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

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

        .header {
            background: #fff;
            border-bottom: 3px solid #0066cc;
            padding: 20px 0;
        }

        .container {
            max-width: 980px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .logo {
            font-size: 28px;
            font-weight: bold;
            color: #0066cc;
            text-decoration: none;
            display: inline-block;
            margin-bottom: 10px;
        }

        .nav {
            background: #0066cc;
            padding: 0;
            margin-top: 15px;
        }

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

        .nav ul li {
            position: relative;
        }

        .nav ul li a {
            display: block;
            padding: 12px 20px;
            color: #fff;
            text-decoration: none;
            transition: background 0.3s;
        }

        .nav ul li a:hover {
            background: #0052a3;
        }

        .main-content {
            background: #fff;
            margin: 30px auto;
            padding: 40px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }

        h1 {
            font-size: 32px;
            color: #0066cc;
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 2px solid #e0e0e0;
        }

        article h2 {
            font-size: 24px;
            color: #333;
            margin-top: 25px;
            margin-bottom: 15px;
        }

        article h3 {
            font-size: 20px;
            color: #0066cc;
            margin-top: 20px;
            margin-bottom: 12px;
        }

        article h4 {
            font-size: 18px;
            color: #333;
            margin-top: 18px;
            margin-bottom: 10px;
        }

        article p {
            margin-bottom: 15px;
            text-align: justify;
        }

        .transition-section {
            background: #f9f9f9;
            padding: 25px;
            margin: 30px 0;
            border-left: 4px solid #0066cc;
        }

        .transition-section p {
            margin-bottom: 10px;
        }

        .links-section {
            background: #fff;
            padding: 30px;
            margin: 30px 0;
            border: 1px solid #e0e0e0;
        }

        .links-section h3 {
            font-size: 22px;
            color: #0066cc;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid #e0e0e0;
        }

        .links-section ul {
            list-style: none;
            column-count: 2;
            column-gap: 30px;
            margin-bottom: 25px;
        }

        .links-section ul li {
            margin-bottom: 10px;
            break-inside: avoid;
        }

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

        .links-section ul li a:hover {
            color: #0052a3;
            text-decoration: underline;
        }

        .links-section ul li a::before {
            content: "→ ";
            margin-right: 5px;
        }

        .footer {
            background: #333;
            color: #fff;
            padding: 30px 0;
            margin-top: 40px;
        }

        .footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
        }

        .footer-column {
            flex: 1;
            min-width: 200px;
            margin-bottom: 20px;
            padding: 0 15px;
        }

        .footer-column h4 {
            color: #0066cc;
            margin-bottom: 15px;
            font-size: 16px;
        }

        .footer-column ul {
            list-style: none;
        }

        .footer-column ul li {
            margin-bottom: 8px;
        }

        .footer-column ul li a {
            color: #ccc;
            text-decoration: none;
            transition: color 0.3s;
        }

        .footer-column ul li a:hover {
            color: #fff;
        }

        .footer-bottom {
            text-align: center;
            padding-top: 20px;
            margin-top: 20px;
            border-top: 1px solid #555;
            color: #ccc;
            font-size: 14px;
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 15px;
            }

            .main-content {
                padding: 20px;
                margin: 15px auto;
            }

            h1 {
                font-size: 26px;
            }

            .nav ul {
                flex-direction: column;
            }

            .nav ul li {
                width: 100%;
            }

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

            .footer-content {
                flex-direction: column;
            }

            .footer-column {
                width: 100%;
            }
        }

        @media (max-width: 480px) {
            h1 {
                font-size: 22px;
            }

            article h2 {
                font-size: 20px;
            }

            article h3 {
                font-size: 18px;
            }

            .logo {
                font-size: 24px;
            }

            .nav ul li a {
                padding: 10px 15px;
            }
        }