export function isValidDomain(domain: string): boolean {
  const d = domain.trim().replace(/\.$/, "");
  const re = /^(?=.{1,253}$)(?!-)[A-Za-z0-9-]{1,63}(?<!-)(\.(?!-)[A-Za-z0-9-]{1,63}(?<!-))+$/;
  return re.test(d);
}
export function normalizeDomain(domain: string): string {
  return domain.trim().toLowerCase().replace(/^https?:\/\//, "").replace(/\/.*$/, "").replace(/\.$/, "");
}
export function normalizeUrl(input: string): string {
  let url = input.trim();
  if (!/^https?:\/\//i.test(url)) url = "https://" + url;
  try { return new URL(url).toString(); } catch { return ""; }
}