/**
 * ugrad-go-board-theme.css — Go lab board palette (black/grey field, blue hover, white/black pieces).
 * Link after quantum-theme.css on μgrad game surfaces.
 */
:root {
  --ugb-page: #0a0d12;
  --ugb-panel: rgba(0, 0, 0, 0.22);
  --ugb-line: rgba(250, 250, 252, 0.1);
  /* Cool neutral greys (no brown/olive cast) — matches Go lab field + chess/checkers 8×8 */
  --ugb-cell-light: #2a3038;
  --ugb-cell-dark: #12161c;
  --ugb-hover: rgba(56, 139, 253, 0.28);
  --ugb-hover-ring: #58a6ff;
  --ugb-piece-w: #f0f2f5;
  --ugb-piece-b: #0d0d0d;
  --ugb-accent: #58a6ff;
}
[data-theme='light'] {
  --ugb-page: #f0f2f5;
  --ugb-panel: rgba(255, 255, 255, 0.85);
  --ugb-line: rgba(31, 35, 40, 0.15);
  --ugb-cell-light: #f4f6f9;
  --ugb-cell-dark: #dce1e8;
  --ugb-hover: rgba(9, 105, 218, 0.18);
  --ugb-hover-ring: #0969da;
  --ugb-piece-w: #ffffff;
  --ugb-piece-b: #24292f;
}

.ugb-surface {
  background: var(--ugb-page) !important;
}
.ugb-board-wrap {
  border-color: var(--ugb-line) !important;
  background: var(--ugb-panel) !important;
}

/* Chess / checkers 8×8: --ugb-cell-* = cool neutral greys (aligned with Go lab, not wood tones). */