* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: #f7f7f7;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  font-family: 'Courier New', monospace;
}

#game-container {
  position: relative;
  user-select: none;
}

#score-board {
  display: flex;
  justify-content: space-between;
  width: 800px;
  padding: 0 4px 6px;
  font-size: 18px;
  font-weight: bold;
  color: #555;
  letter-spacing: 2px;
}

#game-canvas {
  display: block;
  border-bottom: 3px solid #535353;
  background: #fff;
  cursor: pointer;
}

#message {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  pointer-events: none;
}

#message-title {
  font-size: 28px;
  font-weight: bold;
  color: #535353;
  letter-spacing: 4px;
  margin-bottom: 8px;
}

#message-sub {
  font-size: 14px;
  color: #888;
  letter-spacing: 2px;
}

#message.hidden {
  display: none;
}