/* ==========================================================================
   CHESS BOARD - PGN rendering and board display
   ========================================================================== */

.chess-board {
    --cell-size: min(40px, 4vw);
    --board-bg: #e5e5e5;
    --light-square: #fff;
    --dark-square: #b5b5b5;
    --chess-border-color: #666;
    --label-color: var(--color-text);

    display: inline-block;
    padding: 0.5rem;
    background: var(--board-bg);
    border: 1px solid var(--chess-border-color);
    border-radius: var(--border-radius-base);
    margin: 1rem 0;
}

[data-theme="dark"] .chess-board {
    --board-bg: #404040;
    --light-square: #808080;
    --dark-square: #404040;
    --chess-border-color: #666;
}

[data-theme="grayscale"] .chess-board {
    --board-bg: #000;
    --light-square: #fff;
    --dark-square: #000;
    --chess-border-color: #000;
}

/* ==========================================================================
   Board Layout
   ========================================================================== */

.chess-rank {
    display: flex;
    align-items: center;
}

.chess-cell {
    width: var(--cell-size);
    height: var(--cell-size);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: calc(var(--cell-size) * 0.8);
    line-height: 1;
}

.chess-cell.light {
    background: var(--light-square);
}

.chess-cell.dark {
    background: var(--dark-square);
}

/* ==========================================================================
   Chess Pieces
   ========================================================================== */

.chess-piece {
    user-select: none;
    font-size: calc(var(--cell-size) * 0.9);
}

.white-piece {
    color: #E3DAC9;
}

.black-piece {
    color: #4A3728;
}

/* ==========================================================================
   Labels and Indicators
   ========================================================================== */

.chess-labels {
    display: flex;
    padding: 0 var(--cell-size);
}

.chess-label {
    width: var(--cell-size);
    height: calc(var(--cell-size) * 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--label-color);
    font-size: calc(var(--cell-size) * 0.4);
    user-select: none;
}

.chess-turn-indicator {
    text-align: center;
    padding: 0.5rem;
    font-size: calc(var(--cell-size) * 0.5);
    color: var(--label-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.turn-symbol {
    font-size: calc(var(--cell-size) * 0.4);
}

.white-to-move .turn-symbol {
    color: #fff;
    text-shadow:
        -1px -1px 0 #000,
         1px -1px 0 #000,
        -1px  1px 0 #000,
         1px  1px 0 #000;
}

.black-to-move .turn-symbol {
    color: #000;
    text-shadow:
        -1px -1px 0 #fff,
         1px -1px 0 #fff,
        -1px  1px 0 #fff,
         1px  1px 0 #fff;
}

[data-theme="dark"] .white-to-move .turn-symbol {
    color: #fff;
    text-shadow:
        -1.5px -1.5px 0 #000,
         1.5px -1.5px 0 #000,
        -1.5px  1.5px 0 #000,
         1.5px  1.5px 0 #000;
}

[data-theme="dark"] .black-to-move .turn-symbol {
    color: #000;
    text-shadow:
        -1.5px -1.5px 0 #fff,
         1.5px -1.5px 0 #fff,
        -1.5px  1.5px 0 #fff,
         1.5px  1.5px 0 #fff;
}

/* ==========================================================================
   PGN and FEN Display
   ========================================================================== */

.invalid-pgn {
    background: var(--board-bg);
    color: var(--label-color);
    padding: 1rem;
    border: 1px solid var(--chess-border-color);
    border-radius: var(--border-radius-base);
    margin: 1rem 0;
    font-family: var(--font-family-mono);
}

.chess-fen {
    margin-top: 0.5rem;
    text-align: center;
}

.fen-toggle {
    background: var(--board-bg);
    color: var(--label-color);
    border: 1px solid var(--chess-border-color);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-base);
    cursor: pointer;
    font-size: calc(var(--cell-size) * 0.4);
    min-height: auto;
}

.fen-toggle:hover {
    background: var(--dark-square);
}

.fen-text {
    margin: 0.5rem 0 0;
    padding: 0.5rem;
    background: var(--board-bg);
    border: 1px solid var(--chess-border-color);
    border-radius: var(--border-radius-base);
    font-family: var(--font-family-mono);
    font-size: calc(var(--cell-size) * 0.4);
}