* {
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  text-align: center;
  background: #f0f9ff;
  margin: 0;
  padding: 20px;
  color: #333;
}

#game-container {
  max-width: 850px;
  margin: 0 auto;
  background: white;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

h1 {
  color: #2c7fb8;
  margin-bottom: 10px;
}

canvas {
  border: 2px solid #aaa;
  border-radius: 8px;
  background: #e6f7e6;
  margin-top: 15px;
  cursor: pointer;
  display: block;
}

button {
  margin: 8px 5px;
  padding: 10px 16px;
  font-size: 14px;
  background: #2c7fb8;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s;
}

button:hover {
  background: #216a9f;
}

#colorPicker {
  height: 38px;
  margin: 5px;
  border: 1px solid #ccc;
  border-radius: 6px;
}

label {
  margin-left: 5px;
  font-size: 14px;
  color: #555;
}