body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1 { font-size: 2.5em; color: #2c3e50; margin-bottom: 10px; }
        h2 { font-size: 1.8em; color: #3498db; margin-top: 30px; }
        h3 { font-size: 1.4em; color: #e74c3c; margin-top: 25px; }
        .logo { font-size: 2em; font-weight: bold; color: #f39c12; text-shadow: 2px 2px 4px rgba(0,0,0,0.1); }
        .nav { display: flex; justify-content: space-between; background: #2c3e50; padding: 15px; color: white; }
        .nav a { color: white; text-decoration: none; margin: 0 10px; }
        .mobile-nav-btn { display: none; background: #34495e; color: white; border: none; padding: 8px 15px; }
        .download-btn { display: inline-block; background: #2ecc71; color: white; padding: 12px 25px; margin: 20px 0; border-radius: 5px; text-decoration: none; font-weight: bold; }
        .login-btn { display: inline-block; background: #3498db; color: white; padding: 12px 25px; margin: 20px 10px; border-radius: 5px; text-decoration: none; font-weight: bold; }
        img { max-width: 100%; height: auto; margin: 20px 0; border-radius: 8px; }
        .tags { margin: 30px 0; }
        .tag { display: inline-block; background: #ecf0f1; padding: 5px 10px; margin: 5px; border-radius: 3px; }
        .footer { background: #2c3e50; color: white; padding: 20px; text-align: center; margin-top: 40px; }
        @media (max-width: 768px) {
            .nav { flex-direction: column; }
            .mobile-nav-btn { display: block; align-self: flex-end; }
            .nav-links { display: none; }
            .nav-links.active { display: block; }
            h1 { font-size: 2em; }
            h2 { font-size: 1.5em; }
        }