body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f5f5f5;
  color: #222;
}

#app {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px;
}

header {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

nav button {
  margin-right: 8px;
  padding: 8px 12px;
}

.view {
  display: none;
  margin-top: 16px;
  background: #fff;
  padding: 16px;
  border-radius: 8px;
}

.view.active {
  display: block;
}

#device-list {
  list-style: none;
  padding: 0;
}

#device-list li {
  padding: 8px 0;
  cursor: pointer;
}

canvas {
  margin-top: 12px;
}