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

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

        .container {
            max-width: 1200px;
            margin: 0 auto;
            background-color: #FFFFFF;
            box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
        }

        header {
            background-color: #FFFFFF;
            padding: 15px 30px 10px;
            border-bottom: 1px solid #EEEEEE;
        }

        .header-links {
            font-size: 13px;
            color: #999;
            margin-bottom: 10px;
        }

        .header-links a {
            color: #999;
            text-decoration: none;
            margin-right: 10px;
        }

        .header-links a:hover {
            color: #666;
        }

        nav {
            background-color: #FFFFFF;
            padding: 15px 30px;
            border-bottom: 2px solid #D6DDE4;
        }

        nav ul {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            align-items: center;
        }

        nav ul li {
            display: inline;
        }

        nav ul li a {
            color: #666;
            text-decoration: none;
            font-size: 14px;
            padding: 5px 10px;
            transition: color 0.3s;
        }

        nav ul li a:hover {
            color: #000;
        }

        .hero-section {
            background: linear-gradient(135deg, #D6DDE4 0%, #B5C1CF 100%);
            padding: 40px 30px;
            border-bottom: 3px solid #EEEEEE;
        }

        .hero-content {
            display: flex;
            flex-wrap: wrap;
            gap: 30px;
            align-items: center;
        }

        .hero-text {
            flex: 1;
            min-width: 280px;
            color: #333;
        }

        .hero-text h6 {
            font-size: 14px;
            margin-bottom: 5px;
            font-weight: normal;
        }

        .hero-text em {
            font-size: 13px;
            color: #666;
        }

        main {
            display: flex;
            flex-wrap: wrap;
        }

        .main-content {
            flex: 2;
            min-width: 300px;
            padding: 30px;
            background-color: #FFFFFF;
        }

        .sidebar {
            flex: 1;
            min-width: 250px;
            background-color: #D6DDE4;
        }

        h1 {
            font-size: 32px;
            color: #333;
            margin-bottom: 25px;
            line-height: 1.3;
        }

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

        article h3 {
            font-size: 20px;
            color: #333;
            margin-top: 20px;
            margin-bottom: 12px;
        }

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

        article p {
            margin-bottom: 15px;
            color: #444;
            line-height: 1.7;
        }

        .transition-section {
            padding: 25px 30px;
            background-color: #F9F9F9;
            border-top: 1px solid #EEEEEE;
            border-bottom: 1px solid #EEEEEE;
        }

        .transition-section p {
            color: #555;
            line-height: 1.7;
            margin-bottom: 15px;
        }

        .sidebar-menu {
            list-style: none;
        }

        .sidebar-menu li {
            border-top: 1px solid #EEEEEE;
        }

        .sidebar-menu li a {
            display: block;
            padding: 12px 15px;
            text-decoration: none;
            color: #333;
            background-color: #D6DDE4;
            border-left: 4px solid transparent;
            transition: all 0.3s;
        }

        .sidebar-menu li:nth-child(1) a { border-left-color: #F3CE33; }
        .sidebar-menu li:nth-child(2) a { border-left-color: #ec519e; }
        .sidebar-menu li:nth-child(3) a { border-left-color: #72c266; }
        .sidebar-menu li:nth-child(4) a { border-left-color: #781d7d; }
        .sidebar-menu li:nth-child(5) a { border-left-color: #4c85c4; }
        .sidebar-menu li:nth-child(6) a { border-left-color: #00af9f; }
        .sidebar-menu li:nth-child(7) a { border-left-color: #9398cd; }
        .sidebar-menu li:nth-child(8) a { border-left-color: #b8b30a; }
        .sidebar-menu li:nth-child(9) a { border-left-color: #5f3844; }
        .sidebar-menu li:nth-child(10) a { border-left-color: #f05033; }
        .sidebar-menu li:nth-child(11) a { border-left-color: #231f20; }

        .sidebar-menu li a:hover {
            background-color: #C5D0DA;
            padding-left: 20px;
        }

        .links-section {
            padding: 40px 30px;
            background-color: #FFFFFF;
        }

        .links-section h3 {
            font-size: 22px;
            color: #333;
            margin-bottom: 20px;
            margin-top: 30px;
            padding-bottom: 10px;
            border-bottom: 2px solid #D6DDE4;
        }

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

        .links-section ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 15px 30px;
            margin-bottom: 30px;
        }

        .links-section ul li {
            padding-left: 0;
        }

        .links-section ul li a {
            color: #4c85c4;
            text-decoration: none;
            line-height: 1.6;
            display: inline-block;
            transition: color 0.3s;
        }

        .links-section ul li a:hover {
            color: #781d7d;
            text-decoration: underline;
        }

        footer {
            background-color: #D6DDE4;
            padding: 25px 30px;
            text-align: left;
            color: #666;
            font-size: 13px;
            border-top: 2px solid #EEEEEE;
        }

        @media (max-width: 768px) {
            .container {
                box-shadow: none;
            }

            header {
                padding: 15px 20px;
            }

            nav {
                padding: 15px 20px;
            }

            nav ul {
                flex-direction: column;
                align-items: flex-start;
                gap: 10px;
            }

            .hero-section {
                padding: 30px 20px;
            }

            .main-content {
                padding: 20px;
            }

            h1 {
                font-size: 26px;
            }

            .transition-section {
                padding: 20px;
            }

            .links-section {
                padding: 30px 20px;
            }

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

            footer {
                padding: 20px;
            }
        }

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

            article h2 {
                font-size: 20px;
            }

            article h3 {
                font-size: 18px;
            }

            .links-section h3 {
                font-size: 19px;
            }
        }