/** Colored board squares as an embedded SVG */
cg-board {
  background-color: #f0d9b5;
  background-image: url("images/board/blue2.svg");
}

/** 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);
}