scroll behaviour

.gitignore

@@ -23,3 +23,6 @@ vite.config.js.timestamp-*
 vite.config.ts.timestamp-*
 
 AGENTS.md
+
+# Local agent/editor config
+.claude/

src/lib/components/ui/button/button.svelte

@@ -6,7 +6,7 @@
 	import type { HTMLAnchorAttributes, HTMLButtonAttributes } from 'svelte/elements';
 
 	export const buttonVariants = tv({
-		base: "focus-visible:border-ring focus-visible:ring-ring/50 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive inline-flex shrink-0 items-center justify-center gap-2 rounded-md text-sm font-medium whitespace-nowrap transition-all outline-none focus-visible:ring-[3px] disabled:pointer-events-none disabled:opacity-50 aria-disabled:pointer-events-none aria-disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
+		base: "focus-visible:border-ring focus-visible:ring-ring/50 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive inline-flex shrink-0 cursor-pointer items-center justify-center gap-2 rounded-md text-sm font-medium whitespace-nowrap transition-all outline-none focus-visible:ring-[3px] disabled:pointer-events-none disabled:opacity-50 aria-disabled:pointer-events-none aria-disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
 		variants: {
 			variant: {
 				default: 'bg-primary text-primary-foreground hover:bg-primary/90 shadow-xs',

src/routes/weather/week/[location]/DailyCards.svelte

@@ -57,8 +57,10 @@
 		// defer to after layout so the measured positions and scroll width are final
 		requestAnimationFrame(() => {
 			// scroll so the first day card sits exactly at the content edge (aligned
-			// with the page hero), leaving the "past days" button fully off to the left
-			el.scrollLeft += wrap.getBoundingClientRect().left - el.getBoundingClientRect().left;
+			// with the page hero), leaving the "past days" button fully off to the
+			// left. The scroll's pl-3 keeps the lifted/scaled card from being clipped,
+			// so subtract it here to land the card on the content edge.
+			el.scrollLeft += wrap.getBoundingClientRect().left - el.getBoundingClientRect().left - 12;
 		});
 	});
 
@@ -129,7 +131,7 @@
 	     clipped, while the first card still lines up with the page content edge. -->
 	<div
 		bind:this={scrollEl}
-		class="day-scroll flex min-w-0 flex-1 gap-2 overflow-x-auto pt-3 pb-3 md:pt-5 md:pb-11"
+		class="day-scroll -ml-3 flex min-w-0 flex-1 gap-2 overflow-x-auto pt-3 pb-3 pl-3 md:pt-5 md:pb-11"
 		class:scrolling
 		onscroll={onScroll}
 	>

src/routes/weather/week/[location]/HourlyTable.svelte

@@ -281,32 +281,66 @@
 			: null
 	);
 
-	// ─── Start the scroll at 06:00 on day change (mobile) ───────────────────────
-	// When the table overflows sideways, scroll so the 06:00 column is the leftmost
-	// visible one — the early hours are rarely of interest and this keeps the
-	// daytime in view on every day switch.
+	// ─── Auto-scroll the (overflowing) table on day / interval change ────────────
+	// • Day change → today lands on the current-hour cell, other days on 06:00.
+	// • Interval change (3h ↔ 1h) → keep whatever cell is currently on the left.
 	let tableScrollEl = $state<HTMLDivElement>();
 	let autoScrolledDay = -1;
+	let lastInterval = 0;
+	let viewLeftHour = 6; // zoned hour at the left edge (plain, non-reactive)
+
+	function colWidthPx(): number {
+		return (tableWidth - headerColWidth) / cellData.length;
+	}
+
+	function scrollToIdx(idx: number) {
+		const el = tableScrollEl;
+		if (!el) return;
+		if (el.scrollWidth <= el.clientWidth + 4) {
+			el.scrollLeft = 0;
+			return;
+		}
+		el.scrollLeft = idx <= 0 ? 0 : Math.max(0, idx * colWidthPx());
+	}
+
+	// track the left-most visible cell's hour so an interval switch can restore it
+	function onTableScroll() {
+		const el = tableScrollEl;
+		if (!el || cellData.length === 0 || tableWidth === 0) return;
+		const idx = Math.min(
+			cellData.length - 1,
+			Math.max(0, Math.round(el.scrollLeft / colWidthPx()))
+		);
+		viewLeftHour = getZonedHour(cellData[idx].date, data.timezone);
+	}
+
 	$effect(() => {
-		const day = selectedDay.getTime(); // re-run on day switch
+		const day = selectedDay.getTime();
+		const interval = is3h ? 3 : 1;
 		const el = tableScrollEl;
 		if (!el || cellData.length === 0 || tableWidth === 0 || headerColWidth === 0) return;
-		if (autoScrolledDay === day) return;
+		const dayChanged = autoScrolledDay !== day;
+		const intervalChanged = lastInterval !== interval;
+		if (!dayChanged && !intervalChanged) return;
 		autoScrolledDay = day;
-		requestAnimationFrame(() => {
-			// only when it actually overflows (i.e. mobile / narrow)
-			if (el.scrollWidth <= el.clientWidth + 4) {
-				el.scrollLeft = 0;
-				return;
-			}
-			const sixIdx = cellData.findIndex((c) => getZonedHour(c.date, data.timezone) >= 6);
-			if (sixIdx <= 0) {
-				el.scrollLeft = 0;
-				return;
-			}
-			const colWidth = (tableWidth - headerColWidth) / cellData.length;
-			el.scrollLeft = Math.max(0, sixIdx * colWidth);
-		});
+		lastInterval = interval;
+
+		let targetIdx: number;
+		if (dayChanged) {
+			// today → the cell whose block contains "now"; otherwise → 06:00
+			const nowMs = today.getTime();
+			const stepMs = interval * 3600 * 1000;
+			const nowIdx = cellData.findIndex(
+				(c) => nowMs >= c.date.getTime() && nowMs < c.date.getTime() + stepMs
+			);
+			targetIdx =
+				nowIdx >= 0 ? nowIdx : cellData.findIndex((c) => getZonedHour(c.date, data.timezone) >= 6);
+			viewLeftHour = targetIdx >= 0 ? getZonedHour(cellData[targetIdx].date, data.timezone) : 6;
+		} else {
+			// interval change only: keep the same cell on the left
+			targetIdx = cellData.findIndex((c) => getZonedHour(c.date, data.timezone) >= viewLeftHour);
+		}
+		requestAnimationFrame(() => scrollToIdx(targetIdx));
 	});
 
 	// ─── Chart-hover mirror ─────────────────────────────────────────────────────
@@ -415,7 +449,7 @@
 
 		<!-- Below the min-width the table scrolls sideways instead of squeezing;
 		     1h needs far more room than 3h (24 vs 8 columns) -->
-		<div class="overflow-x-auto" bind:this={tableScrollEl}>
+		<div class="overflow-x-auto" bind:this={tableScrollEl} onscroll={onTableScroll}>
 			<div
 				class="relative {is3h ? 'min-w-[560px]' : 'min-w-[1100px]'}"
 				bind:clientWidth={tableWidth}