body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1 { color: #FF4500; text-align: center; }
        h2 { color: #0066CC; border-bottom: 2px solid #0066CC; }
        h3 { color: #2E8B57; }
        .logo { font-size: 2em; font-weight: bold; text-shadow: 2px 2px 4px rgba(0,0,0,0.3); }
        .nav { background: #111; padding: 10px; display: flex; justify-content: space-between; }
        .nav-mobile { display: none; }
        @media (max-width: 768px) {
            .nav-desktop { display: none; }
            .nav-mobile { display: block; }
        }
        .download-btn { background: #4CAF50; color: white; padding: 12px 24px; text-decoration: none; border-radius: 5px; }
        .login-btn { background: #2196F3; color: white; padding: 12px 24px; text-decoration: none; border-radius: 5px; }
        img { max-width: 100%; height: auto; margin: 20px 0; }