document.getElementById('reqForm').addEventListener('submit', async e => {
  e.preventDefault();
  const form = e.target;
  const data = {};
  new FormData(form).forEach((v,k)=>{ if(v) data[k]=v; });
  // convert numbers
  if(data.area) data.area = Number(data.area);
  if(data.termMonths) data.termMonths = Number(data.termMonths);
  if(data.price) data.price = Number(data.price);
  const out = document.getElementById('out');
  out.textContent = 'Отправка...';
  try {
    const resp = await fetch('/api/contract', {method:'POST', headers:{'Content-Type':'application/json'}, body:JSON.stringify(data)});
    const json = await resp.json();
    if(json.ok) {
      const r = json.record;
      out.textContent = `Договор готов.\n\n${r.contract}\n\nФлаги: ${r.flags.length? r.flags.map(f=>f.message).join('; ') : 'нет'}\nОтклонения: ${r.deviations.length? r.deviations.map(d=>d.clause+': '+d.diff).join('\n') : 'нет'}`;
    } else {
      out.textContent = 'Ошибка: '+ JSON.stringify(json);
    }
  } catch(err) {
    out.textContent = 'Ошибка сети: '+ err;
  }
});