.go-app .header h1 {
  letter-spacing: 0.04em;
}

.go-controls {
  margin-bottom: 1rem;
}

.go-control-row {
  gap: 0.65rem;
}

.go-main {
  align-items: flex-start;
}

.go-board {
  --go-n: 9;
  --cell-size: min(9vmin, 44px);
  --pad: calc(var(--cell-size) * 0.42);
  display: grid;
  grid-template-columns: repeat(var(--go-n), var(--cell-size));
  grid-template-rows: repeat(var(--go-n), var(--cell-size));
  width: calc(var(--go-n) * var(--cell-size));
  aspect-ratio: 1;
  position: relative;
  padding: var(--pad);
  border-radius: calc(var(--radius) + 4px);
  background-color: #c4a574;
  background-image:
    linear-gradient(165deg, #a67c52 0%, #d4b896 40%, #c9a86c 70%, #8b6914 100%);
  box-shadow:
    inset 0 0 0 2px rgba(255, 255, 255, 0.15),
    inset 0 -10px 28px rgba(0, 0, 0, 0.2),
    0 12px 40px rgba(0, 0, 0, 0.45);
  border: 3px solid #5c4033;
}

.go-board::before {
  content: "";
  position: absolute;
  inset: var(--pad);
  border-radius: 2px;
  background-image:
    linear-gradient(#4a3528 1px, transparent 1px),
    linear-gradient(90deg, #4a3528 1px, transparent 1px);
  background-size:
    var(--cell-size) var(--cell-size),
    var(--cell-size) var(--cell-size);
  pointer-events: none;
  opacity: 0.88;
}

.go-cell {
  position: relative;
  z-index: 1;
  width: var(--cell-size);
  height: var(--cell-size);
  margin: 0;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.go-cell:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.go-cell.star::after {
  content: "";
  position: absolute;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #3d2819;
  opacity: 0.55;
  pointer-events: none;
  z-index: 0;
}

.go-cell:disabled {
  cursor: default;
  opacity: 1;
}

.go-cell .go-stone {
  width: calc(var(--cell-size) * 0.78);
  height: calc(var(--cell-size) * 0.78);
  border-radius: 50%;
  pointer-events: none;
  position: relative;
  z-index: 2;
}

.go-cell.black .go-stone {
  background: radial-gradient(circle at 32% 28%, #5a5a5a 0%, #1a1a1a 45%, #000 100%);
  box-shadow:
    0 2px 5px rgba(0, 0, 0, 0.45),
    inset 0 1px 2px rgba(255, 255, 255, 0.1);
}

.go-cell.white .go-stone {
  background: radial-gradient(circle at 32% 28%, #fff 0%, #f5f3ef 45%, #ccc8c0 100%);
  box-shadow:
    0 2px 5px rgba(0, 0, 0, 0.3),
    inset 0 -1px 2px rgba(0, 0, 0, 0.06);
}

.go-cell.last .go-stone::after {
  content: "";
  position: absolute;
  inset: 38%;
  border-radius: 50%;
  background: rgba(56, 189, 248, 0.65);
  box-shadow: 0 0 6px rgba(56, 189, 248, 0.5);
}

.go-cell.white.last .go-stone::after {
  background: rgba(251, 113, 133, 0.55);
  box-shadow: 0 0 6px rgba(251, 113, 133, 0.45);
}

.go-panel .go-help {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.go-stats {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.4rem 0.75rem;
  margin: 0;
  font-size: 0.92rem;
}

.go-stats dt {
  font-weight: 600;
  color: var(--text-muted);
}

.go-stats dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
}

.go-result {
  margin-top: 1rem;
  padding: 0.75rem;
  border-radius: 8px;
  background: rgba(14, 165, 233, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.35);
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--text);
}

.go-result.hidden {
  display: none;
}

.go-result-note {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: normal;
}

.go-ended .go-cell {
  cursor: default;
}

@media (max-width: 640px) {
  .go-board {
    --cell-size: min(6.5vmin, 40px);
  }
}