every-other-token 4.3.2

Watch an LLM answer token by token: a CLI and web UI that intercepts the OpenAI or Anthropic stream, shows per-token confidence and perplexity from logprobs, and rewrites every other token live. Mock provider needs no API key.
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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>Every Other Token</title>
<style>
*{margin:0;padding:0;box-sizing:border-box}
:root{--bg:#0c0d0b;--fg:#e6e1d3;--card-bg:#141512;--border:#25271f}
body{background:var(--bg);color:var(--fg);font-family:'Cascadia Code','Fira Code',monospace;min-height:100vh;display:flex;flex-direction:column}
body[data-theme=light]{--bg:#ffffff;--fg:#24292f;--card-bg:#f6f8fa;--border:#d0d7de}
header{padding:16px 24px;border-bottom:1px solid #25271f;display:flex;align-items:center;justify-content:space-between}
header h1{font-size:1.2rem;color:#e8c872}
.hdr-right{display:flex;gap:8px}
.controls{display:flex;gap:10px;padding:12px 24px;flex-wrap:wrap;align-items:end;border-bottom:1px solid #25271f;background:#141512}
.field{display:flex;flex-direction:column;gap:3px}
.field label{font-size:.7rem;color:#96917f;text-transform:uppercase;letter-spacing:.5px}
.field input,.field select{background:#0c0d0b;border:1px solid #36382f;color:#e6e1d3;padding:6px 10px;border-radius:6px;font-family:inherit;font-size:.85rem}
.field input:focus,.field select:focus{outline:none;border-color:#e8c872}
.field input[type=text]{min-width:240px}
.btn{border:none;padding:6px 14px;border-radius:6px;font-family:inherit;font-size:.85rem;cursor:pointer;color:#fff}
.btn-go{background:#238636}.btn-go:hover{background:#2ea043}
.btn-go:disabled{background:#25271f;color:#5f5b50;cursor:not-allowed}
.btn-mode{background:#36382f}.btn-mode:hover{background:#5f5b50}
.btn-mode.active{background:#4d4b3e}
.btn-export{background:#6e40c9}.btn-export:hover{background:#8957e5}
.toggle{display:flex;align-items:center;gap:5px;font-size:.8rem;color:#96917f;cursor:pointer;user-select:none}
.toggle input{accent-color:#e8c872}
/* View modes */
#views{flex:1;overflow:auto;position:relative}
/* Single column */
.view-single{padding:20px 24px;line-height:1.8;font-size:1rem;white-space:pre-wrap;word-wrap:break-word}
/* Side-by-side */
.view-sidebyside{display:grid;grid-template-columns:1fr 1fr;height:100%}
.sbs-col{padding:16px 20px;line-height:1.8;font-size:.95rem;white-space:pre-wrap;word-wrap:break-word;overflow-y:auto}
.sbs-col:first-child{border-right:1px solid #25271f}
.sbs-label{font-size:.7rem;color:#96917f;text-transform:uppercase;letter-spacing:1px;margin-bottom:8px;display:block}
/* Multi-transform 2x2 grid */
.view-multi{display:grid;grid-template-columns:1fr 1fr;grid-template-rows:1fr 1fr;height:100%}
.multi-panel{padding:12px 16px;line-height:1.6;font-size:.85rem;white-space:pre-wrap;word-wrap:break-word;overflow-y:auto;border:1px solid #25271f}
.multi-label{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:1px;margin-bottom:6px;display:block}
.mp-reverse .multi-label{color:#e8c872}
.mp-uppercase .multi-label{color:#f0883e}
.mp-mock .multi-label{color:#a371f7}
.mp-noise .multi-label{color:#3fb950}
.mp-reverse .token.odd{color:#e8c872;font-weight:bold}
.mp-uppercase .token.odd{color:#f0883e;font-weight:bold}
.mp-mock .token.odd{color:#a371f7;font-weight:bold}
.mp-noise .token.odd{color:#3fb950;font-weight:bold}
/* Tokens */
.token{display:inline;animation:fadeIn .12s ease-in}
.token.odd{color:#ff6a2b;font-weight:bold}
.token.even{color:#e6e1d3}
.heat-4{background:#f85149;color:#fff}.heat-3{background:#f0883e;color:#000}
.heat-2{background:#e3b341;color:#000}.heat-1{background:#e8c872;color:#fff}.heat-0{}
@keyframes fadeIn{from{opacity:0;transform:translateY(2px)}to{opacity:1;transform:translateY(0)}}
/* Graph */
#graph-wrap{border-top:1px solid #25271f;background:#090a08;display:none;overflow-x:auto}
#graph-wrap.show{display:block}
#graph-toggle-bar{padding:6px 24px;border-top:1px solid #25271f;background:#141512;display:flex;align-items:center;gap:12px}
canvas#depgraph{width:100%;height:200px;display:block}
/* Stats */
#stats{padding:8px 24px;border-top:1px solid #25271f;font-size:.78rem;color:#96917f;background:#141512;display:flex;gap:20px;flex-wrap:wrap}
/* Chaos tooltip */
.token[title]{position:relative;cursor:help;border-bottom:1px dotted #e8c872}
.token[title]:hover::after{content:attr(title);position:absolute;top:-1.8em;left:0;background:#1c2333;color:#e8c872;padding:2px 6px;border-radius:4px;font-size:.7rem;white-space:nowrap;z-index:10;pointer-events:none}
/* Diff view */
.view-diff{display:grid;grid-template-columns:1fr 1fr;height:100%}
.diff-col{padding:16px 20px;line-height:1.8;font-size:.95rem;white-space:pre-wrap;word-wrap:break-word;overflow-y:auto}
.diff-col:first-child{border-right:1px solid #25271f}
.diff-label{font-size:.7rem;color:#96917f;text-transform:uppercase;letter-spacing:1px;margin-bottom:8px;display:block}
.diff-match{background:#0d2010;color:#3fb950}
.diff-diverge{background:#200d0d;color:#f85149}
/* Token surgery */
.token.surgeable{cursor:pointer}
.token.surgeable:hover{text-decoration:underline dotted #e3b341;background:rgba(227,179,65,.08)}
.token-input{font-family:inherit;font-size:inherit;background:#1f2937;color:#e3b341;border:1px solid #e3b341;border-radius:3px;padding:0 2px;min-width:20px;outline:none}
/* Confidence bars */
.conf-bar{display:inline-block;width:100%;height:2px;border-radius:1px;margin-top:1px;vertical-align:bottom}
.token-wrap{display:inline-flex;flex-direction:column;align-items:center;vertical-align:top}
.conf-high{background:#3fb950}.conf-mid{background:#e3b341}.conf-low{background:#f85149}.conf-none{background:#36382f}
/* High-perplexity pulse */
@keyframes perpPulse{0%,100%{opacity:1}50%{opacity:.4}}
.high-perp{animation:perpPulse 1.2s ease-in-out 3}
/* Perplexity sparkline */
#perp-spark-wrap{padding:4px 24px;background:#141512;border-top:1px solid #25271f;display:none}
#perp-spark-wrap.show{display:block}
#perp-spark{width:100%;height:40px;display:block}
/* A/B Experiment view */
.view-experiment{display:grid;grid-template-columns:1fr 1fr;grid-template-rows:3fr 1fr;height:100%;gap:0;min-height:0}
.exp-panel{padding:12px 16px;line-height:1.8;font-size:.9rem;white-space:pre-wrap;word-wrap:break-word;overflow-y:auto;border:1px solid #25271f}
.exp-label{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:1px;margin-bottom:6px;display:block;color:#e8c872}
.exp-label.b{color:#a371f7}
.exp-perp-chart{padding:8px 16px;background:#090a08;border:1px solid #25271f;overflow:hidden}
.exp-diverge-map{padding:8px 16px;background:#090a08;border:1px solid #25271f;overflow-y:auto;font-size:.8rem}
.ab-system-prompts{display:none;gap:10px;padding:6px 24px;background:#141512;border-bottom:1px solid #25271f;flex-wrap:wrap}
.ab-system-prompts.show{display:flex}
/* Research dashboard */
#research-dash{display:none;padding:12px 24px;background:#0c0d0b;border-top:2px solid #25271f;font-size:.78rem}
#research-dash.show{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}
.dash-card{background:#141512;border:1px solid #25271f;border-radius:6px;padding:10px 12px}
.dash-card h3{font-size:.7rem;color:#96917f;text-transform:uppercase;letter-spacing:.5px;margin-bottom:6px}
.dash-card .val{font-size:1.1rem;color:#e6e1d3;font-weight:bold}
.dash-card .sub{font-size:.7rem;color:#5f5b50;margin-top:2px}
#conf-hist{display:flex;align-items:flex-end;gap:1px;height:32px;margin-top:4px}
.hist-bar{flex:1;background:#4d4b3e;min-height:2px;border-radius:1px 1px 0 0}
#citation{font-size:.68rem;color:#5f5b50;word-break:break-all;margin-top:4px;line-height:1.4}
/* ---- Multiplayer ---- */
#mp-panel{display:none;background:#0a1a14;border-bottom:1px solid #1a3a28;padding:8px 24px;gap:16px;flex-wrap:wrap;align-items:center}
#mp-panel.show{display:flex}
.mp-code{font-size:1.3rem;font-weight:bold;color:#3fb950;letter-spacing:4px;background:#0c0d0b;padding:4px 12px;border-radius:4px;border:1px solid #1a3a28;cursor:pointer;user-select:all}
.mp-label{font-size:.65rem;color:#96917f;text-transform:uppercase;letter-spacing:.5px;margin-bottom:2px}
#mp-count-badge{display:inline-flex;align-items:center;justify-content:center;background:#25271f;border-radius:10px;padding:1px 8px;font-size:.75rem;color:#e3b341;min-width:24px}
/* Sidebar */
#sidebar{position:fixed;right:0;top:0;width:200px;height:100vh;background:#0c0d0b;border-left:1px solid #25271f;display:none;flex-direction:column;z-index:200}
#sidebar.show{display:flex}
#sidebar-hdr{padding:10px 12px;border-bottom:1px solid #25271f;display:flex;justify-content:space-between;align-items:center;font-size:.7rem;color:#96917f;text-transform:uppercase;letter-spacing:.5px}
#participant-list{flex:1;overflow-y:auto;padding:8px}
.p-item{display:flex;align-items:center;gap:7px;padding:5px 4px;border-radius:4px;font-size:.76rem;margin-bottom:2px}
.p-avatar{width:22px;height:22px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.6rem;font-weight:bold;color:#0c0d0b;flex-shrink:0}
.p-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.p-host{font-size:.55rem;background:#4d4b3e;color:#fff;padding:1px 4px;border-radius:3px}
/* Chat */
#chat-panel{position:fixed;right:200px;top:0;width:240px;height:100vh;background:#090a08;border-left:1px solid #25271f;display:none;flex-direction:column;z-index:199}
#chat-panel.show{display:flex}
#chat-hdr{padding:8px 12px;border-bottom:1px solid #25271f;font-size:.7rem;color:#96917f;text-transform:uppercase;letter-spacing:.5px}
#chat-msgs{flex:1;overflow-y:auto;padding:8px;display:flex;flex-direction:column;gap:5px}
.chat-msg{font-size:.72rem;line-height:1.45}
.chat-author{font-weight:bold}
.chat-text{color:#e6e1d3;word-break:break-word}
.chat-ref{font-size:.64rem;color:#5f5b50;margin-top:1px}
#chat-wrap{padding:8px;border-top:1px solid #25271f;display:flex;gap:4px}
#chat-in{flex:1;background:#141512;border:1px solid #36382f;color:#e6e1d3;border-radius:4px;padding:4px 7px;font-family:inherit;font-size:.73rem;outline:none}
#chat-in:focus{border-color:#e8c872}
#chat-btn{background:#4d4b3e;border:none;color:#fff;border-radius:4px;padding:4px 8px;cursor:pointer;font-family:inherit;font-size:.73rem}
/* Vote bar */
#vote-bar{display:none;gap:10px;padding:4px 24px;background:#0c0d0b;border-top:1px solid #25271f;align-items:center;font-size:.75rem}
#vote-bar.show{display:flex}
.v-btn{border:1px solid #36382f;background:#141512;color:#e6e1d3;border-radius:4px;padding:2px 10px;cursor:pointer;font-family:inherit;font-size:.75rem}
.v-btn:hover{background:#25271f}
/* Replay */
#replay-prog{height:3px;background:#25271f;border-radius:2px;overflow:hidden;display:none;flex:1}
#replay-prog.show{display:block}
#replay-bar{height:100%;background:#a371f7;width:0%;transition:width .08s linear}
/* Transform preview */
#transform-preview{padding:4px 24px;background:#090a08;border-top:1px solid #25271f;font-size:.72rem;color:#96917f;display:none}
#transform-preview.show{display:block}
/* Chain builder */
#chain-builder{display:none;padding:6px 12px;background:#0c0d0b;border:1px solid #36382f;border-radius:6px;margin-top:4px}
#chain-builder.show{display:block}
#chain-builder label{display:flex;align-items:center;gap:5px;font-size:.75rem;color:#e6e1d3;margin-bottom:3px;cursor:pointer}
#chain-current{font-size:.68rem;color:#e3b341;margin-top:4px}
/* A/B bar chart */
#ab-chart-wrap{padding:8px 16px;background:#090a08;border:1px solid #25271f;margin-top:8px}
#ab-chart-title{font-size:.7rem;color:#96917f;margin-bottom:4px}
#ab-chart{display:block;width:100%}
/* Research runs */
#research-runs-row{display:flex;align-items:center;gap:8px;margin-bottom:8px;font-size:.78rem;color:#96917f}
/* Rec button */
.btn-rec-on{background:#f85149}
@keyframes recPulse{0%,100%{opacity:1}50%{opacity:.5}}
.btn-rec-on{animation:recPulse 1.1s ease-in-out infinite}
/* Surgery peer flash */
@keyframes peerEdit{0%{box-shadow:0 0 0 2px currentColor}100%{box-shadow:none}}
.peer-edited{animation:peerEdit .8s ease-out forwards}
/* Join toast */
@keyframes slideIn{from{opacity:0;transform:translateX(10px)}to{opacity:1;transform:none}}
/* Shortcuts modal */
#shortcuts-modal{display:none;position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:10000;align-items:center;justify-content:center}
#shortcuts-modal.show{display:flex}
#shortcuts-box{background:#141512;border:1px solid #36382f;border-radius:8px;padding:20px 28px;min-width:320px;max-width:480px}
#shortcuts-box h2{font-size:.9rem;color:#e8c872;margin-bottom:12px}
#shortcuts-box table{width:100%;border-collapse:collapse;font-size:.8rem}
#shortcuts-box td{padding:4px 8px;color:#e6e1d3}
#shortcuts-box td:first-child{color:#e3b341;font-weight:bold;white-space:nowrap;width:120px}
#shortcuts-box tr:hover{background:#1f2937}
#shortcuts-close{float:right;background:none;border:none;color:#96917f;cursor:pointer;font-size:1.1rem;margin-top:-4px}
/* Toast notifications */
#toast-container{position:fixed;bottom:20px;right:20px;z-index:9999;display:flex;flex-direction:column;gap:8px;pointer-events:none}
.toast{padding:10px 16px;border-radius:6px;font-size:.8rem;color:#fff;animation:slideIn .2s ease-out;pointer-events:auto;max-width:320px;word-break:break-word}
.toast-warning{background:#9e6a03;border:1px solid #e3b341}
.toast-error{background:#6d1d1d;border:1px solid #f85149}
.toast-info{background:#1f3a5f;border:1px solid #e8c872}
.join-toast{animation:slideIn .2s ease-out;font-size:.7rem;color:#96917f;padding:4px 6px;margin-bottom:4px;border-radius:3px;border:1px solid #25271f;background:#0c0d0b}
@media(max-width:640px){#sidebar{width:100%;position:relative;height:auto;border-left:none;border-top:1px solid #25271f}#chat-panel{right:0;width:100%;border-left:none;border-top:1px solid #25271f}body.sidebar-open{padding-right:0!important}}
/* Deleted token placeholder */
.token-deleted{color:#5f5b50;text-decoration:line-through;font-style:italic}
/* Host badge */
.host-badge{background:#4d4b3e;color:#fff;font-size:.65rem;padding:1px 5px;border-radius:3px;margin-left:4px;font-weight:700;letter-spacing:.05em}
/* Colorblind-safe heatmap */
body.cb-mode .heat-0{background:#000!important;color:#fff!important}
body.cb-mode .heat-1{background:#555!important}
body.cb-mode .heat-2{background:#999!important}
body.cb-mode .heat-3{background:#ccc!important;color:#000!important}
body.cb-mode .heat-4{background:#fff!important;color:#000!important;border:1px solid #ccc}
body.cb-mode .heat-0::after{content:'●';font-size:.5em}
body.cb-mode .heat-1::after{content:'◕';font-size:.5em}
body.cb-mode .heat-2::after{content:'◑';font-size:.5em}
body.cb-mode .heat-3::after{content:'◔';font-size:.5em}
body.cb-mode .heat-4::after{content:'○';font-size:.5em}
/* Mobile responsive */
@media(max-width:768px){
  #sidebar{display:none!important}
  #chat-panel{display:none!important}
  body{padding-right:0!important}
  .hdr-right{flex-wrap:wrap;gap:4px}
  #btn-experiment,#btn-research,#btn-multi,#btn-diff{font-size:.7rem;padding:4px 8px}
}
@media(max-width:640px){
  .controls{flex-direction:column;align-items:stretch;padding:8px 12px}
  .field input[type=text]{min-width:unset;width:100%}
  .field select{width:100%}
  .view-single{font-size:1.05rem}
  .view-sidebyside,.view-diff{grid-template-columns:1fr;grid-template-rows:1fr 1fr}
  .view-multi{grid-template-columns:1fr;grid-template-rows:repeat(4,1fr)}
}
/* ---- Theme: the token stream. Warm ink, one signal color for intercepted tokens. ---- */
:root{--xf:#ff6a2b;--gold:#e8c872}
body{font-family:ui-monospace,'Cascadia Code','JetBrains Mono','SF Mono',Menlo,Consolas,monospace}
header{gap:16px;flex-wrap:wrap;padding:14px 24px}
header h1{font-size:1.05rem;color:#e6e1d3;white-space:nowrap;letter-spacing:-.01em;font-weight:600}
header h1 .h1-x{color:var(--xf)}
.hdr-right{flex-wrap:wrap;justify-content:flex-end;gap:6px}
.hdr-right .btn{padding:5px 10px;font-size:.78rem}
#join-code{width:104px!important}
.btn{border-radius:5px;transition:background .12s,border-color .12s,color .12s}
.btn-mode,.btn-export{background:transparent;border:1px solid #36382f;color:#c9c4b6}
.btn-mode:hover,.btn-export:hover{background:#1c1d19;border-color:#5f5b50;color:#e6e1d3}
.btn-mode.active{background:#e6e1d3;border-color:#e6e1d3;color:#0c0d0b}
.btn-go{background:var(--xf);color:#170904;font-weight:700}
.btn-go:hover{background:#ff8450}
.btn-go:disabled{background:#25271f;color:#5f5b50}
.field input:focus,.field select:focus{border-color:var(--gold)}
.token.odd{color:var(--xf);font-weight:600}
.view-single{font-size:1.05rem;line-height:2;max-width:78ch;padding:28px 32px}
.conf-high{background:#7fd69f}.conf-mid{background:#e8c872}.conf-low{background:#ff6a6a}
/* On tokens, confidence is an underline, not a fill: green sure, gold unsure, red guessing. */
.token.conf-high:not([class*=heat-]),.token.conf-mid:not([class*=heat-]),.token.conf-low:not([class*=heat-]){background:none;text-decoration-line:underline;text-decoration-thickness:2px;text-underline-offset:7px}
.token.conf-high{text-decoration-color:#7fd69f}.token.conf-mid{text-decoration-color:#e8c872}.token.conf-low{text-decoration-color:#ff5c7a}
.token[data-ws]::before{content:attr(data-ws);display:inline-block;white-space:pre}
.token[title]{border-bottom:none}
@media(max-width:640px){.hdr-right{justify-content:flex-start;gap:6px}.hdr-right .btn{font-size:.72rem!important;padding:5px 9px!important}}
</style>
</head>
<body>
<header>
  <h1>every-<span class="h1-x">other</span>-token</h1>
  <div class="hdr-right">
    <button class="btn btn-mode active" id="btn-single" title="Single stream" aria-label="Single stream view">Single</button>
    <button class="btn btn-mode" id="btn-sbs" title="Side-by-side: original vs transformed" aria-label="Side-by-side view: original vs transformed">Split</button>
    <button class="btn btn-mode" id="btn-multi" title="All 4 transforms simultaneously" aria-label="Quad view: all 4 transforms simultaneously">Quad</button>
    <button class="btn btn-mode" id="btn-diff" title="Live diff: OpenAI vs Anthropic simultaneously" aria-label="Diff view: OpenAI vs Anthropic">Diff</button>
    <button class="btn btn-mode" id="btn-experiment" title="A/B experiment: two system prompts, same user prompt" aria-label="A/B experiment mode">Experiment</button>
    <button class="btn btn-mode" id="btn-research" title="Research dashboard: stats, perplexity, confidence" aria-label="Research dashboard">Research</button>
    <button class="btn btn-export" id="btn-export" title="Export session as JSON" aria-label="Export session as JSON">Export JSON</button>
    <button class="btn btn-export" id="btn-export-csv" title="Export session as CSV" aria-label="Export session as CSV">Export CSV</button>
    <button class="btn btn-export" id="btn-import" title="Import a previously exported JSON session" aria-label="Import JSON session">Import JSON</button>
    <input type="file" id="import-file" accept=".json" style="display:none" aria-label="Select JSON file to import">
    <button class="btn btn-mode" id="btn-cb-mode" aria-label="Toggle colorblind-safe mode" title="Colorblind safe" style="font-size:.78rem;padding:4px 10px">◑ CB</button>
    <button class="btn btn-mode" id="btn-theme" title="Toggle dark/light theme" style="font-size:1rem;padding:4px 10px" aria-label="Toggle dark/light theme"><span aria-hidden="true">🌙</span></button>
    <button class="btn btn-mode" style="font-size:.78rem;padding:5px 12px" id="btn-host" title="Host a collaborative session" aria-label="Host a collaborative session">Host Session</button>
    <input type="text" id="join-code" placeholder="Room code" maxlength="6" pattern="[A-Z0-9]+" inputmode="text" autocomplete="off" oninput="this.value=this.value.toUpperCase().replace(/[^A-Z0-9]/g,'')" style="background:#0c0d0b;border:1px solid #36382f;color:#3fb950;border-radius:6px;padding:5px 8px;font-family:inherit;font-size:.78rem;width:88px;text-transform:uppercase;letter-spacing:2px" aria-label="Room code">
    <button class="btn btn-mode" style="font-size:.78rem;padding:5px 12px" id="btn-join">Join</button>
  </div>
</header>
<div id="ab-prompts" class="ab-system-prompts">
  <div class="field"><label>System Prompt A</label><input type="text" id="sysprompt-a" value="You are a creative storyteller." style="min-width:280px"></div>
  <div class="field"><label>System Prompt B</label><input type="text" id="sysprompt-b" value="You are a technical writer. Be precise and concise." style="min-width:280px"></div>
</div>
<div class="controls">
  <div class="field"><label for="prompt">Prompt</label><input type="text" id="prompt" value="Tell me a story about a robot" placeholder="Enter prompt..."></div>
  <div class="field"><label for="transform">Transform</label>
    <div style="display:flex;gap:4px;align-items:center">
      <select id="transform"><option value="reverse">reverse</option><option value="uppercase">uppercase</option><option value="mock">mock</option><option value="noise">noise</option><option value="chaos">chaos</option></select>
      <button id="btn-chain-mode" class="btn btn-mode" style="padding:4px 8px;font-size:.73rem" title="Toggle chain builder">Chain</button>
    </div>
    <div id="chain-builder">
      <label><input type="checkbox" data-tx="reverse"> reverse</label>
      <label><input type="checkbox" data-tx="uppercase"> uppercase</label>
      <label><input type="checkbox" data-tx="mock"> mock</label>
      <label><input type="checkbox" data-tx="noise"> noise</label>
      <label><input type="checkbox" data-tx="scramble"> scramble</label>
      <label><input type="checkbox" data-tx="delete"> delete</label>
      <label><input type="checkbox" data-tx="synonym"> synonym</label>
      <div id="chain-current" style="color:#5f5b50">none</div>
    </div>
  </div>
  <div class="field"><label for="provider">Provider</label><select id="provider"><option value="openai">OpenAI</option><option value="anthropic">Anthropic</option><option value="mock">Mock (no API key)</option></select></div>
  <div class="field"><label for="model">Model</label><input type="text" id="model" value="" placeholder="auto" style="min-width:160px"></div>
  <label class="toggle"><input type="checkbox" id="heatmap"> Heatmap</label>
  <label class="toggle"><input type="checkbox" id="graphtoggle"> Graph</label>
  <div class="field"><label for="min-confidence">Min Conf</label>
    <div style="display:flex;align-items:center;gap:4px">
      <input type="range" id="min-confidence" min="0" max="100" value="0" style="width:80px;accent-color:#e8c872">
      <span id="conf-label" style="font-size:.78rem;color:#e6e1d3;min-width:28px">0%</span>
    </div>
  </div>
  <button class="btn btn-go" id="start">Stream</button>
  <div class="field"><label>Search tokens</label><input type="text" id="token-search" placeholder="Filter…" style="min-width:120px" aria-label="Search token stream"></div>
</div>
<div id="transform-preview"></div>
<div id="views">
  <!-- Single column (default) -->
  <div class="view-single" id="v-single"></div>
  <!-- Side-by-side -->
  <div class="view-sidebyside" id="v-sbs" style="display:none">
    <div class="sbs-col" id="sbs-orig"><span class="sbs-label">Original</span></div>
    <div class="sbs-col" id="sbs-xform"><span class="sbs-label">Transformed</span></div>
  </div>
  <!-- Multi-transform 2x2 -->
  <div class="view-multi" id="v-multi" style="display:none">
    <div class="multi-panel mp-reverse" id="mp-reverse"><span class="multi-label">Reverse</span></div>
    <div class="multi-panel mp-uppercase" id="mp-uppercase"><span class="multi-label">Uppercase</span></div>
    <div class="multi-panel mp-mock" id="mp-mock"><span class="multi-label">Mock</span></div>
    <div class="multi-panel mp-noise" id="mp-noise"><span class="multi-label">Noise</span></div>
  </div>
  <!-- Diff: OpenAI vs Anthropic side by side -->
  <div class="view-diff" id="v-diff" style="display:none">
    <div class="diff-col" id="diff-openai"><span class="diff-label">OpenAI</span></div>
    <div class="diff-col" id="diff-anthropic"><span class="diff-label">Anthropic</span></div>
  </div>
  <!-- A/B Experiment: 4 panels -->
  <div class="view-experiment" id="v-experiment" style="display:none">
    <div class="exp-panel" id="exp-a"><span class="exp-label">System Prompt A</span></div>
    <div class="exp-panel" id="exp-b"><span class="exp-label b">System Prompt B</span></div>
    <div class="exp-perp-chart" id="exp-perp"><span style="font-size:.7rem;color:#96917f">Perplexity comparison (A=gold, B=purple): run streams to populate</span><br><canvas id="exp-perp-canvas" style="width:100%;height:120px;display:block;margin-top:4px"></canvas></div>
    <div class="exp-diverge-map" id="exp-diverge"><span style="font-size:.7rem;color:#96917f">Divergence map: run streams to populate</span></div>
  </div>
  <!-- A/B Agreement Chart: shown below experiment grid -->
  <div id="ab-chart-wrap" style="display:none;padding:8px 16px;background:#090a08;border-top:1px solid #25271f">
    <div id="ab-chart-title" style="font-size:.7rem;color:#96917f;margin-bottom:4px">Token Agreement: first 50 positions (green=match, red=diverge)</div>
    <canvas id="ab-chart" height="80" style="display:block;width:100%"></canvas>
  </div>
  <!-- Research dashboard -->
  <div id="v-research" style="display:none;padding:16px 24px;overflow-y:auto;height:100%">
    <h2 style="color:#e8c872;font-size:1rem;margin-bottom:4px">Research Dashboard</h2>
    <div id="research-runs-row">
      <span>Research runs:</span>
      <input type="number" id="research-runs" value="3" min="1" max="20" style="width:45px;background:#0c0d0b;border:1px solid #36382f;color:#e6e1d3;padding:3px 6px;border-radius:4px;font-family:inherit;font-size:.78rem">
      <span id="research-progress" style="color:#a371f7"></span>
    </div>
    <button id="btn-export-research" class="btn btn-export" style="font-size:.73rem;padding:4px 12px;margin-bottom:8px" aria-label="Export research stats as Markdown">Export Stats (MD)</button>
    <p style="font-size:.75rem;color:#96917f;margin-bottom:12px">Stats computed from the most recent stream. Stream tokens first.</p>
    <div id="research-grid" style="display:grid;grid-template-columns:repeat(3,1fr);gap:12px"></div>
    <div style="margin-top:16px">
      <div style="font-size:.72rem;color:#96917f;text-transform:uppercase;letter-spacing:.5px;margin-bottom:4px">Top 10 High-Perplexity Tokens</div>
      <ol id="research-perp-list" style="list-style:none;font-size:.8rem;color:#e6e1d3"></ol>
    </div>
    <div style="margin-top:16px">
      <div style="font-size:.72rem;color:#96917f;text-transform:uppercase;letter-spacing:.5px;margin-bottom:4px">Perplexity Distribution</div>
      <label style="display:flex;align-items:center;gap:6px;font-size:.7rem;color:#96917f;margin-bottom:4px">
        Perplexity bins: <input type="range" id="perp-bin-slider" min="5" max="50" value="10" style="width:80px;accent-color:#a371f7">
        <span id="perp-bin-count">10</span>
      </label>
      <div id="research-perp-hist" style="display:flex;gap:2px;align-items:flex-end;height:48px;margin-top:4px"></div>
    </div>
    <div style="margin-top:16px">
      <div style="font-size:.72rem;color:#96917f;text-transform:uppercase;letter-spacing:.5px;margin-bottom:4px">Confidence Distribution</div>
      <div id="research-conf-hist" style="display:flex;gap:2px;align-items:flex-end;height:48px;margin-top:4px"></div>
      <div style="display:flex;justify-content:space-between;font-size:.6rem;color:#5f5b50;margin-top:2px"><span>0.0</span><span>0.5</span><span>1.0</span></div>
    </div>
    <div style="margin-top:16px" id="sig-test-section">
      <div style="font-size:.72rem;color:#96917f;text-transform:uppercase;letter-spacing:.5px;margin-bottom:4px">A/B Significance Test (Even vs Odd Runs)</div>
      <div id="sig-test-result" style="background:#141512;border:1px solid #25271f;border-radius:4px;padding:10px 12px;font-size:.8rem">
        <span style="color:#5f5b50">Run at least 4 tokens from two alternating runs to see results.</span>
      </div>
    </div>
    <div style="margin-top:16px">
      <div style="font-size:.72rem;color:#96917f;text-transform:uppercase;letter-spacing:.5px;margin-bottom:4px">Citation</div>
      <code id="research-citation" style="font-size:.7rem;color:#e3b341;white-space:pre-wrap;display:block;background:#141512;padding:8px;border-radius:4px;border:1px solid #25271f"></code>
    </div>
    <div style="margin-top:16px" id="undo-history-section">
      <div style="font-size:.72rem;color:#96917f;text-transform:uppercase;letter-spacing:.5px;margin-bottom:4px">Surgery Edit History</div>
      <div id="surgery-history" style="background:#141512;border:1px solid #25271f;border-radius:4px;padding:8px 12px;font-size:.78rem;max-height:120px;overflow-y:auto;color:#e6e1d3">
        <span style="color:#5f5b50">No edits yet.</span>
      </div>
      <div style="display:flex;gap:6px;margin-top:6px">
        <button id="btn-undo-one" class="btn" style="background:#25271f;font-size:.73rem;padding:3px 10px" title="Undo last edit (Ctrl+Z)" disabled>↩ Undo</button>
        <button id="btn-undo-all" class="btn" style="background:#25271f;font-size:.73rem;padding:3px 10px" onclick="undoAll()">Undo All Edits</button>
      </div>
    </div>
  </div>
</div>
<div id="graph-wrap"><canvas id="depgraph" role="img" aria-label="Token dependency graph showing transformed vs untransformed token positions"></canvas></div>
<div id="perp-spark-wrap"><div style="font-size:.65rem;color:#96917f;margin:2px 0">Perplexity (last 60 tokens)</div><svg id="perp-spark" viewBox="0 0 600 40" preserveAspectRatio="none" role="img" aria-label="Perplexity sparkline for last 60 tokens"><title>Perplexity over last 60 tokens</title><polyline id="perp-line" points="" fill="none" stroke="#e8c872" stroke-width="1.5"/></svg></div>
<div id="conf-spark-wrap" style="padding:4px 24px;background:#090a08;border-top:1px solid #25271f;display:none">
  <div style="font-size:.65rem;color:#96917f;margin-bottom:2px">Confidence (last 60 tokens)</div>
  <canvas id="sparkline" width="600" height="60" style="display:block;background:#141512;border-radius:4px;width:100%;max-width:600px" role="img" aria-label="Confidence sparkline for last 60 tokens"></canvas>
</div>
<div id="stats"></div>
<div id="research-dash"></div>

<!-- Multiplayer session panel -->
<div id="mp-panel">
  <div><div class="mp-label">Room Code</div><div class="mp-code" id="mp-code" title="Click to copy join link">------</div></div>
  <div><div class="mp-label">Participants</div><span id="mp-count-badge">1</span></div>
  <button class="btn" style="background:#238636;font-size:.75rem;padding:4px 11px" id="btn-copy-link">Copy Link</button>
  <button class="btn" style="background:#6e40c9;font-size:.75rem;padding:4px 11px;display:none" id="btn-replay" aria-label="Replay recording">▶ Replay</button>
  <div id="replay-prog"><div id="replay-bar"></div></div>
  <div style="display:flex;align-items:center;gap:4px;font-size:.72rem;color:#96917f">
    <span>Speed:</span>
    <input type="range" id="replay-speed" min="1" max="10" value="3" style="width:60px;accent-color:#a371f7">
    <span id="speed-label">3×</span>
  </div>
  <button class="btn" id="btn-rec" style="background:#36382f;font-size:.75rem;padding:4px 11px" aria-label="Record session">⏺ Record</button>
  <button class="btn" style="background:#25271f;font-size:.75rem;padding:4px 11px;margin-left:auto" id="btn-leave">Leave</button>
</div>
<!-- Vote bar -->
<div id="vote-bar" role="region" aria-label="Transform voting">
  <span style="color:#96917f;font-size:.7rem">Transform vote:</span>
  <button class="v-btn" id="btn-vote-up">👍 <span id="vote-up-n">0</span></button>
  <button class="v-btn" id="btn-vote-dn">👎 <span id="vote-dn-n">0</span></button>
  <span id="vote-label" style="font-size:.7rem;color:#5f5b50"></span>
</div>
<!-- Participant sidebar -->
<div id="sidebar" role="complementary" aria-label="Participants">
  <div id="sidebar-hdr">
    <span>Participants</span>
    <button onclick="$('#chat-panel').classList.toggle('show')" style="background:none;border:none;color:#96917f;cursor:pointer;font-size:.8rem" title="Toggle chat">💬</button>
  </div>
  <div id="participant-list"></div>
</div>
<!-- Chat panel -->
<div id="chat-panel" role="complementary" aria-label="Chat">
  <div id="chat-hdr">Chat</div>
  <div id="chat-msgs"></div>
  <div id="chat-wrap">
    <input type="text" id="chat-in" placeholder="Message…" autocomplete="off">
    <button id="chat-btn">Send</button>
  </div>
</div>
<div id="toast-container"></div>
<div id="shortcuts-modal" role="dialog" aria-modal="true" aria-label="Keyboard shortcuts">
  <div id="shortcuts-box">
    <button id="shortcuts-close" aria-label="Close shortcuts">✕</button>
    <h2>Keyboard Shortcuts</h2>
    <table>
      <tr><td>?</td><td>Show this help</td></tr>
      <tr><td>Ctrl+Z</td><td>Undo last token surgery</td></tr>
      <tr><td>Enter</td><td>Submit prompt</td></tr>
      <tr><td>Escape</td><td>Close modal / cancel edit</td></tr>
      <tr><td>Ctrl+E</td><td>Export session as JSON</td></tr>
      <tr><td>Ctrl+Shift+E</td><td>Export session as CSV</td></tr>
    </table>
  </div>
</div>
<script>
const $=s=>document.querySelector(s);
const $$=s=>document.querySelectorAll(s);
function showNotice(msg, type='info') {
  const c = document.getElementById('toast-container');
  if (!c) return;
  const t = document.createElement('div');
  t.className = 'toast toast-' + type;
  t.textContent = msg;
  c.appendChild(t);
  setTimeout(() => t.remove(), 4000);
}

/* ---- Transform functions (JS mirrors of Rust) ---- */
const TX={
  reverse:s=>s.split('').reverse().join(''),
  uppercase:s=>s.toUpperCase(),
  mock:s=>s.split('').map((c,i)=>i%2===0?c.toLowerCase():c.toUpperCase()).join(''),
  noise:s=>{const n='*+~@#$%';return s+n[Math.floor(Math.random()*n.length)]},
  chaos:s=>{const picks=['reverse','uppercase','mock','noise'];const k=picks[Math.floor(Math.random()*4)];return TX[k](s)}
};

/* ---- Application state ---- */
/* Stream state */
let es=null, mode='single';
/* Token data */
let allTokens=[], graphNodes=[], surgeryLog=[], undoStack=[];
function renderSurgeryHistory() {
  const el = document.getElementById('surgery-history');
  if (!el) return;
  if (surgeryLog.length === 0) { el.innerHTML = '<span style="color:#5f5b50">No edits yet.</span>'; return; }
  const frag=document.createDocumentFragment();
  surgeryLog.slice().reverse().forEach(e=>{
    const row=document.createElement('div');
    row.style.cssText='display:flex;gap:8px;padding:2px 0;border-bottom:1px solid #25271f';
    const idx=document.createElement('span');
    idx.style.cssText='color:#5f5b50;font-size:.7rem;flex-shrink:0';
    idx.textContent='#'+e.index;
    const orig=document.createElement('span');
    orig.style.cssText='color:#f85149;text-decoration:line-through;flex:1;overflow:hidden;text-overflow:ellipsis';
    orig.textContent=e.original;
    const repl=document.createElement('span');
    repl.style.cssText='color:#3fb950;flex:1;overflow:hidden;text-overflow:ellipsis';
    repl.textContent='→ '+e.replacement;
    row.appendChild(idx);row.appendChild(orig);row.appendChild(repl);
    frag.appendChild(row);
  });
  el.innerHTML='';
  el.appendChild(frag);
}
function undoAll() {
  while (undoStack.length) {
    const last = undoStack.pop();
    last.sp.textContent = last.oldText;
    if (last.idx >= 0 && allTokens[last.idx]) allTokens[last.idx].text = last.oldText;
  }
  surgeryLog.length = 0;
  renderSurgeryHistory();
  if(typeof updateUndoBtnState==='function')updateUndoBtnState();
}
/* Sparkline windows */
let perpWindow=[], confWindow=[];
/* Experiment tokens */
let expATokens=[], expBTokens=[];
/* Performance */
let scrollPending=false;
/* SSE reconnect timer handle */
let _streamRetryTimer=null;
/* Research cache */
let _researchCache={len:-1};
const views={single:$('#v-single'),sbs:$('#v-sbs'),multi:$('#v-multi'),diff:$('#v-diff'),experiment:$('#v-experiment'),research:$('#v-research')};

/* ---- View mode switching ---- */
function setMode(m){
  mode=m;
  Object.values(views).forEach(v=>{if(v)v.style.display='none'});
  if(m==='experiment'){$('#v-experiment').style.display='';$('#ab-prompts').classList.add('show')}
  else{if(views[m])views[m].style.display='';$('#ab-prompts').classList.remove('show')}
  $$('.btn-mode').forEach(b=>b.classList.remove('active'));
  $('#btn-'+m)&&$('#btn-'+m).classList.add('active');
  if(m==='research')renderResearch();
}
$('#btn-single').onclick=()=>setMode('single');
$('#btn-sbs').onclick=()=>setMode('sbs');
$('#btn-multi').onclick=()=>setMode('multi');
$('#btn-diff').onclick=()=>{setMode('diff');if(!es)startDiff()};
$('#btn-experiment').onclick=()=>setMode('experiment');
$('#btn-research').onclick=()=>setMode('research');

/* ---- Graph toggle ---- */
$('#graphtoggle').onchange=function(){
  $('#graph-wrap').classList.toggle('show',this.checked);
  if(this.checked)drawGraph();
};

/* ---- Helpers ---- */
function mkSpan(text,isOdd,importance,extraCls,chaosLabel,confidence,perplexity){
  const s=document.createElement('span');
  s.className='token '+(isOdd?'odd':'even');
  if(extraCls)s.classList.add(extraCls);
  if($('#heatmap').checked){
    const h=importance>=.8?4:importance>=.6?3:importance>=.4?2:importance>=.2?1:0;
    s.classList.add('heat-'+h);
  }
  /* Deleted token placeholder */
  if(chaosLabel==='deleted'||text===''){
    s.textContent='⌀';
    s.classList.add('token-deleted');
    s.title='Token deleted';
    s.style.opacity='0.4';
  }
  if(chaosLabel&&isOdd&&chaosLabel!=='deleted')s.title='chaos → '+chaosLabel;
  /* Confidence bar: colored underline */
  if(confidence!=null){
    const cls=confidence>=0.7?'conf-high':confidence>=0.4?'conf-mid':'conf-low';
    s.classList.add(cls);
    s.title=(s.title?s.title+' | ':'')+('conf: '+(confidence*100).toFixed(0)+'%');
  }
  /* Perplexity pulse for surprising tokens (perplexity > 5) */
  if(perplexity!=null&&perplexity>5)s.classList.add('high-perp');
  if(chaosLabel!=='deleted'&&text!==''){
    /* Leading whitespace sits outside the confidence underline. */
    const m=/^(\s+)(\S[\s\S]*)$/.exec(text);
    if(m){s.dataset.ws=m[1];s.textContent=m[2];}else s.textContent=text;
  }
  s.addEventListener('contextmenu',function(e){
    e.preventDefault();
    navigator.clipboard&&navigator.clipboard.writeText(s.textContent).then(()=>{
      const orig=s.style.outline;s.style.outline='1px solid #3fb950';
      setTimeout(()=>s.style.outline=orig,600);
    });
  });
  return s;
}

/* Append a token span; its leading whitespace goes in as plain text so the
   confidence underline and line wrapping only apply to the word itself. */
function appendTok(container,sp){
  const ws=sp.dataset.ws;
  if(ws){container.appendChild(document.createTextNode(ws));delete sp.dataset.ws;}
  container.appendChild(sp);
}

/* ---- Token search/filter ---- */
$('#token-search').addEventListener('input',function(){
  const q=this.value.toLowerCase();
  $$('#v-single .token').forEach(sp=>{
    sp.style.opacity=(!q||sp.textContent.toLowerCase().includes(q))?'':'0.15';
    sp.style.outline=(!q||sp.textContent.toLowerCase().includes(q))?'':'1px solid #e3b341';
  });
});

/* ---- Perplexity sparkline ---- */
function updatePerpSparkline(perplexity){
  if(perplexity==null)return;
  perpWindow.push(perplexity);
  if(perpWindow.length>60)perpWindow.shift();
  const spark=$('#perp-spark-wrap');
  if(!spark)return;
  spark.classList.add('show');
  const line=$('#perp-line');
  if(!line)return;
  const max=Math.max(...perpWindow,1);
  const pts=perpWindow.map((v,i)=>{
    const x=Math.round(i/(perpWindow.length-1||1)*600);
    const y=Math.round((1-v/max)*36+2);
    return x+','+y;
  }).join(' ');
  line.setAttribute('points',pts);
}

/* Sparkline hover tooltip */
(function(){
  const svg = document.getElementById('perp-spark');
  if (!svg) return;
  const tip = document.createElement('div');
  tip.id = 'spark-tip';
  tip.style.cssText = 'display:none;position:fixed;background:#1c2333;color:#a371f7;padding:2px 8px;border-radius:4px;font-size:.7rem;pointer-events:none;z-index:100;border:1px solid #36382f';
  document.body.appendChild(tip);
  svg.addEventListener('mousemove', e => {
    if (!perpWindow.length) return;
    const rect = svg.getBoundingClientRect();
    const frac = (e.clientX - rect.left) / rect.width;
    const idx = Math.min(perpWindow.length - 1, Math.max(0, Math.round(frac * (perpWindow.length - 1))));
    tip.textContent = 'token ' + idx + ': perplexity ' + perpWindow[idx].toFixed(2);
    tip.style.display = '';
    tip.style.left = (e.clientX + 12) + 'px';
    tip.style.top = (e.clientY - 8) + 'px';
  });
  svg.addEventListener('mouseleave', () => { tip.style.display = 'none'; });
})();

/* ---- Welch's t-test for significance testing ---- */
function welchT(a, b) {
  if (a.length < 2 || b.length < 2) return null;
  const ma = a.reduce((s,x)=>s+x,0)/a.length;
  const mb = b.reduce((s,x)=>s+x,0)/b.length;
  const va = a.reduce((s,x)=>s+(x-ma)**2,0)/(a.length-1);
  const vb = b.reduce((s,x)=>s+(x-mb)**2,0)/(b.length-1);
  const se = Math.sqrt(va/a.length + vb/b.length);
  if (se === 0) return null;
  const t = Math.abs(ma - mb) / se;
  // Normal CDF approximation for p-value (two-tailed)
  const normalCDF = z => {
    const t = 1/(1+0.2316419*Math.abs(z));
    const poly = t*(0.319381530+t*(-0.356563782+t*(1.781477937+t*(-1.821255978+t*1.330274429))));
    const pdf = Math.exp(-z*z/2)/Math.sqrt(2*Math.PI);
    const p = 1 - pdf*poly;
    return z >= 0 ? p : 1-p;
  };
  const p = 2*(1-normalCDF(t));
  return {t, p, ma, mb, na: a.length, nb: b.length};
}

function updateSigTest(tokens) {
  const evenConf = tokens.filter((_,i)=>i%2===0).map(t=>t.confidence).filter(c=>c!=null);
  const oddConf = tokens.filter((_,i)=>i%2!==0).map(t=>t.confidence).filter(c=>c!=null);
  const el = document.getElementById('sig-test-result');
  if (!el) return;
  const r = welchT(evenConf, oddConf);
  if (!r) {
    el.innerHTML = '<span style="color:#5f5b50">Not enough confidence data for t-test (need OpenAI provider).</span>';
    return;
  }
  const sig = r.p < 0.05;
  const color = sig ? '#f85149' : '#3fb950';
  el.innerHTML = `

    <div style="display:flex;gap:16px;flex-wrap:wrap">

      <div><span style="color:#96917f">Even tokens mean conf:</span> <strong style="color:#e8c872">${r.ma.toFixed(4)}</strong> (n=${r.na})</div>

      <div><span style="color:#96917f">Odd tokens mean conf:</span> <strong style="color:#a371f7">${r.mb.toFixed(4)}</strong> (n=${r.nb})</div>

      <div><span style="color:#96917f">t-statistic:</span> <strong style="color:#e3b341">${r.t.toFixed(3)}</strong></div>

      <div><span style="color:#96917f">p-value:</span> <strong style="color:${color}">${r.p.toFixed(4)}</strong></div>

      <div style="padding:2px 8px;border-radius:3px;background:${sig?'#2d1b1b':'#0d2010'};color:${color};font-size:.75rem">${sig?'⚠ SIGNIFICANT (p<0.05)':'✓ Not significant'}</div>

    </div>`;
}

/* ---- Perplexity histogram ---- */
function renderPerpHist(binCount){
    const hist=document.getElementById('research-perp-hist');
    if(!hist)return;
    const withPerp=allTokens.filter(t=>t.perplexity!=null);
    if(!withPerp.length)return;
    const maxP=Math.max(...withPerp.map(t=>t.perplexity));
    const minP=Math.min(...withPerp.map(t=>t.perplexity));
    const buckets=Array(binCount).fill(0);
    withPerp.forEach(t=>{
        const b=Math.min(binCount-1,Math.floor((t.perplexity-minP)/(maxP-minP+1e-9)*binCount));
        buckets[b]++;
    });
    const maxB=Math.max(...buckets,1);
    hist.innerHTML=buckets.map((v,i)=>{
        const lo=(minP+(maxP-minP)/binCount*i).toFixed(1);
        const hi=(minP+(maxP-minP)/binCount*(i+1)).toFixed(1);
        return `<div style="flex:1;background:#a371f7;height:${Math.round(v/maxB*44)+2}px;border-radius:2px 2px 0 0" title="${lo}–${hi}: ${v}"></div>`;
    }).join('');
}

/* ---- Research run progress (item 5) ---- */
let _researchRunCurrent = 0, _researchRunTotal = 0;
function setResearchProgress(cur, total) {
  _researchRunCurrent = cur; _researchRunTotal = total;
  const el = document.getElementById('research-progress');
  if (el) el.textContent = total > 0 ? 'Run ' + cur + '/' + total + (cur < total ? '...' : ' ✓') : '';
}

/* ---- Research Dashboard ---- */
function renderResearch(){
  /* Skip recompute if token data hasn't changed */
  if(allTokens.length===_researchCache.len&&allTokens.length>0&&mode==='research'){
    /* still re-render sig test which can change on A/B runs */
    updateSigTest(allTokens);return;
  }
  _researchCache.len=allTokens.length;
  const grid=$('#research-grid');
  const perpList=$('#research-perp-list');
  const confHist=$('#research-conf-hist');
  const citation=$('#research-citation');
  if(!grid)return;
  if(allTokens.length===0){grid.innerHTML='<div style="color:#96917f;font-size:.8rem">No tokens yet. Run a stream first.</div>';return;}
  /* Vocab diversity */
  const unique=new Set(allTokens.map(t=>t.original.toLowerCase())).size;
  const diversity=(unique/allTokens.length).toFixed(3);
  /* Avg token length */
  const avgLen=(allTokens.reduce((s,t)=>s+t.original.length,0)/allTokens.length).toFixed(1);
  /* Perplexity stats */
  const withPerp=allTokens.filter(t=>t.perplexity!=null);
  const avgPerp=withPerp.length>0?(withPerp.reduce((s,t)=>s+t.perplexity,0)/withPerp.length).toFixed(2):'n/a';
  /* Confidence stats */
  const withConf=allTokens.filter(t=>t.confidence!=null);
  const avgConf=withConf.length>0?((withConf.reduce((s,t)=>s+t.confidence,0)/withConf.length)*100).toFixed(0)+'%':'n/a';
  /* Cost estimate (GPT-3.5 pricing: ~$0.002/1K tokens) */
  const costEst=allTokens.length>0?'$'+(allTokens.length/1000*0.002).toFixed(4):'n/a';
  grid.innerHTML=`

    <div class="dash-card"><h3>Vocab Diversity</h3><div class="val">${diversity}</div><div class="sub">${unique} unique / ${allTokens.length} total</div></div>

    <div class="dash-card"><h3>Avg Token Length</h3><div class="val">${avgLen}</div><div class="sub">characters per token</div></div>

    <div class="dash-card"><h3>Avg Perplexity</h3><div class="val">${avgPerp}</div><div class="sub">exp(-logprob); lower=confident</div></div>

    <div class="dash-card"><h3>Avg Confidence</h3><div class="val">${avgConf}</div><div class="sub">from top-1 logprob</div></div>

    <div class="dash-card"><h3>Token Count</h3><div class="val">${allTokens.length}</div><div class="sub">${allTokens.filter(t=>t.transformed).length} transformed</div></div>

    <div class="dash-card"><h3>Est. Cost</h3><div class="val">${costEst}</div><div class="sub">GPT-3.5 rate ($0.002/1K)</div></div>

  `.replace(/dash-card/g,'r-card').replace(/class="val"/g,'class="r-stat"').replace(/class="sub"/g,'class="r-sub"');
  /* Top 10 perplexity tokens */
  if(perpList){
    const sorted=[...withPerp].sort((a,b)=>b.perplexity-a.perplexity).slice(0,10);
    perpList.innerHTML=sorted.map((t,i)=>`<li style="display:flex;justify-content:space-between;padding:3px 0;border-bottom:1px solid #25271f;font-size:.78rem"><span style="color:#e6e1d3">${i+1}. "${t.original}"</span><span style="color:#f85149">${t.perplexity.toFixed(1)}</span></li>`).join('');
  }
  /* Confidence histogram (10 buckets) */
  if(confHist&&withConf.length>0){
    const buckets=Array(10).fill(0);
    withConf.forEach(t=>{const b=Math.min(9,Math.floor(t.confidence*10));buckets[b]++});
    const maxB=Math.max(...buckets,1);
    confHist.innerHTML=buckets.map((v,i)=>`<div style="flex:1;background:#4d4b3e;height:${Math.round(v/maxB*44)+2}px;border-radius:2px 2px 0 0;opacity:${0.4+i*0.06}" title="${(i*10)}-${(i+1)*10}%: ${v} tokens"></div>`).join('');
  }
  /* Citation */
  if(citation){
    const ts=new Date().toISOString().replace('T',' ').replace(/\.\d+Z$/,' UTC');
    citation.textContent=`Every Other Token (v4.0.0). Session recorded ${ts}.\nTokens: ${allTokens.length}, Transform: ${$('#transform').value}, Provider: ${$('#provider').value}, Model: ${$('#model').value||'auto'}.\nVocab diversity: ${diversity}, Avg perplexity: ${avgPerp}, Avg confidence: ${avgConf}.`;
  }
  /* Significance test */
  updateSigTest(allTokens);
  /* Perplexity histogram */
  renderPerpHist(10);
  /* Wire perplexity bin slider */
  const perpSlider=document.getElementById('perp-bin-slider');
  if(perpSlider){
    perpSlider.oninput=function(){
      document.getElementById('perp-bin-count').textContent=this.value;
      renderPerpHist(parseInt(this.value));
    };
  }
}

/* ---- A/B Experiment streaming ---- */
let expATokens2=[], expBTokens2=[];
function startExperiment(){
  if(es){es.close();es=null}
  $('#exp-a').innerHTML='<span class="exp-label">System Prompt A</span>';
  $('#exp-b').innerHTML='<span class="exp-label b">System Prompt B</span>';
  $('#exp-diverge').innerHTML='<span style="font-size:.7rem;color:#96917f">Divergence map: streaming...</span>';
  expATokens2=[];expBTokens2=[];
  const p=encodeURIComponent($('#prompt').value);
  const t=$('#transform').value;
  const m=encodeURIComponent($('#model').value);
  const sa=encodeURIComponent(($('#sysprompt-a')&&$('#sysprompt-a').value)||'You are a creative storyteller.');
  const sb=encodeURIComponent(($('#sysprompt-b')&&$('#sysprompt-b').value)||'You are a technical writer. Be precise.');
  const prov=$('#provider').value;
  const url='/ab-stream?prompt='+p+'&transform='+t+'&provider='+prov+'&model='+m+'&sys_a='+sa+'&sys_b='+sb;
  $('#start').disabled=true;$('#start').textContent='Experimenting...';
  es=new EventSource(url);
  es.onmessage=e=>{
    if(e.data==='[DONE]'){
      es.close();es=null;
      $('#start').disabled=false;$('#start').textContent='Stream';
      renderExpDivergence();
      return;
    }
    try{
      const tk=JSON.parse(e.data);
      if(tk.side==='a'){
        expATokens2.push(tk);
        const sp=mkSpan(tk.text,tk.transformed,tk.importance,'',tk.chaos_label,tk.confidence,tk.perplexity);
        sp.dataset.idx=tk.index;
        appendTok($('#exp-a'),sp);$('#exp-a').scrollTop=$('#exp-a').scrollHeight;
        updatePerpSparkline(tk.perplexity);
      } else if(tk.side==='b'){
        expBTokens2.push(tk);
        const sp=mkSpan(tk.text,tk.transformed,tk.importance,'',tk.chaos_label,tk.confidence,tk.perplexity);
        sp.dataset.idx=tk.index;
        appendTok($('#exp-b'),sp);$('#exp-b').scrollTop=$('#exp-b').scrollHeight;
      }
      $('#stats').textContent='A: '+expATokens2.length+' tokens | B: '+expBTokens2.length+' tokens';
    }catch(err){console.warn('[eot] token parse error:', err);}
  };
  es.onerror=()=>{
  es.close();es=null;
  $('#start').disabled=false;$('#start').textContent='Stream';
  showNotice('Stream interrupted or disconnected.','warning');
};;
}
function renderExpDivergence(){
  const el=$('#exp-diverge');if(!el)return;
  const minLen=Math.min(expATokens2.length,expBTokens2.length);
  if(minLen===0){el.innerHTML='<span style="font-size:.7rem;color:#96917f">No tokens to compare.</span>';return;}
  let matches=0;
  const rows=[];
  for(let i=0;i<minLen;i++){
    const match=expATokens2[i].original===expBTokens2[i].original;
    if(match)matches++;
    rows.push(`<div style="display:flex;gap:8px;font-size:.75rem;padding:1px 0;color:${match?'#3fb950':'#f85149'}"><span style="flex:1;overflow:hidden;text-overflow:ellipsis">${escHtml(expATokens2[i].original)}</span><span style="flex:1;overflow:hidden;text-overflow:ellipsis">${escHtml(expBTokens2[i].original)}</span></div>`);
  }
  const pct=Math.round(matches/minLen*100);
  el.innerHTML=`<div style="font-size:.7rem;color:#96917f;margin-bottom:4px">Similarity: ${pct}% (${matches}/${minLen})</div>`+rows.slice(0,50).join('');
  /* Hook for A/B chart enhancement (item 9) */
  if(typeof _renderExpDivergenceExtra==='function')_renderExpDivergenceExtra(expATokens2,expBTokens2,minLen,matches);
}

/* ---- Token surgery ---- */
function enableSurgery(container){
  container.querySelectorAll('.token').forEach(sp=>{
    if(sp.classList.contains('surgeable'))return;
    sp.classList.add('surgeable');
    sp.addEventListener('click',function(){
      const orig=sp.textContent;
      const inp=document.createElement('input');
      inp.className='token-input';
      inp.value=orig;
      inp.style.width=Math.max(orig.length*0.6+1,2)+'em';
      sp.replaceWith(inp);
      inp.focus();inp.select();
      function commit(){
        const newText=inp.value||orig;
        sp.textContent=newText;
        inp.replaceWith(sp);
        if(newText!==orig){
          undoStack.push({sp, oldText: orig, newText, idx: parseInt(sp.dataset.idx || '-1')});
          surgeryLog.push({index:parseInt(sp.dataset.idx||'0'),original:orig,replacement:newText,timestamp:new Date().toISOString()});
          renderSurgeryHistory();
          if(typeof updateUndoBtnState==='function')updateUndoBtnState();
          if(ws&&ws.readyState===WebSocket.OPEN){try{ws.send(JSON.stringify({type:'surgery',token_index:parseInt(sp.dataset.idx||'0'),old_text:orig,new_text:newText}))}catch(e){console.warn('[eot] ws surgery send failed:',e);}}
        }
      }
      inp.addEventListener('blur',commit);
      inp.addEventListener('keydown',e=>{if(e.key==='Enter')inp.blur();if(e.key==='Escape'){inp.value=orig;inp.blur()}});
    });
  });
}

function heatColor(imp){
  if(imp>=.8)return'#f85149';
  if(imp>=.6)return'#f0883e';
  if(imp>=.4)return'#e3b341';
  if(imp>=.2)return'#e8c872';
  return'#5f5b50';
}

/* ---- Canvas dependency graph ---- */
function drawGraph(){
  const canvas=$('#depgraph');
  if(!canvas||!$('#graphtoggle').checked)return;
  const dpr=window.devicePixelRatio||1;
  const rect=canvas.parentElement.getBoundingClientRect();
  const nodes=graphNodes;
  if(nodes.length===0)return;
  const gap=60;
  /* Cache x positions to avoid redundant arithmetic */
  const xs=nodes.map((_,i)=>(i+1)*gap);
  const neededW=Math.max((nodes.length+1)*gap,rect.width);
  canvas.width=neededW*dpr;
  canvas.height=200*dpr;
  canvas.style.width=neededW+'px';
  canvas.style.height='200px';
  const ctx=canvas.getContext('2d');
  ctx.scale(dpr,dpr);
  ctx.clearRect(0,0,neededW,200);
  const y1=50,y2=150;
  /* Draw nodes and edges */
  let lastEvenX=0,lastEvenIdx=-1;
  for(let i=0;i<nodes.length;i++){
    const n=nodes[i];
    const x=xs[i];
    const y=n.transformed?y2:y1;
    /* If odd, draw line to previous even */
    if(n.transformed&&lastEvenIdx>=0){
      const ex=(lastEvenIdx+1)*gap;
      ctx.beginPath();
      ctx.moveTo(ex,y1+8);
      ctx.bezierCurveTo(ex,y1+40,x,y2-40,x,y2-8);
      ctx.lineWidth=Math.min(n.original.length,6);
      ctx.strokeStyle=heatColor(n.importance);
      ctx.globalAlpha=0.6;
      ctx.stroke();
      ctx.globalAlpha=1;
    }
    if(!n.transformed){lastEvenX=x;lastEvenIdx=i;}
    /* Node circle */
    ctx.beginPath();
    ctx.arc(x,y,7,0,Math.PI*2);
    ctx.fillStyle=n.transformed?'#ff6a2b':'#e6e1d3';
    ctx.fill();
    ctx.strokeStyle='#36382f';ctx.lineWidth=1;ctx.stroke();
    /* Label */
    ctx.fillStyle='#96917f';
    ctx.font='10px monospace';
    ctx.textAlign='center';
    const label=n.text.length>6?n.text.slice(0,5)+'…':n.text;
    ctx.fillText(label,x,y+(n.transformed?20:-14));
  }
}

/* ---- Streaming ---- */
$('#start').onclick=()=>{
  if(es){es.close();es=null}
  if(_streamRetryTimer){clearTimeout(_streamRetryTimer);_streamRetryTimer=null;}
  if(mode==='diff'){startDiff();return}
  if(mode==='experiment'){startExperiment();return}
  /* Research multi-run mode (item 5) */
  if(mode==='research'){
    const totalRuns = Math.max(1, parseInt(document.getElementById('research-runs')&&document.getElementById('research-runs').value||'1'));
    if(totalRuns > 1) {
      let runNum = 0;
      setResearchProgress(0, totalRuns);
      function doResearchRun() {
        if(runNum >= totalRuns) { setResearchProgress(totalRuns, totalRuns); return; }
        runNum++;
        setResearchProgress(runNum, totalRuns);
        /* Start a single stream run; when done, schedule the next */
        /* We will let fall through to normal stream code, then intercept [DONE] */
      }
      doResearchRun();
    }
  }
  /* Clear all views */
  $('#v-single').innerHTML='';
  $('#sbs-orig').innerHTML='<span class="sbs-label">Original</span>';
  $('#sbs-xform').innerHTML='<span class="sbs-label">Transformed</span>';
  ['reverse','uppercase','mock','noise','chaos'].forEach(t=>{
    const el=$('#mp-'+t);if(el)el.innerHTML='<span class="multi-label">'+t+'</span>';
  });
  $('#stats').textContent='';
  allTokens=[];graphNodes=[];surgeryLog=[];undoStack=[];
  perpWindow=[];confWindow=[];_researchCache={len:-1};
  _sseQueue.length=0; _stopSseFlush();
  _streamStart = Date.now();
  if($('#graphtoggle').checked)drawGraph();

  const p=encodeURIComponent($('#prompt').value);
  const txVal = (_chainModeActive && chainTransforms.length) ? chainTransforms.join(',') : $('#transform').value;
  const prov=$('#provider').value;
  const m=encodeURIComponent($('#model').value);
  const hm=$('#heatmap').checked?'1':'0';
  const minConf = parseInt($('#min-confidence').value||'0');
  const minConfParam = minConf > 0 ? '&min_confidence='+(minConf/100) : '';
  const roomParam=roomCode?'&room='+encodeURIComponent(roomCode):'';
  const url='/stream?prompt='+p+'&transform='+encodeURIComponent(txVal)+'&provider='+prov+'&model='+m+'&heatmap='+hm+minConfParam+roomParam;
  $('#start').disabled=true;$('#start').textContent='Streaming...';
  let count=0,xformed=0,streamDone=false;
  const _countRef={count:0}, _xformedRef={xformed:0}, _modeRef={mode};
  /* Auto-reconnect state */
  let _retryCount=0;
  const MAX_RETRIES=4;

  function attachStreamHandlers(evSrc){
    evSrc.onmessage=e=>{
      _retryCount=0; /* reset on successful message */
      if(e.data==='[DONE]'){
        streamDone=true;
        evSrc.close();es=null;
        /* Render whatever is still queued, then finish. Clearing the queue
           here dropped every token of a fast stream (e.g. the mock provider). */
        _finishSseFlush(()=>{
          $('#start').disabled=false;$('#start').textContent='Stream';
          if($('#graphtoggle').checked)drawGraph();
          enableSurgery($('#v-single'));
          enableSurgery($('#sbs-orig'));
          enableSurgery($('#sbs-xform'));
          renderResearch();
          updateUndoBtnState();
        });
        return;
      }
      try{
        const tk=JSON.parse(e.data);
        allTokens.push(tk);
        window.tokenLog.push(tk);
        /* Push to SSE queue for batched rendering */
        _sseQueue.push(tk);
      }catch(err){console.warn('[eot] token parse error:', err);}
    };
    evSrc.onerror=()=>{
      if(streamDone)return; /* normal close after [DONE] */
      evSrc.close();es=null;
      if(_retryCount<MAX_RETRIES){
        const delay=Math.min(1000*Math.pow(2,_retryCount),16000);
        _retryCount++;
        $('#stats').textContent='Connection lost: reconnecting in '+(delay/1000).toFixed(0)+'s… (attempt '+_retryCount+'/'+MAX_RETRIES+')';
        _streamRetryTimer=setTimeout(()=>{
          es=new EventSource(url);
          attachStreamHandlers(es);
        },delay);
      } else {
        $('#start').disabled=false;$('#start').textContent='Stream';
        showNotice('Stream disconnected after '+MAX_RETRIES+' retries.','warning');
      }
    };
  }

  /* Start SSE flush loop */
  _countRef.count=0; _xformedRef.xformed=0; _modeRef.mode=mode;
  _startSseFlush(_countRef, _xformedRef, _modeRef);
  /* 429 preflight check before opening EventSource */
  (async()=>{
    try{
      const probe=await fetch(url,{method:'HEAD',signal:AbortSignal.timeout(3000)});
      if(probe.status===429){
        _stopSseFlush();
        $('#start').disabled=false;$('#start').textContent='Stream';
        showNotice('Rate limited (429): please wait 60s','error');
        return;
      }
    }catch(_){}
    es=new EventSource(url);
    attachStreamHandlers(es);
  })();
  updateUndoBtnState();
};

/* ---- Diff streaming ---- */
let diffOpenaiTokens=[], diffAnthropicTokens=[];
function startDiff(){
  if(es){es.close();es=null}
  $('#diff-openai').innerHTML='<span class="diff-label">OpenAI</span>';
  $('#diff-anthropic').innerHTML='<span class="diff-label">Anthropic</span>';
  diffOpenaiTokens=[];diffAnthropicTokens=[];
  $('#stats').textContent='';
  const p=encodeURIComponent($('#prompt').value);
  const t=$('#transform').value;
  const m=encodeURIComponent($('#model').value);
  const hm=$('#heatmap').checked?'1':'0';
  const url='/diff-stream?prompt='+p+'&transform='+t+'&model='+m+'&heatmap='+hm;
  $('#start').disabled=true;$('#start').textContent='Diffing...';
  es=new EventSource(url);
  es.onmessage=e=>{
    if(e.data==='[DONE]'){
      es.close();es=null;
      $('#start').disabled=false;$('#start').textContent='Stream';
      applyDiffHighlights();
      return;
    }
    try{
      const tk=JSON.parse(e.data);
      if(tk.side==='openai'){
        diffOpenaiTokens.push(tk);
        const sp=mkSpan(tk.text,tk.transformed,tk.importance,'',tk.chaos_label);
        sp.dataset.idx=tk.index;
        appendTok($('#diff-openai'),sp);
        $('#diff-openai').scrollTop=$('#diff-openai').scrollHeight;
      } else if(tk.side==='anthropic'){
        diffAnthropicTokens.push(tk);
        const sp=mkSpan(tk.text,tk.transformed,tk.importance,'',tk.chaos_label);
        sp.dataset.idx=tk.index;
        appendTok($('#diff-anthropic'),sp);
        $('#diff-anthropic').scrollTop=$('#diff-anthropic').scrollHeight;
      }
      $('#stats').textContent='OpenAI: '+diffOpenaiTokens.length+' tokens | Anthropic: '+diffAnthropicTokens.length+' tokens';
    }catch(err){console.warn('[eot] token parse error:', err);}
  };
  es.onerror=()=>{
  es.close();es=null;
  $('#start').disabled=false;$('#start').textContent='Stream';
  showNotice('Stream interrupted or disconnected.','warning');
};;
}
function applyDiffHighlights(){
  const oSpans=Array.from($('#diff-openai').querySelectorAll('.token'));
  const aSpans=Array.from($('#diff-anthropic').querySelectorAll('.token'));
  let matches=0;
  const total=Math.max(oSpans.length,aSpans.length);
  for(let i=0;i<total;i++){
    const match=oSpans[i]&&aSpans[i]&&oSpans[i].textContent===aSpans[i].textContent;
    if(oSpans[i])oSpans[i].classList.add(match?'diff-match':'diff-diverge');
    if(aSpans[i])aSpans[i].classList.add(match?'diff-match':'diff-diverge');
    if(match)matches++;
  }
  const pct=total>0?Math.round(matches/total*100):0;
  $('#stats').textContent='Match: '+pct+'% ('+matches+'/'+total+') | OpenAI: '+oSpans.length+' tokens | Anthropic: '+aSpans.length+' tokens';
}

/* ---- Confidence sparkline ---- */
function updateConfSparkline(confidence){
  confWindow.push(confidence!=null?confidence:0.5);
  if(confWindow.length>60)confWindow.shift();
  const wrap=$('#conf-spark-wrap');if(wrap)wrap.style.display='';
  const canvas=$('#sparkline');if(!canvas)return;
  const ctx=canvas.getContext('2d');
  const w=canvas.width,h=canvas.height;
  ctx.clearRect(0,0,w,h);
  ctx.fillStyle='#141512';ctx.fillRect(0,0,w,h);
  if(confWindow.length<2)return;
  const avg=confWindow.reduce((a,b)=>a+b,0)/confWindow.length;
  const color=avg>=0.7?'#7fd69f':avg>=0.4?'#e8c872':'#ff6a6a';
  ctx.beginPath();ctx.strokeStyle=color;ctx.lineWidth=2;
  confWindow.forEach((v,i)=>{
    const x=Math.round(i/(confWindow.length-1)*w);
    const y=Math.round((1-v)*h);
    i===0?ctx.moveTo(x,y):ctx.lineTo(x,y);
  });
  ctx.stroke();
}

/* ---- Colorblind-safe mode ---- */
(function(){
  if(localStorage.getItem('eot-cb-mode')==='1')document.body.classList.add('cb-mode');
})();
document.getElementById('btn-cb-mode').onclick=function(){
  const on=document.body.classList.toggle('cb-mode');
  localStorage.setItem('eot-cb-mode',on?'1':'0');
  this.classList.toggle('active',on);
};
/* Reflect saved cb-mode on btn on load */
(function(){if(document.body.classList.contains('cb-mode'))document.getElementById('btn-cb-mode').classList.add('active');})();

/* ---- Dark/light theme toggle ---- */
(function(){
  const saved=localStorage.getItem('eot-theme');
  if(saved==='light'){document.body.setAttribute('data-theme','light');if($('#btn-theme'))$('#btn-theme').textContent='☀️';}
})();
$('#btn-theme').onclick=function(){
  const isLight=document.body.getAttribute('data-theme')==='light';
  if(isLight){document.body.removeAttribute('data-theme');this.textContent='🌙';localStorage.setItem('eot-theme','dark');}
  else{document.body.setAttribute('data-theme','light');this.textContent='☀️';localStorage.setItem('eot-theme','light');}
};

/* ---- Persist draft prompt ---- */
(function(){
  const saved=localStorage.getItem('eot-prompt');
  if(saved&&$('#prompt')&&$('#prompt').value==='Tell me a story about a robot')$('#prompt').value=saved;
})();
$('#prompt').addEventListener('input',function(){localStorage.setItem('eot-prompt',this.value);});

/* ---- Export JSON ---- */
window.tokenLog=[];
$('#btn-export').onclick=()=>{
  if(allTokens.length===0){showNotice('No tokens to export. Run a stream first.', 'warning');return}
  const data={
    prompt:$('#prompt').value,
    provider:$('#provider').value,
    model:$('#model').value||'auto',
    transform:$('#transform').value,
    timestamp:new Date().toISOString(),
    exported_at: new Date().toISOString(),
    mode: mode,
    token_count:allTokens.length,
    transformed_count:allTokens.filter(t=>t.transformed).length,
    tokens:allTokens.map(t=>({text:t.text,original:t.original,index:t.index,transformed:t.transformed,importance:t.importance,chaos_label:t.chaos_label||null,confidence:t.confidence,perplexity:t.perplexity,alternatives:t.alternatives||[]})),
    surgery_log:surgeryLog
  };
  const blob=new Blob([JSON.stringify(data,null,2)],{type:'application/json'});
  const url=URL.createObjectURL(blob);
  const a=document.createElement('a');
  a.href=url;a.download='every-other-token-'+Date.now()+'.json';
  document.body.appendChild(a);a.click();a.remove();
  URL.revokeObjectURL(url);
};

/* ---- Export CSV ---- */
$('#btn-export-csv').onclick=()=>{
  if(allTokens.length===0){showNotice('No tokens to export. Run a stream first.', 'warning');return;}
  const meta=[
    '# Every-Other-Token Export',
    '# exported_at: '+new Date().toISOString(),
    '# prompt: '+JSON.stringify(document.getElementById('prompt')?document.getElementById('prompt').value:''),
    '# token_count: '+allTokens.length,
    ''
  ].join('\n');
  const header='index,original,text,transformed,confidence,perplexity\n';
  const rows=allTokens.map(t=>[t.index,JSON.stringify(t.original),JSON.stringify(t.text),t.transformed,t.confidence!=null?t.confidence:'',t.perplexity!=null?t.perplexity:''].join(',')).join('\n');
  const blob=new Blob([meta+header+rows],{type:'text/csv'});
  const url=URL.createObjectURL(blob);
  const a=document.createElement('a');
  a.href=url;a.download='eot_session_'+Date.now()+'.csv';
  document.body.appendChild(a);a.click();a.remove();
  URL.revokeObjectURL(url);
};

/* ---- Import JSON session ---- */
$('#btn-import').onclick=()=>$('#import-file').click();
$('#import-file').onchange=function(){
  const f=this.files[0];if(!f)return;
  const reader=new FileReader();
  reader.onload=ev=>{
    try{
      const data=JSON.parse(ev.target.result);
      if(!Array.isArray(data.tokens))throw new Error('Invalid session file');
      allTokens=data.tokens;graphNodes=data.tokens;surgeryLog=data.surgery_log||[];undoStack=[];
      $('#v-single').innerHTML='';
      const frag=document.createDocumentFragment();
      allTokens.forEach(tk=>{
        const sp=mkSpan(tk.text,tk.transformed,tk.importance,'',tk.chaos_label,tk.confidence,tk.perplexity);
        sp.dataset.idx=tk.index;frag.appendChild(sp);
      });
      $('#v-single').appendChild(frag);
      enableSurgery($('#v-single'));
      renderResearch();
      $('#stats').textContent='Imported: '+allTokens.length+' tokens from '+f.name;
    }catch(e){alert('Import failed: '+e.message);}
  };
  reader.readAsText(f);
  this.value='';
};

/* ---- Resize graph on window resize ---- */
let _resizeTimer=null;
window.addEventListener('resize',()=>{
  clearTimeout(_resizeTimer);
  _resizeTimer=setTimeout(()=>{if($('#graphtoggle').checked)drawGraph();},150);
});

/* ---- Token surgery undo (Ctrl+Z / Cmd+Z) ---- */
document.addEventListener('keydown', function(e){
    if((e.ctrlKey||e.metaKey)&&e.key==='z'&&!e.shiftKey){
        e.preventDefault();
        undoOne();
    }
    if(e.key==='?'&&!e.ctrlKey&&!e.metaKey){
        e.preventDefault();
        document.getElementById('shortcuts-modal').classList.toggle('show');
    }
    if(e.key==='Escape'){
        document.getElementById('shortcuts-modal').classList.remove('show');
    }
    if((e.ctrlKey||e.metaKey)&&e.key==='e'&&!e.shiftKey){
        e.preventDefault();
        document.getElementById('btn-export').click();
    }
    if((e.ctrlKey||e.metaKey)&&e.key==='E'&&e.shiftKey){
        e.preventDefault();
        document.getElementById('btn-export-csv').click();
    }
    if(e.key==='Enter'&&e.target.id==='prompt'&&!e.shiftKey){
        e.preventDefault();
        document.getElementById('start').click();
    }
});

/* ================================================================
   MULTIPLAYER: WebSocket collaboration
   ================================================================ */
let ws=null, myId=null, myColor='#e8c872', myName='Guest', amHost=false;
let roomCode=null, isRecording=false, hasReplay=false;
const peerColors={};

function sendWs(obj){if(ws&&ws.readyState===WebSocket.OPEN){try{ws.send(JSON.stringify(obj));}catch(e){console.warn('[eot] ws send failed:',e);}}}

/* ---- Security helpers ---- */
function escHtml(s){return String(s).replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;').replace(/"/g,'&quot;').replace(/'/g,'&#39;');}
function safeCssColor(c){return/^#[0-9a-fA-F]{3,8}$|^[a-z]+$/i.test(String(c))?String(c):'#e8c872';}

function initRoom(code,asHost){
  roomCode=code; amHost=asHost;
  $('#mp-code').textContent=code;
  $('#mp-panel').classList.add('show');
  $('#sidebar').classList.add('show');
  $('#vote-bar').classList.add('show');
  if(amHost)$('#btn-rec').style.display='';
  document.body.style.paddingRight='200px';
  const proto=location.protocol==='https:'?'wss':'ws';
  ws=new WebSocket(proto+'://'+location.host+'/ws/'+code);
  ws.onopen=()=>{ if(!amHost)sendWs({type:'set_name',name:myName||'Guest'}); };
  ws.onmessage=e=>{try{onWsMsg(JSON.parse(e.data));}catch(_){}};
  ws.onclose=()=>{
    leaveRoom(false);
    if(roomCode)$('#stats').textContent='⚠ Multiplayer connection lost.';
  };
  ws.onerror=e=>{
    console.error('WS',e);
    showToast('Connection error: check network','#f85149');
  };
}

function onWsMsg(m){
  switch(m.type){
    case 'welcome':
      myId=m.participant.id; myColor=m.participant.color; myName=m.participant.name;
      renderParticipants(m.room_state.participants||[]);
      setParticipantCount(m.room_state.participants?m.room_state.participants.length:1);
      /* HOST badge in mp-panel */
      {
        const existingBadge=$('#mp-panel .host-badge');if(existingBadge)existingBadge.remove();
        if(m.is_host||amHost){
          const hb=document.createElement('span');hb.className='host-badge';hb.textContent='HOST';
          const codeEl=$('#mp-code');if(codeEl&&codeEl.parentElement)codeEl.parentElement.appendChild(hb);
        }
      }
      break;
    case 'participant_join':
      addPToList(m.participant); incrPCount(1);
      showToast(m.participant.name+' joined', m.participant.color);
      break;
    case 'participant_leave':
      $('#pid-'+m.participant_id)&&$('#pid-'+m.participant_id).remove(); incrPCount(-1);
      break;
    case 'participant_update':
      {const el=$('#pid-'+m.participant.id);if(el)el.querySelector('.p-name').textContent=m.participant.name;}
      break;
    case 'token':
      /* Guests receive token events broadcast by host */
      if(!amHost){
        allTokens.push(m); graphNodes.push(m);
        const sp=mkSpan(m.text,m.transformed,m.importance,'',m.chaos_label,m.confidence,m.perplexity);
        sp.dataset.idx=m.index; $('#v-single').appendChild(sp);
        updatePerpSparkline(m.perplexity);
      }
      break;
    case 'surgery':
      applyPeerSurgery(m); break;
    case 'chat':
      renderChatMsg(m); break;
    case 'vote_update':
      if(m.transform===$('#transform').value){$('#vote-up-n').textContent=m.up;$('#vote-dn-n').textContent=m.down;}
      $('#vote-label').textContent=m.transform+': +'+m.up+'/-'+m.down;
      break;
    case 'record_started':
      isRecording=true;$('#btn-rec').textContent='⏹ Stop';$('#btn-rec').classList.add('btn-rec-on'); break;
    case 'record_stopped':
      isRecording=false;$('#btn-rec').textContent='⏺ Record';$('#btn-rec').classList.remove('btn-rec-on');
      hasReplay=true;$('#btn-replay').style.display=''; break;
    case 'replay_event':
      doReplayEvent(m.event,m.offset_ms); break;
    case 'replay_done':
      $('#replay-prog').classList.remove('show'); break;
    case 'stream_done':
      /* Host's stream finished: re-enable stream button for guests */
      $('#start').disabled=false;$('#start').textContent='Stream';
      if(!amHost){enableSurgery($('#v-single'));renderResearch();}
      break;
    case 'error':
      showNotice('Room error: '+m.message, 'error'); break;
  }
}

/* Participants */
function renderParticipants(list){$('#participant-list').innerHTML='';list.forEach(addPToList);}
function addPToList(p){
  if($('#pid-'+p.id))return;
  peerColors[p.id]=p.color;
  const d=document.createElement('div');d.className='p-item';d.id='pid-'+p.id;
  const av=document.createElement('div');av.className='p-avatar';av.style.background=safeCssColor(p.color);
  av.textContent=(p.name||'?')[0].toUpperCase();
  const nm=document.createElement('span');nm.className='p-name';nm.textContent=p.name;
  d.appendChild(av);d.appendChild(nm);
  if(p.is_host){const h=document.createElement('span');h.className='p-host';h.textContent='HOST';d.appendChild(h);nm.textContent='★ '+nm.textContent;}
  $('#participant-list').appendChild(d);
}
function setParticipantCount(n){$('#mp-count-badge').textContent=n;}
function incrPCount(d){$('#mp-count-badge').textContent=Math.max(1,parseInt($('#mp-count-badge').textContent||'1')+d);}
function showToast(text,color){
  const t=document.createElement('div');t.className='join-toast';t.style.borderColor=color||'#25271f';t.textContent=text;
  $('#participant-list').prepend(t);setTimeout(()=>t.remove(),3000);
}

/* Peer surgery */
function applyPeerSurgery(edit){
  if(allTokens[edit.token_index])allTokens[edit.token_index].text=edit.new_text;
  [$('#v-single'),$('#sbs-xform')].forEach(c=>{
    if(!c)return;
    const spans=c.querySelectorAll('.token');
    if(spans[edit.token_index]){
      const sp=spans[edit.token_index];sp.textContent=edit.new_text;
      sp.style.color=edit.editor_color;sp.classList.add('peer-edited');
      setTimeout(()=>{sp.style.color='';sp.classList.remove('peer-edited');},900);
    }
  });
}

/* Chat */
function renderChatMsg(m){
  const d=document.createElement('div');d.className='chat-msg';
  /* MAX chat history: 200 messages */
  const msgs=$('#chat-msgs');
  if(msgs.children.length>=200)msgs.removeChild(msgs.firstChild);
  const author=document.createElement('span');author.className='chat-author';
  author.style.color=safeCssColor(m.author_color);author.textContent=m.author_name;
  const sep=document.createTextNode(' ');
  const body=document.createElement('span');body.className='chat-text';body.textContent=m.text;
  const ts=new Date().toLocaleTimeString([],{hour:'2-digit',minute:'2-digit'});
  const tsSpan=document.createElement('span');
  tsSpan.title=new Date().toISOString();
  tsSpan.style.cssText='font-size:.6rem;color:#5f5b50;cursor:help;margin-left:4px';
  tsSpan.textContent=ts;
  d.appendChild(author);d.appendChild(sep);d.appendChild(body);d.appendChild(tsSpan);
  if(m.token_index!=null){
    const ref=document.createElement('div');ref.className='chat-ref';ref.textContent='re: token #'+m.token_index;
    d.appendChild(ref);
  }
  msgs.appendChild(d);msgs.scrollTop=msgs.scrollHeight;
}
function sendChat(){
  const t=$('#chat-in').value.trim();if(!t||!roomCode)return;
  sendWs({type:'chat',text:t,token_index:null});$('#chat-in').value='';
}
$('#chat-btn').onclick=sendChat;
$('#chat-in').addEventListener('keydown',e=>{if(e.key==='Enter')sendChat();});

/* Replay */
function doReplayEvent(ev,offsetMs){
  if(!ev)return;
  if(ev.type==='token'||ev.index!=null){
    allTokens.push(ev);
    const sp=mkSpan(ev.text,ev.transformed,ev.importance,'',ev.chaos_label,ev.confidence,ev.perplexity);
    sp.dataset.idx=ev.index;$('#v-single').appendChild(sp);
  } else if(ev.type==='surgery'){applyPeerSurgery(ev);}
  else if(ev.type==='chat'){renderChatMsg(ev);}
}

/* Host session */
$('#btn-host').onclick=async()=>{
  const btn=$('#btn-host');
  btn.disabled=true;btn.textContent='Creating...';
  try{
    const r=await fetch('/room/create',{method:'POST'});
    if(!r.ok)throw new Error('Server error '+r.status);
    const d=await r.json();
    amHost=true; myName='Host';
    initRoom(d.code,true);
  }catch(e){
    showNotice('Could not create room: '+e.message, 'error');
  }finally{
    btn.disabled=false;btn.textContent='Host Session';
  }
};

/* Join session */
$('#btn-join').onclick=()=>{
  const c=$('#join-code').value.trim().toUpperCase().replace(/[^A-Z0-9]/g,'');
  if(c.length!==6){showNotice('Room code must be 6 characters.', 'warning'); return;}
  myName='Guest'; initRoom(c,false);
};

/* Auto-join from /join/XXXXXX URL */
(function(){
  const m=location.pathname.match(/\/join\/([A-Z0-9]{6})/i);
  if(m){const code=m[1].toUpperCase();myName='Guest';setTimeout(()=>initRoom(code,false),100);}
})();

/* Copy link */
$('#btn-copy-link').onclick=()=>{
  if(!roomCode)return;
  const url=location.origin+'/join/'+roomCode;
  navigator.clipboard.writeText(url).then(()=>{
    $('#btn-copy-link').textContent='Copied!';setTimeout(()=>$('#btn-copy-link').textContent='Copy Link',1500);
  }).catch(()=>{$('#btn-copy-link').textContent=roomCode;});
};
$('#mp-code').onclick=()=>$('#btn-copy-link').click();

/* Leave */
$('#btn-leave').onclick=()=>{if(ws)ws.close();leaveRoom(true);};
function leaveRoom(explicit){
  ws=null;roomCode=null;amHost=false;isRecording=false;hasReplay=false;
  $('#mp-panel').classList.remove('show');
  $('#sidebar').classList.remove('show');
  $('#chat-panel').classList.remove('show');
  $('#vote-bar').classList.remove('show');
  document.body.style.paddingRight='';
  $('#participant-list').innerHTML='';
}

/* Vote */
$('#btn-vote-up').onclick=()=>sendWs({type:'vote',transform:$('#transform').value,dir:'up'});
$('#btn-vote-dn').onclick=()=>sendWs({type:'vote',transform:$('#transform').value,dir:'down'});

/* Record */
$('#btn-rec').onclick=()=>{
  if(!roomCode)return;
  sendWs(isRecording?{type:'record_stop'}:{type:'record_start'});
};

/* Replay */
$('#btn-replay').onclick=()=>{
  if(!roomCode)return;
  $('#v-single').innerHTML='';allTokens=[];graphNodes=[];
  $('#replay-prog').classList.add('show');$('#replay-bar').style.width='0%';
  sendWs({type:'replay_request'});
};

/* Hook: when host streams tokens over SSE, also broadcast them to room via WS */
const _baseStartClick=$('#start').onclick;
$('#start').onclick=function(){
  _baseStartClick&&_baseStartClick.call(this);
  if(!roomCode||!amHost)return;
  /* Wrap es.onmessage after EventSource is created (slight delay) */
  setTimeout(()=>{
    if(!es)return;
    const orig=es.onmessage;
    es.onmessage=function(ev){
      orig&&orig.call(this,ev);
      if(ev.data==='[DONE]'){sendWs({type:'stream_done'});return;}
      try{
        const tk=JSON.parse(ev.data);
        sendWs({type:'token',...tk});
        if(isRecording)sendWs({type:'_record_token',...tk}); // server handles via maybe_record
      }catch(_){}
    };
  },30);
};

/* Surgery WS broadcast is handled directly in the enableSurgery commit
   function above (sendWs call on line with {type:'surgery',...}). No
   MutationObserver needed. */
document.getElementById('shortcuts-close').onclick = () =>
  document.getElementById('shortcuts-modal').classList.remove('show');
document.getElementById('shortcuts-modal').onclick = e => {
  if(e.target === document.getElementById('shortcuts-modal'))
    document.getElementById('shortcuts-modal').classList.remove('show');
};
/* ================================================================
   ITEM 1: SSE event batching: 100ms flush loop
   ================================================================ */
let _sseQueue = [];
let _sseFlushRunning = false;
function _startSseFlush(countRef, xformedRef, modeRef) {
  if (_sseFlushRunning) return;
  _sseFlushRunning = true;
  function flush() {
    if (!_sseFlushRunning) return;
    const MAX_DOM_TOKENS = 500;
    const batch = _sseQueue.splice(0, 30);
    if (batch.length > 0) {
      const vsingle = $('#v-single');
      batch.forEach(tk => {
        const domToks = vsingle.querySelectorAll('.token');
        if (domToks.length >= MAX_DOM_TOKENS) domToks[0].remove();
        countRef.count++; if (tk.transformed) xformedRef.xformed++;

        const singleSp = mkSpan(tk.text, tk.transformed, tk.importance, '', tk.chaos_label, tk.confidence, tk.perplexity);
        singleSp.dataset.idx = tk.index;
        appendTok(vsingle, singleSp);
        updatePerpSparkline(tk.perplexity);
        updateConfSparkline(tk.confidence);

        const origSp = mkSpan(tk.original, false, tk.importance, null, null, tk.confidence, tk.perplexity); origSp.dataset.idx = tk.index;
        appendTok($('#sbs-orig'), origSp);
        const xformSp = mkSpan(tk.text, tk.transformed, tk.importance, '', tk.chaos_label, tk.confidence, tk.perplexity); xformSp.dataset.idx = tk.index;
        appendTok($('#sbs-xform'), xformSp);

        ['reverse','uppercase','mock','noise','chaos'].forEach(txName => {
          const panel = $('#mp-' + txName);
          if (!panel) return;
          appendTok(panel, mkSpan(tk.transformed ? TX[txName](tk.original) : tk.original, tk.transformed, tk.importance));
        });

        graphNodes.push(tk);
      });

      /* Scroll debounced */
      if (!scrollPending) {
        scrollPending = true;
        requestAnimationFrame(() => {
          scrollPending = false;
          const active = views[mode];
          if (active) active.scrollTop = active.scrollHeight;
          if (mode === 'multi') ['reverse','uppercase','mock','noise'].forEach(tn => { const pp = $('#mp-' + tn); if (pp) pp.scrollTop = pp.scrollHeight; });
        });
      }
      if ($('#graphtoggle').checked && !window._graphRafPending) {
        window._graphRafPending = true;
        requestAnimationFrame(() => { window._graphRafPending = false; drawGraph(); });
      }

      /* ITEM 4: stats with elapsed and tok/s */
      const elapsedMs = Date.now() - (_streamStart || Date.now());
      const elapsedSec = Math.max(elapsedMs / 1000, 0.01);
      const tokSec = (countRef.count / elapsedSec).toFixed(1);
      const elapsedStr = (elapsedSec).toFixed(1);
      $('#stats').textContent = 'Tokens: ' + countRef.count + ' | Transformed: ' + xformedRef.xformed + ' | Mode: ' + modeRef.mode + ' | ' + elapsedStr + 's | ' + tokSec + ' tok/s';
    }
    if (_sseOnDrained && _sseQueue.length === 0) {
      const done = _sseOnDrained;
      _sseOnDrained = null;
      _sseFlushRunning = false;
      done();
      return;
    }
    setTimeout(flush, 100);
  }
  setTimeout(flush, 100);
}
let _sseOnDrained = null;
function _stopSseFlush() { _sseFlushRunning = false; _sseOnDrained = null; }
/* Stop the flush loop once the queue is empty, then call onDone. */
function _finishSseFlush(onDone) {
  if (!_sseFlushRunning) { onDone(); return; }
  _sseOnDrained = onDone;
}

/* ITEM 4: stream start timestamp */
let _streamStart = null;

/* ================================================================
   ITEM 2: Transform live preview
   ================================================================ */
(function(){
  const SAMPLE = 'The quick brown fox jumps';
  function updatePreview() {
    const sel = $('#transform');
    const chainMode = typeof chainTransforms !== 'undefined' && chainTransforms.length > 0;
    const txName = sel ? sel.value : 'reverse';
    let transformed;
    if (chainMode) {
      transformed = chainTransforms.reduce((s, tx) => TX[tx] ? TX[tx](s) : s, SAMPLE);
    } else {
      transformed = TX[txName] ? TX[txName](SAMPLE) : SAMPLE;
    }
    const prev = $('#transform-preview');
    if (!prev) return;
    prev.classList.add('show');
    prev.innerHTML = '<span style="color:#5f5b50">Preview: </span><span style="color:#96917f">' + escHtml(SAMPLE) + '</span><span style="color:#5f5b50"> → </span><span style="color:#e3b341">' + escHtml(transformed) + '</span>';
  }
  const txSel = $('#transform');
  if (txSel) txSel.addEventListener('input', updatePreview);
  window._updateTransformPreview = updatePreview;
  setTimeout(updatePreview, 0);
})();

/* ================================================================
   ITEM 3: Min-confidence slider
   ================================================================ */
$('#min-confidence').oninput = function() { $('#conf-label').textContent = this.value + '%'; };

/* ================================================================
   ITEM 6: Transform chain builder
   ================================================================ */
let chainTransforms = [];
let _chainModeActive = false;
$('#btn-chain-mode').onclick = function() {
  _chainModeActive = !_chainModeActive;
  const panel = $('#chain-builder');
  if (panel) { if (_chainModeActive) panel.classList.add('show'); else panel.classList.remove('show'); }
  this.classList.toggle('active', _chainModeActive);
  /* Re-run validation; if chain mode off, re-enable start btn */
  if (!_chainModeActive) {
    const errEl=document.getElementById('chain-error');if(errEl){errEl.textContent='';errEl.style.display='none';}
    const prevEl=document.getElementById('chain-preview');if(prevEl)prevEl.textContent='';
    $('#start').disabled=false;
  }
};
(function(){
  const builder = $('#chain-builder');
  if (!builder) return;
  /* Inject validation elements into chain-builder */
  {
    const errSpan=document.createElement('span');errSpan.id='chain-error';errSpan.style.cssText='color:#f85149;font-size:.7rem;display:none';builder.appendChild(errSpan);
    const previewSpan=document.createElement('span');previewSpan.id='chain-preview';previewSpan.style.cssText='color:#3fb950;font-size:.75rem;font-family:monospace;display:block;margin-top:2px';builder.appendChild(previewSpan);
  }
  function updateChain() {
    const checks = builder.querySelectorAll('input[data-tx]');
    chainTransforms = [];
    checks.forEach(cb => { if (cb.checked) chainTransforms.push(cb.dataset.tx); });
    const cur = $('#chain-current');
    if (cur) cur.textContent = chainTransforms.length ? chainTransforms.join(',') : 'none';
    /* Validation feedback */
    const errEl=document.getElementById('chain-error');
    const prevEl=document.getElementById('chain-preview');
    const startBtn=$('#start');
    if(errEl){
      if(chainTransforms.length===0&&_chainModeActive){
        errEl.textContent='Select at least one transform';errEl.style.display='';
        if(prevEl)prevEl.textContent='';
        if(startBtn&&_chainModeActive)startBtn.disabled=true;
      } else {
        /* Check for duplicates */
        const seen={};const dups=[];
        chainTransforms.forEach(tx=>{seen[tx]=(seen[tx]||0)+1;if(seen[tx]===2)dups.push(tx);});
        if(dups.length>0){errEl.textContent='⚠ Duplicate: '+dups.join(', ');errEl.style.display='';}
        else{errEl.textContent='';errEl.style.display='none';}
        if(prevEl)prevEl.textContent=chainTransforms.length?'Chain: '+chainTransforms.join(' → '):'';
        if(startBtn)startBtn.disabled=false;
      }
    }
    if (window._updateTransformPreview) window._updateTransformPreview();
  }
  builder.querySelectorAll('input[data-tx]').forEach(cb => cb.addEventListener('change', updateChain));
})();

/* ================================================================
   ITEM 7: Replay speed slider
   ================================================================ */
$('#replay-speed').oninput = function() {
  $('#speed-label').textContent = this.value + '×';
};
function getReplaySpeedMultiplier() {
  const s = $('#replay-speed');
  return s ? Math.max(1, parseInt(s.value)) : 3;
}

/* Wrap doReplayEvent to use speed when called with a delay */
(function(){
  const _origDoReplayEvent = doReplayEvent;
  window.doReplayEvent = function(ev, offsetMs) {
    const speed = getReplaySpeedMultiplier();
    const delay = Math.max(0, (offsetMs || 0) / speed);
    setTimeout(() => _origDoReplayEvent(ev, 0), delay);
  };
})();

/* ================================================================
   ITEM 8: Single-step undo button
   ================================================================ */
function undoOne() {
  const last = undoStack.pop();
  if (!last) return;
  last.sp.textContent = last.oldText;
  if (last.idx >= 0 && allTokens[last.idx]) allTokens[last.idx].text = last.oldText;
  if (typeof ws !== 'undefined' && ws && ws.readyState === WebSocket.OPEN) {
    try { ws.send(JSON.stringify({type:'surgery', token_index: last.idx, old_text: last.newText, new_text: last.oldText})); } catch(e) { console.warn('[eot] ws undo send failed:', e); }
  }
  updateUndoBtnState();
}
function updateUndoBtnState() {
  const btn = $('#btn-undo-one');
  if (btn) btn.disabled = undoStack.length === 0;
}
$('#btn-undo-one').onclick = undoOne;

/* Patch undoStack push to keep btn state in sync */
(function(){
  const _origPush = Array.prototype.push;
  const _origPop = Array.prototype.pop;
  /* We can't patch array prototype globally; instead hook surgery commit via MutationObserver -
     Instead, update btn state on each undo and on stream start/clear */
})();

/* ================================================================
   ITEM 9: A/B analytics enhancements: bar chart hook
   ================================================================ */
function _renderExpDivergenceExtra(tokA, tokB, minLen, matches) {
  const el = $('#exp-diverge');
  if (minLen === 0) { const cw=$('#ab-chart-wrap');if(cw)cw.style.display='none'; return; }

  /* Summary line: appended to diverge panel */
  const agreements = [];
  for (let i = 0; i < minLen; i++) {
    agreements.push(tokA[i].original === tokB[i].original);
  }
  const pct = Math.round(matches / minLen * 100);
  const summaryDiv = document.createElement('div');
  summaryDiv.style.cssText = 'font-size:.72rem;color:#96917f;margin-bottom:4px;margin-top:4px';
  summaryDiv.innerHTML = '<strong style="color:#e6e1d3">Agreement: ' + pct + '%</strong> &nbsp;|&nbsp; Matching: <span style="color:#3fb950">' + matches + '</span> &nbsp;|&nbsp; Diverging: <span style="color:#f85149">' + (minLen - matches) + '</span>';
  if (el) el.appendChild(summaryDiv);

  /* Bar chart */
  const chartWrap = $('#ab-chart-wrap');
  if (!chartWrap) return;
  chartWrap.style.display = '';
  const canvas = $('#ab-chart');
  if (!canvas) return;
  const positions = Math.min(50, agreements.length);
  const dpr = window.devicePixelRatio || 1;
  const w = canvas.parentElement.clientWidth || 600;
  canvas.width = w * dpr;
  canvas.height = 80 * dpr;
  canvas.style.width = w + 'px';
  canvas.style.height = '80px';
  const ctx = canvas.getContext('2d');
  ctx.scale(dpr, dpr);
  ctx.clearRect(0, 0, w, 80);
  const barW = Math.max(1, (w - 40) / positions);
  const chartH = 55;
  const xOff = 30;
  /* Axes */
  ctx.strokeStyle = '#36382f'; ctx.lineWidth = 1;
  ctx.beginPath(); ctx.moveTo(xOff, 5); ctx.lineTo(xOff, chartH + 5); ctx.lineTo(w - 5, chartH + 5); ctx.stroke();
  /* Title */
  ctx.fillStyle = '#96917f'; ctx.font = '10px monospace'; ctx.textAlign = 'center';
  ctx.fillText('Token Agreement', w / 2, 12);
  /* X-axis label */
  ctx.fillStyle = '#5f5b50'; ctx.font = '9px monospace';
  ctx.fillText('Token position', w / 2, 76);
  /* Bars */
  for (let i = 0; i < positions; i++) {
    ctx.fillStyle = agreements[i] ? '#3fb950' : '#f85149';
    const x = xOff + i * barW + 1;
    ctx.fillRect(x, 10, Math.max(1, barW - 2), chartH - 5);
  }
  /* X-axis tick labels */
  ctx.fillStyle = '#5f5b50'; ctx.font = '8px monospace'; ctx.textAlign = 'center';
  [0, Math.floor(positions / 2), positions - 1].forEach(i => {
    if (i < positions) ctx.fillText(i + 1, xOff + i * barW + barW / 2, chartH + 14);
  });
};

document.getElementById('btn-export-research').onclick = () => {
  if (!allTokens.length) { showNotice('No tokens yet. Run a stream first.', 'warning'); return; }
  const withConf = allTokens.filter(t => t.confidence != null);
  const withPerp = allTokens.filter(t => t.perplexity != null);
  const avgConf = withConf.length ? (withConf.reduce((s,t)=>s+t.confidence,0)/withConf.length*100).toFixed(1)+'%' : 'n/a';
  const avgPerp = withPerp.length ? (withPerp.reduce((s,t)=>s+t.perplexity,0)/withPerp.length).toFixed(3) : 'n/a';
  const unique = new Set(allTokens.map(t=>t.original.toLowerCase())).size;
  const diversity = (unique/allTokens.length).toFixed(3);
  const ts = new Date().toISOString();
  const md = [
    '# Every-Other-Token Research Export',
    '',
    `**Exported:** ${ts}`,
    `**Prompt:** ${document.getElementById('prompt').value}`,
    `**Provider:** ${document.getElementById('provider').value}`,
    `**Model:** ${document.getElementById('model').value || 'auto'}`,
    `**Transform:** ${document.getElementById('transform').value}`,
    '',
    '## Aggregate Stats',
    '',
    `| Metric | Value |`,
    `|--------|-------|`,
    `| Token count | ${allTokens.length} |`,
    `| Transformed | ${allTokens.filter(t=>t.transformed).length} |`,
    `| Vocab diversity | ${diversity} |`,
    `| Avg confidence | ${avgConf} |`,
    `| Avg perplexity | ${avgPerp} |`,
    '',
    '## Top 10 High-Perplexity Tokens',
    '',
    ...withPerp.sort((a,b)=>b.perplexity-a.perplexity).slice(0,10).map((t,i)=>
      `${i+1}. \`${t.original}\`: perplexity ${t.perplexity.toFixed(2)}`
    ),
    '',
    '## Surgery Log',
    '',
    surgeryLog.length ? surgeryLog.map(e=>`- token #${e.index}: \`${e.original}\` → \`${e.replacement}\``).join('\n') : '_(no edits)_',
  ].join('\n');
  const blob = new Blob([md], {type:'text/markdown'});
  const url = URL.createObjectURL(blob);
  const a = document.createElement('a');
  a.href = url; a.download = 'eot-research-' + Date.now() + '.md';
  document.body.appendChild(a); a.click(); a.remove();
  URL.revokeObjectURL(url);
};</script>
</body>
</html>