.ca-wrap {
	max-width: 560px;
	margin: 0 auto;
}

.ca-board {
	display: grid;
	grid-template-columns: repeat(8, 1fr);
	border: 8px solid #4a2c82;
	border-radius: 8px;
	overflow: hidden;
	aspect-ratio: 1;
}

.ca-sq {
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: clamp(18px, 4.5vw, 36px);
	cursor: pointer;
	user-select: none;
	border: 0;
	padding: 0;
	line-height: 1;
}

.ca-sq.light { background: #f0d9b5; }
.ca-sq.dark { background: #b58863; }
.ca-sq.sel { outline: 3px solid #7c4dff; outline-offset: -3px; }
.ca-sq.move { box-shadow: inset 0 0 0 4px rgba(118, 255, 3, 0.55); }
.ca-sq.capture { box-shadow: inset 0 0 0 4px rgba(255, 82, 82, 0.7); }

.ca-sq.white-piece { color: #fafafa; text-shadow: 0 1px 1px #222; }
.ca-sq.black-piece { color: #111; }

@media (max-width: 520px) {
	.ca-board { border-width: 5px; }
}