body {
  font-family: Arial, sans-serif;
  background-color: #f0f0f0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
}

.container {
  background-color: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  text-align: center;
  width: min(520px, calc(100vw - 32px));
}

h1 {
  font-size: 20px;
  margin: 0 0 14px 0;
}

.canvas-wrap {
  display: grid;
  place-items: center;
  gap: 10px;
  margin: 10px auto 0;
}

canvas {
  width: 320px;
  height: 240px;
  border: 2px solid #ccc;
  border-radius: 6px;
  background: #fff;
  touch-action: none;
}

.hint {
  font-size: 12px;
  line-height: 1.35;
  color: #666;
  user-select: none;
}

.buttons {
  margin-top: 16px;
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

button {
  padding: 10px 16px;
  font-size: 16px;
  background-color: white;
  color: #333;
  border: 2px solid #ccc;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

button:hover {
  background-color: #f0f0f0;
  border-color: #aaa;
  color: #000;
}

#status {
  margin-top: 14px;
  color: #333;
  min-height: 1.2em;
  word-break: break-word;
}