var form = document.getElementById("reg-form");
if (form) {
  form.addEventListener("submit", async function (e) {
    e.preventDefault();
    var data = Object.fromEntries(new FormData(form).entries());
    try {
      var r = await fetch("api/registrations", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(data)
      });
      if (!r.ok) throw new Error("HTTP " + r.status);
      form.style.display = "none";
      document.getElementById("reg-success").style.display = "block";
    } catch (err) {
      alert("Не получилось отправить заявку. Попробуй ещё раз.");
    }
  });
}