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+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
+  <title>Chem Inventory (SQLite + PubChem)</title>
+  <style>
+    :root { --bg:#0f1115; --panel:#171923; --text:#e6e6e6; --muted:#9aa0a6; --accent:#7aa2f7; }
+    * { box-sizing:border-box; font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial, "Apple Color Emoji", "Segoe UI Emoji"; }
+    body { margin:0; background:var(--bg); color:var(--text); }
+    header { padding:12px 16px; background:#11131a; border-bottom:1px solid #232634; display:flex; gap:12px; align-items:center; flex-wrap:wrap; }
+    header h1 { margin:0; font-size:18px; font-weight:650; letter-spacing:.3px; }
+    header .spacer { flex:1; }
+    main { display:grid; grid-template-columns:360px 1fr; gap:16px; padding:16px; }
+    @media (max-width: 900px) { main { grid-template-columns:1fr; } }
+    .card { background:var(--panel); border:1px solid #232634; border-radius:14px; padding:14px; }
+    .card h2 { margin:0 0 10px; font-size:15px; font-weight:650; color:#d2d5de; }
+    .row { display:grid; grid-template-columns:1fr 1fr; gap:8px; }
+    .row3 { display:grid; grid-template-columns:1fr 1fr 1fr; gap:8px; }
+    label { font-size:12px; color:var(--muted); margin-bottom:4px; display:block; }
+    input[type="text"], input[type="number"], select, textarea { width:100%; padding:10px; border-radius:10px; border:1px solid #2a2f3a; background:#11131a; color:var(--text); }
+    textarea { min-height:70px; }
+    button { padding:10px 12px; border-radius:10px; border:1px solid #2a2f3a; background:#11131a; color:var(--text); cursor:pointer; }
+    button.primary { background:var(--accent); border-color:#6486df; color:#0b1021; font-weight:650; }
+    button.ghost { opacity:.9; }
+    button:disabled { opacity:.5; cursor:not-allowed; }
+    .toolbar { display:flex; gap:8px; flex-wrap:wrap; align-items:center; }
+    .muted { color:var(--muted); font-size:12px; }
+    table { width:100%; border-collapse:collapse; }
+    th, td { padding:8px 10px; border-bottom:1px solid #232634; font-size:13px; vertical-align:top; }
+    th { text-align:left; color:#c9ccd6; position:sticky; top:0; background:var(--panel); z-index:1; }
+    tr:hover td { background:#131726; }
+    .pill { padding:2px 8px; border-radius:999px; background:#1f2433; border:1px solid #2a2f3a; font-size:12px; }
+    .right { text-align:right; }
+    .status { font-size:12px; }
+    .ok { color:#a5d6a7; }
+    .bad { color:#ffcdd2; }
+    .warn { color:#ffe082; }
+    .kbd { background:#22273a; padding:2px 6px; border:1px solid #2a2f3a; border-radius:6px; font-family: ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace; font-size:12px; }
+  </style>
+  <!-- sql.js: SQLite compiled to WASM. No SRI to avoid false mismatches. -->
+  <script src="https://cdnjs.cloudflare.com/ajax/libs/sql.js/1.10.2/sql-wasm.js"></script>
+</head>
+<body>
+  <header>
+    <h1>Chem Inventory</h1>
+    <span class="muted">Fast entry now, enrich later.</span>
+    <div class="spacer"></div>
+    <div class="toolbar">
+      <button id="bulkBtn" title="Fill missing CAS/Name for all items">Bulk Lookup Missing</button>
+      <button id="exportDbBtn" title="Download the SQLite .db file">Export DB</button>
+      <button id="exportCsvBtn" title="Download CSV export">Export CSV</button>
+      <label class="kbd" for="importDb">Import DB</label>
+      <input id="importDb" type="file" accept=".db,.sqlite,application/octet-stream" style="display:none" />
+    </div>
+  </header>
+  <main>
+    <section class="card" id="entryCard">
+      <h2>New entry</h2>
+      <div class="row">
+        <div>
+          <label for="cas">CAS</label>
+          <input id="cas" type="text" placeholder="e.g. 64-17-5" autocomplete="off" />
+        </div>
+        <div>
+          <label for="name">Name</label>
+          <input id="name" type="text" placeholder="e.g. Ethanol" autocomplete="off" />
+        </div>
+      </div>
+      <div class="row3" style="margin-top:8px">
+        <div>
+          <label for="qty">Quantity</label>
+          <input id="qty" type="number" step="0.01" placeholder="e.g. 500" />
+        </div>
+        <div>
+          <label for="unit">Unit</label>
+          <select id="unit">
+            <option value="g">g</option>
+            <option value="mg">mg</option>
+            <option value="kg">kg</option>
+            <option value="mL" selected>mL</option>
+            <option value="L">L</option>
+          </select>
+        </div>
+        <div>
+          <label for="container">Container</label>
+          <select id="container">
+            <option value="glass" selected>glass</option>
+            <option value="plastic">plastic</option>
+            <option value="metal">metal</option>
+            <option value="other">other</option>
+          </select>
+        </div>
+      </div>
+      <div style="margin-top:8px">
+        <label for="notes">Notes</label>
+        <textarea id="notes" placeholder="Label state, purity, supplier, hazards, storage, etc."></textarea>
+      </div>
+      <div class="toolbar" style="margin-top:10px">
+        <button id="addBtn" class="primary" title="Enter (Ctrl+Enter)">Add</button>
+        <button id="lookupBtn" class="ghost" title="On-demand lookup via PubChem">Lookup (PubChem)</button>
+        <label><input type="checkbox" id="autoLookup" /> Auto‑lookup on blur</label>
+        <span id="status" class="status muted"></span>
+      </div>
+      <p class="muted" style="margin-top:10px">
+        Shortcuts: <span class="kbd">Enter</span> to add, <span class="kbd">Ctrl+Enter</span> to add and keep focus, <span class="kbd">/</span> focuses CAS, <span class="kbd">,</span> focuses Name.
+      </p>
+    </section>
+
+    <section class="card">
+      <h2>Inventory</h2>
+      <div class="toolbar" style="margin-bottom:8px">
+        <input type="text" id="search" placeholder="Filter by CAS or name" />
+        <button id="clearBtn">Clear</button>
+      </div>
+      <div style="overflow:auto; max-height: 70vh;">
+        <table id="table">
+          <thead><tr>
+            <th>#</th>
+            <th>CAS</th>
+            <th>Name</th>
+            <th class="right">Qty</th>
+            <th>Unit</th>
+            <th>Container</th>
+            <th>Notes</th>
+            <th></th>
+          </tr></thead>
+          <tbody></tbody>
+        </table>
+      </div>
+    </section>
+  </main>
+
+  <script>
+    // Persistent DB in IndexedDB via sql.js
+    // Schema: items(id INTEGER PK, cas TEXT, name TEXT, qty REAL, unit TEXT, container TEXT, notes TEXT, created_at TEXT)
+
+    let SQL;           // sql.js module
+    let db;            // Database instance
+    const DB_KEY = 'chem_inventory_sqlite';
+
+    const $ = (id) => document.getElementById(id);
+    const status = (msg, cls = 'muted') => {
+      const s = $("status"); s.className = `status ${cls}`; s.textContent = msg;
+      if (msg) setTimeout(() => { if ($("status").textContent === msg) status(''); }, 4000);
+    };
+
+    // Small helpers
+    const sleep = (ms) => new Promise(r => setTimeout(r, ms));
+    const CAS_RE = /^\d{2,7}-\d{2}-\d$/;
+    const normCas = (x) => (x||'').replace(/\s+/g,'').trim();
+    const pickCAS = (arr) => (arr||[]).find(x => CAS_RE.test(x)) || (arr&&arr[0]) || '';
+
+    async function init() {
+      SQL = await initSqlJs({ locateFile: file => `https://cdnjs.cloudflare.com/ajax/libs/sql.js/1.10.2/${file}` });
+      const saved = localStorage.getItem(DB_KEY);
+      if (saved) {
+        const u8 = Uint8Array.from(atob(saved), c => c.charCodeAt(0));
+        db = new SQL.Database(u8);
+      } else {
+        db = new SQL.Database();
+        db.run(`CREATE TABLE IF NOT EXISTS items (
+          id INTEGER PRIMARY KEY AUTOINCREMENT,
+          cas TEXT,
+          name TEXT,
+          qty REAL,
+          unit TEXT,
+          container TEXT,
+          notes TEXT,
+          created_at TEXT
+        );
+        CREATE INDEX IF NOT EXISTS idx_items_cas ON items(cas);
+        CREATE INDEX IF NOT EXISTS idx_items_name ON items(name);`);
+        persist();
+      }
+      render();
+    }
+
+    function persist() {
+      const data = db.export();
+      const b64 = btoa(Array.from(data).map(b => String.fromCharCode(b)).join(""));
+      localStorage.setItem(DB_KEY, b64);
+    }
+
+    function addItem(rec) {
+      const stmt = db.prepare(`INSERT INTO items (cas,name,qty,unit,container,notes,created_at) VALUES (?,?,?,?,?,?,?)`);
+      stmt.run([
+        rec.cas || null,
+        rec.name || null,
+        rec.qty != null && rec.qty !== '' ? Number(rec.qty) : null,
+        rec.unit || null,
+        rec.container || null,
+        rec.notes || null,
+        new Date().toISOString()
+      ]);
+      stmt.free();
+      persist();
+      render();
+    }
+
+    function updateItem(id, fields) {
+      const keys = Object.keys(fields);
+      if (!keys.length) return;
+      const set = keys.map(k => `${k} = ?`).join(', ');
+      const params = keys.map(k => fields[k]);
+      params.push(id);
+      db.run(`UPDATE items SET ${set} WHERE id = ?`, params);
+      persist();
+    }
+
+    function deleteItem(id) {
+      db.run(`DELETE FROM items WHERE id = ?`, [id]);
+      persist();
+      render();
+    }
+
+    function queryAll(filter) {
+      let sql = `SELECT * FROM items`;
+      const params = [];
+      if (filter) {
+        sql += ` WHERE (cas LIKE ? OR name LIKE ? OR notes LIKE ?)`;
+        const f = `%${filter}%`;
+        params.push(f, f, f);
+      }
+      sql += ` ORDER BY id DESC`;
+      const res = db.exec(sql, params);
+      if (!res.length) return [];
+      const cols = res[0].columns; const rows = res[0].values;
+      return rows.map(r => Object.fromEntries(r.map((v,i)=>[cols[i], v])));
+    }
+
+    function render() {
+      const filter = $("search").value?.trim() || '';
+      const rows = queryAll(filter);
+      const tbody = document.querySelector('#table tbody');
+      tbody.innerHTML = '';
+      rows.forEach((r) => {
+        const tr = document.createElement('tr');
+        tr.innerHTML = `
+          <td>${r.id}</td>
+          <td><span class="pill">${r.cas ?? ''}</span></td>
+          <td>${r.name ?? ''}</td>
+          <td class="right">${r.qty ?? ''}</td>
+          <td>${r.unit ?? ''}</td>
+          <td>${r.container ?? ''}</td>
+          <td style="white-space: pre-wrap; max-width: 420px;">${r.notes ?? ''}</td>
+          <td class="right"><button data-del="${r.id}">Delete</button></td>
+        `;
+        tbody.appendChild(tr);
+      });
+    }
+
+    function resetForm(keepFocus=false) {
+      const fields = ['cas','name','qty','unit','container','notes'];
+      fields.forEach(id => { const el = $(id); if (el.tagName === 'SELECT') el.selectedIndex = 0; else el.value = ''; });
+      if (keepFocus) $('cas').focus();
+    }
+
+    function exportDb() {
+      const data = db.export();
+      const blob = new Blob([data], {type: 'application/octet-stream'});
+      const url = URL.createObjectURL(blob);
+      download(url, `chem_inventory_${new Date().toISOString().slice(0,10)}.sqlite`);
+    }
+
+    function exportCsv() {
+      const rows = queryAll('');
+      const header = ['id','cas','name','qty','unit','container','notes','created_at'];
+      const esc = s => (s==null?'' : (""+s).replaceAll('"','""'));
+      const csv = [header.join(',')].concat(rows.map(r => header.map(k => `"${esc(r[k])}"`).join(','))).join('\n');
+      const blob = new Blob([csv], {type: 'text/csv'});
+      const url = URL.createObjectURL(blob);
+      download(url, `chem_inventory_${new Date().toISOString().slice(0,10)}.csv`);
+    }
+
+    function download(url, filename) {
+      const a = document.createElement('a'); a.href = url; a.download = filename; document.body.appendChild(a); a.click(); a.remove();
+      URL.revokeObjectURL(url);
+    }
+
+    function importDb(file) {
+      const reader = new FileReader();
+      reader.onload = () => {
+        const u8 = new Uint8Array(reader.result);
+        db = new SQL.Database(u8);
+        persist();
+        render();
+        status('Database imported', 'ok');
+      };
+      reader.readAsArrayBuffer(file);
+    }
+
+    async function fetchJSON(url, {timeoutMs=8000, signal}={}) {
+      const controller = new AbortController();
+      const to = setTimeout(()=>controller.abort(), timeoutMs);
+      try {
+        const r = await fetch(url, { signal: signal || controller.signal });
+        if (!r.ok) throw new Error(`HTTP ${r.status} for ${url}`);
+        return await r.json();
+      } finally { clearTimeout(to); }
+    }
+
+    // Safer PubChem lookups
+    async function pubchemByName(name) {
+      const q = name.trim(); if (!q) return null;
+      try {
+        const cids = await fetchJSON(`https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/name/${encodeURIComponent(q)}/cids/JSON`);
+        const cid = cids?.IdentifierList?.CID?.[0];
+        if (!cid) return null;
+        const prop = await fetchJSON(`https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/cid/${cid}/property/IUPACName/JSON`);
+        const iupac = prop?.PropertyTable?.Properties?.[0]?.IUPACName || q;
+        let rn = '';
+        try {
+          const rnJson = await fetchJSON(`https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/cid/${cid}/xrefs/RN/JSON`);
+          rn = pickCAS(rnJson?.InformationList?.Information?.[0]?.RN || []);
+        } catch (_) { /* no RN, leave blank */ }
+        return { name: iupac, cas: rn };
+      } catch (e) {
+        console.warn('pubchemByName failed:', e); return null;
+      }
+    }
+
+    async function pubchemByCas(cas) {
+      const rn = normCas(cas); if (!rn) return null;
+      try {
+        const cids = await fetchJSON(`https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/xref/RN/${encodeURIComponent(rn)}/cids/JSON`);
+        const cid = cids?.IdentifierList?.CID?.[0];
+        if (!cid) return null;
+        const prop = await fetchJSON(`https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/cid/${cid}/property/IUPACName/JSON`);
+        const iupac = prop?.PropertyTable?.Properties?.[0]?.IUPACName || '';
+        return { name: iupac, cas: rn };
+      } catch (e) {
+        console.warn('pubchemByCas failed:', e); return null;
+      }
+    }
+
+    async function onDemandLookup() {
+      const cas = $('cas').value; const name = $('name').value;
+      status('Querying PubChem…');
+      let res = null;
+      if (!cas && name) res = await pubchemByName(name);
+      else if (cas && !name) res = await pubchemByCas(cas);
+      else if (cas && name) { // both present: prefer to validate/normalize name
+        res = await pubchemByCas(cas) || await pubchemByName(name);
+      }
+      if (res) {
+        if (res.cas && !$('cas').value) $('cas').value = res.cas;
+        if (res.name && !$('name').value) $('name').value = res.name;
+        status('Filled from PubChem', 'ok');
+      } else {
+        status('No match', 'warn');
+      }
+    }
+
+    async function bulkLookupMissing() {
+      const btn = $('bulkBtn');
+      btn.disabled = true;
+      const res = db.exec(`SELECT id, cas, name FROM items WHERE (cas IS NULL OR TRIM(cas)='') OR (name IS NULL OR TRIM(name)='') ORDER BY id ASC`);
+      const rows = res.length ? res[0].values.map(v => ({id:v[0], cas:v[1]||'', name:v[2]||''})) : [];
+      if (!rows.length) { status('Nothing to fill'); btn.disabled=false; return; }
+      let done = 0; status('Bulk lookup started…');
+      for (const r of rows) {
+        btn.textContent = `Bulk Lookup: ${++done}/${rows.length}`;
+        try {
+          let info = null;
+          if (r.name && !r.cas) info = await pubchemByName(r.name);
+          else if (r.cas && !r.name) info = await pubchemByCas(r.cas);
+          if (info) {
+            const fields = {};
+            if (!r.cas && info.cas) fields.cas = info.cas;
+            if (!r.name && info.name) fields.name = info.name;
+            if (Object.keys(fields).length) updateItem(r.id, fields);
+          }
+        } catch (e) { console.warn('bulk item failed', r, e); }
+        await sleep(1100); // throttle to avoid rate limiting
+      }
+      btn.textContent = 'Bulk Lookup Missing';
+      btn.disabled = false;
+      render();
+      status('Bulk lookup complete', 'ok');
+    }
+
+    // Wire up events after DOM is ready
+    document.addEventListener('DOMContentLoaded', init);
+
+    document.addEventListener('DOMContentLoaded', () => {
+      $('addBtn').addEventListener('click', () => {
+        const rec = {
+          cas: normCas($('cas').value),
+          name: $('name').value.trim(),
+          qty: $('qty').value,
+          unit: $('unit').value,
+          container: $('container').value,
+          notes: $('notes').value.trim()
+        };
+        if (!rec.cas && !rec.name) { status('Provide CAS or name', 'bad'); return; }
+        if (rec.cas && !CAS_RE.test(rec.cas)) { status('CAS format looks wrong', 'warn'); }
+        addItem(rec);
+        resetForm(true);
+      });
+
+      $('lookupBtn').addEventListener('click', onDemandLookup);
+
+      $('autoLookup').addEventListener('change', e => {
+        status(e.target.checked ? 'Auto‑lookup enabled' : 'Auto‑lookup disabled');
+      });
+
+      ['cas','name'].forEach(id => {
+        $(id).addEventListener('blur', async () => {
+          if (!$('autoLookup').checked) return;
+          const cas = $('cas').value; const name = $('name').value;
+          if (!cas || !name) {
+            const res = cas ? await pubchemByCas(cas) : await pubchemByName(name);
+            if (res) {
+              if (res.cas && !cas) $('cas').value = res.cas;
+              if (res.name && !name) $('name').value = res.name;
+            }
+          }
+        });
+      });
+
+      $('search').addEventListener('input', render);
+
+      document.querySelector('#table').addEventListener('click', (e) => {
+        const btn = e.target.closest('button[data-del]');
+        if (!btn) return;
+        const id = Number(btn.getAttribute('data-del'));
+        if (confirm('Delete entry #' + id + '?')) deleteItem(id);
+      });
+
+      $('clearBtn').addEventListener('click', () => { $('search').value=''; render(); });
+
+      $('exportDbBtn').addEventListener('click', exportDb);
+      $('exportCsvBtn').addEventListener('click', exportCsv);
+      $('importDb').addEventListener('change', (e) => {
+        const f = e.target.files?.[0]; if (f) importDb(f);
+        e.target.value = '';
+      });
+
+      $('bulkBtn').addEventListener('click', bulkLookupMissing);
+
+      // Keyboard shortcuts: Enter to add, Ctrl+Enter keep focus, '/' for CAS, ',' for Name
+      document.addEventListener('keydown', (e) => {
+        if (e.key === 'Enter' && (document.activeElement.tagName !== 'TEXTAREA')) {
+          e.preventDefault();
+          const keep = e.ctrlKey || e.metaKey;
+          $('addBtn').click();
+          if (keep) $('cas').focus();
+        } else if (e.key === '/') { e.preventDefault(); $('cas').focus(); }
+        else if (e.key === ',') { e.preventDefault(); $('name').focus(); }
+      });
+    });
+  </script>
+</body>
+</html>
