body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        .logo { font-size: 28px; font-weight: bold; color: #0066cc; margin-bottom: 20px; }
        nav { background: #f5f5f5; padding: 10px; margin-bottom: 20px; }
        nav a { margin: 0 10px; text-decoration: none; color: #0066cc; }
        .mobile-nav-toggle { display: none; }
        h1 { font-size: 2.2em; margin: 30px 0 20px; }
        h2 { font-size: 1.8em; margin: 25px 0 15px; color: #0066cc; }
        h3 { font-size: 1.5em; margin: 20px 0 10px; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .download-btn, .login-btn { display: inline-block; padding: 12px 25px; background: #0066cc; color: white; border-radius: 5px; margin: 10px 0; text-decoration: none; }
        .highlight { font-weight: bold; color: #0066cc; }
        footer { margin-top: 40px; padding: 20px 0; border-top: 1px solid #eee; }
        @media (max-width: 768px) {
            .mobile-nav-toggle { display: block; }
            nav { display: none; }
            .nav-active { display: block; }
            h1 { font-size: 1.8em; }
            h2 { font-size: 1.5em; }
        }