* {
            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;
        }

        header {
            background: linear-gradient(135deg, #1e5a8e 0%, #2d7ab8 100%);
            color: white;
            padding: 1.5rem 0;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }

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

        header h1 {
            font-size: 2rem;
            font-weight: 600;
            letter-spacing: -0.5px;
        }

        nav {
            background-color: #fff;
            border-bottom: 3px solid #2d7ab8;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
            position: sticky;
            top: 0;
            z-index: 100;
        }

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

        nav ul {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 0;
        }

        nav li {
            flex: 1;
            min-width: 150px;
        }

        nav a {
            display: block;
            padding: 1rem 1.2rem;
            color: #1e5a8e;
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
            border-bottom: 3px solid transparent;
            text-align: center;
        }

        nav a:hover {
            background-color: #f0f7fc;
            border-bottom-color: #2d7ab8;
            color: #2d7ab8;
        }

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

        .content-wrapper {
            background: white;
            border-radius: 8px;
            box-shadow: 0 2px 12px rgba(0,0,0,0.08);
            padding: 2.5rem;
            margin-bottom: 2rem;
        }

        h1 {
            color: #1e5a8e;
            font-size: 2.5rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }

        article h2 {
            color: #1e5a8e;
            font-size: 1.8rem;
            margin-top: 2rem;
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e0e0e0;
        }

        article h3 {
            color: #2d7ab8;
            font-size: 1.4rem;
            margin-top: 1.5rem;
            margin-bottom: 0.8rem;
        }

        article h4 {
            color: #333;
            font-size: 1.2rem;
            margin-top: 1.2rem;
            margin-bottom: 0.6rem;
        }

        article p {
            margin-bottom: 1rem;
            color: #444;
            font-size: 1.05rem;
        }

        article ul, article ol {
            margin-left: 2rem;
            margin-bottom: 1rem;
        }

        article li {
            margin-bottom: 0.5rem;
            color: #444;
        }

        .transition-section {
            background: white;
            border-radius: 8px;
            box-shadow: 0 2px 12px rgba(0,0,0,0.08);
            padding: 2rem 2.5rem;
            margin-bottom: 2rem;
        }

        .transition-section p {
            color: #444;
            font-size: 1.05rem;
            margin-bottom: 1rem;
        }

        .links-section {
            background: linear-gradient(to bottom, #ffffff 0%, #f8fbfd 100%);
            border-radius: 8px;
            box-shadow: 0 2px 12px rgba(0,0,0,0.08);
            padding: 2.5rem;
            margin-bottom: 2rem;
        }

        .links-section h2 {
            color: #1e5a8e;
            font-size: 1.8rem;
            margin-bottom: 2rem;
            text-align: center;
        }

        .links-section h3 {
            color: #2d7ab8;
            font-size: 1.3rem;
            margin-top: 1.5rem;
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #2d7ab8;
        }

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

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

        .links-section a {
            color: #1e5a8e;
            text-decoration: none;
            padding: 0.4rem 0;
            display: inline-block;
            transition: all 0.2s ease;
            position: relative;
        }

        .links-section a:before {
            content: "→";
            margin-right: 0.5rem;
            color: #2d7ab8;
            font-weight: bold;
        }

        .links-section a:hover {
            color: #2d7ab8;
            transform: translateX(5px);
        }

        footer {
            background: linear-gradient(135deg, #1e5a8e 0%, #2d7ab8 100%);
            color: white;
            padding: 2rem 0;
            margin-top: 3rem;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            text-align: center;
        }

        .footer-links {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 1rem 2rem;
            margin-bottom: 1rem;
        }

        footer a {
            color: white;
            text-decoration: none;
            transition: opacity 0.3s ease;
        }

        footer a:hover {
            opacity: 0.8;
            text-decoration: underline;
        }

        footer p {
            margin-top: 1rem;
            opacity: 0.9;
            font-size: 0.95rem;
        }

        @media (max-width: 768px) {
            header h1 {
                font-size: 1.5rem;
            }

            h1 {
                font-size: 2rem;
            }

            nav ul {
                flex-direction: column;
            }

            nav li {
                min-width: 100%;
            }

            nav a {
                text-align: left;
                border-bottom: 1px solid #e0e0e0;
            }

            .content-wrapper,
            .transition-section,
            .links-section {
                padding: 1.5rem;
            }

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

            .footer-links {
                flex-direction: column;
                gap: 0.8rem;
            }

            article h2 {
                font-size: 1.5rem;
            }

            article h3 {
                font-size: 1.2rem;
            }
        }

        @media (max-width: 480px) {
            main {
                padding: 10px;
            }

            .content-wrapper,
            .transition-section,
            .links-section {
                padding: 1rem;
            }
        }