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

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

        .container {
            max-width: 900px;
            margin: 0 auto;
            background-color: #fff;
            box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
        }

        header {
            background-color: #2c2c2c;
            padding: 2rem 2rem 1.5rem;
            border-bottom: 3px solid #e74c3c;
        }

        h1 {
            font-size: 2rem;
            color: #fff;
            font-weight: 300;
            letter-spacing: 1px;
            margin-bottom: 0.5rem;
        }

        .subtitle {
            color: #ccc;
            font-size: 0.9rem;
            font-style: italic;
        }

        article {
            padding: 3rem 2rem;
            background-color: #fff;
        }

        article h2 {
            color: #2c2c2c;
            font-size: 1.8rem;
            margin: 2rem 0 1rem;
            font-weight: 400;
            border-left: 4px solid #e74c3c;
            padding-left: 1rem;
        }

        article h3 {
            color: #444;
            font-size: 1.4rem;
            margin: 1.5rem 0 0.8rem;
            font-weight: 400;
        }

        article h4 {
            color: #555;
            font-size: 1.2rem;
            margin: 1.2rem 0 0.6rem;
            font-weight: 500;
        }

        article p {
            margin-bottom: 1.2rem;
            text-align: justify;
            color: #444;
            font-size: 1rem;
        }

        article strong {
            color: #2c2c2c;
            font-weight: 600;
        }

        article em {
            font-style: italic;
            color: #555;
        }

        article img {
            max-width: 100%;
            height: auto;
            display: block;
            margin: 2rem 0;
            border: 1px solid #ddd;
        }

        .transition-section {
            padding: 2rem;
            background-color: #f9f9f9;
            border-top: 1px solid #e0e0e0;
            border-bottom: 1px solid #e0e0e0;
        }

        .transition-section p {
            color: #555;
            line-height: 1.8;
            margin-bottom: 1rem;
        }

        .links-section {
            padding: 3rem 2rem;
            background-color: #fafafa;
        }

        .links-section h3 {
            color: #2c2c2c;
            font-size: 1.5rem;
            margin-bottom: 1rem;
            font-weight: 400;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e74c3c;
        }

        .links-section ul {
            list-style: none;
            column-count: 2;
            column-gap: 2rem;
            margin-bottom: 2.5rem;
        }

        .links-section li {
            margin-bottom: 0.8rem;
            break-inside: avoid;
        }

        .links-section a {
            color: #e74c3c;
            text-decoration: none;
            transition: color 0.3s ease;
            display: inline-block;
            position: relative;
            padding-left: 1rem;
        }

        .links-section a:before {
            content: "→";
            position: absolute;
            left: 0;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .links-section a:hover {
            color: #c0392b;
        }

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

        footer {
            background-color: #2c2c2c;
            padding: 1.5rem 2rem;
            text-align: center;
            color: #999;
            font-size: 0.85rem;
        }

        @media (max-width: 768px) {
            header {
                padding: 1.5rem 1.5rem 1rem;
            }

            h1 {
                font-size: 1.5rem;
            }

            article {
                padding: 2rem 1.5rem;
            }

            article h2 {
                font-size: 1.5rem;
            }

            article h3 {
                font-size: 1.2rem;
            }

            .transition-section {
                padding: 1.5rem;
            }

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

            .links-section ul {
                column-count: 1;
            }

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

        @media (max-width: 480px) {
            h1 {
                font-size: 1.3rem;
            }

            article {
                padding: 1.5rem 1rem;
            }

            article h2 {
                font-size: 1.3rem;
            }

            article p {
                font-size: 0.95rem;
            }

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