body {
  margin: 0;
  background: #111;
  color: white;
  font-family: "Segoe UI", sans-serif;
  display: flex;
  flex-direction: column;
  height: 100vh;
}

header {
  background: #222;
  padding: 10px 20px;
  text-align: center;
  border-bottom: 2px solid #333;
}

#toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  background: #181818;
  padding: 10px;
  justify-content: center;
  align-items: center;
  border-bottom: 1px solid #333;
}

#toolbar select, #toolbar input, #toolbar button {
  background: #333;
  color: white;
  border: 1px solid #444;
  border-radius: 5px;
  padding: 5px 10px;
}

#toolbar button:hover {
  background: #555;
}

#cableCanvas {
  flex: 1;
  border-top: 2px solid #333;
  background: #202020;
  cursor: crosshair;
}

footer {
  background: #222;
  padding: 5px;
  text-align: center;
  font-size: 0.9em;
  border-top: 1px solid #333;
}