:root {
  color-scheme: light;
  background: #dff6fb;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
}

* { box-sizing: border-box; }

html, body, #game-shell {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
}

body {
  background: #dff6fb;
  touch-action: none;
  user-select: none;
}

#game-canvas {
  display: block;
  width: 100vw;
  height: 100vh;
  outline: none;
}

#orientation-note {
  display: none;
  position: fixed;
  inset: 0;
  align-items: center;
  justify-content: center;
  background: #dff6fb;
  color: #4b4772;
  font-size: 20px;
  font-weight: 700;
}

@media (orientation: portrait) and (max-width: 700px) {
  #orientation-note { display: flex; }
  #game-canvas { visibility: hidden; }
}