diff --git a/web/src/features/dashboard/TimeseriesChart.tsx b/web/src/features/dashboard/TimeseriesChart.tsx
index 2debbdf..90303cc 100644
--- a/web/src/features/dashboard/TimeseriesChart.tsx
+++ b/web/src/features/dashboard/TimeseriesChart.tsx
@@ -1,6 +1,9 @@
 import { useEffect, useRef, useState } from "react";
+import * as stylex from "@stylexjs/stylex";
 import { formatTime } from "@/lib/format";
 import type { StatsTimeseries } from "@/lib/types";
+import { styles as shared } from "@/ui/styles";
+import { colors } from "@/ui/tokens.stylex";
 import { isEmptyTimeseries, layoutTimeseries, type BarLayout } from "./chartLayout";
 
 // Series colors validated for CVD separation and 3:1 surface contrast in both
@@ -14,6 +17,108 @@ const SERIES = [
 const CHART_HEIGHT = 240;
 const FALLBACK_WIDTH = 640;
 
+const styles = stylex.create({
+	empty: {
+		display: "flex",
+		alignItems: "center",
+		justifyContent: "center",
+		height: CHART_HEIGHT,
+		borderRadius: "0.25rem",
+		borderWidth: 1,
+		borderStyle: "dashed",
+		borderColor: colors.borderStrong,
+		fontSize: "0.875rem",
+		lineHeight: "1.25rem",
+		color: colors.textMuted,
+	},
+	chartRoot: {
+		position: "relative",
+	},
+	tooltip: {
+		pointerEvents: "none",
+		position: "absolute",
+		top: "0.5rem",
+		zIndex: 10,
+		borderRadius: "0.25rem",
+		borderWidth: 1,
+		borderStyle: "solid",
+		borderColor: colors.borderStrong,
+		backgroundColor: colors.surfaceRaised,
+		paddingInline: "0.75rem",
+		paddingBlock: "0.5rem",
+		fontSize: "0.75rem",
+		lineHeight: "1rem",
+		boxShadow: "0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1)",
+	},
+	/** Dynamic: the tooltip flips to whichever side of the bar has room. */
+	tooltipLeft: (left: number) => ({ left, right: null }),
+	tooltipRight: (right: number) => ({ left: null, right }),
+	tooltipTitle: {
+		fontWeight: 500,
+	},
+	tooltipList: {
+		display: "flex",
+		flexDirection: "column",
+		gap: "0.125rem",
+		marginTop: "0.25rem",
+	},
+	tooltipRow: {
+		display: "flex",
+		alignItems: "center",
+		justifyContent: "space-between",
+		gap: "1rem",
+	},
+	tooltipTerm: {
+		display: "flex",
+		alignItems: "center",
+		gap: "0.375rem",
+		color: colors.textMuted,
+	},
+	swatch: {
+		display: "inline-block",
+		borderRadius: "0.125rem",
+	},
+	/** Dynamic: the swatch takes the series colour the SVG bars are drawn in. */
+	swatchColor: (color: string) => ({ backgroundColor: color }),
+	swatchSmall: {
+		width: "0.5rem",
+		height: "0.5rem",
+	},
+	swatchLarge: {
+		width: "0.625rem",
+		height: "0.625rem",
+	},
+	gridLine: {
+		stroke: colors.border,
+	},
+	axisLine: {
+		stroke: colors.borderStrong,
+	},
+	axisLabel: {
+		fill: colors.textMuted,
+		fontSize: "10px",
+	},
+	/** The hairline separating touching segments is the page ground, not a colour. */
+	segment: {
+		stroke: colors.surface,
+	},
+	legend: {
+		marginTop: "0.5rem",
+		display: "flex",
+		flexWrap: "wrap",
+		columnGap: "1rem",
+		rowGap: "0.25rem",
+		fontSize: "0.75rem",
+		lineHeight: "1rem",
+		color: colors.textMuted,
+	},
+	legendItem: {
+		display: "flex",
+		alignItems: "center",
+		gap: "0.375rem",
+	},
+});
+
 function useContainerWidth(): [React.RefObject<HTMLDivElement | null>, number] {
 	const ref = useRef<HTMLDivElement>(null);
 	const [width, setWidth] = useState(0);
@@ -46,28 +151,29 @@ function barSummary(bar: BarLayout): string {
 function Tooltip({ bar, chartWidth }: { bar: BarLayout; chartWidth: number }) {
 	const centerX = bar.slot.x + bar.slot.width / 2;
 	const leftHalf = centerX < chartWidth / 2;
+	const side = leftHalf
+		? styles.tooltipLeft(Math.min(centerX + 8, chartWidth - 160))
+		: styles.tooltipRight(chartWidth - centerX + 8);
 	return (
-		<div
-			className="pointer-events-none absolute top-2 z-10 rounded border border-zinc-200 bg-white px-3 py-2 text-xs shadow-sm dark:border-zinc-700 dark:bg-zinc-900"
-			style={leftHalf ? { left: Math.min(centerX + 8, chartWidth - 160) } : { right: chartWidth - centerX + 8 }}
-		>
-			<div className="font-medium">{formatTime(bar.bucket.ts)}</div>
-			<dl className="mt-1 space-y-0.5">
-				<div className="flex justify-between gap-4">
-					<dt className="text-zinc-500">Queries</dt>
-					<dd className="tabular-nums">{bar.bucket.queries}</dd>
+		<div {...stylex.props(styles.tooltip, side)}>
+			<div {...stylex.props(styles.tooltipTitle)}>{formatTime(bar.bucket.ts)}</div>
+			<dl {...stylex.props(styles.tooltipList)}>
+				<div {...stylex.props(styles.tooltipRow)}>
+					<dt {...stylex.props(styles.tooltipTerm)}>Queries</dt>
+					<dd {...stylex.props(shared.tabularNums)}>{bar.bucket.queries}</dd>
 				</div>
 				{SERIES.map((series) => (
-					<div key={series.key} className="flex items-center justify-between gap-4">
-						<dt className="flex items-center gap-1.5 text-zinc-500">
+					<div key={series.key} {...stylex.props(styles.tooltipRow)}>
+						<dt {...stylex.props(styles.tooltipTerm)}>
 							<span
 								aria-hidden="true"
-								className="inline-block size-2 rounded-xs"
-								style={{ backgroundColor: series.color }}
+								{...stylex.props(styles.swatch, styles.swatchSmall, styles.swatchColor(series.color))}
 							/>
 							{series.label}
 						</dt>
-						<dd className="tabular-nums">{series.key === "other" ? bar.other : bar.bucket[series.key]}</dd>
+						<dd {...stylex.props(shared.tabularNums)}>
+							{series.key === "other" ? bar.other : bar.bucket[series.key]}
+						</dd>
 					</div>
 				))}
 			</dl>
@@ -82,11 +188,7 @@ export default function TimeseriesChart({ data }: { data: StatsTimeseries }) {
 
 	if (data.buckets.length === 0 || isEmptyTimeseries(data.buckets)) {
 		return (
-			<div
-				ref={containerRef}
-				className="flex items-center justify-center rounded border border-dashed border-zinc-300 text-sm text-zinc-500 dark:border-zinc-700"
-				style={{ height: CHART_HEIGHT }}
-			>
+			<div ref={containerRef} {...stylex.props(styles.empty)}>
 				No queries in this period.
 			</div>
 		);
@@ -97,7 +199,7 @@ export default function TimeseriesChart({ data }: { data: StatsTimeseries }) {
 	const hoveredBar = hovered !== null ? layout.bars[hovered] : undefined;
 
 	return (
-		<div ref={containerRef} className="relative">
+		<div ref={containerRef} {...stylex.props(styles.chartRoot)}>
 			<svg
 				role="img"
 				aria-label={`Queries over time, ${data.buckets.length} buckets: blocked, cached and other queries per bucket`}
@@ -113,14 +215,14 @@ export default function TimeseriesChart({ data }: { data: StatsTimeseries }) {
 							x2={layout.plot.x + layout.plot.width}
 							y1={tick.y}
 							y2={tick.y}
-							className="stroke-zinc-200 dark:stroke-zinc-800"
+							{...stylex.props(styles.gridLine)}
 						/>
 						<text
 							x={layout.plot.x - 6}
 							y={tick.y}
 							textAnchor="end"
 							dominantBaseline="middle"
-							className="fill-zinc-500 text-[10px] tabular-nums"
+							{...stylex.props(styles.axisLabel, shared.tabularNums)}
 						>
 							{compact.format(tick.value)}
 						</text>
@@ -131,7 +233,7 @@ export default function TimeseriesChart({ data }: { data: StatsTimeseries }) {
 					x2={layout.plot.x + layout.plot.width}
 					y1={baseline}
 					y2={baseline}
-					className="stroke-zinc-300 dark:stroke-zinc-700"
+					{...stylex.props(styles.axisLine)}
 				/>
 				{layout.xTicks.map((tick) => (
 					<text
@@ -139,7 +241,7 @@ export default function TimeseriesChart({ data }: { data: StatsTimeseries }) {
 						x={tick.x}
 						y={baseline + 14}
 						textAnchor="middle"
-						className="fill-zinc-500 text-[10px]"
+						{...stylex.props(styles.axisLabel)}
 					>
 						{formatTick(tick.ts, data.bucket_seconds)}
 					</text>
@@ -157,8 +259,8 @@ export default function TimeseriesChart({ data }: { data: StatsTimeseries }) {
 									width={rect.width}
 									height={rect.height}
 									fill={series.color}
-									className="stroke-zinc-50 dark:stroke-zinc-950"
 									strokeWidth={rect.width > 3 ? 1 : 0}
+									{...stylex.props(styles.segment)}
 								/>
 							);
 						})}
@@ -179,19 +281,18 @@ export default function TimeseriesChart({ data }: { data: StatsTimeseries }) {
 				))}
 			</svg>
 			{hoveredBar !== undefined && <Tooltip bar={hoveredBar} chartWidth={width} />}
-			<ul className="mt-2 flex flex-wrap gap-x-4 gap-y-1 text-xs text-zinc-600 dark:text-zinc-400">
+			<ul {...stylex.props(styles.legend)}>
 				{SERIES.map((series) => (
-					<li key={series.key} className="flex items-center gap-1.5">
+					<li key={series.key} {...stylex.props(styles.legendItem)}>
 						<span
 							aria-hidden="true"
-							className="inline-block size-2.5 rounded-xs"
-							style={{ backgroundColor: series.color }}
+							{...stylex.props(styles.swatch, styles.swatchLarge, styles.swatchColor(series.color))}
 						/>
 						{series.label}
 					</li>
 				))}
 			</ul>
-			<table className="sr-only">
+			<table {...stylex.props(shared.srOnly)}>
 				<caption>Queries per time bucket</caption>
 				<thead>
 					<tr>