/* Tic-tac-toe board — site tokens (light paper chrome). */
.ttt {
  --ttt-line: color-mix(in srgb, var(--guld-ink, #353e55) 28%, transparent);
  --ttt-cell: var(--guld-white, #ffffff);
  --ttt-mark: var(--guld-ink, #353e55);
  --ttt-accent: var(--guld-navy, #264175);
  --ttt-muted: color-mix(in srgb, var(--guld-ink, #353e55) 62%, transparent);
  max-width: 28rem;
}

.ttt__board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.35rem;
  margin: 1.25rem 0;
  aspect-ratio: 1;
}

.ttt__cell {
  appearance: none;
  border: 2px solid var(--ttt-line);
  border-radius: 0.35rem;
  background: var(--ttt-cell);
  color: var(--ttt-mark);
  font-family: var(--font-display, var(--font-mono, ui-monospace, monospace));
  font-size: clamp(2rem, 9vw, 3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  cursor: pointer;
  min-height: 4.5rem;
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--guld-ink, #353e55) 6%, transparent);
}

.ttt__cell:hover:not(:disabled) {
  border-color: var(--ttt-accent);
  color: var(--ttt-accent);
}

.ttt__cell:disabled {
  cursor: default;
  opacity: 1;
  color: var(--ttt-mark);
}

.ttt__meta {
  font-size: 0.95rem;
  color: var(--ttt-muted);
  display: grid;
  gap: 0.35rem;
}

.ttt__meta code {
  color: var(--ttt-mark);
  word-break: break-all;
}

.ttt__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.ttt__panel {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--ttt-line);
}

.ttt__panel label {
  display: block;
  font-size: 0.85rem;
  color: var(--ttt-muted);
  margin-bottom: 0.25rem;
}

.ttt__panel input,
.ttt__panel textarea,
.ttt__panel select {
  width: 100%;
  margin-bottom: 0.75rem;
  font-family: var(--font-mono, ui-monospace, monospace);
  font-size: 0.85rem;
  color: var(--ttt-mark);
  background: var(--ttt-cell);
  border: 1px solid var(--ttt-line);
  border-radius: 0.25rem;
  padding: 0.4rem 0.55rem;
}

.ttt__panel label:has([data-ttt-chain]) {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--ttt-mark);
  margin-bottom: 0.85rem;
}

.ttt__panel label:has([data-ttt-chain]) input {
  width: auto;
  margin: 0;
}

.ttt__hint {
  font-size: 0.9rem;
  color: var(--ttt-muted);
  margin: 0.5rem 0 0;
}

.ttt__advanced {
  margin-top: 1.75rem;
  padding-top: 0.25rem;
  border-top: 1px solid var(--ttt-line);
}

.ttt__advanced > summary {
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ttt-muted);
  list-style: none;
}

.ttt__advanced > summary::-webkit-details-marker {
  display: none;
}

.ttt__advanced > summary::before {
  content: "▸ ";
  color: var(--ttt-accent);
}

.ttt__advanced[open] > summary::before {
  content: "▾ ";
}

.ttt__advanced .ttt__panel {
  margin-top: 0.85rem;
  padding-top: 0;
  border-top: none;
}