body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  padding: 1em;
  background-color: #f4f4f9;
  color: #333;
}
.container {
  max-width: 600px;
  margin: 0 auto;
  background-color: #fff;
  padding: 2em;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
#controls {
  display: flex;
  flex-direction: column;
  gap: 15px;
}
input[type="text"] {
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: 1em;
}
button {
  padding: 12px 20px;
  border: none;
  background-color: #007bff;
  color: white;
  border-radius: 4px;
  font-size: 1em;
  cursor: pointer;
  transition: background-color 0.2s;
}
button:hover {
  background-color: #0056b3;
}
button:disabled {
  background-color: #cccccc;
  cursor: not-allowed;
  opacity: 0.6;
}
#qr-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 20px;
  width: 100%;
  padding: 10px;
  box-sizing: border-box;
}

#qr-grid.status-message {
  display: block;
  text-align: center;
  width: 100%;
  padding: 10px;
  font-size: 14px;
  color: #666;
}
#qr-grid img {
  width: 100%;
  border: 1px solid #eee;
  border-radius: 4px;
}
#thinking-indicator {
  display: none;
}

#thinking-indicator.show {
  display: inline-block;
}

#thinking-indicator span {
  color: #666;
  font-size: 14px;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

@media (max-width: 600px) {
  #qr-grid {
    grid-template-columns: 1fr;
  }
  .container {
    padding: 1em;
  }
}