/* 星际飞车 · 样式(与 game-richer4 同款布局:画布等比撑满视口) */
html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background: #0b0316;
  overflow: hidden;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
}
#game {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  max-width: 100vw;
  max-height: 100vh;
  aspect-ratio: 16 / 9;
  background: #12002b;
}
/* 手机竖屏:旋转提示(粗指针设备才显示) */
#rotate-hint {
  display: none;
  position: fixed;
  left: 0; right: 0; top: 0; bottom: 0;
  z-index: 10;
  background: rgba(11, 3, 22, 0.94);
  color: #ffd23f;
  font-size: 20px;
  letter-spacing: 2px;
  text-align: center;
  line-height: 100vh;
}
@media (orientation: portrait) and (pointer: coarse) {
  #rotate-hint { display: block; }
}