body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1 { color: #2c3e50; text-align: center; margin-bottom: 30px; }
        h2 { color: #e74c3c; border-bottom: 2px solid #f1c40f; padding-bottom: 5px; }
        h3 { color: #3498db; }
        .logo { font-size: 28px; font-weight: bold; color: #e67e22; text-align: center; margin: 20px 0; }
        .download-btn { background: #2ecc71; color: white; padding: 10px 20px; border-radius: 5px; text-decoration: none; display: inline-block; margin: 15px 0; }
        .login-btn { background: #3498db; color: white; padding: 10px 20px; border-radius: 5px; text-decoration: none; display: inline-block; margin: 15px 0; }
        .nav { background: #2c3e50; padding: 10px; text-align: center; }
        .nav a { color: white; margin: 0 15px; text-decoration: none; }
        .mobile-nav-toggle { display: none; background: #e74c3c; color: white; padding: 10px; cursor: pointer; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .footer { background: #2c3e50; color: white; padding: 20px; text-align: center; margin-top: 30px; }
        @media (max-width: 768px) {
            .mobile-nav-toggle { display: block; }
            .nav { display: none; }
            .nav.active { display: block; }
            .nav a { display: block; margin: 10px 0; }
        }