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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f5f5f5;
        }

        .header-top {
            background-color: #222;
            padding: 10px 0;
        }

        .header-top-container {
            max-width: 1140px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: flex-end;
            align-items: center;
        }

        .header-main {
            background-color: #fff;
            border-bottom: 1px solid #e0e0e0;
            padding: 20px 0;
        }

        .header-container {
            max-width: 1140px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 28px;
            font-weight: 700;
            color: #4db2ec;
            text-decoration: none;
        }

        .main-nav {
            background-color: #fff;
            border-bottom: 3px solid #4db2ec;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
        }

        .nav-container {
            max-width: 1140px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .nav-list {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 5px;
        }

        .nav-list li a {
            display: block;
            padding: 18px 20px;
            color: #333;
            text-decoration: none;
            font-size: 15px;
            font-weight: 500;
            transition: all 0.3s ease;
            position: relative;
        }

        .nav-list li a:hover {
            color: #4db2ec;
        }

        .content-wrapper {
            max-width: 1140px;
            margin: 30px auto;
            padding: 0 20px;
            background-color: #fff;
            box-shadow: 0 2px 10px rgba(0,0,0,0.08);
        }

        .article-container {
            padding: 40px;
        }

        h1 {
            font-size: 36px;
            line-height: 1.3;
            color: #111;
            margin-bottom: 30px;
            font-weight: 600;
            padding-bottom: 15px;
            border-bottom: 3px solid #4db2ec;
        }

        article h2 {
            font-size: 28px;
            color: #222;
            margin-top: 35px;
            margin-bottom: 20px;
            font-weight: 600;
        }

        article h3 {
            font-size: 22px;
            color: #333;
            margin-top: 30px;
            margin-bottom: 15px;
            font-weight: 600;
        }

        article h4 {
            font-size: 18px;
            color: #444;
            margin-top: 25px;
            margin-bottom: 12px;
            font-weight: 600;
        }

        article p {
            margin-bottom: 20px;
            font-size: 16px;
            line-height: 1.8;
            color: #555;
        }

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

        article li {
            margin-bottom: 10px;
            line-height: 1.7;
        }

        .transition-section {
            padding: 30px 40px;
            background-color: #f9f9f9;
            border-top: 1px solid #e0e0e0;
        }

        .transition-section p {
            font-size: 16px;
            line-height: 1.8;
            color: #555;
            margin-bottom: 20px;
        }

        .links-section {
            padding: 40px;
            background-color: #fafafa;
            border-top: 2px solid #e0e0e0;
        }

        .links-section h3 {
            font-size: 24px;
            color: #222;
            margin-bottom: 20px;
            font-weight: 600;
            padding-left: 15px;
            border-left: 4px solid #4db2ec;
        }

        .links-section ul {
            list-style: none;
            column-count: 2;
            column-gap: 30px;
            margin-bottom: 35px;
        }

        .links-section li {
            margin-bottom: 12px;
            break-inside: avoid;
        }

        .links-section li a {
            color: #4db2ec;
            text-decoration: none;
            font-size: 15px;
            line-height: 1.6;
            transition: all 0.2s ease;
            display: inline-block;
            position: relative;
            padding-left: 18px;
        }

        .links-section li a:before {
            content: "→";
            position: absolute;
            left: 0;
            color: #4db2ec;
            transition: all 0.2s ease;
        }

        .links-section li a:hover {
            color: #222;
            padding-left: 22px;
        }

        .links-section li a:hover:before {
            left: 4px;
        }

        .footer {
            background-color: #222;
            color: #999;
            padding: 30px 0;
            margin-top: 50px;
        }

        .footer-container {
            max-width: 1140px;
            margin: 0 auto;
            padding: 0 20px;
            text-align: center;
        }

        @media (max-width: 1018px) {
            h1 {
                font-size: 32px;
            }

            article h2 {
                font-size: 24px;
            }

            article h3 {
                font-size: 20px;
            }

            .links-section ul {
                column-count: 2;
            }

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

        @media (max-width: 767px) {
            .nav-list {
                flex-direction: column;
                align-items: stretch;
            }

            .nav-list li a {
                padding: 15px 20px;
                border-bottom: 1px solid #f0f0f0;
            }

            h1 {
                font-size: 28px;
                margin-bottom: 25px;
            }

            article h2 {
                font-size: 22px;
            }

            article h3 {
                font-size: 18px;
            }

            article p {
                font-size: 15px;
            }

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

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

            .header-container {
                flex-direction: column;
                gap: 15px;
            }
        }