index.css

* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
	-webkit-tap-highlight-color: transparent !important;
}

body {
	width: 100%;
	height: 100vh;
	font-family: monospace;
	background-color: #333;
	color: white;
	color-scheme: dark;
	transition: opacity 450ms;
	opacity: 1;
}

.fade {
	opacity: 0;
}

body.light {
	background-color: #fff;
	color: #000;
	color-scheme: light;
}

#setup,
#game {
	display: none;
}

.setup-active #setup {
	display: flex;
	width: 100%;
	height: 100%;
	max-width: 350px;
	margin: auto;
	padding: 20px 0;
	flex-direction: column;
	align-items: center;
}

h1 {
	font-size: 3.8em;
	margin: 10px auto;
}

#diskc {
	padding: 5px;
	background-color: #008000;
	border-radius: 5px;
	margin: 5px;
}

#setupdisk {
	width: 1.2em;
	height: 1.2em;
	border-radius: 50%;
	background-color: black;
	transition: background-color linear 300ms;
}

.option {
	width: 100%;
	display: flex;
	flex-direction: row;
	justify-content: space-between;
	align-items: center;
	padding: 10px 5px;
	font-size: 1.5em;
}

.suboption {
	display: flex;
	flex-direction: row;
	flex-wrap: nowrap;
	align-items: center;
}

.option select {
	font-size: 1rem;
	font-family: monospace;
	padding: 5px;
}

.modal {
	display: flex;
	background-color: #444;
	color: #ffffff;
	width: 90vw;
	max-height: 90vh;
	max-width: 300px;
	position: fixed;
	bottom: 5vh;
	left: 0;
	right: 0;
	margin: auto;
	padding: 20px 0;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	transition: transform 500ms cubic-bezier(0.85, -0.4, 0.07, 1.43), opacity 200ms linear;
	z-index: 5;
	transform: translateY(150%);
	opacity: 0;
	border-radius: 10px;
}

#rules {
	max-width: 800px;
	padding: 30px 15px 20px 30px;
	height: 90vh;
	overflow-y: auto;
	display: block;
}

#rules p {
	font-size: 1.4em;
	margin-bottom: 8px;
}

#github {
	padding: 5px 10px;
	margin: 5px 5px 10px 5px;
	text-decoration: none;
	background-color: #ddd;
	color: #000;
	font-size: 1.2rem;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	border-radius: 4px;
}

#github img {
	width: 1.2rem;
	height: 1.2rem;
	margin: 0 5px;
}

#closeModal {
	padding: 5px;
	width: 1.5em;
	font-size: 2em;
	position: absolute;
	top: 5px;
	right: 5px;
	background-color: #ff0000;
	color: #fff;
	border: none;
	border-radius: 5px;
	cursor: pointer;
}

.light .modal {
	background-color: #fff;
	color: #000;
}

#victory-btns {
	display: flex;
	flex-direction: row;
	flex-wrap: wrap;
	align-items: center;
	justify-content: center;
}

#winner {
	font-size: 2.5em;
	padding: 2px 0 15px 0;
}

.visible.modal {
	transform: translateY(0);
	opacity: 1;
}

#backdrop {
	width: 100vw;
	height: 100vh;
	position: fixed;
	top: 0;
	left: 0;
	z-index: 3;
	background-color: rgba(0, 0, 0, 0);
	transition: background-color linear 300ms;
}

.active#backdrop {
	background-color: rgba(0, 0, 0, 0.4);
}

.btn {
	background-color: #008000;
	color: #fff;
	padding: 5px 15px;
	font-size: 1.3rem;
	border: none;
	border-radius: 5px;
	margin: 5px;
	box-shadow: 0 2px 2px 0px rgba(0, 0, 0, 0.7);
	font-family: monospace;
	transition: background-color 300ms linear, box-shadow 300ms linear, transform 300ms linear;
	cursor: pointer;
}

.btn:hover {
	background-color: #059805;
}

.btn:active {
	background-color: #059805;
	box-shadow: none;
	transform: translateY(4px);
}

#cancel {
	background-color: #ff0000;
}

#cancel:hover {
	background-color: #ff4646;
}

#cancel:active {
	box-shadow: none;
}

.game-active #game {
	display: flex;
	flex-direction: column;
	flex-wrap: nowrap;
	align-items: center;
	justify-content: center;
	width: 100%;
	height: 100%;
	z-index: 1;
}

#state {
	width: 95vmin;
	display: flex;
	flex-direction: row;
	flex-wrap: nowrap;
	align-items: center;
	justify-content: center;
	font-size: calc(10px + 1vmin);
}

.score {
	display: flex;
	flex-direction: row;
	flex-wrap: nowrap;
	align-items: center;
	justify-content: center;
	flex-grow: 0;
	flex-shrink: 0;
	padding: 10px;
	border-radius: 15px;
	background-color: #008000;
	color: #fff;
}

#scorep1,
#scorep2 {
	font-family: monospace;
	padding-left: 5px;
	font-size: 2em;
}

#blackdisk,
#whitedisk {
	width: 6vmin;
	height: 6vmin;
	border-radius: 50%;
	background-color: black;
}

#whitedisk {
	background-color: white;
}

#turn {
	font-size: 1.5em;
	flex-grow: 1;
	flex-shrink: 1;
	text-align: center;
	font-family: monospace;
}

#undo,
#stop {
	padding: 5px;
	background-color: #444444;
	color: white;
	border-radius: 8px;
	font-size: 1.5em;
	margin: 0 5px;
	border: none;
	cursor: pointer;
	box-shadow: 0 2px 2px 0px rgba(0, 0, 0, 0.7);
	transition: box-shadow 300ms linear, transform 300ms linear;
}

#undo:active, #stop:active {
	box-shadow: none;
	transform: translateY(4px);
}

#minigrid {
	display: grid;
	width: 30vmin;
	height: 30vmin;
	grid-template: repeat(2, 1fr) / repeat(2, 1fr);
	margin: 15px 0;
	position: relative;
	border-radius: 5px;
	flex-shrink: 0;
}

#minigrid .square:first-of-type {
	border-top-left-radius: 10px;
}

#minigrid .square:last-of-type {
	border-bottom-right-radius: 10px;
}

#minigrid .square:nth-of-type(2) {
	border-top-right-radius: 10px;
}

#minigrid .square:nth-of-type(3) {
	border-bottom-left-radius: 10px;
}

#grid .square:first-of-type {
	border-top-left-radius: 10px;
}

#grid .square:last-of-type {
	border-bottom-right-radius: 10px;
}

#grid .square:nth-of-type(8) {
	border-top-right-radius: 10px;
}

#grid .square:nth-of-type(57) {
	border-bottom-left-radius: 10px;
}

#grid {
	display: grid;
	width: 80vmin;
	height: 80vmin;
	grid-template: repeat(8, 1fr) / repeat(8, 1fr);
	margin: 15px 0;
	position: relative;
}

.game-active #grid::after {
	content: "";
	width: 10px;
	height: 10px;
	background-color: #000;
	position: absolute;
	top: calc(25% - 5px);
	left: calc(25% - 5px);
	border-radius: 50%;
	box-shadow: 0 40vmin 0 0 #000, 40vmin 40vmin 0 0 #000, 40vmin 0 0 0 #000;
}

@media screen and (max-aspect-ratio: 3/5) {
	#minigrid {
		width: 60vw;
		height: 60vw;
	}
	.game-active #grid {
		width: 95vmin;
		height: 95vmin;
	}
	.game-active #grid::after {
		box-shadow: 0 47.5vmin 0 0 #000, 47.5vmin 47.5vmin 0 0 #000, 47.5vmin 0 0 0 #000;
	}
	#state {
		font-size: 3vw;
	}
}

@media screen and (min-aspect-ratio: 14/9) {
	.game-active #grid {
		width: 95vmin;
		height: 95vmin;
	}
	.game-active #grid::after {
		box-shadow: 0 47.5vmin 0 0 #000, 47.5vmin 47.5vmin 0 0 #000, 47.5vmin 0 0 0 #000;
	}
	.game-active #game {
		display: flex;
		flex-direction: row;
		flex-wrap: nowrap;
		align-items: center;
		justify-content: center;
		width: 100%;
		height: 100%;
	}
	#state {
		flex-direction: column;
		width: auto;
		height: 95vh;
		align-items: center;
		justify-content: space-evenly;
		padding: 0 10px;
	}
	#turn {
		flex-grow: 0;
	}
}

.square {
	border: thin solid black;
	background-color: #0a880a;
	position: relative;
	transition: background-color 200ms;
	-webkit-tap-highlight-color: transparent;
}

.focused::before {
	content: "";
	width: 90%;
	height: 90%;
	position: absolute;
	top: 5%;
	left: 5%;
	box-sizing: border-box;
	border: 2px solid black;
	border-radius: 5px;
}

.square::after,
.square::before {
	position: absolute;
	content: "";
	width: 80%;
	height: 80%;
	background-color: #0a880a;
	top: 10%;
	left: 10%;
	border-radius: 50%;
	transition: transform 200ms linear, box-shadow 300ms linear;
	transform: rotate(315deg) scaleY(0);
	z-index: 0;
}

.square::before {
	opacity: 0;
	transform: rotate(315deg) scaleY(1);
	transition: opacity 400ms, background-color 300ms;
}

@keyframes wtob {
	from {
		background-color: white;
		transform: rotate(315deg) scaleY(1);
	}
	50% {
		background-color: white;
		transform: rotate(315deg) scaleY(0);
	}
	51% {
		background-color: black;
		transform: rotate(315deg) scaleY(0);
	}
	to {
		background-color: black;
		transform: rotate(315deg) scaleY(1);
	}
}

#minigrid .square[data-player="1"]::after {
	animation: minianim 3000ms linear infinite alternate;
}

#minigrid .square[data-player="2"]::after {
	animation: minianim 3000ms linear 3000ms infinite alternate;
}

@keyframes minianim {
	0% {
		background-color: white;
		transform: rotate(315deg) scaleY(1);
	}
	45% {
		background-color: white;
		transform: rotate(315deg) scaleY(1);
	}
	50% {
		background-color: white;
		transform: rotate(315deg) scaleY(0);
	}
	51% {
		background-color: black;
		transform: rotate(315deg) scaleY(0);
	}
	55% {
		background-color: black;
		transform: rotate(315deg) scaleY(1);
	}
	100% {
		background-color: black;
		transform: rotate(315deg) scaleY(1);
	}
}

.square[data-player="1"]::after {
	background-color: black;
	box-shadow: 2px 2px 8px 0px rgba(0, 0, 0, 0.5);
	transform: rotate(315deg) scaleY(1);
	z-index: 2;
}

.square.filled[data-player="1"]::after {
	animation: wtob 300ms linear forwards;
}

@keyframes btow {
	from {
		background-color: black;
		transform: rotate(315deg) scaleY(1);
	}
	50% {
		background-color: black;
		transform: rotate(315deg) scaleY(0);
	}
	51% {
		background-color: white;
		transform: rotate(315deg) scaleY(0);
	}
	to {
		background-color: white;
		transform: rotate(315deg) scaleY(1);
	}
}

.square[data-player="2"]::after {
	background-color: white;
	box-shadow: 2px 2px 8px 0px rgba(0, 0, 0, 0.5);
	transform: rotate(315deg) scaleY(1);
	z-index: 2;
}

.square.filled[data-player="2"]::after {
	animation: btow 300ms linear forwards;
}

.valid {
	cursor: pointer;
}

.turn-Black .valid::before {
	opacity: 0.4;
	transform: scaleY(1);
	background-color: black;
}

.turn-White .valid::before {
	opacity: 0.4;
	transform: scaleY(1);
	background-color: white;
}