/* 99 Club Studio · Arithmetic Cages online-play polish v1.69
 * Keep every grid cell exactly square and replace inset dashed cage outlines
 * with clean, solid cage boundaries on the grid lines.
 */
.tt99-play-arithmeticcages .tt99-numbergrid{
  grid-template-columns:repeat(var(--n),minmax(0,1fr));
  grid-template-rows:repeat(var(--n),minmax(0,1fr));
  grid-auto-rows:minmax(0,1fr);
}
.tt99-play-arithmeticcages .tt99-numbergrid-cell{
  width:100%;
  height:100%;
  box-sizing:border-box;
}

/* Arithmetic Cages use one shared solid boundary between neighbouring cages.
 * Top/left edges are sufficient for internal boundaries; the main grid border
 * already supplies the outside bottom/right edge. This avoids doubled lines.
 */
.tt99-play-arithmeticcages .cage-edge{
  z-index:8;
  border:0;
  pointer-events:none;
}
.tt99-play-arithmeticcages .cage-edge.top{
  display:block;
  top:0;
  left:0;
  right:0;
  border-top:3px solid #4f777b;
}
.tt99-play-arithmeticcages .cage-edge.left{
  display:block;
  top:0;
  bottom:0;
  left:0;
  border-left:3px solid #4f777b;
}
.tt99-play-arithmeticcages .cage-edge.bottom,
.tt99-play-arithmeticcages .cage-edge.right{
  display:none;
}
.tt99-play-arithmeticcages .cage-target{
  z-index:9;
  left:5px;
  top:4px;
  background:rgba(255,255,255,.95);
  padding:1px 3px;
}
.tt99-play-arithmeticcages .tt99-numbergrid-cell.is-given .cage-target{
  background:rgba(241,246,245,.96);
}

@media(max-width:560px){
  .tt99-play-arithmeticcages .cage-edge.top{border-top-width:2.5px}
  .tt99-play-arithmeticcages .cage-edge.left{border-left-width:2.5px}
  .tt99-play-arithmeticcages .cage-target{left:4px;top:3px}
}