(function (window, document) {

function addUTMsToForm() {
  function addHiddenFields() {
    try {
      const form = document.querySelector('form[action*="convertkit.com"], form[action*="kit.com"]');
      
      if (!form) {
        return;
      }
      
      function appendHidden(name, value){
        const oldHidden = form.querySelector('input[name="'+name+'"]');
        if (oldHidden) {
          oldHidden.remove();
        }
        const hidden = document.createElement('input');
        hidden.type = 'hidden';
        hidden.name = name;
        hidden.value = value;
        form.appendChild(hidden);
      }
      
      const searchParams = window.location.search;
      if (searchParams) {
        appendHidden('search', searchParams);
      }

      appendHidden('host', document.location.href);
      appendHidden('referrer', document.referrer);
    } catch (error) {
      console.error('UTM Tracker error:', error);
    }
  }
  
  setTimeout(addHiddenFields, 100);
  
  return addHiddenFields;
}

addUTMsToForm();

})(window, document);