body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1, h2, h3 { color: #2c3e50; margin: 25px 0 15px; }
        h1 { font-size: 2.2em; border-bottom: 3px solid #e74c3c; }
        h2 { font-size: 1.8em; border-left: 5px solid #e74c3c; padding-left: 10px; }
        h3 { font-size: 1.4em; color: #c0392b; }
        .download-btn { background: #27ae60; color: white; padding: 12px 25px; margin: 15px 0; display: inline-block; border-radius: 5px; }
        .login-btn { background: #3498db; color: white; padding: 12px 25px; margin: 15px 0; display: inline-block; border-radius: 5px; }
        .nav-mobile { display: none; background: #2c3e50; color: white; padding: 10px; text-align: center; cursor: pointer; }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .nav-mobile { display: block; }
        }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .tag { background: #f1f1f1; padding: 5px 10px; margin: 5px; display: inline-block; border-radius: 3px; }