From cc1589b0171ef46fdcee3e16f5b5dcd92a48ee8a Mon Sep 17 00:00:00 2001
From: Vincent van der Wal <github@vincentvanderwal.nl>
Date: Sat, 25 Jul 2026 16:14:13 +0200
Subject: [PATCH] daycards strip

---
 src/lib/paywall/PaywallGate.svelte            |   5 +-
 src/lib/paywall/UnlockDialog.svelte           |   6 +-
 src/lib/paywall/config.ts                     |  42 ++-
 .../weather/week/[location]/+page.svelte      |  69 +++--
 .../week/[location]/DailyStripSticky.svelte   | 289 ++++++++++++++++++
 .../week/[location]/ModelSelector.svelte      |  21 +-
 .../weather/week/[location]/variables.ts      |   5 +-
 7 files changed, 401 insertions(+), 36 deletions(-)
 create mode 100644 src/routes/weather/week/[location]/DailyStripSticky.svelte

diff --git a/src/lib/paywall/PaywallGate.svelte b/src/lib/paywall/PaywallGate.svelte
index a0df6af..6258eb0 100644
--- a/src/lib/paywall/PaywallGate.svelte
+++ b/src/lib/paywall/PaywallGate.svelte
@@ -2,7 +2,7 @@
 	import { onMount } from 'svelte';
 
 	import UnlockDialog from './UnlockDialog.svelte';
-	import { PREMIUM_PERKS, PREMIUM_PRICE, SIGNUP_URL } from './config';
+	import { PREMIUM_PERKS, SIGNUP_URL, getPremiumPrice } from './config';
 	import { isPremium, premiumState, refreshPremium } from './premium';
 
 	interface Props {
@@ -14,6 +14,7 @@
 	let { feature = 'This page', children }: Props = $props();
 
 	let unlockOpen = $state(false);
+	const price = getPremiumPrice();
 
 	// Re-verify the stored key whenever the gate mounts.
 	onMount(refreshPremium);
@@ -53,7 +54,7 @@
 
 		<h2 class="text-xl font-bold tracking-tight">{feature} is a premium feature</h2>
 		<p class="mx-auto mt-1.5 max-w-sm text-sm text-muted-foreground">
-			Support this open-source weather project and unlock the extras from {PREMIUM_PRICE}.
+			Support this open-source weather project and unlock the extras from {price}.
 		</p>
 
 		<ul class="mx-auto mt-5 grid max-w-sm gap-2 text-left">
diff --git a/src/lib/paywall/UnlockDialog.svelte b/src/lib/paywall/UnlockDialog.svelte
index 6f71c93..8e8e7ba 100644
--- a/src/lib/paywall/UnlockDialog.svelte
+++ b/src/lib/paywall/UnlockDialog.svelte
@@ -6,7 +6,7 @@
 	import { Input } from '$lib/components/ui/input';
 	import { Label } from '$lib/components/ui/label';
 
-	import { PREMIUM_PRICE, SIGNUP_URL } from './config';
+	import { SIGNUP_URL, getPremiumPrice } from './config';
 	import { clearLicense, isPremium, premiumState, storedLicenseKey, verifyKey } from './premium';
 
 	interface Props {
@@ -15,6 +15,8 @@
 
 	let { open = $bindable(false) }: Props = $props();
 
+	const price = getPremiumPrice();
+
 	// Prefill with the stored key so an existing subscriber sees their key.
 	let keyInput = $state('');
 	let submitting = $state(false);
@@ -129,7 +131,7 @@
 						rel="noopener"
 						class="font-semibold text-primary underline-offset-2 hover:underline"
 					>
-						Subscribe from {PREMIUM_PRICE}
+						Subscribe from {price}
 					</a>
 				</p>
 			{/if}
diff --git a/src/lib/paywall/config.ts b/src/lib/paywall/config.ts
index e2842d5..6c20004 100644
--- a/src/lib/paywall/config.ts
+++ b/src/lib/paywall/config.ts
@@ -19,8 +19,46 @@ export const PAYWALL_API_BASE = stripTrailingSlash(
 /** Where prospective subscribers go to sign up (the paywall repo's signup form). */
 export const SIGNUP_URL = env.VITE_PAYWALL_SIGNUP_URL ?? `${PAYWALL_API_BASE}/`;
 
-/** Display price, shown on the paywall panel. */
-export const PREMIUM_PRICE = env.VITE_PREMIUM_PRICE ?? '€3 / month';
+// ─── Location-based pricing ──────────────────────────────────────────────────
+// The signup form charges 3 in the visitor's currency (EUR / USD / CHF), picked
+// from their location. Mirror that here so the paywall copy matches. Detection
+// is timezone/locale based (no network geo lookup) and guarded for SSR.
+
+const CURRENCY_SYMBOL: Record<string, string> = { EUR: '€', USD: '$', CHF: 'CHF' };
+const US_ZONES =
+	/^America\/(New_York|Detroit|Chicago|Denver|Boise|Phoenix|Los_Angeles|Anchorage|Adak|Juneau|Sitka|Nome|Yakutat|Menominee|Indiana|Kentucky|North_Dakota)/;
+
+export type PremiumCurrency = 'EUR' | 'USD' | 'CHF';
+
+export function detectCurrency(): PremiumCurrency {
+	if (typeof Intl === 'undefined') return 'EUR';
+	let tz = '';
+	try {
+		tz = Intl.DateTimeFormat().resolvedOptions().timeZone || '';
+	} catch {
+		/* ignore */
+	}
+	if (/Zurich|Vaduz/.test(tz)) return 'CHF';
+	let region = '';
+	try {
+		if (typeof navigator !== 'undefined') {
+			region = new Intl.Locale(navigator.language).maximize().region || '';
+		}
+	} catch {
+		/* ignore */
+	}
+	if (region === 'CH') return 'CHF';
+	if (region === 'US' || US_ZONES.test(tz)) return 'USD';
+	return 'EUR';
+}
+
+/** Display price for the paywall panel, e.g. "€3 / month" or "CHF 3 / month". */
+export function getPremiumPrice(): string {
+	if (env.VITE_PREMIUM_PRICE) return env.VITE_PREMIUM_PRICE;
+	const currency = detectCurrency();
+	const symbol = CURRENCY_SYMBOL[currency];
+	return currency === 'CHF' ? `${symbol} 3 / month` : `${symbol}3 / month`;
+}
 
 /** Short, human list of what premium unlocks (shown on the locked panel). */
 export const PREMIUM_PERKS = [
diff --git a/src/routes/weather/week/[location]/+page.svelte b/src/routes/weather/week/[location]/+page.svelte
index 62fb67a..3ec0d4a 100644
--- a/src/routes/weather/week/[location]/+page.svelte
+++ b/src/routes/weather/week/[location]/+page.svelte
@@ -18,6 +18,7 @@
 
 	import { defaultParameters } from '../../options';
 	import DailyCards from './DailyCards.svelte';
+	import DailyStripSticky from './DailyStripSticky.svelte';
 	import HourlyTable from './HourlyTable.svelte';
 	import MeteogramCharts from './MeteogramCharts.svelte';
 	import ModelSelector from './ModelSelector.svelte';
@@ -199,33 +200,55 @@
 			</div>
 		{/if}
 
-		<DailyCards
-			daily={fetchedDaily}
-			{selectedDay}
-			units={params}
-			onSelectDay={switchDay}
-			canExtend={forecastDays < 15}
-			onExtend={() => (forecastDays = 15)}
-			canExtendPast={pastDays < 3}
-			onExtendPast={() => (pastDays = 3)}
-		/>
-
-		{#if fetchedHourly && fetchedDaily}
-			<HourlyTable
-				data={fetchedHourly}
+		<!-- Desktop: the full day cards -->
+		<div class="hidden md:block">
+			<DailyCards
 				daily={fetchedDaily}
 				{selectedDay}
 				units={params}
-				locationName={location.name ?? ''}
-				onCustomize={() => (variableSidebarOpen = true)}
+				onSelectDay={switchDay}
+				canExtend={forecastDays < 15}
+				onExtend={() => (forecastDays = 15)}
+				canExtendPast={pastDays < 3}
+				onExtendPast={() => (pastDays = 3)}
 			/>
-		{:else}
-			<!-- placeholder with the table's approximate height: no layout shift -->
-			<div
-				transition:fade={{ duration: 200 }}
-				class="h-[430px] animate-pulse rounded-2xl border border-border/70 bg-card"
-			></div>
-		{/if}
+		</div>
+
+		<!-- Mobile: a compact day strip and the hourly table share this wrapper, so
+		     the strip stays stuck (collapsing as it goes) while scrolling the table
+		     and then releases exactly at the table's bottom, freeing the meteograms.
+		     The strip itself is hidden on md+ (the desktop cards above take over). -->
+		<div>
+			{#if fetchedDaily}
+				<DailyStripSticky
+					daily={fetchedDaily}
+					{selectedDay}
+					units={params}
+					onSelectDay={switchDay}
+					canExtend={forecastDays < 15}
+					onExtend={() => (forecastDays = 15)}
+					canExtendPast={pastDays < 3}
+					onExtendPast={() => (pastDays = 3)}
+				/>
+			{/if}
+
+			{#if fetchedHourly && fetchedDaily}
+				<HourlyTable
+					data={fetchedHourly}
+					daily={fetchedDaily}
+					{selectedDay}
+					units={params}
+					locationName={location.name ?? ''}
+					onCustomize={() => (variableSidebarOpen = true)}
+				/>
+			{:else}
+				<!-- placeholder with the table's approximate height: no layout shift -->
+				<div
+					transition:fade={{ duration: 200 }}
+					class="h-107.5 animate-pulse rounded-2xl border border-border/70 bg-card"
+				></div>
+			{/if}
+		</div>
 
 		{#if fetchedHourly}
 			<MeteogramCharts data={fetchedHourly} {selectedDay} units={params} {loading} />
diff --git a/src/routes/weather/week/[location]/DailyStripSticky.svelte b/src/routes/weather/week/[location]/DailyStripSticky.svelte
new file mode 100644
index 0000000..863caec
--- /dev/null
+++ b/src/routes/weather/week/[location]/DailyStripSticky.svelte
@@ -0,0 +1,289 @@
+<script lang="ts">
+	import { onMount, tick } from 'svelte';
+
+	import { formatZoned, getRelativeDayLabel, isSameDayInZone } from '$lib/utils/date';
+
+	import { getTempStyle } from '../../utils/colors';
+	import { getWeatherIconName } from '../../utils/weather-codes';
+	import { type FetchedDaily, type WeatherUnits } from './types';
+
+	interface Props {
+		daily: FetchedDaily | null;
+		selectedDay: Date;
+		units: WeatherUnits;
+		onSelectDay: (date: Date, index: number) => void;
+		canExtend?: boolean;
+		onExtend?: () => void;
+		canExtendPast?: boolean;
+		onExtendPast?: () => void;
+	}
+
+	let {
+		daily,
+		selectedDay,
+		units,
+		onSelectDay,
+		canExtend = false,
+		onExtend,
+		canExtendPast = false,
+		onExtendPast
+	}: Props = $props();
+
+	// ─── Scroll-driven collapse (full → compact) ────────────────────────────────
+	// 0 = full cards (at the top of the page), 1 = compact square strip (stuck).
+	// The progress sentinel sits ABOVE the sticky strip, so the strip shrinking
+	// (which reflows the table BELOW it) never feeds back into the measurement.
+	let progress = $state(0);
+	let sentinelEl = $state<HTMLDivElement>();
+	let stripScrollEl = $state<HTMLDivElement>();
+	let daysWrapEl = $state<HTMLDivElement>();
+	// Resolved in onMount (client only) so this never touches `window` during the
+	// prerender of city pages.
+	let scrollParent: HTMLElement | Window | null = $state(null);
+
+	const clamp = (v: number, lo = 0, hi = 1) => Math.min(hi, Math.max(lo, v));
+	const lerp = (a: number, b: number) => a + (b - a) * progress;
+
+	function findScrollParent(el: HTMLElement | null): HTMLElement | Window {
+		let node = el?.parentElement ?? null;
+		while (node) {
+			const oy = getComputedStyle(node).overflowY;
+			if (oy === 'auto' || oy === 'scroll') return node;
+			node = node.parentElement;
+		}
+		return window;
+	}
+
+	// Distance (px) over which the collapse plays out once the strip sticks.
+	const RANGE = 120;
+	let ticking = false;
+
+	function measure() {
+		ticking = false;
+		if (!sentinelEl || !scrollParent) return;
+		const topRef = scrollParent instanceof Window ? 0 : scrollParent.getBoundingClientRect().top;
+		const top = sentinelEl.getBoundingClientRect().top - topRef;
+		progress = clamp(-top / RANGE);
+	}
+
+	function onScroll() {
+		if (ticking) return;
+		ticking = true;
+		requestAnimationFrame(measure);
+	}
+
+	onMount(() => {
+		scrollParent = findScrollParent(sentinelEl ?? null);
+		const target: EventTarget = scrollParent;
+		target.addEventListener('scroll', onScroll, { passive: true });
+		window.addEventListener('resize', onScroll, { passive: true });
+		measure();
+		return () => {
+			target.removeEventListener('scroll', onScroll);
+			window.removeEventListener('resize', onScroll);
+		};
+	});
+
+	// Re-measure once data (and therefore the strip height) changes.
+	$effect(() => {
+		void daily;
+		tick().then(measure);
+	});
+
+	// Start scrolled so the "Past" button sits just off the left edge (revealed by
+	// scrolling left), with the first day flush to the content edge — same as the
+	// desktop cards. Runs once per dataset.
+	let scrolledForRef: FetchedDaily | null = null;
+	$effect(() => {
+		const d = daily;
+		if (!d || !canExtendPast || !stripScrollEl || !daysWrapEl || scrolledForRef === d) return;
+		scrolledForRef = d;
+		const scroll = stripScrollEl;
+		const wrap = daysWrapEl;
+		requestAnimationFrame(() => {
+			// 12px = the strip's px-3 left padding, so the first day lands on the edge
+			scroll.scrollLeft +=
+				wrap.getBoundingClientRect().left - scroll.getBoundingClientRect().left - 12;
+		});
+	});
+
+	// ─── Derived sizing ─────────────────────────────────────────────────────────
+	const CELL_W = 64;
+	// Full height fits the whole stack (weekday, label, icon, temps, precip+wind)
+	// without clipping; the horizontal scroll container also clips vertically, so
+	// the content must fit inside the cell.
+	let cellH = $derived(lerp(134, 64));
+	let iconSize = $derived(lerp(40, 20));
+	// Top padding eases from pt-1.5 (6px) when full to pt-0.5 (2px) when compact.
+	let padTop = $derived(lerp(6, 1));
+	// The secondary rows collapse (height + opacity together) faster than the
+	// overall shrink, so the cell reaches a clean square before it stops shrinking.
+	let detailFactor = $derived(clamp(1 - progress * 1.6));
+	let relFactor = $derived(clamp(1 - progress * 2));
+	// Bar background/divider/shadow fade in promptly once it starts collapsing.
+	let chromeOpacity = $derived(clamp(progress / 0.35));
+</script>
+
+<!-- progress sentinel: 0-height marker just above the sticky strip -->
+<div bind:this={sentinelEl} aria-hidden="true"></div>
+
+<div class="daystrip sticky -top-3 z-30 -mx-3 md:hidden" style="--chrome:{chromeOpacity}">
+	<div class="flex gap-1.5 overflow-x-auto px-3 py-2" bind:this={stripScrollEl}>
+		{#if daily}
+			{#if canExtendPast && onExtendPast}
+				<button
+					type="button"
+					class="strip-side flex shrink-0 flex-col items-center justify-center rounded-xl border border-dashed border-border/70 text-muted-foreground"
+					style="width:{CELL_W}px;height:{cellH}px"
+					onclick={onExtendPast}
+					aria-label="Load recent past days"
+				>
+					<svg
+						class="h-5 w-5"
+						fill="none"
+						stroke="currentColor"
+						viewBox="0 0 24 24"
+						stroke-width="1.75"
+					>
+						<path stroke-linecap="round" stroke-linejoin="round" d="M15 6l-6 6 6 6" />
+					</svg>
+					<span class="text-[9px] leading-tight font-semibold">Past</span>
+				</button>
+			{/if}
+
+			<div class="flex gap-1.5" bind:this={daysWrapEl}>
+				{#each daily.dailyDates as time, index (index)}
+					{@const selected = isSameDayInZone(time, selectedDay, daily.timezone)}
+					{@const tempMax = daily.daily.temperature_2m_max[index]}
+					{@const tempMin = daily.daily.temperature_2m_min[index]}
+					{@const wCode = daily.daily.weather_code[index]}
+					{@const precipSum = daily.daily.precipitation_sum[index]}
+					{@const windMax = daily.daily.windspeed_10m_max[index]}
+					{@const maxStyle = getTempStyle(tempMax, String(units.temperature_unit))}
+					{#if tempMax != null && !isNaN(tempMax) && !(tempMax === 0 && tempMin === 0)}
+						<button
+							type="button"
+							class="strip-cell flex shrink-0 cursor-pointer flex-col items-center justify-start gap-0.5 rounded-xl border px-1 pb-1.5 {selected
+								? 'border-primary bg-primary/10 ring-1 ring-primary/50'
+								: 'border-border/60 bg-card'}"
+							style="width:{CELL_W}px;height:{cellH}px;padding-top:{padTop}px"
+							aria-pressed={selected}
+							onclick={() => onSelectDay(time, index)}
+						>
+							<span
+								class="text-[11px] font-semibold tracking-wide {selected ? 'text-primary' : ''}"
+							>
+								{formatZoned(time, daily.timezone, 'EEE').toUpperCase()}
+							</span>
+
+							<span
+								class="overflow-hidden text-[9px] leading-none text-muted-foreground"
+								style="opacity:{relFactor};max-height:{relFactor * 14}px"
+							>
+								{getRelativeDayLabel(time, daily.timezone)}
+							</span>
+
+							<div class="relative">
+								<svg class="fill-foreground" width="{iconSize}px" height="{iconSize}px">
+									<use
+										xlink:href="/images/weather-icons/{getWeatherIconName(wCode, true)}.svg#Layer_1"
+									></use>
+								</svg>
+								<!-- night companion icon, present in the full view, fades as it collapses -->
+								<svg
+									class="absolute -right-1 -bottom-0.5 rounded-full bg-card fill-foreground/60 p-px ring-1 ring-border/60"
+									width="{iconSize * 0.44}px"
+									height="{iconSize * 0.44}px"
+									style="opacity:{relFactor}"
+								>
+									<use
+										xlink:href="/images/weather-icons/{getWeatherIconName(
+											wCode,
+											false
+										)}.svg#Layer_1"
+									></use>
+								</svg>
+							</div>
+
+							<div class="flex items-baseline gap-1 leading-none">
+								<span
+									class="rounded-md px-1.5 py-0.5 text-[12px] font-extrabold tabular-nums"
+									style="background-color:{maxStyle.bg};color:{maxStyle.fg}"
+								>
+									{tempMax.toFixed(0)}°
+								</span>
+								<span class="text-[11px] font-semibold tabular-nums text-muted-foreground">
+									{tempMin.toFixed(0)}°
+								</span>
+							</div>
+
+							<div
+								class="flex w-full flex-col items-center gap-0.5 overflow-hidden text-[10px] tabular-nums text-muted-foreground"
+								style="opacity:{detailFactor};max-height:{detailFactor * 42}px"
+							>
+								<span class="inline-flex items-center gap-1">
+									<svg class="fill-sky-500" width="13" height="13">
+										<use xlink:href="/images/weather-icons/wi-raindrop.svg#Layer_1"></use>
+									</svg>
+									{Number(precipSum ?? 0).toFixed(precipSum >= 10 ? 0 : 1)}
+								</span>
+								<span class="inline-flex items-center gap-1">
+									<svg class="fill-muted-foreground" width="13" height="13">
+										<use xlink:href="/images/weather-icons/wi-strong-wind.svg#Layer_1"></use>
+									</svg>
+									{windMax?.toFixed(0) ?? '-'}
+								</span>
+							</div>
+						</button>
+					{/if}
+				{/each}
+
+				{#if canExtend && onExtend}
+					<button
+						type="button"
+						class="strip-side flex shrink-0 flex-col items-center justify-center rounded-xl border border-dashed border-border/70 text-muted-foreground"
+						style="width:{CELL_W}px;height:{cellH}px"
+						onclick={onExtend}
+						aria-label="Load the longer-range forecast"
+					>
+						<svg
+							class="h-5 w-5"
+							fill="none"
+							stroke="currentColor"
+							viewBox="0 0 24 24"
+							stroke-width="1.75"
+						>
+							<path stroke-linecap="round" stroke-linejoin="round" d="M12 5v14m-7-7h14" />
+						</svg>
+						<span class="text-[9px] leading-tight font-semibold">15d</span>
+					</button>
+				{/if}
+			</div>
+		{/if}
+	</div>
+</div>
+
+<style>
+	/* The bar background/divider/shadow fade in only once the strip has collapsed
+	   into its compact form, so at the top of the page it reads as plain cards. */
+	.daystrip {
+		background: color-mix(
+			in oklab,
+			var(--color-background) calc(var(--chrome) * 100%),
+			transparent
+		);
+		backdrop-filter: blur(calc(var(--chrome) * 6px));
+		border-bottom: 1px solid
+			color-mix(in oklab, var(--color-border) calc(var(--chrome) * 100%), transparent);
+		box-shadow: 0 6px 12px -8px rgba(0, 0, 0, calc(var(--chrome) * 0.35));
+	}
+	.strip-cell,
+	.strip-side {
+		transition:
+			border-color 0.15s,
+			background-color 0.15s;
+	}
+	.daystrip :global(.overflow-x-auto) {
+		scrollbar-width: none;
+	}
+</style>
diff --git a/src/routes/weather/week/[location]/ModelSelector.svelte b/src/routes/weather/week/[location]/ModelSelector.svelte
index c3fa958..c849c93 100644
--- a/src/routes/weather/week/[location]/ModelSelector.svelte
+++ b/src/routes/weather/week/[location]/ModelSelector.svelte
@@ -42,13 +42,19 @@
 >
 	<Select.Trigger
 		aria-label="{label} selection"
-		class="group h-auto min-h-14 min-w-0 flex-1 cursor-pointer gap-3 rounded-xl border-2 border-primary/35 bg-card py-2 ps-2.5 shadow-sm transition-colors hover:border-primary/70 hover:shadow-md data-[size=default]:h-auto data-[state=open]:border-primary sm:min-w-72 sm:flex-none"
+		class="group h-auto min-h-12 min-w-0 flex-1 cursor-pointer gap-2.5 rounded-xl border-2 border-primary/35 bg-card py-1.5 ps-2.5 shadow-sm transition-colors hover:border-primary/70 hover:shadow-md data-[size=default]:h-auto data-[state=open]:border-primary sm:min-h-14 sm:gap-3 sm:py-2 sm:min-w-72 sm:flex-none"
 	>
 		<div
-			class="flex size-9 shrink-0 items-center justify-center rounded-lg bg-primary/12 text-primary"
+			class="flex size-8 shrink-0 items-center justify-center rounded-lg bg-primary/12 text-primary sm:size-9"
 		>
 			<!-- layered-globe icon: weather model -->
-			<svg class="size-5" fill="none" stroke="currentColor" viewBox="0 0 24 24" stroke-width="1.75">
+			<svg
+				class="size-4.5 sm:size-5"
+				fill="none"
+				stroke="currentColor"
+				viewBox="0 0 24 24"
+				stroke-width="1.75"
+			>
 				<circle cx="12" cy="12" r="9" />
 				<path
 					stroke-linecap="round"
@@ -60,9 +66,14 @@
 			<span class="text-[11px] font-semibold tracking-wide text-primary uppercase">
 				{label}
 			</span>
-			<span class="max-w-full truncate text-sm font-bold text-foreground">{modelLabel}</span>
+			<span class="max-w-full truncate text-[13px] font-bold text-foreground sm:text-sm"
+				>{modelLabel}</span
+			>
 			{#if modelMeta}
-				<span class="max-w-full truncate text-[11px] leading-tight text-muted-foreground">
+				<!-- the meta line is dropped on mobile to keep the trigger compact -->
+				<span
+					class="hidden max-w-full truncate text-[11px] leading-tight text-muted-foreground sm:block"
+				>
 					{modelMeta}
 				</span>
 			{/if}
diff --git a/src/routes/weather/week/[location]/variables.ts b/src/routes/weather/week/[location]/variables.ts
index 31bca07..df53a1c 100644
--- a/src/routes/weather/week/[location]/variables.ts
+++ b/src/routes/weather/week/[location]/variables.ts
@@ -496,8 +496,9 @@ export function buildPanelDef(
 		unit: leftKind ? unitForKind(leftKind, units) : '',
 		unitRight: rightKind ? unitForKind(rightKind, units) : undefined,
 		yMin: leftKind && isZeroBased(leftKind) ? 0 : undefined,
-		// pressure sits far from zero, so its axis is derived from the data
-		zeroBaseLeft: leftKind !== 'pressure',
+		// temperature and pressure sit far from zero, so their axis is derived from
+		// the data range (a forced 0 baseline just wastes vertical space)
+		zeroBaseLeft: leftKind ? isZeroBased(leftKind) : true,
 		yMinRight: rightKind && rightZero ? 0 : undefined,
 		yMaxRight: rightKind === 'percent' ? 100 : undefined,
 		hasPictograms: allDefs.some((d) => d.pictograms),