body { font-family: 'Segoe UI', Arial, sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1 { color: #d72323; border-bottom: 3px solid #ff9900; padding-bottom: 10px; }
        h2 { color: #ff6600; margin-top: 30px; }
        h3 { color: #339966; }
        .logo { font-size: 2.2em; font-weight: bold; color: #d72323; text-shadow: 2px 2px 4px #ff9900; }
        .nav-btn { display: none; background: #ff9900; color: white; padding: 8px 15px; border-radius: 5px; cursor: pointer; }
        .download-btn { background: #4CAF50; color: white; padding: 12px 25px; text-decoration: none; display: inline-block; margin: 15px 0; }
        .login-btn { background: #2196F3; color: white; padding: 12px 25px; text-decoration: none; display: inline-block; margin: 15px 0; }
        img { max-width: 100%; height: auto; margin: 20px 0; border-radius: 8px; }
        .mobile-nav { display: none; }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .nav-btn { display: block; }
            .mobile-nav { display: none; background: #333; padding: 15px; }
            .mobile-nav a { color: white; display: block; padding: 10px; }
        }