#spectral-analyzer-app {
  font-family: Arial, sans-serif;
  max-width: 100%;
  margin: 20px auto;
  padding: 10px;
  background: #fafafa;
  border: 1px solid #ccc;
  border-radius: 6px;
}
h2 { margin-top: 0; }
.canvas-container {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  justify-content: center;
  margin-bottom: 15px;
}
.canvas-container > div {
  flex: 1 1 300px;
  text-align: center;
}
canvas, video {
  width: 100%;
  height: auto;
  max-width: 320px;
  background: #222;
  border: 1px solid #888;
  border-radius: 4px;
}
button {
  margin-top: 8px;
  padding: 6px 12px;
  font-size: 14px;
}
button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
#learning-section {
  border-top: 1px solid #ccc;
  padding-top: 10px;
  margin-top: 15px;
}
#learning-section label {
  margin-right: 10px;
}
#learning-section input,
#learning-section select {
  margin: 0 5px;
}
pre {
  margin-top: 15px;
  padding: 10px;
  background: #fff;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-family: monospace;
  white-space: pre-wrap;
  max-height: 300px;
  overflow-y: auto;
}