diff --git a/demo/index.html b/demo/index.html
index 1f23f9c..5e74e73 100644
--- a/demo/index.html
+++ b/demo/index.html
@@ -3,17 +3,17 @@
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-</style><main><aside class="sidebar"><header><div class="eyebrow">Kimodo-SMPLX-RP-v1 · Vulkan</div><div class="product-title"><span class="product-mark">K</span><h1>Text to motion</h1></div></header><section class="card promptbox"><label for="prompt">Describe a motion</label><textarea id="prompt">A person runs forward and then leaps over an obstacle in front of them.</textarea><button id="generate">Generate motion</button><span id="status" class="readout">Ready</span><div class="hint">One generation runs at a time. Select an animation below to restore and edit its prompt.</div></section><section class="card history"><div class="gallery"><h2>Past animations</h2><div id="items" class="readout">Loading…</div></div></section><div class="localai-brand"><span>Powered locally with</span><img src="/localai.png" alt="LocalAI"></div></aside><section class="stage"><canvas id="view" width="1280" height="720" aria-label="Animated SMPL-X skeleton"></canvas><div class="controls"><button id="play">Pause</button><button id="reset">Reset view</button><input id="frame" type="range" min="0" value="0" step="1"><span id="frameText" class="readout"></span><span class="camera">Drag: rotate · wheel: zoom · Shift/right-drag: pan · double-click: reset</span></div></section></main>
+</style><main><aside class="sidebar"><header><div class="eyebrow">Kimodo-SMPLX-RP-v1 · Vulkan</div><div class="product-title"><span class="product-mark">K</span><h1>Text to motion</h1></div></header><section class="card promptbox"><label for="prompt">Describe a motion</label><textarea id="prompt">A person runs forward and then leaps over an obstacle in front of them.</textarea><button id="generate">Generate motion</button><span id="status" class="readout">Ready</span><div class="hint">One generation runs at a time. Select an animation below to restore and edit its prompt.</div></section><section class="card history"><div class="gallery"><h2>Past animations</h2><div id="items" class="readout">Loading…</div></div></section><div class="localai-brand"><span>Powered locally with</span><img src="/localai.png" alt="LocalAI"></div></aside><section class="stage"><canvas id="view" width="1280" height="720" aria-label="Animated SMPL-X skeleton"></canvas><div class="controls"><button id="play">Pause</button><button id="reset">Reset view</button><input id="frame" type="range" min="0" value="0" step="1"><span id="frameText" class="readout"></span><span class="camera">Camera tracks motion · Drag: rotate · wheel: zoom · Shift/right-drag: pan · double-click: reset</span></div></section></main>
 <script src="/models.js"></script><script>
 const parents=[-1,0,0,0,1,2,3,4,5,6,7,8,9,9,9,12,13,14,16,17,18,19];
 // SMPL-X22 rest offsets calibrated from the captured upstream posed-joint /
 // global-rotation fixture. The generator persists local rotations and root
 // translations; these fixed parent-local bone vectors make them viewable here.
 const offsets=[[0,0,0],[.052299,-.093936,-.027607],[-.057193,-.106548,-.022218],[-.001496,.11293,-.024981],[.058867,-.416442,-.006557],[-.048074,-.39756,-.014061],[.0069,.145636,-.006859],[-.041738,-.437584,-.029512],[.014489,-.446853,-.01803],[-.010334,.056082,.021116],[.049294,-.065279,.126259],[-.040575,-.065287,.127076],[-.011026,.171365,-.028827],[.047725,.087643,-.008375],[-.046636,.086612,-.014864],[.024654,.175391,.024463],[.126285,.05768,-.013885],[-.109342,.053674,-.009118],[.272907,-.069853,-.039094],[-.292029,-.03544,-.024565],[.276174,.021254,-.002478],[-.271878,-.004835,-.016445]];
-const canvas=document.querySelector('#view'),ctx=canvas.getContext('2d'),slider=document.querySelector('#frame'),promptBox=document.querySelector('#prompt'),generate=document.querySelector('#generate'),status=document.querySelector('#status'),items=document.querySelector('#items');let selected,root,rotations,frame=0,playing=true,last=0,animations=[],activeRequest,activeStarted;const defaultView={yaw:-.68,pitch:-.20,zoom:2700,panX:0,panY:0},view={...defaultView};
-function reset(){Object.assign(view,defaultView);draw()}function rotate(q,v){const[x,y,z,w]=q,[vx,vy,vz]=v,tx=2*(y*vz-z*vy),ty=2*(z*vx-x*vz),tz=2*(x*vy-y*vx);return[vx+w*tx+y*tz-z*ty,vy+w*ty+z*tx-x*tz,vz+w*tz+x*ty-y*tx]};function add(a,b){return[a[0]+b[0],a[1]+b[1],a[2]+b[2]]}function multiply(a,b){const[x,y,z,w]=a,[X,Y,Z,W]=b;return[x*W+w*X+y*Z-z*Y,y*W+w*Y+z*X-x*Z,z*W+w*Z+x*Y-y*X,w*W-x*X-y*Y-z*Z]}
-function pose(){if(!selected||!root||!rotations)return[];const positions=[],global=[];for(let j=0;j<22;j++){const q=Array.from(rotations.subarray((frame*22+j)*4,(frame*22+j+1)*4)),p=parents[j];if(p<0){global[j]=q;positions[j]=Array.from(root.subarray(frame*3,frame*3+3))}else{global[j]=multiply(global[p],q);positions[j]=add(positions[p],rotate(global[p],offsets[j]))}}return positions}function project([x,y,z]){const rx=x*Math.cos(view.yaw)-z*Math.sin(view.yaw),rz=x*Math.sin(view.yaw)+z*Math.cos(view.yaw),ry=y*Math.cos(view.pitch)-rz*Math.sin(view.pitch),dz=y*Math.sin(view.pitch)+rz*Math.cos(view.pitch)+8;return[canvas.width/2+view.panX+view.zoom*rx/dz,canvas.height*.78+view.panY-view.zoom*ry/dz]}
-function ground(){const cx=0,cz=0,step=.5,extent=6;ctx.strokeStyle='#173943';ctx.lineWidth=2;for(let i=-12;i<=12;i++){let a=project([cx-extent,0,cz+i*step]),b=project([cx+extent,0,cz+i*step]);ctx.beginPath();ctx.moveTo(a[0],a[1]);ctx.lineTo(b[0],b[1]);ctx.stroke();a=project([cx+i*step,0,cz-extent]);b=project([cx+i*step,0,cz+extent]);ctx.beginPath();ctx.moveTo(a[0],a[1]);ctx.lineTo(b[0],b[1]);ctx.stroke()}ctx.strokeStyle='#23606b';ctx.lineWidth=3;const x=project([cx-extent,0,cz]),z=project([cx,0,cz-extent]),xe=project([cx+extent,0,cz]),ze=project([cx,0,cz+extent]);ctx.beginPath();ctx.moveTo(x[0],x[1]);ctx.lineTo(xe[0],xe[1]);ctx.moveTo(z[0],z[1]);ctx.lineTo(ze[0],ze[1]);ctx.stroke()}function draw(){ctx.clearRect(0,0,canvas.width,canvas.height);const p=pose();ground();if(p.length){ctx.lineCap='round';for(let pass=0;pass<2;pass++){ctx.strokeStyle=pass?'#65eee1':'#071014';ctx.lineWidth=pass?7:13;for(let i=1;i<22;i++){const a=project(p[i]),b=project(p[parents[i]]);ctx.beginPath();ctx.moveTo(a[0],a[1]);ctx.lineTo(b[0],b[1]);ctx.stroke()}}for(const x of p){const a=project(x);ctx.fillStyle='#071014';ctx.beginPath();ctx.arc(a[0],a[1],7,0,Math.PI*2);ctx.fill();ctx.fillStyle='#ecfffd';ctx.beginPath();ctx.arc(a[0],a[1],4,0,Math.PI*2);ctx.fill()}}slider.value=frame;document.querySelector('#frameText').textContent=selected?`frame ${frame+1} / ${selected.frames}`:'No animation selected'}function tick(t){if(playing&&selected&&t-last>1000/30){frame=(frame+1)%selected.frames;last=t;draw()}requestAnimationFrame(tick)}
-async function select(a){if(a.status!=='ready')return;selected=a;promptBox.value=a.prompt;window.dispatchEvent(new CustomEvent('kimodo:restore-sequence',{detail:{segments:a.segments,model:a.model}}));status.className='readout';status.textContent=`Selected ${a.id.slice(0,8)} · sequence restored`;[root,rotations]=await Promise.all([fetch(`/api/animations/${a.id}/root.f32`).then(r=>r.arrayBuffer()).then(b=>new Float32Array(b)),fetch(`/api/animations/${a.id}/rotations.f32`).then(r=>r.arrayBuffer()).then(b=>new Float32Array(b))]);frame=0;slider.max=a.frames-1;renderGallery();draw()}function renderGallery(){if(!animations.length){items.textContent='No animations yet.';return}items.replaceChildren(...animations.map(a=>{const b=document.createElement('button');b.className='item '+a.status+(selected?.id===a.id?' active':'');b.disabled=a.status!=='ready';b.innerHTML=`<p>${a.prompt}</p><span class="status">${a.status} · ${a.frames} frames · ${a.diffusion_steps} steps</span>${a.error?`<div class="error">${a.error}</div>`:''}`;b.onclick=()=>select(a);return b}))}function showProgress(){const a=animations.find(a=>a.id===activeRequest);if(!a)return;if(a.status==='ready'){status.className='readout';status.textContent='Generation complete — select it from the gallery to play it.';activeRequest=undefined;generate.disabled=false;return}if(a.status==='failed'){status.className='error';status.textContent=`Generation failed: ${a.error}`;activeRequest=undefined;generate.disabled=false;return}const seconds=Math.max(0,Math.floor((Date.now()-activeStarted)/1000));status.className='readout progress';status.textContent=a.status==='running'?`Generating motion… ${seconds}s elapsed`:`Queued for generation… ${seconds}s elapsed`;generate.disabled=true}async function refresh(){animations=await fetch('/api/animations').then(r=>r.json());renderGallery();showProgress()}generate.onclick=async()=>{const prompt=promptBox.value.trim();if(!prompt)return;generate.disabled=true;status.className='readout progress';status.textContent='Submitting generation…';try{const r=await fetch('/api/generate',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({prompt,frames:150,steps:100,seed:0})});if(!r.ok)throw new Error(await r.text());const a=await r.json();activeRequest=a.id;activeStarted=Date.now();await refresh()}catch(e){status.className='error';status.textContent=e.message;generate.disabled=false}};
-document.querySelector('#play').onclick=e=>{playing=!playing;e.target.textContent=playing?'Pause':'Play'};slider.oninput=()=>{frame=Number(slider.value);draw()};document.querySelector('#reset').onclick=reset;canvas.addEventListener('dblclick',reset);canvas.addEventListener('contextmenu',e=>e.preventDefault());let drag;canvas.addEventListener('pointerdown',e=>{canvas.setPointerCapture(e.pointerId);drag={x:e.clientX,y:e.clientY,pan:e.button===2||e.shiftKey};canvas.classList.add('dragging')});canvas.addEventListener('pointermove',e=>{if(!drag)return;const dx=e.clientX-drag.x,dy=e.clientY-drag.y;drag.x=e.clientX;drag.y=e.clientY;if(drag.pan){view.panX+=dx;view.panY+=dy}else{view.yaw+=dx*.008;view.pitch=Math.max(-1.25,Math.min(1.25,view.pitch+dy*.008))}draw()});function end(){drag=undefined;canvas.classList.remove('dragging')}canvas.addEventListener('pointerup',end);canvas.addEventListener('pointercancel',end);canvas.addEventListener('wheel',e=>{e.preventDefault();view.zoom=Math.max(350,Math.min(3600,view.zoom*Math.exp(-e.deltaY*.001)));draw()},{passive:false});refresh().then(()=>{const a=animations.find(a=>a.status==='ready');if(a)return select(a);draw()});setInterval(refresh,2500);requestAnimationFrame(tick);
+const canvas=document.querySelector('#view'),ctx=canvas.getContext('2d'),slider=document.querySelector('#frame'),promptBox=document.querySelector('#prompt'),generate=document.querySelector('#generate'),status=document.querySelector('#status'),items=document.querySelector('#items');let selected,root,rotations,frame=0,playbackBlend=0,playing=true,last=0,cameraLast=0,animations=[],activeRequest,activeStarted;const defaultView={yaw:-.68,pitch:-.20,zoom:2700,panX:0,panY:0,cameraX:0,cameraZ:0,cameraZoom:2700,cameraSpeed:0},view={...defaultView};
+function renderedRoot(){if(!selected||!root)return[0,0,0];const at=frame*3,next=((frame+1)%selected.frames)*3,b=playbackBlend;return[root[at]*(1-b)+root[next]*b,root[at+1]*(1-b)+root[next+1]*b,root[at+2]*(1-b)+root[next+2]*b]}function snapCamera(){const[x,,z]=renderedRoot();view.cameraX=x;view.cameraZ=z;view.cameraZoom=view.zoom;view.cameraSpeed=0;cameraLast=performance.now()}function reset(){Object.assign(view,defaultView);snapCamera();draw()}function updateCamera(now){if(!selected||!root)return;const dt=Math.min(.1,Math.max(0,(now-cameraLast)/1000));cameraLast=now;const at=frame*3,next=((frame+1)%selected.frames)*3,[rootX,,rootZ]=renderedRoot(),speed=playing?Math.hypot(root[next]-root[at],root[next+2]-root[at+2])*30:0,dx=rootX-view.cameraX,dz=rootZ-view.cameraZ,distance=Math.hypot(dx,dz),deadZone=.18;const targetX=distance>deadZone?rootX-dx/distance*deadZone:view.cameraX,targetZ=distance>deadZone?rootZ-dz/distance*deadZone:view.cameraZ,follow=1-Math.exp(-3*dt),speedFollow=1-Math.exp(-2.4*dt),zoomFollow=1-Math.exp(-2.6*dt);view.cameraSpeed+=(speed-view.cameraSpeed)*speedFollow;const targetZoom=view.zoom*(1-Math.min(.22,view.cameraSpeed*.035));view.cameraX+=(targetX-view.cameraX)*follow;view.cameraZ+=(targetZ-view.cameraZ)*follow;view.cameraZoom+=(targetZoom-view.cameraZoom)*zoomFollow}function rotate(q,v){const[x,y,z,w]=q,[vx,vy,vz]=v,tx=2*(y*vz-z*vy),ty=2*(z*vx-x*vz),tz=2*(x*vy-y*vx);return[vx+w*tx+y*tz-z*ty,vy+w*ty+z*tx-x*tz,vz+w*tz+x*ty-y*tx]};function add(a,b){return[a[0]+b[0],a[1]+b[1],a[2]+b[2]]}function multiply(a,b){const[x,y,z,w]=a,[X,Y,Z,W]=b;return[x*W+w*X+y*Z-z*Y,y*W+w*Y+z*X-x*Z,z*W+w*Z+x*Y-y*X,w*W-x*X-y*Y-z*Z]}
+function pose(){if(!selected||!root||!rotations)return[];const positions=[],global=[],rootPosition=renderedRoot();for(let j=0;j<22;j++){const q=Array.from(rotations.subarray((frame*22+j)*4,(frame*22+j+1)*4)),p=parents[j];if(p<0){global[j]=q;positions[j]=rootPosition}else{global[j]=multiply(global[p],q);positions[j]=add(positions[p],rotate(global[p],offsets[j]))}}return positions}function project([x,y,z]){x-=view.cameraX;z-=view.cameraZ;const rx=x*Math.cos(view.yaw)-z*Math.sin(view.yaw),rz=x*Math.sin(view.yaw)+z*Math.cos(view.yaw),ry=y*Math.cos(view.pitch)-rz*Math.sin(view.pitch),dz=y*Math.sin(view.pitch)+rz*Math.cos(view.pitch)+8;return[canvas.width/2+view.panX+view.cameraZoom*rx/dz,canvas.height*.78+view.panY-view.cameraZoom*ry/dz]}
+function ground(){const cx=0,cz=0,step=.5,initialExtent=6,drawGrid=(extent,alpha,colour,width)=>{ctx.globalAlpha=alpha;ctx.strokeStyle=colour;ctx.lineWidth=width;for(let i=-extent/step;i<=extent/step;i++){let a=project([cx-extent,0,cz+i*step]),b=project([cx+extent,0,cz+i*step]);ctx.beginPath();ctx.moveTo(a[0],a[1]);ctx.lineTo(b[0],b[1]);ctx.stroke();a=project([cx+i*step,0,cz-extent]),b=project([cx+i*step,0,cz+extent]);ctx.beginPath();ctx.moveTo(a[0],a[1]);ctx.lineTo(b[0],b[1]);ctx.stroke()}};const[x,,z]=renderedRoot(),rootDistance=Math.max(Math.abs(x),Math.abs(z)),outerAlpha=.72*Math.max(0,Math.min(1,(rootDistance-3.5)/2.5));if(outerAlpha)drawGrid(18,outerAlpha,'#173943',1);drawGrid(initialExtent,1,'#173943',2);ctx.globalAlpha=1;ctx.strokeStyle='#23606b';ctx.lineWidth=3;const xAxis=project([cx-initialExtent,0,cz]),zAxis=project([cx,0,cz-initialExtent]),xEnd=project([cx+initialExtent,0,cz]),zEnd=project([cx,0,cz+initialExtent]);ctx.beginPath();ctx.moveTo(xAxis[0],xAxis[1]);ctx.lineTo(xEnd[0],xEnd[1]);ctx.moveTo(zAxis[0],zAxis[1]);ctx.lineTo(zEnd[0],zEnd[1]);ctx.stroke()}function draw(){ctx.clearRect(0,0,canvas.width,canvas.height);const p=pose();ground();if(p.length){ctx.lineCap='round';for(let pass=0;pass<2;pass++){ctx.strokeStyle=pass?'#65eee1':'#071014';ctx.lineWidth=pass?7:13;for(let i=1;i<22;i++){const a=project(p[i]),b=project(p[parents[i]]);ctx.beginPath();ctx.moveTo(a[0],a[1]);ctx.lineTo(b[0],b[1]);ctx.stroke()}}for(const x of p){const a=project(x);ctx.fillStyle='#071014';ctx.beginPath();ctx.arc(a[0],a[1],7,0,Math.PI*2);ctx.fill();ctx.fillStyle='#ecfffd';ctx.beginPath();ctx.arc(a[0],a[1],4,0,Math.PI*2);ctx.fill()}}slider.value=frame;document.querySelector('#frameText').textContent=selected?`frame ${frame+1} / ${selected.frames}`:'No animation selected'}function tick(t){if(selected){const interval=1000/30;if(!last)last=t;if(playing){while(t-last>=interval){frame=(frame+1)%selected.frames;last+=interval}playbackBlend=Math.min(1,(t-last)/interval)}else playbackBlend=0;updateCamera(t);draw()}requestAnimationFrame(tick)}
+async function select(a){if(a.status!=='ready')return;selected=a;promptBox.value=a.prompt;window.dispatchEvent(new CustomEvent('kimodo:restore-sequence',{detail:{segments:a.segments,model:a.model}}));status.className='readout';status.textContent=`Selected ${a.id.slice(0,8)} · sequence restored`;[root,rotations]=await Promise.all([fetch(`/api/animations/${a.id}/root.f32`).then(r=>r.arrayBuffer()).then(b=>new Float32Array(b)),fetch(`/api/animations/${a.id}/rotations.f32`).then(r=>r.arrayBuffer()).then(b=>new Float32Array(b))]);frame=0;playbackBlend=0;last=performance.now();snapCamera();slider.max=a.frames-1;renderGallery();draw()}function renderGallery(){if(!animations.length){items.textContent='No animations yet.';return}items.replaceChildren(...animations.map(a=>{const b=document.createElement('button');b.className='item '+a.status+(selected?.id===a.id?' active':'');b.disabled=a.status!=='ready';b.innerHTML=`<p>${a.prompt}</p><span class="status">${a.status} · ${a.frames} frames · ${a.diffusion_steps} steps</span>${a.error?`<div class="error">${a.error}</div>`:''}`;b.onclick=()=>select(a);return b}))}function showProgress(){const a=animations.find(a=>a.id===activeRequest);if(!a)return;if(a.status==='ready'){status.className='readout';status.textContent='Generation complete — select it from the gallery to play it.';activeRequest=undefined;generate.disabled=false;return}if(a.status==='failed'){status.className='error';status.textContent=`Generation failed: ${a.error}`;activeRequest=undefined;generate.disabled=false;return}const seconds=Math.max(0,Math.floor((Date.now()-activeStarted)/1000));status.className='readout progress';status.textContent=a.status==='running'?`Generating motion… ${seconds}s elapsed`:`Queued for generation… ${seconds}s elapsed`;generate.disabled=true}async function refresh(){animations=await fetch('/api/animations').then(r=>r.json());renderGallery();showProgress()}generate.onclick=async()=>{const prompt=promptBox.value.trim();if(!prompt)return;generate.disabled=true;status.className='readout progress';status.textContent='Submitting generation…';try{const r=await fetch('/api/generate',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({prompt,frames:150,steps:100,seed:0})});if(!r.ok)throw new Error(await r.text());const a=await r.json();activeRequest=a.id;activeStarted=Date.now();await refresh()}catch(e){status.className='error';status.textContent=e.message;generate.disabled=false}};
+document.querySelector('#play').onclick=e=>{playing=!playing;last=performance.now();playbackBlend=0;e.target.textContent=playing?'Pause':'Play'};slider.oninput=()=>{frame=Number(slider.value);playbackBlend=0;last=performance.now();draw()};document.querySelector('#reset').onclick=reset;canvas.addEventListener('dblclick',reset);canvas.addEventListener('contextmenu',e=>e.preventDefault());let drag;canvas.addEventListener('pointerdown',e=>{canvas.setPointerCapture(e.pointerId);drag={x:e.clientX,y:e.clientY,pan:e.button===2||e.shiftKey};canvas.classList.add('dragging')});canvas.addEventListener('pointermove',e=>{if(!drag)return;const dx=e.clientX-drag.x,dy=e.clientY-drag.y;drag.x=e.clientX;e.clientY;drag.y=e.clientY;if(drag.pan){view.panX+=dx;view.panY+=dy}else{view.yaw+=dx*.008;view.pitch=Math.max(-1.25,Math.min(1.25,view.pitch+dy*.008))}draw()});function end(){drag=undefined;canvas.classList.remove('dragging')}canvas.addEventListener('pointerup',end);canvas.addEventListener('pointercancel',end);canvas.addEventListener('wheel',e=>{e.preventDefault();view.zoom=Math.max(350,Math.min(3600,view.zoom*Math.exp(-e.deltaY*.001)));draw()},{passive:false});refresh().then(()=>{const a=animations.find(a=>a.status==='ready');if(a)return select(a);draw()});setInterval(refresh,2500);requestAnimationFrame(tick);
 </script></html>
diff --git a/demo/main.go b/demo/main.go
index c52b428..703a459 100644
--- a/demo/main.go
+++ b/demo/main.go
@@ -360,8 +360,8 @@ func main() {
 			if request.Segments[index].Frames == 0 {
 				request.Segments[index].Frames = 150
 			}
-			if request.Segments[index].Prompt == "" || len(request.Segments[index].Prompt) > 4096 || request.Segments[index].Frames < 60 || request.Segments[index].Frames > 300 {
-				http.Error(w, "each prompt segment must be 60..300 frames and 1..4096 bytes", 400)
+			if request.Segments[index].Prompt == "" || len(request.Segments[index].Prompt) > 4096 || request.Segments[index].Frames < 60 || request.Segments[index].Frames > 150 {
+				http.Error(w, "each prompt segment must be 60..150 frames and 1..4096 bytes", 400)
 				return
 			}
 		}
diff --git a/demo/models.js b/demo/models.js
index 983e9c2..95c09eb 100644
--- a/demo/models.js
+++ b/demo/models.js
@@ -28,12 +28,20 @@ window.addEventListener('load', async () => {
   sequence.style.cssText = 'display:grid;gap:10px;width:100%';
   prompt.before(sequence);
   prompt.classList.add('sequence-prompt');
+  const minFrames = 60, maxFrames = 150;
   const segmentControls = new Map();
+  const validFrames = value => Number.isInteger(value) && value >= minFrames && value <= maxFrames;
+  const clampFrames = value => validFrames(Number(value)) ? Number(value) : Math.max(minFrames, Math.min(maxFrames, Number(value) || 150));
+  const configureDuration = (duration, frames) => {
+    duration.type = 'number'; duration.min = String(minFrames); duration.max = String(maxFrames); duration.step = '1'; duration.value = String(clampFrames(frames));
+    duration.title = `Frames (${minFrames}–${maxFrames})`;
+    duration.addEventListener('change', () => { duration.value = String(clampFrames(duration.value)); duration.setCustomValidity(''); });
+    duration.addEventListener('invalid', () => duration.setCustomValidity(`Use a whole number from ${minFrames} to ${maxFrames} frames.`));
+  };
   const primaryRow = document.createElement('div');
   primaryRow.style.cssText = 'display:grid;grid-template-columns:1fr 74px;gap:7px;align-items:start';
   const primaryDuration = document.createElement('input');
-  primaryDuration.type = 'number'; primaryDuration.min = '60'; primaryDuration.max = '300'; primaryDuration.step = '30'; primaryDuration.value = '150';
-  primaryDuration.title = 'Frames (60–300)';
+  configureDuration(primaryDuration, 150);
   primaryRow.append(prompt, primaryDuration); sequence.append(primaryRow);
   segmentControls.set(primaryRow, primaryDuration);
   const count = document.createElement('div'); count.className = 'hint';
@@ -45,7 +53,7 @@ window.addEventListener('load', async () => {
     const row = document.createElement('div'); row.style.cssText = 'display:grid;grid-template-columns:1fr 74px auto;gap:7px;align-items:start';
     const textArea = document.createElement('textarea'); textArea.className = 'sequence-prompt'; textArea.value = text;
     textArea.placeholder = 'Describe the next motion'; textArea.style.minHeight = '64px';
-    const duration = document.createElement('input'); duration.type = 'number'; duration.min = '60'; duration.max = '300'; duration.step = '30'; duration.value = String(frames); duration.title = 'Frames (60–300)';
+    const duration = document.createElement('input'); configureDuration(duration, frames);
     const remove = document.createElement('button'); remove.type = 'button'; remove.textContent = '×'; remove.title = 'Remove segment'; remove.style.cssText = 'padding:8px 12px;background:#24313a;color:#dce9e8';
     remove.onclick = () => { row.remove(); updateCount(); };
     row.append(textArea, duration, remove); sequence.append(row); segmentControls.set(row, duration);
@@ -68,12 +76,12 @@ window.addEventListener('load', async () => {
       : [{prompt: prompt.value, frames: 150}];
     const first = restored[0];
     prompt.value = first.prompt || '';
-    primaryDuration.value = String(first.frames || 150);
+    primaryDuration.value = String(clampFrames(first.frames));
     for (const row of [...sequence.children]) {
       if (row !== primaryRow) row.remove();
     }
     for (const segment of restored.slice(1)) {
-      addSegment(segment.prompt || '', segment.frames || 150);
+      addSegment(segment.prompt || '', clampFrames(segment.frames));
     }
     updateCount();
   });
@@ -87,7 +95,9 @@ window.addEventListener('load', async () => {
       body.segments = [...sequence.querySelectorAll('.sequence-prompt')].map(area => {
         const row = area.closest('div');
         const duration = segmentControls.get(row);
-        return {prompt: area.value, frames: Number(duration?.value || 150)};
+        const frames = Number(duration?.value);
+        if (!validFrames(frames)) throw new Error(`Each segment must be a whole number from ${minFrames} to ${maxFrames} frames.`);
+        return {prompt: area.value, frames};
       });
       return nativeFetch(input, {...init, body: JSON.stringify(body)});
     }