diff --git a/ts/index.html b/ts/index.html
index 1618acb..7bde6fb 100644
--- a/ts/index.html
+++ b/ts/index.html
@@ -25,7 +25,6 @@
       font-size: 12px
     }
 
-    /* TOP BAR */
     #topbar {
       height: 36px;
       background: #1a1a1a;
@@ -97,14 +96,16 @@
       background: #2a2a2a
     }
 
-    /* MAIN */
+    .dirty {
+      color: #886622 !important
+    }
+
     #main {
       flex: 1;
       display: flex;
       min-height: 0
     }
 
-    /* LEFT */
     #left {
       width: 48%;
       border-right: 1px solid #1e1e1e;
@@ -140,7 +141,13 @@
       text-transform: uppercase
     }
 
-    /* SECTION META */
+    #demo-btns {
+      display: flex;
+      flex-wrap: wrap;
+      gap: 5px;
+      margin-top: 6px
+    }
+
     #sec-meta {
       background: #141414;
       border: 1px solid #1e1e1e;
@@ -185,7 +192,6 @@
       cursor: pointer
     }
 
-    /* RIGHT */
     #right {
       flex: 1;
       display: flex;
@@ -213,38 +219,6 @@
       text-transform: uppercase
     }
 
-    .rh-btn {
-      background: transparent;
-      color: #444;
-      border: 1px solid #252525;
-      border-radius: 3px;
-      padding: 2px 8px;
-      font-family: monospace;
-      font-size: 11px;
-      cursor: pointer;
-      display: flex;
-      align-items: center;
-      gap: 4px;
-      white-space: nowrap
-    }
-
-    .rh-btn:hover {
-      color: #aaa;
-      border-color: #3a3a3a;
-      background: #1a1a1a
-    }
-
-    .rh-btn svg {
-      width: 11px;
-      height: 11px;
-      stroke: currentColor;
-      fill: none;
-      stroke-width: 2;
-      stroke-linecap: round;
-      stroke-linejoin: round
-    }
-
-    /* SECTIONS SCROLL */
     #sections-wrap {
       flex: 1;
       overflow-y: auto;
@@ -259,7 +233,7 @@
       line-height: 2
     }
 
-    /* SECTION CARD */
+    /* section card */
     .sec-card {
       border: 1px solid #222;
       border-radius: 3px;
@@ -278,7 +252,8 @@
       padding: 6px 8px;
       cursor: pointer;
       user-select: none;
-      background: #161616
+      background: #161616;
+      position: relative
     }
 
     .sec-hdr:hover {
@@ -317,24 +292,26 @@
       flex-shrink: 0
     }
 
-    .sec-del {
+    /* red ×  — section & element */
+    .x-btn {
       background: none;
       border: none;
       color: #2a2a2a;
       cursor: pointer;
       font-size: 15px;
       line-height: 1;
-      padding: 1px 4px;
+      padding: 2px 5px;
       border-radius: 2px;
-      flex-shrink: 0
+      flex-shrink: 0;
+      transition: color .1s, background .1s
     }
 
-    .sec-del:hover {
-      color: #cc3333;
+    .x-btn:hover {
+      color: #ff4444;
       background: #1e1010
     }
 
-    /* ELEMENT LIST */
+    /* element */
     .el-list {
       background: #0f0f0f;
       border-top: 1px solid #1c1c1c;
@@ -382,25 +359,13 @@
     .el-name {
       flex: 1;
       color: #555;
-      font-size: 11px
-    }
-
-    .el-del {
-      background: none;
-      border: none;
-      color: #252525;
-      cursor: pointer;
-      font-size: 13px;
-      line-height: 1;
-      padding: 2px 4px;
-      border-radius: 2px
-    }
-
-    .el-del:hover {
-      color: #cc3333
+      font-size: 11px;
+      overflow: hidden;
+      text-overflow: ellipsis;
+      white-space: nowrap;
+      max-width: 120px
     }
 
-    /* FIELDS */
     .el-fields {
       padding: 6px 8px 8px;
       border-top: 1px solid #1a1a1a;
@@ -488,6 +453,70 @@
       color: #888;
       border-color: #444
     }
+
+    /* confirm dialog */
+    #confirm-overlay {
+      display: none;
+      position: fixed;
+      inset: 0;
+      background: rgba(0, 0, 0, .6);
+      z-index: 100;
+      align-items: center;
+      justify-content: center
+    }
+
+    #confirm-overlay.show {
+      display: flex
+    }
+
+    #confirm-box {
+      background: #1a1a1a;
+      border: 1px solid #333;
+      border-radius: 4px;
+      padding: 20px 24px;
+      max-width: 340px;
+      width: 90%;
+      display: flex;
+      flex-direction: column;
+      gap: 14px
+    }
+
+    #confirm-msg {
+      color: #aaa;
+      font-size: 12px;
+      line-height: 1.6
+    }
+
+    #confirm-btns {
+      display: flex;
+      gap: 8px;
+      justify-content: flex-end
+    }
+
+    .cb {
+      background: #161616;
+      color: #888;
+      border: 1px solid #2d2d2d;
+      border-radius: 3px;
+      padding: 4px 14px;
+      font-family: monospace;
+      font-size: 11px;
+      cursor: pointer
+    }
+
+    .cb:hover {
+      background: #222;
+      color: #bbb
+    }
+
+    .cb.primary {
+      border-color: #2b3d2b;
+      color: #33ff66
+    }
+
+    .cb.primary:hover {
+      background: #182018
+    }
   </style>
 </head>
 
@@ -525,16 +554,13 @@
   </div>
 
   <div id="main">
-    <!-- LEFT: preview + meta -->
     <div id="left">
       <span class="pv-label">preview · 160 × 80</span>
       <div id="display-box">
         <canvas id="canvas_root" width="160" height="80"></canvas>
       </div>
-      <div id="demos">
-        <span class="pv-label">demos</span>
-        <div id="demo-btns" style="display:flex;flex-wrap:wrap;gap:5px;margin-top:6px"></div>
-      </div>
+      <span class="pv-label">demos</span>
+      <div id="demo-btns"></div>
       <div id="sec-meta">
         <div class="meta-row">
           <label>Selected section</label>
@@ -558,7 +584,6 @@
       </div>
     </div>
 
-    <!-- RIGHT: section + element editor -->
     <div id="right">
       <div id="right-hdr">
         <span class="rh-title">sections</span>
@@ -569,21 +594,25 @@
     </div>
   </div>
 
-  <!-- Assumes mono-display.js is loaded in the real page -->
-  <script src="./public/mono-display.js"></script>
+  <!-- confirm dialog -->
+  <div id="confirm-overlay">
+    <div id="confirm-box">
+      <div id="confirm-msg"></div>
+      <div id="confirm-btns"></div>
+    </div>
+  </div>
 
+  <script src="./public/mono-display.js"></script>
   <script>
-    // ─── State ───────────────────────────────────────────────────────────────────
     const W = 160, H = 80;
-    let sections = [];   // [{id,name,open,flags:{drawFront,clearBuffer},elements:[…]}]
-    let activeSec = null; // id
-    let activeEl = null;  // {secId,elId}
+    let sections = [];
+    let activeSec = null, activeEl = null;
     let secCounter = 0, elCounter = 0;
     let currentFilename = 'untitled';
+    let isDirty = false;
 
-    // ─── Element type definitions ─────────────────────────────────────────────────
+    // ─── 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 },
@@ -611,14 +640,50 @@
         { 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' }],
     };
 
-    // ─── Helpers ──────────────────────────────────────────────────────────────────
+    // ─── 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 {
@@ -639,47 +704,35 @@
 
     // ─── Mutations ────────────────────────────────────────────────────────────────
     function addSection() {
-      const s = newSec();
-      sections.push(s);
-      activeSec = s.id;
-      activeEl = null;
-      render();
-      triggerPreview();
+      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; }
-      render();
-      triggerPreview();
+      markDirty(); render(); triggerPreview();
     }
     function toggleSection(id) {
       const s = getSec(id); if (!s) return;
-      s.open = !s.open;
-      activeSec = id;
-      render();
-      updateMeta();
+      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;
-      triggerPreview();
+      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 };
-      render();
-      triggerPreview();
+      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;
-      render();
-      triggerPreview();
+      markDirty(); render(); triggerPreview();
     }
     function selectElement(secId, elId) {
       activeSec = secId;
@@ -690,18 +743,155 @@
       const el = getEl(secId, elId); if (!el) return;
       const fresh = newEl(type);
       el.type = type; el.fields = fresh.fields; el.flags = fresh.flags;
-      render();
-      triggerPreview();
+      markDirty(); render(); triggerPreview();
     }
     function setElField(secId, elId, key, val) {
       const el = getEl(secId, elId); if (!el) return;
-      el.fields[key] = val;
-      triggerPreview();
+      el.fields[key] = val; markDirty(); triggerPreview();
     }
     function setElFlag(secId, elId, key, val) {
       const el = getEl(secId, elId); if (!el) return;
-      el.flags[key] = val;
-      triggerPreview();
+      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: false, 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: 120, 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 ───────────────────────────────────────────────────────────────────
@@ -716,15 +906,14 @@
     }
 
     function renderSection(s) {
-      const isActive = activeSec === s.id;
-      const isOpen = s.open;
+      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">${s.elements.length} el</span>
-    <button class="sec-del" title="Remove section" onclick="event.stopPropagation();removeSection('${s.id}')">×</button>
+    <button class="x-btn" title="Remove section" onclick="event.stopPropagation();removeSection('${s.id}')">×</button>
   </div>
   ${isOpen ? `
   <div class="el-list">
@@ -743,7 +932,7 @@
   <div class="el-item-hdr" onclick="selectElement('${secId}','${el.id}')">
     <span class="el-type">${el.type}</span>
     <span class="el-name">${elSummary(el)}</span>
-    <button class="el-del" title="Remove" onclick="event.stopPropagation();removeElement('${secId}','${el.id}')">×</button>
+    <button class="x-btn" title="Remove element" onclick="event.stopPropagation();removeElement('${secId}','${el.id}')">×</button>
   </div>
   ${isActive ? `
   <div class="el-fields">
@@ -792,67 +981,46 @@
       document.getElementById('flag-clearBuffer').checked = s ? !!s.flags.clearBuffer : false;
     }
 
-    // ─── Preview (stub — replace with real MonoDisplayFile/Driver calls) ──────────
+    // ─── Preview ──────────────────────────────────────────────────────────────────
     let previewTimer = null;
     function triggerPreview() {
       clearTimeout(previewTimer);
-      previewTimer = setTimeout(() => {
-        try { buildPreview(); } catch (e) { console.warn('preview error', e); }
-      }, 150);
+      previewTimer = setTimeout(() => { try { buildPreview(); } catch (e) { console.warn('preview', e); } }, 150);
     }
     function buildPreview() {
-      if (!window.MonoDisplay) return; // lib not loaded yet
+      if (!window.MonoDisplay) return;
       const { MonoDisplayDriver, MonoDisplayFile, ElementType } = window.MonoDisplay;
-
-      // Grab or init driver
-      if (!window._mdDriver) {
+      if (!window._mdDriver)
         window._mdDriver = new MonoDisplayDriver('canvas_root', { onColor: '#EC0', offColor: '#000', fps: 25 });
-      }
-
-      // Build the active section only (or first section as fallback)
       const s = activeSec ? getSec(activeSec) : sections[0];
       if (!s || !s.elements.length) {
-        // Clear display
-        window._mdDriver.load(() => Promise.resolve(
-          new MonoDisplayFile({ elements_always: [] }).toBuffer()
-        ));
+        window._mdDriver.load(() => Promise.resolve(new MonoDisplayFile({ elements_always: [] }).toBuffer()));
         return;
       }
-
-      const elDefs = s.elements.map(el => {
-        const base = { type: ElementType[el.type], ...el.fields, flags: el.flags };
-        return base;
-      }).filter(e => e.type != null);
-
-      const file = new MonoDisplayFile({
-        elements_always: { flags: s.flags, elements: elDefs },
-      });
-      window._mdDriver.load(() => Promise.resolve(file.toBuffer()));
+      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 loadBin(input) {
-      const file = input.files[0];
-      if (!file) return;
+      const file = input.files[0]; if (!file) return;
       currentFilename = file.name;
       document.getElementById('filename').textContent = file.name;
-      // TODO: parse binary → sections state when you expose a fromBuffer() API
-      // For now just feed it straight to the driver for preview
       const reader = new FileReader();
       reader.onload = e => {
         const buf = new Uint8Array(e.target.result);
-        if (window._mdDriver) {
-          window._mdDriver.load(() => Promise.resolve(buf));
-        }
+        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));
       };
       reader.readAsArrayBuffer(file);
-      input.value = '';
+      input.value = ''; markClean();
     }
-
     function exportBin() {
       if (!window.MonoDisplay) { alert('MonoDisplay library not loaded.'); return; }
       const { MonoDisplayFile, ElementType } = window.MonoDisplay;
-      // Export all sections — stub: only exports active/first
       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);
@@ -861,100 +1029,11 @@
       const a = document.createElement('a');
       a.href = URL.createObjectURL(blob);
       a.download = currentFilename.replace(/\.bin$/, '') + '.bin';
-      a.click();
-    }
-
-    // ─── Demos ────────────────────────────────────────────────────────────────────
-    const DEMOS = [
-      {
-        label: 'Checkerboard', make() {
-          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();
-        }
-      },
-      {
-        label: 'Blink', make() {
-          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();
-        }
-      },
-      {
-        label: 'Text', make() {
-          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();
-        }
-      },
-      {
-        label: 'Scrolltext', make() {
-          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();
-        }
-      },
-      {
-        label: 'Time', make() {
-          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: 120, yOffset: 32, width: W, height: 16, utcOffsetMinutes: 120 },
-              ],
-            }
-          }).toBuffer();
-        }
-      },
-    ];
-
-    function initDemos() {
-      if (!window.MonoDisplay) return;
-      const { MonoDisplayFile, ElementType } = window.MonoDisplay;
-      const wrap = document.getElementById('demo-btns');
-      let activeBtn = null;
-      DEMOS.forEach(d => {
-        const btn = document.createElement('button');
-        btn.className = 'tb-btn';
-        btn.textContent = d.label;
-        btn.onclick = () => {
-          if (activeBtn) activeBtn.style.color = '';
-          btn.style.color = '#33ff66';
-          activeBtn = btn;
-          if (!window._mdDriver)
-            window._mdDriver = new window.MonoDisplay.MonoDisplayDriver('canvas_root', { onColor: '#EC0', offColor: '#000', fps: 25 });
-          window._mdDriver.load(() => Promise.resolve(d.make()));
-        };
-        wrap.appendChild(btn);
-      });
+      a.click(); markClean();
     }
 
     // ─── Init ─────────────────────────────────────────────────────────────────────
     render();
-    // Defer demo init until lib is available
     if (window.MonoDisplay) { initDemos(); }
     else { const iv = setInterval(() => { if (window.MonoDisplay) { clearInterval(iv); initDemos(); } }, 100); }
   </script>