* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Open Sans', Arial, sans-serif;
            font-size: 16px;
            line-height: 1.7em;
            color: #666;
            background-color: #fff;
            font-weight: 500;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        
        .site-header {
            background-color: #fff;
            border-bottom: 1px solid #f0f0f0;
            padding: 20px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }
        
        .header-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .site-logo {
            font-size: 24px;
            font-weight: 700;
            color: #333;
            text-decoration: none;
        }
        
        .main-nav ul {
            list-style: none;
            display: flex;
            gap: 30px;
            align-items: center;
        }
        
        .main-nav a {
            color: #666;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
        }
        
        .main-nav a:hover {
            color: #2ea3f2;
        }
        
        .container {
            max-width: 1080px;
            margin: 0 auto;
            padding: 60px 30px;
        }
        
        h1 {
            font-size: 42px;
            color: #333;
            font-weight: 500;
            line-height: 1.3em;
            margin-bottom: 30px;
            padding-bottom: 20px;
            border-bottom: 3px solid #2ea3f2;
        }
        
        article {
            background: #fff;
            margin-bottom: 50px;
        }
        
        article h2 {
            font-size: 32px;
            color: #333;
            font-weight: 500;
            margin-top: 40px;
            margin-bottom: 20px;
            padding-bottom: 10px;
        }
        
        article h3 {
            font-size: 26px;
            color: #333;
            font-weight: 500;
            margin-top: 35px;
            margin-bottom: 18px;
            padding-bottom: 8px;
        }
        
        article h4 {
            font-size: 22px;
            color: #333;
            font-weight: 500;
            margin-top: 30px;
            margin-bottom: 15px;
        }
        
        article h5 {
            font-size: 18px;
            color: #333;
            font-weight: 500;
            margin-top: 25px;
            margin-bottom: 12px;
        }
        
        article h6 {
            font-size: 16px;
            color: #333;
            font-weight: 500;
            margin-top: 20px;
            margin-bottom: 10px;
        }
        
        article p {
            margin-bottom: 1.5em;
            color: #666;
            font-size: 16px;
            line-height: 1.8em;
        }
        
        article a {
            color: #2ea3f2;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        article a:hover {
            color: #1c7fc0;
        }
        
        article ul, article ol {
            margin-bottom: 1.5em;
            padding-left: 30px;
        }
        
        article li {
            margin-bottom: 0.8em;
            color: #666;
        }
        
        article blockquote {
            margin: 30px 0;
            padding-left: 25px;
            border-left: 5px solid #2ea3f2;
            font-style: italic;
            color: #555;
        }
        
        .transition-section {
            background: #f9f9f9;
            padding: 40px;
            margin: 50px 0;
            border-radius: 8px;
            border-left: 4px solid #2ea3f2;
        }
        
        .transition-section p {
            color: #666;
            line-height: 1.8em;
            margin-bottom: 1.2em;
        }
        
        .transition-section p:last-child {
            margin-bottom: 0;
        }
        
        .links-section {
            background: #ffffff;
            padding: 50px 40px;
            margin-top: 50px;
            border: 1px solid #e8e8e8;
            border-radius: 8px;
            box-shadow: 0 2px 15px rgba(0,0,0,0.05);
        }
        
        .links-section h3 {
            font-size: 24px;
            color: #333;
            font-weight: 600;
            margin-bottom: 20px;
            margin-top: 35px;
            padding-bottom: 12px;
            border-bottom: 2px solid #f0f0f0;
        }
        
        .links-section h3:first-child {
            margin-top: 0;
        }
        
        .links-section ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 15px 30px;
            margin-bottom: 35px;
        }
        
        .links-section li {
            padding: 0;
        }
        
        .links-section a {
            color: #2ea3f2;
            text-decoration: none;
            display: inline-block;
            position: relative;
            padding-left: 20px;
            transition: all 0.3s;
        }
        
        .links-section a:before {
            content: "→";
            position: absolute;
            left: 0;
            color: #2ea3f2;
            transition: transform 0.3s;
        }
        
        .links-section a:hover {
            color: #1c7fc0;
            padding-left: 25px;
        }
        
        .links-section a:hover:before {
            transform: translateX(3px);
        }
        
        .site-footer {
            background: #2ea3f2;
            color: #fff;
            padding: 40px 0;
            margin-top: 80px;
        }
        
        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 30px;
            text-align: center;
        }
        
        .footer-container p {
            margin: 0;
            font-size: 14px;
            opacity: 0.9;
        }
        
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                gap: 20px;
            }
            
            .main-nav ul {
                flex-direction: column;
                gap: 15px;
                text-align: center;
            }
            
            .container {
                padding: 40px 20px;
            }
            
            h1 {
                font-size: 32px;
            }
            
            article h2 {
                font-size: 26px;
            }
            
            article h3 {
                font-size: 22px;
            }
            
            article h4 {
                font-size: 20px;
            }
            
            .transition-section {
                padding: 25px 20px;
            }
            
            .links-section {
                padding: 30px 20px;
            }
            
            .links-section ul {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            
            .links-section h3 {
                font-size: 20px;
            }
        }
        
        @media (max-width: 480px) {
            h1 {
                font-size: 28px;
            }
            
            article h2 {
                font-size: 24px;
            }
            
            article h3 {
                font-size: 20px;
            }
            
            article p, article li {
                font-size: 15px;
            }
        }