/* Chess Board Component — Chess Academy */

.chess-board-wrapper {
  position: relative;
  display: inline-block;
  width: 100%;
  max-width: 560px;
  border: 2px solid rgba(212, 168, 67, 0.3);
  border-radius: 8px;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  background: #2a2015;
}

.chess-board-container {
  position: relative;
  width: 100%;
  padding-bottom: 100%; /* 1:1 aspect ratio */
}

.chess-board-grid {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
}

.chess-square {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0;
}

.chess-square--light {
  background-color: #e8d5b5;
}

.chess-square--dark {
  background-color: #b58863;
}

/* Highlight overlays */
.chess-square--highlight-green::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(34, 197, 94, 0.4);
  pointer-events: none;
  z-index: 1;
}

.chess-square--highlight-red::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(239, 68, 68, 0.4);
  pointer-events: none;
  z-index: 1;
}

.chess-square--highlight-yellow::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(250, 204, 21, 0.35);
  pointer-events: none;
  z-index: 1;
}

.chess-square--highlight-blue::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(59, 130, 246, 0.35);
  pointer-events: none;
  z-index: 1;
}

/* Piece styling */
.chess-piece {
  position: relative;
  z-index: 2;
  line-height: 1;
  text-align: center;
  pointer-events: none;
  text-shadow:
    0 1px 2px rgba(0, 0, 0, 0.3),
    0 0 1px rgba(0, 0, 0, 0.2);
  transition: opacity 0.15s ease;
}

.chess-piece--white {
  color: #fff;
  filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.5));
}

.chess-piece--black {
  color: #1a1a1a;
  filter: drop-shadow(0 1px 1px rgba(255, 255, 255, 0.15));
}

/* Coordinate labels */
.chess-coord {
  position: absolute;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: 600;
  pointer-events: none;
  z-index: 3;
  opacity: 0.55;
}

.chess-coord--file {
  bottom: 1px;
  right: 3px;
  font-size: clamp(7px, 1.4vw, 11px);
}

.chess-coord--rank {
  top: 1px;
  left: 3px;
  font-size: clamp(7px, 1.4vw, 11px);
}

.chess-coord--on-light {
  color: #b58863;
}

.chess-coord--on-dark {
  color: #e8d5b5;
}

/* SVG arrow overlay */
.chess-arrow-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 4;
}

.chess-arrow-line {
  stroke-linecap: round;
}

/* Step-through controls */
.chess-sequence-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 560px;
}

.chess-sequence-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 10px 12px;
  background: #2a2015;
  border: 2px solid rgba(212, 168, 67, 0.3);
  border-top: none;
  border-radius: 0 0 8px 8px;
}

.chess-sequence-wrapper > .chess-board-wrapper {
  border-radius: 8px 8px 0 0;
  border-bottom: none;
}

.chess-seq-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid rgba(212, 168, 67, 0.4);
  border-radius: 6px;
  background: rgba(212, 168, 67, 0.1);
  color: #d4a843;
  font-size: 16px;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
  touch-action: manipulation;
}

.chess-seq-btn:hover:not(:disabled) {
  background: rgba(212, 168, 67, 0.25);
  border-color: rgba(212, 168, 67, 0.6);
}

.chess-seq-btn:active:not(:disabled) {
  background: rgba(212, 168, 67, 0.35);
}

.chess-seq-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.chess-seq-caption {
  flex: 1;
  text-align: center;
  color: #d4a843;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 14px;
  line-height: 1.4;
  min-height: 20px;
  direction: ltr;
}

.chess-seq-counter {
  color: rgba(212, 168, 67, 0.6);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 12px;
  white-space: nowrap;
}