body {
  font-family: Arial, sans-serif;
  text-align: center;
  background: #f4f4f4;
  margin: 0;
  padding: 20px;
}

video, canvas {
  max-width: 100%;
  width: 400px;
  height: auto;
  margin: 10px 0;
  border: 2px solid #ccc;
  border-radius: 8px;
}

#result {
  margin-top: 20px;
  padding: 10px;
  font-size: 18px;
  font-weight: bold;
  color: black;
  background: #eee;
  border-radius: 8px;
}

button {
  margin: 10px;
  padding: 10px 20px;
  font-size: 16px;
  border: none;
  border-radius: 8px;
  background: #007bff;
  color: white;
  cursor: pointer;
}

button:disabled {
  background: #999;
  cursor: not-allowed;
}

.flash {
  animation: flash-bg 0.8s ease;
}

@keyframes flash-bg {
  0% { background: yellow; }
  100% { background: #eee; }
}