body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1, h2, h3 { color: #FF6600; margin-top: 1.5em; }
        h1 { font-size: 2.2em; }
        h2 { font-size: 1.8em; }
        h3 { font-size: 1.4em; }
        .logo { font-size: 2.5em; font-weight: bold; color: #FF4500; text-align: center; margin: 20px 0; }
        .nav { background: #333; color: white; padding: 10px; position: sticky; top: 0; }
        .nav a { color: white; margin: 0 15px; text-decoration: none; }
        .mobile-nav-toggle { display: none; }
        @media (max-width: 768px) {
            .nav { display: none; }
            .mobile-nav-toggle { display: block; background: #FF4500; color: white; padding: 10px; text-align: center; }
            .nav.active { display: block; }
        }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .btn { display: inline-block; background: #FF4500; color: white; padding: 10px 20px; margin: 10px 0; text-decoration: none; border-radius: 5px; }
        .download-section, .login-section { background: #f5f5f5; padding: 20px; margin: 20px 0; border-radius: 5px; }
        footer { background: #333; color: white; padding: 20px; text-align: center; margin-top: 40px; }