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

        html, body {
            height: 100%;
            font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
            font-size: 16px;
            color: #000;
            line-height: 1.6;
        }

        body {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            background-attachment: fixed;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        #wrapper {
            width: 100%;
            max-width: 960px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.98);
            box-shadow: 0 0 40px rgba(0, 0, 0, 0.3);
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        header {
            background: linear-gradient(to bottom, #2c3e50, #34495e);
            padding: 30px 40px 20px;
            text-align: center;
        }

        header h1 {
            font-size: 32px;
            font-weight: bold;
            color: #fff;
            margin-bottom: 15px;
            text-transform: uppercase;
            letter-spacing: 2px;
        }

        nav {
            background: #34495e;
            border-top: 3px solid #667eea;
        }

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

        nav ul li {
            list-style: none;
            margin: 0;
        }

        nav ul li a {
            display: block;
            padding: 15px 25px;
            color: #ecf0f1;
            text-decoration: none;
            font-weight: 600;
            text-transform: uppercase;
            font-size: 14px;
            letter-spacing: 1px;
            border-right: 1px solid rgba(255, 255, 255, 0.1);
            transition: all 0.3s ease;
        }

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

        nav ul li a:hover {
            background: #667eea;
            color: #fff;
        }

        nav ul li.current a {
            background: #667eea;
            color: #fff;
        }

        main {
            flex: 1;
            padding: 40px;
        }

        h1 {
            font-size: 28px;
            font-weight: bold;
            margin-bottom: 25px;
            color: #2c3e50;
            border-bottom: 3px solid #667eea;
            padding-bottom: 10px;
        }

        h2 {
            font-size: 24px;
            font-weight: bold;
            margin: 30px 0 20px;
            color: #34495e;
        }

        h3 {
            font-size: 20px;
            font-weight: 600;
            margin: 25px 0 15px;
            color: #2c3e50;
        }

        h4 {
            font-size: 18px;
            font-weight: 600;
            margin: 20px 0 12px;
            color: #34495e;
        }

        h5, h6 {
            font-size: 16px;
            font-weight: 600;
            margin: 15px 0 10px;
            color: #34495e;
        }

        article p,
        .transition-content p {
            margin-bottom: 15px;
            color: #333;
            font-weight: 300;
            line-height: 1.8;
        }

        article ul,
        article ol {
            margin: 15px 0 15px 30px;
        }

        article ul li,
        article ol li {
            margin-bottom: 8px;
            list-style: disc;
            color: #333;
            font-weight: 300;
        }

        article ol li {
            list-style: decimal;
        }

        article a {
            color: #667eea;
            text-decoration: none;
            border-bottom: 1px solid transparent;
            transition: border-color 0.3s ease;
        }

        article a:hover {
            border-bottom-color: #667eea;
        }

        article strong {
            font-weight: 600;
            color: #2c3e50;
        }

        article em {
            font-style: italic;
        }

        .transition-content {
            margin: 40px 0;
            padding: 25px;
            background: #f8f9fa;
            border-left: 4px solid #667eea;
            border-radius: 4px;
        }

        .transition-content p {
            margin-bottom: 12px;
        }

        .transition-content p:last-child {
            margin-bottom: 0;
        }

        .links-section {
            margin-top: 50px;
            padding: 40px;
            background: #f8f9fa;
            border-radius: 8px;
            border: 1px solid #e1e8ed;
        }

        .links-section h3 {
            font-size: 22px;
            color: #2c3e50;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #667eea;
        }

        .links-section ul {
            list-style: none;
            margin: 0 0 35px 0;
            padding: 0;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 12px 25px;
        }

        .links-section ul li {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .links-section ul li a {
            color: #667eea;
            text-decoration: none;
            font-weight: 400;
            display: inline-block;
            position: relative;
            padding-left: 18px;
            transition: all 0.3s ease;
        }

        .links-section ul li a:before {
            content: "›";
            position: absolute;
            left: 0;
            font-weight: bold;
            font-size: 20px;
            line-height: 1.4;
        }

        .links-section ul li a:hover {
            color: #764ba2;
            padding-left: 22px;
        }

        footer {
            background: #2c3e50;
            color: #9d9d9d;
            padding: 25px 40px;
            text-align: center;
            border-top: 3px solid #667eea;
        }

        footer p {
            margin: 0;
            font-size: 14px;
            color: #9d9d9d;
        }

        footer a {
            color: #667eea;
            text-decoration: none;
        }

        footer a:hover {
            color: #764ba2;
        }

        @media (max-width: 768px) {
            header {
                padding: 20px 20px 15px;
            }

            header h1 {
                font-size: 24px;
                letter-spacing: 1px;
            }

            nav ul {
                flex-direction: column;
            }

            nav ul li {
                width: 100%;
            }

            nav ul li a {
                border-right: none;
                border-bottom: 1px solid rgba(255, 255, 255, 0.1);
                padding: 12px 20px;
            }

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

            main {
                padding: 25px 20px;
            }

            h1 {
                font-size: 24px;
                margin-bottom: 20px;
            }

            h2 {
                font-size: 20px;
            }

            h3 {
                font-size: 18px;
            }

            .transition-content {
                padding: 20px;
                margin: 30px 0;
            }

            .links-section {
                padding: 25px 20px;
                margin-top: 35px;
            }

            .links-section ul {
                grid-template-columns: 1fr;
                gap: 10px;
            }

            .links-section h3 {
                font-size: 20px;
                margin-bottom: 15px;
            }

            footer {
                padding: 20px;
            }
        }

        @media (max-width: 480px) {
            header h1 {
                font-size: 20px;
            }

            nav ul li a {
                font-size: 13px;
                padding: 10px 15px;
            }

            main {
                padding: 20px 15px;
            }

            h1 {
                font-size: 22px;
            }

            h2 {
                font-size: 18px;
            }

            .links-section {
                padding: 20px 15px;
            }
        }