*{
	box-sizing: border-box;
}
html, body {
	height: 100%;
	margin: 0;
	font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;
	background: linear-gradient(180deg, #0f172a 0%, #001219 100%);
	color: #fff;
}

.visually-hidden {
	position: absolute !important;
	height: 1px; width: 1px;
	overflow: hidden; clip: rect(1px, 1px, 1px, 1px);
	white-space: nowrap; border: 0; padding: 0; margin: -1px;
}

.grid-wrapper {
	min-height: 100vh;
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 24px;
}

.weeks-grid {
	display: grid;
	grid-template-columns: repeat(2, minmax(180px, 1fr));
	grid-template-rows: repeat(2, minmax(120px, 1fr));
	gap: 18px;
	width: min(1200px, 100%);
	height: min(800px, 100vh - 48px);
}

.week-btn {
	display: flex;
	align-items: center;
	justify-content: center;
	text-decoration: none;
	background: linear-gradient(135deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
	border: 1px solid rgba(255,255,255,0.08);
	padding: 24px;
	font-size: clamp(18px, 4vw, 36px);
	font-weight: 700;
	color: #fff;
	border-radius: 12px;
	transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
	text-align: center;
	box-shadow: 0 6px 18px rgba(2,6,23,0.6);
}

.week-btn:hover,
.week-btn:focus {
	transform: translateY(-6px) scale(1.01);
	background: linear-gradient(135deg, rgba(255,255,255,0.09), rgba(255,255,255,0.03));
	outline: none;
	box-shadow: 0 12px 30px rgba(2,6,23,0.75);
}

.week-btn:active {
	transform: translateY(-2px) scale(0.995);
}

@media (max-width: 520px) {
	.weeks-grid {
		grid-template-columns: 1fr;
		grid-template-rows: repeat(4, minmax(96px, 1fr));
		gap: 12px;
		height: auto;
	}
}