        }

        article h4 {
            font-size: 1.2rem;
            color: #555;
            margin: 20px 0 10px;
            font-weight: 600;
        }

        article p {
            margin-bottom: 16px;
            color: #555;
            font-size: 1.05rem;
        }

        article ul, article ol {
            margin: 15px 0 15px 25px;
        }

        article li {
            margin-bottom: 8px;
            color: #555;
        }

        .transition-section {
            background-color: #fff;
            padding: 35px 40px;
            margin-bottom: 40px;
            border-radius: 2px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.05);
        }

        .transition-section p {
            color: #555;
            font-size: 1.05rem;
            margin-bottom: 16px;
        }

        .links-section {
            background-color: #fff;
            padding: 40px;
            margin-bottom: 40px;
            border-radius: 2px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.05);
        }

        .links-section h3 {
            font-size: 1.5rem;
            color: #099;
            margin-bottom: 20px;
            font-weight: 600;
            border-bottom: 2px solid #099;
            padding-bottom: 10px;
        }

        .links-section ul {
            list-style: none;
            columns: 2;
            column-gap: 40px;
            margin-bottom: 35px;
        }

        .links-section ul:last-child {
            margin-bottom: 0;
        }

        .links-section li {
            margin-bottom: 12px;
            break-inside: avoid;
        }

        .links-section a {
            color: #2e67a8;
            text-decoration: none;
            transition: color 0.3s ease;
            display: inline-block;
            position: relative;
        }

        .links-section a:hover {
            color: #099;
        }

        .links-section a::before {
            content: '→';
            margin-right: 8px;
            color: #099;
        }

        footer {
            background-color: #444;
            color: #fff;
            padding: 30px 0;
            margin-top: 60px;
        }

        footer p {
            text-align: center;
            font-size: 0.9rem;
            opacity: 0.9;
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 2rem;
                margin: 30px 0 20px;
            }

            article {
                padding: 25px 20px;
            }

            article h2 {
                font-size: 1.5rem;
            }

            article h3 {
                font-size: 1.25rem;
            }

            .transition-section {
                padding: 25px 20px;
            }

            .links-section {
                padding: 25px 20px;
            }

            .links-section ul {
                columns: 1;
            }

            .links-section h3 {
                font-size: 1.3rem;
            }
        }

        @media (max-width: 480px) {
            h1 {
                font-size: 1.6rem;
            }

            article {
                padding: 20px 15px;
            }

            article h2 {
                font-size: 1.3rem;
            }

            article p, .transition-section p {
                font-size: 1rem;
            }

            .links-section {
                padding: 20px 15px;
            }
        }