: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:#1a1a2e;color:#fafafa}.chess-app{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:1rem;gap:.75rem}.chess-title{margin:0;font-size:1.75rem;font-weight:700;letter-spacing:-.02em;color:#e0e0e0}.chess-container{display:flex;flex-direction:column;gap:.25rem}.captured-row{display:flex;align-items:center;gap:.5rem;min-height:1.75rem;padding:0 2.5rem}.captured-pieces{display:flex;flex-wrap:wrap;gap:0}.captured-piece{font-size:1rem;opacity:.7;margin-right:-.2rem}.score{font-size:.8rem;font-weight:600;color:#aaa}.board-wrapper{display:flex;align-items:stretch;gap:.25rem}.rank-labels{display:flex;flex-direction:column}.rank-label{flex:1;display:flex;align-items:center;justify-content:center;font-size:.7rem;color:#666;width:1.25rem;min-height:min(70px,10vw)}.file-labels{display:flex;margin-left:1.5rem}.file-label{flex:1;display:flex;align-items:center;justify-content:center;font-size:.7rem;color:#666;width:min(70px,10vw);height:1.25rem}.board{display:grid;grid-template-columns:repeat(8,min(70px,10vw));grid-template-rows:repeat(8,min(70px,10vw));border:2px solid #333;border-radius:4px;overflow:hidden}.square{display:flex;align-items:center;justify-content:center;position:relative;cursor:pointer;-webkit-user-select:none;user-select:none;transition:background-color .1s}.square.light{background-color:#e8d5b5}.square.dark{background-color:#b58863}.square.selected{background-color:#f6f669!important}.square.last-move{background-color:#ffff004d}.square.light.last-move{background-color:khaki}.square.dark.last-move{background-color:#baca44}.square.in-check{background:radial-gradient(ellipse at center,rgba(255,0,0,.8) 0%,rgba(255,0,0,.4) 40%,transparent 70%)}.square.valid-capture{background:radial-gradient(transparent 50%,#0003 50%)}.square.valid-move{cursor:pointer}.piece{font-size:min(50px,7.5vw);line-height:1;z-index:1;filter:drop-shadow(1px 1px 2px rgba(0,0,0,.3))}.piece.white{color:#fff;text-shadow:0 0 3px rgba(0,0,0,.5)}.piece.black{color:#111;text-shadow:0 0 3px rgba(255,255,255,.2)}.move-dot{width:25%;height:25%;border-radius:50%;background-color:#00000040;pointer-events:none}.capture-ring{position:absolute;top:4px;right:4px;bottom:4px;left:4px;border-radius:50%;border:4px solid rgba(0,0,0,.25);pointer-events:none}.status{font-size:1.1rem;font-weight:600;padding:.5rem 1.25rem;border-radius:.5rem;background:#ffffff0d;border:1px solid rgba(255,255,255,.1)}.status.check,.status.checkmate{color:#ff6b6b;border-color:#ff6b6b4d;background:#ff6b6b1a}.status.stalemate{color:#ffd93d;border-color:#ffd93d4d;background:#ffd93d1a}.new-game-btn{padding:.6rem 1.5rem;font-size:.95rem;font-weight:600;border:none;border-radius:.5rem;background:#4a6fa5;color:#fff;cursor:pointer;transition:background .15s}.new-game-btn:hover{background:#5a85c0}.promotion-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000b3;display:flex;align-items:center;justify-content:center;z-index:100}.promotion-dialog{background:#2a2a3e;border:1px solid #444;border-radius:.75rem;padding:1.5rem;text-align:center}.promotion-dialog p{margin:0 0 1rem;font-size:1rem;color:#ccc}.promotion-options{display:flex;gap:.5rem}.promotion-btn{width:64px;height:64px;display:flex;align-items:center;justify-content:center;background:#3a3a50;border:2px solid #555;border-radius:.5rem;cursor:pointer;transition:all .15s}.promotion-btn:hover{background:#4a4a65;border-color:#888}.promotion-btn .piece{font-size:2.5rem}