body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; }
        h1 { color: #d42f2f; text-align: center; }
        h2 { color: #e67e22; border-bottom: 2px solid #f39c12; padding-bottom: 5px; }
        h3 { color: #2980b9; }
        .nav { background: #d42f2f; color: white; padding: 15px; position: sticky; top: 0; display: flex; justify-content: space-between; align-items: center; }
        .nav-links a { color: white; margin: 0 10px; text-decoration: none; }
        .mobile-toggle { display: none; }
        .content-img { max-width: 100%; height: auto; margin: 20px 0; }
        .download-btn, .login-btn { background: #27ae60; color: white; padding: 10px 20px; text-decoration: none; border-radius: 5px; margin: 10px 0; display: inline-block; }
        .tag { background: #f1f1f1; padding: 5px 10px; margin: 5px; border-radius: 3px; }
        footer { background: #333; color: white; padding: 20px; text-align: center; margin-top: 30px; }
        @media (max-width: 768px) {
            .nav-links { display: none; }
            .mobile-toggle { display: block; }
            .nav.active .nav-links { display: flex; flex-direction: column; }
        }