* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { width: 100%; height: 100%; }
.barcode-scanner-title { height: 80px; text-align: center; font-size: 20px; padding: 20px 0; }
.barcode-scanner-view { width: 100%; height: calc(100% - 80px); }
#product-overlay {
  display: none;
  position: fixed;
  top: 15%;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255,255,255,0.95);
  padding: 20px;
  border-radius: 10px;
  z-index: 9999;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}
#product-overlay img {
  max-width: 120px;
  margin: 10px auto;
  border-radius: 6px;
}
#product-overlay button {
  padding: 5px 10px;
}