/* ======================================================= checkers cabinet
   Its own art direction: a cream-and-walnut board that ignores the active
   world, because a board game needs stable, readable colours.
   ===================================================================== */
.ck {
  --board: min(80vw, 58vh, 520px);
  --light: #efdfc0;
  --dark: #7a4a32;
  --edge: #3d2318;
  --black-piece: #27272c;
  --black-rim: #4e4e58;
  --red-piece: #c0392b;
  --red-rim: #e8705c;
  --pick: #ffd24a;
  --go: #6ddf8e;

  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(0.6rem, 2vh, 1rem);
  width: 100%;
}

.ck__layout {
  display: flex;
  gap: clamp(0.8rem, 2vw, 1.4rem);
  align-items: flex-start;
  justify-content: center;
  flex-wrap: wrap;
  width: 100%;
}

/* ================================================================== board */
.ck__frame {
  position: relative;
  padding: clamp(8px, 1.6vw, 15px);
  border-radius: 8px;
  background: linear-gradient(160deg, #6b4028, #3d2318 65%, #52301d);
  box-shadow:
    inset 0 2px 0 rgba(255, 255, 255, .13),
    inset 0 -3px 8px rgba(0, 0, 0, .6),
    0 26px 60px -26px rgba(0, 0, 0, .95);
}

.ck__board {
  position: relative;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  width: var(--board);
  height: var(--board);
  border-radius: 3px;
  overflow: hidden;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, .55);
}
.ck__board.is-flipped { transform: rotate(180deg); }
.ck__board.is-flipped .ck__piece,
.ck__board.is-flipped .ck__coord { transform: rotate(180deg); }

.ck__sq {
  position: relative;
  display: grid;
  place-items: center;
  border: 0;
  padding: 0;
  background: var(--light);
  cursor: default;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.ck__sq--dark { background: var(--dark); cursor: pointer; }
/* a faint grain so the wood is not flat */
.ck__sq--dark::after {
  content: '';
  position: absolute; inset: 0;
  opacity: .22;
  pointer-events: none;
  background: repeating-linear-gradient(96deg, transparent 0 4px, rgba(0, 0, 0, .25) 4px 5px, transparent 5px 11px);
}

.ck__sq:focus-visible { outline: 3px solid var(--pick); outline-offset: -3px; z-index: 4; }

.ck__coord {
  position: absolute;
  left: 3px; top: 2px;
  font-family: var(--mono);
  font-size: clamp(6px, 1.1vw, 9px);
  color: rgba(255, 255, 255, .3);
  pointer-events: none;
}

/* last move, and the square you picked up from */
.ck__sq.is-last::before {
  content: '';
  position: absolute; inset: 0;
  background: rgba(255, 210, 74, .22);
}
.ck__sq.is-selected::before {
  content: '';
  position: absolute; inset: 0;
  box-shadow: inset 0 0 0 3px var(--pick);
}

/* where you may go */
.ck__dot {
  position: absolute;
  width: 26%; height: 26%;
  border-radius: 50%;
  background: var(--go);
  box-shadow: 0 0 12px rgba(109, 223, 142, .8);
  opacity: .85;
  pointer-events: none;
  animation: ck-pop .25s var(--ease-spring);
}
.ck__dot--capture {
  width: 76%; height: 76%;
  background: transparent;
  border: 4px solid #ff6b5e;
  box-shadow: 0 0 16px rgba(255, 107, 94, .7), inset 0 0 14px rgba(255, 107, 94, .45);
}
@keyframes ck-pop { from { transform: scale(.2); opacity: 0; } }

/* ================================================================= pieces */
.ck__piece {
  position: relative;
  width: 78%;
  height: 78%;
  border-radius: 50%;
  display: grid;
  place-items: center;
  pointer-events: none;
  transition: transform .22s var(--ease-out), filter .2s var(--ease-out);
  animation: ck-place .3s var(--ease-spring);
}
@keyframes ck-place { from { transform: scale(.55); opacity: .3; } }

.ck__piece--b {
  background: radial-gradient(circle at 34% 28%, #5c5c68 0%, var(--black-piece) 58%, #141418 100%);
  box-shadow: 0 3px 7px rgba(0, 0, 0, .66), inset 0 0 0 2px var(--black-rim), inset 0 -4px 8px rgba(0, 0, 0, .5);
}
.ck__piece--r {
  background: radial-gradient(circle at 34% 28%, #ef8a78 0%, var(--red-piece) 58%, #78180f 100%);
  box-shadow: 0 3px 7px rgba(0, 0, 0, .6), inset 0 0 0 2px var(--red-rim), inset 0 -4px 8px rgba(0, 0, 0, .42);
}
/* the moulded ring every real checker has */
.ck__piece::after {
  content: '';
  position: absolute;
  inset: 17%;
  border-radius: 50%;
  border: 1.5px solid rgba(255, 255, 255, .16);
  box-shadow: inset 0 0 6px rgba(0, 0, 0, .35);
}
.ck__sq--dark:hover .ck__piece.is-mine { transform: translateY(-2px) scale(1.04); }

.ck__crown {
  position: relative;
  z-index: 2;
  width: 48%;
  filter: drop-shadow(0 1px 1px rgba(0, 0, 0, .6));
}
.ck__crown path { fill: #ffd24a; }

.ck__piece.is-captured { animation: ck-capture .34s var(--ease-out) forwards; }
@keyframes ck-capture {
  to { transform: scale(.2) rotate(40deg); opacity: 0; }
}

/* ================================================================== aside */
.ck__aside {
  width: min(230px, 92vw);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.ck__tray {
  padding: 0.5rem 0.7rem;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, .3);
  border: 1px solid var(--mist);
}
.ck__tray-label {
  font-size: 0.56rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.ck__tray-pieces { display: flex; flex-wrap: wrap; gap: 3px; margin-top: 0.3rem; min-height: 16px; }
.ck__chip { width: 14px; height: 14px; border-radius: 50%; }
.ck__chip--b { background: radial-gradient(circle at 34% 28%, #5c5c68, #27272c 70%); border: 1px solid #4e4e58; }
.ck__chip--r { background: radial-gradient(circle at 34% 28%, #ef8a78, #c0392b 70%); border: 1px solid #e8705c; }

.ck__log {
  flex: 1;
  max-height: 240px;
  overflow-y: auto;
  padding: 0.5rem 0.7rem;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, .3);
  border: 1px solid var(--mist);
  font-family: var(--mono);
  font-size: 0.7rem;
  line-height: 1.6;
  scrollbar-width: thin;
}
.ck__log-row { display: flex; gap: 0.5rem; }
.ck__log-no { color: var(--ink-faint); min-width: 2em; }
.ck__log-b { color: #cfd2da; min-width: 4.2em; }
.ck__log-r { color: #f0a090; }
.ck__log-row.is-latest { background: rgba(255, 210, 74, .12); }

.ck__thinking {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  min-height: 1.2em;
}
.ck__thinking i {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--pick);
  animation: ck-blink 1s ease-in-out infinite;
}
@keyframes ck-blink { 50% { opacity: .15; } }

@media (max-width: 760px) {
  .ck { --board: min(92vw, 52vh, 460px); }
  .ck__aside { width: min(100%, 460px); flex-direction: row; flex-wrap: wrap; }
  .ck__log { max-height: 120px; width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  .ck__piece, .ck__dot { animation: none; }
}