/* 游戏画布 + 全屏居中；外壳样式来自 /games/shared/gf-shell.css */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
  width: 100%;
  height: 100%;
  background: #0a0a18;
  overflow: hidden;
  font-family: system-ui, "PingFang SC", sans-serif;
}
body {
  display: flex;
  align-items: center;
  justify-content: center;
}
canvas#cv {
  display: block;
  touch-action: none;
  max-width: 100%;
  max-height: 100%;
}