body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1, h2, h3 { color: #FF4500; }
        h1 { font-size: 2.5em; text-align: center; }
        h2 { font-size: 1.8em; margin-top: 30px; }
        h3 { font-size: 1.4em; color: #E67E22; }
        .nav-button { display: none; position: fixed; bottom: 20px; right: 20px; background: #FF4500; color: white; border: none; padding: 10px 15px; border-radius: 5px; cursor: pointer; }
        .logo { font-size: 2em; font-weight: bold; color: #FF4500; text-align: center; margin: 20px 0; }
        .download-btn, .login-btn { display: inline-block; background: #27AE60; color: white; padding: 12px 25px; margin: 15px 0; border-radius: 5px; text-decoration: none; font-weight: bold; }
        .login-btn { background: #3498DB; }
        img { max-width: 100%; height: auto; margin: 20px 0; border-radius: 8px; }
        .mobile-nav { display: none; }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .mobile-nav { display: block; text-align: center; }
            .nav-button { display: block; }
            h1 { font-size: 2em; }
            h2 { font-size: 1.6em; }
        }