.circuit-game {
  --circuit-gap: 4px;
  --circuit-wire: #9ca8c5;
  width: min(100%, 490px);
  display: grid;
  gap: 12px;
}

.circuit-status, .circuit-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 6px 12px;
}

.circuit-status p, .circuit-hint { margin: 0; color: var(--muted); }
.circuit-status strong { color: var(--gold); font-size: 1.4rem; font-variant-numeric: tabular-nums; }
.circuit-status #circuit-state { font-weight: 700; }
.circuit-game.is-connected #circuit-state { color: var(--cyan); }
.circuit-legend { font-size: 0.84rem; color: var(--paper); }

.circuit-legend span { display: inline-flex; align-items: center; gap: 0.4em; }
.circuit-legend i { width: 8px; height: 8px; border-radius: 50%; }
.circuit-power-dot, .circuit-power { background: var(--gold); }
.circuit-receiver-dot, .circuit-receiver { border: 1px solid var(--cyan); background: #284052; }

.circuit-board {
  display: grid;
  grid-template-columns: clamp(10px, 3vw, 18px) minmax(0, 1fr) clamp(10px, 3vw, 18px);
  padding-block: 6px;
  border-block: 1px solid var(--border);
  background: #111722;
}

.circuit-tiles {
  display: grid;
  grid-template-columns: repeat(var(--circuit-size), minmax(0, 1fr));
  gap: var(--circuit-gap);
}

.circuit-rail {
  display: grid;
  grid-template-rows: repeat(var(--circuit-size), minmax(0, 1fr));
  gap: var(--circuit-gap);
}

.circuit-terminal { height: 9px; align-self: center; }
.circuit-power { border-radius: 9px 0 0 9px; box-shadow: 0 0 10px #ffc68088; }
.circuit-receiver { border-radius: 0 9px 9px 0; }
.circuit-game.is-connected .circuit-receiver { background: var(--cyan); box-shadow: 0 0 10px #a9e8fa88; }

.circuit-game .circuit-tile {
  position: relative;
  display: block;
  min-height: 44px;
  aspect-ratio: 1;
  padding: 0;
  border: 1px solid #535d77;
  border-radius: 7px;
  background: #222b3d;
  color: var(--circuit-wire);
  touch-action: manipulation;
}

.circuit-game .circuit-tile:focus-visible { z-index: 1; outline-offset: 0; }
.circuit-tile.is-powered { background: #1f3a48; color: var(--cyan); }
.circuit-tile svg { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.circuit-tile path { fill: none; stroke: currentColor; stroke-width: 9; }
.circuit-tile path.is-open { visibility: hidden; }
.circuit-tile circle { fill: currentColor; }
.circuit-tile.is-powered svg { filter: drop-shadow(0 0 3px #a9e8fa88); }

.circuit-hint { font-size: 0.87rem; line-height: 1.45; }
.circuit-reset { justify-self: start; }

@media (max-width: 390px) {
  .circuit-game { --circuit-gap: 3px; gap: 9px; }
  .circuit-tile path { stroke-width: 11; }
}