/** Colored board squares — 浅木色 */
cg-board {
  background-color: #F0D9B5;
  background-image: url('data:image/svg+xml;base64,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');
}
cg-board square.move-dest { background: radial-gradient(rgba(20, 85, 30, 0.5) 22%, #208530 0, rgba(0, 0, 0, 0.3) 0, rgba(0, 0, 0, 0) 0); }
cg-board square.premove-dest { background: radial-gradient(rgba(20, 30, 85, 0.5) 22%, #203085 0, rgba(0, 0, 0, 0.3) 0, rgba(0, 0, 0, 0) 0); }
cg-board square.oc.move-dest { background: radial-gradient(transparent 0%, transparent 80%, rgba(20, 85, 0, 0.3) 80%); }
cg-board square.oc.premove-dest { background: radial-gradient(transparent 0%, transparent 80%, rgba(20, 30, 85, 0.2) 80%); }
cg-board square.move-dest:hover, cg-board square.move-dest.hover { background: rgba(20, 85, 30, 0.3); }
cg-board square.premove-dest:hover, cg-board square.premove-dest.hover { background: rgba(20, 30, 85, 0.2); }
cg-board square.last-move { background-color: rgba(155, 199, 0, 0.41); }
cg-board square.selected { background-color: rgba(20, 85, 30, 0.5); }
cg-board square.check { background: radial-gradient(ellipse at center, rgba(255, 0, 0, 1) 0%, rgba(231, 0, 0, 1) 25%, rgba(169, 0, 0, 0) 89%, rgba(158, 0, 0, 0) 100%); }
cg-board square.current-premove { background-color: rgba(20, 30, 85, 0.5); }