/* reversi: rules used only by the reversi pages (loaded after base.css). */
/* Reversi board: reuses .square from the chess board (same
   float-grid technique) but, unlike checkers, every square looks the
   same - a real Reversi board is a uniform grid, not a checkered one. */
#reversi-board {
  display: block;
  width: 100%;
  max-width: 760px;
  border: 3px solid var(--border);
  background: var(--square-light);
  box-sizing: border-box;
  overflow: hidden;
  margin: 0 auto;
}

.reversi-square {
  background: var(--square-light);
  border: 1px solid var(--border);
}

.reversi-square-movable {
  background: linear-gradient(135deg, var(--text) 0, var(--text) 12px, transparent 12px) var(--square-dark);
}

.reversi-piece {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 78%;
  height: 78%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  box-sizing: border-box;
  pointer-events: none;
}

.reversi-piece-black {
  background: #111;
  border: 2px solid #000;
}

.reversi-piece-white {
  background: #fdfdfd;
  border: 2px solid var(--border);
}

/* Small disc icons for the color-choice picker and board placeholder,
   matching the board's own piece styling. */
.reversi-icon-disc {
  display: inline-block;
  width: 1em;
  height: 1em;
  border-radius: 50%;
  vertical-align: middle;
  box-sizing: border-box;
}

.reversi-icon-disc-black {
  background: #111;
  border: 2px solid #000;
}

.reversi-icon-disc-white {
  background: #fdfdfd;
  border: 2px solid var(--border);
}