.password_strength {
  /* The meter and the tip are laid out from the start and only fade in, so a
     password being typed never shifts the fields below it. */
  .password_strength_track {
    height: 4px;
    background: var(--color-bg-secondary);
    border-radius: 2px;
    margin-top: 0.5rem;
    opacity: 0;
    transition: opacity 0.2s ease;
  }

  .password_strength_bar {
    height: 100%;
    width: 0%;
    border-radius: 2px;
    transition: width 0.3s ease, background-color 0.3s ease;

    &[data-level="0"] { background-color: var(--color-danger); }
    &[data-level="1"],
    &[data-level="2"] { background-color: var(--color-accent-amber); }
    &[data-level="3"] { background-color: var(--color-accent-green); }
    &[data-level="4"] { background-color: var(--color-success-dark); }
  }

  .password_strength_feedback {
    font-size: var(--text-xs);
    color: var(--color-text-light);
    margin-top: 0.25rem;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.2s ease, visibility 0.2s;
  }

  /* Any rated password reveals the meter; only a weak one reveals the tip. */
  &:has(.password_strength_bar[data-level]) .password_strength_track {
    opacity: 1;
  }

  &:has(.password_strength_bar:is([data-level="0"], [data-level="1"], [data-level="2"])) .password_strength_feedback {
    visibility: visible;
    opacity: 1;
  }
}