test

                el.appendChild(outer);

                // --- Auto-expand for openByDefault ---

                if (openByDefault && !items.empty()) {

                    std::string initScript = "(function(){var ids=[";

                    for (size_t i = 0; i < items.size(); ++i) {

                        if (i > 0) initScript += ",";

                        initScript += "'" + rc + "-ans-" + std::to_string(i) + "'";

                    }

                    initScript +=

                        "];for(var i=0;i<ids.length;i++){"

                        "var c=document.getElementById(ids[i]);"

                        "if(c)c.style.maxHeight=c.scrollHeight+'px';"

                        "}})();";

                    libhtmlpp::HtmlElement script("script");

                    script.appendChild(libhtmlpp::TextElement(initScript.c_str()));

                    el.appendChild(script);

                }

                // --- Responsive & Light mode CSS ---

                std::string mediaCSS;