.chess-app{display:flex;flex-direction:column;align-items:center;gap:1rem}.chess-app h1{margin:0;font-size:1.8rem;font-weight:600;letter-spacing:.05em}.status{display:flex;align-items:center;gap:.5rem;font-size:1.1rem;padding:.4rem 1rem;border-radius:8px;background:#ffffff0f}.status.check{background:#ef444426;color:#fca5a5}.status.game-over{background:#22c55e26;color:#86efac;font-weight:600}.turn-dot{width:12px;height:12px;border-radius:50%;border:2px solid rgba(255,255,255,.3)}.turn-dot[data-color=White]{background:#fff}.turn-dot[data-color=Black]{background:#1a1a1a}.board{display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);width:min(480px,90vw);height:min(480px,90vw);border:3px solid rgba(255,255,255,.15);border-radius:4px;overflow:hidden;box-shadow:0 8px 32px #0006}.square{position:relative;display:flex;align-items:center;justify-content:center;cursor:pointer;-webkit-user-select:none;user-select:none;transition:background-color .1s}.square.light{background:#f0d9b5}.square.dark{background:#b58863}.square.selected.light{background:#f7ec5a}.square.selected.dark{background:#daca34}.square.in-check.light,.square.in-check.dark{background:radial-gradient(ellipse at center,#ff3333 0%,#e60000 40%,transparent 70%)}.square.last-move.light{background:#cdd26a}.square.last-move.dark{background:#aaa23a}.square.selected.last-move.light{background:#f7ec5a}.square.selected.last-move.dark{background:#daca34}.piece{font-size:min(3.2rem,9vw);line-height:1;pointer-events:none}.piece.white{color:#fff;filter:drop-shadow(0 1px 2px rgba(0,0,0,.5))}.piece.black{color:#000;filter:drop-shadow(0 1px 2px rgba(0,0,0,.3))}.legal-dot{width:28%;height:28%;border-radius:50%;background:#0003;pointer-events:none}.legal-capture{position:absolute;top:0;right:0;bottom:0;left:0;border-radius:50%;border:5px solid rgba(0,0,0,.2);pointer-events:none;box-sizing:border-box}.promotion-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:100}.promotion-dialog{background:#2a2a2a;border-radius:12px;padding:1.5rem;text-align:center;box-shadow:0 12px 40px #00000080}.promotion-dialog p{margin:0 0 1rem;font-size:1.1rem}.promotion-choices{display:flex;gap:.75rem}.promotion-btn{font-size:2.5rem;padding:.5rem .75rem;background:#ffffff14;border:2px solid rgba(255,255,255,.15);border-radius:8px;cursor:pointer;transition:background .15s,transform .1s;line-height:1}.promotion-btn:hover{background:#ffffff26;transform:scale(1.1)}.new-game-btn{margin-top:.5rem;padding:.6rem 1.5rem;font-size:1rem;font-weight:600;background:#4f46e5;color:#fff;border:none;border-radius:8px;cursor:pointer;transition:background .15s}.new-game-btn:hover{background:#4338ca}:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}#root{max-width:1280px;margin:0 auto;padding:2rem;text-align:center}