diff --git a/ts/index.html b/ts/index.html
index 0ed9c06..9a3bb41 100644
--- a/ts/index.html
+++ b/ts/index.html
@@ -95,7 +95,6 @@
   </div>
 
   <script src="./public/mono-display.js"></script>
-  <script src="./public/web.js"></script>
 </body>
 
 </html>
diff --git a/ts/package.json b/ts/package.json
index dc17b66..1b8399c 100644
--- a/ts/package.json
+++ b/ts/package.json
@@ -3,9 +3,7 @@
   "module": "src/index.ts",
   "type": "module",
   "scripts": {
-    "build_monoformat": "bun build src/browser.ts --target browser --outfile public/mono-display.js",
-    "build_web": "bun build src/web.ts --target browser --outfile public/web.js",
-    "build": "bun build_monoformat && bun build_web",
+    "build": "bun build src/browser.ts --target browser --outfile public/mono-display.js",
     "test": "bun test"
   },
   "devDependencies": {
diff --git a/ts/src/browser.ts b/ts/src/browser.ts
index 51ee591..22f5c8a 100644
--- a/ts/src/browser.ts
+++ b/ts/src/browser.ts
@@ -1,9 +1,500 @@
-// browser.ts — IIFE-style browser entry point
-// Built by:  bun build src/browser.ts --target browser --outfile public/mono-display.js
-// Attaches everything to window.MonoDisplay so inline <script> tags can use it
-// without ES module syntax.
+import { cycleTheme } from "./themes";
+import type { ElementType } from "./types";
 
-import * as MonoDisplay from "./index";
+const W = 120, H = 60;
+let file = { sections: [] as any[] };
+let activeSec = null, activeEl = null;
+let secCounter = 0, elCounter = 0;
+let currentFilename = 'untitled';
+let isDirty = false;
 
-// Expose on globalThis (= window in browser, globalThis elsewhere)
-(globalThis as typeof globalThis & { MonoDisplay: typeof MonoDisplay }).MonoDisplay = MonoDisplay;
+// --- Element type definitions ------------------------------------------------
+type ElFieldMeta = { k: string; l: string; t: string; d: any; full?: boolean };
+type ElFlagMeta  = { k: string; l: string };
+const EL_FIELDS: Partial<Record<keyof typeof ElementType, ElFieldMeta[]>> = {
+  Image2D: [
+    { k: 'xOffset', l: 'X offset', t: 'number', d: 0 }, { k: 'yOffset', l: 'Y offset', t: 'number', d: 0 },
+    { k: 'width', l: 'Width', t: 'number', d: W }, { k: 'height', l: 'Height', t: 'number', d: H },
+  ],
+  Animation: [
+    { k: 'xOffset', l: 'X offset', t: 'number', d: 0 }, { k: 'yOffset', l: 'Y offset', t: 'number', d: 0 },
+    { k: 'width', l: 'Width', t: 'number', d: W }, { k: 'height', l: 'Height', t: 'number', d: H },
+    { k: 'updateInterval', l: 'Update interval', t: 'number', d: 12 },
+  ],
+  ClippedText: [
+    { k: 'text', l: 'Text', t: 'text', d: 'Hello, World!', full: true },
+    { k: 'xOffset', l: 'X offset', t: 'number', d: 0 }, { k: 'yOffset', l: 'Y offset', t: 'number', d: 32 },
+    { k: 'width', l: 'Width', t: 'number', d: W }, { k: 'height', l: 'Height', t: 'number', d: 16 },
+  ],
+  HScrollText: [
+    { k: 'text', l: 'Text', t: 'text', d: 'Scrolling text - ', full: true },
+    { k: 'xOffset', l: 'X offset', t: 'number', d: 0 }, { k: 'yOffset', l: 'Y offset', t: 'number', d: 32 },
+    { k: 'width', l: 'Width', t: 'number', d: W }, { k: 'height', l: 'Height', t: 'number', d: 16 },
+    { k: 'scrollSpeed', l: 'Scroll speed', t: 'number', d: 50 },
+  ],
+  CurrentTime: [
+    { k: 'xOffset', l: 'X offset', t: 'number', d: 0 }, { k: 'yOffset', l: 'Y offset', t: 'number', d: 8 },
+    { k: 'width', l: 'Width', t: 'number', d: W }, { k: 'height', l: 'Height', t: 'number', d: 16 },
+    { k: 'utcOffsetMinutes', l: 'UTC offset (min)', t: 'number', d: 0 },
+  ],
+};
+const EL_FLAGS: Partial<Record<keyof typeof ElementType, ElFlagMeta[]>> = {
+  HScrollText: [{ k: 'endless', l: 'Endless' }, { k: 'invertDirection', l: 'Invert direction' }],
+  CurrentTime: [{ k: 'clock12h', l: '12h mode' }, { k: 'showHours', l: 'Show hours' }, { k: 'showSeconds', l: 'Show seconds' }],
+};
+const EL_TYPES = Object.keys(EL_FIELDS);
+
+// --- Confirm dialog -----------------------------------------------------------
+function confirm(msg, buttons) {
+  // buttons: [{label,primary,action}]
+  return new Promise(resolve => {
+    const overlay = document.getElementById('confirm-overlay');
+    document.getElementById('confirm-msg').textContent = msg;
+    const btns = document.getElementById('confirm-btns');
+    btns.innerHTML = '';
+    buttons.forEach(b => {
+      const el = document.createElement('button');
+      el.className = 'cb' + (b.primary ? ' primary' : '');
+      el.textContent = b.label;
+      el.onclick = () => { overlay.classList.remove('show'); resolve(b.action); };
+      btns.appendChild(el);
+    });
+    overlay.classList.add('show');
+  });
+}
+
+// --- Dirty tracking -----------------------------------------------------------
+function markDirty() {
+  isDirty = true;
+  document.getElementById('filename').classList.add('dirty');
+}
+function markClean() {
+  isDirty = false;
+  document.getElementById('filename').classList.remove('dirty');
+}
+async function guardDirty() {
+  if (!isDirty || !file.sections.length) return true;
+  const action = await confirm(
+    'You have unsaved changes. Loading a demo will replace the current editor state.',
+    [{ label: 'Cancel', action: false }, { label: 'Load anyway', primary: true, action: true }]
+  );
+  return action;
+}
+
+// --- Helpers -----------------------------------------------------------------
+function newSec() {
+  secCounter++;
+  return {
+    id: 's' + secCounter, name: 'Section ' + secCounter, open: true,
+    flags: { drawFront: true, clearBuffer: true }, elements: []
+  };
+}
+function newEl(type) {
+  elCounter++;
+  const fields = {};
+  (EL_FIELDS[type] || []).forEach(f => fields[f.k] = f.d);
+  const flags = {};
+  (EL_FLAGS[type] || []).forEach(f => flags[f.k] = false);
+  return { id: 'e' + elCounter, type, fields, flags };
+}
+function getSec(id) { return file.sections.find(s => s.id === id) }
+function getEl(secId, elId) { const s = getSec(secId); return s && s.elements.find(e => e.id === elId) }
+
+// --- Mutations ----------------------------------------------------------------
+function addSection() {
+  const s = newSec(); file.sections.push(s);
+  activeSec = s.id; activeEl = null;
+  markDirty(); render(); triggerPreview();
+}
+function removeSection(id) {
+  file.sections = file.sections.filter(s => s.id !== id);
+  if (activeSec === id) { activeSec = file.sections.length ? file.sections[file.sections.length - 1].id : null; activeEl = null; }
+  markDirty(); render(); triggerPreview();
+}
+function toggleSection(id) {
+  const s = getSec(id); if (!s) return;
+  s.open = !s.open; activeSec = id; render(); updateMeta();
+}
+function setSectionFlag(flag, val) {
+  if (!activeSec) return;
+  const s = getSec(activeSec); if (!s) return;
+  s.flags[flag] = val; markDirty(); triggerPreview();
+}
+function addElement(secId) {
+  const s = getSec(secId); if (!s) return;
+  const el = newEl(EL_TYPES[0]); s.elements.push(el);
+  activeSec = secId; activeEl = { secId, elId: el.id };
+  markDirty(); render(); triggerPreview();
+}
+function removeElement(secId, elId) {
+  const s = getSec(secId); if (!s) return;
+  s.elements = s.elements.filter(e => e.id !== elId);
+  if (activeEl && activeEl.secId === secId && activeEl.elId === elId) activeEl = null;
+  markDirty(); render(); triggerPreview();
+}
+function selectElement(secId, elId) {
+  activeSec = secId;
+  activeEl = activeEl && activeEl.secId === secId && activeEl.elId === elId ? null : { secId, elId };
+  render();
+}
+function changeElType(secId, elId, type) {
+  const el = getEl(secId, elId); if (!el) return;
+  const fresh = newEl(type);
+  el.type = type; el.fields = fresh.fields; el.flags = fresh.flags;
+  markDirty(); render(); triggerPreview();
+}
+function setElField(secId, elId, key, val) {
+  const el = getEl(secId, elId); if (!el) return;
+  el.fields[key] = val; markDirty(); triggerPreview();
+}
+function setElFlag(secId, elId, key, val) {
+  const el = getEl(secId, elId); if (!el) return;
+  el.flags[key] = val; markDirty(); triggerPreview();
+}
+
+// --- Load demo into editor state ---------------------------------------------
+const DEMO_DEFS = [
+  {
+    label: 'Checkerboard', build() {
+      const s = newSec(); s.name = 'Checkerboard';
+      const el = newEl('Image2D');
+      s.elements.push(el);
+      s.flags = { drawFront: true, clearBuffer: false };
+      return [s];
+    }
+  },
+  {
+    label: 'Blink', build() {
+      const s = newSec(); s.name = 'Blink'; s.flags = { drawFront: true, clearBuffer: true };
+      const el = newEl('Animation'); el.fields.updateInterval = 12;
+      s.elements.push(el); return [s];
+    }
+  },
+  {
+    label: 'Text', build() {
+      const s = newSec(); s.name = 'Text'; s.flags = { drawFront: true, clearBuffer: true };
+      const el = newEl('ClippedText'); el.fields.text = 'Hello, World!'; el.fields.yOffset = 32;
+      s.elements.push(el); return [s];
+    }
+  },
+  {
+    label: 'Scrolltext', build() {
+      const s = newSec(); s.name = 'Scrolltext'; s.flags = { drawFront: true, clearBuffer: true };
+      const el = newEl('HScrollText');
+      el.fields.text = 'MONO DISPLAY - scrolling ticker - 🚀 ';
+      el.fields.yOffset = 32; el.fields.scrollSpeed = 50;
+      el.flags.endless = true; el.flags.invertDirection = false;
+      s.elements.push(el); return [s];
+    }
+  },
+  {
+    label: 'Time', build() {
+      const s = newSec(); s.name = 'Time'; s.flags = { drawFront: true, clearBuffer: true };
+      const defs = [
+        { flags: {}, yOffset: 8 }, { flags: { clock12h: true }, xOffset: 40, yOffset: 16 },
+        { flags: { clock12h: true, showHours: true }, yOffset: 24 },
+        { flags: { clock12h: true, showHours: false }, xOffset: 40, yOffset: 32 },
+        { flags: { clock12h: true, showSeconds: true }, xOffset: 120, yOffset: 32 },
+      ];
+      defs.forEach(d => {
+        const el = newEl('CurrentTime');
+        Object.assign(el.fields, { utcOffsetMinutes: 120, xOffset: d.xOffset || 0, yOffset: d.yOffset });
+        el.flags = d.flags; s.elements.push(el);
+      });
+      return [s];
+    }
+  },
+];
+
+// --- Preview via MonoDisplayFile (same as original demos) --------------------
+const DEMO_PREVIEWS = {
+  Checkerboard() {
+    const { MonoDisplayFile, ElementType } = window.MonoDisplay;
+    const pixels = new Uint8Array(W * H);
+    for (let y = 0; y < H; y++)for (let x = 0; x < W; x++)pixels[y * W + x] = (x + y) % 2;
+    return new MonoDisplayFile({
+      width: W, height: H,
+      elements_always: [{ type: ElementType.Image2D, pixels, width: W, height: H }]
+    }).toBuffer();
+  },
+  Blink() {
+    const { MonoDisplayFile, ElementType } = window.MonoDisplay;
+    return new MonoDisplayFile({
+      elements_always: {
+        flags: { drawFront: true, clearBuffer: true },
+        elements: [{
+          type: ElementType.Animation, width: W, height: H, updateInterval: 12,
+          frames: [{ pixels: new Uint8Array(W * H).fill(1) }, { pixels: new Uint8Array(W * H).fill(0) }]
+        }]
+      }
+    }).toBuffer();
+  },
+  Text() {
+    const { MonoDisplayFile, ElementType } = window.MonoDisplay;
+    return new MonoDisplayFile({
+      elements_always: {
+        flags: { drawFront: true, clearBuffer: true },
+        elements: [{ type: ElementType.ClippedText, text: 'Hello, World!', xOffset: 0, yOffset: 32, width: W, height: 16 }]
+      }
+    }).toBuffer();
+  },
+  Scrolltext() {
+    const { MonoDisplayFile, ElementType } = window.MonoDisplay;
+    return new MonoDisplayFile({
+      elements_always: {
+        flags: { drawFront: true, clearBuffer: true },
+        elements: [{
+          type: ElementType.HScrollText, text: 'MONO DISPLAY - scrolling ticker - 🚀 ',
+          xOffset: 0, yOffset: 32, width: W, height: 16, scrollSpeed: 50, flags: { endless: true, invertDirection: false }
+        }]
+      }
+    }).toBuffer();
+  },
+  Time() {
+    const { MonoDisplayFile, ElementType } = window.MonoDisplay;
+    return new MonoDisplayFile({
+      elements_always: {
+        flags: { drawFront: true, clearBuffer: true }, elements: [
+          { flags: {}, type: ElementType.CurrentTime, xOffset: 0, yOffset: 8, width: W, height: 16, utcOffsetMinutes: 120 },
+          { flags: { clock12h: true }, type: ElementType.CurrentTime, xOffset: 40, yOffset: 16, width: W, height: 16, utcOffsetMinutes: 120 },
+          { flags: { clock12h: true, showHours: true }, type: ElementType.CurrentTime, xOffset: 0, yOffset: 24, width: W, height: 16, utcOffsetMinutes: 120 },
+          { flags: { clock12h: true, showHours: false }, type: ElementType.CurrentTime, xOffset: 40, yOffset: 32, width: W, height: 16, utcOffsetMinutes: 120 },
+          { flags: { clock12h: true, showSeconds: true }, type: ElementType.CurrentTime, xOffset: 80, yOffset: 32, width: W, height: 16, utcOffsetMinutes: 120 },
+        ]
+      }
+    }).toBuffer();
+  },
+};
+
+function initDemos() {
+  const wrap = document.getElementById('demo-btns');
+  let activeBtn = null;
+  DEMO_DEFS.forEach(d => {
+    const btn = document.createElement('button');
+    btn.className = 'tb-btn'; btn.textContent = d.label;
+    btn.onclick = async () => {
+      const ok = await guardDirty();
+      if (!ok) return;
+      // load into editor
+      file.sections = d.build();
+      activeSec = file.sections[0]?.id || null; activeEl = null;
+      currentFilename = d.label.toLowerCase();
+      document.getElementById('filename').textContent = currentFilename;
+      markClean(); render();
+      // drive preview with full fidelity build
+      if (!window._mdDriver)
+        window._mdDriver = new window.MonoDisplay.MonoDisplayDriver('canvas_root', { onColor: '#EC0', offColor: '#000', fps: 25 });
+      window._mdDriver.load(() => Promise.resolve(DEMO_PREVIEWS[d.label]()));
+      if (activeBtn) activeBtn.style.color = '';
+      btn.style.color = '#33ff66'; activeBtn = btn;
+    };
+    wrap.appendChild(btn);
+  });
+}
+
+// --- Render -------------------------------------------------------------------
+function render() {
+  updateMeta();
+  const wrap = document.getElementById('sections-wrap');
+  if (!file.sections.length) {
+    wrap.innerHTML = '<div class="empty-state">No sections yet.<br/>Use <b>Add section</b> to get started.</div>';
+    return;
+  }
+  wrap.innerHTML = file.sections.map(s => renderSection(s)).join('');
+}
+
+function renderSection(s) {
+  const isActive = activeSec === s.id, isOpen = s.open;
+  return `
+<div class="sec-card${isActive ? ' active' : ''}${isOpen ? ' open' : ''}" id="sc-${s.id}">
+<div class="sec-hdr${isActive ? ' active' : ''}" onclick="toggleSection('${s.id}')">
+<span class="sec-arrow">▶</span>
+<span class="sec-label">${esc(s.name)}</span>
+<span class="sec-badge">${s.elements.length} el</span>
+<button class="x-btn" title="Remove section" onclick="event.stopPropagation();removeSection('${s.id}')">×</button>
+</div>
+${isOpen ? `
+<div class="el-list">
+${s.elements.map(el => renderElement(s.id, el)).join('')}
+<button class="add-el" onclick="addElement('${s.id}')">+ add element</button>
+</div>`: ''}
+</div>`;
+}
+
+function renderElement(secId, el) {
+  const isActive = activeEl && activeEl.secId === secId && activeEl.elId === el.id;
+  const fields = EL_FIELDS[el.type] || [];
+  const flags = EL_FLAGS[el.type] || [];
+  return `
+<div class="el-item${isActive ? ' active' : ''}" id="eli-${el.id}">
+<div class="el-item-hdr" onclick="selectElement('${secId}','${el.id}')">
+<span class="el-type">${el.type}</span>
+<span class="el-name">${elSummary(el)}</span>
+<button class="x-btn" title="Remove element" onclick="event.stopPropagation();removeElement('${secId}','${el.id}')">×</button>
+</div>
+${isActive ? `
+<div class="el-fields">
+<div class="field full">
+  <label>Type</label>
+  <select onchange="changeElType('${secId}','${el.id}',this.value)">
+    ${EL_TYPES.map(t => `<option value="${t}"${t === el.type ? ' selected' : ''}>${t}</option>`).join('')}
+  </select>
+</div>
+<div class="fields-grid">
+  ${fields.map(f => `
+  <div class="field${f.full ? ' full' : ''}">
+    <label>${f.l}</label>
+    ${f.t === 'text'
+      ? `<textarea onchange="setElField('${secId}','${el.id}','${f.k}',this.value)">${esc(el.fields[f.k] ?? f.d)}</textarea>`
+      : `<input type="number" value="${el.fields[f.k] ?? f.d}" onchange="setElField('${secId}','${el.id}','${f.k}',+this.value)"/>`
+    }
+  </div>`).join('')}
+</div>
+${flags.length ? `
+<div class="field full">
+  <label>Flags</label>
+  <div class="flags-row">
+    ${flags.map(f => `
+    <label class="flag-check">
+      <input type="checkbox" ${el.flags[f.k] ? 'checked' : ''} onchange="setElFlag('${secId}','${el.id}','${f.k}',this.checked)"/>
+      ${f.l}
+    </label>`).join('')}
+  </div>
+</div>`: ''}
+</div>`: ''}
+</div>`;
+}
+
+function elSummary(el) {
+  if (el.fields.text) return esc(el.fields.text.slice(0, 24) + (el.fields.text.length > 24 ? '...' : ''));
+  return `${el.fields.xOffset ?? 0}, ${el.fields.yOffset ?? 0}`;
+}
+function esc(s) { return String(s).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;') }
+
+function updateMeta() {
+  const s = activeSec ? getSec(activeSec) : null;
+  document.getElementById('meta-name').textContent = s ? s.name : '-';
+  document.getElementById('meta-count').textContent = s ? s.elements.length + ' element(s)' : '-';
+  document.getElementById('flag-drawFront').checked = s ? !!s.flags.drawFront : false;
+  document.getElementById('flag-clearBuffer').checked = s ? !!s.flags.clearBuffer : false;
+}
+
+// --- Preview ------------------------------------------------------------------
+let previewTimer = null;
+function triggerPreview() {
+  clearTimeout(previewTimer);
+  previewTimer = setTimeout(() => { try { buildPreview(); } catch (e) { console.warn('preview', e); } }, 150);
+}
+function buildPreview() {
+  if (!window.MonoDisplay) return;
+  const { MonoDisplayDriver, MonoDisplayFile, ElementType } = window.MonoDisplay;
+  if (!window._mdDriver)
+    window._mdDriver = new MonoDisplayDriver('canvas_root', { onColor: '#EC0', offColor: '#000', fps: 25 });
+  const s = activeSec ? getSec(activeSec) : file.sections[0];
+  if (!s || !s.elements.length) {
+    window._mdDriver.load(() => Promise.resolve(new MonoDisplayFile({ elements_always: [] }).toBuffer()));
+    return;
+  }
+  const elDefs = s.elements.map(el => ({ type: ElementType[el.type], ...el.fields, flags: el.flags })).filter(e => e.type != null);
+  window._mdDriver.load(() => Promise.resolve(
+    new MonoDisplayFile({ elements_always: { flags: s.flags, elements: elDefs } }).toBuffer()
+  ));
+}
+
+// --- Load / Export ------------------------------------------------------------
+function parsedToSections(parsedSecs) {
+  const TYPE_MAP = { 1: 'Image2D', 2: 'Animation', 16: 'ClippedText', 17: 'HScrollText', 32: 'CurrentTime' };
+  return parsedSecs
+    .filter(s => s.sectionType === 1 || s.sectionType === 2)
+    .map(s => {
+      secCounter++;
+      const elements = (s.elements || []).map(el => {
+        const typeName = TYPE_MAP[el.type];
+        if (!typeName) return null;
+        elCounter++;
+        let fields = {}, flags = {};
+        switch (typeName) {
+          case 'Image2D':
+            fields = { xOffset: el.xOffset, yOffset: el.yOffset, width: el.image?.width ?? W, height: el.image?.height ?? H, pixels: el.image?.pixels };
+            break;
+          case 'Animation':
+            fields = { xOffset: el.xOffset, yOffset: el.yOffset, width: el.width, height: el.height, updateInterval: el.updateInterval, frames: el.frames };
+            break;
+          case 'ClippedText':
+            fields = { text: el.text, xOffset: el.xOffset, yOffset: el.yOffset, width: el.width, height: el.height };
+            break;
+          case 'HScrollText':
+            fields = { text: el.text, xOffset: el.xOffset, yOffset: el.yOffset, width: el.width, height: el.height, scrollSpeed: el.scrollSpeed };
+            flags = { endless: !!el.flags?.endless, invertDirection: !!el.flags?.invertDirection };
+            break;
+          case 'CurrentTime':
+            fields = { xOffset: el.xOffset, yOffset: el.yOffset, width: el.width, height: el.height, utcOffsetMinutes: el.utcOffsetMinutes };
+            flags = { clock12h: !!el.flags?.clock12h, showHours: !!el.flags?.showHours, showSeconds: !!el.flags?.showSeconds };
+            break;
+        }
+        return { id: 'e' + elCounter, type: typeName, fields, flags };
+      }).filter(Boolean);
+      return {
+        id: 's' + secCounter,
+        name: 'Section ' + secCounter,
+        open: true,
+        flags: { drawFront: !!s.flags?.drawFront, clearBuffer: !!s.flags?.clearBuffer },
+        elements
+      };
+    });
+}
+
+function loadBin(input) {
+  const binFile = input.files[0]; if (!binFile) return;
+  currentFilename = binFile.name;
+  document.getElementById('filename').textContent = binFile.name;
+  const reader = new FileReader();
+  reader.onload = e => {
+    const arrayBuf = e.target.result;
+    const buf = new Uint8Array(arrayBuf);
+    if (!window._mdDriver && window.MonoDisplay)
+      window._mdDriver = new window.MonoDisplay.MonoDisplayDriver('canvas_root', { onColor: '#EC0', offColor: '#000', fps: 25 });
+    if (window._mdDriver) window._mdDriver.load(() => Promise.resolve(buf));
+    try {
+      const parsed = new window.MonoDisplay.MonoDisplayParser().parse(arrayBuf);
+      file.sections = parsedToSections(parsed.sections);
+      activeSec = file.sections.length ? file.sections[0].id : null;
+      activeEl = null;
+      render();
+    } catch (err) {
+      console.warn('Could not parse sections from bin:', err);
+    }
+  };
+  reader.readAsArrayBuffer(binFile);
+  input.value = ''; markClean();
+}
+function exportBin() {
+  if (!window.MonoDisplay) { alert('MonoDisplay library not loaded.'); return; }
+  const { MonoDisplayFile, ElementType } = window.MonoDisplay;
+  const s = activeSec ? getSec(activeSec) : file.sections[0];
+  if (!s) { alert('Nothing to export.'); return; }
+  const elDefs = s.elements.map(el => ({ type: ElementType[el.type], ...el.fields, flags: el.flags })).filter(e => e.type != null);
+  const buf = new MonoDisplayFile({ elements_always: { flags: s.flags, elements: elDefs } }).toBuffer();
+  const blob = new Blob([buf], { type: 'application/octet-stream' });
+  const a = document.createElement('a');
+  a.href = URL.createObjectURL(blob);
+  a.download = currentFilename.replace(/\.bin$/, '') + '.bin';
+  a.click(); markClean();
+}
+
+
+
+// --- Init ---------------------------------------------------------------------
+// Pin all functions referenced from inline HTML onclick/onchange strings so
+// Bun's bundler does not tree-shake them as unreachable dead code.
+Object.assign(window, {
+  loadBin, exportBin,
+  addSection, removeSection, toggleSection, setSectionFlag,
+  addElement, removeElement, selectElement,
+  changeElType, setElField, setElFlag,
+  cycleTheme,
+});
+
+render();
+if (window.MonoDisplay) { initDemos(); }
+else { const iv = setInterval(() => { if (window.MonoDisplay) { clearInterval(iv); initDemos(); } }, 100); }
diff --git a/ts/src/themes.ts b/ts/src/themes.ts
new file mode 100644
index 0000000..b6dab3e
--- /dev/null
+++ b/ts/src/themes.ts
@@ -0,0 +1,26 @@
+// --- Theme --------------------------------------------------------------------
+var _THEMES = ['dark', 'light', 'auto'];
+function _getTheme() { return document.documentElement.getAttribute('data-theme') || 'auto'; }
+function _applyTheme(t: string | undefined) {
+  if (t === 'auto') { document.documentElement.removeAttribute('data-theme'); localStorage.removeItem('theme'); }
+  else { document.documentElement.setAttribute('data-theme', t); localStorage.setItem('theme', t); }
+  _updateThemeBtn();
+}
+export function cycleTheme() {
+  var cur = _getTheme(), idx = _THEMES.indexOf(cur);
+  _applyTheme(_THEMES[(idx + 1) % _THEMES.length]);
+}
+function _detectDR() {
+  return !!(document.querySelector('meta[name="darkreader"]') ||
+    document.querySelector('style[data-darkreader-style]') ||
+    document.documentElement.getAttribute('data-darkreader-mode'));
+}
+function _updateThemeBtn() {
+  var btn = document.getElementById('theme-toggle');
+  if (!btn) return;
+  var t = _getTheme(), dr = _detectDR();
+  var lbl = { dark: '☾ dark', light: '☀ light', auto: '⊙ auto' };
+  btn.textContent = (dr ? 'DR · ' : '') + (lbl[t] || lbl.auto);
+  btn.title = dr ? 'DarkReader active - controlling theme' : ('Theme: ' + t + ' (click to cycle)');
+}
+window.addEventListener('DOMContentLoaded', _updateThemeBtn);
diff --git a/ts/src/web.ts b/ts/src/web.ts
deleted file mode 100644
index a8745c8..0000000
--- a/ts/src/web.ts
+++ /dev/null
@@ -1,522 +0,0 @@
-
-const W = 120, H = 60;
-let sections = [];
-let activeSec = null, activeEl = null;
-let secCounter = 0, elCounter = 0;
-let currentFilename = 'untitled';
-let isDirty = false;
-
-// --- Element type definitions ------------------------------------------------
-const EL_TYPES = ['Image2D', 'Animation', 'ClippedText', 'HScrollText', 'CurrentTime'];
-const EL_FIELDS = {
-  Image2D: [
-    { k: 'xOffset', l: 'X offset', t: 'number', d: 0 }, { k: 'yOffset', l: 'Y offset', t: 'number', d: 0 },
-    { k: 'width', l: 'Width', t: 'number', d: W }, { k: 'height', l: 'Height', t: 'number', d: H },
-  ],
-  Animation: [
-    { k: 'xOffset', l: 'X offset', t: 'number', d: 0 }, { k: 'yOffset', l: 'Y offset', t: 'number', d: 0 },
-    { k: 'width', l: 'Width', t: 'number', d: W }, { k: 'height', l: 'Height', t: 'number', d: H },
-    { k: 'updateInterval', l: 'Update interval', t: 'number', d: 12 },
-  ],
-  ClippedText: [
-    { k: 'text', l: 'Text', t: 'text', d: 'Hello, World!', full: true },
-    { k: 'xOffset', l: 'X offset', t: 'number', d: 0 }, { k: 'yOffset', l: 'Y offset', t: 'number', d: 32 },
-    { k: 'width', l: 'Width', t: 'number', d: W }, { k: 'height', l: 'Height', t: 'number', d: 16 },
-  ],
-  HScrollText: [
-    { k: 'text', l: 'Text', t: 'text', d: 'Scrolling text - ', full: true },
-    { k: 'xOffset', l: 'X offset', t: 'number', d: 0 }, { k: 'yOffset', l: 'Y offset', t: 'number', d: 32 },
-    { k: 'width', l: 'Width', t: 'number', d: W }, { k: 'height', l: 'Height', t: 'number', d: 16 },
-    { k: 'scrollSpeed', l: 'Scroll speed', t: 'number', d: 50 },
-  ],
-  CurrentTime: [
-    { k: 'xOffset', l: 'X offset', t: 'number', d: 0 }, { k: 'yOffset', l: 'Y offset', t: 'number', d: 8 },
-    { k: 'width', l: 'Width', t: 'number', d: W }, { k: 'height', l: 'Height', t: 'number', d: 16 },
-    { k: 'utcOffsetMinutes', l: 'UTC offset (min)', t: 'number', d: 0 },
-  ],
-};
-const EL_FLAGS = {
-  Image2D: [], Animation: [], ClippedText: [],
-  HScrollText: [{ k: 'endless', l: 'Endless' }, { k: 'invertDirection', l: 'Invert direction' }],
-  CurrentTime: [{ k: 'clock12h', l: '12h mode' }, { k: 'showHours', l: 'Show hours' }, { k: 'showSeconds', l: 'Show seconds' }],
-};
-
-// --- Confirm dialog -----------------------------------------------------------
-function confirm(msg, buttons) {
-  // buttons: [{label,primary,action}]
-  return new Promise(resolve => {
-    const overlay = document.getElementById('confirm-overlay');
-    document.getElementById('confirm-msg').textContent = msg;
-    const btns = document.getElementById('confirm-btns');
-    btns.innerHTML = '';
-    buttons.forEach(b => {
-      const el = document.createElement('button');
-      el.className = 'cb' + (b.primary ? ' primary' : '');
-      el.textContent = b.label;
-      el.onclick = () => { overlay.classList.remove('show'); resolve(b.action); };
-      btns.appendChild(el);
-    });
-    overlay.classList.add('show');
-  });
-}
-
-// --- Dirty tracking -----------------------------------------------------------
-function markDirty() {
-  isDirty = true;
-  document.getElementById('filename').classList.add('dirty');
-}
-function markClean() {
-  isDirty = false;
-  document.getElementById('filename').classList.remove('dirty');
-}
-async function guardDirty() {
-  if (!isDirty || !sections.length) return true;
-  const action = await confirm(
-    'You have unsaved changes. Loading a demo will replace the current editor state.',
-    [{ label: 'Cancel', action: false }, { label: 'Load anyway', primary: true, action: true }]
-  );
-  return action;
-}
-
-// --- Helpers -----------------------------------------------------------------
-function newSec() {
-  secCounter++;
-  return {
-    id: 's' + secCounter, name: 'Section ' + secCounter, open: true,
-    flags: { drawFront: true, clearBuffer: true }, elements: []
-  };
-}
-function newEl(type) {
-  elCounter++;
-  const fields = {};
-  (EL_FIELDS[type] || []).forEach(f => fields[f.k] = f.d);
-  const flags = {};
-  (EL_FLAGS[type] || []).forEach(f => flags[f.k] = false);
-  return { id: 'e' + elCounter, type, fields, flags };
-}
-function getSec(id) { return sections.find(s => s.id === id) }
-function getEl(secId, elId) { const s = getSec(secId); return s && s.elements.find(e => e.id === elId) }
-
-// --- Mutations ----------------------------------------------------------------
-function addSection() {
-  const s = newSec(); sections.push(s);
-  activeSec = s.id; activeEl = null;
-  markDirty(); render(); triggerPreview();
-}
-function removeSection(id) {
-  sections = sections.filter(s => s.id !== id);
-  if (activeSec === id) { activeSec = sections.length ? sections[sections.length - 1].id : null; activeEl = null; }
-  markDirty(); render(); triggerPreview();
-}
-function toggleSection(id) {
-  const s = getSec(id); if (!s) return;
-  s.open = !s.open; activeSec = id; render(); updateMeta();
-}
-function setSectionFlag(flag, val) {
-  if (!activeSec) return;
-  const s = getSec(activeSec); if (!s) return;
-  s.flags[flag] = val; markDirty(); triggerPreview();
-}
-function addElement(secId) {
-  const s = getSec(secId); if (!s) return;
-  const el = newEl(EL_TYPES[0]); s.elements.push(el);
-  activeSec = secId; activeEl = { secId, elId: el.id };
-  markDirty(); render(); triggerPreview();
-}
-function removeElement(secId, elId) {
-  const s = getSec(secId); if (!s) return;
-  s.elements = s.elements.filter(e => e.id !== elId);
-  if (activeEl && activeEl.secId === secId && activeEl.elId === elId) activeEl = null;
-  markDirty(); render(); triggerPreview();
-}
-function selectElement(secId, elId) {
-  activeSec = secId;
-  activeEl = activeEl && activeEl.secId === secId && activeEl.elId === elId ? null : { secId, elId };
-  render();
-}
-function changeElType(secId, elId, type) {
-  const el = getEl(secId, elId); if (!el) return;
-  const fresh = newEl(type);
-  el.type = type; el.fields = fresh.fields; el.flags = fresh.flags;
-  markDirty(); render(); triggerPreview();
-}
-function setElField(secId, elId, key, val) {
-  const el = getEl(secId, elId); if (!el) return;
-  el.fields[key] = val; markDirty(); triggerPreview();
-}
-function setElFlag(secId, elId, key, val) {
-  const el = getEl(secId, elId); if (!el) return;
-  el.flags[key] = val; markDirty(); triggerPreview();
-}
-
-// --- Load demo into editor state ---------------------------------------------
-const DEMO_DEFS = [
-  {
-    label: 'Checkerboard', build() {
-      const s = newSec(); s.name = 'Checkerboard';
-      const el = newEl('Image2D');
-      s.elements.push(el);
-      s.flags = { drawFront: true, clearBuffer: false };
-      return [s];
-    }
-  },
-  {
-    label: 'Blink', build() {
-      const s = newSec(); s.name = 'Blink'; s.flags = { drawFront: true, clearBuffer: true };
-      const el = newEl('Animation'); el.fields.updateInterval = 12;
-      s.elements.push(el); return [s];
-    }
-  },
-  {
-    label: 'Text', build() {
-      const s = newSec(); s.name = 'Text'; s.flags = { drawFront: true, clearBuffer: true };
-      const el = newEl('ClippedText'); el.fields.text = 'Hello, World!'; el.fields.yOffset = 32;
-      s.elements.push(el); return [s];
-    }
-  },
-  {
-    label: 'Scrolltext', build() {
-      const s = newSec(); s.name = 'Scrolltext'; s.flags = { drawFront: true, clearBuffer: true };
-      const el = newEl('HScrollText');
-      el.fields.text = 'MONO DISPLAY - scrolling ticker - 🚀 ';
-      el.fields.yOffset = 32; el.fields.scrollSpeed = 50;
-      el.flags.endless = true; el.flags.invertDirection = false;
-      s.elements.push(el); return [s];
-    }
-  },
-  {
-    label: 'Time', build() {
-      const s = newSec(); s.name = 'Time'; s.flags = { drawFront: true, clearBuffer: true };
-      const defs = [
-        { flags: {}, yOffset: 8 }, { flags: { clock12h: true }, xOffset: 40, yOffset: 16 },
-        { flags: { clock12h: true, showHours: true }, yOffset: 24 },
-        { flags: { clock12h: true, showHours: false }, xOffset: 40, yOffset: 32 },
-        { flags: { clock12h: true, showSeconds: true }, xOffset: 120, yOffset: 32 },
-      ];
-      defs.forEach(d => {
-        const el = newEl('CurrentTime');
-        Object.assign(el.fields, { utcOffsetMinutes: 120, xOffset: d.xOffset || 0, yOffset: d.yOffset });
-        el.flags = d.flags; s.elements.push(el);
-      });
-      return [s];
-    }
-  },
-];
-
-// --- Preview via MonoDisplayFile (same as original demos) --------------------
-const DEMO_PREVIEWS = {
-  Checkerboard() {
-    const { MonoDisplayFile, ElementType } = window.MonoDisplay;
-    const pixels = new Uint8Array(W * H);
-    for (let y = 0; y < H; y++)for (let x = 0; x < W; x++)pixels[y * W + x] = (x + y) % 2;
-    return new MonoDisplayFile({
-      width: W, height: H,
-      elements_always: [{ type: ElementType.Image2D, pixels, width: W, height: H }]
-    }).toBuffer();
-  },
-  Blink() {
-    const { MonoDisplayFile, ElementType } = window.MonoDisplay;
-    return new MonoDisplayFile({
-      elements_always: {
-        flags: { drawFront: true, clearBuffer: true },
-        elements: [{
-          type: ElementType.Animation, width: W, height: H, updateInterval: 12,
-          frames: [{ pixels: new Uint8Array(W * H).fill(1) }, { pixels: new Uint8Array(W * H).fill(0) }]
-        }]
-      }
-    }).toBuffer();
-  },
-  Text() {
-    const { MonoDisplayFile, ElementType } = window.MonoDisplay;
-    return new MonoDisplayFile({
-      elements_always: {
-        flags: { drawFront: true, clearBuffer: true },
-        elements: [{ type: ElementType.ClippedText, text: 'Hello, World!', xOffset: 0, yOffset: 32, width: W, height: 16 }]
-      }
-    }).toBuffer();
-  },
-  Scrolltext() {
-    const { MonoDisplayFile, ElementType } = window.MonoDisplay;
-    return new MonoDisplayFile({
-      elements_always: {
-        flags: { drawFront: true, clearBuffer: true },
-        elements: [{
-          type: ElementType.HScrollText, text: 'MONO DISPLAY - scrolling ticker - 🚀 ',
-          xOffset: 0, yOffset: 32, width: W, height: 16, scrollSpeed: 50, flags: { endless: true, invertDirection: false }
-        }]
-      }
-    }).toBuffer();
-  },
-  Time() {
-    const { MonoDisplayFile, ElementType } = window.MonoDisplay;
-    return new MonoDisplayFile({
-      elements_always: {
-        flags: { drawFront: true, clearBuffer: true }, elements: [
-          { flags: {}, type: ElementType.CurrentTime, xOffset: 0, yOffset: 8, width: W, height: 16, utcOffsetMinutes: 120 },
-          { flags: { clock12h: true }, type: ElementType.CurrentTime, xOffset: 40, yOffset: 16, width: W, height: 16, utcOffsetMinutes: 120 },
-          { flags: { clock12h: true, showHours: true }, type: ElementType.CurrentTime, xOffset: 0, yOffset: 24, width: W, height: 16, utcOffsetMinutes: 120 },
-          { flags: { clock12h: true, showHours: false }, type: ElementType.CurrentTime, xOffset: 40, yOffset: 32, width: W, height: 16, utcOffsetMinutes: 120 },
-          { flags: { clock12h: true, showSeconds: true }, type: ElementType.CurrentTime, xOffset: 80, yOffset: 32, width: W, height: 16, utcOffsetMinutes: 120 },
-        ]
-      }
-    }).toBuffer();
-  },
-};
-
-function initDemos() {
-  const wrap = document.getElementById('demo-btns');
-  let activeBtn = null;
-  DEMO_DEFS.forEach(d => {
-    const btn = document.createElement('button');
-    btn.className = 'tb-btn'; btn.textContent = d.label;
-    btn.onclick = async () => {
-      const ok = await guardDirty();
-      if (!ok) return;
-      // load into editor
-      sections = d.build();
-      activeSec = sections[0]?.id || null; activeEl = null;
-      currentFilename = d.label.toLowerCase();
-      document.getElementById('filename').textContent = currentFilename;
-      markClean(); render();
-      // drive preview with full fidelity build
-      if (!window._mdDriver)
-        window._mdDriver = new window.MonoDisplay.MonoDisplayDriver('canvas_root', { onColor: '#EC0', offColor: '#000', fps: 25 });
-      window._mdDriver.load(() => Promise.resolve(DEMO_PREVIEWS[d.label]()));
-      if (activeBtn) activeBtn.style.color = '';
-      btn.style.color = '#33ff66'; activeBtn = btn;
-    };
-    wrap.appendChild(btn);
-  });
-}
-
-// --- Render -------------------------------------------------------------------
-function render() {
-  updateMeta();
-  const wrap = document.getElementById('sections-wrap');
-  if (!sections.length) {
-    wrap.innerHTML = '<div class="empty-state">No sections yet.<br/>Use <b>Add section</b> to get started.</div>';
-    return;
-  }
-  wrap.innerHTML = sections.map(s => renderSection(s)).join('');
-}
-
-function renderSection(s) {
-  const isActive = activeSec === s.id, isOpen = s.open;
-  return `
-<div class="sec-card${isActive ? ' active' : ''}${isOpen ? ' open' : ''}" id="sc-${s.id}">
-<div class="sec-hdr${isActive ? ' active' : ''}" onclick="toggleSection('${s.id}')">
-<span class="sec-arrow">▶</span>
-<span class="sec-label">${esc(s.name)}</span>
-<span class="sec-badge">${s.elements.length} el</span>
-<button class="x-btn" title="Remove section" onclick="event.stopPropagation();removeSection('${s.id}')">×</button>
-</div>
-${isOpen ? `
-<div class="el-list">
-${s.elements.map(el => renderElement(s.id, el)).join('')}
-<button class="add-el" onclick="addElement('${s.id}')">+ add element</button>
-</div>`: ''}
-</div>`;
-}
-
-function renderElement(secId, el) {
-  const isActive = activeEl && activeEl.secId === secId && activeEl.elId === el.id;
-  const fields = EL_FIELDS[el.type] || [];
-  const flags = EL_FLAGS[el.type] || [];
-  return `
-<div class="el-item${isActive ? ' active' : ''}" id="eli-${el.id}">
-<div class="el-item-hdr" onclick="selectElement('${secId}','${el.id}')">
-<span class="el-type">${el.type}</span>
-<span class="el-name">${elSummary(el)}</span>
-<button class="x-btn" title="Remove element" onclick="event.stopPropagation();removeElement('${secId}','${el.id}')">×</button>
-</div>
-${isActive ? `
-<div class="el-fields">
-<div class="field full">
-  <label>Type</label>
-  <select onchange="changeElType('${secId}','${el.id}',this.value)">
-    ${EL_TYPES.map(t => `<option value="${t}"${t === el.type ? ' selected' : ''}>${t}</option>`).join('')}
-  </select>
-</div>
-<div class="fields-grid">
-  ${fields.map(f => `
-  <div class="field${f.full ? ' full' : ''}">
-    <label>${f.l}</label>
-    ${f.t === 'text'
-      ? `<textarea onchange="setElField('${secId}','${el.id}','${f.k}',this.value)">${esc(el.fields[f.k] ?? f.d)}</textarea>`
-      : `<input type="number" value="${el.fields[f.k] ?? f.d}" onchange="setElField('${secId}','${el.id}','${f.k}',+this.value)"/>`
-    }
-  </div>`).join('')}
-</div>
-${flags.length ? `
-<div class="field full">
-  <label>Flags</label>
-  <div class="flags-row">
-    ${flags.map(f => `
-    <label class="flag-check">
-      <input type="checkbox" ${el.flags[f.k] ? 'checked' : ''} onchange="setElFlag('${secId}','${el.id}','${f.k}',this.checked)"/>
-      ${f.l}
-    </label>`).join('')}
-  </div>
-</div>`: ''}
-</div>`: ''}
-</div>`;
-}
-
-function elSummary(el) {
-  if (el.fields.text) return esc(el.fields.text.slice(0, 24) + (el.fields.text.length > 24 ? '...' : ''));
-  return `${el.fields.xOffset ?? 0}, ${el.fields.yOffset ?? 0}`;
-}
-function esc(s) { return String(s).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;') }
-
-function updateMeta() {
-  const s = activeSec ? getSec(activeSec) : null;
-  document.getElementById('meta-name').textContent = s ? s.name : '-';
-  document.getElementById('meta-count').textContent = s ? s.elements.length + ' element(s)' : '-';
-  document.getElementById('flag-drawFront').checked = s ? !!s.flags.drawFront : false;
-  document.getElementById('flag-clearBuffer').checked = s ? !!s.flags.clearBuffer : false;
-}
-
-// --- Preview ------------------------------------------------------------------
-let previewTimer = null;
-function triggerPreview() {
-  clearTimeout(previewTimer);
-  previewTimer = setTimeout(() => { try { buildPreview(); } catch (e) { console.warn('preview', e); } }, 150);
-}
-function buildPreview() {
-  if (!window.MonoDisplay) return;
-  const { MonoDisplayDriver, MonoDisplayFile, ElementType } = window.MonoDisplay;
-  if (!window._mdDriver)
-    window._mdDriver = new MonoDisplayDriver('canvas_root', { onColor: '#EC0', offColor: '#000', fps: 25 });
-  const s = activeSec ? getSec(activeSec) : sections[0];
-  if (!s || !s.elements.length) {
-    window._mdDriver.load(() => Promise.resolve(new MonoDisplayFile({ elements_always: [] }).toBuffer()));
-    return;
-  }
-  const elDefs = s.elements.map(el => ({ type: ElementType[el.type], ...el.fields, flags: el.flags })).filter(e => e.type != null);
-  window._mdDriver.load(() => Promise.resolve(
-    new MonoDisplayFile({ elements_always: { flags: s.flags, elements: elDefs } }).toBuffer()
-  ));
-}
-
-// --- Load / Export ------------------------------------------------------------
-function parsedToSections(parsedSecs) {
-  const TYPE_MAP = { 1: 'Image2D', 2: 'Animation', 16: 'ClippedText', 17: 'HScrollText', 32: 'CurrentTime' };
-  return parsedSecs
-    .filter(s => s.sectionType === 1 || s.sectionType === 2)
-    .map(s => {
-      secCounter++;
-      const elements = (s.elements || []).map(el => {
-        const typeName = TYPE_MAP[el.type];
-        if (!typeName) return null;
-        elCounter++;
-        let fields = {}, flags = {};
-        switch (typeName) {
-          case 'Image2D':
-            fields = { xOffset: el.xOffset, yOffset: el.yOffset, width: el.image?.width ?? W, height: el.image?.height ?? H, pixels: el.image?.pixels };
-            break;
-          case 'Animation':
-            fields = { xOffset: el.xOffset, yOffset: el.yOffset, width: el.width, height: el.height, updateInterval: el.updateInterval, frames: el.frames };
-            break;
-          case 'ClippedText':
-            fields = { text: el.text, xOffset: el.xOffset, yOffset: el.yOffset, width: el.width, height: el.height };
-            break;
-          case 'HScrollText':
-            fields = { text: el.text, xOffset: el.xOffset, yOffset: el.yOffset, width: el.width, height: el.height, scrollSpeed: el.scrollSpeed };
-            flags = { endless: !!el.flags?.endless, invertDirection: !!el.flags?.invertDirection };
-            break;
-          case 'CurrentTime':
-            fields = { xOffset: el.xOffset, yOffset: el.yOffset, width: el.width, height: el.height, utcOffsetMinutes: el.utcOffsetMinutes };
-            flags = { clock12h: !!el.flags?.clock12h, showHours: !!el.flags?.showHours, showSeconds: !!el.flags?.showSeconds };
-            break;
-        }
-        return { id: 'e' + elCounter, type: typeName, fields, flags };
-      }).filter(Boolean);
-      return {
-        id: 's' + secCounter,
-        name: 'Section ' + secCounter,
-        open: true,
-        flags: { drawFront: !!s.flags?.drawFront, clearBuffer: !!s.flags?.clearBuffer },
-        elements
-      };
-    });
-}
-
-function loadBin(input) {
-  const file = input.files[0]; if (!file) return;
-  currentFilename = file.name;
-  document.getElementById('filename').textContent = file.name;
-  const reader = new FileReader();
-  reader.onload = e => {
-    const arrayBuf = e.target.result;
-    const buf = new Uint8Array(arrayBuf);
-    if (!window._mdDriver && window.MonoDisplay)
-      window._mdDriver = new window.MonoDisplay.MonoDisplayDriver('canvas_root', { onColor: '#EC0', offColor: '#000', fps: 25 });
-    if (window._mdDriver) window._mdDriver.load(() => Promise.resolve(buf));
-    try {
-      const parsed = new window.MonoDisplay.MonoDisplayParser().parse(arrayBuf);
-      sections = parsedToSections(parsed.sections);
-      activeSec = sections.length ? sections[0].id : null;
-      activeEl = null;
-      render();
-    } catch (err) {
-      console.warn('Could not parse sections from bin:', err);
-    }
-  };
-  reader.readAsArrayBuffer(file);
-  input.value = ''; markClean();
-}
-function exportBin() {
-  if (!window.MonoDisplay) { alert('MonoDisplay library not loaded.'); return; }
-  const { MonoDisplayFile, ElementType } = window.MonoDisplay;
-  const s = activeSec ? getSec(activeSec) : sections[0];
-  if (!s) { alert('Nothing to export.'); return; }
-  const elDefs = s.elements.map(el => ({ type: ElementType[el.type], ...el.fields, flags: el.flags })).filter(e => e.type != null);
-  const buf = new MonoDisplayFile({ elements_always: { flags: s.flags, elements: elDefs } }).toBuffer();
-  const blob = new Blob([buf], { type: 'application/octet-stream' });
-  const a = document.createElement('a');
-  a.href = URL.createObjectURL(blob);
-  a.download = currentFilename.replace(/\.bin$/, '') + '.bin';
-  a.click(); markClean();
-}
-
-// --- Theme --------------------------------------------------------------------
-var _THEMES = ['dark', 'light', 'auto'];
-function _getTheme() { return document.documentElement.getAttribute('data-theme') || 'auto'; }
-function _applyTheme(t) {
-  if (t === 'auto') { document.documentElement.removeAttribute('data-theme'); localStorage.removeItem('theme'); }
-  else { document.documentElement.setAttribute('data-theme', t); localStorage.setItem('theme', t); }
-  _updateThemeBtn();
-}
-function cycleTheme() {
-  var cur = _getTheme(), idx = _THEMES.indexOf(cur);
-  _applyTheme(_THEMES[(idx + 1) % _THEMES.length]);
-}
-function _detectDR() {
-  return !!(document.querySelector('meta[name="darkreader"]') ||
-    document.querySelector('style[data-darkreader-style]') ||
-    document.documentElement.getAttribute('data-darkreader-mode'));
-}
-function _updateThemeBtn() {
-  var btn = document.getElementById('theme-toggle');
-  if (!btn) return;
-  var t = _getTheme(), dr = _detectDR();
-  var lbl = { dark: '☾ dark', light: '☀ light', auto: '⊙ auto' };
-  btn.textContent = (dr ? 'DR · ' : '') + (lbl[t] || lbl.auto);
-  btn.title = dr ? 'DarkReader active - controlling theme' : ('Theme: ' + t + ' (click to cycle)');
-}
-window.addEventListener('DOMContentLoaded', _updateThemeBtn);
-
-// --- Init ---------------------------------------------------------------------
-// Pin all functions referenced from inline HTML onclick/onchange strings so
-// Bun's bundler does not tree-shake them as unreachable dead code.
-Object.assign(window, {
-  loadBin, exportBin,
-  addSection, removeSection, toggleSection, setSectionFlag,
-  addElement, removeElement, selectElement,
-  changeElType, setElField, setElFlag,
-  cycleTheme,
-});
-
-render();
-if (window.MonoDisplay) { initDemos(); }
-else { const iv = setInterval(() => { if (window.MonoDisplay) { clearInterval(iv); initDemos(); } }, 100); }