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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #3e2723;
  font-family: Georgia, 'Times New Roman', serif;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

#game-container {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: pointer;
}

#start-btn {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
  padding: 18px 56px;
  font: bold 22px Georgia, serif;
  color: #fff;
  background: #5a7a3a;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}