.app_check {
  background: #222;
  padding: 30px;
  border-radius: 12px;
  min-width: 500px;
  margin: 50px auto;
  color: #fff;
  font-size: clamp(14px, 4vw, 18px);
}
.app_check h2 {
  text-align: center;
  margin-bottom: 20px;
}

.app_check input,
.app_check textarea {
  width: 100%;
  padding: 12px;
  margin-top: 6px;
  margin-bottom: 0;
  border-radius: 8px;
  border: 1px solid #555;
  background: #333;
  color: #fff;
}

.app_check button {
  display: block;
  margin: 0 auto;
}

.hint {
  display: block;
  font-size: 0.85rem;
  color: #777;
  white-space: normal;
  word-wrap: break-word;
  overflow-wrap: break-word;
  line-height: 1.4;
  margin-top: 4px;
  max-width: 500px;
}
.alert.success {
  width: fit-content;
  margin: 0 auto;
  background: #0f5132;
  color: #d1e7dd;
  border: 1px solid #198754;
  padding: 12px 16px;
  border-radius: 6px;
  margin-bottom: 20px;
  font-weight: 500;
}