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(() => {
  const timer = document.querySelector("[data-assignment-timer]");
  if (!timer) return;

  const expiresAt = Date.parse(timer.dataset.expiresAt || "");
  if (!Number.isFinite(expiresAt)) return;

  const render = () => {
    const remaining = Math.max(0, Math.floor((expiresAt - Date.now()) / 1000));
    const minutes = Math.floor(remaining / 60);
    const seconds = remaining % 60;
    timer.textContent = `${minutes}:${String(seconds).padStart(2, "0")} remaining`;
    if (remaining === 0) {
      document.querySelectorAll(".assignment-form input, .assignment-form button").forEach((control) => {
        control.disabled = true;
      });
      window.location.reload();
      return true;
    }
    return false;
  };

  if (!render()) window.setInterval(render, 1000);
})();