* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
}

body {
  background: #0f172a;
  color: #e5e7eb;
}

.container {
  max-width: 900px;
  margin: auto;
  padding: 20px;
}

.title {
  text-align: center;
  margin-bottom: 20px;
}

.card {
  background: #111827;
  border: 1px solid #1f2937;
  border-radius: 10px;
  padding: 15px;
}

label {
  display: block;
  margin-top: 10px;
  margin-bottom: 5px;
  font-size: 14px;
}

input {
  width: 100%;
  padding: 12px;
  border-radius: 6px;
  border: 1px solid #374151;
  background: #020617;
  color: #fff;
  font-size: 16px;
}

.btn {
  width: 100%;
  padding: 14px;
  background: #2563eb;
  border: none;
  border-radius: 8px;
  color: white;
  font-size: 16px;
  cursor: pointer;
  text-align: center;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.btn:hover {
  background: #1d4ed8;
}

.hidden {
  display: none;
}

.form-row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

.form-row .field {
  min-width: 0;
}

.form-row-2 .field {
  flex: 1 1 50%;
}

.form-row-2-1 .field:first-child {
  flex: 2 1 66.666%;
}

.form-row-2-1 .field:last-child {
  flex: 1 1 33.333%;
}

.result-row {
  display: flex;
  gap: 10px;
  align-items: stretch;
}

.result-row input {
  flex: 1;
}

.btn-small {
  width: auto;
  min-width: 140px;
  padding: 12px 16px;
  white-space: nowrap;
}

.qr-row {
  margin-top: 14px;
  display: flex;
  gap: 16px;
  align-items: stretch;
}

.qr-block {
  flex: 0 0 220px;
  margin-top: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #0b1220;
  border: 1px solid #1f2937;
  border-radius: 8px;
  padding: 12px;
}

.qr-block img {
  display: block;
  background: white;
  padding: 10px;
  border-radius: 8px;
  width: 180px;
  max-width: 100%;
  height: auto;
}

.qr-side-actions {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.qr-side-actions .btn {
  flex: 1 1 50%;
  min-height: 64px;
}

@media (max-width: 768px) {
  .form-row,
  .result-row,
  .qr-row {
    flex-direction: column;
  }

  .form-row-2 .field,
  .form-row-2-1 .field:first-child,
  .form-row-2-1 .field:last-child {
    flex: 1 1 100%;
  }

  .btn-small {
    width: 100%;
  }

  .qr-block {
    flex: none;
  }

  .qr-side-actions .btn {
    min-height: auto;
  }
}