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

        body {
            font-family: 'Segoe UI', Arial, Helvetica, sans-serif;
            font-size: 14px;
            color: #333;
            line-height: 1.6;
            background: #f5f5f5;
        }

        .wrapper {
            max-width: 1200px;
            margin: 0 auto;
            background: #fff;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        }

        header {
            background: linear-gradient(to bottom, #e9f8fd 0%, #d4f1fc 100%);
            border-bottom: 3px solid #ffd800;
            padding: 20px 40px;
        }

        .logo {
            font-size: 28px;
            font-weight: bold;
            color: #0066b3;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        nav {
            background: #ffd800;
            padding: 0;
            border-bottom: 2px solid #e0c000;
        }

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

        nav ul li {
            margin: 0;
        }

        nav ul li a {
            display: block;
            padding: 12px 25px;
            color: #000;
            text-decoration: none;
            font-weight: bold;
            font-size: 13px;
            text-transform: uppercase;
            transition: background 0.3s;
        }

        nav ul li a:hover {
            background: rgba(255, 255, 255, 0.3);
        }

        main {
            padding: 40px;
        }

        h1 {
            font-size: 32px;
            color: #338baf;
            margin-bottom: 30px;
            padding-bottom: 15px;
            border-bottom: 3px solid #beecfb;
            text-transform: uppercase;
            font-weight: normal;
        }

        article {
            margin-bottom: 40px;
            color: #2b414b;
        }

        article h2 {
            font-size: 24px;
            color: #414142;
            margin: 25px 0 15px;
            font-weight: normal;
        }

        article h3 {
            font-size: 18px;
            color: #338baf;
            margin: 20px 0 12px;
            font-weight: normal;
        }

        article h4 {
            font-size: 16px;
            color: #3f6477;
            margin: 15px 0 10px;
            font-weight: bold;
        }

        article p {
            margin-bottom: 15px;
            line-height: 1.7;
        }

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

        article ul li, article ol li {
            margin-bottom: 8px;
        }

        .transition-section {
            background: #e9f8fd;
            padding: 25px;
            margin: 30px 0;
            border-radius: 5px;
            border-left: 4px solid #0066b3;
        }

        .links-section {
            background: #f9fcfd;
            padding: 30px;
            margin-top: 40px;
            border-radius: 8px;
            border: 1px solid #beecfb;
        }

        .links-section h3 {
            font-size: 18px;
            color: #338baf;
            margin: 25px 0 15px;
            padding-bottom: 8px;
            border-bottom: 2px solid #beecfb;
            background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs+9AAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAADhJREFUeNpiYGBgKABigf///zOQCpiASjYwMjLuR5YnxU6YIiqYiU0hToXYFOJUiE0hVoXYFAIEGACdOhAU/ETSfAAAAABJRU5ErkJggg==) no-repeat left 8px;
            padding-left: 18px;
        }

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

        .links-section ul {
            list-style: none;
            margin: 0;
            padding: 0;
            column-count: 2;
            column-gap: 30px;
        }

        .links-section ul li {
            margin: 0 0 10px 0;
            padding: 0 0 0 15px;
            background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAMCAYAAABfnvydAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAFhJREFUeNpi/P//PwMRgImBCDAyMu5HFoMpQFZAjJ3IcugKyFGAUxFMATkK0BVhKCBHAbYiuAJyFGArwitAV4BTAT4F/1EUEFRAUAFBBf8RCggqwKkAIMAA9RcwFPG0pGkAAAAASUVORK5CYII=) no-repeat left 5px;
            break-inside: avoid;
            page-break-inside: avoid;
        }

        .links-section ul li a {
            color: #0066b3;
            text-decoration: none;
            transition: color 0.3s;
        }

        .links-section ul li a:hover {
            color: #338baf;
            text-decoration: underline;
        }

        footer {
            background: linear-gradient(to bottom, #76c7ed 0%, #5ab5e0 100%);
            color: #fff;
            padding: 30px 40px;
            margin-top: 50px;
            text-align: center;
            font-size: 12px;
        }

        footer a {
            color: #fff;
            text-decoration: underline;
        }

        footer a:hover {
            text-decoration: none;
        }

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

            .logo {
                font-size: 22px;
            }

            nav ul {
                flex-direction: column;
            }

            nav ul li a {
                padding: 10px 20px;
                border-bottom: 1px solid rgba(0, 0, 0, 0.1);
            }

            main {
                padding: 20px;
            }

            h1 {
                font-size: 24px;
            }

            article h2 {
                font-size: 20px;
            }

            article h3 {
                font-size: 16px;
            }

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

            .transition-section {
                padding: 15px;
            }

            .links-section {
                padding: 20px;
            }

            footer {
                padding: 20px;
            }
        }

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

            article h2 {
                font-size: 18px;
            }

            .logo {
                font-size: 18px;
            }
        }