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

        body {
            font-family: Arial, Helvetica, sans-serif;
            font-size: 16px;
            line-height: 1.6;
            color: #333;
            background: #f5f5f5;
        }

        header {
            background: linear-gradient(to bottom, #1d8ec2 0%, #189cd3 100%);
            padding: 20px 0;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }

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

        .logo {
            font-size: 24px;
            font-weight: bold;
            color: #fff;
            text-decoration: none;
            display: inline-block;
        }

        nav {
            background: #45565e;
            padding: 15px 0;
            box-shadow: 0 2px 3px rgba(0,0,0,0.1);
        }

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

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

        nav a {
            color: #eeffdf;
            text-decoration: none;
            font-size: 14px;
            transition: color 0.3s;
        }

        nav a:hover {
            color: #8add42;
        }

        main {
            max-width: 1200px;
            margin: 40px auto;
            padding: 0 20px;
            display: grid;
            grid-template-columns: 1fr;
            gap: 40px;
        }

        .content-wrapper {
            background: #fff;
            padding: 40px;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }

        h1 {
            font-size: 32px;
            line-height: 1.3;
            color: #333;
            margin-bottom: 30px;
            padding-bottom: 15px;
            border-bottom: 3px solid #7ac142;
        }

        article h2 {
            font-size: 24px;
            color: #219bd2;
            margin: 30px 0 15px;
        }

        article h3 {
            font-size: 20px;
            color: #219bd2;
            margin: 25px 0 12px;
        }

        article h4 {
            font-size: 18px;
            color: #7ac142;
            margin: 20px 0 10px;
        }

        article p {
            margin: 15px 0;
            font-size: 16px;
            line-height: 1.7;
            color: #333;
        }

        article ul, article ol {
            margin: 15px 0 15px 25px;
            line-height: 1.8;
        }

        article li {
            margin: 8px 0;
        }

        article a {
            color: #1B8EC1;
            text-decoration: none;
            transition: color 0.3s;
        }

        article a:hover {
            color: #f79614;
        }

        article blockquote {
            margin: 20px 0;
            padding: 15px 20px;
            background: #f0f8ff;
            border-left: 4px solid #219bd2;
            font-style: italic;
        }

        article table {
            width: 100%;
            margin: 20px 0;
            border-collapse: collapse;
            font-size: 14px;
        }

        article th {
            background: #229bd1;
            color: #fff;
            padding: 12px;
            text-align: left;
        }

        article td {
            padding: 12px;
            border: 1px solid #e2e2e2;
        }

        article tr:nth-child(even) {
            background: #fafafa;
        }

        article tr:hover {
            background: #d5ecf7;
        }

        .transition-section {
            background: #f7f7f7;
            padding: 30px;
            margin: 40px 0;
            border-radius: 8px;
            border-left: 5px solid #f3901d;
        }

        .transition-section p {
            font-size: 16px;
            line-height: 1.7;
            color: #333;
            margin: 10px 0;
        }

        .links-section {
            background: #fff;
            padding: 40px;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
            margin-top: 40px;
        }

        .links-section h2 {
            font-size: 28px;
            color: #7ac142;
            margin-bottom: 30px;
            padding-bottom: 15px;
            border-bottom: 2px solid #e2e2e2;
        }

        .links-section h3 {
            font-size: 20px;
            color: #219bd2;
            margin: 25px 0 15px;
        }

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

        .links-section li {
            padding: 8px 0;
            border-bottom: 1px solid #f0f0f0;
        }

        .links-section a {
            color: #1B8EC1;
            text-decoration: none;
            font-size: 15px;
            display: inline-block;
            padding-left: 20px;
            position: relative;
            transition: all 0.3s;
        }

        .links-section a:before {
            content: "→";
            position: absolute;
            left: 0;
            color: #7ac142;
            transition: left 0.3s;
        }

        .links-section a:hover {
            color: #f79614;
            padding-left: 25px;
        }

        .links-section a:hover:before {
            left: 5px;
        }

        footer {
            background: #189cd3;
            color: #fff;
            padding: 40px 0 20px;
            margin-top: 60px;
        }

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

        .footer-bottom {
            text-align: center;
            margin-top: 30px;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.2);
            font-size: 14px;
        }

        @media (max-width: 768px) {
            .content-wrapper {
                padding: 25px 20px;
            }

            h1 {
                font-size: 26px;
            }

            article h2 {
                font-size: 22px;
            }

            article h3 {
                font-size: 18px;
            }

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

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

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

            .transition-section {
                padding: 20px;
            }
        }

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

            article h2 {
                font-size: 20px;
            }

            .content-wrapper {
                padding: 20px 15px;
            }

            main {
                margin: 20px auto;
            }
        }