.qr-output { display: flex; flex-direction: column; }

.qr-preview {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px;
  min-height: 320px;
  margin-bottom: 16px;
}
.qr-preview canvas {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 6px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.45);
}
.qr-preview.empty {
  color: var(--text-dim);
  font-size: 14px;
}