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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #1D4C6C;
            color: #333;
            line-height: 1.6;
        }

        header {
            background: linear-gradient(135deg, #2B5F7F 0%, #1D4C6C 100%);
            padding: 20px 0;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
        }

        .header-content {
            max-width: 955px;
            margin: 0 auto;
            padding: 0 20px;
        }

        h1 {
            color: #ffffff;
            font-size: 2.5rem;
            text-align: center;
            padding: 30px 20px;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
            font-weight: 300;
            letter-spacing: 1px;
        }

        nav {
            background-color: rgba(255, 255, 255, 0.95);
            border-radius: 8px;
            margin-top: 20px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }

        nav ul {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            padding: 0;
        }

        nav ul li {
            margin: 0;
        }

        nav ul li a {
            display: block;
            padding: 15px 20px;
            color: #1D4C6C;
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
            border-bottom: 3px solid transparent;
        }

        nav ul li a:hover {
            background-color: #f0f8ff;
            color: #2B5F7F;
            border-bottom-color: #2B5F7F;
        }

        main {
            max-width: 955px;
            margin: 40px auto;
            background-color: #ffffff;
            border-radius: 12px;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
            overflow: hidden;
        }

        article {
            padding: 40px;
        }

        article h2 {
            color: #1D4C6C;
            margin-top: 30px;
            margin-bottom: 15px;
            font-size: 1.8rem;
            border-left: 4px solid #2B5F7F;
            padding-left: 15px;
        }

        article h3 {
            color: #2B5F7F;
            margin-top: 25px;
            margin-bottom: 12px;
            font-size: 1.4rem;
        }

        article h4 {
            color: #3A6B8C;
            margin-top: 20px;
            margin-bottom: 10px;
            font-size: 1.2rem;
        }

        article p {
            margin-bottom: 20px;
            color: #555;
            font-size: 1rem;
        }

        .transition-section {
            padding: 30px 40px;
            background-color: #f8f9fa;
            border-top: 1px solid #e0e0e0;
        }

        .transition-section p {
            color: #555;
            margin-bottom: 15px;
            font-size: 1rem;
        }

        .links-section {
            padding: 40px;
            background: linear-gradient(to bottom, #f8f9fa 0%, #ffffff 100%);
            border-top: 1px solid #e0e0e0;
        }

        .links-section h3 {
            color: #1D4C6C;
            margin-top: 30px;
            margin-bottom: 20px;
            font-size: 1.6rem;
            border-bottom: 2px solid #2B5F7F;
            padding-bottom: 10px;
        }

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

        .links-section ul {
            list-style: none;
            column-count: 2;
            column-gap: 30px;
            margin-bottom: 30px;
        }

        .links-section ul li {
            break-inside: avoid;
            margin-bottom: 12px;
            padding-left: 20px;
            position: relative;
        }

        .links-section ul li:before {
            content: "→";
            position: absolute;
            left: 0;
            color: #2B5F7F;
            font-weight: bold;
        }

        .links-section ul li a {
            color: #1D4C6C;
            text-decoration: none;
            transition: all 0.3s ease;
            display: inline-block;
        }

        .links-section ul li a:hover {
            color: #2B5F7F;
            padding-left: 5px;
            text-decoration: underline;
        }

        footer {
            background-color: #2B5F7F;
            color: #ffffff;
            text-align: center;
            padding: 25px 20px;
            margin-top: 0;
        }

        footer p {
            margin: 0;
            font-size: 0.95rem;
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 2rem;
                padding: 20px 15px;
            }

            nav ul {
                flex-direction: column;
            }

            nav ul li {
                width: 100%;
                text-align: center;
                border-bottom: 1px solid #e0e0e0;
            }

            nav ul li:last-child {
                border-bottom: none;
            }

            nav ul li a {
                padding: 12px 15px;
            }

            main {
                margin: 20px 15px;
                border-radius: 8px;
            }

            article {
                padding: 25px 20px;
            }

            article h2 {
                font-size: 1.5rem;
            }

            article h3 {
                font-size: 1.3rem;
            }

            .transition-section {
                padding: 20px;
            }

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

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

            .links-section h3 {
                font-size: 1.4rem;
            }
        }

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

            article h2 {
                font-size: 1.3rem;
            }

            article h3 {
                font-size: 1.15rem;
            }

            article p,
            .transition-section p {
                font-size: 0.95rem;
            }
        }