(function () {
  "use strict";

  let overlayEl = null;
  let backdropEl = null;
  let toolbarEl = null;
  let helpButtonEl = null;
  let helpPanelEl = null;
  let compareButtonEl = null;
  let deckCompareButtonEl = null;
  let deckComparePanelEl = null;
  let deckCompareMessageEl = null;
  let deckCompareDeckListEl = null;
  let zoomControlEl = null;
  let zoomSliderEl = null;
  let zoomValueEl = null;
  let opacityControlEl = null;
  let opacitySliderEl = null;
  let opacityValueEl = null;
  let stageEl = null;
  let frameEl = null;
  let baseLayerEl = null;
  let overlayLayerEl = null;
  let compareGridEl = null;
  let imageEl = null;
  let overlayImageEl = null;
  let primaryInfoEl = null;
  let primaryTitleEl = null;
  let primaryGroupsEl = null;
  let primaryHintEl = null;
  let secondaryInfoEl = null;
  let secondaryTitleEl = null;
  let secondaryGroupsEl = null;
  let secondaryHintEl = null;
  let compareGridSlots = [];
  let zoomed = false;
  let previousFocusedEl = null;

  const LIGHTBOX_ZOOM_SCALE = 6.66;
  const LIGHTBOX_ZOOM_STEP = 0.1;
  const LIGHTBOX_PAN_STEP = 4;
  const LIGHTBOX_COMPARE_DEFAULT_OVERLAY_OPACITY = 0.5;
  const LIGHTBOX_COMPARE_SEQUENCE_STEP_KEYS = new Set(["ArrowLeft", "ArrowRight"]);

  const lightboxState = {
    isOpen: false,
    compareMode: false,
    deckCompareMode: false,
    allowOverlayCompare: false,
    allowDeckCompare: false,
    primaryCard: null,
    secondaryCard: null,
    activeDeckId: "",
    activeDeckLabel: "",
    availableCompareDecks: [],
    selectedCompareDeckIds: [],
    deckCompareCards: [],
    maxCompareDecks: 2,
    deckComparePickerOpen: false,
    deckCompareMessage: "",
    sequenceIds: [],
    resolveCardById: null,
    resolveDeckCardById: null,
    onSelectCardId: null,
    overlayOpacity: LIGHTBOX_COMPARE_DEFAULT_OVERLAY_OPACITY,
    zoomScale: LIGHTBOX_ZOOM_SCALE,
    helpOpen: false,
    primaryRotated: false,
    overlayRotated: false,
    zoomOriginX: 50,
    zoomOriginY: 50
  };

  function hasSecondaryCard() {
    return Boolean(lightboxState.secondaryCard?.src);
  }

  function clampOverlayOpacity(value) {
    const numericValue = Number(value);
    if (!Number.isFinite(numericValue)) {
      return LIGHTBOX_COMPARE_DEFAULT_OVERLAY_OPACITY;
    }

    return Math.min(1, Math.max(0.05, numericValue));
  }

  function clampZoomScale(value) {
    const numericValue = Number(value);
    if (!Number.isFinite(numericValue)) {
      return 1;
    }

    return Math.min(LIGHTBOX_ZOOM_SCALE, Math.max(1, numericValue));
  }

  function normalizeCompareDetails(compareDetails) {
    if (!Array.isArray(compareDetails)) {
      return [];
    }

    return compareDetails
      .map((group) => ({
        title: String(group?.title || "").trim(),
        items: Array.isArray(group?.items)
          ? [...new Set(group.items.map((item) => String(item || "").trim()).filter(Boolean))]
          : []
      }))
      .filter((group) => group.title && group.items.length);
  }

  function normalizeOpenRequest(srcOrOptions, altText, extraOptions) {
    if (srcOrOptions && typeof srcOrOptions === "object" && !Array.isArray(srcOrOptions)) {
      return {
        ...srcOrOptions
      };
    }

    return {
      ...(extraOptions || {}),
      src: srcOrOptions,
      altText
    };
  }

  function normalizeCardRequest(request) {
    const normalized = normalizeOpenRequest(request);
    const label = String(normalized.label || normalized.altText || "Tarot card enlarged image").trim() || "Tarot card enlarged image";
    return {
      src: String(normalized.src || "").trim(),
      altText: String(normalized.altText || label).trim() || label,
      label,
      cardId: String(normalized.cardId || "").trim(),
      deckId: String(normalized.deckId || "").trim(),
      deckLabel: String(normalized.deckLabel || normalized.deckId || "").trim(),
      missingReason: String(normalized.missingReason || "").trim(),
      compareDetails: normalizeCompareDetails(normalized.compareDetails)
    };
  }

  function normalizeDeckOptions(deckOptions) {
    if (!Array.isArray(deckOptions)) {
      return [];
    }

    return deckOptions
      .map((deck) => ({
        id: String(deck?.id || "").trim(),
        label: String(deck?.label || deck?.id || "").trim()
      }))
      .filter((deck) => deck.id);
  }

  function getDeckLabel(deckId) {
    const normalizedDeckId = String(deckId || "").trim();
    if (!normalizedDeckId) {
      return "";
    }

    if (normalizedDeckId === lightboxState.activeDeckId && lightboxState.activeDeckLabel) {
      return lightboxState.activeDeckLabel;
    }

    const match = lightboxState.availableCompareDecks.find((deck) => deck.id === normalizedDeckId);
    return match?.label || normalizedDeckId;
  }

  function resolveDeckCardRequest(cardId, deckId) {
    if (!cardId || !deckId || typeof lightboxState.resolveDeckCardById !== "function") {
      return null;
    }

    const resolved = lightboxState.resolveDeckCardById(cardId, deckId);
    if (!resolved) {
      return normalizeCardRequest({
        cardId,
        deckId,
        deckLabel: getDeckLabel(deckId),
        label: lightboxState.primaryCard?.label || "Tarot card",
        altText: lightboxState.primaryCard?.altText || "Tarot card",
        missingReason: "Card image unavailable for this deck."
      });
    }

    return normalizeCardRequest({
      ...resolved,
      cardId,
      deckId,
      deckLabel: resolved.deckLabel || getDeckLabel(deckId)
    });
  }

  function syncDeckCompareCards() {
    if (!lightboxState.deckCompareMode || !lightboxState.primaryCard?.cardId) {
      lightboxState.deckCompareCards = [];
      return;
    }

    lightboxState.deckCompareCards = lightboxState.selectedCompareDeckIds
      .slice(0, lightboxState.maxCompareDecks)
      .map((deckId) => resolveDeckCardRequest(lightboxState.primaryCard.cardId, deckId))
      .filter(Boolean);
  }

  function hasDeckCompareCards() {
    return lightboxState.deckCompareMode && lightboxState.deckCompareCards.length > 0;
  }

  function restoreLightboxFocus() {
    if (!overlayEl || !lightboxState.isOpen) {
      return;
    }

    requestAnimationFrame(() => {
      if (overlayEl && lightboxState.isOpen) {
        overlayEl.focus({ preventScroll: true });
      }
    });
  }

  function resolveCardRequestById(cardId) {
    if (!cardId || typeof lightboxState.resolveCardById !== "function") {
      return null;
    }

    const resolved = lightboxState.resolveCardById(cardId);
    if (!resolved) {
      return null;
    }

    return normalizeCardRequest({
      ...resolved,
      cardId
    });
  }

  function clearSecondaryCard() {
    lightboxState.secondaryCard = null;
    if (overlayImageEl) {
      overlayImageEl.removeAttribute("src");
      overlayImageEl.alt = "";
      overlayImageEl.style.display = "none";
    }

    syncComparePanels();
    syncOpacityControl();
  }

  function clearDeckCompareState() {
    lightboxState.deckCompareMode = false;
    lightboxState.selectedCompareDeckIds = [];
    lightboxState.deckCompareCards = [];
    lightboxState.deckComparePickerOpen = false;
    lightboxState.deckCompareMessage = "";
  }

  function updateDeckCompareMode(deckIds, preservePanel = true) {
    const uniqueDeckIds = [...new Set((Array.isArray(deckIds) ? deckIds : []).map((deckId) => String(deckId || "").trim()).filter(Boolean))]
      .filter((deckId) => deckId !== lightboxState.activeDeckId)
      .slice(0, lightboxState.maxCompareDecks);

    lightboxState.selectedCompareDeckIds = uniqueDeckIds;
    lightboxState.deckCompareMode = uniqueDeckIds.length > 0;
    lightboxState.deckCompareMessage = "";

    if (!lightboxState.deckCompareMode) {
      lightboxState.deckCompareCards = [];
      if (!preservePanel) {
        lightboxState.deckComparePickerOpen = false;
      }
      return;
    }

    lightboxState.compareMode = false;
    clearSecondaryCard();
    syncDeckCompareCards();
  }

  function toggleDeckCompareSelection(deckId) {
    const normalizedDeckId = String(deckId || "").trim();
    if (!normalizedDeckId) {
      return;
    }

    const nextSelection = [...lightboxState.selectedCompareDeckIds];
    const existingIndex = nextSelection.indexOf(normalizedDeckId);
    if (existingIndex >= 0) {
      nextSelection.splice(existingIndex, 1);
      updateDeckCompareMode(nextSelection);
      applyComparePresentation();
      return;
    }

    if (nextSelection.length >= lightboxState.maxCompareDecks) {
      lightboxState.deckCompareMessage = `You can compare up to ${lightboxState.maxCompareDecks} decks at once.`;
      applyComparePresentation();
      return;
    }

    nextSelection.push(normalizedDeckId);
    updateDeckCompareMode(nextSelection);
    applyComparePresentation();
  }

  function toggleDeckComparePanel() {
    if (!lightboxState.allowDeckCompare) {
      lightboxState.deckComparePickerOpen = true;
      lightboxState.deckCompareMessage = "Add another registered deck to use deck compare.";
      applyComparePresentation();
      return;
    }

    lightboxState.deckComparePickerOpen = !lightboxState.deckComparePickerOpen;
    lightboxState.deckCompareMessage = lightboxState.availableCompareDecks.length
      ? ""
      : "Add another registered deck to use deck compare.";
    applyComparePresentation();
  }

  function setOverlayOpacity(value) {
    const opacity = clampOverlayOpacity(value);
    lightboxState.overlayOpacity = opacity;

    if (overlayImageEl) {
      overlayImageEl.style.opacity = String(opacity);
    }

    if (opacitySliderEl) {
      opacitySliderEl.value = String(Math.round(opacity * 100));
      opacitySliderEl.disabled = !lightboxState.compareMode || !hasSecondaryCard();
    }

    if (opacityValueEl) {
      opacityValueEl.textContent = `${Math.round(opacity * 100)}%`;
    }
  }

  function updateImageCursor() {
    const nextCursor = zoomed ? "zoom-out" : "zoom-in";
    if (lightboxState.deckCompareMode) {
      compareGridSlots.forEach((slot) => {
        if (slot?.imageEl) {
          slot.imageEl.style.cursor = nextCursor;
        }
      });
      return;
    }

    if (!imageEl) {
      return;
    }

    imageEl.style.cursor = nextCursor;
  }

  function buildRotationTransform(rotated) {
    return rotated ? "rotate(180deg)" : "rotate(0deg)";
  }

  function isPrimaryRotationActive() {
    return !lightboxState.compareMode && lightboxState.primaryRotated;
  }

  function isOverlayRotationActive() {
    return lightboxState.compareMode && hasSecondaryCard() && lightboxState.overlayRotated;
  }

  function applyTransformOrigins(originX = lightboxState.zoomOriginX, originY = lightboxState.zoomOriginY) {
    const nextOrigin = `${originX}% ${originY}%`;

    if (lightboxState.deckCompareMode) {
      compareGridSlots.forEach((slot) => {
        if (slot?.imageEl) {
          slot.imageEl.style.transformOrigin = nextOrigin;
        }
      });
      return;
    }

    if (baseLayerEl) {
      baseLayerEl.style.transformOrigin = nextOrigin;
    }

    if (overlayLayerEl) {
      overlayLayerEl.style.transformOrigin = nextOrigin;
    }
  }

  function applyZoomTransform() {
    const activeZoomScale = zoomed ? lightboxState.zoomScale : 1;
    const showPrimaryRotation = isPrimaryRotationActive();
    const showOverlayRotation = isOverlayRotationActive();

    if (lightboxState.deckCompareMode) {
      compareGridSlots.forEach((slot) => {
        if (!slot?.imageEl) {
          return;
        }

        slot.imageEl.style.transform = `scale(${activeZoomScale}) ${buildRotationTransform(lightboxState.primaryRotated)}`;
      });

      applyTransformOrigins();
      updateImageCursor();
      return;
    }

    if (baseLayerEl) {
      baseLayerEl.style.transform = `scale(${activeZoomScale})`;
    }

    if (overlayLayerEl) {
      overlayLayerEl.style.transform = `scale(${activeZoomScale})`;
    }

    if (imageEl) {
      imageEl.style.transform = buildRotationTransform(showPrimaryRotation);
    }

    if (overlayImageEl) {
      overlayImageEl.style.transform = buildRotationTransform(showOverlayRotation);
    }

    applyTransformOrigins();

    updateImageCursor();
  }

  function setZoomScale(value) {
    const zoomScale = clampZoomScale(value);
    lightboxState.zoomScale = zoomScale;

    if (zoomSliderEl) {
      zoomSliderEl.value = String(Math.round(zoomScale * 100));
    }

    if (zoomValueEl) {
      zoomValueEl.textContent = `${Math.round(zoomScale * 100)}%`;
    }

    if (lightboxState.isOpen) {
      applyComparePresentation();
      return;
    }

    applyZoomTransform();
  }

  function isZoomInKey(event) {
    return event.key === "+"
      || event.key === "="
      || event.code === "NumpadAdd";
  }

  function isZoomOutKey(event) {
    return event.key === "-"
      || event.key === "_"
      || event.code === "NumpadSubtract";
  }

  function isRotateKey(event) {
    return event.code === "KeyR" || String(event.key || "").toLowerCase() === "r";
  }

  function stepZoom(direction) {
    if (!lightboxState.isOpen) {
      return;
    }

    const activeScale = zoomed ? lightboxState.zoomScale : 1;
    const nextScale = clampZoomScale(activeScale + (direction * LIGHTBOX_ZOOM_STEP));
    zoomed = nextScale > 1;
    setZoomScale(nextScale);

    if (!zoomed && imageEl) {
      lightboxState.zoomOriginX = 50;
      lightboxState.zoomOriginY = 50;
    }

    if (!zoomed && overlayImageEl) {
      lightboxState.zoomOriginX = 50;
      lightboxState.zoomOriginY = 50;
    }
  }

  function isPanUpKey(event) {
    return event.code === "KeyW" || String(event.key || "").toLowerCase() === "w";
  }

  function isPanLeftKey(event) {
    return event.code === "KeyA" || String(event.key || "").toLowerCase() === "a";
  }

  function isPanDownKey(event) {
    return event.code === "KeyS" || String(event.key || "").toLowerCase() === "s";
  }

  function isPanRightKey(event) {
    return event.code === "KeyD" || String(event.key || "").toLowerCase() === "d";
  }

  function stepPan(deltaX, deltaY) {
    if (!lightboxState.isOpen || !zoomed || !imageEl) {
      return;
    }

    lightboxState.zoomOriginX = Math.min(100, Math.max(0, lightboxState.zoomOriginX + deltaX));
    lightboxState.zoomOriginY = Math.min(100, Math.max(0, lightboxState.zoomOriginY + deltaY));
    applyTransformOrigins();
  }

  function toggleRotation() {
    if (!lightboxState.isOpen) {
      return;
    }

    if (lightboxState.deckCompareMode) {
      lightboxState.primaryRotated = !lightboxState.primaryRotated;
      applyZoomTransform();
      return;
    }

    if (lightboxState.compareMode && hasSecondaryCard()) {
      lightboxState.overlayRotated = !lightboxState.overlayRotated;
    } else {
      lightboxState.primaryRotated = !lightboxState.primaryRotated;
    }

    applyZoomTransform();
  }

  function createCompareGroupElement(group) {
    const sectionEl = document.createElement("section");
    sectionEl.style.display = "flex";
    sectionEl.style.flexDirection = "column";
    sectionEl.style.gap = "5px";
    sectionEl.style.paddingTop = "8px";
    sectionEl.style.borderTop = "1px solid rgba(148, 163, 184, 0.14)";

    const titleEl = document.createElement("div");
    titleEl.textContent = group.title;
    titleEl.style.font = "600 10px/1.2 sans-serif";
    titleEl.style.letterSpacing = "0.1em";
    titleEl.style.textTransform = "uppercase";
    titleEl.style.color = "rgba(148, 163, 184, 0.92)";

    const valuesEl = document.createElement("div");
    valuesEl.style.display = "flex";
    valuesEl.style.flexDirection = "column";
    valuesEl.style.gap = "3px";

    group.items.forEach((item) => {
      const itemEl = document.createElement("div");
      itemEl.textContent = item;
      itemEl.style.font = "500 12px/1.35 sans-serif";
      itemEl.style.color = "#f8fafc";
      valuesEl.appendChild(itemEl);
    });

    sectionEl.append(titleEl, valuesEl);
    return sectionEl;
  }

  function renderComparePanel(panelEl, titleEl, groupsEl, hintEl, cardRequest, roleLabel, hintText, isVisible) {
    if (!panelEl || !titleEl || !groupsEl || !hintEl) {
      return;
    }

    if (!isVisible || !cardRequest?.label) {
      panelEl.style.display = "none";
      titleEl.textContent = "";
      hintEl.textContent = "";
      groupsEl.replaceChildren();
      return;
    }

    panelEl.style.display = "flex";
    titleEl.textContent = `${roleLabel}: ${cardRequest.label}`;
    groupsEl.replaceChildren();

    if (Array.isArray(cardRequest.compareDetails) && cardRequest.compareDetails.length) {
      cardRequest.compareDetails.forEach((group) => {
        groupsEl.appendChild(createCompareGroupElement(group));
      });
    } else {
      const emptyEl = document.createElement("div");
      emptyEl.textContent = "No compare metadata available.";
      emptyEl.style.font = "500 12px/1.35 sans-serif";
      emptyEl.style.color = "rgba(226, 232, 240, 0.8)";
      groupsEl.appendChild(emptyEl);
    }

    hintEl.textContent = hintText;
    hintEl.style.display = hintText ? "block" : "none";
  }

  function syncComparePanels() {
    if (lightboxState.deckCompareMode) {
      renderComparePanel(primaryInfoEl, primaryTitleEl, primaryGroupsEl, primaryHintEl, null, "", "", false);
      renderComparePanel(secondaryInfoEl, secondaryTitleEl, secondaryGroupsEl, secondaryHintEl, null, "", "", false);
      return;
    }

    const isComparing = lightboxState.compareMode;
    const overlaySelected = hasSecondaryCard();
    const showPrimaryPanel = Boolean(lightboxState.isOpen && lightboxState.allowOverlayCompare && lightboxState.primaryCard?.label && !zoomed);
    const showSecondaryPanel = Boolean(isComparing && overlaySelected && lightboxState.secondaryCard?.label && !zoomed);

    renderComparePanel(
      primaryInfoEl,
      primaryTitleEl,
      primaryGroupsEl,
      primaryHintEl,
      lightboxState.primaryCard,
      "Base",
      isComparing
        ? (overlaySelected
          ? "Use Left and Right arrows to move through the overlaid card."
          : "Click another House card behind the dock, or use Left and Right arrows to pick the first overlay card.")
        : "Use Left and Right arrows to move through cards. Click Overlay to compare.",
      showPrimaryPanel
    );

    renderComparePanel(
      secondaryInfoEl,
      secondaryTitleEl,
      secondaryGroupsEl,
      secondaryHintEl,
      lightboxState.secondaryCard,
      "Overlay",
      overlaySelected ? "Use Left and Right arrows to swap the overlay card." : "",
      showSecondaryPanel
    );
  }

  function syncOpacityControl() {
    if (!opacityControlEl) {
      return;
    }

    if (lightboxState.deckCompareMode) {
      opacityControlEl.style.display = "none";
      return;
    }

    opacityControlEl.style.display = lightboxState.compareMode && hasSecondaryCard() && !zoomed ? "flex" : "none";
    setOverlayOpacity(lightboxState.overlayOpacity);
  }

  function syncDeckComparePicker() {
    if (!deckCompareButtonEl || !deckComparePanelEl || !deckCompareMessageEl || !deckCompareDeckListEl) {
      return;
    }

    const canShowButton = lightboxState.isOpen && !zoomed && !lightboxState.compareMode;
    deckCompareButtonEl.style.display = canShowButton && (lightboxState.allowDeckCompare || lightboxState.availableCompareDecks.length === 0)
      ? "inline-flex"
      : "none";
    deckCompareButtonEl.textContent = lightboxState.selectedCompareDeckIds.length
      ? `Compare (${lightboxState.selectedCompareDeckIds.length})`
      : "Compare";
    deckCompareButtonEl.setAttribute("aria-pressed", lightboxState.deckComparePickerOpen ? "true" : "false");

    if (!lightboxState.deckComparePickerOpen || zoomed || lightboxState.compareMode) {
      deckComparePanelEl.style.display = "none";
      deckCompareDeckListEl.replaceChildren();
      return;
    }

    deckComparePanelEl.style.display = "flex";
    deckCompareMessageEl.textContent = lightboxState.deckCompareMessage
      || (lightboxState.availableCompareDecks.length
        ? `Choose up to ${lightboxState.maxCompareDecks} extra decks.`
        : "Add another registered deck to use deck compare.");

    deckCompareDeckListEl.replaceChildren();

    if (!lightboxState.availableCompareDecks.length) {
      return;
    }

    lightboxState.availableCompareDecks.forEach((deck) => {
      const isSelected = lightboxState.selectedCompareDeckIds.includes(deck.id);
      const isDisabled = !isSelected && lightboxState.selectedCompareDeckIds.length >= lightboxState.maxCompareDecks;
      const deckButtonEl = document.createElement("button");
      deckButtonEl.type = "button";
      deckButtonEl.textContent = deck.label;
      deckButtonEl.disabled = isDisabled;
      deckButtonEl.setAttribute("aria-pressed", isSelected ? "true" : "false");
      deckButtonEl.style.padding = "10px 12px";
      deckButtonEl.style.borderRadius = "12px";
      deckButtonEl.style.border = isSelected
        ? "1px solid rgba(148, 163, 184, 0.7)"
        : "1px solid rgba(148, 163, 184, 0.22)";
      deckButtonEl.style.background = isSelected ? "rgba(30, 41, 59, 0.92)" : "rgba(15, 23, 42, 0.58)";
      deckButtonEl.style.color = isDisabled ? "rgba(148, 163, 184, 0.52)" : "#f8fafc";
      deckButtonEl.style.cursor = isDisabled ? "not-allowed" : "pointer";
      deckButtonEl.style.font = "600 12px/1.3 sans-serif";
      deckButtonEl.addEventListener("click", () => {
        toggleDeckCompareSelection(deck.id);
        restoreLightboxFocus();
      });
      deckCompareDeckListEl.appendChild(deckButtonEl);
    });

    if (lightboxState.selectedCompareDeckIds.length) {
      const clearButtonEl = document.createElement("button");
      clearButtonEl.type = "button";
      clearButtonEl.textContent = "Clear Compare";
      clearButtonEl.style.marginTop = "4px";
      clearButtonEl.style.padding = "9px 12px";
      clearButtonEl.style.borderRadius = "12px";
      clearButtonEl.style.border = "1px solid rgba(248, 250, 252, 0.16)";
      clearButtonEl.style.background = "rgba(15, 23, 42, 0.44)";
      clearButtonEl.style.color = "rgba(248, 250, 252, 0.92)";
      clearButtonEl.style.cursor = "pointer";
      clearButtonEl.style.font = "600 12px/1.3 sans-serif";
      clearButtonEl.addEventListener("click", () => {
        updateDeckCompareMode([]);
        applyComparePresentation();
        restoreLightboxFocus();
      });
      deckCompareDeckListEl.appendChild(clearButtonEl);
    }
  }

  function renderDeckCompareGrid() {
    if (!compareGridEl || !compareGridSlots.length) {
      return;
    }

    if (!lightboxState.deckCompareMode) {
      compareGridEl.style.display = "none";
      compareGridSlots.forEach((slot) => {
        slot.slotEl.style.display = "none";
        slot.imageEl.removeAttribute("src");
        slot.imageEl.alt = "Tarot compare image";
        slot.imageEl.style.display = "none";
        slot.fallbackEl.style.display = "none";
      });
      return;
    }

    const visibleCards = [lightboxState.primaryCard, ...lightboxState.deckCompareCards].filter(Boolean);
    compareGridEl.style.display = "grid";
    compareGridEl.style.gridTemplateColumns = `repeat(${Math.max(1, visibleCards.length)}, minmax(0, 1fr))`;

    compareGridSlots.forEach((slot, index) => {
      const cardRequest = visibleCards[index] || null;
      if (!cardRequest) {
        slot.slotEl.style.display = "none";
        slot.imageEl.removeAttribute("src");
        slot.imageEl.style.display = "none";
        slot.fallbackEl.style.display = "none";
        return;
      }

      slot.slotEl.style.display = "flex";
      slot.badgeEl.textContent = cardRequest.deckLabel || (index === 0 ? "Active Deck" : "Compare Deck");
      slot.cardLabelEl.textContent = cardRequest.label || "Tarot card";

      if (cardRequest.src) {
        slot.imageEl.src = cardRequest.src;
        slot.imageEl.alt = cardRequest.altText || cardRequest.label || "Tarot compare image";
        slot.imageEl.style.display = "block";
        slot.fallbackEl.style.display = "none";
      } else {
        slot.imageEl.removeAttribute("src");
        slot.imageEl.alt = "";
        slot.imageEl.style.display = "none";
        slot.fallbackEl.textContent = cardRequest.missingReason || "Card image unavailable for this deck.";
        slot.fallbackEl.style.display = "block";
      }
    });

    applyZoomTransform();
  }

  function syncHelpUi() {
    if (!helpButtonEl || !helpPanelEl) {
      return;
    }

    const canShow = lightboxState.isOpen && !zoomed;
    helpButtonEl.style.display = canShow ? "inline-flex" : "none";
    helpPanelEl.style.display = canShow && lightboxState.helpOpen ? "flex" : "none";
    helpButtonEl.textContent = lightboxState.helpOpen ? "Hide Help" : "Help";
  }

  function syncZoomControl() {
    if (!zoomControlEl) {
      return;
    }

    zoomControlEl.style.display = lightboxState.isOpen && !zoomed ? "flex" : "none";
    if (zoomSliderEl) {
      zoomSliderEl.value = String(Math.round(lightboxState.zoomScale * 100));
    }

    if (zoomValueEl) {
      zoomValueEl.textContent = `${Math.round(lightboxState.zoomScale * 100)}%`;
    }
  }

  function applyComparePresentation() {
    if (!overlayEl || !backdropEl || !toolbarEl || !stageEl || !frameEl || !imageEl || !overlayImageEl || !compareButtonEl || !deckCompareButtonEl) {
      return;
    }

    compareButtonEl.hidden = zoomed
      || lightboxState.deckCompareMode
      || !lightboxState.allowOverlayCompare
      || (lightboxState.compareMode && !hasSecondaryCard());
    compareButtonEl.textContent = lightboxState.compareMode ? "Done Overlay" : "Overlay";
    syncHelpUi();
    syncZoomControl();
    syncOpacityControl();
    syncDeckComparePicker();

    if (lightboxState.deckCompareMode) {
      overlayEl.style.pointerEvents = "none";
      backdropEl.style.display = "block";
      backdropEl.style.pointerEvents = "auto";
      backdropEl.style.background = "rgba(0, 0, 0, 0.88)";
      toolbarEl.style.top = "24px";
      toolbarEl.style.right = "24px";
      toolbarEl.style.left = "auto";
      stageEl.style.top = "0";
      stageEl.style.right = "0";
      stageEl.style.bottom = "0";
      stageEl.style.left = "0";
      stageEl.style.width = "auto";
      stageEl.style.height = "auto";
      stageEl.style.transform = "none";
      stageEl.style.pointerEvents = "auto";
      frameEl.style.display = "none";
      primaryInfoEl.style.display = "none";
      secondaryInfoEl.style.display = "none";
      renderDeckCompareGrid();
      return;
    }

    frameEl.style.display = "block";
    compareGridEl.style.display = "none";

    if (!lightboxState.compareMode) {
      overlayEl.style.pointerEvents = "none";
      backdropEl.style.display = "block";
      backdropEl.style.pointerEvents = "auto";
      backdropEl.style.background = "rgba(0, 0, 0, 0.82)";
      toolbarEl.style.top = "24px";
      toolbarEl.style.right = "24px";
      toolbarEl.style.left = "auto";
      stageEl.style.top = "0";
      stageEl.style.right = "0";
      stageEl.style.bottom = "0";
      stageEl.style.left = "0";
      stageEl.style.width = "auto";
      stageEl.style.height = "auto";
      stageEl.style.transform = "none";
      stageEl.style.pointerEvents = "auto";
      frameEl.style.position = "relative";
      frameEl.style.width = "100%";
      frameEl.style.height = "100%";
      frameEl.style.maxWidth = "none";
      frameEl.style.maxHeight = "none";
      frameEl.style.borderRadius = "0";
      frameEl.style.background = "transparent";
      frameEl.style.boxShadow = "none";
      frameEl.style.overflow = "hidden";
      primaryInfoEl.style.left = "auto";
      primaryInfoEl.style.right = "18px";
      primaryInfoEl.style.top = "50%";
      primaryInfoEl.style.bottom = "auto";
      primaryInfoEl.style.width = "clamp(220px, 20vw, 320px)";
      primaryInfoEl.style.transform = "translateY(-50%)";
      imageEl.style.width = "100%";
      imageEl.style.height = "100%";
      imageEl.style.maxWidth = "none";
      imageEl.style.maxHeight = "none";
      imageEl.style.objectFit = "contain";
      overlayImageEl.style.display = "none";
      secondaryInfoEl.style.display = "none";
      syncComparePanels();
      applyZoomTransform();
      return;
    }

    overlayEl.style.pointerEvents = "none";
    backdropEl.style.display = "none";
    backdropEl.style.pointerEvents = "none";
    toolbarEl.style.top = "18px";
    toolbarEl.style.right = "18px";
    toolbarEl.style.left = "auto";
    stageEl.style.pointerEvents = "auto";
    frameEl.style.position = "relative";
    frameEl.style.width = "100%";
    frameEl.style.height = "100%";
    frameEl.style.maxWidth = "none";
    frameEl.style.maxHeight = "none";
    frameEl.style.overflow = "hidden";
    imageEl.style.width = "100%";
    imageEl.style.height = "100%";
    imageEl.style.maxWidth = "none";
    imageEl.style.maxHeight = "none";
    imageEl.style.objectFit = "contain";
    updateImageCursor();

    if (zoomed && hasSecondaryCard()) {
      stageEl.style.top = "0";
      stageEl.style.right = "0";
      stageEl.style.bottom = "0";
      stageEl.style.left = "0";
      stageEl.style.width = "auto";
      stageEl.style.height = "auto";
      stageEl.style.transform = "none";
      frameEl.style.borderRadius = "0";
      frameEl.style.background = "transparent";
      frameEl.style.boxShadow = "none";
    } else if (!hasSecondaryCard()) {
      stageEl.style.top = "auto";
      stageEl.style.right = "18px";
      stageEl.style.bottom = "18px";
      stageEl.style.left = "auto";
      stageEl.style.width = "clamp(180px, 18vw, 280px)";
      stageEl.style.height = "min(44vh, 520px)";
      stageEl.style.transform = "none";
      frameEl.style.borderRadius = "22px";
      frameEl.style.background = "rgba(13, 13, 20, 0.9)";
      frameEl.style.boxShadow = "0 24px 64px rgba(0, 0, 0, 0.5)";
      primaryInfoEl.style.left = "auto";
      primaryInfoEl.style.right = "calc(100% + 16px)";
      primaryInfoEl.style.top = "50%";
      primaryInfoEl.style.bottom = "auto";
      primaryInfoEl.style.width = "clamp(220px, 22vw, 320px)";
      primaryInfoEl.style.transform = "translateY(-50%)";
    } else {
      stageEl.style.top = "50%";
      stageEl.style.right = "auto";
      stageEl.style.bottom = "auto";
      stageEl.style.left = "50%";
      stageEl.style.width = "min(44vw, 560px)";
      stageEl.style.height = "min(92vh, 1400px)";
      stageEl.style.transform = "translate(-50%, -50%)";
      frameEl.style.borderRadius = "28px";
      frameEl.style.background = "rgba(11, 15, 26, 0.88)";
      frameEl.style.boxShadow = "0 30px 90px rgba(0, 0, 0, 0.56)";
      primaryInfoEl.style.left = "auto";
      primaryInfoEl.style.right = "calc(100% + 10px)";
      primaryInfoEl.style.top = "50%";
      primaryInfoEl.style.bottom = "auto";
      primaryInfoEl.style.width = "clamp(180px, 15vw, 220px)";
      primaryInfoEl.style.transform = "translateY(-50%)";
      secondaryInfoEl.style.left = "calc(100% + 10px)";
      secondaryInfoEl.style.right = "auto";
      secondaryInfoEl.style.top = "50%";
      secondaryInfoEl.style.bottom = "auto";
      secondaryInfoEl.style.width = "clamp(180px, 15vw, 220px)";
      secondaryInfoEl.style.transform = "translateY(-50%)";
    }

    if (hasSecondaryCard()) {
      overlayImageEl.style.display = "block";
    } else {
      overlayImageEl.style.display = "none";
      secondaryInfoEl.style.display = "none";
    }

    syncComparePanels();
    applyZoomTransform();
    setOverlayOpacity(lightboxState.overlayOpacity);
  }

  function resetZoom() {
    if (!imageEl && !overlayImageEl) {
      return;
    }

    lightboxState.zoomOriginX = 50;
    lightboxState.zoomOriginY = 50;
    applyTransformOrigins();

    zoomed = false;
    applyZoomTransform();
  }

  function updateZoomOrigin(clientX, clientY, targetImage = imageEl) {
    if (!zoomed || !targetImage) {
      return;
    }

    const rect = targetImage.getBoundingClientRect();
    if (!rect.width || !rect.height) {
      return;
    }

    const x = Math.min(100, Math.max(0, ((clientX - rect.left) / rect.width) * 100));
    const y = Math.min(100, Math.max(0, ((clientY - rect.top) / rect.height) * 100));
    lightboxState.zoomOriginX = x;
    lightboxState.zoomOriginY = y;
    applyTransformOrigins();
  }

  function isPointOnCard(clientX, clientY, targetImage = imageEl) {
    if (!targetImage) {
      return false;
    }

    const rect = targetImage.getBoundingClientRect();
    const naturalWidth = targetImage.naturalWidth;
    const naturalHeight = targetImage.naturalHeight;

    if (!rect.width || !rect.height || !naturalWidth || !naturalHeight) {
      return true;
    }

    const frameAspect = rect.width / rect.height;
    const imageAspect = naturalWidth / naturalHeight;

    let renderWidth = rect.width;
    let renderHeight = rect.height;
    if (imageAspect > frameAspect) {
      renderHeight = rect.width / imageAspect;
    } else {
      renderWidth = rect.height * imageAspect;
    }

    const left = rect.left + (rect.width - renderWidth) / 2;
    const top = rect.top + (rect.height - renderHeight) / 2;
    const right = left + renderWidth;
    const bottom = top + renderHeight;

    return clientX >= left && clientX <= right && clientY >= top && clientY <= bottom;
  }

  function ensure() {
    if (overlayEl && imageEl && overlayImageEl) {
      return;
    }

    overlayEl = document.createElement("div");
    overlayEl.setAttribute("aria-hidden", "true");
    overlayEl.setAttribute("role", "dialog");
    overlayEl.setAttribute("aria-modal", "true");
    overlayEl.tabIndex = -1;
    overlayEl.style.position = "fixed";
    overlayEl.style.inset = "0";
    overlayEl.style.display = "none";
    overlayEl.style.zIndex = "9999";
    overlayEl.style.pointerEvents = "none";

    helpButtonEl = document.createElement("button");
    helpButtonEl.type = "button";
    helpButtonEl.textContent = "Help";
    helpButtonEl.style.position = "fixed";
    helpButtonEl.style.top = "24px";
    helpButtonEl.style.left = "24px";
    helpButtonEl.style.display = "none";
    helpButtonEl.style.alignItems = "center";
    helpButtonEl.style.justifyContent = "center";
    helpButtonEl.style.border = "1px solid rgba(255, 255, 255, 0.2)";
    helpButtonEl.style.background = "rgba(15, 23, 42, 0.84)";
    helpButtonEl.style.color = "#f8fafc";
    helpButtonEl.style.borderRadius = "999px";
    helpButtonEl.style.padding = "10px 14px";
    helpButtonEl.style.font = "600 13px/1.1 sans-serif";
    helpButtonEl.style.cursor = "pointer";
    helpButtonEl.style.backdropFilter = "blur(12px)";
    helpButtonEl.style.pointerEvents = "auto";
    helpButtonEl.style.zIndex = "2";

    helpPanelEl = document.createElement("div");
    helpPanelEl.style.position = "fixed";
    helpPanelEl.style.top = "72px";
    helpPanelEl.style.left = "24px";
    helpPanelEl.style.display = "none";
    helpPanelEl.style.flexDirection = "column";
    helpPanelEl.style.gap = "8px";
    helpPanelEl.style.width = "min(320px, calc(100vw - 48px))";
    helpPanelEl.style.padding = "14px 16px";
    helpPanelEl.style.borderRadius = "18px";
    helpPanelEl.style.background = "rgba(2, 6, 23, 0.88)";
    helpPanelEl.style.border = "1px solid rgba(148, 163, 184, 0.16)";
    helpPanelEl.style.color = "#f8fafc";
    helpPanelEl.style.boxShadow = "0 16px 42px rgba(0, 0, 0, 0.34)";
    helpPanelEl.style.backdropFilter = "blur(12px)";
    helpPanelEl.style.pointerEvents = "auto";
    helpPanelEl.style.zIndex = "2";

    const helpTitleEl = document.createElement("div");
    helpTitleEl.textContent = "Lightbox Shortcuts";
    helpTitleEl.style.font = "700 13px/1.3 sans-serif";

    const helpListEl = document.createElement("div");
    helpListEl.style.display = "flex";
    helpListEl.style.flexDirection = "column";
    helpListEl.style.gap = "6px";
    helpListEl.style.font = "500 12px/1.4 sans-serif";
    helpListEl.style.color = "rgba(226, 232, 240, 0.92)";

    [
      "Click card: toggle zoom at the clicked point",
      "Left / Right: move cards, or move overlay card in compare mode",
      "Overlay: pick a second card to compare",
      "Compare: show the same card from up to two other registered decks",
      "Space: swap base and overlay cards",
      "R: rotate base card, or rotate overlay card in compare mode",
      "+ / -: zoom in or out in steps",
      "W A S D: pan while zoomed",
      "Escape or backdrop click: close"
    ].forEach((line) => {
      const lineEl = document.createElement("div");
      lineEl.textContent = line;
      helpListEl.appendChild(lineEl);
    });

    helpPanelEl.append(helpTitleEl, helpListEl);

    backdropEl = document.createElement("button");
    backdropEl.type = "button";
    backdropEl.setAttribute("aria-label", "Close enlarged tarot card");
    backdropEl.style.position = "absolute";
    backdropEl.style.inset = "0";
    backdropEl.style.border = "none";
    backdropEl.style.padding = "0";
    backdropEl.style.margin = "0";
    backdropEl.style.background = "rgba(0, 0, 0, 0.82)";
    backdropEl.style.cursor = "pointer";

    toolbarEl = document.createElement("div");
    toolbarEl.style.position = "fixed";
    toolbarEl.style.top = "24px";
    toolbarEl.style.right = "24px";
    toolbarEl.style.display = "flex";
    toolbarEl.style.flexDirection = "column";
    toolbarEl.style.alignItems = "flex-end";
    toolbarEl.style.gap = "8px";
    toolbarEl.style.pointerEvents = "auto";
    toolbarEl.style.zIndex = "2";

    compareButtonEl = document.createElement("button");
    compareButtonEl.type = "button";
    compareButtonEl.textContent = "Overlay";
    compareButtonEl.style.border = "1px solid rgba(255, 255, 255, 0.2)";
    compareButtonEl.style.background = "rgba(15, 23, 42, 0.84)";
    compareButtonEl.style.color = "#f8fafc";
    compareButtonEl.style.borderRadius = "999px";
    compareButtonEl.style.padding = "10px 14px";
    compareButtonEl.style.font = "600 13px/1.1 sans-serif";
    compareButtonEl.style.cursor = "pointer";
    compareButtonEl.style.backdropFilter = "blur(12px)";

    deckCompareButtonEl = document.createElement("button");
    deckCompareButtonEl.type = "button";
    deckCompareButtonEl.textContent = "Compare";
    deckCompareButtonEl.style.border = "1px solid rgba(255, 255, 255, 0.2)";
    deckCompareButtonEl.style.background = "rgba(15, 23, 42, 0.84)";
    deckCompareButtonEl.style.color = "#f8fafc";
    deckCompareButtonEl.style.borderRadius = "999px";
    deckCompareButtonEl.style.padding = "10px 14px";
    deckCompareButtonEl.style.font = "600 13px/1.1 sans-serif";
    deckCompareButtonEl.style.cursor = "pointer";
    deckCompareButtonEl.style.backdropFilter = "blur(12px)";

    zoomControlEl = document.createElement("label");
    zoomControlEl.style.display = "flex";
    zoomControlEl.style.alignItems = "center";
    zoomControlEl.style.gap = "8px";
    zoomControlEl.style.padding = "10px 14px";
    zoomControlEl.style.border = "1px solid rgba(255, 255, 255, 0.2)";
    zoomControlEl.style.borderRadius = "999px";
    zoomControlEl.style.background = "rgba(15, 23, 42, 0.84)";
    zoomControlEl.style.color = "#f8fafc";
    zoomControlEl.style.font = "600 12px/1.1 sans-serif";
    zoomControlEl.style.backdropFilter = "blur(12px)";

    const zoomTextEl = document.createElement("span");
    zoomTextEl.textContent = "Zoom";

    zoomSliderEl = document.createElement("input");
    zoomSliderEl.type = "range";
    zoomSliderEl.min = "100";
    zoomSliderEl.max = String(Math.round(LIGHTBOX_ZOOM_SCALE * 100));
    zoomSliderEl.step = "10";
    zoomSliderEl.value = String(Math.round(LIGHTBOX_ZOOM_SCALE * 100));
    zoomSliderEl.style.width = "110px";
    zoomSliderEl.style.cursor = "pointer";

    zoomValueEl = document.createElement("span");
    zoomValueEl.textContent = `${Math.round(LIGHTBOX_ZOOM_SCALE * 100)}%`;
    zoomValueEl.style.minWidth = "42px";
    zoomValueEl.style.textAlign = "right";

    zoomControlEl.append(zoomTextEl, zoomSliderEl, zoomValueEl);

    opacityControlEl = document.createElement("label");
    opacityControlEl.style.display = "none";
    opacityControlEl.style.alignItems = "center";
    opacityControlEl.style.gap = "8px";
    opacityControlEl.style.padding = "10px 14px";
    opacityControlEl.style.border = "1px solid rgba(255, 255, 255, 0.2)";
    opacityControlEl.style.borderRadius = "999px";
    opacityControlEl.style.background = "rgba(15, 23, 42, 0.84)";
    opacityControlEl.style.color = "#f8fafc";
    opacityControlEl.style.font = "600 12px/1.1 sans-serif";
    opacityControlEl.style.backdropFilter = "blur(12px)";

    const opacityTextEl = document.createElement("span");
    opacityTextEl.textContent = "Overlay";

    opacitySliderEl = document.createElement("input");
    opacitySliderEl.type = "range";
    opacitySliderEl.min = "5";
    opacitySliderEl.max = "100";
    opacitySliderEl.step = "5";
    opacitySliderEl.value = String(Math.round(LIGHTBOX_COMPARE_DEFAULT_OVERLAY_OPACITY * 100));
    opacitySliderEl.style.width = "110px";
    opacitySliderEl.style.cursor = "pointer";

    opacityValueEl = document.createElement("span");
    opacityValueEl.textContent = `${Math.round(LIGHTBOX_COMPARE_DEFAULT_OVERLAY_OPACITY * 100)}%`;
    opacityValueEl.style.minWidth = "34px";
    opacityValueEl.style.textAlign = "right";

    opacityControlEl.append(opacityTextEl, opacitySliderEl, opacityValueEl);

    deckComparePanelEl = document.createElement("div");
    deckComparePanelEl.style.position = "fixed";
    deckComparePanelEl.style.top = "24px";
    deckComparePanelEl.style.right = "176px";
    deckComparePanelEl.style.display = "none";
    deckComparePanelEl.style.flexDirection = "column";
    deckComparePanelEl.style.gap = "10px";
    deckComparePanelEl.style.width = "min(280px, calc(100vw - 48px))";
    deckComparePanelEl.style.padding = "14px 16px";
    deckComparePanelEl.style.borderRadius = "18px";
    deckComparePanelEl.style.background = "rgba(2, 6, 23, 0.88)";
    deckComparePanelEl.style.border = "1px solid rgba(148, 163, 184, 0.16)";
    deckComparePanelEl.style.color = "#f8fafc";
    deckComparePanelEl.style.boxShadow = "0 16px 42px rgba(0, 0, 0, 0.34)";
    deckComparePanelEl.style.backdropFilter = "blur(12px)";
    deckComparePanelEl.style.pointerEvents = "auto";
    deckComparePanelEl.style.zIndex = "2";

    const deckCompareTitleEl = document.createElement("div");
    deckCompareTitleEl.textContent = "Compare Registered Decks";
    deckCompareTitleEl.style.font = "700 13px/1.3 sans-serif";

    deckCompareMessageEl = document.createElement("div");
    deckCompareMessageEl.style.font = "500 12px/1.4 sans-serif";
    deckCompareMessageEl.style.color = "rgba(226, 232, 240, 0.84)";

    deckCompareDeckListEl = document.createElement("div");
    deckCompareDeckListEl.style.display = "flex";
    deckCompareDeckListEl.style.flexDirection = "column";
    deckCompareDeckListEl.style.gap = "8px";

    deckComparePanelEl.append(deckCompareTitleEl, deckCompareMessageEl, deckCompareDeckListEl);

    toolbarEl.append(compareButtonEl, deckCompareButtonEl, zoomControlEl, opacityControlEl);

    stageEl = document.createElement("div");
    stageEl.style.position = "fixed";
    stageEl.style.top = "0";
    stageEl.style.right = "0";
    stageEl.style.bottom = "0";
    stageEl.style.left = "0";
    stageEl.style.pointerEvents = "auto";
    stageEl.style.overflow = "visible";
    stageEl.style.transition = "top 220ms ease, right 220ms ease, bottom 220ms ease, left 220ms ease, width 220ms ease, height 220ms ease, transform 220ms ease";
    stageEl.style.transform = "none";
    stageEl.style.zIndex = "1";

    frameEl = document.createElement("div");
    frameEl.style.position = "relative";
    frameEl.style.width = "100%";
    frameEl.style.height = "100%";
    frameEl.style.overflow = "hidden";
    frameEl.style.transition = "border-radius 220ms ease, background 220ms ease, box-shadow 220ms ease";

    baseLayerEl = document.createElement("div");
    baseLayerEl.style.position = "absolute";
    baseLayerEl.style.inset = "0";
    baseLayerEl.style.transform = "scale(1)";
    baseLayerEl.style.transformOrigin = "50% 50%";
    baseLayerEl.style.transition = "transform 120ms ease-out";

    overlayLayerEl = document.createElement("div");
    overlayLayerEl.style.position = "absolute";
    overlayLayerEl.style.inset = "0";
    overlayLayerEl.style.transform = "scale(1)";
    overlayLayerEl.style.transformOrigin = "50% 50%";
    overlayLayerEl.style.transition = "transform 120ms ease-out";
    overlayLayerEl.style.pointerEvents = "none";

    compareGridEl = document.createElement("div");
    compareGridEl.style.position = "absolute";
    compareGridEl.style.inset = "0";
    compareGridEl.style.display = "none";
    compareGridEl.style.gridTemplateColumns = "repeat(1, minmax(0, 1fr))";
    compareGridEl.style.gap = "14px";
    compareGridEl.style.alignItems = "stretch";
    compareGridEl.style.padding = "76px 24px 24px";
    compareGridEl.style.boxSizing = "border-box";

    function createCompareGridSlot() {
      const slotEl = document.createElement("div");
      slotEl.style.display = "none";
      slotEl.style.flexDirection = "column";
      slotEl.style.minWidth = "0";
      slotEl.style.minHeight = "0";
      slotEl.style.borderRadius = "22px";
      slotEl.style.background = "rgba(11, 15, 26, 0.76)";
      slotEl.style.border = "1px solid rgba(148, 163, 184, 0.12)";
      slotEl.style.boxShadow = "0 24px 64px rgba(0, 0, 0, 0.36)";
      slotEl.style.overflow = "hidden";

      const headerEl = document.createElement("div");
      headerEl.style.display = "flex";
      headerEl.style.alignItems = "center";
      headerEl.style.justifyContent = "space-between";
      headerEl.style.gap = "10px";
      headerEl.style.padding = "10px 12px";
      headerEl.style.background = "rgba(15, 23, 42, 0.72)";
      headerEl.style.borderBottom = "1px solid rgba(148, 163, 184, 0.1)";

      const badgeEl = document.createElement("span");
      badgeEl.style.font = "700 11px/1.2 sans-serif";
      badgeEl.style.letterSpacing = "0.08em";
      badgeEl.style.textTransform = "uppercase";
      badgeEl.style.color = "#f8fafc";

      const cardLabelEl = document.createElement("span");
      cardLabelEl.style.font = "500 11px/1.3 sans-serif";
      cardLabelEl.style.color = "rgba(226, 232, 240, 0.84)";
      cardLabelEl.style.textAlign = "right";
      cardLabelEl.style.whiteSpace = "nowrap";
      cardLabelEl.style.overflow = "hidden";
      cardLabelEl.style.textOverflow = "ellipsis";

      headerEl.append(badgeEl, cardLabelEl);

      const mediaEl = document.createElement("div");
      mediaEl.style.position = "relative";
      mediaEl.style.flex = "1 1 auto";
      mediaEl.style.minHeight = "0";
      mediaEl.style.display = "flex";
      mediaEl.style.alignItems = "center";
      mediaEl.style.justifyContent = "center";
      mediaEl.style.padding = "16px";
      mediaEl.style.background = "rgba(2, 6, 23, 0.4)";
      mediaEl.style.overflow = "hidden";

      const compareImageEl = document.createElement("img");
      compareImageEl.alt = "Tarot compare image";
      compareImageEl.style.width = "100%";
      compareImageEl.style.height = "100%";
      compareImageEl.style.objectFit = "contain";
      compareImageEl.style.cursor = "zoom-in";
      compareImageEl.style.transform = "scale(1) rotate(0deg)";
      compareImageEl.style.transformOrigin = "center center";
      compareImageEl.style.transition = "transform 120ms ease-out";
      compareImageEl.style.userSelect = "none";

      const fallbackEl = document.createElement("div");
      fallbackEl.style.display = "none";
      fallbackEl.style.maxWidth = "260px";
      fallbackEl.style.padding = "16px";
      fallbackEl.style.textAlign = "center";
      fallbackEl.style.font = "600 13px/1.45 sans-serif";
      fallbackEl.style.color = "rgba(226, 232, 240, 0.88)";

      mediaEl.append(compareImageEl, fallbackEl);
      slotEl.append(headerEl, mediaEl);

      return {
        slotEl,
        badgeEl,
        cardLabelEl,
        imageEl: compareImageEl,
        fallbackEl
      };
    }

    compareGridSlots = [createCompareGridSlot(), createCompareGridSlot(), createCompareGridSlot()];
    compareGridSlots.forEach((slot) => {
      compareGridEl.appendChild(slot.slotEl);
    });

    imageEl = document.createElement("img");
    imageEl.alt = "Tarot card enlarged image";
    imageEl.style.width = "100%";
    imageEl.style.height = "100%";
    imageEl.style.objectFit = "contain";
    imageEl.style.cursor = "zoom-in";
    imageEl.style.transform = "rotate(0deg)";
    imageEl.style.transformOrigin = "center center";
    imageEl.style.transition = "transform 120ms ease-out, opacity 180ms ease";
    imageEl.style.userSelect = "none";

    overlayImageEl = document.createElement("img");
    overlayImageEl.alt = "Tarot card overlay image";
    overlayImageEl.style.width = "100%";
    overlayImageEl.style.height = "100%";
    overlayImageEl.style.objectFit = "contain";
    overlayImageEl.style.opacity = String(LIGHTBOX_COMPARE_DEFAULT_OVERLAY_OPACITY);
    overlayImageEl.style.pointerEvents = "none";
    overlayImageEl.style.display = "none";
    overlayImageEl.style.transform = "rotate(0deg)";
    overlayImageEl.style.transformOrigin = "center center";
    overlayImageEl.style.transition = "opacity 180ms ease";

    function createInfoPanel() {
      const panelEl = document.createElement("div");
      panelEl.style.position = "absolute";
      panelEl.style.display = "none";
      panelEl.style.flexDirection = "column";
      panelEl.style.gap = "10px";
      panelEl.style.padding = "14px 16px";
      panelEl.style.borderRadius = "18px";
      panelEl.style.background = "rgba(2, 6, 23, 0.8)";
      panelEl.style.border = "1px solid rgba(148, 163, 184, 0.16)";
      panelEl.style.color = "#f8fafc";
      panelEl.style.backdropFilter = "blur(12px)";
      panelEl.style.boxShadow = "0 16px 42px rgba(0, 0, 0, 0.34)";
      panelEl.style.transition = "opacity 180ms ease, transform 180ms ease";
      panelEl.style.transform = "translateY(-50%)";
      panelEl.style.pointerEvents = "none";
      panelEl.style.maxHeight = "min(78vh, 760px)";
      panelEl.style.overflowY = "auto";

      const titleEl = document.createElement("div");
      titleEl.style.font = "700 13px/1.3 sans-serif";
      titleEl.style.color = "#f8fafc";

      const groupsEl = document.createElement("div");
      groupsEl.style.display = "flex";
      groupsEl.style.flexDirection = "column";
      groupsEl.style.gap = "0";

      const hintEl = document.createElement("div");
      hintEl.style.font = "500 11px/1.35 sans-serif";
      hintEl.style.color = "rgba(226, 232, 240, 0.82)";

      panelEl.append(titleEl, groupsEl, hintEl);
      return { panelEl, titleEl, groupsEl, hintEl };
    }

    const primaryPanel = createInfoPanel();
    primaryInfoEl = primaryPanel.panelEl;
    primaryTitleEl = primaryPanel.titleEl;
    primaryGroupsEl = primaryPanel.groupsEl;
    primaryHintEl = primaryPanel.hintEl;

    const secondaryPanel = createInfoPanel();
    secondaryInfoEl = secondaryPanel.panelEl;
    secondaryTitleEl = secondaryPanel.titleEl;
    secondaryGroupsEl = secondaryPanel.groupsEl;
    secondaryHintEl = secondaryPanel.hintEl;
    baseLayerEl.appendChild(imageEl);
    overlayLayerEl.appendChild(overlayImageEl);
    frameEl.append(baseLayerEl, overlayLayerEl);
    stageEl.append(frameEl, compareGridEl, primaryInfoEl, secondaryInfoEl);
    overlayEl.append(backdropEl, stageEl, toolbarEl, deckComparePanelEl, helpButtonEl, helpPanelEl);

    const close = () => {
      if (!overlayEl || !imageEl || !overlayImageEl) {
        return;
      }

      lightboxState.isOpen = false;
      lightboxState.compareMode = false;
      lightboxState.deckCompareMode = false;
      lightboxState.allowOverlayCompare = false;
      lightboxState.allowDeckCompare = false;
      lightboxState.primaryCard = null;
      lightboxState.secondaryCard = null;
      lightboxState.activeDeckId = "";
      lightboxState.activeDeckLabel = "";
      lightboxState.availableCompareDecks = [];
      lightboxState.selectedCompareDeckIds = [];
      lightboxState.deckCompareCards = [];
      lightboxState.maxCompareDecks = 2;
      lightboxState.deckComparePickerOpen = false;
      lightboxState.deckCompareMessage = "";
      lightboxState.sequenceIds = [];
      lightboxState.resolveCardById = null;
      lightboxState.resolveDeckCardById = null;
      lightboxState.onSelectCardId = null;
      lightboxState.overlayOpacity = LIGHTBOX_COMPARE_DEFAULT_OVERLAY_OPACITY;
      lightboxState.zoomScale = LIGHTBOX_ZOOM_SCALE;
      lightboxState.helpOpen = false;
      lightboxState.primaryRotated = false;
      lightboxState.overlayRotated = false;
      overlayEl.style.display = "none";
      overlayEl.setAttribute("aria-hidden", "true");
      imageEl.removeAttribute("src");
      imageEl.alt = "Tarot card enlarged image";
      overlayImageEl.removeAttribute("src");
      overlayImageEl.alt = "";
      overlayImageEl.style.display = "none";
      resetZoom();
      syncHelpUi();
      syncComparePanels();
      syncOpacityControl();
      syncDeckComparePicker();
      renderDeckCompareGrid();

      if (previousFocusedEl instanceof HTMLElement) {
        previousFocusedEl.focus({ preventScroll: true });
      }
      previousFocusedEl = null;
    };

    function toggleCompareMode() {
      if (!lightboxState.allowOverlayCompare || !lightboxState.primaryCard) {
        return;
      }

      lightboxState.compareMode = !lightboxState.compareMode;
      if (!lightboxState.compareMode) {
        clearSecondaryCard();
      }
      applyComparePresentation();
    }

    function setSecondaryCard(cardRequest, syncSelection = false) {
      const normalizedCard = normalizeCardRequest(cardRequest);
      if (!normalizedCard.src || !normalizedCard.cardId || normalizedCard.cardId === lightboxState.primaryCard?.cardId) {
        return false;
      }

      lightboxState.secondaryCard = normalizedCard;
      overlayImageEl.src = normalizedCard.src;
      overlayImageEl.alt = normalizedCard.altText;
      overlayImageEl.style.display = "block";
      overlayImageEl.style.opacity = String(lightboxState.overlayOpacity);
      if (syncSelection && typeof lightboxState.onSelectCardId === "function") {
        lightboxState.onSelectCardId(normalizedCard.cardId);
      }
      applyComparePresentation();
      return true;
    }

    function stepSecondaryCard(direction) {
      const sequence = Array.isArray(lightboxState.sequenceIds) ? lightboxState.sequenceIds : [];
      if (!lightboxState.compareMode || sequence.length < 2 || typeof lightboxState.resolveCardById !== "function") {
        return;
      }

      const anchorId = lightboxState.secondaryCard?.cardId || lightboxState.primaryCard?.cardId;
      const startIndex = sequence.indexOf(anchorId);
      if (startIndex < 0) {
        return;
      }

      for (let offset = 1; offset <= sequence.length; offset += 1) {
        const nextIndex = (startIndex + direction * offset + sequence.length) % sequence.length;
        const nextCardId = sequence[nextIndex];
        if (!nextCardId || nextCardId === lightboxState.primaryCard?.cardId) {
          continue;
        }

        const nextCard = resolveCardRequestById(nextCardId);
        if (nextCard && setSecondaryCard(nextCard, true)) {
          break;
        }
      }
    }

    function stepPrimaryCard(direction) {
      const sequence = Array.isArray(lightboxState.sequenceIds) ? lightboxState.sequenceIds : [];
      if (lightboxState.compareMode || sequence.length < 2 || typeof lightboxState.resolveCardById !== "function") {
        return;
      }

      const startIndex = sequence.indexOf(lightboxState.primaryCard?.cardId);
      if (startIndex < 0) {
        return;
      }

      const nextIndex = (startIndex + direction + sequence.length) % sequence.length;
      const nextCardId = sequence[nextIndex];
      const nextCard = resolveCardRequestById(nextCardId);
      if (!nextCard?.src) {
        return;
      }

      lightboxState.primaryCard = nextCard;
      imageEl.src = nextCard.src;
      imageEl.alt = nextCard.altText;
      resetZoom();
      if (lightboxState.deckCompareMode) {
        syncDeckCompareCards();
      } else {
        clearSecondaryCard();
      }
      if (typeof lightboxState.onSelectCardId === "function") {
        lightboxState.onSelectCardId(nextCard.cardId);
      }
      applyComparePresentation();
    }

    function swapCompareCards() {
      if (!lightboxState.compareMode || !lightboxState.primaryCard?.src || !lightboxState.secondaryCard?.src) {
        return;
      }

      const nextPrimaryCard = lightboxState.secondaryCard;
      const nextSecondaryCard = lightboxState.primaryCard;

      lightboxState.primaryCard = nextPrimaryCard;
      lightboxState.secondaryCard = nextSecondaryCard;

      imageEl.src = nextPrimaryCard.src;
      imageEl.alt = nextPrimaryCard.altText;
      overlayImageEl.src = nextSecondaryCard.src;
      overlayImageEl.alt = nextSecondaryCard.altText;
      overlayImageEl.style.display = "block";
      overlayImageEl.style.opacity = String(lightboxState.overlayOpacity);

      if (typeof lightboxState.onSelectCardId === "function") {
        lightboxState.onSelectCardId(nextPrimaryCard.cardId);
      }

      applyComparePresentation();
    }

    function shouldIgnoreGlobalKeydown(event) {
      const target = event.target;
      if (!(target instanceof HTMLElement)) {
        return false;
      }

      if (!overlayEl?.contains(target)) {
        return false;
      }

      return target instanceof HTMLInputElement
        || target instanceof HTMLTextAreaElement
        || target instanceof HTMLSelectElement
        || target instanceof HTMLButtonElement;
    }

    function restoreLightboxFocus() {
      if (!overlayEl || !lightboxState.isOpen) {
        return;
      }

      requestAnimationFrame(() => {
        if (overlayEl && lightboxState.isOpen) {
          overlayEl.focus({ preventScroll: true });
        }
      });
    }

    backdropEl.addEventListener("click", close);
    helpButtonEl.addEventListener("click", () => {
      lightboxState.helpOpen = !lightboxState.helpOpen;
      syncHelpUi();
      restoreLightboxFocus();
    });
    compareButtonEl.addEventListener("click", () => {
      toggleCompareMode();
      restoreLightboxFocus();
    });
    deckCompareButtonEl.addEventListener("click", () => {
      toggleDeckComparePanel();
      restoreLightboxFocus();
    });
    zoomSliderEl.addEventListener("input", () => {
      setZoomScale(Number(zoomSliderEl.value) / 100);
    });
    zoomSliderEl.addEventListener("change", restoreLightboxFocus);
    zoomSliderEl.addEventListener("pointerup", restoreLightboxFocus);
    opacitySliderEl.addEventListener("input", () => {
      setOverlayOpacity(Number(opacitySliderEl.value) / 100);
    });
    opacitySliderEl.addEventListener("change", restoreLightboxFocus);
    opacitySliderEl.addEventListener("pointerup", restoreLightboxFocus);

    imageEl.addEventListener("click", (event) => {
      event.stopPropagation();
      if (!isPointOnCard(event.clientX, event.clientY)) {
        if (lightboxState.compareMode) {
          return;
        }

        close();
        return;
      }

      if (!zoomed) {
        zoomed = true;
        applyZoomTransform();
        updateZoomOrigin(event.clientX, event.clientY);
        applyComparePresentation();
        return;
      }

      resetZoom();
      applyComparePresentation();
    });

    imageEl.addEventListener("mousemove", (event) => {
      updateZoomOrigin(event.clientX, event.clientY);
    });

    imageEl.addEventListener("mouseleave", () => {
      if (zoomed) {
        lightboxState.zoomOriginX = 50;
        lightboxState.zoomOriginY = 50;
        applyTransformOrigins();
      }
    });

    compareGridSlots.forEach((slot) => {
      slot.imageEl.addEventListener("click", (event) => {
        event.stopPropagation();
        if (!isPointOnCard(event.clientX, event.clientY, slot.imageEl)) {
          close();
          return;
        }

        if (!zoomed) {
          zoomed = true;
          applyZoomTransform();
          updateZoomOrigin(event.clientX, event.clientY, slot.imageEl);
          applyComparePresentation();
          return;
        }

        resetZoom();
        applyComparePresentation();
      });

      slot.imageEl.addEventListener("mousemove", (event) => {
        updateZoomOrigin(event.clientX, event.clientY, slot.imageEl);
      });

      slot.imageEl.addEventListener("mouseleave", () => {
        if (zoomed) {
          lightboxState.zoomOriginX = 50;
          lightboxState.zoomOriginY = 50;
          applyTransformOrigins();
        }
      });
    });

    document.addEventListener("keydown", (event) => {
      if (event.key === "Escape") {
        close();
        return;
      }

      if (shouldIgnoreGlobalKeydown(event)) {
        return;
      }

      if (lightboxState.isOpen && event.code === "Space" && lightboxState.compareMode && hasSecondaryCard()) {
        event.preventDefault();
        swapCompareCards();
        return;
      }

      if (lightboxState.isOpen && isRotateKey(event)) {
        event.preventDefault();
        toggleRotation();
        return;
      }

      if (lightboxState.isOpen && isZoomInKey(event)) {
        event.preventDefault();
        stepZoom(1);
        return;
      }

      if (lightboxState.isOpen && isZoomOutKey(event)) {
        event.preventDefault();
        stepZoom(-1);
        return;
      }

      if (lightboxState.isOpen && zoomed && isPanUpKey(event)) {
        event.preventDefault();
        stepPan(0, -LIGHTBOX_PAN_STEP);
        return;
      }

      if (lightboxState.isOpen && zoomed && isPanLeftKey(event)) {
        event.preventDefault();
        stepPan(-LIGHTBOX_PAN_STEP, 0);
        return;
      }

      if (lightboxState.isOpen && zoomed && isPanDownKey(event)) {
        event.preventDefault();
        stepPan(0, LIGHTBOX_PAN_STEP);
        return;
      }

      if (lightboxState.isOpen && zoomed && isPanRightKey(event)) {
        event.preventDefault();
        stepPan(LIGHTBOX_PAN_STEP, 0);
        return;
      }

      if (!lightboxState.isOpen || !LIGHTBOX_COMPARE_SEQUENCE_STEP_KEYS.has(event.key)) {
        return;
      }

      event.preventDefault();
      if (lightboxState.compareMode) {
        stepSecondaryCard(event.key === "ArrowRight" ? 1 : -1);
        return;
      }

      stepPrimaryCard(event.key === "ArrowRight" ? 1 : -1);
    });

    document.body.appendChild(overlayEl);

    overlayEl.closeLightbox = close;
    overlayEl.setSecondaryCard = setSecondaryCard;
    overlayEl.applyComparePresentation = applyComparePresentation;
  }

  function open(srcOrOptions, altText, extraOptions) {
    const request = normalizeOpenRequest(srcOrOptions, altText, extraOptions);
    const normalizedPrimary = normalizeCardRequest(request);

    if (!normalizedPrimary.src) {
      return;
    }

    ensure();
    if (!overlayEl || !imageEl || !overlayImageEl) {
      return;
    }

    const canCompare = Boolean(
      request.allowOverlayCompare
      && normalizedPrimary.cardId
      && Array.isArray(request.sequenceIds)
      && request.sequenceIds.length > 1
      && typeof request.resolveCardById === "function"
    );
    const canDeckCompare = Boolean(
      request.allowDeckCompare
      && normalizedPrimary.cardId
      && typeof request.resolveDeckCardById === "function"
    );

    if (lightboxState.isOpen && lightboxState.compareMode && lightboxState.allowOverlayCompare && canCompare && normalizedPrimary.cardId) {
      if (normalizedPrimary.cardId === lightboxState.primaryCard?.cardId) {
        return;
      }
      overlayEl.setSecondaryCard?.(normalizedPrimary, false);
      return;
    }

    lightboxState.isOpen = true;
    lightboxState.compareMode = false;
    lightboxState.deckCompareMode = false;
    lightboxState.allowOverlayCompare = canCompare;
    lightboxState.allowDeckCompare = canDeckCompare;
    lightboxState.primaryCard = normalizedPrimary;
    lightboxState.activeDeckId = String(request.activeDeckId || normalizedPrimary.deckId || "").trim();
    lightboxState.activeDeckLabel = String(request.activeDeckLabel || normalizedPrimary.deckLabel || lightboxState.activeDeckId).trim();
    lightboxState.availableCompareDecks = canDeckCompare
      ? normalizeDeckOptions(request.availableCompareDecks).filter((deck) => deck.id !== lightboxState.activeDeckId)
      : [];
    lightboxState.selectedCompareDeckIds = [];
    lightboxState.deckCompareCards = [];
    lightboxState.maxCompareDecks = Number.isInteger(Number(request.maxCompareDecks)) && Number(request.maxCompareDecks) > 0
      ? Number(request.maxCompareDecks)
      : 2;
    lightboxState.deckComparePickerOpen = false;
    lightboxState.deckCompareMessage = "";
    lightboxState.sequenceIds = canCompare ? [...request.sequenceIds] : [];
    lightboxState.resolveCardById = canCompare ? request.resolveCardById : null;
    lightboxState.resolveDeckCardById = canDeckCompare ? request.resolveDeckCardById : null;
    lightboxState.onSelectCardId = canCompare && typeof request.onSelectCardId === "function"
      ? request.onSelectCardId
      : null;
    lightboxState.overlayOpacity = LIGHTBOX_COMPARE_DEFAULT_OVERLAY_OPACITY;
    lightboxState.zoomScale = LIGHTBOX_ZOOM_SCALE;
    lightboxState.helpOpen = false;
    lightboxState.primaryRotated = false;
    lightboxState.overlayRotated = false;

    imageEl.src = normalizedPrimary.src;
    imageEl.alt = normalizedPrimary.altText;
    clearSecondaryCard();
    resetZoom();
    previousFocusedEl = document.activeElement instanceof HTMLElement ? document.activeElement : null;
    overlayEl.style.display = "block";
    overlayEl.setAttribute("aria-hidden", "false");
    overlayEl.applyComparePresentation?.();
    overlayEl.focus({ preventScroll: true });
  }

  window.TarotUiLightbox = {
    ...(window.TarotUiLightbox || {}),
    open
  };
})();