/* =========================================================
   chess.css — Chess project specific styles
   Inherits all base styles from styles.css
========================================================= */

/* =========================================================
   TOOLBAR (mode buttons + inner tabs)
========================================================= */
.chess-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1.25rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  gap: 1rem;
}

.mode-group {
  display: flex;
  gap: 0.4rem;
}

.inner-tabs {
  display: flex;
  gap: 0;
}

.inner-tab {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  cursor: pointer;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 0.35rem 0.85rem;
  transition: all 0.15s;
}
.inner-tab:first-child { border-radius: var(--radius) 0 0 var(--radius); }
.inner-tab:last-child  { border-radius: 0 var(--radius) var(--radius) 0; border-left: none; }
.inner-tab.active      { background: var(--border); color: var(--text); }
.inner-tab:hover:not(.active) { color: var(--text); }

/* =========================================================
   INNER PANELS (Board / Weights)
========================================================= */
.inner-panel {
  display: none;
  flex: 1;
  overflow: visible;
  min-height: 0;
}
.inner-panel.active { display: flex; flex-direction: column; }

/* =========================================================
   BOARD AREA
========================================================= */
.board-area {
  display: flex;
  gap: 1rem;
  padding: 1rem;
  flex: 1;
  min-height: 0;
  align-items: flex-start;
}

.board-wrap {
  flex-shrink: 0;
}

.chess-board {
  display: grid;
  grid-template-columns: repeat(8, 52px);
  grid-template-rows: repeat(8, 52px);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  user-select: none;
}

.chess-cell {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  cursor: pointer;
  position: relative;
  transition: background 0.1s;
}

/* Light and dark squares */
.chess-cell.light { background: var(--chess-square-light); }
.chess-cell.dark  { background: var(--chess-square-dark); }

/* Highlighted states */
.chess-cell.selected   { background: var(--chess-square-selected) !important; }
.chess-cell.legal-move { background: var(--chess-square-legal) !important; }
.chess-cell.last-move  { background: var(--chess-square-last) !important; }
.chess-cell.in-check   { background: var(--chess-square-check) !important; }

/* Dot overlay for legal moves on empty squares */
.chess-cell.legal-move::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--chess-legal-dot);
}

/* Rank/file coordinate labels */
.chess-cell .coord {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 0.55rem;
  font-weight: 700;
  opacity: 0.6;
  pointer-events: none;
}
.chess-cell .coord-rank { bottom: 2px; right: 4px; }
.chess-cell .coord-file { top: 2px; left: 4px; }

/* =========================================================
   BOARD SIDE PANEL (captures, status, win tracker)
========================================================= */
.board-side {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 130px;
}

.captured-section { display: flex; flex-direction: column; gap: 0.3rem; }

.cap-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.captured-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  font-size: 1.1rem;
  min-height: 1.4rem;
}

.status-box {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  padding: 0.5rem 0.75rem;
  background: var(--inset);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-height: 2.5rem;
  display: flex;
  align-items: center;
}

.win-tracker {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

.win-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.win-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--muted);
}

.win-val {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
}

/* =========================================================
   WEIGHTS PANEL
========================================================= */
.weights-panel {
  padding: 1rem 1.25rem;
  overflow: visible;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.weights-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Piece value row grid */
.piece-value-grid {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.pv-side-block {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.weights-side-label {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.pv-side-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pv-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  background: var(--inset);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.4rem 0.6rem;
  min-width: 60px;
}

.pv-symbol {
  font-size: 1.4rem;
  line-height: 1;
}

.pv-name {
  font-family: var(--font-mono);
  font-size: 0.55rem;
  color: var(--muted);
  text-transform: uppercase;
}

.pv-input {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  width: 54px;
  text-align: center;
  padding: 0.1rem 0;
}
.pv-input:focus { outline: none; border-bottom-color: var(--accent); }

/* PST piece selector */
.pst-select {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  background: var(--inset);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.3rem 0.5rem;
  border-radius: var(--radius);
  cursor: pointer;
}
.pst-select:focus { outline: none; border-color: var(--accent); }

/* PST split layout + 8x8 grids */
.pst-grid-wrap {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.pst-side-section {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 0;
}

.pst-side-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 2px;
}

.pst-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 32px;
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.15s;
}

.pst-input {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 700;
  background: transparent;
  border: none;
  width: 100%;
  text-align: center;
  color: var(--text);
}
.pst-input:focus { outline: none; }

@media (max-width: 900px) {
  .pst-grid-wrap {
    grid-template-columns: 1fr;
  }
}

/* =========================================================
   MISC
========================================================= */
.depth-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.pop-input {
  width: 48px;
}

/* =========================================================
   COLOUR PICKER OVERLAY
   Shown before each Human vs Bot game so the player can
   choose to play White or Black.
========================================================= */
.colour-picker {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  padding: 2.5rem 1rem;
  flex: 1;
}

.colour-picker-title {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}

.colour-picker-btns {
  display: flex;
  gap: 1.5rem;
}

.colour-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  padding: 1.5rem 2rem;
  background: var(--inset);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  min-width: 110px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
}

.colour-btn:hover {
  border-color: var(--accent);
  background: var(--chess-picker-hover);
  opacity: 1;
}

.colour-piece {
  font-size: 2.8rem;
  line-height: 1;
  display: block;
}

.colour-sub {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--muted);
  font-weight: 400;
}