body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 0 15px; }
        h1 { color: #e74c3c; text-align: center; margin-bottom: 0; }
        h2 { color: #2980b9; margin-top: 30px; }
        h3 { color: #27ae60; }
        .download-btn, .login-btn { display: inline-block; padding: 10px 20px; background: #e74c3c; color: #fff; text-decoration: none; margin: 10px 0; border-radius: 5px; }
        .mobile-nav { display: none; }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .mobile-nav { display: block; text-align: center; padding: 10px; background: #2c3e50; color: white; }
            .mobile-nav button { background: none; border: none; color: white; font-size: 18px; }
            #mobile-menu { display: none; }
        }
        .logo { font-size: 28px; font-weight: bold; color: #e74c3c; text-align: center; margin: 20px 0; }
        img { max-width: 100%; height: auto; margin: 20px 0; }