body {
	margin: 0;
	padding: 0;
	min-height: 100vh;
	background: #ffffff;
	font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
	display: flex;
	flex-direction: column;
}

header {
	text-align: center;
	background: #ffffff;
	border-bottom: 1px solid #e4e4e7;
	padding: 2rem 1.5rem;
}

header h1 {
	margin: 0;
	font-size: 2rem;
	font-weight: 300;
	color: #18181b;
	letter-spacing: -0.02em;
}

header h2 {
	margin: 0.5rem 0 0 0;
	font-size: 0.875rem;
	font-weight: 400;
	color: #71717a;
}

main {
	flex: 1;
	display: flex;
	justify-content: center;
	align-items: center;
	padding: 2rem 1.5rem;
}

.board {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	grid-template-rows: repeat(3, 1fr);
	gap: 0.75rem;
	max-width: 500px;
	width: 100%;
	padding: 2rem;
	background: #ffffff;
	border-radius: 1rem;
	box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
	border: 1px solid #e4e4e7;
}

.square {
	aspect-ratio: 1;
	display: flex;
	align-items: center;
	justify-content: center;
	background: #ffffff;
	border-radius: 0.5rem;
	border: 1px solid #e4e4e7;
	transition: all 0.15s ease;
	cursor: pointer;
}

.square:hover {
	background: #fafafa;
	border-color: #d4d4d8;
}

.square:active {
	transform: scale(0.98);
}

.square > * {
	color: #18181b;
	font-size: 0.875rem;
	font-weight: 500;
	text-align: center;
	padding: 1rem;
}

#my-canvas {
	pointer-events: none;
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	z-index: 1000;
}

@media (max-width: 768px) {
	header {
		padding: 1.5rem 1rem;
	}

	header h1 {
		font-size: 1.5rem;
	}
	
	main {
		padding: 1rem;
		align-items: flex-start;
	}
	
	.board {
		gap: 0.5rem;
		padding: 1rem;
		max-width: 100%;
	}
	
	.square > * {
		font-size: 0.75rem;
		padding: 0.5rem;
		line-height: 1.3;
	}
}

@media (max-width: 480px) {
	header {
		padding: 1rem 0.75rem;
	}

	header h1 {
		font-size: 1.25rem;
	}

	header h2 {
		font-size: 0.75rem;
	}
	
	main {
		padding: 0.5rem;
	}
	
	.board {
		gap: 0.375rem;
		padding: 0.75rem;
		border-radius: 0.75rem;
	}

	.square {
		border-radius: 0.375rem;
	}
	
	.square > * {
		font-size: 0.65rem;
		padding: 0.375rem;
		line-height: 1.2;
	}
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
	body {
		background: #09090b;
	}

	header {
		background: #09090b;
		border-bottom: 1px solid #27272a;
	}

	header h1 {
		color: #fafafa;
	}

	header h2 {
		color: #a1a1aa;
	}

	.board {
		background: #09090b;
		border: 1px solid #27272a;
		box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 1px 2px -1px rgba(0, 0, 0, 0.3);
	}

	.square {
		background: #18181b;
		border: 1px solid #27272a;
	}

	.square:hover {
		background: #27272a;
		border-color: #3f3f46;
	}

	.square > * {
		color: #fafafa;
	}
}