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

        body {
            font-family: Verdana, Geneva, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f5f5f5;
        }

        header {
            background-color: #fff;
            padding: 2rem 1rem;
            text-align: center;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }

        nav {
            background-color: #2c2c2c;
            padding: 1rem;
            display: flex;
            justify-content: center;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
        }

        nav a {
            color: #fff;
            text-decoration: none;
            padding: 0.5rem 1.5rem;
            transition: background-color 0.3s ease;
            border-radius: 3px;
        }

        nav a:hover {
            background-color: #444;
        }

        nav span.separator {
            color: #666;
            user-select: none;
        }

        main {
            max-width: 900px;
            margin: 3rem auto;
            padding: 0 1.5rem;
        }

        h1 {
            font-size: 2rem;
            color: #2c2c2c;
            margin-bottom: 2rem;
            text-align: center;
            font-weight: bold;
        }

        article {
            background-color: #fff;
            padding: 2.5rem;
            margin-bottom: 2rem;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.08);
        }

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

        article strong {
            color: #2c2c2c;
        }

        article h2,
        article h3,
        article h4 {
            margin-top: 1.5rem;
            margin-bottom: 1rem;
            color: #2c2c2c;
        }

        .transition-section {
            background-color: #fff;
            padding: 2rem 2.5rem;
            margin-bottom: 2rem;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.08);
        }

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

        .links-section {
            background-color: #fff;
            padding: 2.5rem;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.08);
            margin-bottom: 2rem;
        }

        .links-section h3 {
            color: #2c2c2c;
            margin-bottom: 1rem;
            font-size: 1.3rem;
            margin-top: 2rem;
        }

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

        .links-section ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 0.8rem 2rem;
            margin-bottom: 1.5rem;
        }

        .links-section ul li {
            padding-left: 0;
        }

        .links-section ul li a {
            color: #0066cc;
            text-decoration: none;
            transition: color 0.3s ease;
            display: inline-block;
        }

        .links-section ul li a:hover {
            color: #004499;
            text-decoration: underline;
        }

        footer {
            background-color: #2c2c2c;
            color: #ccc;
            text-align: center;
            padding: 1.5rem;
            margin-top: 3rem;
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 1.6rem;
            }

            article {
                padding: 1.5rem;
            }

            .transition-section {
                padding: 1.5rem;
            }

            .links-section {
                padding: 1.5rem;
            }

            .links-section ul {
                grid-template-columns: 1fr;
                gap: 0.6rem;
            }

            nav {
                flex-direction: column;
                gap: 0.5rem;
            }

            nav span.separator {
                display: none;
            }
        }

        @media (max-width: 480px) {
            main {
                margin: 1.5rem auto;
                padding: 0 1rem;
            }

            h1 {
                font-size: 1.4rem;
                margin-bottom: 1.5rem;
            }

            article {
                padding: 1.2rem;
            }

            .transition-section {
                padding: 1.2rem;
            }

            .links-section {
                padding: 1.2rem;
            }

            .links-section h3 {
                font-size: 1.1rem;
            }
        }