body {
  margin: 0;
  font-family: system-ui;
  background: #0f172a;
  color: white;
}

.app {
  display: grid;
  grid-template-columns: 220px 1fr 220px;
  height: 100vh;
}

.sidebar {
  background: #1e293b;
  padding: 10px;
  overflow-y: auto;
}

.canvas-container {
  display: flex;
  justify-content: center;
  align-items: center;
  background: #020617;
}

canvas {
  background: #020617;
  border: 1px solid #334155;
}

button {
  width: 100%;
  padding: 8px;
  margin-bottom: 10px;
  background: #6366f1;
  border: none;
  color: white;
  cursor: pointer;
}

li {
  margin: 5px 0;
  padding: 6px;
  background: #334155;
  cursor: pointer;
}