/** Colored board squares as an embedded SVG */
cg-board {
  background-color: #f0d9b5;
  background-image: url('data:image/svg+xml;base64,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');
}

/** Interactive board square colors */
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 {
  background: rgba(20, 85, 30, 0.3);
}
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);
}

/** Alternating colors in rank/file/square labels */
.orientation-white .ranks :nth-child(odd),
.orientation-white .files :nth-child(even),
.orientation-black .ranks :nth-child(even),
.orientation-black .files :nth-child(odd),
coords.squares:nth-of-type(odd) :nth-child(even),
coords.squares:nth-of-type(even) :nth-child(odd) {
  color: rgba(72, 72, 72, 0.8);
}

.orientation-white .ranks :nth-child(even),
.orientation-white .files :nth-child(odd),
.orientation-black .ranks :nth-child(odd),
.orientation-black .files :nth-child(even),
coords.squares:nth-of-type(odd) :nth-child(odd),
coords.squares:nth-of-type(even) :nth-child(even) {
  color: rgba(255, 255, 255, 0.8);
}