feat(strommix): hero variant, 24h sparkline, trend, polishing

- New "hero" variant between compact and full: pct + status +
  sparkline + trend, no sub-cards or accordion
- 24h Wind+Solar sparkline below hero pct, accent-colored
- Trend arrow vs previous hour with delta percentage points
- Polling pauses on tab hidden, refetches on visibility return
  if last fetch >5min old
- Skeleton loader replaces "Lade…" text (matches final layout)
- Retry button on error state (silent vs explicit fetch)
- Stale-flag now prominent red badge in header bar
- Stand-time wrapped in <time datetime title> for full-date hover
- loadMw=0 falls back to last hourly slot instead of red error
- Negative-price banner replaces standalone price card (dedup)
- Production breakdown grid: clean auto/1fr label-value alignment
- Print CSS: details auto-open, chevrons hidden
- All German strings moved to translation keys
- STROMMIX_DEFAULT_THRESHOLDS const as single source for buckets

Includes data-block="LiveStrommix" attribute for the new
identifier scheme + new RenewableSparkline.svelte component.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/lib/components/blocks/StrommixBlock.svelte

@@ -4,6 +4,7 @@
     import { getBlockLayoutClasses } from "$lib/block-layout";
     import type { LiveStrommixBlockData } from "$lib/block-types";
     import type { StrommixResponse } from "$lib/strommix";
+    import { STROMMIX_DEFAULT_THRESHOLDS } from "$lib/strommix";
     import { useTranslate, T } from "$lib/translations";
     import Icon from "@iconify/svelte";
     import "$lib/iconify-offline";
@@ -12,20 +13,30 @@
     import DunkelflauteCounter from "./strommix/DunkelflauteCounter.svelte";
     import NegPriceCounter from "./strommix/NegPriceCounter.svelte";
     import FlowBalanceTodayYtd from "./strommix/FlowBalanceTodayYtd.svelte";
+    import RenewableSparkline from "./strommix/RenewableSparkline.svelte";
 
     let { block }: { block: LiveStrommixBlockData } = $props();
     const t = useTranslate();
 
     const layoutClasses = $derived(getBlockLayoutClasses(block.layout));
     const isCompact = $derived(block.variant === "compact");
+    const isHero = $derived(block.variant === "hero");
+    /** Variants without sub-cards / accordion / details. Hero & compact
+     *  keep things minimal; full renders the entire dashboard. */
+    const isMinimal = $derived(isCompact || isHero);
 
     // Live data + lifecycle
     let live = $state<StrommixResponse | null>(null);
     let loadError = $state<string | null>(null);
+    let isLoading = $state(false);
     let lastFetchAt = $state<number | null>(null);
     let pollTimer: ReturnType<typeof setInterval> | null = null;
 
-    async function loadLive() {
+    /** Fetch live snapshot. `silent` keeps the existing data on screen
+     *  during a background re-poll; only the first load and explicit
+     *  retries flip `isLoading` so the skeleton appears. */
+    async function loadLive(silent = false) {
+        if (!silent) isLoading = true;
         try {
             const res = await fetch("/api/strommix", { cache: "no-store" });
             if (!res.ok) throw new Error(`HTTP ${res.status}`);
@@ -34,35 +45,115 @@
             loadError = null;
         } catch (e) {
             loadError = e instanceof Error ? e.message : String(e);
+        } finally {
+            if (!silent) isLoading = false;
         }
     }
 
+    /** Re-poll every 5 minutes while the document is visible. Pause on
+     *  hidden tab so embedded/idle widgets don't burn API quota. On show
+     *  trigger an immediate silent refresh if the last fetch is stale
+     *  (>5 min old) so the visitor sees current data, not whatever was
+     *  on screen when they switched away. */
+    function startPolling() {
+        if (pollTimer) return;
+        pollTimer = setInterval(() => loadLive(true), 5 * 60 * 1000);
+    }
+    function stopPolling() {
+        if (pollTimer) {
+            clearInterval(pollTimer);
+            pollTimer = null;
+        }
+    }
+    function handleVisibility() {
+        if (typeof document === "undefined") return;
+        if (document.hidden) {
+            stopPolling();
+            return;
+        }
+        startPolling();
+        const stale = !lastFetchAt || Date.now() - lastFetchAt > 5 * 60 * 1000;
+        if (stale) loadLive(true);
+    }
+
     onMount(() => {
         loadLive();
-        pollTimer = setInterval(loadLive, 5 * 60 * 1000); // re-poll every 5 min
+        startPolling();
+        if (typeof document !== "undefined") {
+            document.addEventListener("visibilitychange", handleVisibility);
+        }
     });
     onDestroy(() => {
-        if (pollTimer) clearInterval(pollTimer);
+        stopPolling();
+        if (typeof document !== "undefined") {
+            document.removeEventListener("visibilitychange", handleVisibility);
+        }
     });
 
+    /** Current Last in MW. Falls back to the most recent history slot
+     *  if the live snapshot lost its load value (SMARD load filter
+     *  occasionally lags behind production). Keeps the % live instead of
+     *  showing the red "Lastdaten fehlen" banner for the brief lag
+     *  window. */
+    const effectiveLoadMw = $derived.by(() => {
+        if (!live) return 0;
+        if (live.loadMw > 0) return live.loadMw;
+        const history = live.todayHourly;
+        if (!history || history.length === 0) return 0;
+        for (let i = history.length - 1; i >= 0; i--) {
+            if (history[i].loadMw > 0) return history[i].loadMw;
+        }
+        return 0;
+    });
+    const usingLoadFallback = $derived(
+        !!live && live.loadMw <= 0 && effectiveLoadMw > 0,
+    );
+
     // Derived numbers
     const renewablePct = $derived.by(() => {
-        if (!live || live.loadMw <= 0) return null;
+        if (!live || effectiveLoadMw <= 0) return null;
-        return (live.weatherRenewableMw / live.loadMw) * 100;
+        return (live.weatherRenewableMw / effectiveLoadMw) * 100;
     });
 
     type Bucket = "dunkelflaute" | "niedrig" | "mittel" | "hoch";
     const bucket = $derived.by((): Bucket | null => {
         if (renewablePct == null) return null;
-        const t1 = block.threshold_dunkelflaute ?? 15;
+        const t1 = block.threshold_dunkelflaute ?? STROMMIX_DEFAULT_THRESHOLDS.dunkelflaute;
-        const t2 = block.threshold_niedrig ?? 35;
+        const t2 = block.threshold_niedrig ?? STROMMIX_DEFAULT_THRESHOLDS.niedrig;
-        const t3 = block.threshold_mittel ?? 60;
+        const t3 = block.threshold_mittel ?? STROMMIX_DEFAULT_THRESHOLDS.mittel;
         if (renewablePct < t1) return "dunkelflaute";
         if (renewablePct < t2) return "niedrig";
         if (renewablePct < t3) return "mittel";
         return "hoch";
     });
 
+    /** Compare current % to the slot one hour back in `todayHourly` to
+     *  give a quick "is it climbing or dropping?" cue alongside the
+     *  status label. Threshold ≥0.5 %-pt to filter flat noise. */
+    type Trend = { direction: "up" | "down" | "flat"; deltaPct: number };
+    const trend = $derived.by((): Trend | null => {
+        if (renewablePct == null || !live?.todayHourly) return null;
+        const slots = live.todayHourly;
+        if (slots.length < 2) return null;
+        const nowUnix = live.measuredAtUnix ?? slots[slots.length - 1].unix;
+        const target = nowUnix - 3600;
+        let prev: typeof slots[number] | null = null;
+        for (let i = slots.length - 1; i >= 0; i--) {
+            if (slots[i].unix <= target && slots[i].loadMw > 0) {
+                prev = slots[i];
+                break;
+            }
+        }
+        if (!prev) return null;
+        const prevPct = (prev.weatherRenewableMw / prev.loadMw) * 100;
+        const delta = renewablePct - prevPct;
+        if (Math.abs(delta) < 0.5) return { direction: "flat", deltaPct: 0 };
+        return {
+            direction: delta > 0 ? "up" : "down",
+            deltaPct: Math.abs(delta),
+        };
+    });
+
     const statusLabel = $derived.by(() => {
         if (!bucket) return "";
         const labels: Record<Bucket, string | undefined> = {
@@ -145,6 +236,22 @@
             minute: "2-digit",
         });
     }
+    function fmtDateTimeAttr(unix: number | null): string {
+        if (!unix) return "";
+        return new Date(unix * 1000).toISOString();
+    }
+    function fmtDateTimeFull(unix: number | null): string {
+        if (!unix) return "";
+        const d = new Date(unix * 1000);
+        return d.toLocaleString("de-DE", {
+            weekday: "short",
+            day: "2-digit",
+            month: "2-digit",
+            year: "numeric",
+            hour: "2-digit",
+            minute: "2-digit",
+        });
+    }
 
     /** Cross-border data is considered stale (and worth flagging) when its
      *  timestamp is more than 30 min behind the production-snapshot. cbpf
@@ -230,10 +337,29 @@
         if (!live) return null;
         return live.netFlowGw >= 0 ? "Export" : "Import";
     });
+
+    /** History-Panels (Residuallast, Dunkelflaute, NegPreis, Flow,
+     *  Capacity-Factor) sind sekundärer Kontext. Im Akkordeon gebündelt
+     *  damit die Hauptkennzahlen oben dominieren — aufklappbar wenn
+     *  Leser mehr Tiefe will. */
+    const hasHistoryPanels = $derived.by(() => {
+        if (!live || isMinimal) return false;
+        return !!(
+            (block.installed_wind_onshore_gw || block.installed_solar_gw) ||
+            (live.todayHourly && live.todayHourly.length > 0) ||
+            live.lastDunkelflaute ||
+            (live.worstDunkelflauten && live.worstDunkelflauten.length > 0) ||
+            live.negPriceHoursYtd != null ||
+            typeof block.einsman_costs_ytd_eur_mio === "number" ||
+            live.crossborderTodayGwh ||
+            live.netCrossborderGwhYtd != null
+        );
+    });
 </script>
 
 <div
     class="live-strommix {layoutClasses}"
+    data-block="LiveStrommix"
     data-block-type="live_strommix"
     data-block-slug={block._slug}
 >
@@ -303,7 +429,7 @@
              Source-Badge zeigt klar woher die zahlen kommen ohne dass
              man die Detail-Aufklappkachel öffnen muss. -->
         <div
-            class="flex flex-wrap items-center gap-x-3 gap-y-1 justify-between px-4 py-2 border-b border-current/10 text-xs font-semibold {accentClasses.label}"
+            class="flex flex-wrap items-center gap-x-3 gap-y-1 justify-between px-4 py-1.5 border-b border-current/10 text-xs font-semibold {accentClasses.label}"
         >
             <span class="inline-flex items-center gap-1.5 uppercase tracking-wide">
                 <Icon
@@ -315,6 +441,12 @@
             </span>
             {#if live}
                 <span class="inline-flex items-center gap-2 normal-case font-normal">
+                    {#if isStale}
+                        <span class="inline-flex items-center gap-1 rounded-full px-2 py-0.5 text-[10px] uppercase tracking-wide bg-fire-700 text-fire-50">
+                            <Icon icon="mdi:cloud-off-outline" class="size-3" aria-hidden="true" />
+                            {t(T.strommix_stale_badge)}
+                        </span>
+                    {:else}
                         <span class="inline-flex items-center gap-1 rounded-full px-2 py-0.5 text-[10px] uppercase tracking-wide {accentClasses.badge}">
                             <Icon icon="mdi:database-outline" class="size-3" aria-hidden="true" />
                             {#if live.dataSource === "smard"}
@@ -325,26 +457,47 @@
                                 Energy-Charts
                             {/if}
                         </span>
+                    {/if}
                     {#if live.measuredAtUnix}
-                        <span>
+                        <time
+                            datetime={fmtDateTimeAttr(live.measuredAtUnix)}
+                            title={fmtDateTimeFull(live.measuredAtUnix)}
+                        >
                             {t(T.strommix_stand, { time: fmtTime(live.measuredAtUnix) })}
-                        </span>
+                        </time>
                     {/if}
                 </span>
             {/if}
         </div>
 
         <!-- Main: percentage + status -->
-        {#if loadError}
+        {#if loadError && !live}
-            <div class="p-6 text-sm text-fire-700">
+            <div class="p-6 text-sm text-fire-700 flex flex-wrap items-center gap-3">
+                <Icon icon="mdi:alert-circle-outline" class="size-5 shrink-0" aria-hidden="true" />
+                <span class="flex-1 min-w-0">
                     {t(T.strommix_load_error, { error: loadError })}
+                </span>
+                <button
+                    type="button"
+                    class="inline-flex items-center gap-1 rounded-xs border border-fire-300 bg-fire-100 px-3 py-1 text-xs font-semibold text-fire-800 hover:bg-fire-200 disabled:opacity-50"
+                    onclick={() => loadLive()}
+                    disabled={isLoading}
+                >
+                    <Icon icon="mdi:refresh" class="size-3.5 {isLoading ? 'animate-spin' : ''}" aria-hidden="true" />
+                    {t(T.strommix_retry)}
+                </button>
             </div>
         {:else if !live}
-            <div class="p-6 text-center text-stein-500 text-sm">
+            <!-- Skeleton: matches the final layout's footprint so the
-                {t(T.strommix_loading)}
+                 % drop-in doesn't shift the rest of the page. -->
+            <div class="p-4 sm:p-6 text-center" aria-busy="true" aria-live="polite">
+                <div class="strommix-skel mx-auto h-16 sm:h-20 w-44 sm:w-56 rounded-xs bg-stein-200/70"></div>
+                <div class="strommix-skel mx-auto mt-3 h-3 w-40 rounded-xs bg-stein-200/60"></div>
+                <div class="strommix-skel mx-auto mt-2 h-4 w-32 rounded-xs bg-stein-200/60"></div>
+                <span class="sr-only">{t(T.strommix_loading)}</span>
             </div>
         {:else}
-            <div class="p-6 sm:p-8 text-center">
+            <div class="p-4 sm:p-6 text-center">
                 {#if renewablePct != null}
                     <!-- Key change keys the % display so a fresh fetch
                          triggers a brief CSS fade-in transition. The
@@ -352,26 +505,47 @@
                          supports it. -->
                     {#key live.measuredAtUnix}
                         <div
-                            class="strommix-pct text-7xl sm:text-8xl font-bold tabular-nums leading-none {accentClasses.pct}"
+                            class="strommix-pct text-5xl sm:text-7xl font-bold tabular-nums leading-none {accentClasses.pct}"
                         >
                             {Math.round(renewablePct)}%
                         </div>
                     {/key}
-                    <div class="mt-2 text-sm sm:text-base text-stein-700">
+                    <div class="mt-1.5 text-sm text-stein-700">
                         {t(T.strommix_wind_solar_share)}
                     </div>
                     <div
-                        class="mt-3 text-lg font-semibold {accentClasses.label}"
+                        class="mt-2 text-base font-semibold {accentClasses.label}"
                     >
                         → {statusLabel}
                     </div>
-                    {#if argumentHtml}
+                    {#if trend}
+                        <div class="mt-1 text-[11px] text-stein-500 tabular-nums">
+                            {#if trend.direction === "up"}
+                                {t(T.strommix_trend_up, { delta: trend.deltaPct.toFixed(1).replace(".", ",") })}
+                            {:else if trend.direction === "down"}
+                                {t(T.strommix_trend_down, { delta: trend.deltaPct.toFixed(1).replace(".", ",") })}
+                            {:else}
+                                {t(T.strommix_trend_flat)}
+                            {/if}
+                        </div>
+                    {/if}
+                    {#if live.todayHourly && live.todayHourly.length >= 2}
+                        <div class="mt-2 {accentClasses.label}">
+                            <RenewableSparkline points={live.todayHourly} accent="currentColor" />
+                        </div>
+                    {/if}
+                    {#if argumentHtml && !isHero}
                         <div
                             class="prose prose-xs mt-2 max-w-md mx-auto text-xs leading-snug text-stein-700 [&_p]:my-1"
                         >
                             {@html argumentHtml}
                         </div>
                     {/if}
+                    {#if usingLoadFallback}
+                        <div class="mt-2 text-[11px] text-stein-500 italic">
+                            {t(T.strommix_load_missing)}
+                        </div>
+                    {/if}
                 {:else}
                     <!-- Production data arrived but load is missing → no percentage,
                but we still show what we have so the widget isn't blank. -->
@@ -386,21 +560,23 @@
 
     <!-- Context cards: konventionell + saldo, je eigenes box-block.
          Stack mobile, side-by-side ab sm. Kein farbakzent damit haupt-
-         karte mit %-zahl optisch dominiert. -->
+         karte mit %-zahl optisch dominiert. Hero-Variante zeigt nur
-    {#if live}
+         Hauptzahl + Sparkline; sub-cards würden den minimalen Charakter
-        <div class="mt-3 grid grid-cols-1 gap-3 sm:grid-cols-2">
+         brechen. -->
-            <div class="rounded-xs border border-stein-200 bg-white px-4 py-3 text-sm shadow-sm">
+    {#if live && !isHero}
+        <div class="mt-2 grid grid-cols-1 gap-2 sm:grid-cols-2">
+            <div class="rounded-xs border border-stein-200 bg-white px-4 py-2.5 text-sm shadow-sm">
                 <div class="text-xs text-stein-600 uppercase tracking-wide">
                     {t(T.strommix_conventional_now)}
                 </div>
-                <div class="text-2xl font-semibold tabular-nums text-stein-900">
+                <div class="text-xl font-semibold tabular-nums text-stein-900">
                     {fmtMw(live.conventionalMw)}
                 </div>
-                <div class="text-[11px] text-stein-500 mt-1">
+                <div class="text-[11px] text-stein-500 mt-0.5">
                     {t(T.strommix_conventional_formula)}
                 </div>
             </div>
-            <div class="rounded-xs border border-stein-200 bg-white px-4 py-3 text-sm shadow-sm">
+            <div class="rounded-xs border border-stein-200 bg-white px-4 py-2.5 text-sm shadow-sm">
                 <div class="text-xs text-stein-600 uppercase tracking-wide">
                     {importDirection === "Import"
                         ? t(T.strommix_import)
@@ -408,16 +584,21 @@
                           ? t(T.strommix_export)
                           : t(T.strommix_saldo)}
                 </div>
-                <div class="text-2xl font-semibold tabular-nums text-stein-900">
+                <div class="text-xl font-semibold tabular-nums text-stein-900">
                     {#if importDirection === "Import"}↓{/if}
                     {#if importDirection === "Export"}↑{/if}
                     {fmtGw(live.netFlowGw)}
                 </div>
                 {#if live.crossborderMeasuredAtUnix}
-                    <div class="text-[11px] text-stein-500 mt-1">
+                    <div class="text-[11px] text-stein-500 mt-0.5">
+                        <time
+                            datetime={fmtDateTimeAttr(live.crossborderMeasuredAtUnix)}
+                            title={fmtDateTimeFull(live.crossborderMeasuredAtUnix)}
+                        >
                             {t(T.strommix_stand, {
                                 time: fmtTime(live.crossborderMeasuredAtUnix),
                             })}
+                        </time>
                         {#if cbStale}<span class="text-fire-700">
                                 · {t(T.strommix_delayed)}</span
                             >{/if}
@@ -426,10 +607,50 @@
             </div>
         </div>
 
-        <!-- Price card — separater block, full-width damit der vergleich
+        {#if (live.priceDeEurMwh ?? 0) < 0}
-             DE/FR + slot-info nicht in den 2-spaltigen flow oben gepresst
+            <!-- Negativpreis-warnung als eigener prominenter banner statt
-             werden muss. -->
+                 inline-badge. Greift wenn Day-Ahead-Preis negativ — sehr
-        <div class="mt-3 rounded-xs border border-stein-200 bg-white px-4 py-3 text-sm shadow-sm">
+                 aussagekräftiger marktzustand der nicht versteckt werden
+                 sollte. Ersetzt die separate Price-Card komplett, weil
+                 derselbe Preis sonst zweimal genannt würde. -->
+            <div class="mt-2 flex items-start gap-3 rounded-xs border-2 border-fire-500 bg-fire-50 px-4 py-2.5 text-sm shadow-sm">
+                <Icon
+                    icon="mdi:alert-circle"
+                    class="size-6 shrink-0 text-fire-700"
+                    aria-hidden="true"
+                />
+                <div class="min-w-0 flex-1">
+                    <div class="flex flex-wrap items-baseline gap-x-3 gap-y-0.5">
+                        <span class="text-base font-bold text-fire-800">
+                            {t(T.strommix_negative_price)}: {fmtPrice(live.priceDeEurMwh)}
+                        </span>
+                        {#if enableFr && live.priceFrEurMwh != null}
+                            <span class="text-xs text-fire-900/70">
+                                {t(T.strommix_price_fr_inline, { price: fmtPrice(live.priceFrEurMwh) })}
+                            </span>
+                        {/if}
+                        {#if live.priceMeasuredAtUnix}
+                            <span class="text-[11px] text-fire-900/60">
+                                · <time
+                                    datetime={fmtDateTimeAttr(live.priceMeasuredAtUnix)}
+                                    title={fmtDateTimeFull(live.priceMeasuredAtUnix)}
+                                >{t(T.strommix_slot, { time: fmtTime(live.priceMeasuredAtUnix) })}</time>
+                            </span>
+                        {/if}
+                    </div>
+                    {#if showDisclaimer}
+                        <div class="mt-1 text-xs leading-snug text-fire-900/80 prose prose-xs max-w-none [&_p]:my-0">
+                            {@html disclaimerHtml}
+                        </div>
+                    {/if}
+                </div>
+            </div>
+        {:else}
+            <!-- Price card — separater block, full-width damit DE/FR-
+                 Vergleich + Slot-Info sauber nebeneinander stehen. Bei
+                 Negativpreisen unterdrückt; der Negativbanner oben zeigt
+                 dann denselben Preis prominenter. -->
+            <div class="mt-2 rounded-xs border border-stein-200 bg-white px-4 py-2 text-sm shadow-sm">
                 <div class="flex flex-wrap items-baseline gap-x-4 gap-y-1">
                     <span class="font-semibold">
                         {t(T.strommix_price_de, { price: fmtPrice(live.priceDeEurMwh) })}
@@ -441,42 +662,73 @@
                     {/if}
                     {#if live.priceMeasuredAtUnix}
                         <span class="text-[11px] text-stein-500">
-                        · {t(T.strommix_slot, { time: fmtTime(live.priceMeasuredAtUnix) })}
+                            · <time
+                                datetime={fmtDateTimeAttr(live.priceMeasuredAtUnix)}
+                                title={fmtDateTimeFull(live.priceMeasuredAtUnix)}
+                            >{t(T.strommix_slot, { time: fmtTime(live.priceMeasuredAtUnix) })}</time>
                         </span>
                     {/if}
                 </div>
             </div>
+        {/if}
+    {/if}
 
-        <!-- Negativpreis-warnung als eigener prominenter banner statt
+    <!-- History-Panels gebündelt im Akkordeon: Residuallast,
-             inline-badge. Greift wenn Day-Ahead-Preis negativ — sehr
+         Dunkelflaute, Negativpreise, Cross-Border, Capacity-Factor.
-             aussagekräftiger marktzustand der nicht versteckt werden
+         Default zu — Hauptkennzahlen oben sollen dominieren. -->
-             sollte. -->
+    {#if live && hasHistoryPanels}
-        {#if (live.priceDeEurMwh ?? 0) < 0}
+        <details class="strommix-history mt-3 group">
-            <div class="mt-3 flex items-start gap-3 rounded-xs border-2 border-fire-500 bg-fire-50 px-4 py-3 text-sm shadow-sm">
+            <summary class="cursor-pointer rounded-xs border border-stein-200 bg-white px-4 py-2 text-sm font-semibold text-stein-700 shadow-sm hover:bg-stein-50 inline-flex items-center gap-2">
-                <Icon
+                <Icon icon="mdi:chevron-right" class="size-4 transition-transform group-open:rotate-90" aria-hidden="true" />
-                    icon="mdi:alert-circle"
+                {t(T.strommix_history_summary)}
-                    class="size-6 shrink-0 text-fire-700"
+            </summary>
-                    aria-hidden="true"
+
+            {#if live.todayHourly && live.todayHourly.length > 0}
+                <div class="mt-2 rounded-xs border border-stein-200 bg-white px-4 py-2.5 shadow-sm">
+                    <h4 class="text-sm font-semibold text-stein-800">
+                        {t(T.strommix_residual_today_title)}
+                    </h4>
+                    <p class="mt-0.5 text-[11px] text-stein-600">
+                        {t(T.strommix_residual_today_desc)}
+                    </p>
+                    <div class="mt-2">
+                        <ResidualLoadChart points={live.todayHourly} />
+                    </div>
+                </div>
+            {/if}
+
+            {#if live.lastDunkelflaute || (live.worstDunkelflauten && live.worstDunkelflauten.length > 0)}
+                <div class="mt-2 rounded-xs border border-stein-200 bg-white px-4 py-2.5 shadow-sm">
+                    <DunkelflauteCounter
+                        last={live.lastDunkelflaute}
+                        worst={live.worstDunkelflauten}
                     />
-                <div class="min-w-0">
-                    <div class="text-base font-bold text-fire-800">
-                        {t(T.strommix_negative_price)}: {fmtPrice(live.priceDeEurMwh)}
                 </div>
-                    {#if showDisclaimer}
-                        <div class="mt-1 text-xs leading-snug text-fire-900/80 prose prose-xs max-w-none [&_p]:my-0">
-                            {@html disclaimerHtml}
-                        </div>
-                    {/if}
-                </div>
-            </div>
-        {/if}
             {/if}
 
-    <!-- Capacity-factor bars: live vs. installiert. Nur full-Variante; in
+            {#if live.negPriceHoursYtd != null || typeof block.einsman_costs_ytd_eur_mio === "number"}
-         compact wäre's optisch zu dicht. Renders nur, wenn Stammdaten
+                <div class="mt-2 rounded-xs border border-stein-200 bg-white px-4 py-2.5 shadow-sm">
-         gesetzt sind. -->
+                    <NegPriceCounter
-    {#if live && !isCompact && (block.installed_wind_onshore_gw || block.installed_solar_gw)}
+                        negHoursYtd={live.negPriceHoursYtd}
-        <div class="mt-4 rounded-xs border border-stein-200 bg-white px-4 py-3 shadow-sm">
+                        einsmanEurMio={block.einsman_costs_ytd_eur_mio ?? null}
+                        einsmanAsOf={block.einsman_costs_as_of}
+                    />
+                </div>
+            {/if}
+
+            {#if live.crossborderTodayGwh || live.netCrossborderGwhYtd != null}
+                <div class="mt-2 rounded-xs border border-stein-200 bg-white px-4 py-2.5 shadow-sm">
+                    <FlowBalanceTodayYtd
+                        today={live.crossborderTodayGwh}
+                        ytd={live.netCrossborderGwhYtd != null && live.crossborderByCountryGwhYtd
+                            ? { total: live.netCrossborderGwhYtd, perCountry: live.crossborderByCountryGwhYtd }
+                            : null}
+                    />
+                </div>
+            {/if}
+
+            {#if block.installed_wind_onshore_gw || block.installed_solar_gw}
+                <div class="mt-2 rounded-xs border border-stein-200 bg-white px-4 py-2.5 shadow-sm">
                     <CapacityFactorBars
                         windOnshoreLiveMw={live.windOnshoreMw}
                         windOffshoreLiveMw={live.windOffshoreMw}
@@ -488,72 +740,26 @@
                     />
                 </div>
             {/if}
-
+        </details>
-    <!-- Residuallast-Kurve heute: Last minus Wind+Solar. Nur full-Variante,
-         und nur wenn der Aggregator Historien-Daten geliefert hat (CMS mit
-         history-mode-Schema im Hintergrund — sonst null). -->
-    {#if live && !isCompact && live.todayHourly && live.todayHourly.length > 0}
-        <div class="mt-4 rounded-xs border border-stein-200 bg-white px-4 py-3 shadow-sm">
-            <h4 class="text-sm font-semibold text-stein-800">
-                Residuallast heute
-            </h4>
-            <p class="mt-0.5 text-[11px] text-stein-600">
-                Last minus Wind+Solar im Tagesverlauf. Die schraffierte Lücke
-                füllen konventionelle Kraftwerke und Importe.
-            </p>
-            <div class="mt-2">
-                <ResidualLoadChart points={live.todayHourly} />
-            </div>
-        </div>
-    {/if}
-
-    <!-- Dunkelflaute-Counter: letzte Phase + Top-5 Liste. Nur full-Variante.
-         Renders nur, wenn Aggregator History-Daten + qualifying runs hat. -->
-    {#if live && !isCompact && (live.lastDunkelflaute || (live.worstDunkelflauten && live.worstDunkelflauten.length > 0))}
-        <div class="mt-4 rounded-xs border border-stein-200 bg-white px-4 py-3 shadow-sm">
-            <DunkelflauteCounter
-                last={live.lastDunkelflaute}
-                worst={live.worstDunkelflauten}
-            />
-        </div>
-    {/if}
-
-    <!-- Negativpreis- + EinsMan-Counter. Nur full. Renders wenn entweder
-         History-Aggregat oder hand-gepflegte EinsMan-Zahl vorhanden. -->
-    {#if live && !isCompact && (live.negPriceHoursYtd != null || typeof block.einsman_costs_ytd_eur_mio === "number")}
-        <div class="mt-4 rounded-xs border border-stein-200 bg-white px-4 py-3 shadow-sm">
-            <NegPriceCounter
-                negHoursYtd={live.negPriceHoursYtd}
-                einsmanEurMio={block.einsman_costs_ytd_eur_mio ?? null}
-                einsmanAsOf={block.einsman_costs_as_of}
-            />
-        </div>
-    {/if}
-
-    <!-- Cross-Border-Bilanz: heute + YTD pro Land. Nur full, nur wenn
-         History-Daten da sind. -->
-    {#if live && !isCompact && (live.crossborderTodayGwh || live.netCrossborderGwhYtd != null)}
-        <div class="mt-4 rounded-xs border border-stein-200 bg-white px-4 py-3 shadow-sm">
-            <FlowBalanceTodayYtd
-                today={live.crossborderTodayGwh}
-                ytd={live.netCrossborderGwhYtd != null && live.crossborderByCountryGwhYtd
-                    ? { total: live.netCrossborderGwhYtd, perCountry: live.crossborderByCountryGwhYtd }
-                    : null}
-            />
-        </div>
     {/if}
 
     <!-- Production breakdown: aufklappbar damit user die Summe nachvollziehen
-       kann. Werte sind aufeinander abgestimmt (gleicher SMARD-15-min-Slot). -->
+       kann. Werte sind aufeinander abgestimmt (gleicher SMARD-15-min-Slot).
-    {#if live}
+       Hero-Variante kapselt den minimalen Modus — Detail-Aufklapper würde
+       das brechen. -->
+    {#if live && !isHero}
         <details class="mt-3 text-xs">
             <summary
                 class="cursor-pointer text-stein-600 hover:text-stein-900"
             >
                 {t(T.strommix_check_values)}
             </summary>
+            <!-- grid: label/value-Paare als zwei klar getrennte Spalten
+                 (auto / 1fr) statt grid-cols-2 — sonst alterniert das
+                 Mapping pro Zelle und wirkt unruhig. Auf sm doppelt: 2
+                 Paare nebeneinander. -->
             <div
-                class="mt-2 grid grid-cols-2 gap-x-4 gap-y-1 rounded-xs border border-stein-200 bg-stein-50 px-3 py-2 tabular-nums sm:grid-cols-3"
+                class="mt-2 grid grid-cols-[auto_1fr] gap-x-3 gap-y-1 rounded-xs border border-stein-200 bg-stein-50 px-3 py-2 tabular-nums sm:grid-cols-[auto_1fr_auto_1fr] sm:gap-x-4"
             >
                 <div class="text-stein-500">
                     {t(T.strommix_field_wind_onshore)}
@@ -664,4 +870,30 @@
     .live-strommix [class*="border-stein"] {
         transition: background-color 350ms ease, border-color 350ms ease, color 350ms ease;
     }
+    /* Skeleton placeholder pulse — matches widget rhythm so the
+       loading state doesn't feel like a hang. */
+    .strommix-skel {
+        animation: strommix-skel-pulse 1400ms ease-in-out infinite;
+    }
+    @keyframes strommix-skel-pulse {
+        0%, 100% { opacity: 0.6; }
+        50% { opacity: 1; }
+    }
+    @media (prefers-reduced-motion: reduce) {
+        .strommix-skel { animation: none; }
+    }
+    /* Print: open all <details> children so the printed page shows
+       the full picture, not just the summary chevron. The chevron
+       itself is hidden — it's only meaningful interactively. */
+    @media print {
+        .live-strommix details > *:not(summary) {
+            display: block !important;
+        }
+        .live-strommix details > summary {
+            list-style: none;
+        }
+        .live-strommix details > summary > :global(svg) {
+            display: none;
+        }
+    }
 </style>

src/lib/components/blocks/strommix/RenewableSparkline.svelte

@@ -0,0 +1,91 @@
+<script lang="ts">
+    import type { ResidualLoadPoint } from "$lib/strommix";
+    import { useTranslate, T } from "$lib/translations";
+
+    /** Daily per-slot data — the sparkline plots `weatherRenewableMw / loadMw`
+     *  per slot. Compact, decorative, sits below the hero %. */
+    let {
+        points,
+        accent = "currentColor",
+    }: { points: ResidualLoadPoint[]; accent?: string } = $props();
+    const t = useTranslate();
+
+    const W = 240;
+    const H = 36;
+    const PAD = 2;
+
+    const series = $derived.by(() => {
+        return points
+            .filter((p) => p.loadMw > 0)
+            .map((p) => ({
+                unix: p.unix,
+                pct: (p.weatherRenewableMw / p.loadMw) * 100,
+            }));
+    });
+
+    const range = $derived.by(() => {
+        if (series.length === 0) return { minX: 0, maxX: 1, minY: 0, maxY: 100 };
+        const xs = series.map((s) => s.unix);
+        const ys = series.map((s) => s.pct);
+        return {
+            minX: Math.min(...xs),
+            maxX: Math.max(...xs),
+            minY: Math.max(0, Math.min(...ys) - 5),
+            maxY: Math.min(100, Math.max(...ys) + 5),
+        };
+    });
+
+    function xOf(unix: number): number {
+        const span = range.maxX - range.minX || 1;
+        return PAD + ((unix - range.minX) / span) * (W - 2 * PAD);
+    }
+    function yOf(pct: number): number {
+        const span = range.maxY - range.minY || 1;
+        return PAD + (1 - (pct - range.minY) / span) * (H - 2 * PAD);
+    }
+
+    const linePath = $derived.by(() => {
+        if (series.length < 2) return "";
+        return series
+            .map(
+                (s, i) => `${i === 0 ? "M" : "L"} ${xOf(s.unix).toFixed(1)} ${yOf(s.pct).toFixed(1)}`,
+            )
+            .join(" ");
+    });
+
+    const areaPath = $derived.by(() => {
+        if (series.length < 2) return "";
+        const top = linePath;
+        const last = series[series.length - 1];
+        const first = series[0];
+        return `${top} L ${xOf(last.unix).toFixed(1)} ${(H - PAD).toFixed(1)} L ${xOf(first.unix).toFixed(1)} ${(H - PAD).toFixed(1)} Z`;
+    });
+
+    const ariaLabel = $derived.by(() => {
+        if (series.length === 0) return "";
+        return t(T.strommix_sparkline_aria, {
+            from: Math.round(series[0].pct),
+            to: Math.round(series[series.length - 1].pct),
+        });
+    });
+</script>
+
+{#if series.length >= 2}
+    <svg
+        viewBox="0 0 {W} {H}"
+        preserveAspectRatio="none"
+        class="strommix-sparkline w-full max-w-[240px] h-9 mx-auto"
+        role="img"
+        aria-label={ariaLabel}
+    >
+        <path d={areaPath} fill={accent} fill-opacity="0.15" />
+        <path
+            d={linePath}
+            stroke={accent}
+            stroke-width="1.5"
+            fill="none"
+            stroke-linecap="round"
+            stroke-linejoin="round"
+        />
+    </svg>
+{/if}

src/lib/strommix.ts

@@ -6,6 +6,16 @@
  * consumes it.
  */
 
+/** Default percentage thresholds (Wind+Solar / Last × 100) for bucket
+ *  classification. Single source of truth — both the CMS schema
+ *  (`live_strommix.json5`) and the block (`StrommixBlock.svelte`) read
+ *  these. Editor can override per-instance via `threshold_*` fields. */
+export const STROMMIX_DEFAULT_THRESHOLDS = {
+  dunkelflaute: 15,
+  niedrig: 35,
+  mittel: 60,
+} as const;
+
 export type StrommixResponse = {
   // Production-snapshot timestamp (Unix sec) — used as the "anchor" for
   // the rest of the values. Cross-border + prices may have their own,

src/lib/translations.ts

@@ -114,6 +114,28 @@ const TRANSLATION_KEYS = [
   "calendar_time_suffix",
   "calendar_select_day",
   "calendar_next_events",
+  "calendar_all_upcoming",
+  "calendar_today",
+  "calendar_tomorrow",
+  "calendar_in_days",                // {{n}}
+  "calendar_no_future_events",
+  "calendar_clear_filter",
+  "calendar_event_count",            // {{n}}
+  "calendar_add_to_google",
+  "calendar_download_ics",
+  "calendar_open_maps",
+  "calendar_show_past",
+  "calendar_hide_past",
+  "calendar_past_events",
+  "calendar_filter_by_tag",
+  "calendar_all_tags",
+  "calendar_multi_day_range",        // {{from}}, {{to}}
+  "calendar_starts_in",               // {{n}}
+  "calendar_starts_in_minutes",       // {{n}}
+  "calendar_running_now",
+  "calendar_jump_to_month",
+  "calendar_today_marker",
+  "calendar_untitled",
   "calendar_show_more",
   "calendar_show_less",
   "post_overview_all",
@@ -207,6 +229,17 @@ const TRANSLATION_KEYS = [
   // Compact variant for homepage / sidebar.
   "strommix_compact_label",         // {{pct}}, {{status}}
   "strommix_compact_more",
+  // Akkordeon + history-panel headings.
+  "strommix_history_summary",
+  "strommix_residual_today_title",
+  "strommix_residual_today_desc",
+  // Loading / error UX.
+  "strommix_retry",
+  "strommix_trend_up",               // {{delta}}
+  "strommix_trend_down",             // {{delta}}
+  "strommix_trend_flat",
+  "strommix_sparkline_aria",         // {{from}}, {{to}}
+  "strommix_stale_badge",
 ] as const;
 
 export type TranslationKey = (typeof TRANSLATION_KEYS)[number];