/* Brown board and unmodified Cburnett SVGs: familiar Lichess-style presentation. */
.board-mount{width:100%;aspect-ratio:1;min-width:0}
.arena-board{position:relative;width:100%;aspect-ratio:1;overflow:hidden;border-radius:3px;box-shadow:0 2px 6px #0003;user-select:none;-webkit-user-select:none;touch-action:pan-y;isolation:isolate;contain:layout paint}
.arena-square{position:absolute;top:0;left:0;width:12.5%;height:12.5%;padding:0;border:0;border-radius:0;opacity:1!important;transition:none!important;cursor:default}
.arena-light{background:#f0d9b5;color:#946f51}.arena-dark{background:#b58863;color:#f0d9b5}
.arena-piece,.arena-drag-piece{position:absolute;top:0;left:0;width:12.5%;height:12.5%;object-fit:contain;padding:0;pointer-events:none;z-index:2;filter:none;transition:transform 220ms cubic-bezier(.2,.75,.3,1);will-change:transform}
.arena-piece.no-animation{transition:none}.arena-drag-piece{z-index:10;transition:none;filter:drop-shadow(0 5px 3px #0003)}
.board-interactive{touch-action:none}.board-interactive .arena-square{cursor:pointer}.board-dragging,.board-dragging .arena-square{cursor:grabbing}
.arena-rank,.arena-file{position:absolute;font-size:clamp(9px,1.15vw,13px);font-weight:650;line-height:1;z-index:3;pointer-events:none}.arena-rank{top:4px;left:4px}.arena-file{bottom:3px;right:4px}
.arena-square.board-last-move{background:#cdd26a}.arena-dark.board-last-move{background:#aaa23b}
.arena-square.board-selected{background:#a7ae61}.arena-dark.board-selected{background:#829769}
.arena-square.board-target:after{content:'';position:absolute;width:27%;height:27%;left:36.5%;top:36.5%;border-radius:50%;background:#142a2533}
.arena-square.board-capture:after{width:90%;height:90%;left:5%;top:5%;background:none;border:5px solid #142a2533;box-sizing:border-box}
.arena-square:focus-visible{outline:3px solid #267e9b;outline-offset:-3px;z-index:4}
.promotion-picker .promotion-piece{width:46px;height:46px}.promotion-picker .button{padding:7px;min-width:58px;min-height:58px}
.board-help{min-height:20px}.board-credit{display:block;text-align:center;color:var(--muted);font-size:10px;margin-top:8px}
@media(prefers-reduced-motion:reduce){.arena-piece{transition:none}}