body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        .mobile-nav { display: none; }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .mobile-nav { display: block; }
            body { padding: 10px; }
        }
        .logo { font-size: 2.5em; font-weight: bold; color: #FF9900; text-shadow: 2px 2px 4px rgba(0,0,0,0.1); margin-bottom: 20px; }
        nav a { margin: 0 10px; text-decoration: none; color: #0066CC; }
        .download-btn { background: #4CAF50; color: white; padding: 10px 20px; border-radius: 5px; text-decoration: none; display: inline-block; margin: 10px 0; }
        .login-btn { background: #2196F3; color: white; padding: 10px 20px; border-radius: 5px; text-decoration: none; display: inline-block; margin: 10px 0; }
        img { max-width: 100%; height: auto; margin: 15px 0; border-radius: 8px; }
        h1 { color: #FF5722; border-bottom: 2px solid #FF9900; padding-bottom: 10px; }
        h2 { color: #673AB7; margin-top: 30px; }
        h3 { color: #009688; }
        .tag { background: #E0E0E0; padding: 3px 8px; border-radius: 12px; margin: 5px; display: inline-block; }
        footer { margin-top: 40px; padding-top: 20px; border-top: 1px solid #ddd; }