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-top: 30px; }
        h1 { font-size: 2.5em; border-bottom: 2px solid #e74c3c; padding-bottom: 10px; }
        h2 { font-size: 2em; }
        h3 { font-size: 1.5em; }
        .logo { font-size: 2em; font-weight: bold; color: #e74c3c; text-align: center; margin: 20px 0; }
        .nav { background-color: #34495e; padding: 10px; display: flex; justify-content: space-between; align-items: center; }
        .nav a { color: white; text-decoration: none; margin: 0 10px; }
        .mobile-nav-btn { display: none; background: none; border: none; color: white; font-size: 1.5em; }
        .content-img { max-width: 100%; height: auto; margin: 20px 0; }
        .download-btn, .login-btn { display: inline-block; padding: 10px 20px; background-color: #e74c3c; color: white; text-decoration: none; border-radius: 5px; margin: 10px 0; }
        .tags { margin: 20px 0; }
        .tag { display: inline-block; background-color: #3498db; color: white; padding: 5px 10px; margin: 5px; border-radius: 3px; }
        .footer { margin-top: 50px; padding: 20px; background-color: #2c3e50; color: white; text-align: center; }
        @media (max-width: 768px) {
            .nav { flex-direction: column; }
            .mobile-nav-btn { display: block; }
            .nav-links { display: none; width: 100%; text-align: center; }
            .nav-links.active { display: block; }
            .nav-links a { display: block; padding: 10px; }
        }