@import url('../global.css');

/* =============================================================================
   Checkers — an 8×8 wooden board, red vs charcoal discs. The grid keeps the
   square play-area footprint shared by the other games. Pieces, the selection
   ring, the "movable" hint and the legal-target dots are all toggled by class
   from the JS (CheckersGame.renderState).
   ========================================================================== */

.checkers-board {
  aspect-ratio: 1;
  width: 100%;
  display: grid;
  place-items: center;
  touch-action: manipulation;
}

.checkers-grid {
  width: 100%;
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  border: 4px solid var(--checkers-frame);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.checkers-cell {
  position: relative;
  display: grid;
  place-items: center;
}

.checkers-cell.is-light {
  background: var(--checkers-light);
}

.checkers-cell.is-dark {
  background: var(--checkers-dark);
  cursor: pointer;
}

/* The piece: transparent until a disc sits on the square, then coloured. */
.checkers-piece {
  position: relative;
  width: 76%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: transparent;
  transition: transform 0.12s ease;
  z-index: 1;
}

.checkers-cell.is-p0 .checkers-piece {
  background: radial-gradient(circle at 35% 30%, var(--checkers-p0), var(--checkers-p0-edge));
  box-shadow:
    inset 0 -3px 4px rgba(0, 0, 0, 0.35),
    0 2px 3px rgba(0, 0, 0, 0.3);
}

.checkers-cell.is-p1 .checkers-piece {
  background: radial-gradient(circle at 35% 30%, var(--checkers-p1), var(--checkers-p1-edge));
  box-shadow:
    inset 0 -3px 4px rgba(0, 0, 0, 0.4),
    0 2px 3px rgba(0, 0, 0, 0.35);
}

/* A crowned piece wears a crown glyph. */
.checkers-cell.is-king .checkers-piece::after {
  content: '♛';
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 52%;
  color: var(--checkers-king);
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.45);
}

/* Ring shared by the "you can pick this up" hint and the active selection. */
.checkers-cell.is-movable .checkers-piece::before,
.checkers-cell.is-selected .checkers-piece::before {
  content: '';
  position: absolute;
  inset: -5px;
  border-radius: 50%;
  border: 3px solid var(--checkers-select);
}

.checkers-cell.is-movable .checkers-piece::before {
  opacity: 0.4;
}

.checkers-cell.is-selected .checkers-piece {
  transform: scale(1.06);
}

/* An empty destination the selected piece may move to. */
.checkers-cell.is-target::after {
  content: '';
  position: absolute;
  width: 34%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--checkers-target);
  box-shadow: 0 0 6px var(--checkers-target);
  z-index: 0;
}