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

        body {
            font-family: "Open Sans", helvetica, arial, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f5f5f5;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        header {
            background-color: #fff;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

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

        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }

        .logo {
            font-size: 24px;
            font-weight: 700;
            color: #4794bb;
            text-decoration: none;
        }

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

        .nav-menu a {
            text-decoration: none;
            color: #444;
            font-size: 14px;
            transition: color 0.3s;
        }

        .nav-menu a:hover {
            color: #4794bb;
        }

        main {
            background-color: #fff;
            margin: 30px auto;
            max-width: 1200px;
            padding: 50px 20px;
            box-shadow: 0 0 20px rgba(0,0,0,0.05);
        }

        h1 {
            font-size: 42px;
            color: #333;
            margin-bottom: 30px;
            text-align: center;
            line-height: 1.2;
            font-weight: 600;
        }

        article {
            max-width: 900px;
            margin: 0 auto 50px;
        }

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

        article h3 {
            font-size: 24px;
            color: #4794bb;
            margin: 30px 0 15px;
            font-weight: 600;
        }

        article h4 {
            font-size: 20px;
            color: #444;
            margin: 25px 0 12px;
            font-weight: 600;
        }

        article h5 {
            font-size: 18px;
            color: #555;
            margin: 20px 0 10px;
            font-weight: 600;
        }

        article p {
            font-size: 16px;
            line-height: 1.8;
            color: #666;
            margin-bottom: 20px;
        }

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

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

        .transition-section {
            max-width: 900px;
            margin: 50px auto;
            padding: 40px;
            background: linear-gradient(135deg, #f0f8ff 0%, #e6f3ff 100%);
            border-left: 5px solid #4794bb;
            border-radius: 5px;
        }

        .transition-section p {
            font-size: 16px;
            line-height: 1.8;
            color: #555;
            margin-bottom: 15px;
        }

        .links-section {
            max-width: 1100px;
            margin: 60px auto;
            padding: 50px 40px;
            background-color: #fafafa;
            border-radius: 8px;
            border: 1px solid #e0e0e0;
        }

        .links-section h3 {
            font-size: 26px;
            color: #333;
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 3px solid #4794bb;
            font-weight: 600;
        }

        .links-section ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 15px 30px;
            margin-bottom: 40px;
        }

        .links-section ul:last-child {
            margin-bottom: 0;
        }

        .links-section li {
            padding: 0;
        }

        .links-section a {
            color: #4794bb;
            text-decoration: none;
            font-size: 15px;
            display: inline-block;
            transition: all 0.3s;
            position: relative;
            padding-left: 20px;
        }

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

        .links-section a:hover {
            color: #3a579a;
            padding-left: 25px;
        }

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

        footer {
            background-color: #2c3e50;
            color: #ecf0f1;
            padding: 30px 0;
            margin-top: 60px;
        }

        footer .container {
            text-align: center;
        }

        footer p {
            font-size: 14px;
            color: #bdc3c7;
        }

        @media (max-width: 768px) {
            .nav-menu {
                flex-direction: column;
                gap: 15px;
                align-items: center;
            }

            nav {
                flex-direction: column;
                gap: 20px;
            }

            h1 {
                font-size: 32px;
            }

            article h2 {
                font-size: 26px;
            }

            article h3 {
                font-size: 20px;
            }

            main {
                margin: 20px;
                padding: 30px 15px;
            }

            .transition-section {
                padding: 25px;
            }

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

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

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

        @media (max-width: 480px) {
            h1 {
                font-size: 26px;
            }

            article h2 {
                font-size: 22px;
            }

            .logo {
                font-size: 20px;
            }

            .nav-menu a {
                font-size: 13px;
            }
        }