:root {
	--goban-size: 9;
	--goban-width: 80vh;
	--goban-height: var(--goban-width);
	--goban-border-width: 5vh;
	--goban-color: #dbae6e;

	--grid-size: calc(var(--goban-size) - 1);
	--grid-width: calc(var(--goban-width) - var(--goban-border-width) * 2 - calc(var(--grid-position) * 2));
	--grid-height: var(--grid-width);
	--grid-position: calc(calc(var(--goban-width) - var(--goban-border-width) * 2) / var(--goban-size) / 2);
	--grid-cell-width: calc(var(--grid-width) / var(--grid-size));
	--grid-border-width: 1px;
	--grid-border-color: hsl(0, 0%, 5%);

	--stone-size: calc(var(--grid-cell-width) - calc(var(--grid-cell-width) / 10));
}

* {
	box-sizing: border-box;
}

body {
	margin: 0;
	display: flex;
	justify-content: center;
	align-items: center;
	height: 100vh;
}

#goban {
	position: relative;
	width:  var(--goban-width);
	height: var(--goban-height);
	background-color:  var(--goban-color);
	border: var(--goban-border-width) solid var(--goban-color);
	border-radius: 3px;
	display: grid;
	grid-template-columns: repeat(var(--goban-size), 1fr);
    grid-template-rows: repeat(var(--goban-size), 1fr);
    box-shadow: 0px 8px 0px #b98c4c;
}
#goban:before {
	box-sizing: content-box;
    position: absolute;
    content: '';
    width: var(--grid-width);
	height: var(--grid-height);
    background-image: linear-gradient(to right,  black 0%, black 1.5%, transparent 1.5%, transparent 98.5%, black 98.5%, black 100%), linear-gradient(to bottom, black 0%, black 1.5%, transparent 1.5%, transparent 98.5%, black 98.5%, black 100%);
    background-size: var(--grid-cell-width) var(--grid-cell-width);
    border: var(--grid-border-width) solid var(--grid-border-color);
    border-bottom-width: 1.5px;
    border-right-width: 1.5px; 
    display: block;
    top: var(--grid-position);
    left: var(--grid-position);
    cursor: pointer;
}

.stone {
	width: 90%;
	height: 90%;
	border-radius: 50%;
	z-index: 2;
	justify-self: center;
	align-self: center;
	text-align: center;
	font-size: var(--stone-size);
	line-height: 1;
	text-shadow: 0px .05em .1em rgba(0,0,0,0.2);
	position: relative;
}
.stone:after {
	position: absolute;
	top: calc(var(--grid-cell-width)/9);
	left: 0px;
}

.stone.black:after {
	content: '⚫️';
/*	background: 
	  linear-gradient(145deg, transparent, black 65%),
	  radial-gradient(closest-corner at 42% 38%, hsla(0, 0%, 100%, 0.25) 0%, hsla(0, 0%, 100%, 0.25) 35%, transparent 36%) 
	  hsl(0, 0%, 10%);*/
}
.stone.white:after {
	content: '⚪️';
/*	background: 
	  linear-gradient(145deg, transparent, white 65%),
	  radial-gradient(closest-corner at 42% 38%, hsla(0, 0%, 100%, 1) 0%, hsla(0, 0%, 100%, 1) 35%, transparent 36%), 
	  hsl(0, 0%, 95%);*/
}

/* Stones positions */

.stone:nth-child(1) {
	grid-column: 3;
	grid-row: 3;
}
.stone:nth-child(2) {
	grid-column: 7;
	grid-row: 7;
}
.stone:nth-child(3) {
	grid-column: 7;
	grid-row: 2;
}
.stone:nth-child(4) {
	grid-column: 3;
	grid-row: 7;
}
.stone:nth-child(5) {
	grid-column: 8;
	grid-row: 4;
}
.stone:nth-child(6) {
	grid-column: 2;
	grid-row: 5;
}
.stone:nth-child(7) {
	grid-column: 4;
	grid-row: 5;
}
.stone:nth-child(8) {
	grid-column: 5;
	grid-row: 6;
}