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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>zebra audio</title>
+<style>
+  @font-face {
+    font-family: 'chunkfiveregular';
+    src: url('fonts/chunkfive-regular-webfont.woff2') format('woff2'),
+         url('fonts/chunkfive-regular-webfont.woff') format('woff');
+    font-weight: normal; font-style: normal;
+  }
+  * { box-sizing: border-box; margin: 0; padding: 0; }
+  body {
+    font-family: monospace; background: #fff; color: #000;
+    padding: 2rem; max-width: 560px; margin: 0 auto;
+  }
+  h1 {
+    font-family: 'chunkfiveregular', serif;
+    font-size: 3rem; font-weight: normal; letter-spacing: 0.02em;
+    line-height: 1; margin-bottom: 0.2rem;
+  }
+  .sub {
+    font-size: 0.75rem; color: #555; margin-bottom: 2rem;
+    letter-spacing: 0.05em; text-transform: uppercase;
+  }
+  .sub a { color: #555; }
+  h2 {
+    font-family: 'chunkfiveregular', serif; font-size: 1.1rem; font-weight: normal;
+    border-bottom: 1px solid #000; padding-bottom: 0.25rem; margin-bottom: 0.8rem;
+  }
+  section { margin-bottom: 1.6rem; }
+  button {
+    background: #fff; color: #000; border: 1px solid #000;
+    padding: 0.45rem 1.2rem; font-family: monospace; font-size: 0.9rem; cursor: pointer;
+  }
+  button:hover:not(:disabled) { background: #f0f0f0; }
+  button:disabled { opacity: 0.3; cursor: default; }
+  button.invert { background: #000; color: #fff; }
+  button.invert:hover:not(:disabled) { background: #333; }
+  .row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; }
+  input[type=text] {
+    font-family: monospace; font-size: 0.9rem; border: 1px solid #000;
+    padding: 0.45rem; background: #fff; color: #000; flex: 1; min-width: 0;
+  }
+  .dot { width: 10px; height: 10px; border-radius: 50%; border: 1px solid #000; background: #fff; flex-shrink: 0; }
+  .dot.ok { background: #060; border-color: #060; }
+  .dot.warn { background: #888; }
+  .status-line { font-size: 0.8rem; color: #555; }
+  .status-line.ok { color: #060; }
+  .status-line.err { color: #b00; }
+  .note { font-size: 0.75rem; color: #555; line-height: 1.5; }
+  .meter { height: 12px; border: 1px solid #000; background: #fff; position: relative; overflow: hidden; flex: 1; }
+  .meter-fill { height: 100%; background: #000; width: 0%; transition: width 0.06s linear; }
+  .log { border: 1px solid #000; height: 150px; overflow-y: auto; padding: 0.5rem; font-size: 0.75rem; line-height: 1.5; background: #fafafa; }
+  .log-line { margin-bottom: 0.2rem; word-wrap: break-word; }
+  .log-line .ts { color: #888; }
+  .log-line.err { color: #b00; }
+</style>
+</head>
+<body>
+
+<h1>zebra audio</h1>
+<p class="sub">encrypted voice &nbsp;·&nbsp; webrtc &nbsp;·&nbsp; rendezvous &nbsp;·&nbsp;
+  <a href="/">unturf</a></p>
+
+<section>
+  <h2>call</h2>
+  <div class="row">
+    <input type="text" id="rdv-code" placeholder="rendezvous code — both type the same thing">
+    <button id="btn-call" class="invert">call</button>
+  </div>
+  <div class="row">
+    <div class="dot warn" id="dot-call"></div>
+    <span id="call-status" class="status-line">idle</span>
+    <button id="btn-mute" style="margin-left:auto" disabled>mute</button>
+    <button id="btn-hangup" disabled>hang up</button>
+  </div>
+  <div class="row">
+    <div class="dot" id="dot-path"></div>
+    <span id="path-status" class="status-line">path: —</span>
+  </div>
+  <p class="note">
+    both partners type the same code and hit call. audio is end-to-end
+    encrypted (DTLS-SRTP), peer-to-peer when the network allows, relayed through
+    a TURN server otherwise. the rendezvous server only sees an opaque room id
+    and code-encrypted setup data.
+  </p>
+</section>
+
+<section>
+  <h2>levels</h2>
+  <div class="row">
+    <span class="note" style="min-width:3.5rem">you</span>
+    <div class="meter"><div class="meter-fill" id="meter-mic"></div></div>
+  </div>
+  <div class="row">
+    <span class="note" style="min-width:3.5rem">them</span>
+    <div class="meter"><div class="meter-fill" id="meter-rem"></div></div>
+  </div>
+</section>
+
+<section>
+  <h2>log</h2>
+  <div class="log" id="log"></div>
+</section>
+
+<audio id="remote-audio" autoplay></audio>
+
+<script>
+(async () => {
+const $ = (id) => document.getElementById(id);
+function b64(buf){ const u8=buf instanceof Uint8Array?buf:new Uint8Array(buf); let s=''; for(const b of u8) s+=String.fromCharCode(b); return btoa(s); }
+function unb64(s){ return Uint8Array.from(atob(s), c=>c.charCodeAt(0)); }
+function hex(buf){ const u8=buf instanceof Uint8Array?buf:new Uint8Array(buf); return Array.from(u8).map(b=>b.toString(16).padStart(2,'0')).join(''); }
+
+const logEl = $('log');
+function logLine(kind, msg){
+  const d=document.createElement('div'); d.className='log-line '+(kind||'');
+  d.innerHTML='<span class="ts">'+new Date().toLocaleTimeString()+'</span> '+msg;
+  logEl.appendChild(d); logEl.scrollTop=logEl.scrollHeight;
+}
+
+/* ---- rendezvous signaling (shared scheme with zebra-report) ---- */
+const SIGNAL_URL = new URLSearchParams(location.search).get('signal')
+  || 'wss://cors-proxy.uncloseai.com/zebra-signal';
+const SIGNAL_SALT = new TextEncoder().encode('zebra-signal-v1');
+const PBKDF2_ITER = 600000;
+async function deriveSignalRoom(code){
+  const h = await crypto.subtle.digest('SHA-256', new TextEncoder().encode('zebra-signal-room|'+code));
+  return hex(h);
+}
+async function deriveSignalKey(code){
+  const base = await crypto.subtle.importKey('raw', new TextEncoder().encode(code), 'PBKDF2', false, ['deriveKey']);
+  return crypto.subtle.deriveKey({ name:'PBKDF2', salt:SIGNAL_SALT, iterations:PBKDF2_ITER, hash:'SHA-256' },
+    base, { name:'AES-GCM', length:256 }, false, ['encrypt','decrypt']);
+}
+async function aesEncrypt(key, str){
+  const iv=crypto.getRandomValues(new Uint8Array(12));
+  const ct=new Uint8Array(await crypto.subtle.encrypt({name:'AES-GCM',iv}, key, new TextEncoder().encode(str)));
+  const out=new Uint8Array(12+ct.length); out.set(iv); out.set(ct,12); return out;
+}
+async function aesDecrypt(key, bytes){
+  const iv=bytes.slice(0,12), ct=bytes.slice(12);
+  return new TextDecoder().decode(await crypto.subtle.decrypt({name:'AES-GCM',iv}, key, ct));
+}
+
+/* ---- ephemeral TURN credentials ---- */
+const TURN_CRED_URL = new URLSearchParams(location.search).get('turncred')
+  || 'https://cors-proxy.uncloseai.com/turn-cred';
+let rtcConfig = { iceServers: [{ urls: ['stun:proxy.uncloseai.com:3478','stun:stun.l.google.com:19302'] }] };
+async function refreshTurnCred(){
+  try {
+    const c = await (await fetch(TURN_CRED_URL, {cache:'no-store'})).json();
+    if (c && c.credential && c.uris) {
+      rtcConfig = { iceServers: [
+        { urls: c.stun || ['stun:proxy.uncloseai.com:3478'] },
+        { urls: c.uris, username: c.username, credential: c.credential }
+      ] };
+      logLine('', 'TURN credentials fetched (relay fallback ready)');
+    }
+  } catch (e) { logLine('', 'no TURN creds — direct/STUN only ('+e.message+')'); }
+}
+
+/* ---- audio ---- */
+let micStream = null, audioCtx = null;
+async function getMic(){
+  if (micStream) return micStream;
+  micStream = await navigator.mediaDevices.getUserMedia({
+    audio: { echoCancellation:true, noiseSuppression:true, autoGainControl:true }, video:false
+  });
+  return micStream;
+}
+function meterFor(stream, fillId){
+  if (!audioCtx) audioCtx = new (window.AudioContext||window.webkitAudioContext)();
+  const src = audioCtx.createMediaStreamSource(stream);
+  const an = audioCtx.createAnalyser(); an.fftSize = 512;
+  src.connect(an);
+  const buf = new Uint8Array(an.fftSize);
+  const fill = $(fillId);
+  (function tick(){
+    if (!micStream && fillId==='meter-mic') return;
+    an.getByteTimeDomainData(buf);
+    let peak=0; for (let i=0;i<buf.length;i++){ const v=Math.abs(buf[i]-128)/128; if(v>peak)peak=v; }
+    fill.style.width = Math.min(100, Math.round(peak*180))+'%';
+    requestAnimationFrame(tick);
+  })();
+}
+
+/* ---- WebRTC ---- */
+let pc = null, relayWS = null, relayRole = null, relayKey = null;
+
+function waitForIceGathering(p, timeoutMs=6000){
+  return new Promise(res=>{
+    if (p.iceGatheringState==='complete') return res();
+    let done=false; const fin=()=>{ if(done)return; done=true; p.removeEventListener('icegatheringstatechange',h); clearTimeout(t); res(); };
+    const h=()=>{ if(p.iceGatheringState==='complete') fin(); };
+    p.addEventListener('icegatheringstatechange',h); const t=setTimeout(fin,timeoutMs);
+  });
+}
+function setStatus(msg, cls){ const e=$('call-status'); e.textContent=msg; e.className='status-line'+(cls?' '+cls:''); }
+function setPath(msg, cls){ const e=$('path-status'); e.textContent=msg; e.className='status-line'+(cls?' '+cls:''); const d=$('dot-path'); d.className='dot'+(cls==='ok'?' ok':cls==='err'?' warn':''); }
+
+async function ensurePC(){
+  if (pc) return pc;
+  pc = new RTCPeerConnection(rtcConfig);
+  for (const tr of micStream.getTracks()) pc.addTrack(tr, micStream);
+  pc.ontrack = (ev) => {
+    const stream = ev.streams[0] || new MediaStream([ev.track]);
+    $('remote-audio').srcObject = stream;
+    try { meterFor(stream, 'meter-rem'); } catch(_){}
+    logLine('', 'remote audio connected');
+  };
+  pc.onicecandidate = (ev) => { if (ev.candidate){ const t=(ev.candidate.candidate.match(/typ\s+(\S+)/)||[])[1]; logLine('','ice: '+(t||'?')); } };
+  pc.onconnectionstatechange = () => {
+    const s = pc.connectionState;
+    setStatus('call: '+s, s==='connected'?'ok':null);
+    $('dot-call').className = 'dot ' + (s==='connected'?'ok':'warn');
+    if (s==='connected'){ $('btn-mute').disabled=false; $('btn-hangup').disabled=false; setTimeout(reportPath,1200); }
+    else if (s==='failed'||s==='disconnected'||s==='closed'){ setPath('path: —', null); }
+  };
+  return pc;
+}
+async function reportPath(){
+  if (!pc) return;
+  try {
+    const stats = await pc.getStats(); let pair=null;
+    stats.forEach(r=>{ if(r.type==='candidate-pair'&&r.nominated&&r.state==='succeeded') pair=r; });
+    if (!pair) stats.forEach(r=>{ if(!pair&&r.type==='candidate-pair'&&r.state==='succeeded') pair=r; });
+    if (!pair){ setPath('path: connecting…', null); return; }
+    const loc=stats.get(pair.localCandidateId)||{}, rem=stats.get(pair.remoteCandidateId)||{};
+    if (loc.candidateType==='relay'||rem.candidateType==='relay')
+      setPath('path: RELAYED via TURN (a server forwards your encrypted audio)', 'err');
+    else
+      setPath('path: DIRECT peer-to-peer — nobody between you ('+(loc.candidateType||'?')+'/'+(rem.candidateType||'?')+')', 'ok');
+  } catch(_){}
+}
+
+function relaySend(obj){ if (relayWS && relayWS.readyState===1) relayWS.send(JSON.stringify(obj)); }
+async function relaySendSDP(kind, desc){ relaySend({ type:'sdp', kind, data: b64(await aesEncrypt(relayKey, JSON.stringify(desc))) }); }
+async function makeOffer(){
+  await ensurePC();
+  await pc.setLocalDescription(await pc.createOffer());
+  await waitForIceGathering(pc);
+  await relaySendSDP('offer', pc.localDescription);
+  setStatus('offer sent — connecting', null);
+}
+async function onSDP(kind, json){
+  const desc = JSON.parse(json);
+  if (kind==='offer'){
+    await ensurePC();
+    await pc.setRemoteDescription(desc);
+    await pc.setLocalDescription(await pc.createAnswer());
+    await waitForIceGathering(pc);
+    await relaySendSDP('answer', pc.localDescription);
+    setStatus('answer sent — connecting', null);
+  } else if (kind==='answer' && pc) {
+    await pc.setRemoteDescription(desc);
+  }
+}
+
+async function startCall(){
+  const code = $('rdv-code').value.trim();
+  if (!code){ setStatus('enter a rendezvous code first','err'); return; }
+  if (relayWS){ setStatus('already in a call — hang up first', null); return; }
+  try { await getMic(); meterFor(micStream,'meter-mic'); }
+  catch(e){ setStatus('microphone blocked: '+e.message,'err'); return; }
+  await refreshTurnCred();
+  relayKey = await deriveSignalKey(code);
+  const room = await deriveSignalRoom(code);
+  setStatus('connecting to rendezvous…', null);
+  $('btn-call').disabled = true;
+  relayWS = new WebSocket(SIGNAL_URL + '?room=' + encodeURIComponent(room));
+  relayWS.onopen = () => logLine('', 'rendezvous connected — waiting for partner');
+  relayWS.onclose = () => { if (relayWS) setStatus('rendezvous closed', null); relayWS=null; relayRole=null; $('btn-call').disabled=false; };
+  relayWS.onerror = () => setStatus('rendezvous error','err');
+  relayWS.onmessage = async (ev) => {
+    let m; try { m=JSON.parse(ev.data); } catch(_){ return; }
+    if (m.type==='welcome'){ relayRole=m.role; logLine('','role: '+m.role+' ('+m.peers+' present)'); if (relayRole==='offerer'&&m.peers>=2) await makeOffer(); }
+    else if (m.type==='peer-joined'){ logLine('','partner joined'); if (relayRole==='offerer') await makeOffer(); }
+    else if (m.type==='peer-left'){ logLine('','partner left'); setStatus('partner left', null); }
+    else if (m.type==='sdp'){ try { await onSDP(m.kind, await aesDecrypt(relayKey, unb64(m.data))); } catch(e){ logLine('err','sdp failed (codes must match): '+e.message); } }
+    else if (m.type==='error'){ setStatus('rendezvous: '+m.message,'err'); }
+  };
+}
+function hangup(){
+  if (relayWS){ const w=relayWS; relayWS=null; try{w.close();}catch(_){} }
+  if (pc){ try{pc.close();}catch(_){} pc=null; }
+  $('remote-audio').srcObject = null;
+  $('btn-mute').disabled=true; $('btn-hangup').disabled=true; $('btn-call').disabled=false;
+  $('dot-call').className='dot warn'; setStatus('idle', null); setPath('path: —', null);
+  $('meter-rem').style.width='0%';
+  logLine('', 'call ended');
+}
+let muted=false;
+function toggleMute(){
+  if (!micStream) return;
+  muted=!muted;
+  micStream.getAudioTracks().forEach(t=>t.enabled=!muted);
+  $('btn-mute').textContent = muted?'unmute':'mute';
+  $('btn-mute').className = muted?'invert':'';
+}
+
+$('btn-call').addEventListener('click', startCall);
+$('btn-hangup').addEventListener('click', hangup);
+$('btn-mute').addEventListener('click', toggleMute);
+$('rdv-code').addEventListener('keydown', e=>{ if(e.key==='Enter'){ e.preventDefault(); startCall(); } });
+logLine('', 'ready — type a rendezvous code and call. mic stays muted to the room until connected.');
+})();
+</script>
+</body>
+</html>
