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

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

        header {
            background-color: #fff;
            border-bottom: 3px solid #e8e8e8;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }

        .header-container {
            max-width: 960px;
            margin: 0 auto;
            padding: 20px 20px;
        }

        .site-title {
            font-size: 2em;
            font-weight: normal;
            color: #333;
            margin: 0;
        }

        .site-title a {
            color: #333;
            text-decoration: none;
        }

        .site-title a:hover {
            color: #555;
        }

        nav {
            background-color: #4a4a4a;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }

        .nav-container {
            max-width: 960px;
            margin: 0 auto;
            padding: 0;
        }

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

        nav ul li {
            flex: 1 1 auto;
        }

        nav ul li a {
            display: block;
            padding: 15px 20px;
            color: #fff;
            text-decoration: none;
            transition: background-color 0.3s;
            border-right: 1px solid #5a5a5a;
        }

        nav ul li:last-child a {
            border-right: none;
        }

        nav ul li a:hover,
        nav ul li a.current {
            background-color: #333;
        }

        main {
            max-width: 960px;
            margin: 30px auto;
            padding: 0 20px;
        }

        .content-wrapper {
            background-color: #fff;
            padding: 40px;
            border-radius: 4px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.08);
            margin-bottom: 30px;
        }

        h1 {
            font-size: 2.2em;
            color: #333;
            margin-bottom: 30px;
            padding-bottom: 15px;
            border-bottom: 2px solid #e8e8e8;
        }

        article h2 {
            font-size: 1.8em;
            color: #333;
            margin-top: 30px;
            margin-bottom: 15px;
        }

        article h3 {
            font-size: 1.4em;
            color: #444;
            margin-top: 25px;
            margin-bottom: 12px;
        }

        article h4 {
            font-size: 1.2em;
            color: #555;
            margin-top: 20px;
            margin-bottom: 10px;
        }

        article p {
            margin-bottom: 15px;
            font-size: 1em;
            line-height: 1.8;
            color: #555;
        }

        .transition-section {
            background-color: #fff;
            padding: 30px 40px;
            border-radius: 4px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.08);
            margin-bottom: 30px;
        }

        .transition-section p {
            font-size: 1em;
            line-height: 1.8;
            color: #555;
            margin-bottom: 15px;
        }

        .links-section {
            background-color: #fff;
            padding: 40px;
            border-radius: 4px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.08);
            margin-bottom: 30px;
        }

        .links-section h2 {
            font-size: 1.8em;
            color: #333;
            margin-bottom: 25px;
            padding-bottom: 10px;
            border-bottom: 2px solid #e8e8e8;
        }

        .links-section h3 {
            font-size: 1.3em;
            color: #444;
            margin-top: 25px;
            margin-bottom: 15px;
        }

        .links-section ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 10px 30px;
            margin-bottom: 25px;
        }

        .links-section ul li {
            padding: 8px 0;
        }

        .links-section ul li a {
            color: #0066cc;
            text-decoration: none;
            transition: color 0.3s;
            font-size: 0.95em;
        }

        .links-section ul li a:hover {
            color: #004499;
            text-decoration: underline;
        }

        footer {
            background-color: #4a4a4a;
            color: #fff;
            padding: 25px 20px;
            margin-top: 50px;
        }

        .footer-container {
            max-width: 960px;
            margin: 0 auto;
            text-align: center;
            font-size: 0.9em;
        }

        .footer-container p {
            margin: 5px 0;
        }

        .footer-container a {
            color: #fff;
            text-decoration: underline;
        }

        .footer-container a:hover {
            color: #ddd;
        }

        @media (max-width: 768px) {
            .header-container {
                padding: 15px 15px;
            }

            .site-title {
                font-size: 1.5em;
            }

            nav ul {
                flex-direction: column;
            }

            nav ul li {
                flex: 1 1 100%;
            }

            nav ul li a {
                border-right: none;
                border-bottom: 1px solid #5a5a5a;
            }

            nav ul li:last-child a {
                border-bottom: none;
            }

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

            h1 {
                font-size: 1.8em;
            }

            article h2 {
                font-size: 1.5em;
            }

            article h3 {
                font-size: 1.3em;
            }

            .links-section ul {
                grid-template-columns: 1fr;
                gap: 8px;
            }
        }

        @media (max-width: 480px) {
            .site-title {
                font-size: 1.3em;
            }

            nav ul li a {
                padding: 12px 15px;
                font-size: 0.95em;
            }

            h1 {
                font-size: 1.5em;
            }

            .content-wrapper,
            .transition-section,
            .links-section {
                padding: 20px 15px;
            }
        }