feat: ✨ lazily-loaded Gerber viewer demo in the blog, served from R2

Embed KiCad's gerbview WASM in the graphics-to-WebGL blog post as a
click-to-load demo that opens the tiny_tapeout board entirely in-browser.

- GerberDemo.astro: lazy iframe embed + cross-origin-isolation reload guard
  + WebGL2/SharedArrayBuffer feature-detect with a poster fallback
- public/gerber-demo/{index.html,boot.js}: self-contained gerbview boot
  harness (config seed, MEMFS board preload, argv auto-open)
- board/ tiny_tapeout layers + poster.png committed; wasm/ glue JS committed
  (served same-origin — pthread worker can't be cross-origin), while
  gerbview.wasm + kicad-resources.bin are git-ignored and served from
  Cloudflare R2 (assets.pcbjam.com)
- COOP/COEP require-corp scoped to the post + /gerber-demo routes
  (dev: astro.config.mjs + middleware.ts; prod: vercel.json)
- post converted to MDX (@astrojs/mdx) so it can embed the component
- scripts/: sync-demo-wasm.sh, r2-deploy.sh, r2-cors.json

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

site/public/gerber-demo/README.md

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+# Gerber viewer blog demo
+
+KiCad's `gerbview` compiled to WebAssembly, embedded (lazily) in the blog post.
+Click → it streams the WASM and renders the bundled tiny_tapeout board in-browser.
+
+## Files here (`site/public/gerber-demo/`)
+
+| Path | What it does |
+|------|--------------|
+| `index.html` | The iframe target — minimal page with the `#main-window` / `#window-container` the WASM needs. |
+| `boot.js` | Boot harness: configures Emscripten `Module`, seeds KiCad config, preloads the board into MEMFS, auto-opens it via `Module.arguments`, and injects `wx.js → wx-dom.js → gerbview.js`. Holds `R2_BASE` + the dev/prod asset-base switch. |
+| `board/` | The tiny_tapeout Gerber layers (committed) the demo opens. |
+| `poster.png` | Static fallback shown to browsers that can't run the live viewer. |
+| `wasm/` | `wx.js`/`wx-dom.js`/`gerbview.js` (committed, served same-origin) + `gerbview.wasm`/`kicad-resources.bin` (git-ignored; served from R2 in prod, local in dev). Synced from `/output`. |
+
+## Related pieces (elsewhere in `site/`)
+
+| Path | What it does |
+|------|--------------|
+| `src/components/GerberDemo.astro` | The embed: lazy click-to-load iframe, cross-origin-isolation reload guard, feature-detect + poster fallback. |
+| `src/content/blog/porting-kicad-graphics-to-webgl-with-claude.mdx` | The post that renders `<GerberDemo />`. |
+| `astro.config.mjs` + `src/middleware.ts` | Dev cross-origin-isolation headers (COOP/COEP `require-corp`). |
+| `vercel.json` | Prod COOP/COEP, scoped to the post + `/gerber-demo/` routes. |
+| `scripts/sync-demo-wasm.sh` | Copy fresh WASM from `/output` into `wasm/` (run after a gerbview rebuild). |
+| `scripts/r2-deploy.sh` + `scripts/r2-cors.json` | Upload the heavy binaries to Cloudflare R2 (`pcbjam-assets` → `assets.pcbjam.com`) and set CORS. |
+
+## Run / update
+
+```bash
+# local dev (serves wasm/ from the local mirror)
+scripts/sync-demo-wasm.sh && npm run dev   # /blog/porting-kicad-graphics-to-webgl-with-claude
+
+# after a new gerbview build: refresh local mirror, then push binaries to R2
+scripts/sync-demo-wasm.sh && scripts/r2-deploy.sh
+```
+
+The live viewer needs SharedArrayBuffer + WebGL2 (Chrome/Edge/Firefox, Safari 15.2+);
+other browsers get `poster.png`.

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site/public/gerber-demo/board/tinytapeout-demo-job.gbrjob

@@ -0,0 +1,209 @@
+{
+  "Header": {
+    "GenerationSoftware": {
+      "Vendor": "KiCad",
+      "Application": "Pcbnew",
+      "Version": "7.0.9-7.0.9~ubuntu22.04.1"
+    },
+    "CreationDate": "2023-12-15T15:20:45-05:00"
+  },
+  "GeneralSpecs": {
+    "ProjectId": {
+      "Name": "tinytapeout-demo",
+      "GUID": "74696e79-7461-4706-956f-75742d64656d",
+      "Revision": "0.9.4"
+    },
+    "Size": {
+      "X": 104.6,
+      "Y": 81.1
+    },
+    "LayerNumber": 4,
+    "BoardThickness": 1.5625,
+    "Finish": "None",
+    "ImpedanceControlled": true
+  },
+  "DesignRules": [
+    {
+      "Layers": "Outer",
+      "PadToPad": 0.18,
+      "PadToTrack": 0.18,
+      "TrackToTrack": 0.2,
+      "MinLineWidth": 0.16,
+      "TrackToRegion": 0.25,
+      "RegionToRegion": 0.25
+    },
+    {
+      "Layers": "Inner",
+      "PadToPad": 0.18,
+      "PadToTrack": 0.18,
+      "TrackToTrack": 0.2,
+      "MinLineWidth": 0.23,
+      "TrackToRegion": 0.25,
+      "RegionToRegion": 0.25
+    }
+  ],
+  "FilesAttributes": [
+    {
+      "Path": "tinytapeout-demo-F_Cu.gbr",
+      "FileFunction": "Copper,L1,Top",
+      "FilePolarity": "Positive"
+    },
+    {
+      "Path": "tinytapeout-demo-In1_Cu.gbr",
+      "FileFunction": "Copper,L2,Inr",
+      "FilePolarity": "Positive"
+    },
+    {
+      "Path": "tinytapeout-demo-In2_Cu.gbr",
+      "FileFunction": "Copper,L3,Inr",
+      "FilePolarity": "Positive"
+    },
+    {
+      "Path": "tinytapeout-demo-B_Cu.gbr",
+      "FileFunction": "Copper,L4,Bot",
+      "FilePolarity": "Positive"
+    },
+    {
+      "Path": "tinytapeout-demo-F_Paste.gbr",
+      "FileFunction": "SolderPaste,Top",
+      "FilePolarity": "Positive"
+    },
+    {
+      "Path": "tinytapeout-demo-B_Paste.gbr",
+      "FileFunction": "SolderPaste,Bot",
+      "FilePolarity": "Positive"
+    },
+    {
+      "Path": "tinytapeout-demo-F_Silkscreen.gbr",
+      "FileFunction": "Legend,Top",
+      "FilePolarity": "Positive"
+    },
+    {
+      "Path": "tinytapeout-demo-B_Silkscreen.gbr",
+      "FileFunction": "Legend,Bot",
+      "FilePolarity": "Positive"
+    },
+    {
+      "Path": "tinytapeout-demo-F_Mask.gbr",
+      "FileFunction": "SolderMask,Top",
+      "FilePolarity": "Negative"
+    },
+    {
+      "Path": "tinytapeout-demo-B_Mask.gbr",
+      "FileFunction": "SolderMask,Bot",
+      "FilePolarity": "Negative"
+    },
+    {
+      "Path": "tinytapeout-demo-Edge_Cuts.gbr",
+      "FileFunction": "Profile",
+      "FilePolarity": "Positive"
+    },
+    {
+      "Path": "tinytapeout-demo-User_2.gbr",
+      "FileFunction": "Other,User",
+      "FilePolarity": "Positive"
+    }
+  ],
+  "MaterialStackup": [
+    {
+      "Type": "Legend",
+      "Color": "White",
+      "Name": "Top Silk Screen"
+    },
+    {
+      "Type": "SolderPaste",
+      "Name": "Top Solder Paste"
+    },
+    {
+      "Type": "SolderMask",
+      "Color": "Green",
+      "Thickness": 0.01,
+      "Name": "Top Solder Mask"
+    },
+    {
+      "Type": "Copper",
+      "Thickness": 0.035,
+      "Name": "F.Cu"
+    },
+    {
+      "Type": "Dielectric",
+      "Color": "R109G116B75",
+      "Thickness": 0.0681,
+      "Material": "R-1551(W)",
+      "DielectricConstant": "4.3",
+      "LossTangent": "0.02",
+      "Name": "F.Cu/In1.Cu (1/2)",
+      "Notes": "Type: dielectric layer 1 - 1/2 (from F.Cu to In1.Cu)"
+    },
+    {
+      "Type": "Dielectric",
+      "Color": "R109G116B75",
+      "Thickness": 0.0681,
+      "Material": "R-1551(W)",
+      "DielectricConstant": "4.3",
+      "LossTangent": "0.02",
+      "Name": "F.Cu/In1.Cu (2/2)",
+      "Notes": "Type: dielectric layer 1 - 2/2 (from F.Cu to In1.Cu)"
+    },
+    {
+      "Type": "Copper",
+      "Thickness": 0.035,
+      "Name": "In1.Cu"
+    },
+    {
+      "Type": "Dielectric",
+      "Color": "R109G116B75",
+      "Thickness": 1.13,
+      "Material": "R-1566(W)",
+      "DielectricConstant": "4.6",
+      "LossTangent": "0.02",
+      "Name": "In1.Cu/In2.Cu",
+      "Notes": "Type: dielectric layer 2 (from In1.Cu to In2.Cu)"
+    },
+    {
+      "Type": "Copper",
+      "Thickness": 0.035,
+      "Name": "In2.Cu"
+    },
+    {
+      "Type": "Dielectric",
+      "Color": "R109G116B75",
+      "Thickness": 0.0681,
+      "Material": "R-1551(W)",
+      "DielectricConstant": "4.3",
+      "LossTangent": "0.02",
+      "Name": "In2.Cu/B.Cu (1/2)",
+      "Notes": "Type: dielectric layer 3 - 1/2 (from In2.Cu to B.Cu)"
+    },
+    {
+      "Type": "Dielectric",
+      "Color": "R109G116B75",
+      "Thickness": 0.0681,
+      "Material": "R-1551(W)",
+      "DielectricConstant": "4.3",
+      "LossTangent": "0.02",
+      "Name": "In2.Cu/B.Cu (2/2)",
+      "Notes": "Type: dielectric layer 3 - 2/2 (from In2.Cu to B.Cu)"
+    },
+    {
+      "Type": "Copper",
+      "Thickness": 0.035,
+      "Name": "B.Cu"
+    },
+    {
+      "Type": "SolderMask",
+      "Color": "Green",
+      "Thickness": 0.01,
+      "Name": "Bottom Solder Mask"
+    },
+    {
+      "Type": "SolderPaste",
+      "Name": "Bottom Solder Paste"
+    },
+    {
+      "Type": "Legend",
+      "Color": "White",
+      "Name": "Bottom Silk Screen"
+    }
+  ]
+}

site/public/gerber-demo/boot.js

@@ -0,0 +1,314 @@
+/*
+ * Self-contained boot harness for the KiCad Gerber viewer (gerbview) WASM,
+ * embedded in the blog post via an <iframe>. Adapted from the proven test
+ * harness (tests/apps/kicad/gerbview.html) and the React port
+ * (web/standalone/src/wasm/boot.ts) — same global `Module`, same preRun steps,
+ * same wx.js -> wx-dom.js -> gerbview.js injection order.
+ *
+ * Classic script (NOT a module): the non-modularized WASM glue reads a GLOBAL
+ * `var Module` and a GLOBAL `mainWindow`, and publishes `FS` onto the global
+ * scope. Top-level `var`/`const` here share that global scope.
+ *
+ * Asset layout, split because the pthread worker script MUST be same-origin
+ * (a Worker can't be created from a cross-origin URL). So the small glue stays
+ * on the site origin and only the big binaries move to Cloudflare R2:
+ *   GLUE_BASE   : wx.js, wx-dom.js, gerbview.js, mainScriptUrlOrBlob (same-origin)
+ *   BINARY_BASE : gerbview.wasm, kicad-resources.bin (R2 in prod, local in dev)
+ *
+ * BINARY_BASE auto-switches by hostname: localhost → the local mirror (./wasm),
+ * any other host → R2_BASE below. Override either base with ?glue=/?bin=.
+ * To point at R2, set R2_BASE to your bucket's public URL — either a custom
+ * domain (https://assets.pcbjam.com) or the managed https://<id>.r2.dev URL.
+ */
+
+(function () {
+  "use strict";
+
+  // R2 bucket public URL (no trailing slash). Custom domain for the
+  // pcbjam-assets bucket (the managed URL https://pub-cecc0239e6f74d99ba7d06630bd87c64.r2.dev
+  // also still works).
+  var R2_BASE = "https://assets.pcbjam.com";
+
+  var params = new URLSearchParams(location.search);
+  var isLocal = /^(localhost|127\.0\.0\.1|\[?::1\]?)$/.test(location.hostname);
+  var GLUE_BASE = (params.get("glue") || "./wasm").replace(/\/+$/, "");
+  var BINARY_BASE = (params.get("bin") || (isLocal ? "./wasm" : R2_BASE)).replace(
+    /\/+$/,
+    ""
+  );
+
+  // KiCad paths baked into the WASM build (see web/standalone/src/wasm/constants.ts).
+  var KICAD_VERSION_DIR = "9.99";
+  var KICAD_CONFIG_DIR =
+    "/home/kicad/.config/kicad/kicad/" + KICAD_VERSION_DIR;
+  var RESOURCE_PATH =
+    "/workspace/build-wasm/sysroot/share/kicad/resources";
+
+  // The board to auto-open: all tiny_tapeout layers (bottom→top for a sensible
+  // draw order). The .gbrjob is preloaded too but we open the individual layer
+  // files (gerbview opens gerber/drill files from argv deterministically).
+  var BOARD_DIR = "/home/kicad/demo";
+  var BOARD_FILES = [
+    "tinytapeout-demo-Edge_Cuts.gbr",
+    "tinytapeout-demo-B_Cu.gbr",
+    "tinytapeout-demo-In2_Cu.gbr",
+    "tinytapeout-demo-In1_Cu.gbr",
+    "tinytapeout-demo-F_Cu.gbr",
+    "tinytapeout-demo-B_Mask.gbr",
+    "tinytapeout-demo-F_Mask.gbr",
+    "tinytapeout-demo-B_Paste.gbr",
+    "tinytapeout-demo-F_Paste.gbr",
+    "tinytapeout-demo-B_Silkscreen.gbr",
+    "tinytapeout-demo-F_Silkscreen.gbr",
+    "tinytapeout-demo-User_2.gbr",
+    "tinytapeout-demo-PTH.drl",
+    "tinytapeout-demo-NPTH.drl",
+    "tinytapeout-demo-job.gbrjob",
+  ];
+  var OPEN_FILES = BOARD_FILES.filter(function (f) {
+    return /\.(gbr|drl)$/.test(f);
+  });
+  var OPEN_ARGS = OPEN_FILES.map(function (f) {
+    return BOARD_DIR + "/" + f;
+  });
+
+  // ── Status UI ──────────────────────────────────────────────────────────────
+  var statusText = document.getElementById("status-text");
+  var progressBar = document.getElementById("progress-bar");
+  function setStatusUI(text) {
+    if (statusText) statusText.textContent = text;
+    var m = /(\d+)\/(\d+)/.exec(text || "");
+    if (m && progressBar) {
+      progressBar.style.width =
+        (parseInt(m[1], 10) / parseInt(m[2], 10)) * 100 + "%";
+    }
+  }
+  function hideStatus() {
+    var s = document.getElementById("status");
+    if (s) s.style.display = "none";
+  }
+  function showError(msg) {
+    console.error("[KICAD_ERROR] " + msg);
+    if (statusText) {
+      statusText.textContent = "Error: " + msg;
+      statusText.style.color = "#ff6b6b";
+    }
+  }
+
+  // The WASM reads the top frame geometry from a GLOBAL `mainWindow` element.
+  var mainWindow = document.getElementById("main-window");
+  window.mainWindow = mainWindow;
+
+  // ── Prefetch the heavy, non-wasm assets in parallel with the wasm download ──
+  // images.tar.gz (compiled-in KiCad resources) and the board layers. Both are
+  // ~10x smaller than gerbview.wasm, so they land before preRun runs; a run
+  // dependency guards the rare case where the wasm wins the race.
+  var resourceData = null;
+  // Served without a .gz extension on purpose (see sync-demo-wasm.sh) so no
+  // server adds Content-Encoding: gzip. Written into MEMFS as images.tar.gz.
+  fetch(BINARY_BASE + "/kicad-resources.bin")
+    .then(function (r) {
+      if (!r.ok) throw new Error("HTTP " + r.status);
+      return r.arrayBuffer();
+    })
+    .then(function (buf) {
+      resourceData = new Uint8Array(buf);
+      console.log("[KICAD] prefetched images.tar.gz (" + resourceData.length + " bytes)");
+    })
+    .catch(function (err) {
+      console.warn("[KICAD] images.tar.gz prefetch failed:", err.message);
+    });
+
+  var boardData = null; // { name: Uint8Array }
+  var boardPromise = Promise.all(
+    BOARD_FILES.map(function (name) {
+      return fetch("./board/" + name)
+        .then(function (r) {
+          if (!r.ok) throw new Error("HTTP " + r.status + " for " + name);
+          return r.arrayBuffer();
+        })
+        .then(function (buf) {
+          return [name, new Uint8Array(buf)];
+        });
+    })
+  )
+    .then(function (pairs) {
+      boardData = {};
+      pairs.forEach(function (p) {
+        boardData[p[0]] = p[1];
+      });
+      console.log("[KICAD] prefetched " + pairs.length + " board files");
+    })
+    .catch(function (err) {
+      console.error("[KICAD] board prefetch failed:", err.message);
+    });
+
+  // ── preRun steps ────────────────────────────────────────────────────────────
+  function createCanvas() {
+    var canvas = document.createElement("canvas");
+    canvas.id = "canvas";
+    canvas.style.display = "none";
+    canvas.style.width = window.innerWidth + "px";
+    canvas.style.height = window.innerHeight + "px";
+    canvas.oncontextmenu = function (e) {
+      e.preventDefault();
+    };
+    canvas.addEventListener(
+      "webglcontextlost",
+      function (e) {
+        showError("WebGL context lost — reload to retry.");
+        e.preventDefault();
+      },
+      false
+    );
+    mainWindow.appendChild(canvas);
+    Module.canvas = canvas;
+    console.log("[KICAD] canvas " + window.innerWidth + "x" + window.innerHeight);
+  }
+
+  function writeResources() {
+    FS.mkdirTree(RESOURCE_PATH);
+    if (resourceData) {
+      FS.writeFile(RESOURCE_PATH + "/images.tar.gz", resourceData);
+      console.log("[KICAD] wrote images.tar.gz");
+    } else {
+      console.warn("[KICAD] images.tar.gz not ready at preRun");
+    }
+  }
+
+  // Suppress the first-run setup wizard (its modal loop crashes Asyncify on our
+  // ephemeral MEMFS): make every settings provider report NeedsUserInput()==false.
+  function seedKicadConfig() {
+    FS.mkdirTree(KICAD_CONFIG_DIR);
+    var seed = function (path, contents) {
+      if (FS.analyzePath(path).exists) return;
+      FS.writeFile(path, contents);
+    };
+    seed(
+      KICAD_CONFIG_DIR + "/kicad_common.json",
+      JSON.stringify(
+        {
+          do_not_show_again: {
+            update_check_prompt: true,
+            data_collection_prompt: true,
+          },
+        },
+        null,
+        2
+      )
+    );
+    seed(KICAD_CONFIG_DIR + "/sym-lib-table", "(sym_lib_table\n  (version 7)\n)\n");
+    seed(KICAD_CONFIG_DIR + "/fp-lib-table", "(fp_lib_table\n  (version 7)\n)\n");
+    seed(
+      KICAD_CONFIG_DIR + "/design-block-lib-table",
+      "(design_block_lib_table\n  (version 7)\n)\n"
+    );
+    console.log("[KICAD] seeded config (wizard suppressed)");
+  }
+
+  // Write the board into MEMFS and point argv at it so gerbview auto-opens it.
+  // argv must be set before main(); a run dependency keeps main() waiting if the
+  // board fetch hasn't landed yet.
+  function preloadBoard() {
+    Module.arguments = OPEN_ARGS;
+    var writeBoard = function () {
+      if (!boardData) return;
+      FS.mkdirTree(BOARD_DIR);
+      Object.keys(boardData).forEach(function (name) {
+        FS.writeFile(BOARD_DIR + "/" + name, boardData[name]);
+      });
+      console.log("[KICAD] wrote board into " + BOARD_DIR + "; argv=" + OPEN_ARGS.length + " files");
+    };
+    if (boardData) {
+      writeBoard();
+      return;
+    }
+    var add = window.addRunDependency;
+    var rm = window.removeRunDependency;
+    if (typeof add === "function" && typeof rm === "function") {
+      add("board-files");
+      boardPromise.then(function () {
+        writeBoard();
+        rm("board-files");
+      });
+    } else {
+      // Best-effort fallback (board << wasm, so this path is unlikely to lose).
+      boardPromise.then(writeBoard);
+    }
+  }
+
+  // ── Module config (global) ───────────────────────────────────────────────────
+  var Module = {
+    thisProgram: "/usr/bin/gerbview", // argv[0] for KiCad's DEBUG check
+    arguments: OPEN_ARGS,
+    preRun: [createCanvas, writeResources, seedKicadConfig, preloadBoard],
+    postRun: [],
+    print: function () {
+      console.log("[KICAD_OUT] " + Array.prototype.join.call(arguments, " "));
+    },
+    printErr: function () {
+      console.error("[KICAD_ERR] " + Array.prototype.join.call(arguments, " "));
+    },
+    setStatus: function (text) {
+      if (text) console.log("[KICAD_STATUS] " + text);
+      setStatusUI(text);
+    },
+    totalDependencies: 0,
+    monitorRunDependencies: function (left) {
+      this.totalDependencies = Math.max(this.totalDependencies, left);
+      Module.setStatus(
+        left
+          ? "Preparing… (" + (this.totalDependencies - left) + "/" + this.totalDependencies + ")"
+          : "All downloads complete."
+      );
+    },
+    onRuntimeInitialized: function () {
+      console.log("[KICAD] runtime initialized");
+      if (Module.canvas) Module.canvas.style.display = "block";
+      hideStatus();
+    },
+    onAbort: function (what) {
+      showError("aborted: " + (what === undefined ? "" : String(what)));
+    },
+    // Route the .wasm to BINARY_BASE; everything else (the pthread worker) to GLUE_BASE.
+    locateFile: function (path) {
+      return (/\.wasm$/.test(path) ? BINARY_BASE : GLUE_BASE) + "/" + path;
+    },
+    // Pin the pthread worker to the same-origin glue (workers cannot be cross-origin).
+    mainScriptUrlOrBlob: GLUE_BASE + "/gerbview.js",
+  };
+  window.Module = Module;
+
+  Module.setStatus("Downloading…");
+  window.onerror = function (msg, url, line) {
+    showError(msg + " @ " + url + ":" + line);
+    return false;
+  };
+
+  // ── Inject glue scripts in the required order ────────────────────────────────
+  function loadScript(src) {
+    return new Promise(function (resolve, reject) {
+      var s = document.createElement("script");
+      s.src = src;
+      s.onload = resolve;
+      s.onerror = function () {
+        reject(new Error("failed to load " + src));
+      };
+      document.body.appendChild(s);
+    });
+  }
+
+  loadScript(GLUE_BASE + "/wx.js")
+    .then(function () {
+      return loadScript(GLUE_BASE + "/wx-dom.js");
+    })
+    .then(function () {
+      return loadScript(GLUE_BASE + "/gerbview.js");
+    })
+    .then(function () {
+      console.log("[KICAD] injected wx.js + wx-dom.js + gerbview.js (glue=" + GLUE_BASE + ", bin=" + BINARY_BASE + ")");
+    })
+    .catch(function (err) {
+      showError(err.message);
+    });
+})();

site/public/gerber-demo/index.html

@@ -0,0 +1,89 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <title>PCBJam — Gerber viewer demo</title>
+    <style>
+      html,
+      body {
+        margin: 0;
+        padding: 0;
+        width: 100%;
+        height: 100%;
+        overflow: hidden;
+        background: #0b1020;
+      }
+      /* The canvas must have no border/padding or mouse coords go wrong. */
+      .emscripten {
+        padding-right: 0;
+        margin-left: auto;
+        margin-right: auto;
+        display: block;
+      }
+      div.emscripten {
+        text-align: center;
+      }
+      canvas.emscripten {
+        border: 0px none;
+      }
+      /* wxWidgets-DOM per-window overlays (created by wx.js, appended to
+         #window-container). Mirror the proven harness exactly. */
+      .window {
+        position: absolute;
+        pointer-events: none;
+        z-index: 10;
+        background-color: black;
+        overflow: hidden;
+        width: 0;
+        height: 0;
+      }
+      .window-canvas {
+        position: absolute;
+        top: 0;
+        left: 0;
+        pointer-events: none;
+      }
+      #status {
+        position: fixed;
+        left: 12px;
+        bottom: 12px;
+        z-index: 1000;
+        font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
+        font-size: 12px;
+        color: #e7ecf5;
+        background: rgba(11, 16, 32, 0.85);
+        border: 1px solid #233052;
+        padding: 8px 10px;
+        border-radius: 8px;
+      }
+      #progress {
+        width: 240px;
+        height: 6px;
+        margin-top: 6px;
+        background: #233052;
+        border-radius: 3px;
+        overflow: hidden;
+      }
+      #progress-bar {
+        height: 100%;
+        width: 0%;
+        background: #4f7cff;
+        transition: width 0.25s;
+      }
+    </style>
+  </head>
+  <body>
+    <div
+      id="main-window"
+      style="width: 100vw; height: 100vh; position: absolute; top: 0; left: 0"
+    ></div>
+    <div id="window-container"></div>
+    <div id="status">
+      <div id="status-text">Initializing…</div>
+      <div id="progress"><div id="progress-bar"></div></div>
+    </div>
+    <!-- Classic script (not a module): the WASM glue needs global Module / mainWindow / FS. -->
+    <script src="./boot.js"></script>
+  </body>
+</html>