.chess-layout{display:grid;grid-template-columns:minmax(0,540px) minmax(240px,1fr);gap:48px;max-width:1000px}.chess-board{display:grid;grid-template-columns:repeat(8,1fr);width:100%;aspect-ratio:1;border:1px solid #425251;border-radius:8px;overflow:hidden}.square{position:relative;min-width:0;padding:0;border:0;border-radius:0;aspect-ratio:1;display:grid;place-items:center;cursor:pointer;background:#9daaa8;color:#090b0c}.square.dark{background:#365653}.square.selected{background:#00f6e7}.square.last{box-shadow:inset 0 0 0 3px #00f6e78a}.square.check{background:#b64d4d}.piece{font-family:Georgia,'Segoe UI Symbol',serif;font-size:clamp(28px,5.6vw,53px);line-height:1;pointer-events:none}.piece.white{color:#fff;text-shadow:1px 1px #182523,-1px -1px #182523,1px -1px #182523,-1px 1px #182523}.piece.black{color:#111c1a;text-shadow:0 1px #9daaa8}.square.legal:after{content:'';position:absolute;width:24%;height:24%;background:#00f6e7b0;border-radius:50%;pointer-events:none}.square.legal:has(.piece):after{width:85%;height:85%;background:none;border:3px solid #00f6e7}.coord{position:absolute;bottom:3px;right:4px;font:600 10px Montserrat,sans-serif;color:#13201e;pointer-events:none}.dark .coord{color:#e5eeec}.opponent{display:flex;justify-content:space-between;font-size:11px;letter-spacing:.08em;font-weight:800;margin:12px 0}.opponent span:last-child{color:#00f6e7}.chess-controls{padding:24px;border:1px solid #293332;border-radius:20px;background:#121718;align-self:start}.chess-controls #status{font-size:22px;font-weight:800;min-height:85px;margin:0 0 24px}.chess-controls fieldset{border:0;padding:0;margin:0 0 24px}.chess-controls legend{font-size:12px;color:#b7c1c5;margin-bottom:12px}.chess-controls label{display:inline-flex;gap:8px;align-items:center;margin-right:18px;font-size:14px}.chess-controls input{accent-color:#00f6e7}.chess-actions{display:flex;flex-wrap:wrap;gap:10px}.chess-actions button{border:1px solid #465251;border-radius:24px;padding:12px 16px;background:transparent;color:white;font-family:inherit;font-weight:800;cursor:pointer}.chess-actions #restart{background:#00f6e7;color:#090b0c;border-color:#00f6e7}.chess-actions button:disabled{opacity:.4;cursor:default}.chess-controls details{border-top:1px solid #293332;margin-top:24px;padding-top:18px;font-size:13px;line-height:1.6;color:#b7c1c5}.chess-controls summary{color:white;cursor:pointer;font-weight:800}dialog{background:#121718;color:white;border:1px solid #00f6e7;border-radius:20px;padding:24px;max-width:calc(100vw - 40px);font-family:Montserrat,sans-serif}dialog::backdrop{background:#000a}dialog h2{font-weight:800}#promotion-options{display:flex;gap:8px}#promotion-options button{background:#365653;color:white;border:0;border-radius:8px;padding:12px;font:36px Georgia;cursor:pointer}.square:focus-visible{z-index:1;outline:3px solid #fff;outline-offset:-3px}@media(max-width:700px){.chess-layout{grid-template-columns:1fr;gap:16px}.games header{margin-bottom:25px}.play-heading{margin-bottom:18px}.play-heading p{font-size:14px}.chess-controls{padding:18px}.chess-controls #status{font-size:18px;min-height:0;margin-bottom:18px}.chess-controls fieldset{margin-bottom:18px}.piece{font-size:clamp(26px,8.5vw,48px)}}