/* Board Container */
.board {
  --tile-size: clamp(36px, 4.2vw, 62px);
  --tile-gap: clamp(3px, 0.3vw, 5px);

  position: relative;
  background: #1A1A1A;
  border-radius: 16px;
  padding: 28px 48px 40px;
  width: 100%;
  box-shadow:
    0 -4px 20px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

/* Tile Grid */
.tile-grid {
  display: grid;
  grid-template-columns: repeat(var(--grid-cols, 22), var(--tile-size));
  grid-template-rows: repeat(var(--grid-rows, 5), var(--tile-size));
  gap: var(--tile-gap);
  justify-content: center;
}

/* Accent Squares — small stacked blocks in top corners */
.accent-bar {
  position: absolute;
  top: 30px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  z-index: 5;
}

.accent-bar-left {
  left: 18px;
}

.accent-bar-right {
  right: 18px;
}

.accent-segment {
  width: 14px;
  height: 14px;
  border-radius: 2px;
  transition: background-color 0.5s ease;
}

/* Keyboard Shortcut Indicator */
.keyboard-hint {
  position: absolute;
  bottom: 12px;
  left: 16px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.35);
  cursor: pointer;
  transition: background 0.2s;
}

.keyboard-hint:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* Shortcuts Overlay */
.shortcuts-overlay {
  display: none;
  position: absolute;
  bottom: 48px;
  left: 16px;
  background: rgba(0, 0, 0, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.7);
  z-index: 10;
  min-width: 180px;
}

.shortcuts-overlay.visible {
  display: block;
}

.shortcuts-overlay div {
  display: flex;
  justify-content: space-between;
  padding: 4px 0;
}

.shortcuts-overlay kbd {
  background: rgba(255, 255, 255, 0.1);
  padding: 1px 6px;
  border-radius: 3px;
  font-family: inherit;
  font-size: 11px;
  margin-left: 16px;
}

/* Scroll indicator at bottom of board */
.board::after {
  content: '';
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 4px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.15);
}