body {
  font-family: system-ui, sans-serif;
  max-width: 900px;
  margin: 20px auto;
  color: #222;
}

h1 {
  margin-bottom: 4px;
}

#controls {
  margin: 12px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

#size {
  width: 60px;
}

#status {
  margin-bottom: 10px;
  font-weight: bold;
  min-height: 1.2em;
}

#main {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

canvas {
  background: #dcb35c;
  border: 1px solid #333;
  display: block;
  flex: 0 0 auto;
}

#historyPanel {
  flex: 1 1 auto;
  min-width: 140px;
}

#historyPanel h3 {
  margin: 0 0 6px;
  font-size: 0.95em;
}

#historyList {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 640px;
  overflow-y: auto;
  font-family: ui-monospace, monospace;
  font-size: 0.85em;
  border: 1px solid #ccc;
  border-radius: 4px;
}

#historyList li {
  padding: 2px 8px;
}

#historyList li:nth-child(even) {
  background: #f2f2f2;
}

#legend {
  margin-top: 16px;
  font-size: 0.9em;
  color: #444;
}