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

        body {
            font-family: Arial, sans-serif;
            background-color: #ffffff;
            color: #333;
            line-height: 1.6;
            padding: 0;
            margin: 0;
        }

        header {
            background: linear-gradient(135deg, #6699ff 0%, #5588ee 100%);
            padding: 2rem 1rem;
            text-align: center;
            box-shadow: 0 2px 10px rgba(102, 153, 255, 0.3);
        }

        h1 {
            color: #ffffff;
            font-size: 2.5rem;
            font-weight: bold;
            margin: 0;
            text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.2);
        }

        main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 2rem 1rem;
        }

        article {
            background-color: #ffffff;
            padding: 2rem;
            margin-bottom: 2rem;
            border-left: 4px solid #6699ff;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
        }

        article h2 {
            color: #0033cc;
            margin-top: 1.5rem;
            margin-bottom: 1rem;
            font-size: 1.5rem;
        }

        article h3 {
            color: #6699ff;
            margin-top: 1.2rem;
            margin-bottom: 0.8rem;
            font-size: 1.2rem;
        }

        article p {
            margin-bottom: 1rem;
            text-align: justify;
        }

        article a {
            color: #0033cc;
            text-decoration: none;
            border-bottom: 1px solid transparent;
            transition: border-bottom 0.3s ease;
        }

        article a:hover {
            border-bottom: 1px solid #0033cc;
        }

        article a:visited {
            color: #D7D7FF;
        }

        .transition-section {
            background-color: #f8f9ff;
            padding: 2rem;
            margin-bottom: 2rem;
            border-radius: 8px;
            border: 1px solid #e0e6ff;
        }

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

        .links-section {
            background: linear-gradient(to bottom, #f8f9ff 0%, #ffffff 100%);
            padding: 2rem;
            border-radius: 8px;
            border: 2px solid #6699ff;
            box-shadow: 0 4px 15px rgba(102, 153, 255, 0.15);
        }

        .links-section h2 {
            color: #0033cc;
            margin-bottom: 1.5rem;
            font-size: 1.8rem;
            text-align: center;
        }

        .links-section h3 {
            color: #6699ff;
            margin-top: 2rem;
            margin-bottom: 1rem;
            font-size: 1.3rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #6699ff;
        }

        .links-section ul {
            list-style: none;
            column-count: 2;
            column-gap: 2rem;
            margin-bottom: 1.5rem;
        }

        .links-section li {
            margin-bottom: 0.8rem;
            break-inside: avoid;
            padding-left: 1.5rem;
            position: relative;
        }

        .links-section li:before {
            content: "▸";
            position: absolute;
            left: 0;
            color: #6699ff;
            font-weight: bold;
        }

        .links-section a {
            color: #0033cc;
            text-decoration: none;
            transition: color 0.3s ease, padding-left 0.3s ease;
            display: inline-block;
        }

        .links-section a:hover {
            color: #6699ff;
            padding-left: 5px;
        }

        .links-section a:visited {
            color: #8888cc;
        }

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

            article {
                padding: 1.5rem;
            }

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

            main {
                padding: 1rem;
            }

            .transition-section {
                padding: 1.5rem;
            }

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

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

            header {
                padding: 1.5rem 1rem;
            }

            article {
                padding: 1rem;
            }

            article h2 {
                font-size: 1.3rem;
            }

            article h3 {
                font-size: 1.1rem;
            }

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

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