html, body {
  margin: 0; padding: 0;
  height: 100%;
  background: #0b0714;
  overflow: hidden;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-user-select: none; user-select: none;
  -webkit-tap-highlight-color: transparent;
}
#wrap {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
}
#game {
  background: #000;
  touch-action: none;
  cursor: pointer;
  box-shadow: 0 0 60px rgba(120, 80, 255, 0.25);
  max-width: 100vw; max-height: 100vh;
}
#rotate-tip {
  display: none;
  position: fixed; top: 12px; left: 50%; transform: translateX(-50%);
  color: #ffd76a; background: rgba(20, 10, 40, .9);
  padding: 6px 14px; border-radius: 18px; font-size: 13px; z-index: 5;
}
@media (orientation: landscape) and (max-height: 500px) {
  #rotate-tip { display: block; }
}