:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100vh;background:#0a0a0a;color:#fafafa}.shell{min-height:100vh;display:grid;place-items:center;padding:1.5rem}.chess-container{display:flex;flex-direction:column;align-items:center;gap:.75rem;width:100%;max-width:520px}.chess-header{display:flex;align-items:center;justify-content:space-between;width:100%;padding:0 .25rem}.chess-header h1{margin:0;font-size:1.4rem;font-weight:700;letter-spacing:-.02em}.turn-indicator{display:flex;align-items:center;gap:.5rem;font-size:.85rem;color:#ffffffbf}.turn-dot{width:10px;height:10px;border-radius:50%;border:1px solid rgba(255,255,255,.3)}.turn-dot.white{background:#fff}.turn-dot.black{background:#333}.board-wrapper{display:flex;align-items:center;gap:.4rem}.board-labels{display:flex;font-size:.65rem;color:#fff6;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.board-labels-left,.board-labels-right{flex-direction:column;gap:0;height:min(calc(100vw - 8rem),440px);justify-content:space-between}.board-labels-left span,.board-labels-right span{display:flex;align-items:center;justify-content:center;flex:1}.board-labels-bottom{flex-direction:row;width:min(calc(100vw - 8rem),440px);justify-content:space-around;padding:0 .1rem}.board-labels-bottom span{display:flex;justify-content:center;width:12.5%}.board{display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);width:min(calc(100vw - 8rem),440px);height:min(calc(100vw - 8rem),440px);border:2px solid rgba(255,255,255,.15);border-radius:4px;overflow:hidden}.square{position:relative;display:flex;align-items:center;justify-content:center;cursor:pointer;-webkit-user-select:none;user-select:none;transition:background .1s}.square.light{background:#e8d5b5}.square.dark{background:#b58863}.square.selected{background:#f6f669!important}.square.last-move.light{background:#f0e4a8}.square.last-move.dark{background:#c9b36e}.square.in-check{background:radial-gradient(ellipse at center,red,#e70000 25%,#a9000000 89%,#9e000000)!important}.piece{font-size:min(calc((100vw - 8rem) / 9),48px);line-height:1;z-index:1;pointer-events:none;filter:drop-shadow(0 1px 2px rgba(0,0,0,.4))}.piece.white{filter:drop-shadow(0 1px 2px rgba(0,0,0,.5))}.piece.black{filter:drop-shadow(0 1px 2px rgba(0,0,0,.3))}.move-dot{position:absolute;width:28%;height:28%;border-radius:50%;background:#0003;pointer-events:none;z-index:2}.capture-dot{position:absolute;width:85%;height:85%;border-radius:50%;border:5px solid rgba(0,0,0,.2);pointer-events:none;z-index:2;background:transparent}.promotion-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;display:grid;place-items:center;z-index:100}.promotion-dialog{background:#1a1a2e;border:1px solid rgba(255,255,255,.15);border-radius:12px;padding:1.5rem;text-align:center}.promotion-dialog h3{margin:0 0 1rem;font-size:1rem;font-weight:600}.promotion-options{display:flex;gap:.5rem}.promotion-btn{display:flex;flex-direction:column;align-items:center;gap:.25rem;padding:.75rem 1rem;background:#ffffff0d;border:1px solid rgba(255,255,255,.12);border-radius:8px;cursor:pointer;transition:background .15s;color:#fafafa}.promotion-btn:hover{background:#ffffff1f}.promotion-btn .piece{font-size:2.5rem}.promotion-label{font-size:.7rem;text-transform:capitalize;color:#fff9}.game-actions{width:100%;display:flex;justify-content:center}.btn-new-game{padding:.5rem 1.25rem;background:#ffffff0f;border:1px solid rgba(255,255,255,.12);border-radius:6px;color:#ffffffbf;font-size:.8rem;cursor:pointer;transition:background .15s}.btn-new-game:hover{background:#ffffff1a}.move-history{width:100%;max-height:140px;overflow-y:auto;background:#ffffff08;border:1px solid rgba(255,255,255,.08);border-radius:8px;padding:.75rem}.move-history h3{margin:0 0 .5rem;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:#ffffff73}.moves-list{display:flex;flex-wrap:wrap;gap:.25rem .75rem;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.75rem}.move-pair{display:flex;gap:.4rem;align-items:center}.move-number{color:#ffffff59;min-width:1.5rem}.move-text{color:#ffffffb3}