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

        body {
            font-family: 'Open Sans', Arial, sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: #666;
            background-color: #f5f5f5;
            font-weight: 400;
        }

        header {
            background-color: #fff;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .header-container {
            max-width: 1080px;
            margin: 0 auto;
            padding: 20px 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 24px;
            font-weight: 700;
            color: #333;
            text-decoration: none;
        }

        nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }

        nav a {
            color: #666;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
        }

        nav a:hover {
            color: #2ea3f2;
        }

        .container {
            max-width: 1080px;
            margin: 0 auto;
            padding: 60px 30px;
        }

        h1 {
            font-size: 42px;
            color: #333;
            margin-bottom: 30px;
            font-weight: 600;
            line-height: 1.3;
        }

        article {
            background-color: #fff;
            padding: 50px;
            border-radius: 8px;
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
            margin-bottom: 40px;
        }

        article h2 {
            font-size: 32px;
            color: #333;
            margin: 40px 0 20px 0;
            font-weight: 600;
        }

        article h2:first-child {
            margin-top: 0;
        }

        article h3 {
            font-size: 26px;
            color: #333;
            margin: 30px 0 15px 0;
            font-weight: 600;
        }

        article h4 {
            font-size: 22px;
            color: #333;
            margin: 25px 0 12px 0;
            font-weight: 600;
        }

        article h5 {
            font-size: 18px;
            color: #333;
            margin: 20px 0 10px 0;
            font-weight: 600;
        }

        article h6 {
            font-size: 16px;
            color: #333;
            margin: 18px 0 8px 0;
            font-weight: 600;
        }

        article p {
            margin-bottom: 20px;
            color: #666;
        }

        article p:last-child {
            margin-bottom: 0;
        }

        article ul, article ol {
            margin: 20px 0;
            padding-left: 30px;
        }

        article li {
            margin-bottom: 10px;
            color: #666;
        }

        article a {
            color: #2ea3f2;
            text-decoration: none;
            transition: color 0.3s;
        }

        article a:hover {
            color: #1a8fd9;
        }

        article strong {
            font-weight: 700;
            color: #333;
        }

        article em {
            font-style: italic;
        }

        article blockquote {
            margin: 25px 0;
            padding-left: 25px;
            border-left: 5px solid #2ea3f2;
            font-style: italic;
            color: #555;
        }

        .transition-section {
            background-color: #fff;
            padding: 40px 50px;
            border-radius: 8px;
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
            margin-bottom: 40px;
        }

        .transition-section p {
            margin-bottom: 15px;
            color: #666;
        }

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

        .links-section {
            background-color: #fff;
            padding: 50px;
            border-radius: 8px;
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
        }

        .links-section > h2 {
            font-size: 32px;
            color: #333;
            margin-bottom: 30px;
            font-weight: 600;
        }

        .links-section > h3 {
            font-size: 26px;
            color: #333;
            margin: 35px 0 20px 0;
            font-weight: 600;
        }

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

        .links-section ul {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 15px 30px;
            list-style: none;
            margin-bottom: 30px;
        }

        .links-section li {
            position: relative;
            padding-left: 20px;
        }

        .links-section li:before {
            content: "→";
            position: absolute;
            left: 0;
            color: #2ea3f2;
            font-weight: 700;
        }

        .links-section a {
            color: #2ea3f2;
            text-decoration: none;
            transition: color 0.3s;
            display: inline-block;
        }

        .links-section a:hover {
            color: #1a8fd9;
            text-decoration: underline;
        }

        footer {
            background-color: #2c3e50;
            color: #ecf0f1;
            padding: 40px 30px;
            margin-top: 60px;
        }

        .footer-container {
            max-width: 1080px;
            margin: 0 auto;
            text-align: center;
        }

        .footer-container p {
            margin-bottom: 10px;
        }

        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                gap: 20px;
            }

            nav ul {
                flex-direction: column;
                gap: 15px;
                text-align: center;
            }

            h1 {
                font-size: 32px;
            }

            article, .transition-section, .links-section {
                padding: 30px 25px;
            }

            article h2 {
                font-size: 26px;
            }

            article h3 {
                font-size: 22px;
            }

            .links-section > h2 {
                font-size: 26px;
            }

            .links-section > h3 {
                font-size: 22px;
            }

            .links-section ul {
                grid-template-columns: 1fr;
                gap: 12px;
            }

            .container {
                padding: 40px 20px;
            }
        }

        @media (max-width: 480px) {
            h1 {
                font-size: 28px;
            }

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

            article h2 {
                font-size: 24px;
            }

            .links-section > h2 {
                font-size: 24px;
            }
        }