From b998b0b34af87f2ebc032a70ad803aa41f151e77 Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Thu, 1 Oct 2026 00:48:29 +0300
Subject: [PATCH] feat(moon): the moon with any background, and its status in
 General settings (#718)
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Content-Transfer-Encoding: 8bit

The owner decided on 30.09 that the moon is not part of the "Follow the Sun"
environment but a switch of its own: with a static background (global or a
space's own) the card showed no moon even with the switch on, and the switch
said nothing about why the moon was missing right now.

With a static background there is no environment, so the moon stands in its
own layer, `.hp-moon-sky`: the first child of `.stage` / `.hp-static-stage`,
the whole scene, no z-index, filter or will-change, under the plan by DOM
order, fading with the #101 View weight. Inside is the very #661 element, so
place, size, art and fades are unchanged, and a background switch moves it to
its new parent in the same render without a flicker. The phase comes from the
same `resolveDayCycle`, computed only while the moon is on and on View; without
`sun.sun` both cards keep their 30 s clock ticker and re-render only when the
phase changes (the environment is still compared by its whole fingerprint).

General settings get a second caption line under the moon switch
(`data-moon-status`): one snapshot per opening, judged by the lazy chunk as if
the switch were on, first reason wins (no home, day, below 3°, under 3 %),
numbers rounded and clamped below the threshold they missed. `moonStatus`
decides "shown" with the same `moonShownAt` as the element. It lives in a
WeakMap beside the draft, so it never makes the dialog dirty; a closed
opening's result is dropped. The dialog loads the chunk through the gate's
loader (`withMoon`), now shared by every caller while a load is in flight, so
there is still one fingerprint check and one retry token.

Bundle (same build, against origin/dev): initial View 300 072 -> 300 248 B gzip
(+176 B, under the 500 B of the spec; budget and ceiling not raised); lazy
editor 238 558 -> 238 991 B (+433 B, the line and English strings); lazy moon
11 385 -> 11 712 B (+327 B, layer CSS and status). `src/moon.ts` stays out of
the initial and the editor graph; bundle-budget now refuses an editor/moon
overlap. Monolith metrics: hostRefs 4 885 -> 4 888 — the three `host.` reads of
`src/editors/moon-status.ts` (hass, `_settingsDialog`, requestUpdate) through
its own three-member interface, not the editor port; the other five metrics
are unchanged. houseplan-editor-runtime.ts grows by two lines (import, call).

Tests: AC9/AC10/AC15 and the sky layer in test/moon.test.mjs (the #661
"static -> nothing" check inverted), AC14 and the opening lifecycle in
test/moon-settings.test.mjs, smokes demo/smoke_moon_static.mjs (AC1-AC6; AC1
and AC3 were red on dev) and demo/smoke_moon_status.mjs (AC11/AC12), AC7 in
smoke_daycycle_layer_budget. Golden: two new scenes
(static-bg-moon-gibbous-white-light, static-bg-moon-crescent-south-dark,
matrix v70), the harness checks the moon's parent by background and waits for
the status line in the General settings frames. Four new mutants; the clock
ticker one is a browser guard (201 at the guideline of 200).

Issue: #718
User-Visible: yes
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018qZfe7YS4rqEMKoVeS3GKd
---
 demo/golden/harness.mjs                       |  33 +-
 demo/golden/matrix.mjs                        |  16 +-
 demo/smoke_daycycle_layer_budget.mjs          |  29 ++
 demo/smoke_moon_static.mjs                    | 389 ++++++++++++++++++
 demo/smoke_moon_status.mjs                    | 200 +++++++++
 docs/CHANGELOG.md                             |  11 +
 docs/CHANGELOG.ru.md                          |  11 +
 docs/CONFIG-COMPATIBILITY.md                  |  21 +-
 docs/SUN.md                                   | 116 ++++--
 docs/USER-GUIDE.md                            |  45 +-
 docs/USER-GUIDE.ru.md                         |  46 ++-
 docs/testing-notes/mutation-browser-guards.md |   5 +-
 scripts/bundle-budget.mjs                     |   5 +
 scripts/mutation-registry.mjs                 |  56 ++-
 scripts/smoke-links.mjs                       |   7 +-
 src/editors/general-settings-dialog.ts        |   8 +-
 src/editors/moon-status.ts                    |  68 +++
 src/houseplan-card.ts                         |  18 +-
 src/houseplan-editor-runtime.ts               |   2 +
 src/i18n/settings/de.json                     |   8 +-
 src/i18n/settings/en.json                     |   8 +-
 src/i18n/settings/fr.json                     |   8 +-
 src/i18n/settings/ru.json                     |   8 +-
 src/moon-gate.ts                              |  86 +++-
 src/moon-runtime.ts                           |  51 ++-
 src/moon.ts                                   |  74 +++-
 src/space-card.ts                             |  23 +-
 src/space-render.ts                           |  10 +-
 test/bundle-assets.test.mjs                   |   6 +
 test/golden-matrix.test.mjs                   |  32 +-
 test/moon-settings.test.mjs                   | 112 ++++-
 test/moon.test.mjs                            | 185 ++++++++-
 tsconfig.test.json                            |   2 +-
 33 files changed, 1553 insertions(+), 146 deletions(-)
 create mode 100644 demo/smoke_moon_static.mjs
 create mode 100644 demo/smoke_moon_status.mjs
 create mode 100644 src/editors/moon-status.ts

diff --git a/demo/golden/harness.mjs b/demo/golden/harness.mjs
index 00139dec..026825c9 100644
--- a/demo/golden/harness.mjs
+++ b/demo/golden/harness.mjs
@@ -686,7 +686,7 @@ export function prepareGoldenFixture(scenario) {
       throw new Error(`golden deviceName references missing device: ${scenario.deviceId || '<empty>'}`);
     fixture.devices[scenario.deviceId].name = scenario.deviceName;
   }
-  if (scenario.fillMode || scenario.bgMode || typeof scenario.glowEnabled === 'boolean'
+  if (scenario.fillMode || scenario.bgMode || scenario.bgColor || typeof scenario.glowEnabled === 'boolean'
       || typeof scenario.sunRays === 'boolean' || typeof scenario.showBorders === 'boolean'
       || typeof scenario.showNames === 'boolean'
       || typeof scenario.northDeg === 'number') {
@@ -695,6 +695,8 @@ export function prepareGoldenFixture(scenario) {
       ...(space.settings || {}),
       ...(scenario.fillMode ? { fill_mode: scenario.fillMode } : {}),
       ...(scenario.bgMode ? { bg_mode: scenario.bgMode } : {}),
+      // #718: the scene colour of a static background, deterministic in both themes.
+      ...(scenario.bgColor ? { bg_color: scenario.bgColor } : {}),
       ...(typeof scenario.glowEnabled === 'boolean' ? { glow_enabled: scenario.glowEnabled } : {}),
       ...(typeof scenario.sunRays === 'boolean' ? { sun_rays: scenario.sunRays } : {}),
       ...(typeof scenario.showBorders === 'boolean' ? { show_borders: scenario.showBorders } : {}),
@@ -933,6 +935,23 @@ export async function prepareGoldenScenario(page, scenario) {
       await card.updateComplete;
       await frame();
     };
+    /**
+     * #718 AC8: General settings grow a status line under the moon switch once
+     * the lazy moon chunk judged the opening. Wait for it, so the frame does
+     * not depend on the chunk's timing; at phone width it wraps, it never
+     * scrolls the dialog sideways.
+     */
+    const moonStatusSettled = async (card) => {
+      await until(() => !!card.renderRoot.querySelector('hp-dialog [data-moon-status]'));
+      await card.updateComplete;
+      await frame();
+      const dialog = card.renderRoot.querySelector('hp-dialog');
+      const body = dialog?.querySelector('.body');
+      if (innerWidth <= 390 && (!dialog || dialog.scrollWidth > dialog.clientWidth + 1
+          || (body && body.scrollWidth > body.clientWidth + 1))) {
+        throw new Error(`golden general-settings dialog overflows horizontally: ${scenario.id}`);
+      }
+    };
     const settleCamera = async (card) => {
       await until(() => !card._cameraTransition?.active, 1500);
       await card.updateComplete;
@@ -2022,6 +2041,7 @@ export async function prepareGoldenScenario(page, scenario) {
     } else if (scenario.dialog === 'general-color') {
       card._openSettingsDialog();
       await card.updateComplete;
+      await moonStatusSettled(card);
       const dialog = card.renderRoot.querySelector('hp-dialog');
       const picker = [...(dialog?.querySelectorAll('hp-color-opacity') || [])]
         .find((item) => item.label === card._t('gs.light_on'));
@@ -2035,6 +2055,7 @@ export async function prepareGoldenScenario(page, scenario) {
     } else if (scenario.dialog === 'general-help') {
       card._openSettingsDialog();
       await card.updateComplete;
+      await moonStatusSettled(card);
       const dialog = card.renderRoot.querySelector('hp-dialog');
       const help = dialog?.querySelector(`hp-help[data-help-key="${scenario.openHelp}"]`);
       await help?.updateComplete;
@@ -2216,7 +2237,15 @@ export async function prepareGoldenScenario(page, scenario) {
       // The moon chunk is lazy: wait for it, then for the expected phase.
       await until(() => card.renderRoot.querySelector('.hp-moon')?.dataset.moonVisible === 'true');
       const moon = card.renderRoot.querySelector('.hp-moon');
-      if (moon.dataset.moonK !== scenario.moon.k || moon.parentElement !== card.renderRoot.querySelector('.hp-day-cycle-env')) {
+      // #718: over "Follow the Sun" the moon is in the environment; over a
+      // static background in its own sky layer, the first child of the scene.
+      const stage = card.renderRoot.querySelector('.stage');
+      const parent = scenario.bgMode === 'daynight'
+        ? card.renderRoot.querySelector('.hp-day-cycle-env')
+        : card.renderRoot.querySelector('.hp-moon-sky');
+      const staticSky = scenario.bgMode === 'daynight' || (stage?.firstElementChild === parent
+        && !card.renderRoot.querySelector('.hp-day-cycle-env'));
+      if (moon.dataset.moonK !== scenario.moon.k || !parent || moon.parentElement !== parent || !staticSky) {
         throw new Error(`golden moon contract did not render: ${scenario.id} (k ${moon.dataset.moonK})`);
       }
       await frame();
diff --git a/demo/golden/matrix.mjs b/demo/golden/matrix.mjs
index 36b48021..979e7523 100644
--- a/demo/golden/matrix.mjs
+++ b/demo/golden/matrix.mjs
@@ -1,7 +1,7 @@
 import { fixtureWallKey } from '../fixtures/visual-matrix.mjs';
 
 /** Data-only HP-QA-01 capture matrix. Bump when framing or scenarios change. */
-export const GOLDEN_MATRIX_VERSION = 69;
+export const GOLDEN_MATRIX_VERSION = 70;
 
 const stage = { capture: 'stage', threshold: { maxChannelDelta: 10, maxDiffRatio: 0.0005 } };
 const page = { capture: 'page', threshold: { maxChannelDelta: 10, maxDiffRatio: 0.0008 } };
@@ -562,6 +562,20 @@ export const GOLDEN_SCENARIOS = Object.freeze([
     moon: { clock: '2026-10-14T09:00:00Z', latitude: -33.87, longitude: 151.21, k: '0.14' },
     stateOverrides: { 'sun.sun': { attributes: { azimuth: 265, elevation: -2, rising: false } } },
     theme: 'dark', viewport: { width: 1000, height: 900 }, ...stage },
+  // #718 AC8: the moon with a static background — its own sky layer at the
+  // top-left of the scene, the plan over part of the disc, the chosen scene
+  // colour around the plan unchanged. White in the light theme, dark grey in
+  // the dark one; the same art and lit side as over "Follow the Sun".
+  { id: 'static-bg-moon-gibbous-white-light', fixture: 'visual', space: 'golden-geometry', mode: 'view',
+    bgMode: 'static', bgColor: '#ffffff',
+    moon: { clock: '2026-10-21T18:00:00Z', latitude: 55.75, longitude: 37.62, k: '0.79' },
+    stateOverrides: { 'sun.sun': { attributes: { azimuth: 0, elevation: -12, rising: false } } },
+    theme: 'light', viewport: { width: 1000, height: 900 }, ...stage },
+  { id: 'static-bg-moon-crescent-south-dark', fixture: 'visual', space: 'golden-geometry', mode: 'view',
+    bgMode: 'static', bgColor: '#202126',
+    moon: { clock: '2026-10-14T09:00:00Z', latitude: -33.87, longitude: 151.21, k: '0.14' },
+    stateOverrides: { 'sun.sun': { attributes: { azimuth: 265, elevation: -2, rising: false } } },
+    theme: 'dark', viewport: { width: 1000, height: 900 }, ...stage },
   { id: 'geometry-plan-editor-dark', fixture: 'visual', space: 'golden-geometry', mode: 'plan',
     theme: 'dark', viewport: { width: 1180, height: 900 }, ...page },
   { id: 'safe-resize-handles-clamp-light', fixture: 'visual', space: 'golden-safe-resize',
diff --git a/demo/smoke_daycycle_layer_budget.mjs b/demo/smoke_daycycle_layer_budget.mjs
index dd175ca3..cfef3af4 100644
--- a/demo/smoke_daycycle_layer_budget.mjs
+++ b/demo/smoke_daycycle_layer_budget.mjs
@@ -242,6 +242,31 @@ await page.waitForFunction(() => !!window.__card.renderRoot.querySelector('.hp-m
 await transitionsDone();
 const moonLayers = (await layerSnapshot()).layers;
 
+// #718 AC7: a static background at night — the moon stands in its own sky
+// layer (no z-index, filter or will-change) and adds no composited layer
+// either. Night without the moon against night with it, both settled.
+const setStaticMoon = (moon) => page.evaluate(async (moon) => {
+  const card = window.__card;
+  card._serverCfg = { ...card._serverCfg, settings: { ...card._serverCfg.settings, bg_mode: 'static', moon } }; // private-ok: the synthetic 1 cm/point space exists only in the card config, a server push would reload the demo plan
+  card.requestUpdate();
+  await card.updateComplete;
+}, moon);
+await setStaticMoon(false);
+await settle();
+await transitionsDone();
+const staticNightLayers = (await layerSnapshot()).layers;
+await setStaticMoon(true);
+await page.waitForFunction(() => !!window.__card.renderRoot.querySelector('.hp-moon-sky > .hp-moon.on'), null, { timeout: 8000 });
+await transitionsDone();
+const staticMoonLayers = (await layerSnapshot()).layers;
+await page.evaluate(async () => {
+  const card = window.__card;
+  card._serverCfg = { ...card._serverCfg, settings: { ...card._serverCfg.settings, bg_mode: 'daynight', moon: true } }; // private-ok: back to the #661 night for the static card below
+  card.requestUpdate();
+  await card.updateComplete;
+});
+await settle();
+
 // Contract item 6: the non-interactive houseplan-space-card never needs a
 // gesture to become safe. Its day-cycle silhouette is stage-bounded from its
 // first frame, while the visible paper group owns no filter layer.
@@ -370,6 +395,8 @@ checks.staticCardOutlineLayerIsStageBounded = !!staticOutlineLayer
 checks.staticCardHasNo4096ContentLayer = staticOversized.length === 0;
 checks.moonAddsNoCompositedLayer = moonLayers.length === nightLayers.length
   && !moonLayers.some((layer) => layer.className.includes('hp-moon'));
+checks.staticMoonAddsNoCompositedLayer = staticMoonLayers.length === staticNightLayers.length
+  && !staticMoonLayers.some((layer) => layer.className.includes('hp-moon'));
 
 console.log(JSON.stringify({
   stage: active.stage,
@@ -389,6 +416,8 @@ console.log(JSON.stringify({
   staticOversized,
   nightLayers: nightLayers.length,
   moonLayers: moonLayers.length,
+  staticNightLayers: staticNightLayers.length,
+  staticMoonLayers: staticMoonLayers.length,
 }, null, 2));
 checkAll(checks);
 await cdp.send('LayerTree.disable');
diff --git a/demo/smoke_moon_static.mjs b/demo/smoke_moon_static.mjs
new file mode 100644
index 00000000..ebd74b64
--- /dev/null
+++ b/demo/smoke_moon_static.mjs
@@ -0,0 +1,389 @@
+// #718 AC1–AC6: the moon with any background, in the production bundle. With
+// a static background there is no environment: the moon stands in its own
+// layer `.hp-moon-sky`, the first child of the scene, under the plan by DOM
+// order. The home is Moscow through `hass.config`; the clock is Playwright's
+// (`page.clock`), the time zone the context's (`timezoneId`).
+//
+// Moscow 2026-10-21 18:00Z: the moon at 23.9°, 79 % lit; 2026-10-03 07:59Z:
+// 31.5°, 53 %. AC1 and AC3 are the witnesses: red on the #661 code, where a
+// static background leaves no moon at all.
+import { launch, checkAll, finish } from './serve.mjs';
+
+const MOSCOW = { latitude: 55.75, longitude: 37.62 };
+const NIGHT_SUN = { azimuth: 0, elevation: -12, rising: false };
+const DAY_SUN = { azimuth: 180, elevation: 40, rising: false };
+const checks = {};
+const report = {};
+const isMoonAsset = (url) => /\/moon-runtime-[^/?]*\.js(?:\?|$)/.test(url);
+
+async function open(contextOptions = {}) {
+  const run = await launch({ width: 1000, height: 760 }, 1, [], contextOptions);
+  run.moonRequests = [];
+  run.page.on('request', (request) => { if (isMoonAsset(request.url())) run.moonRequests.push(request.url()); });
+  return run;
+}
+
+/** A state update, as Home Assistant pushes one; `sun: null` removes `sun.sun`. */
+const pushHass = (page, { config, sun } = {}) => page.evaluate(async ({ config, sun }) => {
+  const card = window.__card;
+  const states = { ...card.hass.states };
+  if (sun === null) delete states['sun.sun'];
+  else if (sun) {
+    states['sun.sun'] = {
+      entity_id: 'sun.sun', state: sun.elevation > 0 ? 'above_horizon' : 'below_horizon', attributes: sun,
+    };
+  }
+  card.hass = {
+    ...card.hass,
+    ...(config ? { config: { ...(card.hass.config || {}), ...config } } : {}),
+    states,
+  };
+  await card.updateComplete;
+}, { config, sun });
+
+/**
+ * Another client's save: global settings merged (`null` removes a key), every
+ * space's own `bg_mode` dropped, then `spaces[id]` applied to that space.
+ */
+const setConfig = (page, settings, spaces = {}) => page.evaluate(({ settings, spaces }) => (
+  window.__hpTest.setServerConfig((cfg) => {
+    cfg.settings = { ...(cfg.settings || {}), ...settings };
+    for (const [key, value] of Object.entries(settings)) if (value === null) delete cfg.settings[key];
+    for (const space of cfg.spaces) {
+      space.settings = { ...(space.settings || {}) };
+      delete space.settings.bg_mode;
+      Object.assign(space.settings, spaces[space.id] || {});
+    }
+    return cfg;
+  })), { settings, spaces });
+
+const moonState = (page) => page.evaluate(() => {
+  const root = window.__card.renderRoot;
+  const stage = root.querySelector('.stage');
+  const moons = root.querySelectorAll('.hp-moon');
+  const moon = moons[0] || null;
+  const style = moon ? getComputedStyle(moon) : null;
+  const box = moon?.getBoundingClientRect();
+  return {
+    count: moons.length,
+    on: !!moon?.classList.contains('on'),
+    opacity: style ? Number(style.opacity) : null,
+    k: moon?.dataset.moonK ?? null,
+    parent: moon?.parentElement?.className ?? null,
+    parentIsFirstChild: !!moon && moon.parentElement === stage.firstElementChild,
+    sky: root.querySelectorAll('.hp-moon-sky').length,
+    env: !!root.querySelector('.hp-day-cycle-env'),
+    outline: !!root.querySelector('.hp-paper-outline-svg'),
+    stageClasses: [...stage.classList].filter((name) => name === 'daycycle' || name.startsWith('phase-')),
+    stageBg: getComputedStyle(stage).backgroundColor,
+    box: box ? [box.left, box.top, box.width, box.height] : null,
+    running: moon ? moon.getAnimations()
+      .filter((animation) => animation instanceof CSSTransition && animation.playState === 'running').length : 0,
+    pointerEvents: style?.pointerEvents ?? null,
+  };
+});
+const settle = (page) => page.evaluate(async () => {
+  await window.__card.updateComplete;
+  await new Promise((done) => requestAnimationFrame(() => requestAnimationFrame(done)));
+});
+/** Soft wait: a missing moon is a named red check, not an aborted run. */
+const until = (page, predicate, arg, timeout = 8000) => page.waitForFunction(predicate, arg, { timeout })
+  .then(() => true, () => false);
+const moonOn = () => !!window.__card.renderRoot.querySelector('.hp-moon.on');
+const sameBox = (a, b) => !!a && !!b && a.every((value, index) => Math.abs(value - b[index]) <= 1);
+
+// ─── Part A: full card, `sun.sun` from Home Assistant (AC1, AC2, AC4, AC5) ───
+{
+  const { page, browser, moonRequests } = await open();
+  await page.clock.setFixedTime(new Date('2026-10-21T18:00:00Z'));
+  await pushHass(page, { config: MOSCOW, sun: NIGHT_SUN });
+  await setConfig(page, { bg_mode: 'static', moon: null });
+  await settle(page);
+  await page.waitForTimeout(400);
+  const moonOff = await moonState(page);
+  // AC2: night with the moon switched off asks for nothing.
+  checks.ac2_nightMoonOffNoChunk = moonOff.count === 0 && moonRequests.length === 0;
+
+  // AC2: switched on by day — no moon and still no request.
+  await pushHass(page, { sun: DAY_SUN });
+  await setConfig(page, { bg_mode: 'static', moon: true });
+  await settle(page);
+  await page.waitForTimeout(400);
+  const day = await moonState(page);
+  checks.ac2_dayNoMoonNoChunk = !day.on && moonRequests.length === 0;
+
+  // AC2: the state update at night brings the moon.
+  await pushHass(page, { sun: NIGHT_SUN });
+  checks.ac2_nightPushShowsTheMoon = await until(page, moonOn);
+  const first = await moonState(page);
+  report.ac1 = { moonOff, first, requests: moonRequests.length };
+
+  // AC1 (witness): one moon in its own layer, the first child of the scene.
+  checks.ac1_oneMoonOnAtFullOpacity = first.count === 1 && first.on && first.opacity === 1;
+  checks.ac1_parentIsTheSkyLayer = first.sky === 1 && first.parent === 'hp-moon-sky' && first.parentIsFirstChild;
+  checks.ac1_noEnvironment = !first.env && !first.outline && first.stageClasses.length === 0;
+  checks.ac1_backgroundUnchanged = first.stageBg === moonOff.stageBg;
+  checks.ac1_moonIgnoresThePointer = first.pointerEvents === 'none';
+
+  // AC1: the #661 probe along the disc's diameter — under the plan the moon
+  // changes no pixel, in the open it does.
+  const probe = await page.evaluate(() => {
+    const root = window.__card.renderRoot;
+    const moon = root.querySelector('.hp-moon');
+    if (!moon) return { covered: null, open: null, cy: 0 };
+    const box = moon.getBoundingClientRect();
+    const cy = Math.round(box.top + box.height / 2);
+    const disc = box.width * 0.47;
+    let covered = null;
+    let open = null;
+    for (let x = box.left + box.width / 2 - disc * 0.9; x <= box.left + box.width / 2 + disc * 0.9; x += 2) {
+      const hit = root.elementFromPoint(x, cy);
+      const svg = hit?.closest('svg.plan-svg');
+      if (svg && hit !== svg) covered ??= Math.round(x);
+      else if (!svg || hit === svg) open ??= Math.round(x);
+    }
+    return { covered, open, cy };
+  });
+  const pixel = async (x, y) => (await page.screenshot({ clip: { x, y, width: 1, height: 1 } })).toString('base64');
+  const pixels = async () => ({
+    covered: probe.covered === null ? null : await pixel(probe.covered, probe.cy),
+    open: probe.open === null ? null : await pixel(probe.open, probe.cy),
+  });
+  const shown = await pixels();
+  await page.evaluate(() => {
+    const style = document.createElement('style');
+    style.id = 'hp-moon-probe';
+    style.textContent = '.hp-moon{visibility:hidden!important}';
+    window.__card.renderRoot.appendChild(style);
+  });
+  const hidden = await pixels();
+  await page.evaluate(() => window.__card.renderRoot.querySelector('#hp-moon-probe')?.remove());
+  report.ac1.probe = probe;
+  checks.ac1_planCoversPartOfTheDisc = probe.covered !== null && probe.open !== null;
+  checks.ac1_noPixelChangesUnderThePlan = shown.covered !== null && shown.covered === hidden.covered;
+  checks.ac1_moonPaintedWhereThePlanIsNot = shown.open !== null && shown.open !== hidden.open;
+
+  // AC2: daytime again — the moon fades out over 2 s.
+  await pushHass(page, { sun: DAY_SUN });
+  await page.waitForTimeout(250);
+  const fading = await moonState(page);
+  await page.waitForTimeout(2050);
+  const gone = await moonState(page);
+  report.ac2 = { day, fading, gone };
+  checks.ac2_dayFades = fading.count === 1 && !fading.on && fading.opacity > 0 && fading.opacity < 1;
+  checks.ac2_dayFadesToZero = gone.count === 1 && gone.opacity === 0;
+
+  // AC4: global "Follow the Sun", the garden has its own static background.
+  await pushHass(page, { sun: NIGHT_SUN });
+  await setConfig(page, { bg_mode: 'daynight', moon: true }, { garden: { bg_mode: 'static' } });
+  await page.evaluate(() => window.__hpTest.switchSpace('f1'));
+  await until(page, moonOn);
+  await page.waitForTimeout(2200);
+  const inEnv = await moonState(page);
+  const tabs = [];
+  for (const id of ['garden', 'f1', 'garden', 'f1']) {
+    await page.evaluate((space) => window.__hpTest.switchSpace(space), id);
+    await settle(page);
+    tabs.push({ id, ...(await moonState(page)) });
+  }
+  report.ac4 = { inEnv, tabs };
+  checks.ac4_startsInsideTheEnvironment = inEnv.count === 1 && inEnv.on && inEnv.parent === 'hp-day-cycle-env';
+  checks.ac4_tabsKeepOneMoonInItsPlace = tabs.every((tab) => tab.count === 1 && tab.on && tab.opacity === 1
+    && tab.parent === (tab.id === 'garden' ? 'hp-moon-sky' : 'hp-day-cycle-env')
+    && sameBox(tab.box, inEnv.box) && tab.running === 0);
+
+  // AC4: the background segment previewed in the open General settings.
+  await page.evaluate(async () => { window.__card._openSettingsDialog(); await window.__card.updateComplete; });
+  const pick = (value) => page.evaluate(async (value) => {
+    const card = window.__card;
+    const input = card.renderRoot.querySelector(`hp-dialog input[name="gs-bg-mode"][value="${value}"]`);
+    input?.click();
+    await card.updateComplete;
+    return !!input;
+  }, value);
+  const segmentFound = await pick('static');
+  await settle(page);
+  const previewed = await moonState(page);
+  await pick('daynight');
+  await settle(page);
+  const restored = await moonState(page);
+  await page.evaluate(async () => {
+    const dialog = window.__card.renderRoot.querySelector('hp-dialog[data-kind="settings"]');
+    if (dialog) await window.__hpTest.close(dialog);
+  });
+  report.ac4.previewed = previewed;
+  checks.ac4_segmentPreviewKeepsTheMoon = segmentFound && previewed.count === 1 && previewed.on
+    && previewed.opacity === 1 && previewed.parent === 'hp-moon-sky' && sameBox(previewed.box, inEnv.box)
+    && previewed.running === 0;
+  checks.ac4_segmentBackKeepsTheMoon = restored.count === 1 && restored.on
+    && restored.parent === 'hp-day-cycle-env' && sameBox(restored.box, inEnv.box);
+
+  // AC5: static background, View → plan editor and back (#101 transition).
+  await setConfig(page, { bg_mode: 'static', moon: true });
+  await settle(page);
+  checks.ac5_staticMoonBeforeTheEditor = await until(page,
+    () => window.__card.renderRoot.querySelector('.hp-moon.on')?.parentElement?.className === 'hp-moon-sky');
+  const sample = () => page.evaluate(() => {
+    const card = window.__card;
+    window.__hpSkySamples = [];
+    window.__hpSkyStop = false;
+    const loop = () => {
+      const root = card.renderRoot;
+      const sky = root.querySelector('.hp-moon-sky');
+      const moon = root.querySelector('.hp-moon');
+      const stage = root.querySelector('.stage');
+      window.__hpSkySamples.push({
+        busy: !!card._modeTransitionBusy,
+        weight: Number(getComputedStyle(stage).getPropertyValue('--hp-mode-view-weight')),
+        sky: sky ? Number(getComputedStyle(sky).opacity) : null,
+        moon: moon ? { on: moon.classList.contains('on'), opacity: Number(getComputedStyle(moon).opacity) } : null,
+      });
+      if (!window.__hpSkyStop) requestAnimationFrame(loop);
+    };
+    requestAnimationFrame(loop);
+  });
+  const stopSampling = () => page.evaluate(() => { window.__hpSkyStop = true; return window.__hpSkySamples; });
+  await sample();
+  await page.evaluate(() => window.__hpTest.setMode('plan'));
+  await settle(page);
+  const toEditor = await stopSampling();
+  const inEditor = await moonState(page);
+  await sample();
+  await page.evaluate(() => window.__hpTest.setMode('view'));
+  await settle(page);
+  const toView = await stopSampling();
+  const backInView = await moonState(page);
+  const between = toEditor.filter((frame) => frame.sky !== null && frame.weight > 0 && frame.weight < 1);
+  const firstBack = toView.find((frame) => frame.moon);
+  report.ac5 = { between: between.length, toEditor: toEditor.length, inEditor, firstBack, backInView };
+  checks.ac5_skyFollowsTheViewWeight = between.length > 0
+    && toEditor.every((frame) => frame.sky === null || Math.abs(frame.sky - frame.weight) <= 0.02);
+  checks.ac5_noMoonInTheEditor = inEditor.count === 0 && inEditor.sky === 0;
+  checks.ac5_backInViewAtOnce = !!firstBack && firstBack.moon.on && firstBack.moon.opacity === 1
+    && backInView.on && backInView.opacity === 1 && backInView.parent === 'hp-moon-sky';
+  await browser.close();
+}
+
+// ─── Part B: the browser clock, no `sun.sun`, UTC (AC3) ───
+{
+  const { page, browser, moonRequests } = await open({ timezoneId: 'UTC' });
+  await page.clock.install({ time: new Date('2026-10-21T17:59:00Z') });
+  await pushHass(page, { config: MOSCOW, sun: null });
+  await setConfig(page, { bg_mode: 'static', moon: true });
+  await settle(page);
+  await page.waitForTimeout(400);
+  const before = await moonState(page);
+  checks.ac3_dayByTheClockNoMoonNoChunk = !before.on && moonRequests.length === 0;
+  // Witness: only the card's own clock ticker can bring the moon at 18:00.
+  await page.clock.runFor(90_000);
+  const dusk = await until(page, moonOn);
+  const evening = await moonState(page);
+  checks.ac3_duskByTheClockShowsTheMoon = dusk && evening.count === 1 && evening.k === '0.79'
+    && evening.parent === 'hp-moon-sky';
+  await page.clock.setSystemTime(new Date('2026-10-03T07:59:00Z'));
+  await page.clock.runFor(30_000);
+  const dawnShown = await until(page,
+    () => window.__card.renderRoot.querySelector('.hp-moon.on')?.dataset.moonK === '0.53');
+  const dawn = await moonState(page);
+  checks.ac3_dawnByTheClockShowsTheMoon = dawnShown && dawn.on && dawn.k === '0.53';
+  await page.clock.runFor(60_000);
+  const dayHides = await until(page, () => {
+    const moon = window.__card.renderRoot.querySelector('.hp-moon');
+    return !!moon && !moon.classList.contains('on');
+  });
+  checks.ac3_dayByTheClockHidesTheMoon = dayHides;
+  report.ac3 = { before, evening, dawn, requests: moonRequests.length };
+  await browser.close();
+}
+
+// ─── Part C: houseplan-space-card with its own static background (AC6) ───
+{
+  const { page, browser } = await open({ timezoneId: 'UTC' });
+  await page.clock.install({ time: new Date('2026-10-21T18:00:00Z') });
+  await setConfig(page, { bg_mode: 'daynight', moon: true }, { f1: { bg_mode: 'static' } });
+  await page.evaluate(async ({ config, sun }) => {
+    await customElements.whenDefined('houseplan-space-card');
+    const full = window.__card;
+    full.style.display = 'none';
+    const host = document.createElement('div');
+    host.style.cssText = 'position:fixed;left:0;top:0;width:820px';
+    document.body.appendChild(host);
+    const card = document.createElement('houseplan-space-card');
+    card.setConfig({ type: 'custom:houseplan-space-card', space: 'f1', title: '', show_button: false });
+    card.hass = {
+      ...full.hass,
+      config: { ...(full.hass.config || {}), ...config },
+      states: { ...full.hass.states, 'sun.sun': { entity_id: 'sun.sun', state: 'below_horizon', attributes: sun } },
+    };
+    host.appendChild(card);
+    window.__hpSpaceCard = card;
+  }, { config: MOSCOW, sun: NIGHT_SUN });
+  const spaceMoon = () => page.evaluate(() => {
+    const card = window.__hpSpaceCard;
+    const moon = card.renderRoot?.querySelector('.hp-static-stage > .hp-moon-sky > .hp-moon');
+    return {
+      count: card.renderRoot?.querySelectorAll('.hp-moon').length ?? 0,
+      nested: !!moon,
+      firstChild: !!moon && moon.parentElement === moon.parentElement.parentElement.firstElementChild,
+      on: !!moon?.classList.contains('on'),
+      k: moon?.dataset.moonK ?? null,
+      env: !!card.renderRoot?.querySelector('.hp-day-cycle-env'),
+    };
+  });
+  const spaceOn = () => !!window.__hpSpaceCard?.renderRoot?.querySelector('.hp-static-stage > .hp-moon-sky > .hp-moon.on');
+  const nightShown = await until(page, spaceOn);
+  const night = await spaceMoon();
+  checks.ac6_spaceCardMoonInTheSkyLayer = nightShown && night.count === 1 && night.nested && night.firstChild
+    && !night.env;
+  // Stacking: with both hit-testable, the plan wins over the part of the disc it covers.
+  const stacking = await page.evaluate(() => {
+    const root = window.__hpSpaceCard.renderRoot;
+    if (!root?.querySelector('.hp-moon')) return { plan: 0, disc: 0 };
+    const style = document.createElement('style');
+    style.id = 'hp-moon-hit';
+    style.textContent = '.hp-static-plan-svg *,.hp-moon,.hp-moon *{pointer-events:auto!important}';
+    root.appendChild(style);
+    const moon = root.querySelector('.hp-moon');
+    const box = moon.getBoundingClientRect();
+    const r = box.width * 0.47 * 0.9;
+    const cx = box.left + box.width / 2;
+    const cy = box.top + box.height / 2;
+    let plan = 0;
+    let disc = 0;
+    for (let y = cy - r; y <= cy + r; y += 3) {
+      for (let x = cx - r; x <= cx + r; x += 3) {
+        if ((x - cx) ** 2 + (y - cy) ** 2 > r * r) continue;
+        const hit = root.elementFromPoint(x, y);
+        if (hit?.closest('.hp-static-plan-svg')) plan++;
+        else if (hit?.closest('.hp-moon')) disc++;
+      }
+    }
+    style.remove();
+    return { plan, disc };
+  });
+  report.ac6 = { night, stacking };
+  checks.ac6_planCoversPartOfTheDisc = stacking.plan > 0 && stacking.disc > 0;
+  const pushSpace = (sun) => page.evaluate(async (sun) => {
+    const card = window.__hpSpaceCard;
+    const states = { ...card.hass.states };
+    if (sun) states['sun.sun'] = { entity_id: 'sun.sun', state: 'above_horizon', attributes: sun };
+    else delete states['sun.sun'];
+    card.hass = { ...card.hass, states };
+    await card.updateComplete;
+  }, sun);
+  await pushSpace(DAY_SUN);
+  checks.ac6_dayHidesTheMoon = await until(page,
+    () => window.__hpSpaceCard.renderRoot.querySelector('.hp-moon')?.classList.contains('on') === false);
+  // Without `sun.sun`: 17:59 is day by the clock; 18:00 comes without a state update.
+  await page.clock.setSystemTime(new Date('2026-10-21T17:59:00Z'));
+  await pushSpace(null);
+  await page.waitForTimeout(300);
+  const clockDay = await spaceMoon();
+  await page.clock.runFor(90_000);
+  const clockDusk = await until(page, spaceOn);
+  report.ac6.clockDay = clockDay;
+  checks.ac6_clockDuskShowsTheMoon = !clockDay.on && clockDusk;
+  console.log(JSON.stringify(report, null, 1));
+  checkAll(checks);
+  await finish(browser, checks);
+}
diff --git a/demo/smoke_moon_status.mjs b/demo/smoke_moon_status.mjs
new file mode 100644
index 00000000..e72ab085
--- /dev/null
+++ b/demo/smoke_moon_status.mjs
@@ -0,0 +1,200 @@
+// #718 AC11/AC12: the «Now: …» line under the moon switch in General
+// settings, in the production bundle. One snapshot per opening, judged by the
+// lazy moon chunk as if the switch were on; kept outside the draft. Moscow
+// through `hass.config`, the page clock at 2026-10-21 18:00Z (the moon at
+// 23.9°, 79 % lit), the demo in English.
+import { launch, checkAll, finish } from './serve.mjs';
+
+const MOSCOW = { latitude: 55.75, longitude: 37.62 };
+const NIGHT_SUN = { azimuth: 0, elevation: -12, rising: false };
+const HINT = 'Shown behind the plan with any background, from 3° above the horizon, except around new moon; '
+  + 'computed from the home coordinates in Home Assistant.';
+const SHOWN = 'Now: shown (24° above the horizon, 79% lit).';
+const DAY_SUN = 'Now: not shown (the sun is 25° above the horizon; the moon shows once it is below 6°).';
+const checks = {};
+const report = {};
+const isMoonAsset = (url) => /\/moon-runtime-[^/?]*\.js(?:\?|$)/.test(url);
+
+/**
+ * A fresh page (the chunk is loaded once per page). `route` intercepts the
+ * moon chunk on top of the harness's `route('**\/*')`.
+ */
+async function open({ moon = false, route = null } = {}) {
+  const run = await launch({ width: 1000, height: 760 });
+  run.moonRequests = [];
+  run.page.on('request', (request) => { if (isMoonAsset(request.url())) run.moonRequests.push(request.url()); });
+  if (route) await run.page.route('**/moon-runtime-*.js', route);
+  await run.page.clock.setFixedTime(new Date('2026-10-21T18:00:00Z'));
+  await pushHass(run.page, { config: MOSCOW, sun: NIGHT_SUN });
+  await run.page.evaluate((moon) => window.__hpTest.setServerConfig((cfg) => {
+    cfg.settings = { ...(cfg.settings || {}), bg_mode: 'static' };
+    if (moon) cfg.settings.moon = true; else delete cfg.settings.moon;
+    return cfg;
+  }), moon);
+  return run;
+}
+
+const pushHass = (page, { config, sun }) => page.evaluate(async ({ config, sun }) => {
+  const card = window.__card;
+  card.hass = {
+    ...card.hass,
+    ...(config ? { config } : {}),
+    states: sun
+      ? { ...card.hass.states, 'sun.sun': { entity_id: 'sun.sun', state: sun.elevation > 0 ? 'above_horizon' : 'below_horizon', attributes: sun } }
+      : card.hass.states,
+  };
+  await card.updateComplete;
+}, { config, sun });
+
+/** Open General settings; what the first rendered frame shows. */
+const openDialog = (page) => page.evaluate(async () => {
+  const card = window.__card;
+  card._openSettingsDialog();
+  await card.updateComplete;
+  const lines = card.renderRoot.querySelectorAll('hp-dialog [data-moon-status]');
+  return {
+    lines: lines.length,
+    caption: card.renderRoot.querySelector('hp-dialog #gs-moon-caption')?.textContent.trim() ?? null,
+  };
+});
+const line = (page) => page.evaluate(() => {
+  const root = window.__card.renderRoot;
+  const nodes = root.querySelectorAll('hp-dialog [data-moon-status]');
+  const node = nodes[0] || null;
+  return {
+    count: nodes.length,
+    reason: node?.dataset.moonStatus ?? null,
+    text: node?.textContent.trim() ?? null,
+    describedBy: root.querySelector('hp-dialog #gs-moon')?.getAttribute('aria-describedby') ?? null,
+    inCaption: !!node?.closest('#gs-moon-caption'),
+    live: !!node?.closest('[aria-live]'),
+    saveDisabled: !!root.querySelector('hp-dialog [data-hp="dialog-confirm"]')?.disabled,
+  };
+});
+const waitLine = (page, timeout = 2000) => page.waitForFunction(
+  () => !!window.__card.renderRoot.querySelector('hp-dialog [data-moon-status]'), null, { timeout },
+).then(() => true, () => false);
+const closeDialog = (page) => page.evaluate(async () => {
+  const dialog = window.__card.renderRoot.querySelector('hp-dialog[data-kind="settings"]');
+  if (!dialog) return { closed: false, confirm: false };
+  const result = await window.__hpTest.close(dialog);
+  return { closed: result.closed, confirm: !!result.confirm };
+});
+
+// ─── AC11 and AC12 (chunk already loaded by the View at night) ───
+{
+  const { page, browser } = await open({ moon: true });
+  const planMoon = await page.waitForFunction(
+    () => window.__card.renderRoot.querySelector('.hp-moon.on')?.dataset.moonK, null, { timeout: 8000 },
+  ).then((handle) => handle.jsonValue(), () => null);
+  const first = await openDialog(page);
+  // AC12: the View loaded the chunk — the line is in the dialog's first frame.
+  checks.ac12_preloadedLineInTheFirstFrame = first.lines === 1;
+  const shown = await line(page);
+  report.ac11 = { planMoon, first, shown };
+  checks.ac11_shownText = shown.text === SHOWN && shown.reason === 'shown';
+  checks.ac11_percentIsThePlanMoon = planMoon !== null && Math.round(Number(planMoon) * 100) === 79;
+  checks.ac11_lineIsTheSecondCaptionLine = shown.inCaption && shown.describedBy === 'gs-moon-caption'
+    && !shown.live && first.caption === `${HINT}${SHOWN}`;
+  checks.ac11_lineLeavesTheDraftClean = shown.saveDisabled;
+  const toggled = [];
+  for (let i = 0; i < 2; i++) {
+    await page.evaluate(async () => {
+      window.__card.renderRoot.querySelector('hp-dialog #gs-moon')?.click();
+      await window.__card.updateComplete;
+    });
+    toggled.push(await line(page));
+  }
+  report.ac11.toggled = toggled;
+  checks.ac11_switchDoesNotChangeTheText = toggled.every((state) => state.text === SHOWN && state.count === 1);
+  const closed = await closeDialog(page);
+  checks.ac11_closesWithoutAsking = closed.closed && !closed.confirm;
+
+  await pushHass(page, { sun: { azimuth: 200, elevation: 25.4, rising: false } });
+  await openDialog(page);
+  const day = await line(page);
+  checks.ac11_daySunText = day.count === 1 && day.reason === 'day_sun' && day.text === DAY_SUN;
+  await closeDialog(page);
+
+  await pushHass(page, { config: { unit_system: { length: 'km' } } });
+  await openDialog(page);
+  const noHome = await line(page);
+  report.ac11.day = day;
+  report.ac11.noHome = noHome;
+  checks.ac11_noHomeReason = noHome.count === 1 && noHome.reason === 'no_home';
+  await closeDialog(page);
+  await browser.close();
+}
+
+// ─── AC12: the chunk arrives a second late ───
+{
+  const delay = async (route) => { await new Promise((done) => setTimeout(done, 1000)); await route.fallback(); };
+  const { page, browser, moonRequests } = await open({ route: delay });
+  const first = await openDialog(page);
+  checks.ac12_noLineWhileLoading = first.lines === 0 && first.caption === HINT;
+  checks.ac12_lineArrives = await waitLine(page, 2000);
+  const late = await line(page);
+  report.ac12 = { first, late, requests: moonRequests.length };
+  // The switch is off here: the dialog alone asked for the chunk, and the line
+  // still says what the switch would show when on.
+  checks.ac12_dialogLoadsTheChunkWithTheMoonOff = moonRequests.length === 1 && late.reason === 'shown'
+    && late.saveDisabled;
+  await closeDialog(page);
+  await browser.close();
+}
+
+// ─── AC12: opened while loading, closed, sun changed, opened again ───
+{
+  const delay = async (route) => { await new Promise((done) => setTimeout(done, 1000)); await route.fallback(); };
+  const { page, browser } = await open({ route: delay });
+  await openDialog(page);
+  const closed = await closeDialog(page);
+  await pushHass(page, { sun: { azimuth: 180, elevation: 40, rising: false } });
+  await openDialog(page);
+  const arrived = await waitLine(page, 3000);
+  await page.waitForTimeout(300);
+  const again = await line(page);
+  report.ac12.reopened = { closed, again };
+  checks.ac12_reopenShowsOnlyTheSecondSnapshot = closed.closed && arrived && again.count === 1
+    && again.reason === 'day_sun';
+  await closeDialog(page);
+  await browser.close();
+}
+
+// ─── AC12: the chunk request is refused ───
+{
+  const { page, browser } = await open({ route: (route) => route.abort() });
+  const first = await openDialog(page);
+  await page.waitForTimeout(800);
+  const refused = await line(page);
+  report.ac12.refused = { first, refused };
+  checks.ac12_refusedLeavesNoLine = first.lines === 0 && refused.count === 0;
+  // The dialog keeps working: a change enables Save and saves; Cancel closes.
+  const saved = await page.evaluate(async () => {
+    const card = window.__card;
+    const root = card.renderRoot;
+    root.querySelector('hp-dialog #gs-moon')?.click();
+    await card.updateComplete;
+    const save = root.querySelector('hp-dialog [data-hp="dialog-confirm"]');
+    const enabled = !!save && !save.disabled;
+    save?.click();
+    const deadline = Date.now() + 4000;
+    while (root.querySelector('hp-dialog[data-kind="settings"]') && Date.now() < deadline) {
+      await new Promise((done) => setTimeout(done, 50));
+    }
+    return { enabled, closed: !root.querySelector('hp-dialog[data-kind="settings"]'), moon: card._serverCfg.settings.moon === true };
+  });
+  await openDialog(page);
+  const cancelled = await page.evaluate(async () => {
+    const dialog = window.__card.renderRoot.querySelector('hp-dialog[data-kind="settings"]');
+    const result = await window.__hpTest.close(dialog, { via: 'cancel' });
+    return { closed: result.closed, confirm: !!result.confirm };
+  });
+  report.ac12.saved = saved;
+  report.ac12.cancelled = cancelled;
+  checks.ac12_saveStillWorks = saved.enabled && saved.closed && saved.moon;
+  checks.ac12_cancelStillWorks = cancelled.closed && !cancelled.confirm;
+  console.log(JSON.stringify(report, null, 1));
+  checkAll(checks);
+  await finish(browser, checks);
+}
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 5fdf6c43..7ea3840d 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -2,6 +2,17 @@
 
 ## Unreleased
 
+- The moon now appears with any background, not only "Follow the Sun": with a
+  static background — the theme's or a colour of your own, for the whole
+  installation or a single space — it stands in the same top-left corner behind
+  the plan at dawn, dusk and night, in View, kiosk, the panel and the space
+  card, while the background keeps its colour. If "Moon over the plan at dusk
+  and night" was already on, the moon appears on static backgrounds after this
+  update; switch it off in General settings › Sun and Moon to hide it. Under
+  that switch a new line tells whether the moon is shown right now and, if not,
+  why — daytime, the moon below 3°, new moon or no home location in Home
+  Assistant ([#718](https://github.com/Matysh/houseplan-card/issues/718)).
+
 ## v1.79.0-beta.1 — 2026-09-30
 
 - In 2.5D View the plan no longer moves: rooms, furniture, other decor and room
diff --git a/docs/CHANGELOG.ru.md b/docs/CHANGELOG.ru.md
index 072aebc7..d8999e46 100755
--- a/docs/CHANGELOG.ru.md
+++ b/docs/CHANGELOG.ru.md
@@ -8,6 +8,17 @@
 
 ## Не выпущено
 
+- Луна теперь видна при любом фоне, а не только на «Следует за Солнцем»: при
+  статичном фоне — фоне темы или своём цвете, для всей установки или одного
+  пространства — она стоит в том же левом верхнем углу за планом в сумерках и
+  ночью, в просмотре, киоске, панели и карточке пространства, а фон сохраняет
+  свой цвет. Если переключатель «Луна на плане в сумерках и ночью» уже был
+  включён, после обновления луна появится и на статичном фоне; чтобы её убрать,
+  выключите его в общих настройках, раздел «Солнце и Луна». Под переключателем
+  появилась строка: видна ли луна сейчас, а если нет — почему (день, луна ниже
+  3°, новолуние или в Home Assistant не заданы координаты дома)
+  ([#718](https://github.com/Matysh/houseplan-card/issues/718)).
+
 ## v1.79.0-beta.1 — 2026-09-30
 
 - В объёмном 2.5D-виде план больше не сдвигается: комнаты, мебель, прочий декор
diff --git a/docs/CONFIG-COMPATIBILITY.md b/docs/CONFIG-COMPATIBILITY.md
index 10b175c4..a232e9b8 100644
--- a/docs/CONFIG-COMPATIBILITY.md
+++ b/docs/CONFIG-COMPATIBILITY.md
@@ -134,21 +134,26 @@ An older frontend ignores the field and shows Flat. An older backend preserves
 it through the unknown-settings policy. Full backup/import carries `settings`
 whole, so the value survives.
 
-## Moon (#661)
+## Moon (#661, #718)
 
-`settings.moon` is an optional global boolean: the moon on the "Follow the Sun"
-background for every space, user, device and kiosk. Only exact `true` switches
-it on; absence, `false` or anything else read as off. Saving `false` removes
-the key. There is no per-space moon: a space shows it only when its effective
-`bg_mode` is `daynight`. The backend accepts only a boolean
+`settings.moon` is an optional global boolean: the moon behind the plan at
+dawn, dusk and night for every space, user, device and kiosk, with any
+background (#718 — before it, only on "Follow the Sun"). Only exact `true`
+switches it on; absence, `false` or anything else read as off. Saving `false`
+removes the key. There is no per-space moon switch, and the effective
+`bg_mode` of a space is no longer a condition: a space with a static
+background, its own or the global one, shows the moon too. The backend accepts only a boolean
 (`vol.Optional("moon"): bool`), and the privacy-safe support projection copies
 only a validated boolean. New installations get `moon: true` in
 `DEFAULT_CONFIG`; an existing config has no key and keeps its look after the
 update (docs/SUN.md). "Reset to defaults" in General settings sets `true`. The
 store and model versions do not change; there is no migration.
 
-An older frontend ignores the field and shows no moon. An older backend
-preserves it through the unknown-settings policy. Full backup/import carries
+An older frontend ignores the field and shows no moon; a #661 frontend with a
+#718 config shows it only on `daynight`, as before. #718 adds no field and no
+migration: an installation that already has `moon: true` with a static
+background sees the moon there after the update, and the same switch turns it
+off. An older backend preserves it through the unknown-settings policy. Full backup/import carries
 `settings` whole, so the value survives; a one-space export does not carry
 global settings.
 
diff --git a/docs/SUN.md b/docs/SUN.md
index daa47a05..a400d4c0 100644
--- a/docs/SUN.md
+++ b/docs/SUN.md
@@ -376,26 +376,26 @@ The wash lives where the Flat `.sunlayer` lives (floor group, above room fills
 and Glow) as `.sunlayer.iso-sunwash`, one `.iso-sunbeam[data-opening]` per lit
 window. Witness: `demo/smoke_iso_sun.mjs`.
 
-## Moon — `settings.moon` (#661)
+## Moon — `settings.moon` (#661, any background since #718)
 
-At dawn, dusk and night on the "Follow the Sun" background, the moon in its
-current phase stands in the top-left corner of the scene: a thin crescent, a
-half, a full disc. General settings › Sun and Moon › «Moon over the plan at
-dusk and night» switches it for the whole installation.
+At dawn, dusk and night, with any background, the moon in its current phase
+stands in the top-left corner of the scene: a thin crescent, a half, a full
+disc. General settings › Sun and Moon › «Moon over the plan at dusk and night»
+switches it for the whole installation; there is no per-space moon switch.
 
 **When it is shown** — all at once, otherwise there is no moon:
 
 - `settings.moon === true` (global; absent, `false` or anything else is off);
-- the effective `bg_mode` of the space is `daynight` — the moon lives in the
-  four-phase environment, so a space with its own `static` has no moon, and
-  there is no per-space moon switch;
-- the environment phase is `dawn`, `dusk` or `night` (the same
-  `resolveDayCycle`, browser-clock fallback included);
+- the day-cycle phase is `dawn`, `dusk` or `night`: `resolveDayCycle(hass,
+  now)`, whatever the background — with a valid `sun.sun` (`dayCycleSunOf`:
+  finite azimuth and elevation, boolean `rising`) day is elevation ≥ 6°
+  (exactly 6° is day), otherwise the browser-local clock, day 08:00–18:00. The
+  effective `bg_mode` of the space is not a condition (#718 K1);
 - the topocentric altitude is ≥ 3° (`MOON_ELEVATION_MIN = RAY_ELEVATION_MIN`);
 - the illuminated fraction is ≥ 3 % (`MOON_MIN_ILLUMINATION`, about ±1.5 days
   around new moon);
-- a View surface: View, kiosk or `houseplan-space-card` (editors have no
-  environment);
+- a View surface: View, kiosk, panel or `houseplan-space-card` (editors, the
+  PDF export and the space dialog preview have no moon);
 - `hass.config.latitude/longitude` are finite numbers.
 
 **Where the numbers come from.** Home Assistant publishes no moon altitude
@@ -423,12 +423,29 @@ quantised to 0.01 only so the element changes when the fingerprint does. The
 dark side is the same art at 8 % opacity.
 
 **Place, size, layer.** Fixed top-left corner, box `min(200px, 25cqmin)` of the
-scene (the environment is the size container), inset 5 % of the box; it does
-not move with pan or zoom and never takes the pointer. It is the last child of
-`.hp-day-cycle-env`: above the phase gradients and the sun glow, below the plan
-paper, rooms, devices, labels and UI. A plan that fills the scene covers the
-moon partly or entirely — that is the environment's norm, like the sun glow
-(owner decision 7).
+scene, inset 5 % of the box; it does not move with pan or zoom and never takes
+the pointer. Over "Follow the Sun" it is the last child of `.hp-day-cycle-env`:
+above the phase gradients and the sun glow, below the plan paper, rooms,
+devices, labels and UI. A plan that fills the scene covers the moon partly or
+entirely — that is the environment's norm, like the sun glow (owner
+decision 7).
+
+**Static background (#718 K3).** No environment is created — no
+`.hp-day-cycle-env`, no `daycycle`/`phase-*` classes, no
+`.hp-paper-outline-svg`; the scene keeps the chosen colour or the theme's. The
+same `.hp-moon` element stands in its own layer `<div class="hp-moon-sky"
+aria-hidden="true">`, the first child of `.stage` (full card) or
+`.hp-static-stage` (space card) — where the environment would be. The layer is
+the whole scene (`position:absolute; inset:0; overflow:hidden;
+pointer-events:none; container-type:size`), so the box and place are the same;
+it has no `z-index`, `filter` or `will-change` and lies under the plan by DOM
+order (`.zoomwrap` and the space card's plan are `z-index:1`). The layer's
+`opacity` is the View weight of the #101 transition, as the environment's;
+editors have neither. Switching between `daynight` and `static` (a space tab,
+the background segment previewed in the open dialog, a config push) moves the
+element to its new parent in the same render, in its final state, on the same
+box — no flicker. The chunk renders and styles the layer; until it is here
+there is no layer.
 
 **Movement.** Opacity only, 2 s on the background curve (`RAY_FADE_MS`),
 none under `prefers-reduced-motion`: rising through 3°, setting through it,
@@ -439,13 +456,47 @@ the ticker keeps the last rendered inputs, and an equal fingerprint
 (`visible | k`) costs no render. A card that renders without a moon, leaves the
 page or is hidden drops or pauses its ticker.
 
-**Weight.** Astronomy, art (≈ 9 KB gzip) and template are one lazy chunk,
-`moon-runtime-*`, loaded when the moon is switched on, the environment exists
-and it is not daytime; until it arrives there is no moon, a failed load is
-retried at most every 30 s through the exact-build loader of the isometric
-runtime. The initial View graph carries only the gate (`src/moon-gate.ts`).
-One element, no CSS filter and no `will-change`: the composited layer count
-does not change (`demo/smoke_daycycle_layer_budget.mjs`).
+With a static background the phase for the moon comes from the same
+`resolveDayCycle` (`moonSkyState` in `src/moon-gate.ts`), computed only while
+the moon is on and the surface is View. With `sun.sun` it follows the Home
+Assistant state updates the cards already re-render on. Without it the card
+keeps its 30 s clock ticker (`_syncDayCycleClock`, both cards) and re-renders
+only when the phase changes (`dayCycleClock`: the environment is compared by
+its whole fingerprint, the moon's sky by its phase), so the moon leaves at
+08:00 and comes at 18:00 without a state update. The moon switched off or an
+editor: no phase, no ticker.
+
+**Weight.** Astronomy, art (≈ 9 KB gzip), template, the static-background
+layer and the status function are one lazy chunk, `moon-runtime-*`, loaded
+when the moon is switched on on a View surface and it is not daytime — with any
+background — and when General settings open (for the status line, by day and
+with the moon off too). One load per page through the gate's loader
+(`withMoon`): a chunk of another build is never installed, a failed load is
+retried at most every 30 s, and every caller meanwhile waits for the same load.
+The initial View graph carries only the gate (`src/moon-gate.ts`); the editor
+graph only the status line and its strings (`src/editors/moon-status.ts`) —
+`src/moon.ts` is in neither (`scripts/bundle-budget.mjs` refuses an overlap of
+the moon graph with the initial or the editor graph). One element, no CSS
+filter and no `will-change`: the composited layer count does not change, with
+either background (`demo/smoke_daycycle_layer_budget.mjs`).
+
+**Status line (#718 K7).** Under the switch in General settings a second
+caption line, inside `aria-describedby`, no `aria-live`, anchored
+`data-moon-status="shown|no_home|day_sun|day_clock|low|new"`: «Now: shown (24°
+above the horizon, 79% lit).» or «Now: not shown (reason).», the first reason
+that holds — no home coordinates; day (by `sun.sun` with its elevation, or by
+the clock); the moon below 3°; under 3 % lit. It is judged once per opening on
+a snapshot taken when the dialog opens (`now`, `hass.config`, `sun.sun`), as
+if the switch were on — the moon no longer depends on the background, so one
+status serves the installation; the switch, «Reset» and the background segment
+do not change it. `moonStatus` in `src/moon.ts` decides «shown» with the same
+`moonShownAt` as the element (AC10 checks the equivalence every hour of a
+month), rounds to whole numbers and keeps a hidden reason's number below its
+threshold (2.6° reads «2°»). The status lives beside the draft, never in it:
+the line arriving leaves «Save» disabled. While the chunk loads, or when it
+failed, there is no line; a closed opening's result is dropped. The line
+belongs to the browser the dialog is open in — a wall tablet with another
+clock or time zone may differ.
 
 **Limits (documented, not bugs).**
 
@@ -455,6 +506,8 @@ does not change (`demo/smoke_daycycle_layer_budget.mjs`).
   not follow the hemisphere (owner decision): the crescent is "vertical".
 - Earthshine is not modelled; the dark side is an 8 % silhouette for legibility.
 - The moon does not follow its azimuth — fixed corner of the scene.
+- One art for every background (owner decision, #718): on a mid-grey custom
+  colour the disc has less contrast than on white or at night.
 - A dense layout (plan filling the screen) shows only the part of the disc in
   the margins.
 - Coordinates come from Home Assistant: an installation that kept the default
@@ -504,11 +557,14 @@ saving General settings removes it.
 - `src/day-cycle-render.ts` — the shared constant environment layers and
   plan-outline variables for full and static cards.
 - `src/moon.ts`, `src/moon-runtime.ts`, `src/moon-gate.ts`,
-  `src/moon-art.generated.ts` — the moon (#661): pure astronomy and mask, the
-  lazy chunk with the element and its ticker, the initial-graph gate, the
-  generated art (`node scripts/generate-moon-assets.mjs` from
-  `assets/moon/houseplan-1.0.0`); unit-tested in `test/moon.test.mjs`,
-  end-to-end in `demo/smoke_moon.mjs`.
+  `src/moon-art.generated.ts` — the moon (#661, #718): pure astronomy, mask and
+  status, the lazy chunk with the element, the static-background layer and the
+  ticker, the initial-graph gate with the page-wide loader, the generated art
+  (`node scripts/generate-moon-assets.mjs` from `assets/moon/houseplan-1.0.0`);
+  `src/editors/moon-status.ts` — the General settings line. Unit-tested in
+  `test/moon.test.mjs` and `test/moon-settings.test.mjs`, end-to-end in
+  `demo/smoke_moon.mjs`, `demo/smoke_moon_static.mjs` and
+  `demo/smoke_moon_status.mjs`.
 - `src/houseplan-card.ts` — the memoised wedge layer, four-phase background
   lifecycle, and both settings dialogs (compass dial included).
 - `src/space-render.ts` / `src/space-card.ts` — static-card environment and
diff --git a/docs/USER-GUIDE.md b/docs/USER-GUIDE.md
index 6ce1672d..bc45f0d2 100644
--- a/docs/USER-GUIDE.md
+++ b/docs/USER-GUIDE.md
@@ -1657,19 +1657,27 @@ choice. Shadows from trees, awnings or other building wings are not modelled.
 
 ### Moon
 
-On the **Follow the sun** background, at dawn, dusk and night, the moon in its
-current phase stands in the top-left corner of the scene — a thin crescent, a
-half, a full disc. One switch in General settings turns it on: **Sun and Moon**
-→ **Moon over the plan at dusk and night**. It is on for new installations and
-off for upgraded ones until switched on: an update never changes how a plan
-looks.
+With any background — **Follow the sun**, the theme background or a colour of
+your own — at dawn, dusk and night the moon in its current phase stands in the
+top-left corner of the scene — a thin crescent, a half, a full disc. One switch
+in General settings turns it on: **Sun and Moon** → **Moon over the plan at dusk
+and night**. It is on for new installations and off for upgraded ones until
+switched on: an update never changes how a plan looks. If the switch was
+already on with a static background, the moon appears on that background after
+the update; the same switch removes it.
+
+Dusk and night are decided as for the Follow the sun background: with a valid
+`sun.sun` by the sun's elevation (below 6°), without it by the browser clock
+(day is 08:00–18:00). A static background stays as it is: the chosen colour
+around the plan, no gradients and no outline glow — only the moon is added.
 
 | Condition | Result |
 |---|---|
 | Daytime, moon below 3° above the horizon, or new moon (under 3 % lit) | No moon |
 | The moon rises above 3° or sets below it | Fades in/out over 2 seconds; immediately with reduced motion |
 | Phase | Changes continuously, every day; the lit side is always on the left, waning runs the same states backwards |
-| Space with its own static background | No moon — it belongs to the Follow the sun background |
+| Space with its own static background | The same moon: same place, size and phase; the background keeps its colour |
+| Changing the background, or a tab with another background | The moon does not flicker and stays in place |
 | The plan covers the corner of the scene | The moon is behind the plan: the part of the disc in the margins shows; the plan, devices and labels are always on top |
 | Editors | No moon |
 | Full card, kiosk, static space card | The same |
@@ -1680,7 +1688,28 @@ integration or external data. A Home Assistant that kept the default location
 shows someone else's moon — as with `sun.sun`; a wrong tablet clock gives a
 wrong phase and moment. Position accuracy is about 1°, so crossing 3° may
 differ from ephemerides by a few minutes. The terminator tilt and earthshine
-are not modelled; the dark side is a faint silhouette so a crescent reads.
+are not modelled; the dark side is a faint silhouette so a crescent reads. One
+image serves every background: on a mid-grey colour of your own the moon has
+less contrast.
+
+Under the switch a «Now: …» line says whether the moon is shown this minute
+and, if not, why — the first reason that holds:
+
+| Line | When |
+|---|---|
+| Now: shown (24° above the horizon, 79% lit). | The moon is shown; altitude and illumination in whole numbers |
+| Now: not shown (the home location is not set in Home Assistant). | No home latitude and longitude — even by day |
+| Now: not shown (the sun is 25° above the horizon; the moon shows once it is below 6°). | Daytime by `sun.sun` |
+| Now: not shown (daytime by the clock, 08:00–18:00: Home Assistant has no sun.sun data). | Daytime by the browser clock |
+| Now: not shown (the moon is at 2°; it shows from 3° above the horizon). | The moon is below 3° |
+| Now: not shown (new moon, 2% lit; it shows from 3%). | Under 3 % lit |
+
+The line is computed once when the dialog opens and tells what the switch would
+show when on: the switch itself, the background chosen in the dialog and the
+space settings do not change it. It belongs to the browser the dialog is open
+in: a wall tablet with another clock or time zone may show or hide its moon at
+another moment. While the moon's data loads, or if loading failed, there is no
+line — the general hint stays.
 
 ## 16. Robot vacuums
 
diff --git a/docs/USER-GUIDE.ru.md b/docs/USER-GUIDE.ru.md
index baa0a1b8..5a1a3bb5 100644
--- a/docs/USER-GUIDE.ru.md
+++ b/docs/USER-GUIDE.ru.md
@@ -1797,7 +1797,7 @@ WebP и безопасный SVG; лимит 2 МиБ относится к со
 
 ## 15. Солнце и Луна: фон, оконные лучи и луна
 
-Фон и оконные лучи — две независимые функции; луна живёт на фоне. Фон **Следует за Солнцем** работает без компаса:
+Фон, оконные лучи и луна — независимые функции; луна стоит за планом при любом фоне. Фон **Следует за Солнцем** работает без компаса:
 он использует корректные данные `sun.sun`, а при их отсутствии автоматически
 переходит на локальные часы браузера. Направление севера и `sun.sun` обязательны
 только для оконных лучей. Общие значения можно переопределить в конкретном
@@ -1857,19 +1857,28 @@ WebP и безопасный SVG; лимит 2 МиБ относится к со
 
 ### Луна
 
-При фоне **Следует за Солнцем** в сумерках (утренних и вечерних) и ночью в левом
-верхнем углу сцены видна луна в текущей фазе — тонкий серп, половина, полная.
-Включается одним переключателем в общих настройках, раздел **Солнце и Луна** →
-**Луна на плане в сумерках и ночью**. У новых установок переключатель включён,
-у обновлённых старых — выключен, пока его не включат: обновление не меняет вид
-плана.
+При любом фоне — **Следует за Солнцем**, фоне темы или своём цвете — в сумерках
+(утренних и вечерних) и ночью в левом верхнем углу сцены видна луна в текущей
+фазе — тонкий серп, половина, полная. Включается одним переключателем в общих
+настройках, раздел **Солнце и Луна** → **Луна на плане в сумерках и ночью**. У
+новых установок переключатель включён, у обновлённых старых — выключен, пока его
+не включат: обновление не меняет вид плана. Если переключатель уже был включён,
+а фон статичный, после обновления луна появится и на нём; убрать её — тем же
+переключателем.
+
+Сумерки и ночь определяются так же, как у фона «Следует за Солнцем»: при
+корректном `sun.sun` — по высоте Солнца (ниже 6°), без него — по часам
+браузера (день 08:00–18:00). Статичный фон при этом не меняется: вокруг плана
+остаётся выбранный цвет, градиентов и свечения контура нет, добавляется только
+луна.
 
 | Условие | Результат |
 |---|---|
 | День, луна ниже 3° над горизонтом или новолуние (освещено меньше 3 %) | Луны нет |
 | Луна поднимается выше 3° или уходит ниже | Плавно появляется/исчезает за 2 секунды; при системном уменьшении движения — сразу |
 | Фаза | Меняется непрерывно, каждый день; освещённая сторона всегда слева, убывание идёт теми же состояниями в обратном порядке |
-| Пространство с собственным статическим фоном | Луны нет — она часть фона «Следует за Солнцем» |
+| Пространство с собственным статическим фоном | Луна та же: то же место, размер и фаза, фон — выбранный цвет |
+| Смена фона или переход на вкладку с другим фоном | Луна не мигает и остаётся на месте |
 | План закрывает угол сцены | Луна за планом: видна та часть диска, что в полях; план, устройства и подписи всегда поверх неё |
 | Редакторы | Луны нет |
 | Полная карточка, киоск, статическая карточка пространства | Одинаково |
@@ -1881,6 +1890,27 @@ WebP и безопасный SVG; лимит 2 МиБ относится к со
 появления. Точность положения около 1°: момент пересечения 3° может разойтись с
 эфемеридами на несколько минут. Наклон терминатора и пепельный свет не
 воспроизводятся, тёмная сторона — едва заметный силуэт для читаемости серпа.
+Картинка одна для всех фонов: на среднем сером своём цвете луна контрастнее не
+станет.
+
+Под переключателем — строка «Сейчас: …»: видна ли луна в эту минуту, а если нет,
+то почему — первая по порядку причина:
+
+| Строка | Когда |
+|---|---|
+| Сейчас: показывается (на 24° над горизонтом, освещено 79 %). | Луна видна; высота и освещённость округлены до целых |
+| Сейчас: не показывается (в Home Assistant не заданы координаты дома). | Нет широты и долготы дома — даже днём |
+| Сейчас: не показывается (Солнце на 25° над горизонтом, луна видна, когда оно ниже 6°). | День по `sun.sun` |
+| Сейчас: не показывается (день по часам, 08:00–18:00: в Home Assistant нет данных sun.sun). | День по часам браузера |
+| Сейчас: не показывается (луна на высоте 2°, видна от 3° над горизонтом). | Луна ниже 3° |
+| Сейчас: не показывается (новолуние, освещено 2 %, видна от 3 %). | Освещено меньше 3 % |
+
+Строка считается один раз при открытии диалога и говорит, что было бы при
+включённом переключателе: положение тумблера, выбор фона в диалоге и
+настройки пространств на неё не влияют. Она относится к браузеру, в котором
+открыт диалог: если у настенного планшета другие часы или часовой пояс, его
+луна может появиться или исчезнуть в другой момент. Пока данные луны
+загружаются или если загрузка не удалась, строки нет — остаётся общее пояснение.
 
 ## 16. Роботы-пылесосы
 
diff --git a/docs/testing-notes/mutation-browser-guards.md b/docs/testing-notes/mutation-browser-guards.md
index b99aeef4..0ad82b44 100644
--- a/docs/testing-notes/mutation-browser-guards.md
+++ b/docs/testing-notes/mutation-browser-guards.md
@@ -16,8 +16,8 @@ to prove that the Node witness actually kills it.
 | Paint, cascade and layer composition | 26 | The invariant depends on computed CSS, SVG paint, clipping, stacking or pixels produced by Chromium. |
 | Pointer geometry and trusted interaction | 45 | The invariant depends on hit testing, pointer capture, touch/keyboard dispatch or live DOM geometry. |
 | Responsive DOM layout | 36 | The invariant depends on measured element boxes, responsive breakpoints, native/HA dialog shells or focusable target size. |
-| Custom-element and HA browser lifecycle | 85 | The invariant crosses Lit/custom-element lifecycle, browser storage/events, lazy loading or a complete HA-card state transition. |
-| **Total** | **200 / 200** | Growth above the cap fails `mutation-gate --check`. |
+| Custom-element and HA browser lifecycle | 86 | The invariant crosses Lit/custom-element lifecycle, browser storage/events, lazy loading or a complete HA-card state transition. |
+| **Total** | **201 / 200** | Growth above the cap fails `mutation-gate --check`. |
 
 ## Measured effect
 
@@ -242,6 +242,7 @@ The invariant crosses Lit/custom-element lifecycle, browser storage/events, lazy
 - `locale-failure-toast-dropped`
 - `marker-reject-keeps-optimistic-candidate`
 - `marker-rollback-keeps-enqueue-time-revision`
+- `moon-static-clock-tick-off`
 - `namespace-loader-returns-english`
 - `near-axis-authoring-snap-bypassed`
 - `onboarding-loader-skips-namespace-ensure`
diff --git a/scripts/bundle-budget.mjs b/scripts/bundle-budget.mjs
index 87f7e64f..15740c72 100644
--- a/scripts/bundle-budget.mjs
+++ b/scripts/bundle-budget.mjs
@@ -741,6 +741,11 @@ export function assertBundleBudget(
   if (manifest.initialViewFiles.some((path) => manifest.lazyMoonFiles.includes(path))) {
     throw new Error('initial View graph overlaps lazy moon graph');
   }
+  // #718 K9: General settings reach the moon's status through the gate's
+  // loader only; a static import would pull its astronomy into the editor.
+  if (manifest.lazyEditorFiles.some((path) => manifest.lazyMoonFiles.includes(path))) {
+    throw new Error('lazy editor graph overlaps lazy moon graph');
+  }
   // #474: designer furniture artwork is lazy; a static import anywhere in the
   // View graph would pull ~10 KB gzip back into the initial graph silently.
   if (!manifest.lazyFurnitureArtFiles?.length) {
diff --git a/scripts/mutation-registry.mjs b/scripts/mutation-registry.mjs
index e5c8d273..efbd3792 100644
--- a/scripts/mutation-registry.mjs
+++ b/scripts/mutation-registry.mjs
@@ -6302,8 +6302,8 @@ const MUTANT_DEFINITIONS = [
     because: '#661 C7: the moon chunk is not loaded by day — the initial View graph pays only the gate',
     patches: [{
       file: 'src/moon-gate.ts',
-      find: "  if (!runtime && state.phase !== 'day' && Date.now() >= nextAttempt) {",
-      replace: '  if (!runtime && Date.now() >= nextAttempt) {',
+      find: "  if (!runtime && state.phase !== 'day') withMoon(() => host.requestUpdate());",
+      replace: '  if (!runtime) withMoon(() => host.requestUpdate());',
     }],
   },
   {
@@ -6322,6 +6322,58 @@ const MUTANT_DEFINITIONS = [
       replace: "  + '.hp-moon{--hp-moon-box:min(200px,25cqmin);position:absolute;z-index:2;'",
     }],
   },
+  {
+    id: 'moon-static-sky-off',
+    guard: 'npx tsc -p tsconfig.test.json && node scripts/fix-test-build.mjs '
+      + '&& node --test --test-name-pattern="#718" test/moon.test.mjs',
+    because: '#718 AC15/AC1: a static background — global or the space\'s own — shows the moon in its '
+      + 'own sky layer; back to «no environment, no moon» it would give nothing again',
+    patches: [{
+      file: 'src/moon-gate.ts',
+      find: '  return !daynight && viewWeight > 0 && moonOn(settings) ? resolveDayCycle(hass, now) : null;',
+      replace: '  return daynight && viewWeight > 0 && moonOn(settings) ? resolveDayCycle(hass, now) : null;',
+    }],
+  },
+  {
+    id: 'moon-static-clock-tick-off',
+    guard: 'node demo/smoke_moon_static.mjs',
+    because: '#718 AC3/K5: without sun.sun a static background has only the card\'s 30 s clock ticker '
+      + 'to reach 18:00 and 08:00; not armed, the moon never rises by the clock in the real card '
+      + '(page clock, UTC context, no state update), which only the browser run observes',
+    patches: [{
+      file: 'src/houseplan-card.ts',
+      find: '    const [state, key] = dayCycleClock(this._dayCycleState(), this._moonSkyState());\n'
+        + '    this._dayCycleClockKey = key;\n    const needsTimer',
+      replace: '    const [state, key] = dayCycleClock(this._dayCycleState(), null);\n'
+        + '    this._dayCycleClockKey = key;\n    const needsTimer',
+    }],
+  },
+  {
+    id: 'moon-status-order',
+    guard: 'npx tsc -p tsconfig.test.json && node scripts/fix-test-build.mjs '
+      + '&& node --test --test-name-pattern="#718" test/moon.test.mjs',
+    because: '#718 AC9/K7: without home coordinates the status says so even by day — the day reason '
+      + 'checked first would name the sun of a home the card cannot place',
+    patches: [{
+      file: 'src/moon.ts',
+      find: "  if (!sky.home) return { reason: 'no_home' };\n"
+        + "  if (sky.phase === 'day') return sky.source === 'sun' ? { reason: 'day_sun', sun: Math.round(sky.sun ?? 0) } : { reason: 'day_clock' };\n",
+      replace: "  if (sky.phase === 'day') return sky.source === 'sun' ? { reason: 'day_sun', sun: Math.round(sky.sun ?? 0) } : { reason: 'day_clock' };\n"
+        + "  if (!sky.home) return { reason: 'no_home' };\n",
+    }],
+  },
+  {
+    id: 'moon-status-clamp-off',
+    guard: 'npx tsc -p tsconfig.test.json && node scripts/fix-test-build.mjs '
+      + '&& node --test --test-name-pattern="#718" test/moon.test.mjs',
+    because: '#718 AC9/K7: a hidden reason never rounds up to its threshold — 2.6° or 2.6 % read «2», '
+      + 'not «at 3°, shows from 3°»',
+    patches: [{
+      file: 'src/moon.ts',
+      find: "  return sky.altitude < MOON_ELEVATION_MIN ? { reason: 'low', alt: Math.min(alt, 2) } : { reason: 'new', pct: Math.min(pct, 2) };",
+      replace: "  return sky.altitude < MOON_ELEVATION_MIN ? { reason: 'low', alt } : { reason: 'new', pct };",
+    }],
+  },
   {
     id: 'moon-validation-accepts-anything',
     guard: 'python3 -m pytest tests_backend/test_settings_moon.py -q -p no:cacheprovider',
diff --git a/scripts/smoke-links.mjs b/scripts/smoke-links.mjs
index 7d75dbfc..92ec8a09 100644
--- a/scripts/smoke-links.mjs
+++ b/scripts/smoke-links.mjs
@@ -42,11 +42,16 @@ export const SMOKE_LINKS = [
     symbols: [
       'moonLayer', 'renderMoon', 'moonTick', 'moonView', 'moonShownAt', 'moonPhasePath',
       'moonPosition', 'moonIllumination', 'moonFingerprint', 'renderDayCycleEnvironment',
+      'withMoon', 'moonSkyState', 'dayCycleClock', 'renderMoonSky', '_moonSkyState', '_dayCycleClock',
+      'moonStatus', 'moonStatusOf', 'openMoonStatus', 'moonStatusText',
     ],
-    smokes: ['smoke_moon.mjs', 'smoke_daycycle_layer_budget.mjs'],
+    smokes: ['smoke_moon.mjs', 'smoke_moon_static.mjs', 'smoke_moon_status.mjs', 'smoke_daycycle_layer_budget.mjs'],
     because: '#661: the moon is observed only as `.hp-moon` in the production bundle — the lazy '
       + 'chunk arriving at night, the 30 s ticker and state updates carrying it through 3° with the '
       + '2 s fade, the plan painting over it pixel for pixel, and no extra composited layer (CDP); '
+      + '#718: the same over a static background as `.hp-moon-sky` (the clock ticker at 08:00 and '
+      + '18:00, tab and background switches, the #101 View weight, houseplan-space-card) and the '
+      + 'General settings line as `[data-moon-status]` (delayed, refused and preloaded chunk); '
       + 'no smoke names the functions',
   },
   {
diff --git a/src/editors/general-settings-dialog.ts b/src/editors/general-settings-dialog.ts
index 09fc0218..9887e462 100644
--- a/src/editors/general-settings-dialog.ts
+++ b/src/editors/general-settings-dialog.ts
@@ -15,6 +15,7 @@ import {
   formCard, segmented, subsection, textLink, toggleRow, unitInput,
 } from './form-kit';
 import { forgetGeneralBaseline, generalDirty, generalProblems, type GeneralSettingsDraft } from './general-form-state';
+import { moonStatusOf, moonStatusText } from './moon-status';
 import { langOf, type I18nKey } from '../i18n';
 import { settingsT, type SettingsI18nKey } from '../i18n/settings';
 import { supportT } from '../i18n/support';
@@ -76,6 +77,8 @@ export function renderGeneralSettingsDialog(this: HouseplanEditorRuntime): Templ
   };
   const glowProblem = problemFor('gs-glow-radius');
   const northProblem = problemFor('gs-north');
+  // #718 K7: the second caption line, once the moon chunk judged this opening.
+  const moonStatus = moonStatusOf(host);
   const zigbeeHelp = hasTopologyTranslation(lang, 'help') && hasTopologyTranslation(lang, 'help_aria')
     ? html`<hp-help data-help-key="topology.help" .text=${topologyT(lang, 'help')} .ariaLabel=${topologyT(lang, 'help_aria')}></hp-help>`
     : nothing;
@@ -227,7 +230,10 @@ export function renderGeneralSettingsDialog(this: HouseplanEditorRuntime): Templ
           ${renderSunRayOriginSegment(d.sunRayOrigin, (key) => t(key), (sunRayOrigin) => set({ sunRayOrigin }))}
           ${toggleRow({
             id: 'gs-moon', icon: 'mdi:moon-waning-crescent',
-            title: st('gs.moon'), caption: st('gs.moon_hint'),
+            title: st('gs.moon'),
+            caption: moonStatus
+              ? html`${st('gs.moon_hint')}<span style="display:block" data-moon-status=${moonStatus.reason}>${moonStatusText(moonStatus, st)}</span>`
+              : st('gs.moon_hint'),
             checked: d.moon, onChange: (v) => set({ moon: v }),
           })}`,
       })}
diff --git a/src/editors/moon-status.ts b/src/editors/moon-status.ts
new file mode 100644
index 00000000..0f3a9f8c
--- /dev/null
+++ b/src/editors/moon-status.ts
@@ -0,0 +1,68 @@
+/**
+ * #718 K7: the «Now: …» line under the moon switch in General settings.
+ *
+ * One snapshot per opening — `now`, `hass.config`, `sun.sun` — judged by the
+ * lazy moon chunk as if the switch were on: the moon no longer depends on the
+ * background, so one status serves the whole installation, whatever the
+ * switch, the background segment or the spaces say. It lives beside the
+ * draft, never in it (`generalDraftKey` does not see it), so the line arriving
+ * does not make the dialog dirty. The result of an opening that was closed in
+ * the meantime is dropped; until the chunk is here, or when it failed, there
+ * is no line and the hint alone stays.
+ */
+import { withMoon } from '../moon-gate';
+import { resolveDayCycle, sunStateOf } from '../sun';
+import type { MoonStatus, MoonStatusReason } from '../moon';
+import type { SettingsI18nKey } from '../i18n/settings';
+
+interface MoonStatusHost {
+  hass?: unknown;
+  _settingsDialog: unknown;
+  requestUpdate(): void;
+}
+
+interface Opening { status?: MoonStatus }
+
+const openings = new WeakMap<object, Opening>();
+
+/** Called by `_openSettingsDialog` once the draft exists: asks for this opening's status. */
+export function openMoonStatus(host: MoonStatusHost, now: Date = new Date()): void {
+  const opening: Opening = {};
+  openings.set(host, opening);
+  const hass = host.hass as { config?: unknown } | undefined;
+  const state = resolveDayCycle(hass, now);
+  // With `source === 'sun'` this is the very elevation `dayCycleSunOf` read.
+  const sun = sunStateOf(hass)?.elevation ?? null;
+  withMoon((moon) => {
+    if (openings.get(host) !== opening || !host._settingsDialog) return;
+    opening.status = moon.moonStatus(hass?.config, state, sun, now);
+    host.requestUpdate();
+  });
+}
+
+/** The status of the current opening, once the chunk has judged it. */
+export function moonStatusOf(host: object): MoonStatus | undefined {
+  return openings.get(host)?.status;
+}
+
+/** Literal keys (#502): the dead-key gate does not read a key glued from the reason. */
+const MOON_STATUS_KEYS: Readonly<Record<MoonStatusReason, SettingsI18nKey>> = {
+  shown: 'gs.moon_status_shown',
+  no_home: 'gs.moon_status_no_home',
+  day_sun: 'gs.moon_status_day_sun',
+  day_clock: 'gs.moon_status_day_clock',
+  low: 'gs.moon_status_low',
+  new: 'gs.moon_status_new',
+};
+
+/** A signed whole number: the minus is U+2212, no plus; −0 reads as 0. */
+const signed = (value = 0): string => (value < 0 ? `−${-value}` : String(Math.abs(value)));
+
+/** The line's text; `st` is the dialog's `settingsT` for its language. */
+export function moonStatusText(
+  status: MoonStatus, st: (key: SettingsI18nKey, vars: Record<string, string>) => string,
+): string {
+  return st(MOON_STATUS_KEYS[status.reason], {
+    alt: signed(status.alt), pct: signed(status.pct), sun: signed(status.sun),
+  });
+}
diff --git a/src/houseplan-card.ts b/src/houseplan-card.ts
index a54d60df..b1421819 100755
--- a/src/houseplan-card.ts
+++ b/src/houseplan-card.ts
@@ -44,11 +44,11 @@ import { type ResizeAreaPlacement } from './resize-labels';
 import {
   computeSunRays, dayPhase, northDegOf, bgModeOf, sunRaysOn, sunRayOriginOf,
   sunStateOf, rayPeakAlpha, raysVisible, rayColor, RAY_FADE_MS, type SunRay,
-  rayStops, resolveDayCycle, dayCycleFingerprint, type DayCycleState,
+  rayStops, resolveDayCycle, type DayCycleState,
   rayRimEdges, rimStops, rimPeakAlpha, RIM_COLOR, type SunRayOrigin,
 } from './sun';
 import { dayCycleStageVars, renderDayCycleEnvironment } from './day-cycle-render';
-import { moonLayer } from './moon-gate';
+import { dayCycleClock, moonLayer, moonSkyState } from './moon-gate';
 import { renderPaperShapes, type PaperShape } from './render/paper-scene';
 import {
   furnitureGraphic, furnitureArtIsLazy,
@@ -9796,15 +9796,20 @@ export class HouseplanCard extends LitElement {
     return resolveDayCycle(this._renderPlanHass, now);
   }
 
+  /** #718 K1/K5: the moon's phase without an environment (static background, moon on, View). */
+  private _moonSkyState(): DayCycleState | null {
+    return moonSkyState(this._sunGlobal(), this._effBgMode() === 'daynight',
+      this._modeTransitionVisual?.viewWeight ?? (this._mode === 'view' ? 1 : 0), this._renderPlanHass);
+  }
+
   private _dayCycleTick = (): void => {
     if (!this.isConnected || this.ownerDocument.visibilityState === 'hidden') return;
-    const state = this._dayCycleState();
+    const [state, key] = dayCycleClock(this._dayCycleState(), this._moonSkyState());
     if (!state) {
       if (this._dayCycleTimer) { clearInterval(this._dayCycleTimer); this._dayCycleTimer = 0; }
       this._dayCycleClockKey = '';
       return;
     }
-    const key = dayCycleFingerprint(state);
     if (key === this._dayCycleClockKey) return;
     this._dayCycleClockKey = key;
     this.requestUpdate();
@@ -9812,8 +9817,8 @@ export class HouseplanCard extends LitElement {
 
   /** Arm a 30 s timer only for the browser-clock fallback while visible. */
   private _syncDayCycleClock(): void {
-    const state = this._dayCycleState();
-    this._dayCycleClockKey = state ? dayCycleFingerprint(state) : '';
+    const [state, key] = dayCycleClock(this._dayCycleState(), this._moonSkyState());
+    this._dayCycleClockKey = key;
     const needsTimer = state?.source === 'clock'
       && this.ownerDocument.visibilityState !== 'hidden' && this.isConnected;
     if (needsTimer && !this._dayCycleTimer) {
@@ -10868,6 +10873,7 @@ export class HouseplanCard extends LitElement {
           @pointerup=${(e: PointerEvent) => this._stagePointerUp(e)}
           @pointercancel=${(e: PointerEvent) => this._stagePointerCancel(e)}>
           ${renderDayCycleEnvironment(dayCycle, dayCycleWeight, moonLayer(this, this._sunGlobal(), dayCycle))}
+          ${moonLayer(this, this._sunGlobal(), this._moonSkyState(), dayCycleWeight)}
           ${this._editorRuntime ? this._renderEditorSecondary() : nothing}
           <div class="zoomwrap ${this._slide ? 'slide-' + this._slide : ''}"
             ?inert=${this._continuity.overlayBlocksInteraction || this._modeTransitionBusy}
diff --git a/src/houseplan-editor-runtime.ts b/src/houseplan-editor-runtime.ts
index 3321154a..426e7bdd 100644
--- a/src/houseplan-editor-runtime.ts
+++ b/src/houseplan-editor-runtime.ts
@@ -111,6 +111,7 @@ import {
 } from './space-dialog';
 import { rememberSpaceDialogBaseline, spaceDialogProblems } from './editors/space-form-state';
 import { generalProblems, moonDraftOf, rememberGeneralBaseline, writeMoonSetting } from './editors/general-form-state';
+import { openMoonStatus } from './editors/moon-status';
 import { rememberRoomBaseline } from './editors/room-form-state';
 import { forgetMarkerBaseline, rememberMarkerBaseline } from './editors/marker-form-state';
 import { commitPlanOptimization } from './plan-optimize-write';
@@ -8464,6 +8465,7 @@ public _openSettingsDialog = (): void => {
     };
     // #600 К10: снимок на момент открытия — от него считается «есть изменения».
     rememberGeneralBaseline(this.host, this.host._settingsDialog);
+    openMoonStatus(this.host); // #718 K7: the status line, outside the draft
   };
 
 public _openSupportDialog = (): void => {
diff --git a/src/i18n/settings/de.json b/src/i18n/settings/de.json
index 1fd7e149..02e73c55 100644
--- a/src/i18n/settings/de.json
+++ b/src/i18n/settings/de.json
@@ -56,7 +56,13 @@
   "gs.bg_theme_hint": "Hintergrund des Themes wird verwendet.",
   "gs.sun_rays_hint": "Sonnenstrahlen durch Fensteröffnungen zeichnen.",
   "gs.moon": "Mond über dem Plan in Dämmerung und Nacht",
-  "gs.moon_hint": "Erscheint im Hintergrund hinter dem Plan ab 3° über dem Horizont, außer um Neumond; berechnet aus den Koordinaten des Zuhauses in Home Assistant.",
+  "gs.moon_hint": "Erscheint hinter dem Plan bei jedem Hintergrund, ab 3° über dem Horizont, außer um Neumond; berechnet aus den Koordinaten des Zuhauses in Home Assistant.",
+  "gs.moon_status_shown": "Jetzt: sichtbar ({alt}° über dem Horizont, {pct} % beleuchtet).",
+  "gs.moon_status_no_home": "Jetzt: nicht sichtbar (in Home Assistant ist der Standort des Zuhauses nicht festgelegt).",
+  "gs.moon_status_day_sun": "Jetzt: nicht sichtbar (die Sonne steht {sun}° über dem Horizont; der Mond erscheint, sobald sie unter 6° steht).",
+  "gs.moon_status_day_clock": "Jetzt: nicht sichtbar (Tag laut Uhr, 08:00–18:00: Home Assistant liefert keine sun.sun-Daten).",
+  "gs.moon_status_low": "Jetzt: nicht sichtbar (der Mond steht in {alt}° Höhe; er erscheint ab 3° über dem Horizont).",
+  "gs.moon_status_new": "Jetzt: nicht sichtbar (Neumond, {pct} % beleuchtet; sichtbar ab 3 %).",
   "gs.error_glow_radius": "Geben Sie einen Radius größer als null ein.",
   "gs.error_north": "Geben Sie eine ganze Zahl zwischen 0° und 359° ein.",
   "gs.opacity_of": "Deckkraft: {name}",
diff --git a/src/i18n/settings/en.json b/src/i18n/settings/en.json
index 4d390ec2..9ef81de5 100644
--- a/src/i18n/settings/en.json
+++ b/src/i18n/settings/en.json
@@ -56,7 +56,13 @@
   "gs.bg_theme_hint": "Using the theme background.",
   "gs.sun_rays_hint": "Draw sun rays through window openings.",
   "gs.moon": "Moon over the plan at dusk and night",
-  "gs.moon_hint": "Shown on the background behind the plan from 3° above the horizon, except around new moon; computed from the home coordinates in Home Assistant.",
+  "gs.moon_hint": "Shown behind the plan with any background, from 3° above the horizon, except around new moon; computed from the home coordinates in Home Assistant.",
+  "gs.moon_status_shown": "Now: shown ({alt}° above the horizon, {pct}% lit).",
+  "gs.moon_status_no_home": "Now: not shown (the home location is not set in Home Assistant).",
+  "gs.moon_status_day_sun": "Now: not shown (the sun is {sun}° above the horizon; the moon shows once it is below 6°).",
+  "gs.moon_status_day_clock": "Now: not shown (daytime by the clock, 08:00–18:00: Home Assistant has no sun.sun data).",
+  "gs.moon_status_low": "Now: not shown (the moon is at {alt}°; it shows from 3° above the horizon).",
+  "gs.moon_status_new": "Now: not shown (new moon, {pct}% lit; it shows from 3%).",
   "gs.error_glow_radius": "Enter a radius greater than zero.",
   "gs.error_north": "Enter a whole number between 0° and 359°.",
   "gs.opacity_of": "{name} opacity",
diff --git a/src/i18n/settings/fr.json b/src/i18n/settings/fr.json
index d5cdc479..6d084859 100644
--- a/src/i18n/settings/fr.json
+++ b/src/i18n/settings/fr.json
@@ -56,7 +56,13 @@
   "gs.bg_theme_hint": "Fond du thème utilisé.",
   "gs.sun_rays_hint": "Tracer les rayons du soleil à travers les ouvertures des fenêtres.",
   "gs.moon": "Lune sur le plan au crépuscule et la nuit",
-  "gs.moon_hint": "Affichée sur le fond derrière le plan à partir de 3° au-dessus de l’horizon, sauf autour de la nouvelle lune ; calculée à partir des coordonnées du domicile dans Home Assistant.",
+  "gs.moon_hint": "Affichée derrière le plan quel que soit le fond, à partir de 3° au-dessus de l’horizon, sauf autour de la nouvelle lune ; calculée à partir des coordonnées du domicile dans Home Assistant.",
+  "gs.moon_status_shown": "Maintenant : affichée ({alt}° au-dessus de l’horizon, éclairée à {pct} %).",
+  "gs.moon_status_no_home": "Maintenant : non affichée (la position du domicile n’est pas définie dans Home Assistant).",
+  "gs.moon_status_day_sun": "Maintenant : non affichée (le soleil est à {sun}° au-dessus de l’horizon ; la lune apparaît dès qu’il passe sous 6°).",
+  "gs.moon_status_day_clock": "Maintenant : non affichée (jour selon l’horloge, 08:00–18:00 : Home Assistant n’a pas de données sun.sun).",
+  "gs.moon_status_low": "Maintenant : non affichée (la lune est à {alt}° ; elle apparaît à partir de 3° au-dessus de l’horizon).",
+  "gs.moon_status_new": "Maintenant : non affichée (nouvelle lune, éclairée à {pct} % ; visible à partir de 3 %).",
   "gs.error_glow_radius": "Saisissez un rayon supérieur à zéro.",
   "gs.error_north": "Saisissez un nombre entier entre 0° et 359°.",
   "gs.opacity_of": "Opacité : {name}",
diff --git a/src/i18n/settings/ru.json b/src/i18n/settings/ru.json
index 10992e91..72b801b2 100644
--- a/src/i18n/settings/ru.json
+++ b/src/i18n/settings/ru.json
@@ -56,7 +56,13 @@
   "gs.bg_theme_hint": "Используется фон темы.",
   "gs.sun_rays_hint": "Рисовать солнечные лучи через оконные проёмы.",
   "gs.moon": "Луна на плане в сумерках и ночью",
-  "gs.moon_hint": "Видна на фоне за планом при высоте от 3° над горизонтом, кроме новолуния; положение считается по координатам дома из Home Assistant.",
+  "gs.moon_hint": "Видна за планом при любом фоне, от 3° над горизонтом, кроме новолуния; положение считается по координатам дома из Home Assistant.",
+  "gs.moon_status_shown": "Сейчас: показывается (на {alt}° над горизонтом, освещено {pct} %).",
+  "gs.moon_status_no_home": "Сейчас: не показывается (в Home Assistant не заданы координаты дома).",
+  "gs.moon_status_day_sun": "Сейчас: не показывается (Солнце на {sun}° над горизонтом, луна видна, когда оно ниже 6°).",
+  "gs.moon_status_day_clock": "Сейчас: не показывается (день по часам, 08:00–18:00: в Home Assistant нет данных sun.sun).",
+  "gs.moon_status_low": "Сейчас: не показывается (луна на высоте {alt}°, видна от 3° над горизонтом).",
+  "gs.moon_status_new": "Сейчас: не показывается (новолуние, освещено {pct} %, видна от 3 %).",
   "gs.error_glow_radius": "Введите радиус больше нуля.",
   "gs.error_north": "Введите целое число от 0° до 359°.",
   "gs.opacity_of": "Прозрачность: {name}",
diff --git a/src/moon-gate.ts b/src/moon-gate.ts
index 6c96ff26..863760c3 100644
--- a/src/moon-gate.ts
+++ b/src/moon-gate.ts
@@ -1,50 +1,94 @@
 /**
  * The moon's only foothold in the initial View graph (#661, C7): whether the
  * lazy `moon-runtime` chunk is wanted, and one load per page for every card on
- * it. It is wanted when the moon is switched on, the environment exists (the
- * effective background follows the sun, on a View surface) and it is not
- * daytime. Everything else — astronomy, art, element, its 30 s ticker — lives
- * in the chunk.
+ * it. It is wanted when the moon is switched on on a View surface and it is
+ * not daytime — with any background (#718 K1): over "Follow the Sun" the moon
+ * lives in the environment, over a static one in its own sky layer — and when
+ * General settings open, for the status line (#718 K6). Everything else —
+ * astronomy, art, element, layer, its 30 s ticker, the status — lives in the
+ * chunk.
  *
  * The contract of the other lazy runtimes, in the fewest bytes (the initial
  * graph sits at its budget): a chunk from another build is never installed and
  * never asked for again; a failed load leaves no moon and is retried at most
- * every 30 s, on the next render, from the content-hashed URL with a fresh
+ * every 30 s, on the next request, from the content-hashed URL with a fresh
  * query so the browser's cached failure is not replayed.
  */
 import { nothing, type TemplateResult } from 'lit';
 import { ENTRY_BUILD_FINGERPRINT } from './editor-runtime-loader';
-import type { DayCycleState } from './sun';
+import { dayCycleFingerprint, resolveDayCycle, type DayCycleState } from './sun';
 
 type MoonRuntime = typeof import('./moon-runtime');
 export type MoonHost = import('./moon-runtime').MoonHost;
 
 const MOON_RETRY_ASSET = '__HOUSEPLAN_MOON_RETRY_ASSET__';
 let runtime: MoonRuntime | null = null;
+/** The load in flight: every caller meanwhile waits for the same one. */
+let loading: Promise<void> | null = null;
 /** Earliest next attempt; 0 before the first, Infinity after a foreign build. */
 let nextAttempt = 0;
 
+const moonOn = (settings: unknown): boolean => (settings as { moon?: unknown } | null | undefined)?.moon === true;
+
 /**
- * The moon element for `renderDayCycleEnvironment`. `state` is the
- * environment (null: no environment, so no moon); `settings` the global
- * settings, where only an explicit `moon: true` counts (C1). Nothing until the
- * chunk is here; the card that asked re-renders when it arrives.
+ * `use` gets the chunk: at once when it is here, else when the page-wide load
+ * brings it. A failure, a load still barred by the 30 s retry or a chunk of
+ * another build never call it.
  */
-export function moonLayer(
-  host: MoonHost | undefined, settings: unknown, state: DayCycleState | null,
-): TemplateResult | typeof nothing {
-  if (!host || !state || (settings as { moon?: unknown } | null | undefined)?.moon !== true) return nothing;
-  if (!runtime && state.phase !== 'day' && Date.now() >= nextAttempt) {
+export function withMoon(use: (moon: MoonRuntime) => void): void {
+  if (runtime) { use(runtime); return; }
+  if (!loading && Date.now() >= nextAttempt) {
     const retry = nextAttempt > 0;
     nextAttempt = Date.now() + 30_000;
-    (retry
+    loading = (retry
       ? import(/* @vite-ignore */ new URL(`${MOON_RETRY_ASSET}?${nextAttempt}`, import.meta.url).href) as Promise<MoonRuntime>
       : import('./moon-runtime')
     ).then((module) => {
-      if (module.MOON_RUNTIME_FINGERPRINT !== ENTRY_BUILD_FINGERPRINT) { nextAttempt = Infinity; return; }
-      runtime = module;
-      host.requestUpdate();
-    }, () => undefined);
+      loading = null;
+      if (module.MOON_RUNTIME_FINGERPRINT === ENTRY_BUILD_FINGERPRINT) runtime = module;
+      else nextAttempt = Infinity;
+    }, () => { loading = null; });
   }
-  return runtime?.renderMoon(host, settings, state.phase) ?? nothing;
+  void loading?.then(() => { if (runtime) use(runtime); });
+}
+
+/**
+ * #718 K1/K5: the phase the moon uses where no environment is drawn — a static
+ * background (global or the space's own), the moon switched on, a View
+ * surface (`viewWeight` of #101 above 0). Anything else computes nothing.
+ */
+export function moonSkyState(
+  settings: unknown, daynight: boolean, viewWeight: number, hass: unknown, now: Date | number = new Date(),
+): DayCycleState | null {
+  return !daynight && viewWeight > 0 && moonOn(settings) ? resolveDayCycle(hass, now) : null;
+}
+
+/**
+ * #718 K5: what the 30 s clock ticker compares — the whole environment (its
+ * sun moves every minute), but only the phase of the moon's sky, so a static
+ * background re-renders at 08:00 and 18:00, not every minute.
+ */
+export function dayCycleClock(
+  env: DayCycleState | null, sky: DayCycleState | null,
+): [DayCycleState | null, string] {
+  return [env ?? sky, env ? dayCycleFingerprint(env) : sky ? sky.phase : ''];
+}
+
+/**
+ * The moon element. `state` is the day-cycle sample (null: no moon);
+ * `settings` the global settings, where only an explicit `moon: true` counts
+ * (C1). Without `sky` the element goes into `renderDayCycleEnvironment`; with
+ * it (the View weight) it comes in its own layer for a static background.
+ * Nothing until the chunk is here; the card that asked re-renders when it
+ * arrives.
+ */
+export function moonLayer(
+  host: MoonHost | undefined, settings: unknown, state: DayCycleState | null, sky?: number,
+): TemplateResult | typeof nothing {
+  if (!host || !state || !moonOn(settings)) return nothing;
+  if (!runtime && state.phase !== 'day') withMoon(() => host.requestUpdate());
+  if (!runtime) return nothing;
+  return sky === undefined
+    ? runtime.renderMoon(host, settings, state.phase)
+    : runtime.renderMoonSky(host, settings, state.phase, sky);
 }
diff --git a/src/moon-runtime.ts b/src/moon-runtime.ts
index ff5733b7..8ed791af 100644
--- a/src/moon-runtime.ts
+++ b/src/moon-runtime.ts
@@ -1,13 +1,17 @@
 /**
  * The lazy moon chunk (#661, C7): astronomy, the designer's art, the element
- * template and the moon's own 30 s ticker. `moon-gate.ts` imports it only
- * while the moon is switched on, the background follows the sun and it is not
- * daytime; until then the initial View graph carries none of this.
+ * template, the moon's own 30 s ticker and the status of General settings
+ * (#718). `moon-gate.ts` imports it while the moon is switched on on a View
+ * surface and it is not daytime, or when General settings open; until then
+ * the initial View graph carries none of this.
  *
- * One element inside `.hp-day-cycle-env`, after the four phase layers: above
- * the gradients and the sun glow, below the plan paper and everything else
- * (owner decision 7). Its styles travel with it, so the View card, kiosk and
- * `houseplan-space-card` get the same moon without growing their own CSS.
+ * One element behind the plan. Over "Follow the Sun" it is the last child of
+ * `.hp-day-cycle-env`, after the four phase layers: above the gradients and
+ * the sun glow, below the plan paper and everything else (owner decision 7).
+ * With a static background there is no environment (#718 K3): the same element
+ * stands in its own layer `.hp-moon-sky`, the first child of the scene, under
+ * the plan by DOM order. Its styles travel with it, so the View card, kiosk
+ * and `houseplan-space-card` get the same moon without growing their own CSS.
  */
 import { html, nothing, type TemplateResult } from 'lit';
 import { MOON_ART } from './moon-art.generated';
@@ -16,6 +20,9 @@ import {
 } from './moon';
 import type { DayCyclePhase } from './sun';
 
+/** #718 K7: the status of General settings, judged where the moon is decided. */
+export { moonStatus } from './moon';
+
 export const MOON_RUNTIME_FINGERPRINT = '__HOUSEPLAN_SOURCE_FINGERPRINT__';
 
 /** The card that shows the moon: the View card or `houseplan-space-card`. */
@@ -30,12 +37,16 @@ export interface MoonHost {
 export const MOON_TICK_MS = 30_000;
 
 /**
- * C6: box `min(200px, 25cqmin)` measured on the scene (the environment is the
- * size container), 5 % inset, never moved by pan or zoom, never hit-tested.
+ * C6: box `min(200px, 25cqmin)` measured on the scene (the environment or the
+ * sky layer is the size container, both the whole scene), 5 % inset, never
+ * moved by pan or zoom, never hit-tested.
  * C4: opacity only, 2 s on the background curve; reduced motion — instant.
- * C8: no CSS filter and no will-change on the element.
+ * C8: no CSS filter and no will-change on the element. #718 K3: the sky layer
+ * has no z-index either — it lies under the plan by DOM order, as the
+ * environment does.
  */
-const MOON_CSS = '.hp-day-cycle-env{container-type:size}'
+const MOON_CSS = '.hp-day-cycle-env,.hp-moon-sky{container-type:size}'
+  + '.hp-moon-sky{position:absolute;inset:0;overflow:hidden;pointer-events:none}'
   + '.hp-moon{--hp-moon-box:min(200px,25cqmin);position:absolute;'
   + 'left:calc(var(--hp-moon-box)*.05);top:calc(var(--hp-moon-box)*.05);'
   + 'width:var(--hp-moon-box);height:var(--hp-moon-box);opacity:0;pointer-events:none;'
@@ -63,8 +74,8 @@ function forget(host: MoonHost, watch: MoonWatch): void {
 /**
  * C3: between renders only the clock moves the moon. Every 30 s the tick
  * recomputes it from the last rendered inputs; an equal fingerprint costs no
- * render. A host that re-rendered without a moon (switched off, editor mode,
- * static background) or left the page drops its ticker; a hidden page skips.
+ * render. A host that re-rendered without a moon (switched off, editor mode)
+ * or left the page drops its ticker; a hidden page skips.
  */
 export function moonTick(host: MoonHost, now: Date = new Date()): void {
   const watch = watches.get(host);
@@ -93,7 +104,7 @@ function remember(host: MoonHost, settings: unknown, phase: DayCyclePhase, view:
 }
 
 /**
- * The element stays in the environment while the moon is switched on, at
+ * The element stays in its parent while the moon is switched on, at
  * opacity 0 when hidden, so rising, setting, the new-moon threshold and the
  * day phase all fade (C4). A freshly created element takes its final state at
  * once: the first appearance after a page or chunk load is not animated.
@@ -120,3 +131,15 @@ export function renderMoon(
     <use href="#hp-moon-art" mask="url(#hp-moon-phase)"></use>
   </svg>`;
 }
+
+/**
+ * #718 K3/K4: the moon without an environment — a scene-sized layer, first
+ * child of the scene, fading with the View weight of the #101 transition as
+ * the environment does. Inside, the very element of the environment.
+ */
+export function renderMoonSky(
+  host: MoonHost, settings: unknown, phase: DayCyclePhase, viewWeight: number, now: Date = new Date(),
+): TemplateResult {
+  return html`<div class="hp-moon-sky" aria-hidden="true"
+      style="opacity:${Math.min(1, Math.max(0, viewWeight)).toFixed(4)}">${renderMoon(host, settings, phase, now)}</div>`;
+}
diff --git a/src/moon.ts b/src/moon.ts
index de7be0e9..a9f04f01 100644
--- a/src/moon.ts
+++ b/src/moon.ts
@@ -1,7 +1,8 @@
 /**
- * The moon over the "Follow the Sun" background (#661): pure astronomy,
- * visibility rules and the phase mask. No DOM, no Lit — the lazy
- * `moon-runtime` chunk renders from these, unit tests call them directly.
+ * The moon behind the plan (#661; with any background since #718): pure
+ * astronomy, visibility rules, the status line and the phase mask. No DOM, no
+ * Lit — the lazy `moon-runtime` chunk renders from these, unit tests call them
+ * directly.
  *
  * Home Assistant publishes no moon altitude, so the card computes it from
  * `hass.config.latitude/longitude` and the browser clock: the short Meeus
@@ -9,7 +10,7 @@
  * Checked against JPL Horizons (airless) on the twelve points of the issue:
  * altitude within 1.5°, illumination within 2.5 percentage points.
  */
-import type { DayCyclePhase } from './sun';
+import type { DayCyclePhase, DayCycleSource } from './sun';
 
 /**
  * C1: the same 3° as the window rays (`RAY_ELEVATION_MIN`), so both lights
@@ -112,10 +113,9 @@ export interface MoonView {
 const finite = (value: unknown): value is number => typeof value === 'number' && Number.isFinite(value);
 
 /**
- * C1 for an existing environment. The environment itself is the gate for the
- * rest: it exists only on a View surface whose effective background follows
- * the sun (`bg_mode` per space, then global). `settings` are the global
- * settings, `config` is `hass.config`.
+ * C1 (#718 K1): the card is the gate for the rest — a View surface, any
+ * background; `phase` is `resolveDayCycle` whether or not an environment is
+ * drawn. `settings` are the global settings, `config` is `hass.config`.
  */
 export function moonView(settings: unknown, phase: DayCyclePhase, config: unknown, now: Date): MoonView {
   const { fraction } = moonIllumination(now);
@@ -126,6 +126,64 @@ export function moonView(settings: unknown, phase: DayCyclePhase, config: unknow
   return { visible: moonShownAt(phase, moonPosition(now, latitude, longitude).altitude, fraction), k };
 }
 
+/** #718 K7: why the moon is or is not shown — the first reason that holds, in this order. */
+export type MoonStatusReason = 'shown' | 'no_home' | 'day_sun' | 'day_clock' | 'low' | 'new';
+
+/** The reason with its numbers already rounded: the dialog only puts them into the text. */
+export interface MoonStatus {
+  reason: MoonStatusReason;
+  /** Moon altitude, whole degrees (`shown`, `low`). */
+  alt?: number;
+  /** Illuminated share, whole per cent (`shown`, `new`). */
+  pct?: number;
+  /** The `sun.sun` elevation, whole degrees (`day_sun`). */
+  sun?: number;
+}
+
+/** The sky the status is judged on, as ready numbers (AC9). */
+export interface MoonSky {
+  /** Finite `hass.config.latitude/longitude`. */
+  home: boolean;
+  phase: DayCyclePhase;
+  source: DayCycleSource;
+  /** `sun.sun` elevation; null without it. */
+  sun: number | null;
+  altitude: number;
+  fraction: number;
+}
+
+/**
+ * #718 K7/K8: no home, day, below 3°, under 3 % — the first that holds; else
+ * shown, decided by the same `moonShownAt` as the element. A hidden reason
+ * never shows the threshold it missed: «at 3°, shows from 3°» reads as a bug,
+ * so its number stops at 2.
+ */
+export function moonStatusOf(sky: MoonSky): MoonStatus {
+  if (!sky.home) return { reason: 'no_home' };
+  if (sky.phase === 'day') return sky.source === 'sun' ? { reason: 'day_sun', sun: Math.round(sky.sun ?? 0) } : { reason: 'day_clock' };
+  const alt = Math.round(sky.altitude);
+  const pct = Math.round(sky.fraction * 100);
+  if (moonShownAt(sky.phase, sky.altitude, sky.fraction)) return { reason: 'shown', alt, pct };
+  return sky.altitude < MOON_ELEVATION_MIN ? { reason: 'low', alt: Math.min(alt, 2) } : { reason: 'new', pct: Math.min(pct, 2) };
+}
+
+/**
+ * #718 K7: the status for `hass.config` and a day-cycle sample taken at `now`,
+ * as if the switch were on — the moon no longer depends on the background, so
+ * one status serves the whole installation. `sun` is the `sun.sun` elevation.
+ */
+export function moonStatus(
+  config: unknown, state: { phase: DayCyclePhase; source: DayCycleSource }, sun: number | null, now: Date,
+): MoonStatus {
+  const { latitude, longitude } = (config ?? {}) as { latitude?: unknown; longitude?: unknown };
+  const home = finite(latitude) && finite(longitude);
+  return moonStatusOf({
+    home, phase: state.phase, source: state.source, sun,
+    altitude: home ? moonPosition(now, latitude, longitude).altitude : 0,
+    fraction: moonIllumination(now).fraction,
+  });
+}
+
 /** C3: equal fingerprint → no re-render. The lit side is fixed, so k is all the shape. */
 export function moonFingerprint(view: MoonView): string {
   return `${view.visible ? 1 : 0}|${view.k.toFixed(2)}`;
diff --git a/src/space-card.ts b/src/space-card.ts
index 3e17cbba..894bf09b 100644
--- a/src/space-card.ts
+++ b/src/space-card.ts
@@ -37,8 +37,9 @@ import {
   type PageVisibilitySignal,
 } from './visual-continuity';
 import {
-  bgModeOf, resolveDayCycle, dayCycleFingerprint, type DayCycleState,
+  bgModeOf, resolveDayCycle, type DayCycleState,
 } from './sun';
+import { dayCycleClock, moonSkyState } from './moon-gate';
 import { PointerModalityController } from './pointer-modality';
 import { resolvedSvgScreenBlend, svgScreenBlendSupported } from './glow-blend';
 import {
@@ -167,31 +168,35 @@ class HouseplanSpaceCard extends LitElement {
     });
   }
 
-  private _dayCycleState(now: Date | number = new Date()): DayCycleState | null {
+  /**
+   * The clock ticker's sample: the environment over "Follow the Sun", else the
+   * moon's sky over a static background — compared by its phase only (#718 K5).
+   */
+  private _dayCycleClock(now: Date | number = new Date()): [DayCycleState | null, string] {
     const cfg = this._snap?.config;
-    if (!cfg || !this._config) return null;
+    if (!cfg || !this._config) return [null, ''];
     const spaceSettings = cfg.spaces?.find((space: any) => space.id === this._config?.space)?.settings || {};
-    if (bgModeOf(cfg.settings, spaceSettings) !== 'daynight') return null;
-    return resolveDayCycle(this._renderDeviceSnapshot?.hass || this.hass, now);
+    const daynight = bgModeOf(cfg.settings, spaceSettings) === 'daynight';
+    const hass = this._renderDeviceSnapshot?.hass || this.hass;
+    return dayCycleClock(daynight ? resolveDayCycle(hass, now) : null, moonSkyState(cfg.settings, daynight, 1, hass, now));
   }
 
   private _dayCycleTick = (): void => {
     if (!this.isConnected || this.ownerDocument.visibilityState === 'hidden') return;
-    const state = this._dayCycleState();
+    const [state, key] = this._dayCycleClock();
     if (!state) {
       if (this._dayCycleTimer) { window.clearInterval(this._dayCycleTimer); this._dayCycleTimer = 0; }
       this._dayCycleClockKey = '';
       return;
     }
-    const key = dayCycleFingerprint(state);
     if (key === this._dayCycleClockKey) return;
     this._dayCycleClockKey = key;
     this.requestUpdate();
   };
 
   private _syncDayCycleClock(): void {
-    const state = this._dayCycleState();
-    this._dayCycleClockKey = state ? dayCycleFingerprint(state) : '';
+    const [state, key] = this._dayCycleClock();
+    this._dayCycleClockKey = key;
     const needsTimer = state?.source === 'clock'
       && this.ownerDocument.visibilityState !== 'hidden' && this.isConnected;
     if (needsTimer && !this._dayCycleTimer) {
diff --git a/src/space-render.ts b/src/space-render.ts
index 25d4c712..907ec708 100644
--- a/src/space-render.ts
+++ b/src/space-render.ts
@@ -25,7 +25,7 @@ import {
 import { DEFAULT_ICON_RULES, compileIconRules } from './rules';
 import { t, type Lang } from './i18n';
 import { bgModeOf, resolveDayCycle } from './sun';
-import { moonLayer, type MoonHost } from './moon-gate';
+import { moonLayer, moonSkyState, type MoonHost } from './moon-gate';
 import { dayCycleStageVars, renderDayCycleEnvironment } from './day-cycle-render';
 import type { DevItem, OpeningCfg, ServerConfig } from './types';
 import { floorMinusBodies, physicalBodyParts, polyclipPathD } from './physical-geometry';
@@ -670,9 +670,12 @@ export function renderSpaceStatic(o: StaticRenderOpts): TemplateResult | null {
   });
   // The static card paints the same four-phase environment as full View.
   // Wedges stay full-card-only; the decorative background is independent.
+  // #718: a static background gets the moon in its own sky layer instead.
   const spaceSettings = (o.cfg.spaces.find((sp: any) => sp.id === o.spaceId) as any)?.settings || {};
-  const dayCycle = bgModeOf(o.cfg?.settings, spaceSettings) === 'daynight'
-    ? resolveDayCycle(planHass, o.dayCycleNow ?? new Date()) : null;
+  const daynight = bgModeOf(o.cfg?.settings, spaceSettings) === 'daynight';
+  const dayCycleNow = o.dayCycleNow ?? new Date();
+  const dayCycle = daynight ? resolveDayCycle(planHass, dayCycleNow) : null;
+  const moonSky = moonSkyState(o.cfg?.settings, daynight, 1, planHass, dayCycleNow);
   const stageBg = stageBgOf(o.cfg?.settings, disp);
 
   // Opaque plan paper, same contract as the full card (docs/DECOR-EDITOR.md §3.3):
@@ -931,6 +934,7 @@ export function renderSpaceStatic(o: StaticRenderOpts): TemplateResult | null {
       ?inert=${!!o.inert}
       style="aspect-ratio:${vb[2]}/${vb[3]}${stageBg ? ';background:' + stageBg : ''};--hp-cell-visual-scale:${gridVisualScale(cellCm)};--wall-fill:${colors.wall_fill.c};--wall-fill-op:${colors.wall_fill.a}${dayCycle ? `;${dayCycleStageVars(dayCycle)}` : ''}">
       ${renderDayCycleEnvironment(dayCycle, 1, moonLayer(o.moonHost, o.cfg?.settings, dayCycle))}
+      ${moonLayer(o.moonHost, o.cfg?.settings, moonSky, 1)}
       ${dayCycle && paperShapes.length ? svg`<svg class="hp-paper-outline-svg"
           viewBox="${vb[0]} ${vb[1]} ${vb[2]} ${vb[3]}"
           preserveAspectRatio="xMidYMid meet" aria-hidden="true" pointer-events="none">
diff --git a/test/bundle-assets.test.mjs b/test/bundle-assets.test.mjs
index 06d648b7..cf480faa 100644
--- a/test/bundle-assets.test.mjs
+++ b/test/bundle-assets.test.mjs
@@ -304,6 +304,12 @@ test('bundle manifest separates static initial graph from dynamic editor graph',
   // lazy moon graph — the builder subtracts initial) is refused by name.
   assert.throws(() => assertBundleBudget({ ...manifest, lazyMoonFiles: [] }, 1_000_000, undefined, ...lazyCeilings),
     /bundle has no lazy moon graph/);
+  // #718 AC13: the status line reaches the chunk through the gate; the editor
+  // graph never holds the moon's own files.
+  assert.equal(manifest.lazyEditorFiles.some((path) => manifest.lazyMoonFiles.includes(path)), false);
+  assert.throws(() => assertBundleBudget({
+    ...manifest, lazyEditorFiles: [...manifest.lazyEditorFiles, ...manifest.lazyMoonFiles],
+  }, 1_000_000, undefined, ...lazyCeilings), /lazy editor graph overlaps lazy moon graph/);
 });
 
 test('#486 Rollup names both stable entries explicitly', async () => {
diff --git a/test/golden-matrix.test.mjs b/test/golden-matrix.test.mjs
index 1eaa1f89..9e91955e 100644
--- a/test/golden-matrix.test.mjs
+++ b/test/golden-matrix.test.mjs
@@ -446,7 +446,7 @@ test('sun-ray golden requires browser-painted light from a state-only sun entity
   assert.ok(scenario);
   const fixture = prepareGoldenFixture(scenario);
   const space = fixture.config.spaces.find((item) => item.id === scenario.space);
-  assert.equal(GOLDEN_MATRIX_VERSION, 69);
+  assert.equal(GOLDEN_MATRIX_VERSION, 70);
   assert.equal(space.settings.sun_rays, true);
   assert.equal(scenario.northDeg, 90,
     'the sign-sensitive golden must keep a non-zero north direction');
@@ -940,7 +940,7 @@ test('issue 570 Stage 4 reuses the historical iso goldens for visual handoff cov
 
 test('#673 Stage 6 designer acceptance scenes are canonical golden entries', () => {
   const ids = STAGE6_ACCEPTANCE_SCENARIOS.map((scenario) => scenario.id);
-  assert.equal(GOLDEN_MATRIX_VERSION, 69);
+  assert.equal(GOLDEN_MATRIX_VERSION, 70);
   assert.deepEqual(ids, [
     'isometric-stage6-light-lightfloor',
     'isometric-stage6-light-darkfloor',
@@ -1244,3 +1244,31 @@ test('#661 AC7 moon scenes: fixed home and clock, moon on, the old day-cycle fra
     assert.equal(prepareGoldenFixture(scenario).config.settings?.moon, undefined, id);
   }
 });
+
+test('#718 AC8 static-background moon scenes: the chosen colour, the sky layer, the dialog waits for the line', () => {
+  const byId = (id) => GOLDEN_SCENARIOS.find((scenario) => scenario.id === id);
+  const white = byId('static-bg-moon-gibbous-white-light');
+  const dark = byId('static-bg-moon-crescent-south-dark');
+  assert.deepEqual(white.moon, { clock: '2026-10-21T18:00:00Z', latitude: 55.75, longitude: 37.62, k: '0.79' });
+  assert.deepEqual(dark.moon, { clock: '2026-10-14T09:00:00Z', latitude: -33.87, longitude: 151.21, k: '0.14' });
+  for (const [scenario, theme, color] of [[white, 'light', '#ffffff'], [dark, 'dark', '#202126']]) {
+    assert.equal(scenario.capture, 'stage');
+    assert.equal(scenario.theme, theme);
+    assert.equal(scenario.bgMode, 'static');
+    const fixture = prepareGoldenFixture(scenario);
+    assert.equal(fixture.config.settings.moon, true);
+    const space = fixture.config.spaces.find((item) => item.id === scenario.space);
+    assert.equal(space.settings.bg_mode, 'static');
+    assert.equal(space.settings.bg_color, color);
+  }
+  // The harness checks the parent by background and waits for the status line
+  // in both General settings frames before the screenshot.
+  const harness = readFileSync(new URL('../demo/golden/harness.mjs', import.meta.url), 'utf8');
+  assert.match(harness, /scenario\.bgMode === 'daynight'\s+\? card\.renderRoot\.querySelector\('\.hp-day-cycle-env'\)\s+: card\.renderRoot\.querySelector\('\.hp-moon-sky'\)/);
+  for (const dialog of ['general-color', 'general-help']) {
+    const branch = harness.slice(harness.indexOf(`scenario.dialog === '${dialog}'`));
+    assert.match(branch.slice(0, 200), /await moonStatusSettled\(card\);/, dialog);
+  }
+  assert.match(harness, /hp-dialog \[data-moon-status\]/);
+  assert.match(harness, /innerWidth <= 390/);
+});
diff --git a/test/moon-settings.test.mjs b/test/moon-settings.test.mjs
index 1cd44e88..db335732 100644
--- a/test/moon-settings.test.mjs
+++ b/test/moon-settings.test.mjs
@@ -1,11 +1,13 @@
 // #661 AC10: the moon switch in General settings — «Sun and Moon» section,
 // reset to on, save writes `true` or removes the key; its strings exist in all
-// four dictionaries. The dialog is a lazy Lit module (its layout is read as a
-// source contract); reading and writing the key are executed.
+// four dictionaries. #718: the status line under it (AC14, K7). The dialog is
+// a lazy Lit module (its layout is read as a source contract); reading and
+// writing the key and the status of an opening are executed.
 import test from 'node:test';
 import assert from 'node:assert/strict';
 import { readFileSync } from 'node:fs';
-import { moonDraftOf, writeMoonSetting } from '../test-build/editors/general-form-state.js';
+import { generalDraftKey, moonDraftOf, writeMoonSetting } from '../test-build/editors/general-form-state.js';
+import { moonStatusOf, openMoonStatus } from '../test-build/editors/moon-status.js';
 
 const read = (path) => readFileSync(new URL(`../${path}`, import.meta.url), 'utf8');
 const json = (path) => JSON.parse(read(path));
@@ -19,7 +21,10 @@ test('#661 AC10: the switch sits in the «Sun and Moon» card under «Sunlight t
   assert.ok(rays > 0 && moon > rays, 'moon row follows the sun-rays row');
   const row = sun.slice(moon, sun.indexOf('})}', moon));
   assert.match(row, /icon: 'mdi:moon-waning-crescent'/);
-  assert.match(row, /title: st\('gs\.moon'\), caption: st\('gs\.moon_hint'\)/);
+  assert.match(row, /title: st\('gs\.moon'\),/);
+  // #718 K7: the hint alone until the chunk judged this opening, then the status as its second line.
+  assert.match(row, /caption: moonStatus\s+\? html`\$\{st\('gs\.moon_hint'\)\}<span style="display:block" data-moon-status=\$\{moonStatus\.reason\}>\$\{moonStatusText\(moonStatus, st\)\}<\/span>`\s+: st\('gs\.moon_hint'\)/);
+  assert.doesNotMatch(row, /aria-live/);
   assert.match(row, /checked: d\.moon, onChange: \(v\) => set\(\{ moon: v \}\)/);
   const reset = dialog.slice(dialog.indexOf("${t('gs.reset')}") - 600, dialog.indexOf("${t('gs.reset')}"));
   assert.match(reset, /moon: true/, 'reset to defaults switches the moon on (new installations)');
@@ -51,3 +56,102 @@ test('#661 AC10: strings in all four dictionaries, section renamed', () => {
   assert.equal(json('src/i18n/settings/ru.json')['gs.moon'], 'Луна на плане в сумерках и ночью');
   assert.equal(json('src/i18n/settings/en.json')['gs.moon'], 'Moon over the plan at dusk and night');
 });
+
+/** #718: the seven keys, RU and EN verbatim from the specification. */
+const MOON_KEYS = {
+  'gs.moon_hint': {
+    ru: 'Видна за планом при любом фоне, от 3° над горизонтом, кроме новолуния; положение считается по координатам дома из Home Assistant.',
+    en: 'Shown behind the plan with any background, from 3° above the horizon, except around new moon; computed from the home coordinates in Home Assistant.',
+  },
+  'gs.moon_status_shown': {
+    ru: 'Сейчас: показывается (на {alt}° над горизонтом, освещено {pct}\u00a0%).',
+    en: 'Now: shown ({alt}° above the horizon, {pct}% lit).',
+  },
+  'gs.moon_status_no_home': {
+    ru: 'Сейчас: не показывается (в Home Assistant не заданы координаты дома).',
+    en: 'Now: not shown (the home location is not set in Home Assistant).',
+  },
+  'gs.moon_status_day_sun': {
+    ru: 'Сейчас: не показывается (Солнце на {sun}° над горизонтом, луна видна, когда оно ниже 6°).',
+    en: 'Now: not shown (the sun is {sun}° above the horizon; the moon shows once it is below 6°).',
+  },
+  'gs.moon_status_day_clock': {
+    ru: 'Сейчас: не показывается (день по часам, 08:00\u201318:00: в Home Assistant нет данных sun.sun).',
+    en: 'Now: not shown (daytime by the clock, 08:00\u201318:00: Home Assistant has no sun.sun data).',
+  },
+  'gs.moon_status_low': {
+    ru: 'Сейчас: не показывается (луна на высоте {alt}°, видна от 3° над горизонтом).',
+    en: 'Now: not shown (the moon is at {alt}°; it shows from 3° above the horizon).',
+  },
+  'gs.moon_status_new': {
+    ru: 'Сейчас: не показывается (новолуние, освещено {pct}\u00a0%, видна от 3\u00a0%).',
+    en: 'Now: not shown (new moon, {pct}% lit; it shows from 3%).',
+  },
+};
+
+test('#718 AC14: seven keys in all four dictionaries, one placeholder set, RU and EN as specified', () => {
+  const placeholders = (text) => [...text.matchAll(/\{(\w+)\}/g)].map((match) => match[1]).sort();
+  for (const [key, expected] of Object.entries(MOON_KEYS)) {
+    const reference = placeholders(expected.en);
+    for (const lang of ['en', 'ru', 'de', 'fr']) {
+      const text = json(`src/i18n/settings/${lang}.json`)[key];
+      assert.ok(typeof text === 'string' && text.trim(), `${lang} ${key}`);
+      assert.deepEqual(placeholders(text), reference, `${lang} ${key}: placeholders`);
+    }
+    assert.equal(json('src/i18n/settings/ru.json')[key], expected.ru, `ru ${key}`);
+    assert.equal(json('src/i18n/settings/en.json')[key], expected.en, `en ${key}`);
+  }
+  // #502: called by literal, never as `gs.moon_status_${reason}`.
+  const source = read('src/editors/moon-status.ts');
+  for (const reason of ['shown', 'no_home', 'day_sun', 'day_clock', 'low', 'new']) {
+    assert.match(source, new RegExp(`'gs\\.moon_status_${reason}'`));
+  }
+  assert.doesNotMatch(source, /gs\.moon_status_\$\{/);
+});
+
+function dialogHost(hass) {
+  return {
+    hass,
+    updates: 0,
+    _settingsDialog: { moon: true, bgMode: 'static', busy: false, glowRadiusInput: '3', northDegInput: '' },
+    requestUpdate() { this.updates++; },
+  };
+}
+const NIGHT = { azimuth: 0, elevation: -12, rising: false };
+const hassWith = (sun) => ({
+  config: { latitude: 55.75, longitude: 37.62 },
+  states: sun ? { 'sun.sun': { attributes: sun } } : {},
+});
+const settle = () => new Promise((done) => setTimeout(done, 300));
+
+test('#718 K7: one snapshot per opening, outside the draft; a closed opening’s result is dropped', async () => {
+  const at = new Date('2026-10-21T18:00:00Z');
+  const host = dialogHost(hassWith(NIGHT));
+  const draftKey = generalDraftKey(host._settingsDialog);
+  // First opening: the chunk is not here yet, and the dialog closes before it arrives.
+  openMoonStatus(host, at);
+  assert.equal(moonStatusOf(host), undefined, 'no line while the chunk loads');
+  host._settingsDialog = null;
+  await settle();
+  assert.equal(moonStatusOf(host), undefined, 'the closed opening’s result is dropped');
+  assert.equal(host.updates, 0);
+  // Second opening after the sun rose: its own snapshot, at once (the chunk is here now).
+  host._settingsDialog = dialogHost()._settingsDialog;
+  host.hass = hassWith({ azimuth: 180, elevation: 40, rising: false });
+  openMoonStatus(host, at);
+  assert.deepEqual(moonStatusOf(host), { reason: 'day_sun', sun: 40 });
+  assert.equal(host.updates, 1);
+  // The snapshot is the opening's: a later state update does not change it.
+  host.hass = hassWith(NIGHT);
+  assert.deepEqual(moonStatusOf(host), { reason: 'day_sun', sun: 40 });
+  // The line is not part of the draft: its key is unchanged, the dialog is not dirty.
+  assert.equal(generalDraftKey(host._settingsDialog), draftKey);
+  // Night and the switch off in the draft: the status is still what «on» would show.
+  host._settingsDialog = { ...host._settingsDialog, moon: false };
+  openMoonStatus(host, at);
+  assert.deepEqual(moonStatusOf(host), { reason: 'shown', alt: 24, pct: 79 });
+  // No sun.sun: the clock decides — midday is day by the clock.
+  host.hass = hassWith(null);
+  openMoonStatus(host, new Date(2026, 9, 21, 12, 0));
+  assert.deepEqual(moonStatusOf(host), { reason: 'day_clock' });
+});
diff --git a/test/moon.test.mjs b/test/moon.test.mjs
index 4318fc53..617e2578 100644
--- a/test/moon.test.mjs
+++ b/test/moon.test.mjs
@@ -1,6 +1,8 @@
 // #661: the moon over the "Follow the Sun" background — astronomy (AC1),
 // visibility rules (AC2), phase mask (AC3), fingerprint and ticker (AC4) and
-// the designer pack gate. Pure: test-build modules, no browser.
+// the designer pack gate. #718: the moon with any background — the status
+// function (AC9), its equivalence with the element (AC10) and the gate of the
+// static background's sky layer (AC15). Pure: test-build modules, no browser.
 import test from 'node:test';
 import assert from 'node:assert/strict';
 import { spawnSync } from 'node:child_process';
@@ -8,11 +10,16 @@ import { readFileSync } from 'node:fs';
 import { nothing } from 'lit';
 import {
   MOON_ELEVATION_MIN, MOON_MIN_ILLUMINATION, MOON_R, MOON_SHARP_FROM,
-  moonFingerprint, moonIllumination, moonPhasePath, moonPosition, moonShownAt, moonView,
+  moonFingerprint, moonIllumination, moonPhasePath, moonPosition, moonShownAt, moonStatus, moonStatusOf,
+  moonView,
 } from '../test-build/moon.js';
-import { MOON_TICK_MS, moonTick, renderMoon } from '../test-build/moon-runtime.js';
-import { moonLayer } from '../test-build/moon-gate.js';
-import { RAY_ELEVATION_MIN, RAY_FADE_MS, bgModeOf, resolveDayCycle } from '../test-build/sun.js';
+import { MOON_TICK_MS, moonTick, renderMoon, renderMoonSky } from '../test-build/moon-runtime.js';
+import { dayCycleClock, moonLayer, moonSkyState } from '../test-build/moon-gate.js';
+import { moonStatusText } from '../test-build/editors/moon-status.js';
+import { subst } from '../test-build/logic.js';
+import {
+  RAY_ELEVATION_MIN, RAY_FADE_MS, bgModeOf, dayCycleFingerprint, dayCyclePhaseFromSun, resolveDayCycle, sunStateOf,
+} from '../test-build/sun.js';
 import { renderDayCycleEnvironment } from '../test-build/day-cycle-render.js';
 import { moonArtFromSvg, validateMoonPack } from '../scripts/generate-moon-assets.mjs';
 
@@ -76,7 +83,7 @@ test('#661 AC2: visibility thresholds on both sides', () => {
   assert.equal(moonShownAt('day', 45, 1), false);
 });
 
-test('#661 AC2: only an explicit true, finite home coordinates and an environment show the moon', () => {
+test('#661 AC2: only an explicit true and finite home coordinates show the moon', () => {
   const at = new Date('2026-10-21T18:00:00Z');
   assert.equal(moonView(ON, 'night', MOSCOW, at).visible, true);
   for (const settings of [undefined, null, {}, { moon: false }, { moon: 'true' }, { moon: 1 }]) {
@@ -87,13 +94,11 @@ test('#661 AC2: only an explicit true, finite home coordinates and an environmen
     assert.equal(moonView(ON, 'night', config, at).visible, false, JSON.stringify(config));
   }
   assert.equal(moonView(ON, 'day', MOSCOW, at).visible, false);
-  // bg_mode static — global or per space — leaves no environment, so no moon.
+  // #718 AC15: a static background no longer means «no moon» — its own sky
+  // layer shows it (inverted in the #718 AC15 tests below); here only the
+  // switch and the host still refuse it.
   const host = fakeHost(MOSCOW);
   const night = { 'sun.sun': { attributes: { azimuth: 0, elevation: -12, rising: false } } };
-  for (const [global, space] of [[{ ...ON, bg_mode: 'static' }, {}], [ON, { bg_mode: 'static' }]]) {
-    const state = bgModeOf(global, space) === 'daynight' ? resolveDayCycle({ states: night }, at) : null;
-    assert.equal(moonLayer(host, global, state), nothing);
-  }
   assert.equal(moonLayer(host, { moon: false }, resolveDayCycle({ states: night }, at)), nothing);
   assert.equal(moonLayer(undefined, ON, resolveDayCycle({ states: night }, at)), nothing);
 });
@@ -237,6 +242,127 @@ test('#661 pack: generated art is fresh, and the gate refuses what the brief for
   assert.throws(() => moonArtFromSvg(`${root}<path d="${'M0 0'.repeat(9000)}"/></svg>`), /larger/);
 });
 
+/** The UX table of #718, written out here: the oracle is the specification, not the dictionary. */
+const UX = {
+  en: {
+    shown: ({ alt, pct }) => `Now: shown (${alt}° above the horizon, ${pct}% lit).`,
+    day_sun: ({ sun }) => `Now: not shown (the sun is ${sun}° above the horizon; the moon shows once it is below 6°).`,
+    low: ({ alt }) => `Now: not shown (the moon is at ${alt}°; it shows from 3° above the horizon).`,
+    new: ({ pct }) => `Now: not shown (new moon, ${pct}% lit; it shows from 3%).`,
+  },
+  ru: {
+    shown: ({ alt, pct }) => `Сейчас: показывается (на ${alt}° над горизонтом, освещено ${pct}\u00a0%).`,
+    day_sun: ({ sun }) => `Сейчас: не показывается (Солнце на ${sun}° над горизонтом, луна видна, когда оно ниже 6°).`,
+    low: ({ alt }) => `Сейчас: не показывается (луна на высоте ${alt}°, видна от 3° над горизонтом).`,
+    new: ({ pct }) => `Сейчас: не показывается (новолуние, освещено ${pct}\u00a0%, видна от 3\u00a0%).`,
+  },
+};
+const dictionaries = Object.fromEntries(['en', 'ru'].map((lang) => [lang,
+  JSON.parse(readFileSync(new URL(`../src/i18n/settings/${lang}.json`, import.meta.url), 'utf8'))]));
+const stFor = (lang) => (key, vars) => subst(dictionaries[lang][key], vars);
+
+test('#718 AC9: the status on ready numbers — the first reason, rounded and clamped', () => {
+  const sunPhase = (elevation) => dayCyclePhaseFromSun({ elevation, rising: false });
+  const rows = [
+    // home, phase, source, sun, altitude, fraction → reason, numbers, texts (minus U+2212)
+    [false, 'night', 'clock', null, 30, 0.5, { reason: 'no_home' }],
+    [false, 'day', 'sun', 40, 30, 0.5, { reason: 'no_home' }],
+    [true, sunPhase(25.4), 'sun', 25.4, 30, 0.5, { reason: 'day_sun', sun: 25 }, { sun: '25' }],
+    [true, sunPhase(6.0), 'sun', 6.0, 30, 0.5, { reason: 'day_sun', sun: 6 }, { sun: '6' }],
+    [true, sunPhase(5.9), 'sun', 5.9, 30, 0.5, { reason: 'shown', alt: 30, pct: 50 }, { alt: '30', pct: '50' }],
+    [true, 'day', 'clock', null, 30, 0.5, { reason: 'day_clock' }],
+    [true, 'night', 'clock', null, -12.3, 0.5, { reason: 'low', alt: -12 }, { alt: '\u221212' }],
+    [true, 'night', 'clock', null, 2.6, 0.5, { reason: 'low', alt: 2 }, { alt: '2' }],
+    [true, 'night', 'clock', null, -0.4, 0.5, { reason: 'low', alt: -0 }, { alt: '0' }],
+    [true, 'night', 'clock', null, -3, 0.01, { reason: 'low', alt: -3 }, { alt: '\u22123' }],
+    [true, 'night', 'clock', null, 30.6, 0.0163, { reason: 'new', pct: 2 }, { pct: '2' }],
+    [true, 'night', 'clock', null, 30, 0.026, { reason: 'new', pct: 2 }, { pct: '2' }],
+    [true, 'night', 'clock', null, 3.0, 0.03, { reason: 'shown', alt: 3, pct: 3 }, { alt: '3', pct: '3' }],
+    [true, 'night', 'clock', null, 34.4, 0.618, { reason: 'shown', alt: 34, pct: 62 }, { alt: '34', pct: '62' }],
+  ];
+  assert.equal(sunPhase(25.4), 'day');
+  assert.equal(sunPhase(6.0), 'day', 'exactly 6° is day');
+  assert.equal(sunPhase(5.9), 'dusk');
+  for (const [home, phase, source, sun, altitude, fraction, expected, shown] of rows) {
+    const label = JSON.stringify({ home, phase, source, sun, altitude, fraction });
+    const status = moonStatusOf({ home, phase, source, sun, altitude, fraction });
+    assert.deepEqual(status, expected, label);
+    if (shown) {
+      for (const lang of ['en', 'ru']) {
+        assert.equal(moonStatusText(status, stFor(lang)), UX[lang][status.reason](shown), `${lang} ${label}`);
+      }
+    }
+  }
+  // The two literal reasons, exactly as the table has them.
+  assert.equal(moonStatusText({ reason: 'no_home' }, stFor('ru')),
+    'Сейчас: не показывается (в Home Assistant не заданы координаты дома).');
+  assert.equal(moonStatusText({ reason: 'day_clock' }, stFor('en')),
+    'Now: not shown (daytime by the clock, 08:00\u201318:00: Home Assistant has no sun.sun data).');
+});
+
+test('#718 AC10: «shown» exactly when the element is visible — every hour of October, two homes', () => {
+  const suns = [-12, 0, 5.9, 6, 40]
+    .map((elevation) => ({ 'sun.sun': { attributes: { azimuth: 180, elevation, rising: false } } }))
+    .concat([{}]);
+  let visibleCount = 0;
+  let total = 0;
+  for (const place of [MOSCOW, SYDNEY]) {
+    for (let hour = 0; hour < 31 * 24; hour++) {
+      const now = new Date(Date.UTC(2026, 9, 1) + hour * 3_600_000);
+      for (const states of suns) {
+        const hass = { config: place, states };
+        const state = resolveDayCycle(hass, now);
+        const status = moonStatus(place, state, sunStateOf(hass)?.elevation ?? null, now);
+        const view = moonView({ moon: true }, state.phase, place, now);
+        const label = `${now.toISOString()} ${place.latitude} ${JSON.stringify(states)}`;
+        assert.equal(status.reason === 'shown', view.visible, label);
+        // K8: the shown per cent is the element's data-moon-k × 100.
+        if (view.visible) assert.equal(status.pct, Math.round(view.k * 100), label);
+        visibleCount += view.visible ? 1 : 0;
+        total++;
+      }
+    }
+  }
+  assert.ok(visibleCount > 500 && visibleCount < total - 500, `${visibleCount} of ${total}: both answers occur`);
+  // No home: never shown, whatever the sky.
+  assert.equal(moonStatus({}, { phase: 'night', source: 'clock' }, null, new Date('2026-10-21T18:00:00Z')).reason, 'no_home');
+});
+
+test('#718 K5: the clock ticker compares the environment whole, the moon’s sky by its phase', () => {
+  const at = (hour, minute) => resolveDayCycle({}, hour * 60 + minute);
+  assert.equal(dayCycleClock(at(18, 5), null)[1], dayCycleFingerprint(at(18, 5)));
+  assert.notEqual(dayCycleClock(at(18, 5), null)[1], dayCycleClock(at(18, 6), null)[1], 'the environment’s sun moves');
+  assert.equal(dayCycleClock(null, at(18, 5))[1], dayCycleClock(null, at(20, 59))[1], 'a phase is one key');
+  assert.notEqual(dayCycleClock(null, at(17, 59))[1], dayCycleClock(null, at(18, 0))[1], '18:00 is a new key');
+  assert.equal(dayCycleClock(null, at(18, 5))[0].phase, 'dusk');
+  assert.deepEqual(dayCycleClock(null, null), [null, '']);
+});
+
+const NIGHT_HASS = { config: MOSCOW, states: { 'sun.sun': { attributes: { azimuth: 0, elevation: -12, rising: false } } } };
+const DAY_HASS = { config: MOSCOW, states: { 'sun.sun': { attributes: { azimuth: 180, elevation: 40, rising: false } } } };
+const STATIC_ON = { moon: true, bg_mode: 'static' };
+
+// Runs before the #661 C7 test loads the chunk: here nothing may ask for it.
+test('#718 AC15: the static sky computes and asks for nothing in the editor, with the moon off or by day', async () => {
+  const at = new Date('2026-10-21T18:00:00Z');
+  const host = fakeHost(MOSCOW);
+  // The editor (#101 View weight 0) and a moon that is not explicitly on compute no phase.
+  assert.equal(moonSkyState(STATIC_ON, false, 0, NIGHT_HASS, at), null);
+  for (const settings of [{ bg_mode: 'static' }, { bg_mode: 'static', moon: false }, { bg_mode: 'static', moon: 'true' }]) {
+    assert.equal(moonSkyState(settings, false, 1, NIGHT_HASS, at), null, JSON.stringify(settings));
+    assert.equal(moonLayer(host, settings, resolveDayCycle(NIGHT_HASS, at), 1), nothing);
+  }
+  // Over "Follow the Sun" the environment carries the moon; the sky computes nothing.
+  assert.equal(moonSkyState({ moon: true, bg_mode: 'daynight' }, true, 1, NIGHT_HASS, at), null);
+  assert.equal(moonLayer(host, STATIC_ON, moonSkyState(STATIC_ON, false, 0, NIGHT_HASS, at), 0), nothing);
+  // By day the chunk is not asked for (#661 C7).
+  const day = moonSkyState(STATIC_ON, false, 1, DAY_HASS, at);
+  assert.equal(day?.phase, 'day');
+  assert.equal(moonLayer(host, STATIC_ON, day, 1), nothing);
+  await new Promise((done) => setTimeout(done, 50));
+  assert.equal(host.updates, 0, 'nothing was loaded');
+});
+
 test('#661 C7: the chunk is asked for at night only; until it arrives there is no moon', async () => {
   const at = new Date('2026-10-21T18:00:00Z');
   const sunAt = (elevation) => resolveDayCycle({ states: { 'sun.sun': { attributes: { azimuth: 0, elevation, rising: false } } } }, at);
@@ -251,3 +377,40 @@ test('#661 C7: the chunk is asked for at night only; until it arrives there is n
   assert.notEqual(element, nothing);
   forgetHost(host);
 });
+
+test('#718 AC15: a static background — global or the space’s own — shows the moon in its sky layer', () => {
+  const at = new Date('2026-10-21T18:00:00Z');
+  const host = fakeHost(MOSCOW);
+  for (const [global, space] of [[STATIC_ON, {}], [{ moon: true, bg_mode: 'daynight' }, { bg_mode: 'static' }]]) {
+    const daynight = bgModeOf(global, space) === 'daynight';
+    assert.equal(daynight, false);
+    const sky = moonSkyState(global, daynight, 1, NIGHT_HASS, at);
+    assert.equal(sky?.phase, 'night');
+    const layer = moonLayer(host, global, sky, 1);
+    assert.notEqual(layer, nothing, JSON.stringify({ global, space }));
+    assert.match(layer.strings[0], /^<div class="hp-moon-sky" aria-hidden="true"/);
+  }
+  // Without `sky` the element goes into the environment, as in #661.
+  const env = moonLayer(host, { moon: true, bg_mode: 'daynight' }, resolveDayCycle(NIGHT_HASS, at));
+  assert.match(env.strings[0], /^<style>/);
+  forgetHost(host);
+});
+
+test('#718 K3/K4: the sky layer is scene-sized, unstacked, and fades with the View weight', () => {
+  const at = new Date('2026-10-21T18:00:00Z');
+  const host = fakeHost(MOSCOW);
+  const sky = renderMoonSky(host, ON, 'night', 0.37, at);
+  const inner = renderMoon(host, ON, 'night', at);
+  const clamped = renderMoonSky(host, ON, 'night', 3, at);
+  forgetHost(host);
+  assert.match(sky.strings[0], /^<div class="hp-moon-sky" aria-hidden="true"\s+style="opacity:$/);
+  assert.equal(sky.values[0], '0.3700');
+  assert.equal(clamped.values[0], '1.0000');
+  // Inside: the very element of the environment, and nothing else.
+  assert.deepEqual(sky.values[1].strings, inner.strings);
+  assert.equal(sky.strings.length, 3);
+  assert.match(sky.strings[2], /^<\/div>$/);
+  const css = inner.values[0];
+  assert.match(css, /\.hp-day-cycle-env,\.hp-moon-sky\{container-type:size\}/);
+  assert.match(css, /\.hp-moon-sky\{position:absolute;inset:0;overflow:hidden;pointer-events:none\}/);
+});
diff --git a/tsconfig.test.json b/tsconfig.test.json
index 75e1e303..ca3175ee 100644
--- a/tsconfig.test.json
+++ b/tsconfig.test.json
@@ -23,7 +23,7 @@
     "src/devices.ts", "src/device-inbox.ts",
     "src/virtual-light-state.ts", "src/config-store.ts", "src/config-reload-authority.ts", "src/config-write-conflict.ts", "src/summary-panel.ts", "src/summary-panel-metrics.ts", "src/summary-panel-i18n.ts", "src/summary-panel-identity.ts", "src/summary-panel-picker.ts", "src/summary-panel-runtime-loaded.ts", "src/header-menu.ts", "src/iso-materials.ts", "src/iso-first-frame.ts", "src/iso-tiles.ts", "src/iso-sun.ts",
     "src/backdrop-probe.ts",
-    "src/types.ts", "src/canvas-constants.ts", "src/editors/dialog-baseline.ts", "src/editors/color-tile-ink.ts", "src/editors/general-form-state.ts", "src/editors/space-form-state.ts", "src/editors/marker-form-state.ts", "src/editors/room-form-state.ts",
+    "src/types.ts", "src/canvas-constants.ts", "src/editors/dialog-baseline.ts", "src/editors/color-tile-ink.ts", "src/editors/general-form-state.ts", "src/editors/moon-status.ts", "src/editors/space-form-state.ts", "src/editors/marker-form-state.ts", "src/editors/room-form-state.ts",
     "src/space-geometry.ts", "src/stairs.ts", "src/clean-floor.ts", "src/stairs-editor-model.ts", "src/stairs-box.ts", "src/stairs-view.ts", "src/junction-limits.ts", "src/room-gear-drag.ts",
     "src/space-order.ts", "src/card-editor-validation.ts",
     "src/signing.ts", "src/initial-load.ts", "src/space-model-selection.ts", "src/space-dialog.ts",