/* ── Password strength meter (shared by base.html and standalone pages) ── */
function _pwStrengthLevel(pw) {
  var score = 0;
  if (pw.length >= 8)          score++;
  if (pw.length >= 12)         score++;
  if (/[A-Z]/.test(pw))        score++;
  if (/[0-9]/.test(pw))        score++;
  if (/[^A-Za-z0-9]/.test(pw)) score++;
  var map = ['pw-weak','pw-weak','pw-fair','pw-strong','pw-great','pw-great'];
  var lbl = ['Weak','Weak','Fair','Strong','Very strong','Very strong'];
  return { cls: map[score], label: lbl[score] };
}

function attachPasswordStrength(inputId, fillId, labelId) {
  var input = document.getElementById(inputId);
  var fill  = document.getElementById(fillId);
  var lbl   = document.getElementById(labelId);
  if (!input || !fill || !lbl) return;
  input.addEventListener('input', function() {
    if (!this.value) {
      fill.className = 'pw-strength-fill';
      lbl.className  = 'pw-strength-label';
      lbl.textContent = '';
      return;
    }
    var r = _pwStrengthLevel(this.value);
    fill.className  = 'pw-strength-fill ' + r.cls;
    lbl.className   = 'pw-strength-label ' + r.cls;
    lbl.textContent = r.label;
  });
}