.captcha-box { margin: 1rem 0; }
.captcha-label { display: block; font-weight: 600; margin-bottom: .4rem; }
.captcha-row { display: flex; align-items: center; gap: .5rem; margin-bottom: .5rem; }
.captcha-img { display: block; max-width: 100%; height: auto; border-radius: 6px;
  border: 1px solid rgba(127,127,127,.35); user-select: none; -webkit-user-select: none; }
.captcha-refresh { font: inherit; font-size: 1.3rem; line-height: 1; padding: .35rem .55rem;
  background: transparent; color: inherit; border: 1px solid rgba(127,127,127,.35);
  border-radius: 6px; cursor: pointer; }
.captcha-refresh:hover { border-color: currentColor; }
.captcha-input { width: 8rem; }
.captcha-box.is-ok  .captcha-input { border-color: #2e8b57; box-shadow: 0 0 0 2px rgba(46,139,87,.25); }
.captcha-box.is-bad .captcha-input { border-color: #c0392b; box-shadow: 0 0 0 2px rgba(192,57,43,.25); }
.captcha-msg { min-height: 1.2em; font-size: .875rem; margin-top: .25rem; color: #c0392b; }
form [type="submit"]:disabled, form button:not([type]):disabled { opacity: .5; cursor: not-allowed; }