body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; background: linear-gradient(135deg, #1a2a6c, #b21f1f); color: white; padding: 20px; }
        .container { max-width: 1200px; margin: 0 auto; }
        h1 { color: #ffd700; text-align: center; }
        h2 { color: #ff9900; border-bottom: 2px solid #ff9900; }
        h3 { color: #ffcc00; }
        .nav { background: rgba(0,0,0,0.8); padding: 10px; position: sticky; top: 0; }
        .nav-mobile { display: none; }
        .download-btn { background: #4CAF50; color: white; padding: 10px 20px; text-align: center; display: inline-block; margin: 10px 0; }
        .login-btn { background: #2196F3; color: white; padding: 10px 20px; text-align: center; display: inline-block; margin: 10px 0; }
        .image-container { text-align: center; margin: 20px 0; }
        img { max-width: 100%; height: auto; }
        .footer { margin-top: 30px; padding-top: 20px; border-top: 1px solid #ccc; }
        @media (max-width: 768px) {
            .nav-desktop { display: none; }
            .nav-mobile { display: block; }
        }