:root {
	--color-bg: #f1f5f9;
	--color-surface: #ffffff;
	--color-text: #0f172a;
	--color-text-muted: #64748b;
	--color-border: #e2e8f0;
	--color-pool: #0ea5e9;
	--color-pool-soft: #e0f2fe;
	--color-pool-dark: #0284c7;
	--color-outside: #94a3b8;
	--color-outside-soft: #f1f5f9;
	--color-target: #f43f5e;
	--shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
	--shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
	--shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.1);
	--radius-sm: 8px;
	--radius-md: 14px;
	--radius-lg: 20px;
	--font: 'DM Sans', system-ui, -apple-system, sans-serif;
}

*,
*::before,
*::after {
	box-sizing: border-box;
}

html {
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

body {
	margin: 0;
	min-height: 100vh;
	font-family: var(--font);
	font-size: 16px;
	line-height: 1.5;
	color: var(--color-text);
	background:
		radial-gradient(ellipse 80% 50% at 50% -10%, rgba(14, 165, 233, 0.12), transparent),
		var(--color-bg);
}

.app {
	max-width: 960px;
	margin: 0 auto;
	padding: 0 20px 40px;
}

/* Header */

.header {
	padding: 32px 0 28px;
}

.header-inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
}

.brand {
	display: flex;
	align-items: center;
	gap: 14px;
}

.brand-icon {
	display: flex;
	align-items: center;
	justify-content: center;
	width: 48px;
	height: 48px;
	border-radius: var(--radius-md);
	background: linear-gradient(135deg, var(--color-pool-soft), #bae6fd);
	box-shadow: var(--shadow-sm);
	font-size: 1.5rem;
	line-height: 1;
}

.brand h1 {
	margin: 0;
	font-size: 1.5rem;
	font-weight: 700;
	letter-spacing: -0.02em;
	line-height: 1.2;
}

.brand-tagline {
	margin: 2px 0 0;
	font-size: 0.875rem;
	color: var(--color-text-muted);
	font-weight: 400;
}

/* Metrics */

.main {
	display: flex;
	flex-direction: column;
	gap: 20px;
}

.metrics {
	display: grid;
	grid-template-columns: repeat(2, 1fr);
	gap: 16px;
}

.metric-card {
	padding: 20px 22px;
	border-radius: var(--radius-md);
	background: var(--color-surface);
	border: 1px solid var(--color-border);
	box-shadow: var(--shadow-sm);
	transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.metric-card:hover {
	box-shadow: var(--shadow-md);
	transform: translateY(-1px);
}

.metric-card--pool {
	border-top: 3px solid var(--color-pool);
}

.metric-card--outside {
	border-top: 3px solid var(--color-outside);
}

.metric-card--link {
	text-decoration: none;
	color: inherit;
	cursor: pointer;
}

.metric-card--link:hover {
	border-color: #cbd5e1;
}

.metric-card--link:focus-visible {
	outline: 2px solid var(--color-pool);
	outline-offset: 2px;
}

.metric-link-hint {
	margin-left: auto;
	font-size: 0.75rem;
	color: var(--color-text-muted);
	opacity: 0;
	transition: opacity 0.15s ease;
}

.metric-card--link:hover .metric-link-hint,
.metric-card--link:focus-visible .metric-link-hint {
	opacity: 1;
}

.metric-card-header {
	display: flex;
	align-items: center;
	gap: 8px;
	margin-bottom: 10px;
}

.metric-dot {
	width: 8px;
	height: 8px;
	border-radius: 50%;
	flex-shrink: 0;
}

.metric-dot--pool {
	background: var(--color-pool);
	box-shadow: 0 0 0 3px var(--color-pool-soft);
}

.metric-dot--outside {
	background: var(--color-outside);
	box-shadow: 0 0 0 3px var(--color-outside-soft);
}

.metric-label {
	font-size: 0.8125rem;
	font-weight: 600;
	text-transform: uppercase;
	letter-spacing: 0.06em;
	color: var(--color-text-muted);
}

.metric-value-row {
	display: flex;
	align-items: baseline;
	gap: 4px;
}

.metric-value {
	font-size: 2.75rem;
	font-weight: 700;
	letter-spacing: -0.03em;
	line-height: 1;
	font-variant-numeric: tabular-nums;
	transition: color 0.3s ease;
}

.metric-card--pool .metric-value {
	color: var(--color-pool-dark);
}

.metric-card--outside .metric-value {
	color: var(--color-text);
}

.metric-unit {
	font-size: 1.25rem;
	font-weight: 500;
	color: var(--color-text-muted);
}

.last-updated {
	margin: 0;
	text-align: center;
	font-size: 0.8125rem;
	color: var(--color-text-muted);
}

/* Chart section */

.chart-section {
	display: flex;
	flex-direction: column;
	gap: 14px;
}

.chart-toolbar {
	display: flex;
	align-items: center;
	justify-content: space-between;
	flex-wrap: wrap;
	gap: 12px;
}

.section-title {
	margin: 0;
	font-size: 1.125rem;
	font-weight: 600;
	letter-spacing: -0.01em;
}

/* Segmented range selector */

.range-selector {
	display: inline-flex;
	padding: 4px;
	background: var(--color-surface);
	border: 1px solid var(--color-border);
	border-radius: var(--radius-sm);
	box-shadow: var(--shadow-sm);
	gap: 2px;
}

.range-selector input[type="radio"] {
	position: absolute;
	opacity: 0;
	width: 0;
	height: 0;
	pointer-events: none;
}

.range-selector label {
	display: inline-block;
	padding: 6px 12px;
	font-size: 0.8125rem;
	font-weight: 500;
	color: var(--color-text-muted);
	border-radius: 6px;
	cursor: pointer;
	user-select: none;
	transition: background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
	white-space: nowrap;
}

.range-selector label:hover {
	color: var(--color-text);
	background: var(--color-bg);
}

.range-selector input:checked + label {
	background: var(--color-pool);
	color: #fff;
	box-shadow: 0 1px 3px rgba(14, 165, 233, 0.4);
}

/* Chart card */

.chart-card {
	background: var(--color-surface);
	border: 1px solid var(--color-border);
	border-radius: var(--radius-md);
	box-shadow: var(--shadow-md);
	overflow: hidden;
}

.chart-container {
	min-height: 360px;
	padding: 8px 4px 4px;
}

/* Legend */

.chart-legend {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: 20px;
	padding: 4px 0;
}

.legend-item {
	display: flex;
	align-items: center;
	gap: 7px;
	font-size: 0.8125rem;
	color: var(--color-text-muted);
	font-weight: 500;
}

.legend-swatch {
	width: 12px;
	height: 3px;
	border-radius: 2px;
	flex-shrink: 0;
}

.legend-swatch--pool {
	background: var(--color-pool);
	height: 3px;
}

.legend-swatch--outside {
	background: var(--color-outside);
}

.legend-swatch--target {
	background: var(--color-target);
	border-top: 1px dashed var(--color-target);
	height: 0;
	width: 16px;
}

/* Footer */

.footer {
	margin-top: 40px;
	padding-top: 24px;
	border-top: 1px solid var(--color-border);
}

.footer-links {
	display: flex;
	align-items: center;
	justify-content: center;
	flex-wrap: wrap;
	gap: 8px 16px;
}

.footer-links a {
	font-size: 0.8125rem;
	color: var(--color-text-muted);
	text-decoration: none;
	transition: color 0.15s ease;
}

.footer-links a:hover {
	color: var(--color-pool-dark);
}

.footer-separator {
	width: 4px;
	height: 4px;
	border-radius: 50%;
	background: var(--color-border);
}

/* Responsive */

@media (max-width: 600px) {
	.app {
		padding: 0 16px 32px;
	}

	.header {
		padding: 24px 0 20px;
	}

	.metrics {
		grid-template-columns: 1fr;
	}

	.metric-value {
		font-size: 2.25rem;
	}

	.chart-toolbar {
		flex-direction: column;
		align-items: stretch;
	}

	.range-selector {
		overflow-x: auto;
		-webkit-overflow-scrolling: touch;
	}

	.chart-container {
		min-height: 280px;
	}
}