/* ── Side-by-side pair layout ────────────────────────────────── */

.chess-pair {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 0.5rem 1rem;
    max-width: 1050px;
    margin: 1.5rem auto;
    align-items: end;
}

.chess-pair > .chess3d-bar {
    grid-column: 1 / -1;
}

.chess-pair > [data-chess1d] {
    grid-column: 1 / -1;
}

.chess-pair .chess1d,
.chess-pair .chess2d {
    max-width: none;
    margin: 0 auto;
}

.chess-pair .chess1d-caption,
.chess-pair .chess2d-caption {
    max-width: none;
}

.chess-pair .chess3d-wrap {
    max-width: none;
    margin: 0;
}

@media (max-width: 700px) {
    .chess-pair {
        grid-template-columns: 1fr;
    }
}

/* ── 3-D board ──────────────────────────────────────────────── */

.chess3d-wrap {
    max-width: 600px;
    margin: 1.5rem auto;
}

.chess3d-cv {
    position: relative;
    width: 100%;
    border-radius: 4px;
    overflow: hidden;
}

.chess3d-layers {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 8px 6px;
    border-radius: 4px;
    z-index: 1;
}

.chess3d-layer-bar {
    width: 22px;
    height: 4px;
    background: rgba(139, 115, 85, 0.3);
    border-radius: 2px;
    cursor: pointer;
    transition: background 0.15s;
}

.chess3d-layer-bar:hover {
    background: rgba(139, 115, 85, 0.85);
}

.chess3d-layer-bar.active {
    background: rgba(139, 115, 85, 0.95);
}

.chess3d-layer-bar--moves {
    width: 22px;
    height: 10px;
    background: rgba(136, 184, 176, 0.35);
    margin-bottom: 4px;
}

.chess3d-layer-bar--moves:hover,
.chess3d-layer-bar--moves.active {
    background: rgba(136, 184, 176, 0.95);
}

.chess3d-layer-indicator {
    position: absolute;
    left: -6px;
    width: 0;
    height: 0;
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    border-left: 5px solid rgba(139, 115, 85, 0.6);
    transform: translateY(-50%);
    transition: top 0.15s ease;
    pointer-events: none;
}

.chess3d-cv canvas {
    display: block;
}

.chess3d-bar {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.chess3d-btn {
    padding: 0.35rem 0.85rem;
    border: 1.5px solid #8b7355;
    border-radius: 4px;
    background: transparent;
    color: var(--text-a, #4c4f69);
    font-family: inherit;
    font-size: 0.85rem;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

.chess3d-btn:hover {
    background: rgba(139, 115, 85, 0.1);
}

.chess3d-btn.active {
    background: #8b7355;
    color: #fff;
}

.chess3d-btn.playing {
    background: #8b7355;
    color: #fff;
}

.chess3d-cap {
    text-align: center;
    color: var(--subtext-a, #6c6f85);
    font-size: 0.88rem;
    margin: 0.4rem auto 1.5rem;
}