/**
 * SlideCanvas ??Phase Z ?ㅼ젣 寃곌낵 (final.html) iframe ?쒖떆.
 *
 * ??븷 (Phase 1 ??MDX upload ???뚯씠?꾨씪???ㅽ뻾 ??寃곌낵 ?쒖떆):
 *   - MDX ?낅줈????server 媛€ Phase Z ?ㅽ뻾
 *   - run_id ??final.html ??iframe ?쇰줈 ?쒖떆
 *   - ?쒕??덉씠??/ mock ?щ씪?대뱶 layout ?뚮뜑 X
 *
 * ?댁쟾 simulation (FocusSplitLayout / QuadrantGridLayout / DEFAULT_GEOMETRIES /
 * Phase Z Engine header / Summary footer) 紐⑤몢 ?쒓굅 ??frontend 媛€ ?щ씪?대뱶瑜?*留뚮뱾吏€ ?딆쓬*,
 * backend 寃곌낵瑜?*?쎄린留???.
 *
 * Layout / zone / region / frame 蹂€寃?UI ??醫뚯슦 ?⑤꼸 (LayoutPanel / FramePanel)
 * ?먯꽌 ?섑뻾. 蹂?而댄룷?뚰듃??*寃곌낵 viewer*.
 */

import { useRef, useEffect, useState } from "react";
import { Loader2, Upload as UploadIcon } from "lucide-react";
import type {
  SlidePlan,
  UserSelection,
  NormalizedContent,
} from "../types/designAgent";
import {
  IMAGE_RESIZE_MIN_SIZE_PERCENT,
  clampImagePercentGeometry,
  clampZoneMove,
  crossedDragThreshold,
  type ImageDragDirection,
} from "./slideCanvasDragMath";
import type {
  ImageOverridesOverride,
  StructureOverridesOverride,
  StructureOverridePerZone,
} from "../services/userOverridesApi";
import StructureEditOverlay from "./StructureEditOverlay";

interface SlideCanvasProps {
  slidePlan: SlidePlan | null;
  normalizedContent: NormalizedContent | null;
  userSelection: UserSelection;
  /** Phase Z 媛€ 留뚮뱺 final.html URL (iframe ?쇰줈 ?쒖떆). */
  finalHtmlUrl?: string;
  /** ?뚯씠?꾨씪???ㅽ뻾 以??쒖떆 (loading state). */
  isPipelineRunning?: boolean;
  /** Phase 2 : pending layout 紐⑤뱶 ??final.html iframe ?④린怨?鍮?layout zone 留??쒖떆. */
  isPendingLayout?: boolean;
  pendingLayoutId?: string | null;
  onCancelPendingLayout?: () => void;
  /** ?몄쭛 紐⑤뱶 ?띿뒪??蹂€寃?諛쒖깮 ????Home.tsx 媛€ hasPendingChanges ?몃━嫄? */
  onContentEdit?: () => void;
  /** Zone overlay ?대┃ ???곗륫 Frame ??쑝濡??꾪솚 + 洹?zone ??frame ?꾨낫 ?쒖떆. */
  onZoneClick?: (zoneId: string) => void;
  /** ?щ씪?대뱶 諛뺤뒪 (zone overlay ??鍮??곸뿭) ?대┃ ???곗륫 Layout ??쑝濡??꾪솚. */
  onSlideClick?: () => void;
  onRegionClick?: (regionId: string) => void;
  onFrameSelect?: (frameId: string) => void;
  onSectionDrop?: (sectionId: string, zoneId: string) => void;
  onLayoutResize?: (groupId: string, sizes: number[]) => void;
  onZoneResize?: (
    geometries: Record<string, { x: number; y: number; w: number; h: number }>
  ) => void;
  /** IMP-51 (#79) u8 ??persisted slide-absolute image geometries
   *  (image_id ??{x,y,w,h} as percent of 1280횞720, range 0??00). Mirrors
   *  the u3 typed-client `ImageOverride` contract and the u7 stamper that
   *  emits CSS `left/top/width/height: {value}%`. Forward-compat optional;
   *  u11 wires this from `userSelection.overrides.image_overrides`. When
   *  present, SlideCanvas displays the persisted geometry instead of the
   *  iframe-measured baseline. */
  imageOverrides?: ImageOverridesOverride;
  /** IMP-51 (#79) u8 ??emitted when the user drags or resizes a stamped
   *  user-content image. Geometry is slide-absolute percent (0??00 of
   *  1280횞720), matching the persisted axis schema (u3 typed client) and
   *  the u7 CSS injection that writes the values directly into
   *  `left/top/width/height: {value}%`. u10 wires this to a persistence
   *  handler that updates `image_overrides` on user_overrides.json. */
  onImageResize?: (
    imageId: string,
    geometry: { x: number; y: number; w: number; h: number }
  ) => void;
  /** IMP-90 (#90) u13 ??focusout-emitted capture; u15 debounces + PUTs. */
  onTextEdit?: (capture: TextEditCapture) => void;
  /** IMP-90 (#90) u14 ??persisted structure overrides per zone
   *  (slot_order + hidden_slots). When `editMode === "structure"` the
   *  StructureEditOverlay reads from this to render the current state. */
  structureOverrides?: StructureOverridesOverride;
  /** IMP-90 (#90) u14 ??emitted whenever the user reorders or hides a
   *  slot in structure-mode. u15 will debounce + PUT to /api/user-
   *  overrides; u14 only exposes the capture. SCOPE LOCK: inner shape is
   *  `{slot_order, hidden_slots}` only (frame swap stays on `frames` axis). */
  onStructureEdit?: (zoneId: string, capture: StructureOverridePerZone) => void;
}

const SLIDE_W = 1280;
const SLIDE_H = 720;

// IMP-90 (#90) u11 ??discriminated edit mode. Replaces the prior single
// `isEditMode` boolean. u11 introduces the enum + the toolbar UI surface;
// gesture gating (text contentEditable vs structure reorder vs image-zone
// drag/resize) stays unified behind `isEditMode = editMode !== 'off'` so
// existing behavior is preserved byte-identical. u12 will discriminate the
// gestures per mode (mutually exclusive). The 'off' state is the no-edit
// baseline; 'image-zone' bundles image edit (#79) + zone resize (#81)
// because both are pointer-driven canvas gestures on slide geometry.
export type EditMode = "off" | "text" | "structure" | "image-zone";
export const EDIT_MODES: ReadonlyArray<EditMode> = ["text", "structure", "image-zone"];
/** Pure helper ??given the current edit mode and the user's requested mode,
 *  return the next mode. Clicking the active mode toggles back to 'off';
 *  clicking a different mode switches; explicit 'off' always exits. */
export function nextEditMode(current: EditMode, requested: EditMode): EditMode {
  if (requested === "off") return "off";
  return current === requested ? "off" : requested;
}

// IMP-90 (#90) u12 ??per-mode gesture gating. Pure helper deriving the
// boolean gates that drive SlideCanvas's useEffect branches (designMode
// + iframe-side image click listener) and JSX conditionals (iframe
// pointer-events, zone resize/drag affordances, image overlay). The
// mapping enforces the mutually-exclusive contract from the issue body:
//   text       -> contentEditable + iframe pointer-events:auto only.
//   structure  -> nothing here; u14 will plant the structure overlay.
//   image-zone -> zone resize/drag + image overlay; iframe pe:auto so
//                 in-iframe user-content images can be click-selected.
//   off        -> every gate false (baseline).
// pendingLayout fully suppresses every gate ??mirrors the existing
// useEffect (line ~248) that forces editMode='off' on pendingLayout
// entry. The helper still defensively returns all-false so a stray
// pendingLayout=true with a non-'off' editMode never leaks gestures.
export interface EditModeGates {
  textEditing: boolean;
  imageSelection: boolean;
  iframePointerAuto: boolean;
  zoneGestures: boolean;
  imageOverlay: boolean;
}
export function computeEditModeGates(
  editMode: EditMode,
  isPendingLayout: boolean
): EditModeGates {
  if (isPendingLayout) {
    return {
      textEditing: false,
      imageSelection: false,
      iframePointerAuto: false,
      zoneGestures: false,
      imageOverlay: false,
    };
  }
  return {
    textEditing: editMode === "text",
    imageSelection: editMode === "image-zone",
    iframePointerAuto: editMode === "text" || editMode === "image-zone",
    zoneGestures: editMode === "image-zone",
    imageOverlay: editMode === "image-zone",
  };
}

// IMP-90 (#90) u13 ??pure helper resolving a contentEditable focusout
// target into (zoneId, textPath, value). data-text-path stamped by u8 at
// Step 13; .zone[data-zone-position] from Phase Z slide-base. Non-stamped
// targets return null so capture silently skips. u15 will debounce + PUT.
export interface TextEditCaptureTarget {
  closest(selector: string): TextEditCaptureTarget | null;
  getAttribute(name: string): string | null;
  textContent: string | null;
}
export interface TextEditCapture {
  zoneId: string;
  textPath: string;
  value: string;
}
export function deriveTextEditCapture(
  target: TextEditCaptureTarget | null
): TextEditCapture | null {
  if (!target) return null;
  const lineEl = target.closest("[data-text-path]");
  if (!lineEl) return null;
  const textPath = lineEl.getAttribute("data-text-path");
  if (!textPath) return null;
  const zoneEl = lineEl.closest(".zone[data-zone-position]");
  if (!zoneEl) return null;
  const zoneId = zoneEl.getAttribute("data-zone-position");
  if (!zoneId) return null;
  return { zoneId, textPath, value: (lineEl.textContent ?? "").trim() };
}

export default function SlideCanvas({
  slidePlan,
  userSelection,
  finalHtmlUrl,
  isPipelineRunning,
  isPendingLayout,
  pendingLayoutId,
  onCancelPendingLayout,
  onContentEdit,
  onZoneClick,
  onSlideClick,
  onSectionDrop,
  onZoneResize,
  imageOverrides,
  onImageResize,
  onTextEdit,
  structureOverrides,
  onStructureEdit,
}: SlideCanvasProps) {
  const containerRef = useRef<HTMLDivElement>(null);
  const [scale, setScale] = useState(1);
  // iframe ??final.html ???ㅼ젣 .zone DOM boundingClientRect 痢≪젙媛?(?뺢퇋??0~1).
  // key = data-zone-position (e.g., "top" / "bottom" / "primary"). ?닿쾶 SlidePlan
  // ??zone.zone_id ?€ 1:1 ?쇱튂?섎?濡?overlay rendering ??留ㅼ묶 媛€??
  const [measuredZones, setMeasuredZones] = useState<
    Record<string, { x: number; y: number; w: number; h: number }>
  >({});
  // iframe ??.slide-body ??bbox (?뺢퇋??0~1, 1280횞720 湲곗?). slide-base (title /
  // divider / footer) ??洹??몃?. pendingLayout 紐⑤뱶 ?????곸뿭 ?덉뿉留?鍮?layout
  // overlay 瑜?源붿븘??slide-base ??洹몃?濡??좎?.
  const [measuredSlideBody, setMeasuredSlideBody] = useState<{
    x: number;
    y: number;
    w: number;
    h: number;
  } | null>(null);
  // Step B : section drag-drop drop target. ?ъ슜?먭? LeftMdxPanel ??section 移대뱶
  // 瑜?drag ?댁꽌 zone ??drop ??洹?zone ??section ?좊떦. dragOver ??媛뺤“ ?쒖떆.
  const [dragOverZoneId, setDragOverZoneId] = useState<string | null>(null);
  // IMP-51 (#79) u8 ??measured user-content image bboxes inside iframe
  // (slide-absolute percent of 1280횞720, range 0??00). key = data-image-id
  // stamped by u4 (`src/image_id_stamper.py`). Populated in the iframe
  // onLoad measure block alongside measuredZones / measuredSlideBody.
  // Units intentionally match the persisted `image_overrides` axis (u3
  // typed client) and the u7 CSS injection so the overlay math has a
  // single coord space across measured/persisted/emitted values. Used as
  // the baseline geometry when no persisted override exists for that id;
  // `imageOverrides` prop (u11-fed) wins when present.
  const [measuredImages, setMeasuredImages] = useState<
    Record<string, { x: number; y: number; w: number; h: number }>
  >({});
  // IMP-51 (#79) u8 ??currently selected user-content image id (= the one
  // whose drag/resize handles are shown). Set by the click-listener
  // installed inside the iframe contentDocument when edit mode is active.
  // Reset on finalHtmlUrl change and on edit-mode exit so stale ids never
  // leak across runs.
  const [selectedImageId, setSelectedImageId] = useState<string | null>(null);
  // HTML ?몄쭛 紐⑤뱶 ??湲€踰??⑦꽩 (designMode + contentEditable + outline CSS) 李⑥슜.
  // ?쒖꽦 ??iframe ???띿뒪??element 吏곸젒 ?대┃?섏뿬 ?섏젙 媛€?? backend 諛섏쁺?€ 蹂??묒뾽.
  // pendingLayout 怨?諛고???(異⑸룎 諛⑹?).
  // IMP-90 (#90) u11 ??`editMode` enum replaces the prior boolean. The
  // `isEditMode` shim is kept ONLY for the pendingLayout coupling +
  // zone-wrapper visual cues (border / hover / selected styling) that
  // fire whenever any edit mode is active. u12 routes gesture-activating
  // gates through `editGates` so text / structure / image-zone gestures
  // are mutually exclusive.
  const [editMode, setEditMode] = useState<EditMode>("off");
  const isEditMode = editMode !== "off";
  const editGates = computeEditModeGates(editMode, !!isPendingLayout);
  const iframeRef = useRef<HTMLIFrameElement>(null);

  // ?몄쭛 紐⑤뱶 toggle ??iframe contentDocument ??湲€踰??⑦꽩 ?곸슜 / ?댁젣.
  useEffect(() => {
    const iframe = iframeRef.current;
    if (!iframe) return;
    const doc = iframe.contentDocument;
    if (!doc) return;

    // ?몄쭛 紐⑤뱶 outline CSS ????踰덈쭔 二쇱엯 (id 濡?以묐났 諛⑹?)
    let editStyle = doc.getElementById("phase-z-edit-style") as HTMLStyleElement | null;
    if (!editStyle) {
      editStyle = doc.createElement("style");
      editStyle.id = "phase-z-edit-style";
      editStyle.textContent = `
        [contenteditable]:hover { outline: 1px dashed rgba(0,200,83,0.5); cursor: text; }
        [contenteditable]:focus { outline: 2px solid #00C853 !important; outline-offset: 2px; }
      `;
      doc.head.appendChild(editStyle);
    }

    const editableTags = ["DIV", "P", "H1", "H2", "H3", "H4", "SPAN", "LI", "TD", "TH", "FIGCAPTION"];
    let inputHandler: ((e: Event) => void) | null = null;
    // IMP-90 (#90) u13 ??focusout (= bubbling blur) emits one capture per
    // finished line edit; u15 will debounce + PUT.
    let textEditCaptureHandler: ((e: Event) => void) | null = null;
    // IMP-51 (#79) u8 ??user-content image click listeners installed
    // inside the iframe contentDocument. Tracked here so the cleanup
    // callback can remove them when edit mode exits (or iframe reloads).
    const imageClickBindings: Array<{ el: HTMLImageElement; handler: (e: Event) => void; prevCursor: string; prevOutline: string }> = [];

    // IMP-90 (#90) u12 ??text-editing gate: only the 'text' editMode
    // turns designMode on + makes the editable tags contentEditable.
    // The else branch tears the prior state down so leaving text mode
    // (to structure / image-zone / off) immediately disables in-place
    // text editing ??required for mutual exclusivity vs the image-zone
    // overlay's drag/resize gestures (a contentEditable cursor would
    // otherwise be placed by every image click).
    if (editGates.textEditing) {
      doc.designMode = "on";
      doc.querySelectorAll(".slide *").forEach((el) => {
        if (editableTags.includes((el as HTMLElement).tagName)) {
          (el as HTMLElement).setAttribute("contenteditable", "true");
        }
      });
      // ?몄쭛 諛쒖깮 ??hasPendingChanges ?몃━嫄?
      inputHandler = () => {
        onContentEdit?.();
      };
      doc.addEventListener("input", inputHandler);

      textEditCaptureHandler = (ev: Event) => {
        const cap = deriveTextEditCapture(
          ev.target as unknown as TextEditCaptureTarget | null
        );
        if (cap) onTextEdit?.(cap);
      };
      doc.addEventListener("focusout", textEditCaptureHandler);
    } else {
      doc.designMode = "off";
      doc.querySelectorAll("[contenteditable]").forEach((el) => {
        (el as HTMLElement).removeAttribute("contenteditable");
      });
    }

    // IMP-90 (#90) u12 ??image-selection gate: only the 'image-zone'
    // editMode wires the in-iframe user-content image click ??selection.
    // Selector mirrors USER_CONTENT_IMAGE_SELECTOR in image_id_stamper.py
    // (requires data-image-id which the stamper always emits). Decorative
    // / frame imgs lacking the role attribute are NOT clickable. The
    // else branch clears `selectedImageId` so the React-side overlay
    // never lingers on a non-image-zone edit mode.
    if (editGates.imageSelection) {
      const imgEls = doc.querySelectorAll<HTMLImageElement>(
        '.slide img[data-image-role="user-content"][data-image-id]'
      );
      imgEls.forEach((imgEl) => {
        const imgId = imgEl.dataset.imageId;
        if (!imgId) return;
        const handler = (ev: Event) => {
          ev.stopPropagation();
          ev.preventDefault();
          setSelectedImageId(imgId);
        };
        const prevCursor = imgEl.style.cursor;
        const prevOutline = imgEl.style.outline;
        imgEl.style.cursor = "pointer";
        imgEl.style.outline = "1px dashed rgba(16, 185, 129, 0.55)";
        imgEl.addEventListener("click", handler);
        imageClickBindings.push({ el: imgEl, handler, prevCursor, prevOutline });
      });
    } else {
      setSelectedImageId(null);
    }

    return () => {
      if (inputHandler && doc) {
        doc.removeEventListener("input", inputHandler);
      }
      if (textEditCaptureHandler && doc) {
        doc.removeEventListener("focusout", textEditCaptureHandler);
      }
      imageClickBindings.forEach(({ el, handler, prevCursor, prevOutline }) => {
        el.removeEventListener("click", handler);
        el.style.cursor = prevCursor;
        el.style.outline = prevOutline;
      });
    };
  }, [editGates.textEditing, editGates.imageSelection, finalHtmlUrl, onContentEdit, onTextEdit]);

  // pendingLayout 吏꾩엯 ???몄쭛 紐⑤뱶 ?먮룞 OFF (異⑸룎 諛⑹?).
  useEffect(() => {
    if (isPendingLayout && isEditMode) setEditMode("off");
  }, [isPendingLayout, isEditMode]);

  // IMP-90 (#90) u14 ??discover slot keys per zone for the structure
  // overlay. Source = iframe DOM `data-text-path="{slot_key}.{line_index}"`
  // attributes stamped by u8 (`src/text_path_stamper.py`). Unique slot_key
  // prefixes per `.zone[data-zone-position]` form the overlay's slot list.
  // Discovery runs only when entering structure mode (and resets on exit
  // or iframe reload) so off / text / image-zone modes never pay this
  // traversal cost.
  const [slotKeysByZone, setSlotKeysByZone] = useState<
    Record<string, string[]>
  >({});
  useEffect(() => {
    if (editMode !== "structure" || isPendingLayout) {
      setSlotKeysByZone({});
      return;
    }
    const doc = iframeRef.current?.contentDocument;
    if (!doc) return;
    const next: Record<string, string[]> = {};
    doc.querySelectorAll(".zone[data-zone-position]").forEach((zEl) => {
      const zoneId = (zEl as HTMLElement).getAttribute("data-zone-position");
      if (!zoneId) return;
      const seen = new Set<string>();
      const keys: string[] = [];
      zEl.querySelectorAll("[data-text-path]").forEach((lineEl) => {
        const path = (lineEl as HTMLElement).getAttribute("data-text-path");
        if (!path) return;
        const lastDot = path.lastIndexOf(".");
        const slotKey = lastDot > 0 ? path.slice(0, lastDot) : path;
        if (slotKey && !seen.has(slotKey)) {
          seen.add(slotKey);
          keys.push(slotKey);
        }
      });
      next[zoneId] = keys;
    });
    setSlotKeysByZone(next);
  }, [editMode, isPendingLayout, finalHtmlUrl]);

  // #98 Task 4 ??reset iframe-derived UI state whenever a render is replaced,
  // cleared, or hidden by a new pipeline run. This prevents stale zone
  // measurements / edit overlays from lingering over the next final.html.
  useEffect(() => {
    setMeasuredZones({});
    setMeasuredSlideBody(null);
    setMeasuredImages({});
    setSelectedImageId(null);
    setDragOverZoneId(null);
    setSlotKeysByZone({});
    setEditMode("off");
  }, [finalHtmlUrl, isPipelineRunning, isPendingLayout]);

  // 16:9 鍮꾩쑉 ?좎??섎ʼn 而⑦뀒?대꼫???듭㎏濡?fit (?ㅽ겕濡?X).
  useEffect(() => {
    const el = containerRef.current;
    if (!el) return;

    const updateScale = () => {
      const padding = 32; // 而⑦뀒?대꼫 ?묒そ ?щ갚 (1rem * 2)
      const cw = el.clientWidth - padding;
      const ch = el.clientHeight - padding;
      if (cw <= 0 || ch <= 0) return;
      const sw = cw / SLIDE_W;
      const sh = ch / SLIDE_H;
      setScale(Math.min(sw, sh));
    };

    updateScale();
    const ro = new ResizeObserver(updateScale);
    ro.observe(el);
    window.addEventListener("resize", updateScale);
    return () => {
      ro.disconnect();
      window.removeEventListener("resize", updateScale);
    };
  }, []);

  // Empty state ??MDX ?낅줈????
  const isEmpty = !finalHtmlUrl && !slidePlan && !isPipelineRunning && !isPendingLayout;
  const hasNoCurrentRender =
    !finalHtmlUrl && !!slidePlan && !isPipelineRunning && !isPendingLayout;
  // ?щ씪?대뱶 諛뺤뒪 ?쒖떆 議곌굔 ??final.html ?덇굅??pendingLayout 紐⑤뱶.
  // Task 13b: pending layout is a draft canvas, not a final.html preview.
  // Hide the iframe entirely while pending so the prior committed render
  // cannot visually overlap the pending zones.
  const renderIframe = !!finalHtmlUrl && !isPendingLayout;
  const showSlideBox = (renderIframe || isPendingLayout) && !isPipelineRunning;
  const pendingSlideBody = measuredSlideBody ?? { x: 0, y: 0, w: 1, h: 1 };

  // IMP-14 (Step 13 A-4) ??backend slide_base.html 媛€ embedded vs standalone CSS
  // contract 瑜?`?embedded=1` query 濡??뚯쑀. 湲곗〈 query string 蹂댁〈?섎㈃??flag 留?異붽?.
  const embeddedSrc = renderIframe && finalHtmlUrl
    ? `${finalHtmlUrl}${finalHtmlUrl.includes("?") ? "&" : "?"}embedded=1`
    : undefined;

  // wrapper ??scaled ?ш린瑜?媛€吏€誘€濡?layout ??fit. ?덉쓽 ?щ씪?대뱶??1280횞720 ?쇰줈
  // top-left origin scale ??wrapper ?덉뿉 ?뺥솗??留욎땄.
  const W_SCALED = SLIDE_W * scale;
  const H_SCALED = SLIDE_H * scale;

  return (
    <div
      ref={containerRef}
      className="flex-1 flex items-center justify-center bg-slate-100 p-4 relative overflow-hidden"
    >
      {isEmpty && (
        <div className="text-center text-slate-400 select-none">
          <UploadIcon className="w-12 h-12 mx-auto mb-3 text-slate-300" />
          <p className="text-sm font-medium">Upload an MDX file from the left panel.</p>
          <p className="text-xs text-slate-300 mt-1">
            After upload, run the slide generation action from the footer.
          </p>
        </div>
      )}

      {isPipelineRunning && (
        <div className="text-center text-slate-500 select-none">
          <Loader2 className="w-10 h-10 mx-auto mb-3 text-blue-500 animate-spin" />
          <p className="text-sm font-bold">Phase Z pipeline is running...</p>
          <p className="text-xs text-slate-400 mt-1">
            Parsing MDX, matching frames, choosing layout, and rendering.
          </p>
        </div>
      )}

      {hasNoCurrentRender && (
        <div className="text-center text-slate-500 select-none max-w-sm">
          <p className="text-sm font-bold">No current render</p>
          <p className="text-xs text-slate-400 mt-1">
            Run the pipeline to display a fresh final.html result.
          </p>
        </div>
      )}

      {showSlideBox && (
        <div
          className="relative overflow-hidden cursor-pointer bg-white shadow-[0_40px_100px_-20px_rgba(0,0,0,0.2)]"
          style={{ width: W_SCALED, height: H_SCALED }}
          onClick={(e) => {
            // wrapper ?먯껜 ?대┃ (zone overlay 媛€ ?꾨땶 ?곸뿭) = slide ?꾩껜 = Layout ??
            // zone overlay ??stopPropagation ?쇰줈 ?ш린源뚯? ????
            if (e.target === e.currentTarget && onSlideClick) onSlideClick();
          }}
          title={
            isPendingLayout
              ? `Pending layout: ${pendingLayoutId} - assign sections, choose frames, then regenerate`
              : "Open layout panel"
          }
        >
          {/* pendingLayout ???뚮쭔 ?몄텧?섎뒗 ?곗긽??痍⑥냼 踰꾪듉 (slide 諛뺤뒪 ?멸낸 ?좎?) */}
          {isPendingLayout && onCancelPendingLayout && (
            <button
              onClick={(e) => {
                e.stopPropagation();
                onCancelPendingLayout();
              }}
              className="absolute top-2 right-2 z-30 text-[10px] font-bold uppercase tracking-tighter px-2 py-1 rounded bg-slate-800 text-white hover:bg-slate-700 shadow"
              style={{ pointerEvents: "auto" }}
            >
              痍⑥냼
            </button>
          )}

          {/* IMP-90 (#90) u11 ??discriminated edit-mode toolbar.
              Replaces the prior single ??toggle. Three modes (text /
              structure / image-zone) are mutually exclusive; clicking the
              active mode toggles back to 'off'. Gesture gating per mode is
              u12 ??u11 only plants the state + UI surface, so all three
              modes currently share the same `isEditMode` shim behavior. */}
          {!isPendingLayout && finalHtmlUrl && (
            <div
              data-testid="edit-mode-toolbar"
              className="absolute top-2 right-2 z-30 flex gap-1"
              style={{ pointerEvents: "auto" }}
            >
              {EDIT_MODES.map((mode) => {
                const active = editMode === mode;
                const label =
                  mode === "text" ? "Text" : mode === "structure" ? "Structure" : "Image/Zone";
                const title =
                  mode === "text"
                    ? "Edit text in the rendered slide"
                    : mode === "structure"
                    ? "Edit slot order and visibility"
                    : "Move or resize images and zones";
                return (
                  <button
                    key={mode}
                    type="button"
                    data-testid={`edit-mode-${mode}`}
                    aria-pressed={active}
                    onClick={(e) => {
                      e.stopPropagation();
                      setEditMode((prev) => nextEditMode(prev, mode));
                    }}
                    className={`text-[10px] font-bold uppercase tracking-tighter px-2.5 py-1 rounded shadow transition ${
                      active
                        ? "bg-emerald-500 text-white hover:bg-emerald-600 ring-2 ring-emerald-200"
                        : "bg-white text-slate-700 hover:bg-slate-100 border border-slate-200"
                    }`}
                    title={title}
                  >
                    {label}
                  </button>
                );
              })}
            </div>
          )}

          <div
            style={{
              width: SLIDE_W,
              height: SLIDE_H,
              transform: `scale(${scale})`,
              transformOrigin: "top left",
              position: "absolute",
              top: 0,
              left: 0,
              pointerEvents: "none",
            }}
          >
            {renderIframe && embeddedSrc && (
            <iframe
              key={embeddedSrc}
              ref={iframeRef}
              src={embeddedSrc}
              title="Phase Z ?뚮뜑 寃곌낵"
              className="w-full h-full border-0 block"
              scrolling="no"
              sandbox="allow-same-origin allow-scripts"
              // IMP-90 (#90) u12 ??iframe pointer-events gate. 'text' needs
              // pe:auto so the user can click into text fields; 'image-zone'
              // needs pe:auto so user-content image clicks can reach the
              // in-iframe click handler that drives `selectedImageId`.
              // 'structure' and 'off' keep pe:none ??structure has no
              // in-iframe gesture (u14 will overlay React-side controls).
              style={{ pointerEvents: editGates.iframePointerAuto ? "auto" : "none" }}
              onLoad={(e) => {
                // IMP-14 (Step 13 A-4) ??embedded vs standalone CSS reset ?€ backend
                // slide_base.html 媛€ `?embedded=1` query 濡??뚯쑀. frontend 媛€ ???댁긽
                // reset CSS 瑜?contentDocument ??inject ?섏? ?딆쓬. embedded query 媛€
                // backend auto-mode detection script 瑜?trigger ?댁꽌 html.embedded
                // class 瑜?遺숈씠怨?standalone-only body 洹쒖튃??reset.
                try {
                  const doc = (e.currentTarget as HTMLIFrameElement).contentDocument;
                  if (!doc) return;

                  // ?€?€ Zone DOM 痢≪젙 ?€?€
                  // backend final.html ??.zone[data-zone-position="..."] ?붿냼瑜?
                  // 李얠븘??boundingClientRect 痢≪젙 ??1280횞720 湲곗? ?뺢퇋??
                  // overlay 媛€ ??痢≪젙媛믪쑝濡?洹몃젮吏€誘€濡?backend ??layout (slide-base
                  // padding / dynamic ratios / grid) 洹몃?濡?諛섏쁺??
                  const zoneEls = doc.querySelectorAll(
                    ".zone[data-zone-position]"
                  );
                  const measured: Record<
                    string,
                    { x: number; y: number; w: number; h: number }
                  > = {};
                  zoneEls.forEach((el) => {
                    const r = (el as HTMLElement).getBoundingClientRect();
                    const pos = (el as HTMLElement).dataset.zonePosition;
                    if (!pos) return;
                    measured[pos] = {
                      x: r.left / SLIDE_W,
                      y: r.top / SLIDE_H,
                      w: r.width / SLIDE_W,
                      h: r.height / SLIDE_H,
                    };
                  });
                  setMeasuredZones(measured);

                  // .slide-body 痢≪젙 ??pendingLayout 紐⑤뱶 ?????곸뿭?먮쭔 鍮?
                  // overlay 瑜?源붿븘??slide-base (title / footer) ???좎?.
                  const bodyEl = doc.querySelector(".slide-body");
                  if (bodyEl) {
                    const r = (bodyEl as HTMLElement).getBoundingClientRect();
                    setMeasuredSlideBody({
                      x: r.left / SLIDE_W,
                      y: r.top / SLIDE_H,
                      w: r.width / SLIDE_W,
                      h: r.height / SLIDE_H,
                    });
                  }

                  // ?€?€ IMP-51 (#79) u8 ??user-content image bbox 痢≪젙 ?€?€
                  // u4 stamper 媛€ 遺€李⑺븳 data-image-id 媛€ ?덈뒗 img 留??≪쓬
                  // (decorative / frame img ?쒖쇅). 痢≪젙 寃곌낵??1280횞720 湲곗?
                  // ?щ씪?대뱶-?덈? percent (0??00) ??image_overrides axis (u3
                  // ?€??+ u7 CSS `left/top/width/height: {value}%` 二쇱엯) ?€
                  // ?숈씪??醫뚰몴怨꾨씪??痢≪젙 / ?곴뎄 ?€??/ emit 媛€ 1:1 留ㅼ묶??
                  const imageEls = doc.querySelectorAll<HTMLImageElement>(
                    '.slide img[data-image-role="user-content"][data-image-id]'
                  );
                  const measuredImg: Record<
                    string,
                    { x: number; y: number; w: number; h: number }
                  > = {};
                  imageEls.forEach((imgEl) => {
                    const id = imgEl.dataset.imageId;
                    if (!id) return;
                    const r = imgEl.getBoundingClientRect();
                    if (r.width <= 0 || r.height <= 0) return;
                    measuredImg[id] = {
                      x: (r.left / SLIDE_W) * 100,
                      y: (r.top / SLIDE_H) * 100,
                      w: (r.width / SLIDE_W) * 100,
                      h: (r.height / SLIDE_H) * 100,
                    };
                  });
                  setMeasuredImages(measuredImg);
                } catch (err) {
                  console.warn("[SlideCanvas] iframe inject/measure ?ㅽ뙣:", err);
                }
              }}
            />
            )}
          </div>

          {/* ?€?€ pendingLayout ??slide-body ?곸뿭 overlay ?€?€
            slide-base (title / divider / footer) ??final.html 洹몃?濡??좎?.
            slide-body ?곸뿭?먮쭔 ??dashed overlay 源붿븘??湲곗〈 .zone ??媛€由ш퀬
            ??layout zone ?덈궡 ?쒖떆. */}
          {isPendingLayout && (
            <div
              className="absolute bg-white border-2 border-dashed border-amber-400 z-10"
              style={{
                left: `${pendingSlideBody.x * 100}%`,
                top: `${pendingSlideBody.y * 100}%`,
                width: `${pendingSlideBody.w * 100}%`,
                height: `${pendingSlideBody.h * 100}%`,
                pointerEvents: "none",
              }}
            >
              <div className="absolute inset-0 flex items-center justify-center pointer-events-none">
                <div className="text-center select-none">
                  <span className="text-[10px] font-black uppercase tracking-widest text-amber-500 block mb-1">
                    Pending Body Layout
                  </span>
                  <span className="text-lg font-bold text-slate-500 block">
                    {pendingLayoutId}
                  </span>
                  <span className="text-[10px] text-slate-400 block mt-1">
                    1. section 移대뱶 ??zone drop &nbsp;쨌&nbsp; 2. zone ?대┃ ??frame ?좏깮 &nbsp;쨌&nbsp; 3. ?ъ깮??
                  </span>
                </div>
              </div>
            </div>
          )}

          {/* ?€?€ Zone overlay layer ?€?€
            normal mode : measuredZones (= iframe ??.zone DOM bbox) ?곗꽑.
            pendingLayout : zone.position (computeZonePositions 寃곌낵 = slide-body
              ?대? 0~1) ??measuredSlideBody ???덈? ?뺢퇋?붾줈 蹂€??
            isEditMode : zone overlay 諛섑닾紐?+ pointer-events: none ???띿뒪???몄쭛
              諛⑺빐 X. resize handle 留?pointer-events: auto 濡??쒖꽦. */}
          {slidePlan?.zones.map((zone) => {
            // selectedZoneId ??zone.id ?먮뒗 zone.zone_id 以??대뒓 履쎌씠??留ㅼ묶 (utils
            // ??getSelectedZone ???묒そ 蹂대?濡??쇨?).
            const isSelected =
              userSelection.selectedZoneId === zone.id ||
              userSelection.selectedZoneId === zone.zone_id;
            const isDragOver = dragOverZoneId === zone.id;
            // Step B : zone overlay ?쇰꺼 = section_ids 湲곕컲 (S1, S1+S2 ??.
            // backend zone position (top/bottom/primary) ?€ 遺€ ?쇰꺼 / tooltip ?쇰줈.
            // pendingLayout 紐⑤뱶?먯꽌??override 留??ъ슜 (default 臾댁떆 ??鍮??곹깭濡??쒖옉).
            const sectionIds = isPendingLayout
              ? userSelection.overrides.zone_sections?.[zone.zone_id] ?? []
              : userSelection.overrides.zone_sections?.[zone.zone_id] ??
                zone.section_ids;
            const sectionLabel =
              sectionIds.length > 0
                ? sectionIds
                    .map((s) => `S${s.split("-").pop() ?? s}`)
                    .join("+")
                : "(empty)";
            // 醫뚰몴 寃곗젙 (schema ?듭씪 ???ъ슜??override ????긽 slide-body ?대? 0~1) :
            //   override ?덉쓬 (zone_geometries) ??slide-body 湲곗? ??1280횞720 ?덈? 蹂€??
            //   pending mode + override ?놁쓬 ??zone.position (slide-body 湲곗?) 蹂€??
            //   normal mode + override ?놁쓬 ??measuredZones (1280횞720 ?덈?) 吏곸젒.
            const overrideGeom =
              userSelection.overrides.zone_geometries?.[zone.zone_id] as
                | { x: number; y: number; w: number; h: number }
                | undefined;
            const localGeom = overrideGeom ?? {
              x: zone.position.x,
              y: zone.position.y,
              w: zone.position.width,
              h: zone.position.height,
            };
            let x: number, y: number, width: number, height: number;
            if (overrideGeom && (measuredSlideBody || isPendingLayout)) {
              // ?ъ슜??override ??slide-body 湲곗?
              x = pendingSlideBody.x + overrideGeom.x * pendingSlideBody.w;
              y = pendingSlideBody.y + overrideGeom.y * pendingSlideBody.h;
              width = overrideGeom.w * pendingSlideBody.w;
              height = overrideGeom.h * pendingSlideBody.h;
            } else if (isPendingLayout) {
              x = pendingSlideBody.x + zone.position.x * pendingSlideBody.w;
              y = pendingSlideBody.y + zone.position.y * pendingSlideBody.h;
              width = zone.position.width * pendingSlideBody.w;
              height = zone.position.height * pendingSlideBody.h;
            } else {
              const measured = measuredZones[zone.zone_id];
              x = measured?.x ?? zone.position.x;
              y = measured?.y ?? zone.position.y;
              width = measured?.w ?? zone.position.width;
              height = measured?.h ?? zone.position.height;
            }

            // Step C : pending mode ??zone overlay resize handles ??independent 紐⑤뜽.
            // 媛?zone ???낅┰ 諛뺤뒪 ???몄젒 zone ?곹뼢 X. ?먯쑀 諛곗튂 (gap / 寃뱀묠 ?ъ슜??梨낆엫).
            // boundary drag 紐⑤뜽 (?몄젒 ?먮룞 議곗젙) ?€ grid 媛숈? 臾띠쓬 layout ???곹빀?쒕뜲,
            // ?ъ슜???섎룄 = zone position drag 源뚯? ?먯쑀濡?쾶 ??independent 媛€ ?먯뿰.
            type ResizeDir =
              | "top"
              | "bottom"
              | "left"
              | "right"
              | "nw"
              | "ne"
              | "sw"
              | "se";
            const makeResizeHandler = (
              direction: ResizeDir
            ) => (ev: React.MouseEvent<HTMLDivElement>) => {
              // resize ??pendingLayout OR image-zone ?몄쭛 紐⑤뱶 ?쒖꽦. 2026-05-22
              // demo hot-fix ??frame partial ??@container aspect-ratio ?뚯쟾??
              // ?ㅼ뼱媛€??fixed px ?쒖빟 ?щ씪吏? IMP-90 u12: text/structure 紐⑤뱶
              // ?먯꽌??zone resize 鍮꾪솢??(mutually exclusive per editGates).
              if ((!isPendingLayout && !editGates.zoneGestures) || !onZoneResize) return;
              ev.preventDefault();
              ev.stopPropagation();
              const startMouseX = ev.clientX;
              const startMouseY = ev.clientY;
              const startGeom: { x: number; y: number; w: number; h: number } =
                overrideGeom ? { ...overrideGeom } : { ...localGeom };
              const slideBodyWidthPx = W_SCALED * pendingSlideBody.w;
              const slideBodyHeightPx = H_SCALED * pendingSlideBody.h;
              const minSize = 0.05;

              const affectsLeft = direction === "left" || direction === "nw" || direction === "sw";
              const affectsRight = direction === "right" || direction === "ne" || direction === "se";
              const affectsTop = direction === "top" || direction === "nw" || direction === "ne";
              const affectsBottom = direction === "bottom" || direction === "sw" || direction === "se";

              // 2026-05-22 demo hot-fix ??iframe ??留덉슦??媛€濡쒖콈??mouseup leak ?쇱뼱??
              // (?몄쭛 紐⑤뱶?먯꽌 iframe pointerEvents=auto). drag ?숈븞 iframe 媛뺤젣 none.
              const iframeEl = iframeRef.current;
              const prevIframePE = iframeEl ? iframeEl.style.pointerEvents : "";
              if (iframeEl) iframeEl.style.pointerEvents = "none";

              const onMove = (mv: MouseEvent) => {
                const dx = (mv.clientX - startMouseX) / slideBodyWidthPx;
                const dy = (mv.clientY - startMouseY) / slideBodyHeightPx;
                let { x, y, w, h } = startGeom;
                if (affectsRight) {
                  w = Math.max(minSize, Math.min(1 - startGeom.x, startGeom.w + dx));
                }
                if (affectsBottom) {
                  h = Math.max(minSize, Math.min(1 - startGeom.y, startGeom.h + dy));
                }
                if (affectsLeft) {
                  // 醫뚯륫 寃쎄퀎 ?대룞 ??w 以꾩씠怨?x ?섎┝ (?먮뒗 諛섎?)
                  const newW = Math.max(minSize, startGeom.w - dx);
                  x = Math.max(0, startGeom.x + (startGeom.w - newW));
                  w = newW;
                }
                if (affectsTop) {
                  const newH = Math.max(minSize, startGeom.h - dy);
                  y = Math.max(0, startGeom.y + (startGeom.h - newH));
                  h = newH;
                }
                onZoneResize({ [zone.zone_id]: { x, y, w, h } });
              };
              const onUp = () => {
                document.removeEventListener("mousemove", onMove);
                document.removeEventListener("mouseup", onUp);
                if (iframeEl) iframeEl.style.pointerEvents = prevIframePE;
              };
              document.addEventListener("mousemove", onMove);
              document.addEventListener("mouseup", onUp);
            };
            const handleResizeTop = makeResizeHandler("top");
            const handleResizeBottom = makeResizeHandler("bottom");
            const handleResizeLeft = makeResizeHandler("left");
            const handleResizeRight = makeResizeHandler("right");
            const handleResizeNW = makeResizeHandler("nw");
            const handleResizeNE = makeResizeHandler("ne");
            const handleResizeSW = makeResizeHandler("sw");
            const handleResizeSE = makeResizeHandler("se");

            // zone position drag ??pending mode ?먯꽌 zone body (handle ???곸뿭)
            // mousedown drag 濡?x/y ?대룞. drag vs click 援щ텇 :
            //   5px 誘몃쭔 ?대룞 = click ??onZoneClick
            //   5px ?댁긽 = drag ??onZoneResize 濡?x/y 蹂€寃?
            const handleZoneMouseDown = (
              ev: React.MouseEvent<HTMLDivElement>
            ) => {
              ev.stopPropagation();
              // IMP-90 u12: zone drag is image-zone-mode-only (text /
              // structure suppress canDrag; non-zoneGestures click still
              // triggers onZoneClick via the !dragged branch on mouse-up).
              const canDrag = !!((isPendingLayout || editGates.zoneGestures) && onZoneResize);
              const startMouseX = ev.clientX;
              const startMouseY = ev.clientY;
              const startGeom = { ...localGeom };
              const slideBodyWidthPx = canDrag
                ? W_SCALED * pendingSlideBody.w
                : 1;
              const slideBodyHeightPx = canDrag
                ? H_SCALED * pendingSlideBody.h
                : 1;
              let dragged = false;

              // 2026-05-22 demo hot-fix ??same iframe pointer-events fix as makeResizeHandler.
              const iframeEl = iframeRef.current;
              const prevIframePE = iframeEl ? iframeEl.style.pointerEvents : "";
              if (iframeEl) iframeEl.style.pointerEvents = "none";

              const onMove = (mv: MouseEvent) => {
                if (!canDrag) return;
                const dxPx = mv.clientX - startMouseX;
                const dyPx = mv.clientY - startMouseY;
                if (!dragged && crossedDragThreshold(dxPx, dyPx)) {
                  dragged = true;
                }
                if (dragged) {
                  const { x: newX, y: newY } = clampZoneMove(
                    startGeom,
                    dxPx,
                    dyPx,
                    slideBodyWidthPx,
                    slideBodyHeightPx
                  );
                  onZoneResize!({
                    [zone.zone_id]: {
                      x: newX,
                      y: newY,
                      w: startGeom.w,
                      h: startGeom.h,
                    },
                  });
                }
              };
              const onUp = () => {
                document.removeEventListener("mousemove", onMove);
                document.removeEventListener("mouseup", onUp);
                if (iframeEl) iframeEl.style.pointerEvents = prevIframePE;
                if (!dragged) {
                  // ?⑥닚 click ?쇰줈 泥섎━ ??onZoneClick.
                  onZoneClick?.(zone.id);
                }
              };
              document.addEventListener("mousemove", onMove);
              document.addEventListener("mouseup", onUp);
            };

            // Step A : ?ъ슜?먭? ?ㅻⅨ frame ??怨⑤옄????洹?preview 瑜?zone ?덉뿉
            // 諛섑닾紐낆쑝濡?誘몃━蹂닿린. final.html (iframe) ??default frame 怨??ㅻ? ?뚮쭔.
            // override ?녾굅??default ?€ 媛숈쑝硫?誘몃━蹂닿린 X (iframe 怨?以묐났).
            const region = zone.internal_regions[0];
            const defaultFrameId = region?.frame_match_strategy.frame_id;
            const overrideFrameId = region?.id
              ? userSelection.overrides.zone_frames?.[region.id]
              : undefined;
            const previewFrameId =
              overrideFrameId && overrideFrameId !== defaultFrameId
                ? overrideFrameId
                : null;
            const previewCandidate = previewFrameId
              ? region?.frame_candidates?.find((c) => c.id === previewFrameId)
              : null;
            const previewUrl = previewCandidate?.thumbnailUrl ?? null;

            // IMP-11 u4: active frame lookup ??distinct axis from preview.
            // preview is shown only when override differs from default; active is
            // always defined as override-if-present-else-default. Used by u5 to
            // compare the active frame's catalog min_height_px against zone height.
            const activeFrameId = overrideFrameId ?? defaultFrameId;
            const activeCandidate = activeFrameId
              ? region?.frame_candidates?.find((c) => c.id === activeFrameId)
              : undefined;

            // IMP-11 u5: catalog min_height_px violation hint. height is already
            // a fraction of SLIDE_H (1280x720 logical px coordinate space), so
            // logical px = height * SLIDE_H. measuredSlideBody.h is intentionally
            // not re-multiplied (double-apply would shrink the comparison value).
            // Hint is pendingLayout-only; resize clamp (minSize=0.05) is unchanged.
            const zoneHeightPx = isPendingLayout ? height * SLIDE_H : null;
            const minHeightPx = activeCandidate?.minHeightPx ?? null;
            const belowMinHeight =
              isPendingLayout &&
              minHeightPx != null &&
              zoneHeightPx != null &&
              zoneHeightPx < minHeightPx;

            return (
              <div
                key={zone.id}
                role="button"
                tabIndex={0}
                onMouseDown={handleZoneMouseDown}
                onDragEnter={(ev) => {
                  ev.preventDefault();
                  ev.stopPropagation();
                  // 釉뚮씪?곗???custom dataTransfer type ??lowercase 媛뺤젣 ???묒そ ??check.
                  const types = Array.from(ev.dataTransfer.types).map((t) => t.toLowerCase());
                  if (types.includes("sectionid") || types.includes("section-id")) {
                    setDragOverZoneId(zone.id);
                  }
                }}
                onDragOver={(ev) => {
                  // drop target ?대젮硫?onDragOver ?먯꽌 preventDefault ?꾩닔 ??type check ?놁씠 臾댁“嫄??덉슜.
                  ev.preventDefault();
                  ev.dataTransfer.dropEffect = "move";
                }}
                onDragLeave={(ev) => {
                  // ?먯떇?쇰줈 ?ㅼ뼱媛€硫댁꽌 諛쒖깮?섎뒗 leave 臾댁떆 ???ㅼ젣 leave 留?泥섎━.
                  if (ev.currentTarget.contains(ev.relatedTarget as Node)) return;
                  setDragOverZoneId((p) => (p === zone.id ? null : p));
                }}
                onDrop={(ev) => {
                  ev.preventDefault();
                  ev.stopPropagation();
                  setDragOverZoneId(null);
                  // setData ?덈뜕 紐⑤뱺 type ???쒕룄 ??case 蹂€??/ ?ㅻⅨ ??fallback.
                  const sectionId =
                    ev.dataTransfer.getData("sectionId") ||
                    ev.dataTransfer.getData("section-id") ||
                    ev.dataTransfer.getData("text/plain");
                  if (sectionId && onSectionDrop) {
                    onSectionDrop(sectionId, zone.zone_id);
                  }
                }}
                className={`absolute z-20 transition-all overflow-hidden ${
                  isEditMode
                    ? "border border-dashed border-emerald-300/40 cursor-default"
                    : isPendingLayout
                    ? "cursor-grab active:cursor-grabbing"
                    : "cursor-pointer"
                } ${
                  isDragOver
                    ? "border-4 border-emerald-500 bg-emerald-100/30 shadow-[0_0_0_4px_rgba(16,185,129,0.3)]"
                    : isSelected && isEditMode
                    ? "border-2 border-emerald-500 bg-emerald-500/10 shadow-[0_0_0_2px_rgba(16,185,129,0.25)]"
                    : isSelected && !isEditMode
                    ? "border-2 border-blue-500 bg-blue-500/10 shadow-[0_0_0_2px_rgba(59,130,246,0.2)]"
                    : !isEditMode
                    ? "border border-dashed border-slate-300/40 hover:border-blue-400 hover:bg-blue-500/5"
                    : ""
                }`}
                style={{
                  left: `${x * 100}%`,
                  top: `${y * 100}%`,
                  width: `${width * 100}%`,
                  height: `${height * 100}%`,
                  // ?몄쭛 紐⑤뱶 : zone overlay ?먯껜???대┃ ?듦낵 (?띿뒪???몄쭛 ?곗꽑),
                  // resize handle 留?洹??덉뿉??pointer-events: auto.
                  pointerEvents: isEditMode ? "none" : "auto",
                }}
                title={
                  previewUrl
                    ? `${sectionLabel} (zone: ${zone.zone_id}) - preview frame ${previewCandidate?.name}`
                    : `${sectionLabel} (zone: ${zone.zone_id}) - open frame panel or drop a section`
                }
              >
                {/* Step A : ?좏깮 frame preview 誘몃━蹂닿린 (諛섑닾紐? iframe 怨?以묐났 X) */}
                {previewUrl && (
                  <>
                    <img
                      src={previewUrl}
                      alt={`${zone.zone_id} preview`}
                      className="absolute inset-0 w-full h-full object-contain bg-white/60 opacity-70 pointer-events-none"
                    />
                    {/* "preview" 諛곗? ???곗긽??*/}
                    <span className="absolute top-1 right-1 text-[9px] font-black uppercase tracking-tighter px-1.5 py-0.5 rounded bg-amber-500 text-white shadow">
                      preview
                    </span>
                  </>
                )}

                {/* IMP-11 u5: red border + 'min H Npx' badge when zone height
                    is below the active frame's catalog min_height_px. Visual
                    hint only, no clamp/resize behavior change. */}
                {belowMinHeight && minHeightPx != null && (
                  <>
                    <div className="absolute inset-0 pointer-events-none border-2 border-red-500" />
                    <span className="absolute bottom-1 right-1 text-[9px] font-black uppercase tracking-tighter px-1.5 py-0.5 rounded bg-red-500 text-white shadow pointer-events-none">
                      min H {minHeightPx}px
                    </span>
                  </>
                )}

                {/* zone ?쇰꺼 ??醫뚯긽?? 二??쇰꺼 = section ids (S1, S1+S2),
                    遺€ ?쇰꺼 = backend zone position (top, bottom, primary). */}
                <div className="absolute top-1 left-1 flex items-center gap-1 pointer-events-none">
                  <span
                    className={`text-[10px] font-black uppercase tracking-tighter px-1.5 py-0.5 rounded ${
                      isSelected
                        ? "bg-blue-600 text-white"
                        : isDragOver
                        ? "bg-emerald-600 text-white"
                        : "bg-slate-900/80 text-white"
                    }`}
                  >
                    {sectionLabel}
                  </span>
                  <span className="text-[8px] font-bold uppercase tracking-tighter px-1 py-0.5 rounded bg-white/80 text-slate-500">
                    {zone.zone_id}
                  </span>
                </div>

                {/* drop hint ??drag over ??媛€?대뜲???덈궡 */}
                {isDragOver && (
                  <div className="absolute inset-0 flex items-center justify-center pointer-events-none">
                    <span className="text-[12px] font-black uppercase tracking-wider px-3 py-1.5 rounded-full bg-emerald-500 text-white shadow-xl">
                      Drop to assign
                    </span>
                  </div>
                )}

                {/* Step C : zone resize handles ??8 諛⑺뼢. pendingLayout OR image-zone
                    ?몄쭛 紐⑤뱶 ?쒖꽦. 2026-05-22 demo hot-fix ??frame partial ??@container
                    aspect-ratio ?뚯쟾 ?ㅼ뼱媛???fixed px ?쒖빟 ?щ씪??image-zone 紐⑤뱶 resize
                    ???섎? ?덉쓬. IMP-90 u12: text / structure 紐⑤뱶?먯꽌??zone resize
                    affordance 誘몃끂異?(editGates.zoneGestures = image-zone only).
                    edge handle (top/bottom/left/right) : ??boundary ?대룞
                    corner handle (nw/ne/sw/se) : ??boundary ?숈떆. */}
                {(isPendingLayout || editGates.zoneGestures) && onZoneResize && (
                  <>
                    {/* top edge */}
                    <div
                      onMouseDown={handleResizeTop}
                      onClick={(ev) => ev.stopPropagation()}
                      className="absolute -top-1 left-1/4 w-1/2 h-2 bg-blue-500/70 hover:bg-blue-500 rounded cursor-ns-resize z-30 transition shadow"
                      style={{ pointerEvents: "auto" }}
                      title="?곷떒 boundary 議곗젅"
                    />
                    {/* bottom edge */}
                    <div
                      onMouseDown={handleResizeBottom}
                      onClick={(ev) => ev.stopPropagation()}
                      className="absolute -bottom-1 left-1/4 w-1/2 h-2 bg-blue-500/70 hover:bg-blue-500 rounded cursor-ns-resize z-30 transition shadow"
                      style={{ pointerEvents: "auto" }}
                      title="?섎떒 boundary 議곗젅"
                    />
                    {/* left edge */}
                    <div
                      onMouseDown={handleResizeLeft}
                      onClick={(ev) => ev.stopPropagation()}
                      className="absolute top-1/4 -left-1 h-1/2 w-2 bg-blue-500/70 hover:bg-blue-500 rounded cursor-ew-resize z-30 transition shadow"
                      style={{ pointerEvents: "auto" }}
                      title="醫뚯륫 boundary 議곗젅"
                    />
                    {/* right edge */}
                    <div
                      onMouseDown={handleResizeRight}
                      onClick={(ev) => ev.stopPropagation()}
                      className="absolute top-1/4 -right-1 h-1/2 w-2 bg-blue-500/70 hover:bg-blue-500 rounded cursor-ew-resize z-30 transition shadow"
                      style={{ pointerEvents: "auto" }}
                      title="?곗륫 boundary 議곗젅"
                    />
                    {/* corner NW (醫뚯긽?? */}
                    <div
                      onMouseDown={handleResizeNW}
                      onClick={(ev) => ev.stopPropagation()}
                      className="absolute -top-1 -left-1 w-3 h-3 bg-white border-2 border-blue-500 rounded-sm cursor-nwse-resize z-30 hover:scale-125 transition shadow"
                      style={{ pointerEvents: "auto" }}
                      title="醫뚯긽???숈떆 議곗젅"
                    />
                    {/* corner NE (?곗긽?? */}
                    <div
                      onMouseDown={handleResizeNE}
                      onClick={(ev) => ev.stopPropagation()}
                      className="absolute -top-1 -right-1 w-3 h-3 bg-white border-2 border-blue-500 rounded-sm cursor-nesw-resize z-30 hover:scale-125 transition shadow"
                      style={{ pointerEvents: "auto" }}
                      title="?곗긽???숈떆 議곗젅"
                    />
                    {/* corner SW (醫뚰븯?? */}
                    <div
                      onMouseDown={handleResizeSW}
                      onClick={(ev) => ev.stopPropagation()}
                      className="absolute -bottom-1 -left-1 w-3 h-3 bg-white border-2 border-blue-500 rounded-sm cursor-nesw-resize z-30 hover:scale-125 transition shadow"
                      style={{ pointerEvents: "auto" }}
                      title="醫뚰븯???숈떆 議곗젅"
                    />
                    {/* corner SE (?고븯?? */}
                    <div
                      onMouseDown={handleResizeSE}
                      onClick={(ev) => ev.stopPropagation()}
                      className="absolute -bottom-1 -right-1 w-4 h-4 bg-white border-2 border-blue-500 rounded-sm cursor-nwse-resize z-30 hover:scale-125 transition shadow"
                      style={{ pointerEvents: "auto" }}
                      title="?고븯???숈떆 議곗젅"
                    />
                  </>
                )}

                {/* IMP-54 u1: edit-mode body-drag gesture surfaces.
                    wrapper sets pointerEvents:none in edit mode (see above) to
                    preserve iframe text-edit clicks (A8 guardrail), so the
                    wrapper-level handleZoneMouseDown is unreachable in edit mode.
                    These 4 perimeter strips + top-left grip provide a separate
                    pointer-event surface routing into handleZoneMouseDown.
                    zIndex 25 sits BELOW the 8 resize handles (z-30) so resize
                    gesture wins in overlap regions, and ABOVE the iframe so the
                    strips intercept the perimeter while the un-covered iframe
                    interior keeps text-edit reachability intact.
                    pendingLayout mode already has wrapper pointerEvents:auto,
                    so these surfaces are only needed in edit mode.
                    IMP-90 u12: image-zone-mode-only ??text / structure 紐⑤뱶??
                    zone drag ????(editGates.zoneGestures = false ??紐⑤뱶 紐⑤몢). */}
                {editGates.zoneGestures && !isPendingLayout && onZoneResize && (
                  <>
                    <div
                      onMouseDown={handleZoneMouseDown}
                      onClick={(ev) => ev.stopPropagation()}
                      className="absolute top-0 left-0 right-0 h-2 cursor-grab active:cursor-grabbing hover:bg-emerald-500/20 transition"
                      style={{ pointerEvents: "auto", zIndex: 25 }}
                      title="Move zone"
                    />
                    <div
                      onMouseDown={handleZoneMouseDown}
                      onClick={(ev) => ev.stopPropagation()}
                      className="absolute bottom-0 left-0 right-0 h-2 cursor-grab active:cursor-grabbing hover:bg-emerald-500/20 transition"
                      style={{ pointerEvents: "auto", zIndex: 25 }}
                      title="Move zone"
                    />
                    <div
                      onMouseDown={handleZoneMouseDown}
                      onClick={(ev) => ev.stopPropagation()}
                      className="absolute top-0 left-0 bottom-0 w-2 cursor-grab active:cursor-grabbing hover:bg-emerald-500/20 transition"
                      style={{ pointerEvents: "auto", zIndex: 25 }}
                      title="Move zone"
                    />
                    <div
                      onMouseDown={handleZoneMouseDown}
                      onClick={(ev) => ev.stopPropagation()}
                      className="absolute top-0 right-0 bottom-0 w-2 cursor-grab active:cursor-grabbing hover:bg-emerald-500/20 transition"
                      style={{ pointerEvents: "auto", zIndex: 25 }}
                      title="Move zone"
                    />
                    {/* visible grip affordance ??placed below the section label
                        (top-1 left-1 container) so the two don't overlap. */}
                    <div
                      onMouseDown={handleZoneMouseDown}
                      onClick={(ev) => ev.stopPropagation()}
                      className="absolute top-7 left-1 w-3 h-3 bg-emerald-500/70 border border-emerald-700 rounded-full cursor-grab active:cursor-grabbing shadow hover:scale-125 transition"
                      style={{ pointerEvents: "auto", zIndex: 25 }}
                      title="Drag to move zone"
                    />
                  </>
                )}
              </div>
            );
          })}

          {/* IMP-90 (#90) u14 ??structure edit overlay (slot reorder +
              hide). Renders only in `editMode === "structure"` over each
              measured zone, positioned at the zone's top-right inside the
              slide-absolute coord space. Slot keys come from u14 iframe
              traversal (`slotKeysByZone`). Mutations emit through
              onStructureEdit; u15 will debounce + PUT. */}
          {!isPendingLayout && editMode === "structure" && finalHtmlUrl &&
            slidePlan?.zones.map((zone) => {
              const m = measuredZones[zone.zone_id];
              if (!m) return null;
              const slotKeys = slotKeysByZone[zone.zone_id] ?? [];
              const current = structureOverrides?.[zone.zone_id];
              return (
                <div
                  key={`struct-${zone.id}`}
                  className="absolute z-30"
                  style={{
                    left: m.x * W_SCALED,
                    top: m.y * H_SCALED,
                    width: m.w * W_SCALED,
                    pointerEvents: "none",
                  }}
                >
                  <StructureEditOverlay
                    zoneId={zone.zone_id}
                    slotKeys={slotKeys}
                    current={current}
                    onChange={onStructureEdit}
                  />
                </div>
              );
            })}

          {/* ?€?€ IMP-51 (#79) u8 ??user-content image edit overlay ?€?€
            Activates only in edit mode when an image_id appears in either
            `imageOverrides` (u11-fed persisted axis) or `measuredImages`
            (iframe-measured baseline). pendingLayout suppresses the image
            overlay so zone editing and image editing never compete for the
            same pointer events.

            For every stamped user-content image we render a transparent
            wrapper at the image's slide-absolute coords. Wrapper picks up
            the body-drag gesture (move the image without resizing). When
            the image is the `selectedImageId` we additionally render 8
            resize handles. Aspect ratio is LOCKED on corner drags by
            default; holding Shift during the drag unlocks it (matches the
            issue contract "corner_resize_ratio_default_locked_shift_unlock").

            Coordinate space: slide-absolute percent (0??00) throughout ??
            measured / persisted / emitted values share the same units as
            the u7 CSS injector (`left/top/width/height: {value}%`) and the
            u3 typed-client `ImageOverride` contract. CSS values are
            written verbatim ({geom.x}%, no scale factor) and pixel deltas
            from MouseEvent are converted to percent via
            `(dx_px / W_SCALED) * 100` so the round-trip drag ??save ??
            re-render produces identical geometry. IMP-51 (#79) u9 moved
            the resize / move math to `clampImagePercentGeometry` in
            `slideCanvasDragMath.ts` so the boundary contract Codex #16
            verified is exercised directly by vitest (mirror of how IMP-54
            u3 split the zone math out of SlideCanvas). */}
          {/* IMP-90 u12: image overlay is image-zone-mode-only. text /
              structure 紐⑤뱶?먯꽌??image drag/resize affordance 誘몃끂異?
              (editGates.imageOverlay = false). pendingLayout ???숈씪?섍쾶
              suppress (computeEditModeGates 媛€ 紐⑤몢 false 諛섑솚). */}
          {!isPendingLayout && editGates.imageOverlay && finalHtmlUrl && onImageResize &&
            Object.entries({ ...measuredImages, ...(imageOverrides ?? {}) }).map(
              ([imageId]) => {
                const persisted = imageOverrides?.[imageId];
                const measured = measuredImages[imageId];
                // override ?곗꽑; ?놁쑝硫?measured baseline. ?????놁쑝硫?skip.
                const geom = persisted ?? measured;
                if (!geom) return null;
                const isSelected = selectedImageId === imageId;

                const beginDrag = (
                  ev: React.MouseEvent<HTMLDivElement>,
                  direction: ImageDragDirection
                ) => {
                  ev.preventDefault();
                  ev.stopPropagation();
                  setSelectedImageId(imageId);
                  const startMouseX = ev.clientX;
                  const startMouseY = ev.clientY;
                  const startGeom = { ...geom };

                  // 2026-05-22 demo hot-fix parity ??iframe ??留덉슦??媛€濡?
                  // 梨꾩꽌 mouseup leak ?쇱뼱??(?몄쭛 紐⑤뱶?먯꽌 pe=auto).
                  const iframeEl = iframeRef.current;
                  const prevIframePE = iframeEl ? iframeEl.style.pointerEvents : "";
                  if (iframeEl) iframeEl.style.pointerEvents = "none";

                  const isCorner =
                    direction === "nw" ||
                    direction === "ne" ||
                    direction === "sw" ||
                    direction === "se";

                  const onMove = (mv: MouseEvent) => {
                    // Convert pixel delta on the on-screen scaled slide
                    // back into percent-of-slide so all downstream math
                    // shares the persisted axis's coord space. W_SCALED /
                    // H_SCALED already include the wrapper scale factor,
                    // so dividing then multiplying by 100 gives a stable
                    // value regardless of viewport zoom.
                    const dx = ((mv.clientX - startMouseX) / W_SCALED) * 100;
                    const dy = ((mv.clientY - startMouseY) / H_SCALED) * 100;
                    // IMP-51 (#79) u9 ??boundary contract lives in the
                    // pure helper so vitest can verify it directly.
                    // Aspect lock is default on for corner handles and
                    // released when Shift is held.
                    const aspectLocked = isCorner && !mv.shiftKey;
                    const next = clampImagePercentGeometry(
                      startGeom,
                      dx,
                      dy,
                      direction,
                      aspectLocked,
                      IMAGE_RESIZE_MIN_SIZE_PERCENT,
                    );
                    onImageResize(imageId, next);
                  };
                  const onUp = () => {
                    document.removeEventListener("mousemove", onMove);
                    document.removeEventListener("mouseup", onUp);
                    if (iframeEl) iframeEl.style.pointerEvents = prevIframePE;
                  };
                  document.addEventListener("mousemove", onMove);
                  document.addEventListener("mouseup", onUp);
                };

                return (
                  <div
                    key={`img-overlay-${imageId}`}
                    role="button"
                    tabIndex={0}
                    data-image-overlay-id={imageId}
                    onMouseDown={(ev) => beginDrag(ev, "move")}
                    className={`absolute z-30 ${
                      isSelected
                        ? "border-2 border-emerald-500 bg-emerald-500/5 shadow-[0_0_0_2px_rgba(16,185,129,0.25)]"
                        : "border border-dashed border-emerald-400/60 hover:border-emerald-500"
                    } cursor-grab active:cursor-grabbing`}
                    style={{
                      left: `${geom.x}%`,
                      top: `${geom.y}%`,
                      width: `${geom.w}%`,
                      height: `${geom.h}%`,
                      pointerEvents: "auto",
                    }}
                    title={
                      isSelected
                        ? "?대?吏€ ?대룞 ???쒕옒洹?/ 紐⑥꽌由??몃뱾 = ?ш린 (Shift = 鍮꾩쑉 ?댁젣)"
                        : "?대┃?섏뿬 ?좏깮"
                    }
                  >
                    <span className="absolute top-1 left-1 text-[9px] font-black uppercase tracking-tighter px-1.5 py-0.5 rounded bg-emerald-600/90 text-white shadow pointer-events-none">
                      IMG
                    </span>

                    {isSelected && (
                      <>
                        {/* edges */}
                        <div
                          onMouseDown={(ev) => beginDrag(ev, "top")}
                          onClick={(ev) => ev.stopPropagation()}
                          className="absolute -top-1 left-1/4 w-1/2 h-2 bg-emerald-500/70 hover:bg-emerald-500 rounded cursor-ns-resize z-40 transition shadow"
                          style={{ pointerEvents: "auto" }}
                          title="?곷떒"
                        />
                        <div
                          onMouseDown={(ev) => beginDrag(ev, "bottom")}
                          onClick={(ev) => ev.stopPropagation()}
                          className="absolute -bottom-1 left-1/4 w-1/2 h-2 bg-emerald-500/70 hover:bg-emerald-500 rounded cursor-ns-resize z-40 transition shadow"
                          style={{ pointerEvents: "auto" }}
                          title="?섎떒"
                        />
                        <div
                          onMouseDown={(ev) => beginDrag(ev, "left")}
                          onClick={(ev) => ev.stopPropagation()}
                          className="absolute top-1/4 -left-1 h-1/2 w-2 bg-emerald-500/70 hover:bg-emerald-500 rounded cursor-ew-resize z-40 transition shadow"
                          style={{ pointerEvents: "auto" }}
                          title="醫뚯륫"
                        />
                        <div
                          onMouseDown={(ev) => beginDrag(ev, "right")}
                          onClick={(ev) => ev.stopPropagation()}
                          className="absolute top-1/4 -right-1 h-1/2 w-2 bg-emerald-500/70 hover:bg-emerald-500 rounded cursor-ew-resize z-40 transition shadow"
                          style={{ pointerEvents: "auto" }}
                          title="?곗륫"
                        />
                        {/* corners ??aspect locked by default, Shift unlocks */}
                        <div
                          onMouseDown={(ev) => beginDrag(ev, "nw")}
                          onClick={(ev) => ev.stopPropagation()}
                          className="absolute -top-1 -left-1 w-3 h-3 bg-white border-2 border-emerald-500 rounded-sm cursor-nwse-resize z-40 hover:scale-125 transition shadow"
                          style={{ pointerEvents: "auto" }}
                          title="醫뚯긽??(Shift = 鍮꾩쑉 ?댁젣)"
                        />
                        <div
                          onMouseDown={(ev) => beginDrag(ev, "ne")}
                          onClick={(ev) => ev.stopPropagation()}
                          className="absolute -top-1 -right-1 w-3 h-3 bg-white border-2 border-emerald-500 rounded-sm cursor-nesw-resize z-40 hover:scale-125 transition shadow"
                          style={{ pointerEvents: "auto" }}
                          title="?곗긽??(Shift = 鍮꾩쑉 ?댁젣)"
                        />
                        <div
                          onMouseDown={(ev) => beginDrag(ev, "sw")}
                          onClick={(ev) => ev.stopPropagation()}
                          className="absolute -bottom-1 -left-1 w-3 h-3 bg-white border-2 border-emerald-500 rounded-sm cursor-nesw-resize z-40 hover:scale-125 transition shadow"
                          style={{ pointerEvents: "auto" }}
                          title="醫뚰븯??(Shift = 鍮꾩쑉 ?댁젣)"
                        />
                        <div
                          onMouseDown={(ev) => beginDrag(ev, "se")}
                          onClick={(ev) => ev.stopPropagation()}
                          className="absolute -bottom-1 -right-1 w-4 h-4 bg-white border-2 border-emerald-500 rounded-sm cursor-nwse-resize z-40 hover:scale-125 transition shadow"
                          style={{ pointerEvents: "auto" }}
                          title="?고븯??(Shift = 鍮꾩쑉 ?댁젣)"
                        />
                      </>
                    )}
                  </div>
                );
              }
            )}
        </div>
      )}
    </div>
  );
}