body { font-family: Arial, sans-serif; line-height: 1.6; margin: 0; padding: 0; color: #333; }
        .container { max-width: 1200px; margin: 0 auto; padding: 20px; }
        header { background-color: #1e88e5; color: white; padding: 20px; text-align: center; position: relative; }
        .logo { font-size: 28px; font-weight: bold; }
        nav ul { list-style-type: none; padding: 0; }
        nav ul li { display: inline; margin: 0 15px; }
        nav ul li a { color: white; text-decoration: none; }
        .mobile-menu-btn { display: none; position: absolute; top: 20px; right: 20px; background: none; border: none; color: white; font-size: 24px; cursor: pointer; }
        h1 { font-size: 32px; margin-top: 40px; }
        h2 { font-size: 24px; margin-top: 30px; border-bottom: 2px solid #1e88e5; padding-bottom: 5px; }
        h3 { font-size: 20px; margin-top: 25px; }
        .download-btn, .login-btn { display: inline-block; padding: 12px 24px; background-color: #1e88e5; color: white; text-decoration: none; border-radius: 5px; margin: 15px 0; }
        .download-btn:hover, .login-btn:hover { background-color: #0d47a1; }
        .feature-image { max-width: 100%; height: auto; margin: 20px 0; }
        footer { background-color: #333; color: white; padding: 20px; text-align: center; margin-top: 40px; }
        .copyright { margin-top: 20px; font-size: 14px; }
        @media (max-width: 768px) {
            nav ul { display: none; }
            .mobile-menu-btn { display: block; }
            .show-menu { display: block; }
            .container { padding: 10px; }
        }