body { font-family: 'Arial', sans-serif; line-height: 1.6; max-width: 1200px; margin: 0 auto; padding: 20px; color: #333; }
        h1 { color: #e67e22; border-bottom: 3px solid #f39c12; padding-bottom: 10px; }
        h2 { color: #2980b9; margin-top: 30px; }
        h3 { color: #27ae60; }
        .nav { background: #34495e; padding: 15px; position: sticky; top: 0; z-index: 100; }
        .nav a { color: white; margin: 0 15px; text-decoration: none; }
        .mobile-nav-btn { display: none; background: #2c3e50; color: white; padding: 10px; cursor: pointer; }
        .btn { display: inline-block; padding: 10px 20px; background: #e74c3c; color: white; margin: 15px 0; text-decoration: none; border-radius: 5px; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .tag { background: #ecf0f1; padding: 5px 10px; margin: 5px; display: inline-block; }
        @media (max-width: 768px) {
            .nav { display: none; }
            .mobile-nav-btn { display: block; }
            .nav.active { display: block; }
        }