Back up verified OpenSysOne training snapshot and pinned source

publications/20260917T022835Z-hf-backup/b156513bf6ac1475eaa24fd79e7beb94d159364f/manifest.json

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+  },
+  "format": "opensysone-snapshot-publication-v1",
+  "repo_id": "andyshu/opensysone",
+  "snapshot_id": "20260917T022835Z-hf-backup",
+  "snapshot_path": "snapshots/20260917T022835Z-hf-backup",
+  "source_commit": "b156513bf6ac1475eaa24fd79e7beb94d159364f",
+  "training_source_commits": [
+    "4a60423c39d70f8d50472ce4f4f7fa4a4bd9fce1"
+  ]
+}

source/HANDOVER.md

@@ -273,7 +273,7 @@ changing the training jobs, fleet plan, API or repository visibility.
 ## Interactive model playground — 2026-09-17
 
 The user requested a GUI for text plus candidate answers and probabilities. It is
-running on GX10 at **http://127.0.0.1:7466**, PID **1469393**, source **`2d0ff79`**,
+running on GX10 at **http://127.0.0.1:7466**, PID **1469393**, backend source **`2d0ff79`**,
 OOM adjustment 0. From the Mac, run `ssh -N -L 7466:127.0.0.1:7466 gx10`, then
 open **http://localhost:7466**. See [PLAYGROUND.md](PLAYGROUND.md).
 
@@ -315,3 +315,18 @@ be collected by the replacement launcher. `stop.json` in the old runtime records
 that observation. The new process starts without a resident model and loads one
 on the next scoring request. The page, scripts, styles, model catalog and status
 respond on 7466; the old listener is closed. Evidence: `results/20260917-playground/port-7466.json`.
+
+The frontend now fits the viewport, with Context/Choices/Results tabs on compact
+screens and internally scrolling text/results. A fixed action bar and result-copy
+footer stay accessible. Very short portrait layouts compact optional content to
+retain readable inputs when a keyboard reduces the viewport. Browser fixture
+checks pass 13 sizes, including 320×568, 844×390 and 390×360; they check visible
+controls, readable input lines, loading, validation, keyboard tabs, resizing,
+long result lists, stale results, clipboard and recovery. Fixture probabilities
+are not new model evidence. See `results/20260917-playground-layout/`.
+
+The backend process and model snapshots continue unchanged. Static files are
+served directly from `web/` with no-store caching, so refresh the browser to use
+the layout. `frontend-current.json` in the active runtime records the current
+frontend commit and served-file hashes independently of the backend launch
+revision. Training source and processes were not modified for this relayout.

source/PLAYGROUND.md

@@ -19,6 +19,13 @@ invented inputs you can edit. Copy JSON exports the actual result to your clipbo
 Editing an input invalidates the previous result so it cannot be confused with a
 new question. Inputs are not saved to browser storage or request logs.
 
+The workspace fits the browser window. Desktop shows the editor and probabilities
+side by side. Phones and short windows use **Context**, **Choices**, and **Results**
+tabs, preserving your inputs when you switch. Arrow keys, Home and End navigate
+the tabs. Scoring opens Results; validation brings the affected field into view.
+Long input text and answer lists scroll inside their own areas, with actions
+remaining visible. Refresh an existing browser tab to load layout changes.
+
 The available snapshots are:
 
 | Model | Selected step | Calibration |
@@ -39,7 +46,7 @@ loads its weights. One request runs at a time; other requests receive a busy rep
 
 ## Runtime and controls
 
-The current server is running as PID **1469393**, source **`2d0ff79`**, with pending
+The current server is running as PID **1469393**, backend source **`2d0ff79`**, with pending
 exit status. Its immutable runtime is
 `/home/andy/ai/opensysone/runs/20260917T034059Z-playground-port7466`.
 
@@ -65,6 +72,8 @@ Before restarting, verify and stop the exact recorded playground process with
 SIGTERM. This is separate from the training jobs, fleet coordinator and final-model
 uploader. The server binds only to loopback; it requires no firewall or service
 configuration changes. No frontend dependency installation is required.
+Static assets are read afresh on each request; `frontend-current.json` in the
+runtime records the current frontend revision and verified served asset hashes.
 
 The server loads one model at a time, checks frozen checkpoint hashes and model
 metadata, and releases a previous model before loading a different one. The same
@@ -100,3 +109,19 @@ CHROMIUM_PATH=/home/andy/.cache/ms-playwright/chromium-1234/chrome-linux/chrome
 
 That command performs real inference and changes the resident GUI model during
 its checks. It does not train or alter checkpoints.
+
+For responsive layout checks without model inference, use the isolated fixture API:
+
+```bash
+PLAYWRIGHT_MODULE=/home/andy/projects/ultraviolet/node_modules/playwright-core \
+CHROMIUM_PATH=/home/andy/.cache/ms-playwright/chromium-1234/chrome-linux/chrome \
+  node scripts/verify_playground_layout.cjs \
+  /home/andy/ai/opensysone/runs/NEW-UNUSED-playground-layout-check
+```
+
+Its probabilities are test fixtures, not model output. It checks viewport fit,
+control visibility, tab navigation, input preservation, long result lists and
+error recovery across desktop, phone and landscape sizes.
+The relayout passed 13 viewport sizes, including 320×568 and short 390×360
+windows, with at least one readable line in every visible input. Reports and
+screenshots are in [`results/20260917-playground-layout`](results/20260917-playground-layout/).

source/results/20260917-playground-layout/README.md

@@ -0,0 +1,19 @@
+# Viewport layout verification
+
+The prior page measured 1,378px tall in a 1,440×900 viewport. The replacement
+passes viewport fit, clipping, readable input height and interactions at 13 sizes.
+
+`fixture-layout-verification.json` and screenshots prefixed `fixture-` use an
+isolated browser-test API. Their probability values are fixtures, not model
+outputs. The fixture check covers keyboard tabs, input preservation, loading,
+validation, short answer visibility, long answer scrolling, clipboard, resizing,
+staleness and connection/server errors. Short viewport checks simulate available
+space with a mobile keyboard; they do not test a physical phone keyboard.
+
+`live-layout.json` and screenshots containing `live` use the actual server on
+port 7466 and its three-model catalog. Scoring was blocked in that browser, with
+zero attempted inference calls. `served-assets.json` verifies served file bytes
+and the unchanged backend/training source against the active launch manifest.
+
+The historical real-model inference proof remains in `../20260917-playground/`.
+No training process was changed and no new inference benchmark was performed.

source/results/20260917-playground-layout/baseline-overflow.json

@@ -0,0 +1,11 @@
+{
+  "fixture_only": true,
+  "scope": "Responsive layout and interaction checks; no model inference or training changes.",
+  "started_utc": "2026-09-17T03:50:06.331Z",
+  "viewports": [],
+  "checks": [],
+  "errors": [],
+  "status": "failed",
+  "failure": "AssertionError [ERR_ASSERTION]: 1440x900 initial: vertical page overflow {\"width\":1440,\"height\":900,\"scrollWidth\":1440,\"scrollHeight\":1378,\"bodyWidth\":1440,\"bodyHeight\":1378}\n    at geometry (/home/andy/projects/opensysone/scripts/verify_playground_layout.cjs:71:7)\n    at async main (/home/andy/projects/opensysone/scripts/verify_playground_layout.cjs:106:28)",
+  "finished_utc": "2026-09-17T03:50:06.562Z"
+}

source/results/20260917-playground-layout/fixture-layout-verification.json

@@ -0,0 +1,249 @@
+{
+  "fixture_only": true,
+  "scope": "Responsive layout and interaction checks; no model inference or training changes.",
+  "started_utc": "2026-09-17T03:58:07.314Z",
+  "viewports": [
+    {
+      "width": 1440,
+      "height": 900,
+      "scrollWidth": 1440,
+      "scrollHeight": 900,
+      "bodyWidth": 1440,
+      "bodyHeight": 900,
+      "compact": false,
+      "verified": [
+        "context",
+        "choices",
+        "loading",
+        "results",
+        "validation",
+        "input preservation",
+        "visible controls"
+      ]
+    },
+    {
+      "width": 1366,
+      "height": 768,
+      "scrollWidth": 1366,
+      "scrollHeight": 768,
+      "bodyWidth": 1366,
+      "bodyHeight": 768,
+      "compact": false,
+      "verified": [
+        "context",
+        "choices",
+        "loading",
+        "results",
+        "validation",
+        "input preservation",
+        "visible controls"
+      ]
+    },
+    {
+      "width": 1280,
+      "height": 720,
+      "scrollWidth": 1280,
+      "scrollHeight": 720,
+      "bodyWidth": 1280,
+      "bodyHeight": 720,
+      "compact": false,
+      "verified": [
+        "context",
+        "choices",
+        "loading",
+        "results",
+        "validation",
+        "input preservation",
+        "visible controls"
+      ]
+    },
+    {
+      "width": 1024,
+      "height": 600,
+      "scrollWidth": 1024,
+      "scrollHeight": 600,
+      "bodyWidth": 1024,
+      "bodyHeight": 600,
+      "compact": false,
+      "verified": [
+        "context",
+        "choices",
+        "loading",
+        "results",
+        "validation",
+        "input preservation",
+        "visible controls"
+      ]
+    },
+    {
+      "width": 768,
+      "height": 1024,
+      "scrollWidth": 768,
+      "scrollHeight": 1024,
+      "bodyWidth": 768,
+      "bodyHeight": 1024,
+      "compact": false,
+      "verified": [
+        "context",
+        "choices",
+        "loading",
+        "results",
+        "validation",
+        "input preservation",
+        "visible controls"
+      ]
+    },
+    {
+      "width": 390,
+      "height": 844,
+      "scrollWidth": 390,
+      "scrollHeight": 844,
+      "bodyWidth": 390,
+      "bodyHeight": 844,
+      "compact": true,
+      "verified": [
+        "context",
+        "choices",
+        "loading",
+        "results",
+        "validation",
+        "input preservation",
+        "visible controls"
+      ]
+    },
+    {
+      "width": 375,
+      "height": 667,
+      "scrollWidth": 375,
+      "scrollHeight": 667,
+      "bodyWidth": 375,
+      "bodyHeight": 667,
+      "compact": true,
+      "verified": [
+        "context",
+        "choices",
+        "loading",
+        "results",
+        "validation",
+        "input preservation",
+        "visible controls"
+      ]
+    },
+    {
+      "width": 320,
+      "height": 568,
+      "scrollWidth": 320,
+      "scrollHeight": 568,
+      "bodyWidth": 320,
+      "bodyHeight": 568,
+      "compact": true,
+      "verified": [
+        "context",
+        "choices",
+        "loading",
+        "results",
+        "validation",
+        "input preservation",
+        "visible controls"
+      ]
+    },
+    {
+      "width": 844,
+      "height": 390,
+      "scrollWidth": 844,
+      "scrollHeight": 390,
+      "bodyWidth": 844,
+      "bodyHeight": 390,
+      "compact": true,
+      "verified": [
+        "context",
+        "choices",
+        "loading",
+        "results",
+        "validation",
+        "input preservation",
+        "visible controls"
+      ]
+    },
+    {
+      "width": 667,
+      "height": 375,
+      "scrollWidth": 667,
+      "scrollHeight": 375,
+      "bodyWidth": 667,
+      "bodyHeight": 375,
+      "compact": true,
+      "verified": [
+        "context",
+        "choices",
+        "loading",
+        "results",
+        "validation",
+        "input preservation",
+        "visible controls"
+      ]
+    },
+    {
+      "width": 1024,
+      "height": 420,
+      "scrollWidth": 1024,
+      "scrollHeight": 420,
+      "bodyWidth": 1024,
+      "bodyHeight": 420,
+      "compact": true,
+      "verified": [
+        "context",
+        "choices",
+        "loading",
+        "results",
+        "validation",
+        "input preservation",
+        "visible controls"
+      ]
+    },
+    {
+      "width": 390,
+      "height": 360,
+      "scrollWidth": 390,
+      "scrollHeight": 360,
+      "bodyWidth": 390,
+      "bodyHeight": 360,
+      "compact": true,
+      "verified": [
+        "context",
+        "choices",
+        "loading",
+        "results",
+        "validation",
+        "input preservation",
+        "visible controls"
+      ]
+    },
+    {
+      "width": 320,
+      "height": 420,
+      "scrollWidth": 320,
+      "scrollHeight": 420,
+      "bodyWidth": 320,
+      "bodyHeight": 420,
+      "compact": true,
+      "verified": [
+        "context",
+        "choices",
+        "loading",
+        "results",
+        "validation",
+        "input preservation",
+        "visible controls"
+      ]
+    }
+  ],
+  "checks": [
+    "Tab arrow/Home/End keyboard navigation",
+    "Long answers remain reachable inside results; copy stays visible and exports all 24 options",
+    "Stale results, desktop/mobile resize, server error and model connection retry"
+  ],
+  "errors": [],
+  "status": "passed",
+  "finished_utc": "2026-09-17T03:58:20.298Z"
+}

source/results/20260917-playground-layout/live-layout.json

@@ -0,0 +1,108 @@
+{
+  "checked_utc": "2026-09-17T03:58:50.716Z",
+  "url": "http://127.0.0.1:7466/",
+  "scope": "Actual page and model catalog on the live server; scoring blocked in this browser",
+  "models": [
+    {
+      "id": "gx10-4b",
+      "label": "Qwen3 4B · Main"
+    },
+    {
+      "id": "spark-a-4b",
+      "label": "Qwen3 4B · Lower rate"
+    },
+    {
+      "id": "spark-b-2b",
+      "label": "Qwen3.5 2B"
+    }
+  ],
+  "checks": [
+    {
+      "width": 1366,
+      "height": 768,
+      "context": {
+        "x": 51,
+        "y": 223,
+        "width": 629.046875,
+        "height": 172.078125
+      },
+      "question": {
+        "x": 51,
+        "y": 464.078125,
+        "width": 260.53125,
+        "height": 171.921875
+      },
+      "options": {
+        "x": 327.53125,
+        "y": 464.078125,
+        "width": 352.515625,
+        "height": 171.921875
+      },
+      "dimensions": {
+        "pageWidth": 1366,
+        "pageHeight": 768,
+        "viewportWidth": 1366,
+        "viewportHeight": 768
+      }
+    },
+    {
+      "width": 320,
+      "height": 568,
+      "context": {
+        "x": 19,
+        "y": 302.796875,
+        "width": 282,
+        "height": 159.203125
+      },
+      "question": {
+        "x": 19,
+        "y": 221.796875,
+        "width": 282,
+        "height": 77.4375
+      },
+      "options": {
+        "x": 19,
+        "y": 338.234375,
+        "width": 282,
+        "height": 123.765625
+      },
+      "dimensions": {
+        "pageWidth": 320,
+        "pageHeight": 568,
+        "viewportWidth": 320,
+        "viewportHeight": 568
+      }
+    },
+    {
+      "width": 390,
+      "height": 360,
+      "context": {
+        "x": 25,
+        "y": 181,
+        "width": 340,
+        "height": 105
+      },
+      "question": {
+        "x": 25,
+        "y": 181,
+        "width": 165,
+        "height": 105
+      },
+      "options": {
+        "x": 200,
+        "y": 181,
+        "width": 165,
+        "height": 105
+      },
+      "dimensions": {
+        "pageWidth": 390,
+        "pageHeight": 360,
+        "viewportWidth": 390,
+        "viewportHeight": 360
+      }
+    }
+  ],
+  "score_requests": 0,
+  "errors": [],
+  "status": "passed"
+}

source/results/20260917-playground-layout/served-assets.json

@@ -0,0 +1,20 @@
+{
+  "checked_utc": "2026-09-17T03:59:22.409512+00:00",
+  "runtime": "/home/andy/ai/opensysone/runs/20260917T034059Z-playground-port7466",
+  "backend_pid": 1469393,
+  "backend_source_commit": "2d0ff79e006f8943fc1b8d91dcb17ca2a81c8961",
+  "backend_source_unchanged": [
+    "playground.py",
+    "jev_harness.py",
+    "experiment.py",
+    "training_model.py"
+  ],
+  "frontend_sha256": {
+    "web/playground.html": "dedfed05a7548af47cd7d51d76b730c99e6c4fc89bcc4b8641b4b1f50dfc8537",
+    "web/playground.css": "4cd80320c0218d4e51a1c0193048eacc63dbe62f8b24d0bceef9179e62f34211",
+    "web/playground.js": "bec1dc7195f34af2cf3dd44fe66b2b4d01480a378a7ce0424f69a854393ab009"
+  },
+  "served_bytes_match": true,
+  "cache_control": "no-store",
+  "score_requests": 0
+}

source/scripts/verify_playground.cjs

@@ -32,7 +32,23 @@ async function main() {
     const ids = await page.locator('#model option').evaluateAll(options => options.map(option => option.value));
     assert(ids.length >= 2, 'Expected multiple real models');
     assert.match(await page.locator('#calibration-badge').innerText(), /Uncalibrated/);
+    const revealPane = async (name) => {
+      if (await page.locator('#workspace-tabs').isVisible()) {
+        await page.locator(`#tab-${name}`).click();
+      }
+    };
+    const assertNoDocumentOverflow = async (layout) => {
+      const dimensions = await page.evaluate(() => ({
+        width: document.documentElement.scrollWidth,
+        height: document.documentElement.scrollHeight,
+        viewportWidth: window.innerWidth,
+        viewportHeight: window.innerHeight,
+      }));
+      assert(dimensions.width <= dimensions.viewportWidth, `${layout}: horizontal document overflow`);
+      assert(dimensions.height <= dimensions.viewportHeight, `${layout}: vertical document overflow`);
+    };
     const score = async (model) => {
+      await revealPane('context');
       await page.selectOption('#model', model);
       await page.waitForFunction(() => !document.getElementById('submit').disabled);
       const responsePromise = page.waitForResponse(response =>
@@ -46,6 +62,7 @@ async function main() {
       assert.equal(body.probabilities.length, 3);
       assert(Math.abs(body.probabilities.reduce((sum, row) => sum + row.probability, 0) - 1) < 1e-5);
       assert(body.probabilities.every(row => Number.isFinite(row.probability) && row.probability >= 0));
+      await revealPane('results');
       await page.locator('#results-content').waitFor({ state: 'visible' });
       assert.equal(await page.locator('.probability-item').count(), 3);
       assert.equal(await page.locator('#stale-notice').isVisible(), false);
@@ -54,16 +71,25 @@ async function main() {
     };
     for (const [index, model] of ids.entries()) {
       await score(model);
-      if (!index) await page.screenshot({ path: path.join(output, 'desktop.png'), fullPage: true });
+      if (!index) {
+        await assertNoDocumentOverflow('Desktop');
+        await page.screenshot({ path: path.join(output, 'desktop.png'), fullPage: true });
+      }
     }
     report.checks.push('Real browser scoring and normalized distributions for every configured model');
+    report.checks.push('Desktop layout has no horizontal or vertical document overflow');
+    await revealPane('choices');
     await page.locator('#question').fill('Which choice fits the context best?');
+    await revealPane('results');
     assert.equal(await page.locator('#stale-notice').isVisible(), true);
     report.checks.push('Input edits visibly mark old results as stale');
+    await revealPane('choices');
     await page.locator('#options').fill('Duplicate\nDuplicate');
+    await revealPane('context');
     await page.locator('#submit').click();
     assert.match(await page.locator('#error-message').innerText(), /duplicate|different/i);
     report.checks.push('Duplicate options rejected without scoring');
+    await revealPane('context');
     await page.locator('#reset').click();
     await score(ids[0]);
     await context.grantPermissions(['clipboard-read', 'clipboard-write']);
@@ -83,11 +109,12 @@ async function main() {
     assert.equal(tokenError.body.code, 'token_limit');
     report.checks.push('Actual tokenizer rejects oversized input without truncation');
     await page.setViewportSize({ width: 390, height: 844 });
+    await revealPane('context');
     await page.locator('#reset').click();
     await score(ids[0]);
-    assert(await page.evaluate(() => document.documentElement.scrollWidth <= window.innerWidth));
+    await assertNoDocumentOverflow('Mobile');
     await page.screenshot({ path: path.join(output, 'mobile.png'), fullPage: true });
-    report.checks.push('Mobile layout has no horizontal overflow and real results remain usable');
+    report.checks.push('Mobile layout has no horizontal or vertical document overflow and real results remain usable');
     assert.deepEqual(errors, []);
     report.checks.push('No browser script or Content Security Policy errors');
     report.status = 'passed';

source/scripts/verify_playground_layout.cjs

@@ -0,0 +1,214 @@
+/* Browser layout checks with an isolated fixture API. Never calls a model. */
+const assert = require('node:assert/strict');
+const fs = require('node:fs/promises');
+const http = require('node:http');
+const path = require('node:path');
+const { chromium } = require(process.env.PLAYWRIGHT_MODULE || 'playwright-core');
+
+async function main() {
+  const output = process.argv[2];
+  if (!output || !process.env.CHROMIUM_PATH) throw new Error('Provide a new output directory and CHROMIUM_PATH.');
+  await fs.mkdir(output, { recursive: false });
+  const root = path.resolve(__dirname, '../web');
+  const catalog = [
+    { id: 'fixture-main', label: 'Qwen3 4B · UI fixture', description: 'Browser fixture only; no model inference.', calibrated: false, max_tokens: 1024 },
+    { id: 'fixture-small', label: 'Qwen3.5 2B · UI fixture', description: 'A second browser fixture.', calibrated: true, max_tokens: 1024 },
+  ];
+  let failure = null;
+  let modelFailure = false;
+  let scoreCount = 0;
+  let lastRequest;
+  const server = http.createServer(async (request, response) => {
+    response.setHeader('Content-Security-Policy', "default-src 'self'; script-src 'self'; style-src 'self'; img-src 'self' data:; connect-src 'self'; object-src 'none'; base-uri 'none'; frame-ancestors 'none'");
+    response.setHeader('Cache-Control', 'no-store');
+    const json = (status, body) => {
+      response.writeHead(status, { 'Content-Type': 'application/json' });
+      response.end(JSON.stringify(body));
+    };
+    if (request.url === '/api/models') return modelFailure
+      ? json(503, { error: 'Fixture model connection unavailable. Please retry.' })
+      : json(200, { models: catalog, default_model: catalog[0].id });
+    if (request.url === '/api/status') return json(200, { status: 'ready', loaded_model_id: catalog[0].id });
+    if (request.url === '/api/score') {
+      let raw = '';
+      for await (const chunk of request) raw += chunk;
+      lastRequest = JSON.parse(raw);
+      scoreCount += 1;
+      await new Promise(resolve => setTimeout(resolve, 220));
+      if (failure) return json(failure.status, { error: failure.message });
+      return json(200, {
+        model: catalog.find(model => model.id === lastRequest.model),
+        probabilities: lastRequest.options.map((option, index) => ({ option, probability: index ? .3 / (lastRequest.options.length - 1) : .7 })),
+        elapsed_seconds: .22, input_tokens: 391,
+      });
+    }
+    if (request.url === '/favicon.ico') { response.writeHead(204); return response.end(); }
+    const name = request.url === '/' ? 'playground.html' : request.url.slice(1);
+    if (!['playground.html', 'playground.css', 'playground.js'].includes(name)) { response.writeHead(404); return response.end(); }
+    response.writeHead(200, { 'Content-Type': name.endsWith('.js') ? 'text/javascript' : name.endsWith('.css') ? 'text/css' : 'text/html' });
+    response.end(await fs.readFile(path.join(root, name)));
+  });
+  await new Promise(resolve => server.listen(0, '127.0.0.1', resolve));
+  const url = `http://127.0.0.1:${server.address().port}`;
+  const browser = await chromium.launch({ executablePath: process.env.CHROMIUM_PATH, headless: true, args: ['--disable-gpu', '--no-sandbox'] });
+  const report = { fixture_only: true, scope: 'Responsive layout and interaction checks; no model inference or training changes.', started_utc: new Date().toISOString(), viewports: [], checks: [], errors: [] };
+  try {
+    const context = await browser.newContext({ permissions: ['clipboard-read', 'clipboard-write'], reducedMotion: 'reduce' });
+    const page = await context.newPage();
+    page.on('pageerror', error => report.errors.push(error.message));
+    page.on('console', message => {
+      if (/Content Security Policy|Refused to|violates.*directive/i.test(message.text())) report.errors.push(message.text());
+    });
+    const ready = () => page.waitForFunction(() => !document.getElementById('submit').disabled);
+    const tabs = () => page.locator('#workspace-tabs').isVisible();
+    const view = async name => { if (await tabs()) await page.locator(`#tab-${name}`).click(); };
+    const geometry = async label => {
+      const measured = await page.evaluate(() => {
+        const root = document.documentElement;
+        return { width: innerWidth, height: innerHeight, scrollWidth: root.scrollWidth, scrollHeight: root.scrollHeight, bodyWidth: document.body.scrollWidth, bodyHeight: document.body.scrollHeight };
+      });
+      assert(measured.scrollWidth <= measured.width + 1 && measured.bodyWidth <= measured.width + 1, `${label}: horizontal overflow ${JSON.stringify(measured)}`);
+      assert(measured.scrollHeight <= measured.height + 1 && measured.bodyHeight <= measured.height + 1, `${label}: vertical page overflow ${JSON.stringify(measured)}`);
+      const scroll = await page.evaluate(() => { window.scrollTo(200, 200); return { x: scrollX, y: scrollY }; });
+      assert.deepEqual(scroll, { x: 0, y: 0 }, `${label}: page can scroll`);
+      return measured;
+    };
+    const inView = async (selector, label) => {
+      const result = await page.locator(selector).evaluate(element => {
+        const box = element.getBoundingClientRect();
+        let clip = { left: 0, top: 0, right: innerWidth, bottom: innerHeight };
+        for (let parent = element.parentElement; parent; parent = parent.parentElement) {
+          const style = getComputedStyle(parent), parentBox = parent.getBoundingClientRect();
+          if (/(auto|scroll|hidden|clip)/.test(style.overflowX)) { clip.left = Math.max(clip.left, parentBox.left); clip.right = Math.min(clip.right, parentBox.right); }
+          if (/(auto|scroll|hidden|clip)/.test(style.overflowY)) { clip.top = Math.max(clip.top, parentBox.top); clip.bottom = Math.min(clip.bottom, parentBox.bottom); }
+        }
+        const style = getComputedStyle(element);
+        const minimumHeight = element.tagName === 'TEXTAREA' ? ['lineHeight', 'paddingTop', 'paddingBottom', 'borderTopWidth', 'borderBottomWidth'].reduce((sum, property) => sum + parseFloat(style[property]), 0) : 0;
+        return { x: box.x, y: box.y, width: box.width, height: box.height, minimumHeight, visible: box.width > 0 && box.height > 0 && box.left >= clip.left - 1 && box.right <= clip.right + 1 && box.top >= clip.top - 1 && box.bottom <= clip.bottom + 1 };
+      });
+      assert(result.visible, `${label}: ${selector} clipped or hidden ${JSON.stringify(result)}`);
+      assert(result.height >= result.minimumHeight - 1, `${label}: ${selector} has less than one readable line ${JSON.stringify(result)}`);
+      return result;
+    };
+    const score = async () => {
+      await ready();
+      await inView('#submit', 'Submit available');
+      await page.locator('#submit').click();
+      await page.locator('#loading-state').waitFor({ state: 'visible' });
+      await geometry('Loading');
+      await page.locator('#results-content').waitFor({ state: 'visible' });
+      await ready();
+    };
+
+    for (const [width, height] of [[1440, 900], [1366, 768], [1280, 720], [1024, 600], [768, 1024], [390, 844], [375, 667], [320, 568], [844, 390], [667, 375], [1024, 420], [390, 360], [320, 420]]) {
+      const label = `${width}x${height}`;
+      await page.setViewportSize({ width, height });
+      await page.goto(url);
+      await ready();
+      const compact = await tabs();
+      const measurements = await geometry(`${label} initial`);
+      await inView('#model', label);
+      await inView('#calibration-badge', label);
+      await inView('#context', label);
+      await inView('#submit', label);
+      await page.locator('#context').fill('An invented context. '.repeat(90));
+      await view('choices');
+      await inView('#question', label);
+      await inView('#options', label);
+      await inView('#submit', label);
+      await page.locator('#question').fill('Which option fits?');
+      await page.locator('#options').fill('First option\nSecond option\nThird option');
+      await geometry(`${label} choices`);
+      if (['1366x768', '320x568', '844x390'].includes(label)) {
+        await page.screenshot({ path: path.join(output, `${label}-choices.png`) });
+        await view('context');
+        await page.screenshot({ path: path.join(output, `${label}-context.png`) });
+        await view('choices');
+      }
+      await score();
+      await geometry(`${label} results`);
+      await inView('#copy-results', label);
+      assert.equal(await page.locator('.probability-item').count(), 3);
+      if (height >= 568) {
+        for (let index = 1; index <= 3; index += 1) await inView(`.probability-item:nth-child(${index})`, `${label} short answer list`);
+      }
+      assert.equal(lastRequest.options.length, 3);
+      if (compact) assert.equal(await page.locator('#tab-results').getAttribute('aria-selected'), 'true');
+      if (['1366x768', '390x844', '320x568', '844x390'].includes(label)) await page.screenshot({ path: path.join(output, `${label}-results.png`) });
+      await view('choices');
+      assert.equal(await page.locator('#question').inputValue(), 'Which option fits?');
+      await page.locator('#options').fill('Duplicate\nDuplicate');
+      const before = scoreCount;
+      await page.locator('#submit').click();
+      await inView('#error-message', label);
+      await inView('#submit', label);
+      await inView('#options', `${label} invalid options remain editable`);
+      await geometry(`${label} validation`);
+      assert.equal(scoreCount, before, 'Invalid input must not send a score request');
+      report.viewports.push({ ...measurements, compact, verified: ['context', 'choices', 'loading', 'results', 'validation', 'input preservation', 'visible controls'] });
+    }
+
+    await page.setViewportSize({ width: 390, height: 844 });
+    await page.reload(); await ready();
+    if (await tabs()) {
+      await page.locator('#tab-context').focus();
+      await page.keyboard.press('ArrowRight');
+      assert.equal(await page.locator('#tab-choices').getAttribute('aria-selected'), 'true');
+      await page.keyboard.press('End');
+      assert.equal(await page.locator('#tab-results').getAttribute('aria-selected'), 'true');
+      await page.keyboard.press('Home');
+      assert.equal(await page.locator('#tab-context').getAttribute('aria-selected'), 'true');
+      report.checks.push('Tab arrow/Home/End keyboard navigation');
+    }
+    await view('choices');
+    const answers = Array.from({ length: 24 }, (_, i) => `${i + 1}. A longer invented answer ${'with enough detail to wrap on a small screen. '.repeat(3)}`);
+    await page.locator('#options').fill(answers.join('\n'));
+    await score(); await geometry('Long results');
+    await inView('#copy-results', 'Long results');
+    await page.locator('#copy-results').click();
+    await page.waitForFunction(() => document.getElementById('copy-label').textContent === 'Copied');
+    const copied = JSON.parse(await page.evaluate(() => navigator.clipboard.readText()));
+    assert.equal(copied.probabilities.length, 24);
+    await page.locator('.probability-item').last().scrollIntoViewIfNeeded();
+    await geometry('Last result is reachable without page scrolling');
+    await inView('#copy-results', 'After internal result scrolling');
+    report.checks.push('Long answers remain reachable inside results; copy stays visible and exports all 24 options');
+    await view('context');
+    await page.locator('#context').fill('Changed context');
+    await view('results');
+    await inView('#stale-notice', 'Stale notice');
+    await geometry('Stale results');
+    await page.setViewportSize({ width: 1366, height: 768 });
+    await inView('#context', 'Resize to desktop');
+    await inView('#options', 'Resize to desktop');
+    await inView('#copy-results', 'Resize to desktop');
+    await geometry('Desktop resize');
+    await page.setViewportSize({ width: 320, height: 568 });
+    await view('choices');
+    failure = { status: 422, message: 'The complete prompt exceeds the supported token limit. Shorten the context or options before retrying.' };
+    await page.locator('#submit').click();
+    await page.waitForFunction(() => !document.getElementById('error-message').hidden);
+    await geometry('Server error'); await inView('#submit', 'Server error'); await inView('#error-message', 'Server error');
+    failure = null;
+    modelFailure = true;
+    await page.reload();
+    await page.locator('#retry-models').waitFor({ state: 'visible' });
+    await geometry('Connection error'); await inView('#retry-models', 'Connection retry');
+    modelFailure = false;
+    await page.locator('#retry-models').click(); await ready();
+    report.checks.push('Stale results, desktop/mobile resize, server error and model connection retry');
+    assert.deepEqual(report.errors, []);
+    report.status = 'passed';
+  } catch (error) {
+    report.status = 'failed';
+    report.failure = error.stack;
+    process.exitCode = 1;
+  } finally {
+    report.finished_utc = new Date().toISOString();
+    await fs.writeFile(path.join(output, 'layout-verification.json'), JSON.stringify(report, null, 2) + '\n');
+    await browser.close();
+    await new Promise(resolve => server.close(resolve));
+  }
+  console.log(JSON.stringify({ status: report.status, viewports: report.viewports.length, failure: report.failure, output }));
+}
+main().catch(error => { console.error(error); process.exitCode = 1; });

source/web/playground.css

@@ -16,171 +16,252 @@
   color: var(--ink);
   background: var(--paper);
 }
-
 * { box-sizing: border-box; }
-body { margin: 0; }
+html, body { width: 100%; height: 100%; margin: 0; overflow: hidden; }
 button, input, textarea, select { font: inherit; }
 button, select { cursor: pointer; }
 button { -webkit-tap-highlight-color: transparent; }
 button:disabled, select:disabled { cursor: default; }
 button:disabled { opacity: .48; }
-button, a, textarea, select { outline-offset: 4px; }
+button, a, textarea, select { outline-offset: 2px; }
 :focus-visible { outline: 2px solid var(--green); }
 button, a { touch-action: manipulation; }
 [hidden] { display: none !important; }
 svg { flex-shrink: 0; }
 a { color: inherit; }
-.page-shell { width: min(1260px, calc(100% - 96px)); margin: 0 auto; }
-.site-header { height: 100px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
-.wordmark { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-size: 19px; font-weight: 650; letter-spacing: -.7px; }
-.brand-mark { width: 27px; height: 27px; color: var(--green); }
-.connection { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--muted); }
-.status-dot { width: 6px; height: 6px; border-radius: 50%; background: #a4a79b; }
+.page-shell { width: min(1440px, 100%); height: 100vh; height: 100dvh; padding: 0 28px 20px; margin: 0 auto; display: flex; flex-direction: column; }
+.site-header { min-height: 60px; flex: 0 0 60px; display: flex; align-items: center; justify-content: space-between; gap: 16px; border-bottom: 1px solid var(--line); }
+.brand-group { display: flex; align-items: center; gap: 20px; min-width: 0; }
+.wordmark { display: inline-flex; align-items: center; gap: 9px; text-decoration: none; font-size: 18px; font-weight: 650; letter-spacing: -.7px; white-space: nowrap; }
+.brand-mark { width: 25px; height: 25px; color: var(--green); }
+h1 { margin: 0; padding-left: 20px; border-left: 1px solid var(--line); font-family: Georgia, "Times New Roman", serif; font-size: 22px; font-weight: 400; letter-spacing: -.65px; }
+.connection { display: flex; align-items: center; gap: 8px; font-size: 11px; color: var(--muted); min-width: 0; }
+#connection-text { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.status-dot { width: 6px; height: 6px; flex: 0 0 6px; border-radius: 50%; background: #a4a79b; }
 .connection[data-state="ready"] .status-dot { background: var(--green); box-shadow: 0 0 0 4px #285c4610; }
 .connection[data-state="busy"] .status-dot { background: #ae7c2c; animation: breathe 1.8s ease-in-out infinite; }
 .connection[data-state="error"] .status-dot { background: var(--error); }
-.intro { display: grid; grid-template-columns: 1.3fr 1fr; align-items: center; gap: 72px; padding: 56px 0 48px; }
-.eyebrow { margin: 0 0 18px; font-size: 11px; font-weight: 650; text-transform: uppercase; letter-spacing: 2px; color: var(--green); }
-h1 { margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(38px, 4.3vw, 57px); line-height: 1.08; font-weight: 400; letter-spacing: -2px; }
-.intro-description { margin: 21px 0 0; color: var(--muted); font-size: 15px; line-height: 1.65; }
-.model-panel { padding: 4px 0 0 27px; border-left: 1px solid var(--line); }
-.field-label { display: block; margin-bottom: 10px; font-size: 13px; font-weight: 650; letter-spacing: -.1px; }
-.select-wrap { position: relative; }
-.select-wrap svg { pointer-events: none; position: absolute; right: 15px; top: 17px; width: 18px; height: 18px; color: var(--green); }
-select { appearance: none; -webkit-appearance: none; width: 100%; min-height: 52px; padding: 13px 41px 13px 15px; border: 1px solid #cdd3c7; border-radius: 8px; background: var(--surface); color: var(--ink); font-weight: 550; font-size: 14px; text-overflow: ellipsis; }
+main { display: flex; flex-direction: column; flex: 1; min-height: 0; min-width: 0; }
+.model-toolbar { display: flex; flex: 0 0 auto; align-items: center; gap: 24px; padding: 14px 0; min-width: 0; }
+.model-picker { display: flex; align-items: center; gap: 12px; min-width: 0; flex: 0 1 410px; }
+.field-label { display: block; font-size: 12px; font-weight: 650; letter-spacing: -.1px; flex-shrink: 0; }
+.select-wrap { position: relative; min-width: 0; flex: 1; }
+.select-wrap svg { pointer-events: none; position: absolute; right: 12px; top: 13px; width: 18px; height: 18px; color: var(--green); }
+select { appearance: none; -webkit-appearance: none; width: 100%; min-height: 44px; padding: 10px 37px 10px 12px; border: 1px solid #cdd3c7; border-radius: 7px; background: var(--surface); color: var(--ink); font-weight: 550; font-size: 14px; text-overflow: ellipsis; }
 select:disabled { color: var(--muted); }
-.model-description { min-height: 36px; margin: 11px 0 12px; font-size: 12px; line-height: 1.55; color: var(--muted); }
-.model-details { display: flex; gap: 10px 12px; align-items: center; flex-wrap: wrap; min-height: 25px; }
-.calibration-badge { color: #775b30; background: #eee6d6; border: 1px solid #e2d8c5; border-radius: 4px; padding: 4px 7px; font-size: 10px; line-height: 1.2; font-weight: 600; }
+.model-info { min-width: 0; flex: 1; }
+.model-description { margin: 0 0 5px; font-size: 11px; line-height: 1.4; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
+.model-details { display: flex; gap: 8px 12px; align-items: center; flex-wrap: wrap; }
+.calibration-badge { color: #775b30; background: #eee6d6; border: 1px solid #e2d8c5; border-radius: 4px; padding: 4px 6px; font-size: 10px; line-height: 1.2; font-weight: 600; white-space: nowrap; }
 .calibration-badge[data-calibrated="true"] { background: #e4ecdf; color: var(--green); border-color: #d3e0cb; }
-.model-limit { font-size: 11px; color: var(--muted); }
-.retry-button { margin-top: 12px; }
-.workspace { display: grid; grid-template-columns: 1.06fr 1fr; border: 1px solid #d6dbce; border-radius: 14px; overflow: hidden; background: var(--surface); box-shadow: 0 6px 32px #283b2710; }
-.editor-panel, .results-panel { min-width: 0; padding: 30px; }
-.results-panel { border-left: 1px solid #d6dbce; background: var(--sage); display: flex; flex-direction: column; }
-.panel-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 26px; margin-bottom: 25px; }
-h2 { margin: 0; font-size: 16px; font-weight: 650; letter-spacing: -.35px; }
-.text-button { border: 0; padding: 3px 0; background: transparent; color: var(--green); font-size: 12px; line-height: 1.6; text-decoration-thickness: 1px; text-underline-offset: 3px; }
-.text-button:hover:not(:disabled) { text-decoration: underline; }
-.examples { margin-bottom: 27px; }
-.example-label { display: block; font-size: 11px; color: var(--muted); margin-bottom: 10px; }
-.example-buttons { display: flex; flex-wrap: wrap; gap: 7px; }
-.example-button { padding: 7px 10px; border: 1px solid #dce0d5; border-radius: 5px; background: transparent; color: #5b655b; font-size: 11px; line-height: 1.35; transition: background .15s, border-color .15s; }
+.model-limit { font-size: 10px; color: var(--muted); white-space: nowrap; }
+.retry-button { flex-shrink: 0; }
+.workspace-form { flex: 1; min-height: 0; display: flex; }
+.workspace { width: 100%; min-width: 0; min-height: 0; display: grid; grid-template-columns: 1.06fr 1fr; grid-template-rows: minmax(0, 1fr) auto; grid-template-areas: "editor results" "actions results"; border: 1px solid #d6dbce; border-radius: 12px; background: var(--surface); box-shadow: 0 6px 32px #283b2710; }
+.editor-panel { grid-area: editor; padding: 20px 22px 12px; min-width: 0; min-height: 0; }
+.editor-views { height: 100%; min-width: 0; min-height: 0; display: grid; grid-template-rows: minmax(0, 1.2fr) minmax(0, 1fr); gap: 20px; }
+.input-view { min-width: 0; min-height: 0; }
+.context-view { display: flex; flex-direction: column; gap: 8px; }
+.label-row { display: flex; justify-content: space-between; align-items: center; gap: 8px; min-height: 18px; flex-shrink: 0; }
+.label-row .field-hint { margin: 0; font-size: 10px; flex-shrink: 0; }
+.next-choices { display: none; }
+.examples { display: flex; align-items: center; gap: 10px; min-width: 0; flex-shrink: 0; }
+.example-label { font-size: 10px; color: var(--muted); }
+.example-buttons { display: flex; gap: 6px; min-width: 0; overflow-x: auto; scrollbar-width: thin; padding: 2px; }
+.example-button { flex-shrink: 0; min-height: 32px; padding: 6px 8px; border: 1px solid #dce0d5; border-radius: 5px; background: transparent; color: #5b655b; font-size: 10px; line-height: 1.35; transition: background .15s, border-color .15s; }
 .example-button:hover:not(:disabled) { background: #f0f2eb; border-color: #aebca7; }
 .example-button[aria-pressed="true"] { color: var(--green-dark); border-color: #a9bda0; background: #e9efdf; }
-.field-group { margin-bottom: 22px; }
-.label-row { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
-.label-row .field-hint { margin: 0; font-size: 10px; flex-shrink: 0; }
-textarea { display: block; width: 100%; border: 1px solid #dce0d5; border-radius: 7px; padding: 13px 14px; color: #384238; background: #fbfcf7; line-height: 1.6; font-size: 13px; resize: vertical; min-height: 80px; transition: border-color .15s, background .15s; }
+textarea { display: block; width: 100%; flex: 1 1 0; min-width: 0; min-height: 0; border: 1px solid #dce0d5; border-radius: 7px; padding: 11px 12px; color: #384238; background: #fbfcf7; line-height: 1.55; font-size: 14px; resize: none; overflow: auto; transition: border-color .15s, background .15s; overscroll-behavior: contain; }
 textarea:hover { border-color: #bac5b3; }
 textarea:focus { border-color: var(--green); background: #fffefa; }
 textarea[readonly] { color: #687166; background: #f3f5ee; }
 textarea[aria-invalid="true"] { border-color: var(--error); }
 textarea::placeholder { color: #8b9289; }
-#context { min-height: 185px; }
-.question-input { min-height: 71px; }
-.options-input { min-height: 118px; line-height: 1.85; }
-.field-hint { margin: 8px 0 0; font-size: 11px; line-height: 1.55; color: var(--muted); }
-.options-group { margin-bottom: 25px; }
-.error-message { margin: -3px 0 18px; border: 1px solid #e5c9bd; border-radius: 6px; padding: 12px 13px; color: var(--error); background: #fcf0e9; font-size: 12px; line-height: 1.55; overflow-wrap: anywhere; }
-.form-actions { display: flex; gap: 20px; align-items: center; }
-.primary-button { display: inline-flex; justify-content: center; align-items: center; gap: 17px; min-height: 48px; border: 1px solid var(--green); border-radius: 6px; padding: 12px 19px; background: var(--green); color: #fffefa; font-size: 13px; font-weight: 550; box-shadow: 0 2px 0 #1a392716; transition: background .15s, transform .15s; }
-.primary-button:hover:not(:disabled) { background: var(--green-dark); transform: translateY(-1px); }
-.primary-button:active:not(:disabled) { transform: translateY(0); }
+.field-hint { margin: 0; font-size: 10px; line-height: 1.5; color: var(--muted); flex-shrink: 0; }
+.choices-view { display: grid; grid-template-columns: .85fr 1.15fr; gap: 16px; }
+.field-group { display: flex; flex-direction: column; gap: 8px; min-width: 0; min-height: 0; }
+.field-group > .field-label { min-height: 18px; display: flex; align-items: center; }
+.question-group { padding-bottom: 23px; }
+.options-input { line-height: 1.7; }
+.action-dock { grid-area: actions; min-width: 0; padding: 12px 22px 18px; }
+.error-message { max-height: 64px; overflow: auto; overscroll-behavior: contain; margin: 0 0 9px; border: 1px solid #e5c9bd; border-radius: 6px; padding: 8px 10px; color: var(--error); background: #fcf0e9; font-size: 12px; line-height: 1.4; overflow-wrap: anywhere; }
+.form-actions { display: flex; gap: 12px; align-items: center; min-width: 0; }
+.primary-button { display: inline-flex; flex: 1; justify-content: center; align-items: center; gap: 12px; min-width: 0; min-height: 46px; border: 1px solid var(--green); border-radius: 6px; padding: 10px 13px; background: var(--green); color: #fffefa; font-size: 13px; font-weight: 550; box-shadow: 0 2px 0 #1a392716; transition: background .15s; }
+.primary-button:hover:not(:disabled) { background: var(--green-dark); }
 .primary-button:disabled { opacity: .56; }
 .primary-button svg { width: 17px; height: 17px; }
-.button-spinner { display: none; width: 14px; height: 14px; border: 1.5px solid #ffffff55; border-top-color: white; border-radius: 50%; animation: spin .8s linear infinite; }
+.button-spinner { display: none; width: 14px; height: 14px; border: 1.5px solid #ffffff55; border-top-color: white; border-radius: 50%; animation: spin .8s linear infinite; flex-shrink: 0; }
 .primary-button[data-loading="true"] .button-spinner { display: block; }
 .primary-button[data-loading="true"] .submit-arrow { display: none; }
 .keyboard-hint { color: #687360; font-size: 10px; white-space: nowrap; }
 kbd { font-family: inherit; }
-.editor-footnote { margin-top: 24px; padding-top: 17px; border-top: 1px solid #e8eade; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; font-size: 10px; color: #687360; line-height: 1.5; }
-.editor-footnote .text-button { font-size: 10px; }
-.results-count { color: #617053; font-size: 11px; }
-.empty-state, .loading-state { margin: auto 0; padding: 65px 15px 100px; text-align: center; }
-.empty-state h3, .loading-state h3 { margin: 25px 0 12px; font-family: Georgia, "Times New Roman", serif; font-size: 24px; font-weight: 400; letter-spacing: -.65px; }
-.empty-state p, .loading-state p { margin: 0; color: #64705d; font-size: 12px; line-height: 1.8; }
-.empty-mark { display: flex; align-items: center; justify-content: center; gap: 7px; width: 83px; height: 83px; margin: 0 auto; border: 1px solid #d3ddc8; border-radius: 50%; background: #e6ecdd; }
+.text-button { flex-shrink: 0; min-height: 44px; border: 0; padding: 6px 3px; background: transparent; color: var(--green); font-size: 12px; line-height: 1.4; text-decoration-thickness: 1px; text-underline-offset: 3px; }
+.text-button:hover:not(:disabled) { text-decoration: underline; }
+.results-panel { grid-area: results; min-width: 0; min-height: 0; padding: 20px 24px 16px; border-left: 1px solid #d6dbce; border-radius: 0 11px 11px 0; background: var(--sage); display: flex; flex-direction: column; }
+.panel-heading { display: flex; flex-shrink: 0; align-items: center; justify-content: space-between; gap: 12px; min-height: 24px; margin-bottom: 18px; }
+h2 { margin: 0; font-size: 15px; font-weight: 650; letter-spacing: -.35px; }
+.results-count { color: #617053; font-size: 10px; white-space: nowrap; }
+.empty-state, .loading-state { flex: 1; min-height: 0; overflow: auto; display: flex; flex-direction: column; justify-content: safe center; align-items: center; padding: 12px 0; text-align: center; }
+.empty-state h3, .loading-state h3 { margin: 20px 0 10px; font-family: Georgia, "Times New Roman", serif; font-size: 25px; font-weight: 400; letter-spacing: -.65px; }
+.empty-state p, .loading-state p { margin: 0; color: #64705d; font-size: 12px; line-height: 1.75; }
+.empty-mark { display: flex; flex-shrink: 0; align-items: center; justify-content: center; gap: 7px; width: 68px; height: 68px; border: 1px solid #d3ddc8; border-radius: 50%; background: #e6ecdd; }
 .empty-mark span { width: 6px; height: 6px; background: #9bac8b; border-radius: 50%; }
 .empty-mark span:nth-child(2) { width: 8px; height: 8px; background: #6c885c; }
-.loading-orbit { width: 54px; height: 54px; margin: 0 auto; border-radius: 50%; border: 1px solid #c8d5bd; border-top: 2px solid var(--green); animation: spin 1.3s linear infinite; }
-.elapsed-timer { display: inline-block; margin-top: 21px; color: var(--green); font-size: 12px; font-variant-numeric: tabular-nums; }
-.results-content { padding-top: 3px; }
-.result-question { font-family: Georgia, "Times New Roman", serif; font-size: 24px; line-height: 1.35; letter-spacing: -.55px; margin: 0 0 32px; overflow-wrap: anywhere; }
-.stale-notice { margin: -14px 0 25px; border-left: 2px solid #a8b897; padding-left: 10px; font-size: 11px; color: #69795d; line-height: 1.5; }
+.loading-orbit { width: 42px; height: 42px; flex-shrink: 0; border-radius: 50%; border: 1px solid #c8d5bd; border-top: 2px solid var(--green); animation: spin 1.3s linear infinite; }
+.elapsed-timer { display: inline-block; margin-top: 12px; color: var(--green); font-size: 12px; font-variant-numeric: tabular-nums; }
+.results-content { display: flex; flex-direction: column; flex: 1; min-height: 0; min-width: 0; }
+.results-scroll { flex: 1; min-height: 0; min-width: 0; overflow: auto; overscroll-behavior: contain; padding: 3px 4px 0 0; scrollbar-width: thin; scrollbar-color: #a5b997 transparent; }
+.result-question { font-family: Georgia, "Times New Roman", serif; font-size: 25px; line-height: 1.3; letter-spacing: -.55px; margin: 0 0 24px; overflow-wrap: anywhere; }
+.stale-notice { flex-shrink: 0; margin: 0 0 10px; border-left: 2px solid #a8b897; padding-left: 10px; font-size: 11px; color: #69795d; line-height: 1.5; }
 .probability-list { margin: 0; padding: 0; list-style: none; }
-.probability-item { margin-bottom: 25px; }
-.probability-row { display: grid; grid-template-columns: 22px minmax(0, 1fr) auto; align-items: baseline; column-gap: 9px; margin-bottom: 10px; }
+.probability-item { margin-bottom: 22px; }
+.probability-row { display: grid; grid-template-columns: 22px minmax(0, 1fr) auto; align-items: baseline; column-gap: 9px; margin-bottom: 8px; }
 .option-index { font-size: 9px; font-weight: 600; color: #65735a; letter-spacing: .6px; }
 .option-text { color: #54614c; font-size: 13px; line-height: 1.6; overflow-wrap: anywhere; white-space: pre-wrap; }
 .option-probability { font-size: 17px; letter-spacing: -.4px; font-weight: 550; color: #607151; font-variant-numeric: tabular-nums; }
 .probability-item:first-child .option-text { color: var(--green-dark); font-weight: 600; }
 .probability-item:first-child .option-probability { color: var(--green-dark); font-size: 23px; font-weight: 600; }
-.probability-track { margin-left: 31px; height: 9px; background: #dee5d5; border-radius: 2px; overflow: hidden; }
+.probability-track { margin-left: 31px; height: 8px; background: #dee5d5; border-radius: 2px; overflow: hidden; }
 .probability-fill { height: 100%; background: #a5b997; border-radius: 2px; transition: width .45s ease-out; }
 .probability-item:first-child .probability-fill { background: var(--green); }
-.probability-note { font-size: 10px; line-height: 1.7; color: #65735a; margin: 33px 0 28px; }
-.result-footer { padding-top: 20px; border-top: 1px solid #d6dfcd; display: flex; align-items: center; justify-content: space-between; gap: 15px; }
-.result-metadata { display: flex; flex-direction: column; gap: 6px; font-size: 10px; color: #606e56; line-height: 1.5; min-width: 0; }
-.result-model { color: #52634a; font-weight: 550; overflow-wrap: anywhere; }
-.copy-button { flex-shrink: 0; display: flex; align-items: center; gap: 5px; padding: 7px 9px; background: transparent; border: 1px solid #cbd7be; border-radius: 5px; color: #596d4d; font-size: 10px; }
+.probability-note { font-size: 10px; line-height: 1.6; color: #65735a; margin: 20px 0 15px; }
+.result-footer { flex-shrink: 0; min-width: 0; padding-top: 10px; border-top: 1px solid #d6dfcd; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
+.result-metadata { display: flex; flex-direction: column; gap: 3px; font-size: 10px; color: #606e56; line-height: 1.5; min-width: 0; }
+.result-metadata span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.result-model { color: #52634a; font-weight: 550; }
+.copy-button { flex-shrink: 0; min-height: 44px; display: flex; align-items: center; gap: 5px; padding: 8px 10px; background: transparent; border: 1px solid #cbd7be; border-radius: 5px; color: #596d4d; font-size: 11px; }
 .copy-button:hover { background: #e2ead9; }
 .copy-button svg { width: 15px; height: 15px; }
-.site-footer { display: flex; justify-content: space-between; gap: 20px; padding: 24px 0 36px; font-size: 10px; color: #687360; letter-spacing: .1px; }
-.site-footer span:first-child { font-weight: 600; }
+.workspace-tabs { grid-area: tabs; display: flex; border-bottom: 1px solid var(--line); padding: 0 8px; }
+.workspace-tabs button { flex: 1; min-width: 0; min-height: 44px; background: transparent; color: var(--muted); border: 0; border-bottom: 2px solid transparent; font-size: 13px; font-weight: 600; }
+.workspace-tabs button[aria-selected="true"] { color: var(--green-dark); border-bottom-color: var(--green); }
 .skip-link { position: fixed; z-index: 10; left: 15px; top: -80px; padding: 12px 16px; color: white; background: var(--green); border-radius: 5px; }
 .skip-link:not(:focus) { clip-path: inset(50%); clip: rect(0, 0, 0, 0); width: 1px; height: 1px; padding: 0; overflow: hidden; white-space: nowrap; }
 .skip-link:focus { top: 15px; }
 .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
-.noscript-message { margin: 25px auto; max-width: 600px; text-align: center; color: var(--error); }
-
+.noscript-message { position: fixed; bottom: 10px; left: 10px; right: 10px; background: var(--surface); padding: 12px; text-align: center; color: var(--error); }
 @keyframes spin { to { transform: rotate(360deg); } }
 @keyframes breathe { 50% { opacity: .35; } }
-@media (min-width: 1450px) { .intro { padding-top: 64px; padding-bottom: 54px; } }
-@media (max-width: 1000px) {
-  .page-shell { width: calc(100% - 56px); }
-  .intro { gap: 35px; grid-template-columns: 1.1fr 1fr; }
-  .editor-panel, .results-panel { padding: 24px; }
-  .keyboard-hint { display: none; }
-  .model-panel { padding-left: 23px; }
-  .result-footer { flex-wrap: wrap; }
+@media (max-width: 1150px) {
+  .page-shell { padding: 0 18px 16px; }
+  .keyboard-hint, .example-label { display: none; }
+  .editor-panel { padding: 16px 16px 10px; }
+  .action-dock { padding: 10px 16px 14px; }
+  .results-panel { padding: 16px 18px 14px; }
+  .editor-views { gap: 16px; }
+  .choices-view { gap: 10px; }
+  .options-group .label-row { flex-wrap: wrap; gap: 2px 6px; }
 }
-@media (max-width: 760px) {
-  .page-shell { width: calc(100% - 36px); max-width: 600px; }
-  .site-header { height: 77px; }
-  .wordmark { font-size: 17px; }
-  .intro { display: block; padding: 35px 0 29px; }
-  h1 { font-size: 43px; letter-spacing: -1.7px; }
-  .eyebrow { font-size: 10px; margin-bottom: 15px; }
-  .intro-description { font-size: 14px; margin-top: 17px; }
-  .model-panel { margin-top: 26px; padding: 0; border: 0; }
-  .model-description { min-height: 0; }
-  .workspace { grid-template-columns: 1fr; border-radius: 10px; }
-  .editor-panel, .results-panel { padding: 23px 20px; }
-  .results-panel { border-left: 0; border-top: 1px solid #d6dbce; min-height: 340px; }
-  .empty-state, .loading-state { padding: 36px 10px 46px; }
-  .empty-mark { height: 65px; width: 65px; }
-  .empty-state h3, .loading-state h3 { margin-top: 21px; }
-  .form-actions { display: block; }
-  .primary-button { width: 100%; min-height: 49px; }
-  textarea { font-size: 16px; }
-  .question-input { min-height: 81px; }
-  .options-input { min-height: 137px; }
-  select { font-size: 16px; }
-  .text-button { min-height: 32px; }
-  .example-button { padding: 10px; }
-  .copy-button { min-height: 36px; padding: 8px 11px; }
-  .result-question { margin-top: 3px; font-size: 23px; }
-  .site-footer { padding-bottom: 25px; }
+@media (max-width: 760px), (max-height: 520px) {
+  .page-shell { padding: 0 12px 10px; }
+  .site-header { flex-basis: 48px; min-height: 48px; }
+  .brand-group { gap: 12px; }
+  .wordmark { font-size: 16px; }
+  .brand-mark { width: 22px; height: 22px; }
+  h1 { font-size: 18px; padding-left: 12px; }
+  .model-toolbar { gap: 10px; padding: 9px 0; flex-wrap: wrap; }
+  .model-picker { flex: 1 1 100%; gap: 9px; }
+  .model-info { flex: 1; }
+  select, textarea { font-size: 16px; }
+  .model-description { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
+  .model-details { gap: 8px; }
+  .model-limit { font-size: 10px; }
+  .retry-button { min-height: 32px; }
+  .workspace { grid-template-columns: minmax(0, 1fr); grid-template-rows: auto minmax(0, 1fr) auto; grid-template-areas: "tabs" "content" "actions"; border-radius: 9px; }
+  .editor-panel, .results-panel { grid-area: content; padding: 10px 12px; }
+  .editor-panel { display: flex; }
+  .workspace[data-active-view="results"] .editor-panel { display: none; }
+  .editor-views { flex: 1; display: flex; min-height: 0; }
+  .input-view { flex: 1; }
+  .context-view { gap: 7px; }
+  .context-view > .label-row { min-height: 30px; }
+  .next-choices { display: block; min-height: 44px; margin: 0; }
+  .example-buttons { width: 100%; gap: 5px; }
+  .example-button { min-height: 44px; font-size: 11px; }
+  .choices-view { grid-template-columns: minmax(0, 1fr); grid-template-rows: minmax(0, .75fr) minmax(0, 1.25fr); gap: 14px; }
+  .question-group { padding-bottom: 0; }
+  .options-group .label-row { flex-wrap: nowrap; }
+  .field-group { gap: 7px; }
+  textarea { padding: 9px 10px; }
+  .action-dock { padding: 8px 12px 10px; border-top: 1px solid #e8eade; }
+  .form-actions { gap: 8px; }
+  .form-actions .text-button { min-width: 44px; }
+  .primary-button { min-height: 44px; gap: 8px; padding: 9px 10px; }
+  .primary-button .submit-arrow { display: none; }
+  .results-panel { border-left: 0; border-radius: 0; }
+  .panel-heading { min-height: 20px; margin-bottom: 10px; }
+  .result-question { font-size: 23px; margin-bottom: 20px; }
+  .result-footer { padding-top: 8px; }
+  .error-message { max-height: 56px; margin-bottom: 7px; font-size: 11px; }
+  .empty-state h3, .loading-state h3 { font-size: 23px; }
 }
-@media (max-width: 380px) {
-  .page-shell { width: calc(100% - 24px); }
-  h1 { font-size: 38px; }
-  .editor-panel, .results-panel { padding: 20px 16px; }
+@media (max-width: 430px) {
+  h1 { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
   .connection { font-size: 10px; }
-  .example-button { font-size: 10px; padding: 9px 8px; }
+}
+@media (max-width: 350px) {
+  .page-shell { padding-left: 8px; padding-right: 8px; }
+  .editor-panel, .results-panel { padding-left: 10px; padding-right: 10px; }
+  .action-dock { padding-left: 10px; padding-right: 10px; }
+  .calibration-badge { font-size: 9px; padding: 4px 5px; }
+  .model-limit { font-size: 9px; }
   .label-row .field-hint { font-size: 9px; }
-  .desktop-break { display: none; }
+  .example-button { padding-left: 7px; padding-right: 7px; font-size: 10px; }
+  .result-question { font-size: 21px; }
+  .option-probability { font-size: 15px; }
+  .probability-item:first-child .option-probability { font-size: 20px; }
+}
+@media (max-width: 760px) and (max-height: 700px) {
+  .result-question { font-size: 20px; line-height: 1.3; margin-bottom: 12px; }
+  .probability-item { margin-bottom: 12px; }
+  .probability-item:last-child { margin-bottom: 0; }
+  .probability-row { margin-bottom: 6px; }
+  .probability-track { height: 6px; }
+  .probability-note { margin: 8px 0 0; line-height: 1.4; }
+}
+@media (max-width: 599px) and (max-height: 520px) {
+  .page-shell { padding-bottom: 8px; }
+  .site-header { min-height: 22px; flex-basis: 22px; justify-content: flex-end; border-bottom: 0; }
+  .brand-group, .examples, #context-hint, #options-hint, #option-count, .next-choices { display: none; }
+  .model-toolbar { gap: 6px; padding: 4px 0; }
+  .editor-panel, .results-panel { padding-top: 8px; padding-bottom: 8px; }
+  .context-view > .label-row { min-height: 18px; }
+  .choices-view { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); grid-template-rows: minmax(0, 1fr); gap: 10px; }
+  .action-dock { padding-top: 6px; padding-bottom: 6px; }
+  .error-message { max-height: 42px; margin-bottom: 5px; padding: 5px 8px; }
+  .empty-mark, .loading-orbit { display: none; }
+  .empty-state, .loading-state { padding: 0; }
+  .empty-state h3, .loading-state h3 { margin: 4px 0; font-size: 21px; }
+  .elapsed-timer { margin-top: 5px; }
+  .panel-heading { margin-bottom: 7px; }
+}
+@media (max-height: 520px) and (min-width: 600px) {
+  .page-shell { padding-bottom: 8px; }
+  .site-header { min-height: 42px; flex-basis: 42px; }
+  .model-toolbar { flex-wrap: nowrap; gap: 14px; padding: 7px 0; }
+  .model-picker { flex: 1 1 55%; }
+  .model-info { flex: 1 1 45%; }
+  .model-details { flex-wrap: nowrap; gap: 7px; }
+  .workspace-tabs button { min-height: 44px; }
+  .editor-panel, .results-panel { padding-top: 8px; padding-bottom: 8px; }
+  .context-view { display: grid; grid-template-columns: minmax(0, 1fr) auto; grid-template-rows: auto minmax(0, 1fr); gap: 6px 16px; }
+  .context-view > .label-row { min-height: 44px; }
+  .examples { grid-column: 2; grid-row: 1; }
+  #context { grid-column: 1 / -1; grid-row: 2; height: 100%; }
+  #context-hint { display: none; }
+  .choices-view { grid-template-columns: .85fr 1.15fr; grid-template-rows: minmax(0, 1fr); gap: 16px; }
+  .question-group { padding-bottom: 22px; }
+  .action-dock { padding-top: 6px; padding-bottom: 6px; }
+  .primary-button { flex: 0 1 300px; }
+  .keyboard-hint { display: inline; margin-right: auto; }
+  .error-message { max-height: 42px; padding: 5px 8px; margin-bottom: 5px; }
+  .empty-state, .loading-state { padding: 0; }
+  .empty-mark, .loading-orbit { display: none; }
+  .empty-state h3, .loading-state h3 { margin: 4px 0; font-size: 21px; }
+  .empty-state p, .loading-state p { font-size: 11px; }
+  .elapsed-timer { margin-top: 5px; }
+  .panel-heading { margin-bottom: 7px; }
+  .result-question { font-size: 21px; margin-bottom: 16px; }
 }
 @media (prefers-reduced-motion: reduce) {
   *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }

source/web/playground.html

@@ -2,7 +2,7 @@
 <html lang="en">
 <head>
   <meta charset="utf-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <meta name="viewport" content="width=device-width, initial-scale=1, interactive-widget=resizes-content">
   <meta name="theme-color" content="#f5f3ed">
   <meta name="description" content="Give OpenSysOne a context, a question and possible answers. Explore the probabilities it assigns to each choice.">
   <title>Model playground · OpenSysOne</title>
@@ -13,134 +13,108 @@
   <a class="skip-link" href="#context">Skip to the playground</a>
   <div class="page-shell">
     <header class="site-header">
-      <a class="wordmark" href="/" aria-label="OpenSysOne playground home">
-        <svg class="brand-mark" viewBox="0 0 28 28" fill="none" aria-hidden="true"><path d="M5 7h18M5 14h12M5 21h6" stroke="currentColor" stroke-width="4" stroke-linecap="round"/></svg>
-        <span>OpenSysOne</span>
-      </a>
-      <div class="connection" id="connection" data-state="connecting" role="status">
-        <span class="status-dot" aria-hidden="true"></span>
-        <span id="connection-text">Connecting</span>
+      <div class="brand-group">
+        <a class="wordmark" href="/" aria-label="OpenSysOne playground home">
+          <svg class="brand-mark" viewBox="0 0 28 28" fill="none" aria-hidden="true"><path d="M5 7h18M5 14h12M5 21h6" stroke="currentColor" stroke-width="4" stroke-linecap="round"/></svg>
+          <span>OpenSysOne</span>
+        </a>
+        <h1 id="page-title">Playground</h1>
       </div>
+      <div class="connection" id="connection" data-state="connecting" role="status"><span class="status-dot" aria-hidden="true"></span><span id="connection-text">Connecting</span></div>
     </header>
-
-    <main>
-      <section class="intro" aria-labelledby="page-title">
-        <div class="intro-copy">
-          <p class="eyebrow">Model playground</p>
-          <h1 id="page-title">A little context.<br>A clearer choice.</h1>
-          <p class="intro-description">Give the model a question and possible answers.<br class="desktop-break"> See how it weighs each one.</p>
-        </div>
-        <div class="model-panel">
-          <label class="field-label" for="model">Choose a model</label>
+    <main aria-labelledby="page-title">
+      <div class="model-toolbar">
+        <div class="model-picker">
+          <label class="field-label" for="model">Model</label>
           <div class="select-wrap">
-            <select id="model" name="model" disabled aria-describedby="model-description model-limit">
-              <option value="">Loading available models…</option>
-            </select>
+            <select id="model" name="model" disabled aria-describedby="model-description model-limit"><option value="">Loading available models…</option></select>
             <svg viewBox="0 0 20 20" fill="none" aria-hidden="true"><path d="m6 8 4 4 4-4" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"/></svg>
           </div>
+        </div>
+        <div class="model-info">
           <p class="model-description" id="model-description">Finding available checkpoints.</p>
-          <div class="model-details">
-            <span class="calibration-badge" id="calibration-badge" hidden></span>
-            <span id="model-limit" class="model-limit"></span>
-          </div>
-          <button class="text-button retry-button" id="retry-models" type="button" hidden>Retry connection <span aria-hidden="true">↗</span></button>
+          <div class="model-details"><span class="calibration-badge" id="calibration-badge" hidden></span><span id="model-limit" class="model-limit"></span></div>
         </div>
-      </section>
-
-      <div class="workspace">
-        <section class="editor-panel" aria-labelledby="editor-title">
-          <div class="panel-heading">
-            <h2 id="editor-title">Your decision</h2>
-            <button type="button" class="text-button" id="clear">Clear</button>
+        <button class="text-button retry-button" id="retry-models" type="button" hidden>Retry connection</button>
+      </div>
+      <form id="decision-form" class="workspace-form" novalidate>
+        <div class="workspace" id="workspace" data-active-view="context">
+          <div class="workspace-tabs" id="workspace-tabs" role="tablist" aria-label="Playground workspace" hidden>
+            <button type="button" id="tab-context" role="tab" aria-controls="view-context" aria-selected="true" tabindex="0">Context</button>
+            <button type="button" id="tab-choices" role="tab" aria-controls="view-choices" aria-selected="false" tabindex="-1">Choices</button>
+            <button type="button" id="tab-results" role="tab" aria-controls="results-panel" aria-selected="false" tabindex="-1">Results</button>
           </div>
-          <div class="examples" aria-label="Try an example">
-            <span class="example-label">Try an example</span>
-            <div class="example-buttons">
-              <button type="button" class="example-button" data-example="0" aria-pressed="true">Weekend plans</button>
-              <button type="button" class="example-button" data-example="1" aria-pressed="false">Parcel handoff</button>
-              <button type="button" class="example-button" data-example="2" aria-pressed="false">Studio booking</button>
+          <section class="editor-panel" aria-labelledby="editor-title">
+            <h2 id="editor-title" class="sr-only">Your decision</h2>
+            <div class="editor-views">
+              <section class="input-view context-view" id="view-context" aria-labelledby="context-label">
+                <div class="label-row">
+                  <label class="field-label" id="context-label" for="context">Context</label>
+                  <span class="field-hint" id="context-count">0 characters</span>
+                  <button type="button" class="text-button next-choices" id="next-choices">Choices <span aria-hidden="true">→</span></button>
+                </div>
+                <div class="examples" aria-label="Try an invented example">
+                  <span class="example-label">Examples</span>
+                  <div class="example-buttons">
+                    <button type="button" class="example-button" data-example="0" aria-pressed="true">Weekend plans</button>
+                    <button type="button" class="example-button" data-example="1" aria-pressed="false">Parcel handoff</button>
+                    <button type="button" class="example-button" data-example="2" aria-pressed="false">Studio booking</button>
+                  </div>
+                </div>
+                <textarea id="context" name="context" rows="7" placeholder="Add the information the model should use…" aria-describedby="context-hint context-count" required>Ari and Noor are planning Saturday afternoon. Rain is forecast from noon onward. They want an indoor activity, enjoy art, and have a small budget. The city gallery has a free exhibition open until 6 pm. The hiking trail has no shelter, and the rooftop restaurant is expensive.</textarea>
+                <p class="field-hint" id="context-hint">Use your own words, or adapt an invented example.</p>
+              </section>
+              <section class="input-view choices-view" id="view-choices" aria-labelledby="choices-title">
+                <h2 class="sr-only" id="choices-title">Question and possible answers</h2>
+                <div class="field-group question-group">
+                  <label class="field-label" for="question">Question</label>
+                  <textarea class="question-input" id="question" name="question" rows="2" placeholder="What would you like the model to decide?" required>Which plan best fits their preferences?</textarea>
+                </div>
+                <div class="field-group options-group">
+                  <div class="label-row"><label class="field-label" for="options">Possible answers</label><span class="field-hint" id="option-count">3 options</span></div>
+                  <textarea class="options-input" id="options" name="options" rows="4" placeholder="First answer&#10;Second answer&#10;Another possibility" aria-describedby="options-hint option-count" required>Visit the free art gallery
+Take a long hike
+Book a rooftop lunch</textarea>
+                  <p class="field-hint" id="options-hint">One per line. At least two distinct answers.</p>
+                </div>
+              </section>
             </div>
-          </div>
-
-          <form id="decision-form" novalidate>
-            <div class="field-group">
-              <div class="label-row">
-                <label class="field-label" for="context">Context</label>
-                <span class="field-hint" id="context-count">0 characters</span>
-              </div>
-              <textarea id="context" name="context" rows="7" placeholder="Add the information the model should use…" aria-describedby="context-hint context-count" required>Ari and Noor are planning Saturday afternoon. Rain is forecast from noon onward. They want an indoor activity, enjoy art, and have a small budget. The city gallery has a free exhibition open until 6 pm. The hiking trail has no shelter, and the rooftop restaurant is expensive.</textarea>
-              <p class="field-hint" id="context-hint">A situation, a message, a few facts — use your own words.</p>
+          </section>
+          <section class="results-panel" id="results-panel" aria-labelledby="results-title" aria-busy="false">
+            <div class="panel-heading"><h2 id="results-title" tabindex="-1">Probabilities</h2><span class="results-count" id="results-count" hidden></span></div>
+            <div class="empty-state" id="empty-state">
+              <div class="empty-mark" aria-hidden="true"><span></span><span></span><span></span></div>
+              <h3>Room for every possibility.</h3><p>Run the example, or make it your own.<br>Your results will appear here.</p>
             </div>
-            <div class="field-group">
-              <label class="field-label" for="question">Question</label>
-              <textarea class="question-input" id="question" name="question" rows="2" placeholder="What would you like the model to decide?" required>Which plan best fits their preferences?</textarea>
+            <div class="loading-state" id="loading-state" hidden>
+              <div class="loading-orbit" aria-hidden="true"></div><h3 id="loading-title">Weighing the options</h3><p id="loading-detail">The model is reading your context.</p><span class="elapsed-timer" id="elapsed-timer" aria-hidden="true">0.0 s</span>
             </div>
-            <div class="field-group options-group">
-              <div class="label-row">
-                <label class="field-label" for="options">Possible answers</label>
-                <span class="field-hint" id="option-count">3 options</span>
+            <div class="results-content" id="results-content" hidden>
+              <p class="stale-notice" id="stale-notice" role="status" hidden>Inputs changed. Run again to update these results.</p>
+              <div class="results-scroll" id="results-scroll" tabindex="0" role="region" aria-label="Ranked answers">
+                <p class="result-question" id="result-question"></p>
+                <ol class="probability-list" id="probability-list" aria-label="Answers ranked by probability"></ol>
+                <p class="probability-note">Probabilities are relative to the answers you provide.</p>
+              </div>
+              <div class="result-footer">
+                <div class="result-metadata"><span class="result-model" id="result-model"></span><span id="result-timing"></span></div>
+                <button class="copy-button" id="copy-results" type="button"><svg viewBox="0 0 18 18" fill="none" aria-hidden="true"><rect x="6" y="6" width="8" height="9" rx="1.5" stroke="currentColor" stroke-width="1.3"/><path d="M4 12H3.5A1.5 1.5 0 0 1 2 10.5v-7A1.5 1.5 0 0 1 3.5 2h6A1.5 1.5 0 0 1 11 3.5V4" stroke="currentColor" stroke-width="1.3"/></svg><span id="copy-label">Copy JSON</span></button>
               </div>
-              <textarea class="options-input" id="options" name="options" rows="4" placeholder="First answer&#10;Second answer&#10;Another possibility" aria-describedby="options-hint option-count" required>Visit the free art gallery
-Take a long hike
-Book a rooftop lunch</textarea>
-              <p class="field-hint" id="options-hint">One answer per line. Include at least two distinct options.</p>
             </div>
-            <div class="error-message" id="error-message" role="alert" hidden></div>
+            <p class="sr-only" id="result-announcement" role="status" aria-live="polite" aria-atomic="true"></p>
+          </section>
+          <div class="action-dock">
+            <div class="error-message" id="error-message" role="alert" tabindex="0" hidden></div>
             <div class="form-actions">
-              <button class="primary-button" id="submit" type="submit" disabled>
-                <span class="button-spinner" aria-hidden="true"></span>
-                <span id="submit-label">Get probabilities</span>
-                <svg class="submit-arrow" viewBox="0 0 20 20" fill="none" aria-hidden="true"><path d="M4 10h12m-5-5 5 5-5 5" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"/></svg>
-              </button>
+              <button class="primary-button" id="submit" type="submit" disabled><span class="button-spinner" aria-hidden="true"></span><span id="submit-label">Get probabilities</span><svg class="submit-arrow" viewBox="0 0 20 20" fill="none" aria-hidden="true"><path d="M4 10h12m-5-5 5 5-5 5" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"/></svg></button>
               <span class="keyboard-hint" id="keyboard-hint"><kbd>Ctrl</kbd> + <kbd>Enter</kbd></span>
+              <button type="button" class="text-button" id="clear">Clear</button>
+              <button type="button" class="text-button" id="reset" aria-label="Reset example" title="Reset example">Reset</button>
             </div>
-          </form>
-          <div class="editor-footnote">
-            <span>Examples are invented. Make them your own.</span>
-            <button type="button" class="text-button" id="reset">Reset example</button>
-          </div>
-        </section>
-
-        <section class="results-panel" id="results-panel" aria-labelledby="results-title" aria-busy="false">
-          <div class="panel-heading">
-            <h2 id="results-title">Probabilities</h2>
-            <span class="results-count" id="results-count" hidden></span>
-          </div>
-
-          <div class="empty-state" id="empty-state">
-            <div class="empty-mark" aria-hidden="true"><span></span><span></span><span></span></div>
-            <h3>Room for every possibility.</h3>
-            <p>Your results will appear here.<br>Run the example, or make it your own.</p>
           </div>
-
-          <div class="loading-state" id="loading-state" hidden>
-            <div class="loading-orbit" aria-hidden="true"></div>
-            <h3 id="loading-title">Weighing the options</h3>
-            <p id="loading-detail">The model is reading your context.</p>
-            <span class="elapsed-timer" id="elapsed-timer" aria-hidden="true">0.0 s</span>
-          </div>
-
-          <div class="results-content" id="results-content" hidden>
-            <p class="result-question" id="result-question"></p>
-            <p class="stale-notice" id="stale-notice" role="status" hidden>Inputs changed. Run again to update these results.</p>
-            <ol class="probability-list" id="probability-list" aria-label="Answers ranked by probability"></ol>
-            <p class="probability-note">Probabilities are relative to the answers you provide.</p>
-            <div class="result-footer">
-              <div class="result-metadata">
-                <span class="result-model" id="result-model"></span>
-                <span id="result-timing"></span>
-              </div>
-              <button class="copy-button" id="copy-results" type="button">
-                <svg viewBox="0 0 18 18" fill="none" aria-hidden="true"><rect x="6" y="6" width="8" height="9" rx="1.5" stroke="currentColor" stroke-width="1.3"/><path d="M4 12H3.5A1.5 1.5 0 0 1 2 10.5v-7A1.5 1.5 0 0 1 3.5 2h6A1.5 1.5 0 0 1 11 3.5V4" stroke="currentColor" stroke-width="1.3"/></svg>
-                <span id="copy-label">Copy JSON</span>
-              </button>
-            </div>
-          </div>
-          <p class="sr-only" id="result-announcement" role="status" aria-live="polite" aria-atomic="true"></p>
-        </section>
-      </div>
+        </div>
+      </form>
     </main>
-    <footer class="site-footer"><span>OpenSysOne</span><span>Context in. Possibilities out.</span></footer>
   </div>
   <noscript><p class="noscript-message">Enable JavaScript to load models and get probabilities.</p></noscript>
 </body>

source/web/playground.js

@@ -34,6 +34,38 @@
   let requestStarted = 0;
   const fields = [$("context"), $("question"), $("options")];
   const exampleButtons = Array.from(document.querySelectorAll("[data-example]"));
+  const compactLayout = window.matchMedia("(max-width: 760px), (max-height: 520px)");
+  const views = ["context", "choices", "results"];
+  const panels = { context: $("view-context"), choices: $("view-choices"), results: $("results-panel") };
+  const panelLabels = { context: "context-label", choices: "choices-title", results: "results-title" };
+  let activeView = "context";
+
+  function activateView(view, focusTab = false) {
+    const focusedView = views.find((name) => panels[name].contains(document.activeElement));
+    activeView = view;
+    $("workspace").dataset.activeView = view;
+    $("workspace-tabs").hidden = !compactLayout.matches;
+    views.forEach((name) => {
+      const tab = $(`tab-${name}`);
+      tab.setAttribute("aria-selected", String(name === view));
+      tab.tabIndex = name === view ? 0 : -1;
+      panels[name].hidden = compactLayout.matches && name !== view;
+      panels[name].setAttribute("role", compactLayout.matches ? "tabpanel" : "region");
+      panels[name].setAttribute("aria-labelledby", compactLayout.matches ? `tab-${name}` : panelLabels[name]);
+    });
+    if (compactLayout.matches && (focusTab || (focusedView && focusedView !== view))) {
+      $(`tab-${view}`).focus({ preventScroll: true });
+    }
+  }
+
+  function syncLayout() {
+    const focused = document.activeElement;
+    const focusedView = views.find((name) => panels[name].contains(focused));
+    activateView(focusedView || activeView);
+    if (!compactLayout.matches && $("workspace-tabs").contains(focused)) {
+      ({ context: $("context"), choices: $("question"), results: $("results-title") })[activeView].focus({ preventScroll: true });
+    }
+  }
 
   function optionsFromInput() {
     return $("options").value.split(/\r?\n/).map((option) => option.trim()).filter(Boolean);
@@ -60,8 +92,9 @@
     $("error-message").hidden = !message;
     fields.forEach((input) => input.removeAttribute("aria-invalid"));
     if (field) {
+      activateView(field.id === "context" ? "context" : "choices");
       field.setAttribute("aria-invalid", "true");
-      field.focus();
+      field.focus({ preventScroll: true });
     }
   }
 
@@ -123,6 +156,7 @@
     setError("");
     clearResults();
     updateCounts();
+    activateView("context");
   }
 
   async function jsonRequest(url, options = {}, timeout = 15000) {
@@ -137,6 +171,7 @@
       if (!response.ok) {
         const error = new Error(typeof body.error === "string" ? body.error : `The request failed (${response.status}). Please try again.`);
         error.status = response.status;
+        error.code = body.code;
         throw error;
       }
       return body;
@@ -306,12 +341,15 @@
     $("results-count").textContent = `${ranked.length} options · ranked`;
     $("results-count").hidden = false;
     $("result-model").textContent = body.model.label;
+    $("result-model").title = body.model.label;
     const metadata = [];
     if (Number.isFinite(body.elapsed_seconds)) metadata.push(`${body.elapsed_seconds.toFixed(2)} s`);
     if (Number.isFinite(body.input_tokens)) metadata.push(`${body.input_tokens.toLocaleString()} input tokens`);
     $("result-timing").textContent = metadata.join(" · ");
     $("results-content").hidden = false;
     $("empty-state").hidden = true;
+    activateView("results");
+    $("results-scroll").scrollTop = 0;
     updateStaleness();
     $("result-announcement").textContent = `Results ready. Highest probability: ${ranked[0].option}, ${percentage(ranked[0].probability)}. ${ranked.length} options ranked.`;
   }
@@ -324,6 +362,7 @@
     if (!request.text) { setError("Add some context for the model to read.", $("context")); return; }
     if (!request.question) { setError("Add the question you want the model to answer.", $("question")); return; }
     if (request.options.length < 2) { setError("Add at least two possible answers, one per line.", $("options")); return; }
+    if (request.options.length > 255) { setError("Use no more than 255 possible answers.", $("options")); return; }
     if (new Set(request.options).size !== request.options.length) { setError("Each possible answer should be different. Remove any duplicate lines.", $("options")); return; }
     setError("");
     scoring = true;
@@ -342,12 +381,7 @@
     elapsedTimer = setInterval(tick, 100);
     syncControls();
     connection("Scoring", "busy");
-    if (window.matchMedia("(max-width: 760px)").matches) {
-      $("results-panel").scrollIntoView({
-        behavior: window.matchMedia("(prefers-reduced-motion: reduce)").matches ? "auto" : "smooth",
-        block: "start",
-      });
-    }
+    activateView("results");
     void pollStatus();
     try {
       const body = await jsonRequest("/api/score", {
@@ -356,7 +390,8 @@
       validateResponse(body, request);
       renderResults(body, request);
     } catch (error) {
-      setError(error.message);
+      const field = error.code === "token_limit" ? $("context") : error.code === "invalid_options" ? $("options") : null;
+      setError(error.message, field);
       if (error.status === 503) backendBusy = true;
       $("results-content").hidden = !lastResponse;
       $("results-count").hidden = !lastResponse;
@@ -389,7 +424,7 @@
       field.select();
       try { copied = document.execCommand("copy"); } catch { copied = false; }
       field.remove();
-      $("copy-results").focus();
+      $("copy-results").focus({ preventScroll: true });
     }
     $("copy-label").textContent = copied ? "Copied" : "Copy unavailable";
     $("result-announcement").textContent = copied ? "Results JSON copied to the clipboard." : "Clipboard access is unavailable in this browser.";
@@ -409,8 +444,31 @@
     if (scoring) return;
     fields.forEach((input) => { input.value = ""; });
     exampleButtons.forEach((button) => button.setAttribute("aria-pressed", "false"));
-    setError(""); clearResults(); updateCounts(); $("context").focus();
+    setError(""); clearResults(); updateCounts(); activateView("context"); $("context").focus({ preventScroll: true });
+  });
+  views.forEach((view, index) => {
+    $(`tab-${view}`).addEventListener("click", () => activateView(view));
+    $(`tab-${view}`).addEventListener("keydown", (event) => {
+      let next;
+      if (event.key === "ArrowRight") next = (index + 1) % views.length;
+      else if (event.key === "ArrowLeft") next = (index + views.length - 1) % views.length;
+      else if (event.key === "Home") next = 0;
+      else if (event.key === "End") next = views.length - 1;
+      else return;
+      event.preventDefault();
+      activateView(views[next], true);
+    });
+  });
+  $("next-choices").addEventListener("click", () => {
+    activateView("choices");
+    $("question").focus({ preventScroll: true });
+  });
+  document.querySelector(".skip-link").addEventListener("click", (event) => {
+    event.preventDefault();
+    activateView("context");
+    $("context").focus({ preventScroll: true });
   });
+  compactLayout.addEventListener("change", syncLayout);
   $("retry-models").addEventListener("click", loadModels);
   $("copy-results").addEventListener("click", copyResults);
   document.addEventListener("keydown", (event) => {

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+  "archive_size": 1986591,
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+    },
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+      "size": 13851
+    },
+    "FLEET_SCOUT.md": {
+      "sha256": "789b020758a2713c74003f7d8d7af2d099c348d786c58c54136738a7ddcf7285",
+      "size": 8383
+    },
+    "HANDOVER.md": {
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+      "size": 20729
+    },
+    "HF_MODEL_CARD.md": {
+      "sha256": "217a55e4c411423f93e12286c2b424d2ad886c3c5ae7f3092248bd08503dda5a",
+      "size": 6161
+    },
+    "HUGGINGFACE.md": {
+      "sha256": "521ae9303dfc69b65ba570811814c758434565e0b8057da97a135dcb5d7aab05",
+      "size": 5610
+    },
+    "JEV_HARNESS.md": {
+      "sha256": "c0f4a0d9055689b6a8be6fb66aadb43ed448609002618dd4d7e3857808c5e88b",
+      "size": 4683
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