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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #fafafa;
        }

        header {
            background-color: #fff;
            border-bottom: 1px solid #e5e5e5;
            padding: 1.5rem 0;
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .header-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .site-title {
            font-size: 1.8rem;
            font-weight: 700;
            color: #2c3e50;
            text-decoration: none;
            letter-spacing: -0.5px;
        }

        .tagline {
            font-size: 0.9rem;
            color: #7f8c8d;
            font-style: italic;
        }

        nav {
            display: flex;
            gap: 2rem;
        }

        nav a {
            text-decoration: none;
            color: #555;
            font-size: 0.95rem;
            transition: color 0.3s;
            font-weight: 500;
        }

        nav a:hover {
            color: #2c3e50;
        }

        .main-content {
            max-width: 900px;
            margin: 0 auto;
            padding: 3rem 20px;
        }

        h1 {
            font-size: 2.5rem;
            color: #2c3e50;
            margin-bottom: 2rem;
            text-align: center;
            font-weight: 700;
            line-height: 1.2;
        }

        article {
            background: #fff;
            padding: 3rem;
            margin-bottom: 3rem;
            border-radius: 4px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.08);
        }

        article h2 {
            font-size: 1.8rem;
            color: #2c3e50;
            margin: 2rem 0 1rem;
            font-weight: 600;
        }

        article h3 {
            font-size: 1.4rem;
            color: #34495e;
            margin: 1.5rem 0 0.8rem;
            font-weight: 600;
        }

        article p {
            margin-bottom: 1.2rem;
            font-size: 1.05rem;
            color: #555;
        }

        .transition-section {
            background: #f8f9fa;
            padding: 2.5rem 3rem;
            margin-bottom: 3rem;
            border-radius: 4px;
            border-left: 4px solid #95a5a6;
        }

        .transition-section p {
            font-size: 1.05rem;
            color: #555;
            margin-bottom: 1rem;
        }

        .links-section {
            background: #fff;
            padding: 3rem;
            border-radius: 4px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.08);
            margin-bottom: 3rem;
        }

        .links-section h3 {
            font-size: 1.5rem;
            color: #2c3e50;
            margin-bottom: 1.5rem;
            font-weight: 600;
        }

        .links-section ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 0.8rem 2rem;
        }

        .links-section li {
            margin-bottom: 0.5rem;
        }

        .links-section a {
            color: #3498db;
            text-decoration: none;
            font-size: 1rem;
            transition: color 0.3s;
            display: inline-block;
        }

        .links-section a:hover {
            color: #2c3e50;
            text-decoration: underline;
        }

        footer {
            background-color: #2c3e50;
            color: #ecf0f1;
            padding: 2.5rem 0;
            margin-top: 4rem;
        }

        .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            text-align: center;
        }

        .footer-inner p {
            font-size: 0.9rem;
            margin-bottom: 0.5rem;
        }

        @media (max-width: 768px) {
            .header-inner {
                flex-direction: column;
                gap: 1rem;
            }

            nav {
                flex-wrap: wrap;
                gap: 1rem;
                justify-content: center;
            }

            h1 {
                font-size: 2rem;
            }

            article {
                padding: 2rem 1.5rem;
            }

            article h2 {
                font-size: 1.5rem;
            }

            article h3 {
                font-size: 1.2rem;
            }

            .transition-section {
                padding: 2rem 1.5rem;
            }

            .links-section {
                padding: 2rem 1.5rem;
            }

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

            .main-content {
                padding: 2rem 15px;
            }
        }

        @media (max-width: 480px) {
            .site-title {
                font-size: 1.5rem;
            }

            h1 {
                font-size: 1.6rem;
            }

            nav a {
                font-size: 0.85rem;
            }
        }