Add Document Discrepancy Finder tool

8-step NDJSON-streaming pipeline that compares two Barnevernet documents:
classifies each doc, extracts parties and timelines, cross-references both
for contradictions/deletions/additions, retrieves corpus legal context, and
synthesises a full discrepancy report with tabbed UI.

New files: DiscrepancyAgent.php, api/discrepancy.php, discrepancy.php,
discrepancy.js. Modified: FreeTier.php (cost=4), i18n.php (all 4 langs),
tool-svgs.php (DC icon), tools.css (dc-* component styles).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/discrepancy.php

@@ -0,0 +1,161 @@
+<?php
+declare(strict_types=1);
+
+require_once __DIR__ . '/../includes/bootstrap.php';
+require_once __DIR__ . '/../includes/DiscrepancyAgent.php';
+
+dbnToolsRequireMethod('POST');
+dbnToolsRequireAuth();
+$ftUid       = dbnToolsFreeTierCheck('discrepancy');
+$ftRemaining = dbnToolsFreeTierDeduct($ftUid, 'discrepancy');
+
+@ini_set('output_buffering', '0');
+@ini_set('zlib.output_compression', '0');
+@ini_set('implicit_flush', '1');
+while (ob_get_level() > 0) { @ob_end_clean(); }
+ob_implicit_flush(true);
+
+header('Content-Type: application/x-ndjson; charset=utf-8');
+header('Cache-Control: no-store');
+header('X-Accel-Buffering: no');
+if ($ftRemaining >= 0) { header('X-Credits-Remaining: ' . $ftRemaining); }
+
+$language  = 'en';
+$startTime = microtime(true);
+
+$emit = function (string $event, array $payload = []) use ($startTime): void {
+    $payload['event'] = $event;
+    $payload['t_ms']  = (int)round((microtime(true) - $startTime) * 1000);
+    echo json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) . "\n";
+    @flush();
+};
+
+try {
+    // Parse payload (always multipart — two files required)
+    $payloadRaw = (string)($_POST['payload'] ?? '');
+    if ($payloadRaw === '') {
+        throw new DbnToolsHttpException('Missing payload field.', 422, 'missing_payload');
+    }
+    $input = json_decode($payloadRaw, true);
+    if (!is_array($input)) {
+        throw new DbnToolsHttpException('Invalid payload JSON.', 422, 'invalid_payload_json');
+    }
+
+    $language      = dbnToolsNormalizeLanguage($input['language'] ?? 'en');
+    $engine        = (string)($input['engine'] ?? 'azure_mini');
+    $sliceInput    = $input['slices'] ?? [];
+
+    // Extract file A
+    $emit('progress', ['detail' => 'Reading Document A…']);
+    $fileEntryA = $_FILES['file_a'] ?? null;
+    if (!$fileEntryA || ($fileEntryA['error'] ?? UPLOAD_ERR_NO_FILE) !== UPLOAD_ERR_OK) {
+        throw new DbnToolsHttpException(
+            'Document A is required. Upload a PDF, DOCX, or TXT file.',
+            422, 'missing_file_a'
+        );
+    }
+    $extractedA = dbnToolsExtractUploadedFile([
+        'name'     => $fileEntryA['name']     ?? '',
+        'type'     => $fileEntryA['type']     ?? '',
+        'tmp_name' => $fileEntryA['tmp_name'] ?? '',
+        'error'    => $fileEntryA['error']    ?? UPLOAD_ERR_NO_FILE,
+        'size'     => $fileEntryA['size']     ?? 0,
+    ]);
+    $fileA = [
+        'filename'  => $extractedA['filename'],
+        'text'      => $extractedA['text'],
+        'chars'     => $extractedA['chars'],
+        'truncated' => $extractedA['truncated'],
+    ];
+    $emit('progress', ['detail' => sprintf('Document A extracted: %s (%d chars%s)',
+        $extractedA['filename'], $extractedA['chars'],
+        !empty($extractedA['truncated']) ? ', truncated' : '')]);
+
+    // Extract file B
+    $emit('progress', ['detail' => 'Reading Document B…']);
+    $fileEntryB = $_FILES['file_b'] ?? null;
+    if (!$fileEntryB || ($fileEntryB['error'] ?? UPLOAD_ERR_NO_FILE) !== UPLOAD_ERR_OK) {
+        throw new DbnToolsHttpException(
+            'Document B is required. Upload a PDF, DOCX, or TXT file.',
+            422, 'missing_file_b'
+        );
+    }
+    $extractedB = dbnToolsExtractUploadedFile([
+        'name'     => $fileEntryB['name']     ?? '',
+        'type'     => $fileEntryB['type']     ?? '',
+        'tmp_name' => $fileEntryB['tmp_name'] ?? '',
+        'error'    => $fileEntryB['error']    ?? UPLOAD_ERR_NO_FILE,
+        'size'     => $fileEntryB['size']     ?? 0,
+    ]);
+    $fileB = [
+        'filename'  => $extractedB['filename'],
+        'text'      => $extractedB['text'],
+        'chars'     => $extractedB['chars'],
+        'truncated' => $extractedB['truncated'],
+    ];
+    $emit('progress', ['detail' => sprintf('Document B extracted: %s (%d chars%s)',
+        $extractedB['filename'], $extractedB['chars'],
+        !empty($extractedB['truncated']) ? ', truncated' : '')]);
+
+    if (($fileA['text'] ?? '') === '') {
+        throw new DbnToolsHttpException('Could not extract text from Document A.', 422, 'empty_file_a');
+    }
+    if (($fileB['text'] ?? '') === '') {
+        throw new DbnToolsHttpException('Could not extract text from Document B.', 422, 'empty_file_b');
+    }
+
+    $emit('start', [
+        'engine'   => $engine,
+        'language' => $language,
+        'file_a'   => $fileA['filename'],
+        'file_b'   => $fileB['filename'],
+    ]);
+
+    $result = (new DbnDiscrepancyAgent())->run(
+        $fileA,
+        $fileB,
+        $engine,
+        $language,
+        is_array($sliceInput) ? $sliceInput : [],
+        $emit
+    );
+
+    $result['ok']         = true;
+    $result['latency_ms'] = (int)round((microtime(true) - $startTime) * 1000);
+
+    dbnToolsLogMetadata([
+        'tool'           => 'discrepancy',
+        'language'       => $language,
+        'ok'             => true,
+        'latency_ms'     => $result['latency_ms'],
+        'source_count'   => (int)($result['trace_metadata']['source_count'] ?? 0),
+        'conflict_count' => (int)($result['trace_metadata']['conflict_count'] ?? 0),
+        'deleted_count'  => (int)($result['trace_metadata']['deleted_count'] ?? 0),
+        'added_count'    => (int)($result['trace_metadata']['added_count'] ?? 0),
+        'deployment'     => $result['trace_metadata']['deployment'] ?? null,
+    ]);
+
+    $emit('final', ['result' => $result]);
+
+} catch (DbnToolsHttpException $e) {
+    $latency = (int)round((microtime(true) - $startTime) * 1000);
+    dbnToolsLogMetadata([
+        'tool'       => 'discrepancy',
+        'language'   => $language,
+        'ok'         => false,
+        'latency_ms' => $latency,
+        'error_code' => $e->errorCode,
+    ]);
+    $emit('error', ['code' => $e->errorCode, 'message' => $e->getMessage(), 'status' => $e->status]);
+} catch (Throwable $e) {
+    error_log('DBN discrepancy fatal: ' . $e->getMessage());
+    $latency = (int)round((microtime(true) - $startTime) * 1000);
+    dbnToolsLogMetadata([
+        'tool'       => 'discrepancy',
+        'language'   => $language,
+        'ok'         => false,
+        'latency_ms' => $latency,
+        'error_code' => 'internal_error',
+    ]);
+    $emit('error', ['code' => 'internal_error', 'message' => 'The discrepancy finder could not complete this request.']);
+}

assets/css/tools.css

@@ -6376,6 +6376,534 @@ body.lt-landing {
   }
 }
 
+/* ─── Discrepancy Finder (dc-*) ──────────────────────────────────────────── */
+
+/* Two upload zones side by side */
+.dc-upload-pair {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 16px;
+  margin-bottom: 16px;
+}
+
+.dc-upload-slot {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+}
+
+.dc-slot-hint {
+  font-weight: 400;
+  color: var(--muted);
+  font-size: 0.86em;
+}
+
+.dc-zone input[type="file"] {
+  position: absolute;
+  width: 0;
+  height: 0;
+  opacity: 0;
+  pointer-events: none;
+}
+
+/* Progressive doc meta cards */
+.dc-doc-meta-pair {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 12px;
+  margin-bottom: 16px;
+}
+
+.dc-doc-meta-card {
+  background: var(--panel);
+  border: 1px solid var(--line);
+  border-radius: 10px;
+  padding: 14px 16px;
+}
+
+.dc-doc-meta-card__head {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  margin-bottom: 10px;
+}
+
+.dc-slot-label {
+  font-size: 0.72rem;
+  font-weight: 800;
+  letter-spacing: 0.05em;
+  text-transform: uppercase;
+  color: var(--muted);
+  background: #f3f4f6;
+  border: 1px solid var(--line);
+  border-radius: 4px;
+  padding: 2px 7px;
+}
+
+.dc-slot-label--a { background: #e8f0fe; color: #2d5fa6; border-color: #c3d4f8; }
+.dc-slot-label--b { background: var(--soft-coral); color: var(--coral); border-color: #f9c6ae; }
+
+/* Parties preview (stream-time) */
+.dc-parties-preview {
+  margin-bottom: 10px;
+}
+
+.dc-parties-chips {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+  margin-top: 6px;
+}
+
+.dc-party-chip {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  font-size: 0.78rem;
+  font-weight: 600;
+  background: var(--soft-teal);
+  color: var(--teal-dark);
+  border: 1px solid #b2dbd6;
+  border-radius: 999px;
+  padding: 3px 10px;
+}
+
+.dc-party-chip--more {
+  background: #f3f4f6;
+  color: var(--muted);
+  border-color: var(--line);
+}
+
+.dc-parties-count {
+  font-size: 0.8rem;
+  color: var(--muted);
+  margin: 4px 0 0;
+}
+
+/* Timeline preview (stream-time) */
+.dc-timeline-preview {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  font-size: 0.82rem;
+  color: var(--muted);
+  margin-bottom: 6px;
+  padding: 6px 10px;
+  background: #f7f8fb;
+  border: 1px solid var(--line);
+  border-radius: 6px;
+}
+
+.dc-timeline-preview strong {
+  color: var(--ink);
+}
+
+/* ── Tabs ─────────────────────────────────────────────────────────────────── */
+
+.dc-tabs {
+  display: grid;
+  gap: 0;
+}
+
+.dc-tab-bar {
+  display: flex;
+  gap: 2px;
+  border-bottom: 2px solid var(--line);
+  margin-bottom: 16px;
+  overflow-x: auto;
+}
+
+.dc-tab {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  padding: 8px 14px;
+  font-size: 0.84rem;
+  font-weight: 600;
+  color: var(--muted);
+  border: none;
+  background: none;
+  cursor: pointer;
+  border-bottom: 2px solid transparent;
+  margin-bottom: -2px;
+  white-space: nowrap;
+  transition: color 100ms ease, border-color 100ms ease;
+}
+
+.dc-tab:hover { color: var(--ink); }
+
+.dc-tab.is-active {
+  color: var(--teal-dark);
+  border-bottom-color: var(--teal);
+}
+
+.dc-tab-count {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  min-width: 18px;
+  height: 18px;
+  padding: 0 5px;
+  border-radius: 999px;
+  font-size: 0.7rem;
+  font-weight: 800;
+  background: var(--line);
+  color: var(--muted);
+}
+
+.dc-tab.is-active .dc-tab-count {
+  background: var(--soft-teal);
+  color: var(--teal-dark);
+}
+
+.dc-tab-panel { display: none; }
+.dc-tab-panel.is-active { display: block; }
+
+/* ── Headline finding ─────────────────────────────────────────────────────── */
+
+.dc-headline {
+  border-left: 4px solid var(--coral);
+  background: var(--soft-coral);
+  border-radius: 0 8px 8px 0;
+  padding: 14px 16px;
+  margin-bottom: 16px;
+}
+
+.dc-headline__label {
+  font-size: 0.72rem;
+  font-weight: 800;
+  letter-spacing: 0.05em;
+  text-transform: uppercase;
+  color: var(--coral);
+  margin-bottom: 6px;
+}
+
+.dc-headline__text {
+  font-size: 1.0rem;
+  font-weight: 700;
+  color: var(--ink);
+  line-height: 1.5;
+  margin: 0;
+}
+
+/* ── Discrepancy list (Summary tab) ──────────────────────────────────────── */
+
+.dc-discrepancies {
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+}
+
+.dc-discrepancy {
+  background: var(--panel);
+  border: 1px solid var(--line);
+  border-radius: 8px;
+  padding: 14px 16px;
+}
+
+.dc-discrepancy--contradiction { border-left: 3px solid var(--coral); }
+.dc-discrepancy--deletion      { border-left: 3px solid var(--amber); }
+.dc-discrepancy--addition      { border-left: 3px solid var(--teal); }
+.dc-discrepancy--date_shift    { border-left: 3px solid #8b5cf6; }
+.dc-discrepancy--changed       { border-left: 3px solid var(--amber); }
+
+.dc-discrepancy__head {
+  display: flex;
+  align-items: flex-start;
+  gap: 10px;
+  margin-bottom: 10px;
+  flex-wrap: wrap;
+}
+
+.dc-cat-tag {
+  display: inline-block;
+  font-size: 0.68rem;
+  font-weight: 800;
+  letter-spacing: 0.05em;
+  text-transform: uppercase;
+  border-radius: 4px;
+  padding: 2px 7px;
+  white-space: nowrap;
+}
+
+.dc-cat-tag--contradiction { background: var(--soft-coral); color: var(--coral); }
+.dc-cat-tag--deletion      { background: #fffbeb; color: var(--amber); }
+.dc-cat-tag--addition      { background: var(--soft-teal); color: var(--teal-dark); }
+.dc-cat-tag--date_shift    { background: #ede9fe; color: #6d28d9; }
+.dc-cat-tag--changed       { background: #fffbeb; color: var(--amber); }
+
+.dc-severity {
+  display: inline-block;
+  font-size: 0.68rem;
+  font-weight: 800;
+  letter-spacing: 0.04em;
+  text-transform: uppercase;
+  border-radius: 999px;
+  padding: 2px 9px;
+  white-space: nowrap;
+}
+
+.dc-sev--high   { background: var(--soft-coral); color: var(--coral); border: 1px solid #f9c6ae; }
+.dc-sev--medium { background: #fffbeb; color: var(--amber); border: 1px solid #fde68a; }
+.dc-sev--low    { background: #f3f4f6; color: var(--muted); border: 1px solid var(--line); }
+
+.dc-discrepancy__compare {
+  display: grid;
+  grid-template-columns: 1fr auto 1fr;
+  gap: 8px;
+  align-items: start;
+  margin-bottom: 10px;
+}
+
+.dc-compare-col {
+  background: #f7f8fb;
+  border: 1px solid var(--line);
+  border-radius: 6px;
+  padding: 10px 12px;
+  font-size: 0.86rem;
+  line-height: 1.55;
+  color: var(--ink);
+}
+
+.dc-compare-col--a {
+  background: #f0f5ff;
+  border-color: #c3d4f8;
+}
+
+.dc-compare-col--b {
+  background: #fff5f0;
+  border-color: #f9c6ae;
+}
+
+.dc-compare-col__label {
+  font-size: 0.68rem;
+  font-weight: 800;
+  letter-spacing: 0.05em;
+  text-transform: uppercase;
+  margin-bottom: 5px;
+}
+
+.dc-compare-col--a .dc-compare-col__label { color: #2d5fa6; }
+.dc-compare-col--b .dc-compare-col__label { color: var(--coral); }
+
+.dc-compare-divider {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 1.2rem;
+  color: var(--muted);
+  padding-top: 28px;
+}
+
+.dc-discrepancy__legal {
+  font-size: 0.82rem;
+  color: var(--muted);
+  font-style: italic;
+  line-height: 1.5;
+  border-top: 1px solid var(--line);
+  padding-top: 8px;
+  margin-top: 4px;
+}
+
+.dc-sig-badge {
+  display: inline-block;
+  font-size: 0.68rem;
+  font-weight: 700;
+  border-radius: 999px;
+  padding: 2px 8px;
+  margin-bottom: 6px;
+}
+
+.dc-sig--high   { background: var(--soft-coral); color: var(--coral); }
+.dc-sig--medium { background: #fffbeb; color: var(--amber); }
+.dc-sig--low    { background: #f3f4f6; color: var(--muted); }
+
+/* ── Parties tab ─────────────────────────────────────────────────────────── */
+
+.dc-party-list {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+}
+
+.dc-party-row {
+  display: grid;
+  grid-template-columns: 1fr 1fr auto;
+  gap: 8px;
+  align-items: center;
+  background: var(--panel);
+  border: 1px solid var(--line);
+  border-radius: 6px;
+  padding: 10px 12px;
+  border-left: 3px solid var(--line);
+}
+
+.dc-party-row--removed { border-left-color: var(--coral); background: #fff5f0; }
+.dc-party-row--added   { border-left-color: var(--teal);  background: #f0faf8; }
+.dc-party-row--changed { border-left-color: var(--amber); background: #fffdf0; }
+
+.dc-party-row__name {
+  font-weight: 700;
+  font-size: 0.88rem;
+  color: var(--ink);
+}
+
+.dc-party-row__role {
+  font-size: 0.82rem;
+  color: var(--muted);
+}
+
+.dc-party-row__sig {
+  font-size: 0.78rem;
+  color: var(--muted);
+  font-style: italic;
+  line-height: 1.4;
+  grid-column: 1 / -1;
+  padding-top: 4px;
+  border-top: 1px solid var(--line);
+  margin-top: 4px;
+}
+
+/* ── Timeline tab ────────────────────────────────────────────────────────── */
+
+.dc-timeline-list {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.dc-tl-item {
+  background: var(--panel);
+  border: 1px solid var(--line);
+  border-radius: 8px;
+  padding: 12px 14px;
+  border-left: 3px solid var(--line);
+}
+
+.dc-tl-item--conflict  { border-left-color: var(--coral); }
+.dc-tl-item--deleted   { border-left-color: var(--amber); }
+.dc-tl-item--added     { border-left-color: var(--teal); }
+.dc-tl-item--date_shift { border-left-color: #8b5cf6; }
+
+.dc-tl-item__head {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  margin-bottom: 8px;
+  flex-wrap: wrap;
+}
+
+.dc-tl-date {
+  font-family: ui-monospace, "Cascadia Code", "Fira Code", monospace;
+  font-size: 0.78rem;
+  font-weight: 700;
+  color: var(--muted);
+  background: #f3f4f6;
+  border: 1px solid var(--line);
+  border-radius: 4px;
+  padding: 2px 7px;
+}
+
+.dc-tl-actor {
+  font-size: 0.78rem;
+  font-weight: 700;
+  color: var(--teal-dark);
+  text-transform: uppercase;
+  letter-spacing: 0.04em;
+}
+
+.dc-tl-desc {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 8px;
+  margin-bottom: 8px;
+}
+
+.dc-tl-legal {
+  font-size: 0.8rem;
+  color: var(--muted);
+  font-style: italic;
+  line-height: 1.4;
+  border-top: 1px solid var(--line);
+  padding-top: 7px;
+}
+
+/* ── Narrative blocks ─────────────────────────────────────────────────────── */
+
+.dc-narrative-block {
+  background: var(--panel);
+  border: 1px solid var(--line);
+  border-radius: 8px;
+  padding: 12px 14px;
+  border-left: 3px solid var(--line);
+  margin-bottom: 8px;
+}
+
+.dc-narrative-block--added   { border-left-color: var(--teal); background: #f0faf8; }
+.dc-narrative-block--removed { border-left-color: var(--coral); background: #fff5f0; }
+
+/* ── Action list ─────────────────────────────────────────────────────────── */
+
+.dc-action-list {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  list-style: none;
+  margin: 0;
+  padding: 0;
+}
+
+.dc-action-list li {
+  display: flex;
+  align-items: flex-start;
+  gap: 8px;
+  font-size: 0.88rem;
+  color: var(--ink);
+  line-height: 1.5;
+  padding: 8px 12px;
+  background: var(--soft-teal);
+  border: 1px solid #b2dbd6;
+  border-radius: 6px;
+}
+
+.dc-action-list li::before {
+  content: '→';
+  color: var(--teal);
+  font-weight: 800;
+  flex: 0 0 auto;
+}
+
+/* ── Disclaimer ──────────────────────────────────────────────────────────── */
+
+.dc-disclaimer {
+  font-size: 0.76rem;
+  color: var(--muted);
+  font-style: italic;
+  line-height: 1.5;
+  padding: 10px 12px;
+  background: #f7f8fb;
+  border: 1px solid var(--line);
+  border-radius: 6px;
+  margin-top: 16px;
+}
+
+/* ── Responsive ──────────────────────────────────────────────────────────── */
+
+@media (max-width: 780px) {
+  .dc-upload-pair { grid-template-columns: 1fr; }
+  .dc-doc-meta-pair { grid-template-columns: 1fr; }
+  .dc-discrepancy__compare { grid-template-columns: 1fr; }
+  .dc-compare-divider { padding-top: 0; }
+  .dc-party-row { grid-template-columns: 1fr 1fr; }
+  .dc-tl-desc { grid-template-columns: 1fr; }
+}
+
+@media (max-width: 520px) {
+  .dc-tab-bar { gap: 0; }
+  .dc-tab { padding: 8px 10px; font-size: 0.78rem; }
+  .dc-party-row { grid-template-columns: 1fr; }
+}
+
 /* Print styles */
 @media print {
   .tool-rail, .reasoning-panel, .topbar, .tool-form,

assets/js/discrepancy.js

@@ -0,0 +1,882 @@
+/* discrepancy.js — page-scoped UI for /discrepancy.php */
+(function () {
+  'use strict';
+
+  const els = {};
+  let lang = window.DBN_TOOLS_LANG || localStorage.getItem('dbn-ui-lang') || 'en';
+  let fileA = null;
+  let fileB = null;
+  let lastResult = null;
+
+  const SLICE_DEFS = [
+    { id: 'child_welfare',    label: 'Child Welfare' },
+    { id: 'echr',             label: 'ECHR' },
+    { id: 'family_core',      label: 'Family Law Core' },
+    { id: 'bufdir_guidance',  label: 'Bufdir Guidance' },
+    { id: 'norwegian_courts', label: 'Norwegian Courts' },
+    { id: 'broader_legal',    label: 'Broader Legal' },
+  ];
+
+  const STEP_LABELS = [
+    'Classify documents',
+    'Extract parties',
+    'Build timelines',
+    'Cross-reference parties',
+    'Cross-reference timelines',
+    'Research questions',
+    'Retrieve legal context',
+    'Synthesize report',
+  ];
+
+  const stepKeyToIndex = {
+    doc_classify:     0,
+    party_extract:    1,
+    timeline_extract: 2,
+    cross_parties:    3,
+    cross_timelines:  4,
+    sub_question_gen: 5,
+    retrieval:        6,
+    synthesis:        7,
+  };
+
+  document.addEventListener('DOMContentLoaded', () => {
+    if (!document.body.dataset.activeTool || document.body.dataset.activeTool !== 'discrepancy') return;
+
+    Object.assign(els, {
+      form:            document.getElementById('dcForm'),
+      status:          document.getElementById('dcStatus'),
+      runButton:       document.getElementById('dcRunButton'),
+      results:         document.getElementById('dcResults'),
+      traceList:       document.getElementById('traceList'),
+      langButtons:     Array.from(document.querySelectorAll('#dcLangSwitcher .lang-btn')),
+      engineRadios:    Array.from(document.querySelectorAll('input[name="dcEngine"]')),
+      slices:          Array.from(document.querySelectorAll('.adv-slice')),
+      // File A
+      zoneA:           document.getElementById('dcZoneA'),
+      inputA:          document.getElementById('dcInputA'),
+      promptA:         document.getElementById('dcPromptA'),
+      fileInfoA:       document.getElementById('dcFileInfoA'),
+      fileNameA:       document.getElementById('dcFileNameA'),
+      clearA:          document.getElementById('dcClearA'),
+      // File B
+      zoneB:           document.getElementById('dcZoneB'),
+      inputB:          document.getElementById('dcInputB'),
+      promptB:         document.getElementById('dcPromptB'),
+      fileInfoB:       document.getElementById('dcFileInfoB'),
+      fileNameB:       document.getElementById('dcFileNameB'),
+      clearB:          document.getElementById('dcClearB'),
+      // Source modal
+      modal:           document.getElementById('dcSourceModal'),
+      modalClose:      document.getElementById('dcSourceModalClose'),
+      modalTitle:      document.getElementById('dcSourceModalTitle'),
+      modalEyebrow:    document.getElementById('dcSourceModalEyebrow'),
+      modalMeta:       document.getElementById('dcSourceModalMeta'),
+      modalText:       document.getElementById('dcSourceModalText'),
+    });
+
+    if (!els.form) return;
+
+    bindLang();
+    bindSlices();
+    bindUploadZone('A');
+    bindUploadZone('B');
+    bindModal();
+    els.form.addEventListener('submit', onSubmit);
+
+    renderTrace(STEP_LABELS.map((label) => ({ label, detail: 'Waiting…', status: 'idle' })));
+  });
+
+  // ── Language ───────────────────────────────────────────────────────────────
+
+  function bindLang() {
+    els.langButtons.forEach((b) => {
+      b.classList.toggle('is-active', b.dataset.lang === lang);
+      b.addEventListener('click', () => {
+        els.langButtons.forEach((x) => x.classList.remove('is-active'));
+        b.classList.add('is-active');
+        lang = b.dataset.lang || 'en';
+        localStorage.setItem('dbn-ui-lang', lang);
+      });
+    });
+  }
+
+  // ── Corpus slice toggles ───────────────────────────────────────────────────
+
+  function bindSlices() {
+    els.slices.forEach((btn) => {
+      btn.addEventListener('click', () => {
+        const isOn = btn.classList.toggle('is-on');
+        btn.setAttribute('aria-pressed', isOn ? 'true' : 'false');
+        const badge = btn.querySelector('.dr-slice__badge');
+        if (badge) badge.textContent = isOn ? 'on' : 'off';
+      });
+    });
+  }
+
+  function getSelectedSlices() {
+    const out = {};
+    SLICE_DEFS.forEach((s) => {
+      const btn = els.slices.find((b) => b.dataset.slice === s.id);
+      out[s.id] = !!(btn && btn.classList.contains('is-on'));
+    });
+    return out;
+  }
+
+  // ── File upload zones ──────────────────────────────────────────────────────
+
+  function bindUploadZone(slot) {
+    const zone    = els['zone' + slot];
+    const input   = els['input' + slot];
+    const prompt  = els['prompt' + slot];
+    const info    = els['fileInfo' + slot];
+    const nameEl  = els['fileName' + slot];
+    const clearEl = els['clear' + slot];
+
+    if (!zone) return;
+
+    const accept = (file) => {
+      if (!file) return;
+      if (file.size > 8 * 1024 * 1024) {
+        setStatus(`${file.name} exceeds the 8 MB limit.`, 'error');
+        return;
+      }
+      const ext = (file.name.split('.').pop() || '').toLowerCase();
+      if (!['pdf', 'docx', 'txt'].includes(ext)) {
+        setStatus(`${file.name} is not a supported file type (PDF, DOCX, TXT).`, 'error');
+        return;
+      }
+      if (slot === 'A') fileA = file;
+      else fileB = file;
+      nameEl.textContent = file.name;
+      prompt.classList.add('is-hidden');
+      info.classList.remove('is-hidden');
+      zone.classList.remove('is-drop');
+      setStatus('', '');
+    };
+
+    input.addEventListener('change', (e) => {
+      if (e.target.files && e.target.files[0]) accept(e.target.files[0]);
+    });
+    zone.addEventListener('dragover', (e) => { e.preventDefault(); zone.classList.add('is-drop'); });
+    zone.addEventListener('dragleave', () => zone.classList.remove('is-drop'));
+    zone.addEventListener('drop', (e) => {
+      e.preventDefault();
+      zone.classList.remove('is-drop');
+      const f = e.dataTransfer?.files?.[0];
+      if (f) accept(f);
+    });
+    clearEl?.addEventListener('click', () => {
+      if (slot === 'A') fileA = null;
+      else fileB = null;
+      input.value = '';
+      info.classList.add('is-hidden');
+      prompt.classList.remove('is-hidden');
+    });
+  }
+
+  // ── Form submission ────────────────────────────────────────────────────────
+
+  async function onSubmit(e) {
+    e.preventDefault();
+
+    if (!fileA) {
+      setStatus('Upload Document A (the earlier/original document) before running.', 'error');
+      return;
+    }
+    if (!fileB) {
+      setStatus('Upload Document B (the later/comparison document) before running.', 'error');
+      return;
+    }
+
+    const engine = (els.engineRadios.find((r) => r.checked) || {}).value || 'azure_mini';
+    const slices = getSelectedSlices();
+
+    const expectedDuration = engine === 'azure_full' ? '2-3 minutes'
+                           : engine === 'gpu'        ? '~90 seconds'
+                           : '60-90 seconds';
+
+    setStatus(`Comparing documents… (${expectedDuration})`, 'busy');
+    els.runButton.disabled = true;
+    els.results.innerHTML = `<div class="empty-state"><h3>Analysing…</h3><p>Classifying both documents, extracting parties and timelines, then cross-referencing for discrepancies. Expect ${expectedDuration}.</p></div>`;
+
+    const stepState = STEP_LABELS.map((label) => ({ label, detail: 'Queued', status: 'idle' }));
+    renderTrace(stepState);
+
+    const payload = { engine, language: lang, slices };
+    const form = new FormData();
+    form.append('payload', JSON.stringify(payload));
+    form.append('file_a', fileA);
+    form.append('file_b', fileB);
+
+    let response;
+    try {
+      response = await fetch('api/discrepancy.php', { method: 'POST', body: form, credentials: 'same-origin' });
+    } catch (err) {
+      setStatus(`Network error: ${err.message || err}`, 'error');
+      els.runButton.disabled = false;
+      return;
+    }
+
+    if (!response.ok || !response.body) {
+      if (response.status === 402 || response.status === 429) {
+        const d = await response.json().catch(() => ({}));
+        if (typeof window.dbnFreeTierError === 'function') window.dbnFreeTierError(response.status, d);
+      } else {
+        setStatus(`Request failed (${response.status}).`, 'error');
+      }
+      els.runButton.disabled = false;
+      return;
+    }
+    const creditsRemaining = response.headers.get('X-Credits-Remaining');
+    if (creditsRemaining !== null && typeof window.dbnUpdateCredits === 'function') {
+      window.dbnUpdateCredits(parseInt(creditsRemaining, 10));
+    }
+
+    const reader  = response.body.getReader();
+    const decoder = new TextDecoder('utf-8');
+    let buffer = '';
+    let finalResult = null;
+    let errorEvent  = null;
+
+    // State for progressive rendering
+    let metaARendered    = false;
+    let metaBRendered    = false;
+    let partiesARendered = false;
+    let partiesBRendered = false;
+    let tlARendered      = false;
+    let tlBRendered      = false;
+
+    function handleStreamEvent(evt) {
+      if (!evt || !evt.event) return;
+
+      if (evt.event === 'progress') {
+        if (evt.detail) setStatus(evt.detail, 'busy');
+        return;
+      }
+      if (evt.event === 'start') {
+        setStatus(`Comparing ${escapeHtml(evt.file_a || 'A')} ↔ ${escapeHtml(evt.file_b || 'B')}…`, 'busy');
+        return;
+      }
+      if (evt.event === 'step') {
+        const idx = stepKeyToIndex[evt.step];
+        if (idx !== undefined) {
+          if (evt.status === 'running' && stepState[idx].status !== 'running') {
+            stepState[idx] = { label: evt.label || stepState[idx].label, detail: evt.detail || 'Running…', status: 'running' };
+          } else if (evt.status !== 'running') {
+            stepState[idx] = { label: evt.label || stepState[idx].label, detail: evt.detail || stepState[idx].detail, status: evt.status || stepState[idx].status };
+          }
+          renderTrace(stepState);
+        }
+        return;
+      }
+      if (evt.event === 'doc_a_meta' && !metaARendered) {
+        renderDocMetaCard('A', evt.result || {});
+        metaARendered = true;
+        return;
+      }
+      if (evt.event === 'doc_b_meta' && !metaBRendered) {
+        renderDocMetaCard('B', evt.result || {});
+        metaBRendered = true;
+        return;
+      }
+      if (evt.event === 'parties_a' && !partiesARendered && Array.isArray(evt.parties)) {
+        renderPartiesPreview('A', evt.parties);
+        partiesARendered = true;
+        return;
+      }
+      if (evt.event === 'parties_b' && !partiesBRendered && Array.isArray(evt.parties)) {
+        renderPartiesPreview('B', evt.parties);
+        partiesBRendered = true;
+        return;
+      }
+      if (evt.event === 'timeline_a' && !tlARendered && Array.isArray(evt.events)) {
+        renderTimelinePreview('A', evt.events);
+        tlARendered = true;
+        return;
+      }
+      if (evt.event === 'timeline_b' && !tlBRendered && Array.isArray(evt.events)) {
+        renderTimelinePreview('B', evt.events);
+        tlBRendered = true;
+        return;
+      }
+      if (evt.event === 'subq') {
+        setStatus(`Retrieving ${evt.index}/${evt.total}: ${String(evt.question || '').slice(0, 80)}…`, 'busy');
+        return;
+      }
+      if (evt.event === 'final') {
+        finalResult = evt.result;
+        return;
+      }
+      if (evt.event === 'error') {
+        errorEvent = evt;
+        return;
+      }
+    }
+
+    while (true) {
+      let chunk;
+      try { chunk = await reader.read(); }
+      catch (err) { setStatus(`Stream error: ${err.message || err}`, 'error'); els.runButton.disabled = false; return; }
+      const { done, value } = chunk;
+      if (value) {
+        buffer += decoder.decode(value, { stream: true });
+        const lines = buffer.split('\n');
+        buffer = lines.pop();
+        for (const line of lines) {
+          const trimmed = line.trim();
+          if (!trimmed) continue;
+          let evt;
+          try { evt = JSON.parse(trimmed); } catch (_) { continue; }
+          handleStreamEvent(evt);
+        }
+      }
+      if (done) break;
+    }
+
+    if (errorEvent) {
+      setStatus(`${errorEvent.code}: ${errorEvent.message}`, 'error');
+      els.runButton.disabled = false;
+      const runningIdx = stepState.findIndex((s) => s.status === 'running');
+      if (runningIdx >= 0) {
+        stepState[runningIdx] = { ...stepState[runningIdx], status: 'error', detail: errorEvent.message };
+        renderTrace(stepState);
+      }
+      return;
+    }
+
+    if (!finalResult) {
+      setStatus('Stream ended without a final result.', 'error');
+      els.runButton.disabled = false;
+      return;
+    }
+
+    lastResult = finalResult;
+    const meta = finalResult.trace_metadata || {};
+    setStatus(
+      `Done · ${meta.conflict_count || 0} contradictions · ${meta.deleted_count || 0} deletions · ${meta.added_count || 0} additions · ${meta.source_count || 0} sources`,
+      'ok'
+    );
+    els.runButton.disabled = false;
+    renderTrace(finalResult.trace || []);
+    renderFinalResults(finalResult);
+  }
+
+  // ── Progressive rendering ──────────────────────────────────────────────────
+
+  function ensureResultsReady() {
+    const emptyState = els.results.querySelector('.empty-state');
+    if (emptyState) emptyState.remove();
+
+    // Ensure the doc-meta pair container exists
+    if (!els.results.querySelector('#dcDocMetaPair')) {
+      const pair = document.createElement('div');
+      pair.id = 'dcDocMetaPair';
+      pair.className = 'dc-doc-meta-pair';
+      els.results.insertBefore(pair, els.results.firstChild);
+    }
+  }
+
+  function renderDocMetaCard(slot, meta) {
+    ensureResultsReady();
+    const pair = els.results.querySelector('#dcDocMetaPair');
+    if (!pair) return;
+
+    const existing = pair.querySelector(`#dcMeta${slot}`);
+    if (existing) existing.remove();
+
+    const card = document.createElement('div');
+    card.id = `dcMeta${slot}`;
+    card.className = 'dc-doc-meta-card';
+    const fields = [
+      meta.doc_date         ? ['Date', meta.doc_date] : null,
+      meta.issuing_authority ? ['Authority', meta.issuing_authority] : null,
+      meta.reference_number  ? ['Ref', meta.reference_number] : null,
+    ].filter(Boolean);
+
+    card.innerHTML = `
+      <div class="dc-doc-meta-card__head">
+        <span class="dc-slot-label">Document ${slot}</span>
+        <span class="bvj-doc-type-badge">${escapeHtml(meta.doc_type || ('Document ' + slot))}</span>
+      </div>
+      ${fields.length ? `<div class="bvj-doc-meta__fields">
+        ${fields.map(([k, v]) => `<span class="bvj-doc-meta__field"><strong>${escapeHtml(k)}:</strong> ${escapeHtml(String(v))}</span>`).join('')}
+      </div>` : ''}
+    `;
+    pair.appendChild(card);
+  }
+
+  function renderPartiesPreview(slot, parties) {
+    if (!parties.length) return;
+    ensureResultsReady();
+    const pair = els.results.querySelector('#dcDocMetaPair');
+    if (!pair) return;
+    const metaCard = pair.querySelector(`#dcMeta${slot}`);
+    if (!metaCard) return;
+
+    const existing = metaCard.querySelector('.dc-parties-preview');
+    if (existing) existing.remove();
+
+    const preview = document.createElement('div');
+    preview.className = 'dc-parties-preview';
+    preview.innerHTML = `<p class="dc-parties-count">${parties.length} party${parties.length === 1 ? '' : 'ies'} identified</p>
+      <div class="dc-parties-chips">
+        ${parties.slice(0, 6).map((p) => `<span class="dc-party-chip">${escapeHtml(p.name || p.role || '?')}</span>`).join('')}
+        ${parties.length > 6 ? `<span class="dc-party-chip dc-party-chip--more">+${parties.length - 6} more</span>` : ''}
+      </div>`;
+    metaCard.appendChild(preview);
+  }
+
+  function renderTimelinePreview(slot, events) {
+    if (!events.length) return;
+    ensureResultsReady();
+    const pair = els.results.querySelector('#dcDocMetaPair');
+    if (!pair) return;
+    const metaCard = pair.querySelector(`#dcMeta${slot}`);
+    if (!metaCard) return;
+
+    const existing = metaCard.querySelector('.dc-timeline-preview');
+    if (existing) existing.remove();
+
+    const highCount = events.filter((e) => e.significance === 'high').length;
+    const preview = document.createElement('div');
+    preview.className = 'dc-timeline-preview';
+    preview.innerHTML = `<p class="dc-parties-count">${events.length} events · ${highCount} high-significance</p>`;
+    metaCard.appendChild(preview);
+  }
+
+  // ── Final render ───────────────────────────────────────────────────────────
+
+  function renderFinalResults(data) {
+    const sources     = data.sources || [];
+    const discrepancies = Array.isArray(data.critical_discrepancies) ? data.critical_discrepancies : [];
+    const actions     = Array.isArray(data.recommended_actions) ? data.recommended_actions : [];
+    const uncertain   = Array.isArray(data.what_remains_uncertain) ? data.what_remains_uncertain : [];
+    const partiesDiff = data.parties_diff || {};
+    const tlDiff      = data.timeline_diff || {};
+    const headline    = data.headline_finding || '';
+    const nameA       = data.doc_a_name || 'Document A';
+    const nameB       = data.doc_b_name || 'Document B';
+
+    // Remove progressive doc meta pair — we'll re-render from authoritative data
+    els.results.querySelector('#dcDocMetaPair')?.remove();
+
+    // Re-render doc meta pair from final data
+    renderDocMetaCard('A', data.doc_a_meta || {});
+    renderDocMetaCard('B', data.doc_b_meta || {});
+    if ((data.parties_a || []).length) renderPartiesPreview('A', data.parties_a);
+    if ((data.parties_b || []).length) renderPartiesPreview('B', data.parties_b);
+    if ((data.timeline_a || []).length) renderTimelinePreview('A', data.timeline_a);
+    if ((data.timeline_b || []).length) renderTimelinePreview('B', data.timeline_b);
+
+    // Build tabs
+    const conflicts     = tlDiff.conflicts || [];
+    const deletedEvents = tlDiff.in_a_only || [];
+    const addedEvents   = tlDiff.in_b_only || [];
+    const procGaps      = tlDiff.procedural_gaps || [];
+    const narrative     = tlDiff.narrative_shifts || {};
+    const pRemoved      = partiesDiff.in_a_only || [];
+    const pAdded        = partiesDiff.in_b_only || [];
+    const pChanged      = partiesDiff.changed_between || [];
+
+    const totalDiscrepancies = discrepancies.length;
+    const tabCountStr = (n) => n > 0 ? ` <span class="dc-tab-count">${n}</span>` : '';
+
+    const finalHtml = `
+      <!-- Headline -->
+      ${headline ? `<div class="dr-result-block dc-headline">
+        <h3 class="dc-headline__label">Key finding</h3>
+        <p class="dc-headline__text">${escapeHtml(headline)}</p>
+      </div>` : ''}
+
+      <!-- Tabs -->
+      <div class="dc-tabs">
+        <div class="dc-tab-bar" role="tablist">
+          <button type="button" class="dc-tab is-active" data-tab="summary" role="tab">Summary${tabCountStr(totalDiscrepancies)}</button>
+          <button type="button" class="dc-tab" data-tab="parties" role="tab">Parties${tabCountStr(pRemoved.length + pAdded.length + pChanged.length)}</button>
+          <button type="button" class="dc-tab" data-tab="timeline" role="tab">Timeline${tabCountStr(conflicts.length + deletedEvents.length + addedEvents.length)}</button>
+          <button type="button" class="dc-tab" data-tab="sources" role="tab">Legal context${tabCountStr(sources.length)}</button>
+        </div>
+
+        <!-- Summary tab -->
+        <div class="dc-tab-panel is-active" data-panel="summary">
+          ${renderDiscrepanciesTab(discrepancies, sources)}
+          ${actions.length ? `<div class="dr-result-block">
+            <h3 style="margin:0 0 10px;font-size:0.95rem">Recommended actions</h3>
+            <ol class="dc-action-list">
+              ${actions.map((a) => `<li>${escapeHtml(String(a))}</li>`).join('')}
+            </ol>
+          </div>` : ''}
+          ${narrative.summary ? `<div class="dr-result-block">
+            <h3 style="margin:0 0 8px;font-size:0.95rem">Narrative shift</h3>
+            <p style="margin:0 0 10px;line-height:1.55;color:var(--ink)">${escapeHtml(narrative.summary)}</p>
+            ${(narrative.new_in_b || []).length ? `<div class="dc-narrative-block dc-narrative-block--added">
+              <strong>New in ${escapeHtml(nameB)}:</strong>
+              <ul>${(narrative.new_in_b || []).map((s) => `<li>${escapeHtml(String(s))}</li>`).join('')}</ul>
+            </div>` : ''}
+            ${(narrative.removed_from_b || []).length ? `<div class="dc-narrative-block dc-narrative-block--removed">
+              <strong>Removed from ${escapeHtml(nameB)}:</strong>
+              <ul>${(narrative.removed_from_b || []).map((s) => `<li>${escapeHtml(String(s))}</li>`).join('')}</ul>
+            </div>` : ''}
+          </div>` : ''}
+          ${uncertain.length ? `<div class="dr-result-block">
+            <h3 style="margin:0 0 8px;font-size:0.95rem;color:var(--muted)">What remains uncertain</h3>
+            <ul style="padding-left:1.2em;margin:0;color:var(--muted);line-height:1.55">
+              ${uncertain.map((u) => `<li>${escapeHtml(String(u))}</li>`).join('')}
+            </ul>
+          </div>` : ''}
+        </div>
+
+        <!-- Parties tab -->
+        <div class="dc-tab-panel" data-panel="parties">
+          ${renderPartiesTab(pRemoved, pAdded, pChanged, nameA, nameB)}
+        </div>
+
+        <!-- Timeline tab -->
+        <div class="dc-tab-panel" data-panel="timeline">
+          ${renderTimelineTab(conflicts, deletedEvents, addedEvents, procGaps, nameA, nameB)}
+        </div>
+
+        <!-- Sources tab -->
+        <div class="dc-tab-panel" data-panel="sources">
+          ${renderSourcesTab(sources)}
+        </div>
+      </div>
+
+      <p class="dc-disclaimer">${escapeHtml(data.disclaimer || 'For legal information and preparation only — not legal advice. Verify all findings with a qualified lawyer.')}</p>
+    `;
+
+    const finalContainer = document.createElement('div');
+    finalContainer.innerHTML = finalHtml;
+    while (finalContainer.firstChild) {
+      els.results.appendChild(finalContainer.firstChild);
+    }
+
+    // Bind tabs
+    els.results.querySelectorAll('.dc-tab').forEach((btn) => {
+      btn.addEventListener('click', () => {
+        const tab = btn.dataset.tab;
+        els.results.querySelectorAll('.dc-tab').forEach((b) => b.classList.remove('is-active'));
+        els.results.querySelectorAll('.dc-tab-panel').forEach((p) => p.classList.remove('is-active'));
+        btn.classList.add('is-active');
+        const panel = els.results.querySelector(`.dc-tab-panel[data-panel="${tab}"]`);
+        if (panel) panel.classList.add('is-active');
+      });
+    });
+
+    // Bind source card clicks
+    els.results.querySelectorAll('.dr-source-card[data-source-n]').forEach((node) => {
+      node.addEventListener('click', (e) => {
+        if (e.target.closest('a')) return;
+        const n = parseInt(node.dataset.sourceN, 10);
+        const src = sources.find((s) => s.n === n);
+        if (src) openModal(src);
+      });
+    });
+  }
+
+  // ── Tab content renderers ──────────────────────────────────────────────────
+
+  function renderDiscrepanciesTab(discrepancies, sources) {
+    if (!discrepancies.length) {
+      return '<div class="dr-result-block"><p style="color:var(--muted)"><em>No critical discrepancies were identified in the synthesis.</em></p></div>';
+    }
+    const sevClass = (s) => s === 'high' ? 'dc-sev--high' : (s === 'medium' ? 'dc-sev--medium' : 'dc-sev--low');
+    const catLabel = (c) => ({ timeline_conflict: 'Timeline', narrative_shift: 'Narrative', party_discrepancy: 'Party', procedural_gap: 'Procedure' }[c] || c);
+
+    return `<div class="dr-result-block">
+      <h3 style="margin:0 0 12px;font-size:0.95rem">Critical discrepancies (${discrepancies.length})</h3>
+      <div class="dc-discrepancies">
+        ${discrepancies.map((d) => `<div class="dc-discrepancy">
+          <div class="dc-discrepancy__head">
+            <div>
+              <span class="dc-cat-tag">${escapeHtml(catLabel(d.category || ''))}</span>
+              <span class="dc-severity ${sevClass(d.significance || 'low')}">${escapeHtml(d.significance || 'low')}</span>
+            </div>
+            <div class="dc-discrepancy__title">${escapeHtml(d.title || '')}</div>
+          </div>
+          <div class="dc-discrepancy__compare">
+            <div class="dc-compare-col dc-compare-col--a">
+              <span class="dc-compare-label">Document A</span>
+              <p>${escapeHtml(d.document_a_says || '—')}</p>
+            </div>
+            <div class="dc-compare-divider" aria-hidden="true">≠</div>
+            <div class="dc-compare-col dc-compare-col--b">
+              <span class="dc-compare-label">Document B</span>
+              <p>${escapeHtml(d.document_b_says || '—')}</p>
+            </div>
+          </div>
+          ${d.legal_relevance ? `<div class="dc-discrepancy__legal">
+            ${renderInlineCitations(escapeHtml(d.legal_relevance), sources)}
+          </div>` : ''}
+        </div>`).join('')}
+      </div>
+    </div>`;
+  }
+
+  function renderPartiesTab(removed, added, changed, nameA, nameB) {
+    if (!removed.length && !added.length && !changed.length) {
+      return '<div class="dr-result-block"><p style="color:var(--muted)"><em>No party discrepancies identified between the two documents.</em></p></div>';
+    }
+    let html = '<div class="dr-result-block">';
+    if (removed.length) {
+      html += `<h3 style="margin:0 0 10px;font-size:0.92rem;color:#b41e1e">Removed from ${escapeHtml(nameB)} (${removed.length})</h3>
+        <div class="dc-party-list">
+          ${removed.map((p) => `<div class="dc-party-row dc-party-row--removed">
+            <div class="dc-party-row__name">${escapeHtml(p.name || '?')}</div>
+            <div class="dc-party-row__role">${escapeHtml(p.role_in_a || '')}</div>
+            ${p.significance ? `<div class="dc-party-row__sig">${escapeHtml(p.significance)}</div>` : ''}
+          </div>`).join('')}
+        </div>`;
+    }
+    if (added.length) {
+      html += `<h3 style="margin:16px 0 10px;font-size:0.92rem;color:var(--teal-dark)">Added in ${escapeHtml(nameB)} (${added.length})</h3>
+        <div class="dc-party-list">
+          ${added.map((p) => `<div class="dc-party-row dc-party-row--added">
+            <div class="dc-party-row__name">${escapeHtml(p.name || '?')}</div>
+            <div class="dc-party-row__role">${escapeHtml(p.role_in_b || '')}</div>
+            ${p.significance ? `<div class="dc-party-row__sig">${escapeHtml(p.significance)}</div>` : ''}
+          </div>`).join('')}
+        </div>`;
+    }
+    if (changed.length) {
+      html += `<h3 style="margin:16px 0 10px;font-size:0.92rem;color:var(--ink)">Changed between versions (${changed.length})</h3>
+        <div class="dc-party-list">
+          ${changed.map((p) => `<div class="dc-party-row dc-party-row--changed">
+            <div class="dc-party-row__name">${escapeHtml(p.name || '?')}</div>
+            <div class="dc-compare-col dc-compare-col--a" style="font-size:0.82rem;padding:2px 0">${escapeHtml(p.in_a || '')}</div>
+            <div class="dc-compare-col dc-compare-col--b" style="font-size:0.82rem;padding:2px 0">${escapeHtml(p.in_b || '')}</div>
+            ${p.significance ? `<div class="dc-party-row__sig">${escapeHtml(p.significance)}</div>` : ''}
+          </div>`).join('')}
+        </div>`;
+    }
+    html += '</div>';
+    return html;
+  }
+
+  function renderTimelineTab(conflicts, deleted, added, procGaps, nameA, nameB) {
+    if (!conflicts.length && !deleted.length && !added.length && !procGaps.length) {
+      return '<div class="dr-result-block"><p style="color:var(--muted)"><em>No timeline discrepancies identified between the two documents.</em></p></div>';
+    }
+    const sigClass = (s) => `dc-sig--${s === 'high' ? 'high' : (s === 'medium' ? 'medium' : 'low')}`;
+    let html = '';
+
+    if (conflicts.length) {
+      html += `<div class="dr-result-block">
+        <h3 style="margin:0 0 10px;font-size:0.92rem">Contradictions (${conflicts.length})</h3>
+        <div class="dc-timeline-list">
+          ${conflicts.map((c) => `<div class="dc-tl-item dc-tl-item--conflict">
+            <div class="dc-tl-item__head">
+              <span class="dc-sig-badge ${sigClass(c.significance || 'low')}">${escapeHtml(c.significance || 'low')}</span>
+              ${c.date_a || c.date_b ? `<span class="dc-tl-date">${escapeHtml(c.date_a || '?')} / ${escapeHtml(c.date_b || '?')}</span>` : ''}
+            </div>
+            <div class="dc-discrepancy__compare" style="margin-top:6px">
+              <div class="dc-compare-col dc-compare-col--a">
+                <span class="dc-compare-label">${escapeHtml(nameA)}</span>
+                <p>${escapeHtml(c.doc_a_says || '—')}</p>
+              </div>
+              <div class="dc-compare-divider" aria-hidden="true">≠</div>
+              <div class="dc-compare-col dc-compare-col--b">
+                <span class="dc-compare-label">${escapeHtml(nameB)}</span>
+                <p>${escapeHtml(c.doc_b_says || '—')}</p>
+              </div>
+            </div>
+            ${c.legal_significance ? `<p class="dc-tl-legal">${escapeHtml(c.legal_significance)}</p>` : ''}
+          </div>`).join('')}
+        </div>
+      </div>`;
+    }
+
+    if (deleted.length) {
+      html += `<div class="dr-result-block">
+        <h3 style="margin:0 0 10px;font-size:0.92rem;color:#b41e1e">Deleted from ${escapeHtml(nameB)} (${deleted.length})</h3>
+        <div class="dc-timeline-list">
+          ${deleted.map((ev) => `<div class="dc-tl-item dc-tl-item--deleted">
+            <div class="dc-tl-item__head">
+              <span class="dc-sig-badge ${sigClass(ev.significance || 'low')}">${escapeHtml(ev.significance || 'low')}</span>
+              ${ev.date ? `<span class="dc-tl-date">${escapeHtml(ev.date)}</span>` : ''}
+              ${ev.actor ? `<span class="dc-tl-actor">${escapeHtml(ev.actor)}</span>` : ''}
+            </div>
+            <p class="dc-tl-desc">${escapeHtml(ev.description || '')}</p>
+            ${ev.legal_significance ? `<p class="dc-tl-legal">${escapeHtml(ev.legal_significance)}</p>` : ''}
+          </div>`).join('')}
+        </div>
+      </div>`;
+    }
+
+    if (added.length) {
+      html += `<div class="dr-result-block">
+        <h3 style="margin:0 0 10px;font-size:0.92rem;color:var(--teal-dark)">New in ${escapeHtml(nameB)} (${added.length})</h3>
+        <div class="dc-timeline-list">
+          ${added.map((ev) => `<div class="dc-tl-item dc-tl-item--added">
+            <div class="dc-tl-item__head">
+              <span class="dc-sig-badge ${sigClass(ev.significance || 'low')}">${escapeHtml(ev.significance || 'low')}</span>
+              ${ev.date ? `<span class="dc-tl-date">${escapeHtml(ev.date)}</span>` : ''}
+              ${ev.actor ? `<span class="dc-tl-actor">${escapeHtml(ev.actor)}</span>` : ''}
+            </div>
+            <p class="dc-tl-desc">${escapeHtml(ev.description || '')}</p>
+            ${ev.legal_significance ? `<p class="dc-tl-legal">${escapeHtml(ev.legal_significance)}</p>` : ''}
+          </div>`).join('')}
+        </div>
+      </div>`;
+    }
+
+    if (procGaps.length) {
+      html += `<div class="dr-result-block">
+        <h3 style="margin:0 0 10px;font-size:0.92rem;color:var(--muted)">Procedural gaps (${procGaps.length})</h3>
+        <ul style="padding-left:1.2em;margin:0;line-height:1.6">
+          ${procGaps.map((g) => `<li>${escapeHtml(g.gap || '')} <span class="dc-sig-badge ${sigClass(g.significance || 'low')}" style="margin-left:4px">${escapeHtml(g.significance || 'low')}</span></li>`).join('')}
+        </ul>
+      </div>`;
+    }
+
+    return html;
+  }
+
+  function renderSourcesTab(sources) {
+    if (!sources.length) {
+      return '<div class="dr-result-block"><p style="color:var(--muted)"><em>No corpus sources retrieved. Enable corpus slices and re-run.</em></p></div>';
+    }
+    return `<div class="dr-result-block">
+      <div class="dr-sources-head">
+        <h3>Legal context sources (${sources.length})</h3>
+        <small>Click a card to expand · external link opens original source</small>
+      </div>
+      <div class="dr-source-list">
+        ${sources.map((s) => renderSourceCard(s)).join('')}
+      </div>
+    </div>`;
+  }
+
+  function renderSourceCard(s) {
+    const score = s.reranker_score != null ? s.reranker_score : s.similarity;
+    const link  = s.deep_link || s.source_url;
+    const titleHtml = link
+      ? `<a href="${escapeHtml(link)}" target="_blank" rel="noopener" class="dr-source-title-link">${escapeHtml(s.title || 'Untitled')} <span class="dr-external-link" aria-hidden="true">↗</span></a>`
+      : `${escapeHtml(s.title || 'Untitled')}`;
+    return `<div class="dr-source-card" data-source-n="${s.n}" role="button" tabindex="0">
+      <span class="dr-source-number">${s.n}</span>
+      <div class="dr-source-body">
+        <div class="dr-source-title">${titleHtml}</div>
+        ${s.section ? `<div class="dr-source-meta"><span class="dr-source-tag">${escapeHtml(s.section)}</span></div>` : ''}
+        <div class="dr-source-meta">
+          <span class="dr-source-tag">${escapeHtml(s.package_or_corpus || 'corpus')}</span>
+          ${s.authority_label ? `<span class="dr-source-tag">${escapeHtml(s.authority_label)}</span>` : ''}
+          ${(s.matched_sub_questions || []).map((q) => `<span class="dr-source-tag">${escapeHtml(q)}</span>`).join('')}
+        </div>
+        <p class="dr-source-excerpt">${escapeHtml(truncate(s.excerpt || '', 240))}</p>
+      </div>
+      <div class="dr-source-aside">
+        <span>score<br><b>${score != null ? Number(score).toFixed(2) : '—'}</b></span>
+      </div>
+    </div>`;
+  }
+
+  // ── Source modal ───────────────────────────────────────────────────────────
+
+  function bindModal() {
+    els.modalClose?.addEventListener('click', closeModal);
+    els.modal?.addEventListener('click', (e) => { if (e.target === els.modal) closeModal(); });
+    document.addEventListener('keydown', (e) => {
+      if (e.key === 'Escape' && els.modal && !els.modal.classList.contains('is-hidden')) closeModal();
+    });
+  }
+
+  function closeModal() { els.modal?.classList.add('is-hidden'); }
+
+  function openModal(source) {
+    if (!source) return;
+    els.modalEyebrow.textContent = 'Corpus source';
+    els.modalTitle.textContent   = source.title || 'Source';
+    const metaRows = [
+      ['Number', `[${source.n}]`],
+      source.section   ? ['Section', source.section] : null,
+      ['Corpus', source.package_or_corpus || '—'],
+      source.authority_label ? ['Authority', source.authority_label] : null,
+      source.similarity != null ? ['Similarity', String(source.similarity)] : null,
+      source.reranker_score != null ? ['Rerank score', String(source.reranker_score)] : null,
+    ].filter(Boolean);
+    els.modalMeta.innerHTML = '<dl>' + metaRows.map(([k, v]) => `<dt>${escapeHtml(k)}</dt><dd>${escapeHtml(String(v))}</dd>`).join('') + '</dl>';
+    const chunkText = source.chunk_text || source.excerpt || '';
+    let html = chunkText
+      ? `<button class="dr-modal-chunk-toggle" type="button">Show matching text ▼</button><div class="dr-modal-chunk-text is-hidden">${escapeHtml(chunkText)}</div>`
+      : '<em>No excerpt available.</em>';
+    els.modalText.innerHTML = html;
+    const toggle = els.modalText.querySelector('.dr-modal-chunk-toggle');
+    const div    = els.modalText.querySelector('.dr-modal-chunk-text');
+    toggle?.addEventListener('click', () => {
+      const isHidden = div.classList.toggle('is-hidden');
+      toggle.textContent = isHidden ? 'Show matching text ▼' : 'Hide matching text ▲';
+    });
+    els.modal.classList.remove('is-hidden');
+  }
+
+  // ── Trace rendering ────────────────────────────────────────────────────────
+
+  function renderTrace(steps) {
+    if (!els.traceList) return;
+    els.traceList.classList.add('is-rich');
+    els.traceList.innerHTML = steps.map((step, i) => {
+      const statusClass = step.status === 'running' ? 'is-running'
+                       : step.status === 'complete' ? 'is-done'
+                       : step.status === 'warning'  ? 'is-warning'
+                       : step.status === 'error'    ? 'is-error'
+                       : '';
+      const marker = step.status === 'complete' ? '✓'
+                   : step.status === 'warning'  ? '!'
+                   : step.status === 'error'    ? '×'
+                   : (i + 1);
+      return `<li class="trace-step ${statusClass}">
+        <span class="trace-step__marker">${marker}</span>
+        <div>
+          <span class="trace-step__label">${escapeHtml(step.label || '')}</span>
+          <span class="trace-step__detail">${escapeHtml(step.detail || '')}</span>
+        </div>
+      </li>`;
+    }).join('');
+  }
+
+  // ── Utility ────────────────────────────────────────────────────────────────
+
+  function setStatus(message, kind) {
+    if (!els.status) return;
+    els.status.textContent = message;
+    els.status.style.color = kind === 'error' ? '#b41e1e'
+                           : kind === 'ok'    ? 'var(--teal-dark)'
+                           : 'var(--muted)';
+  }
+
+  function renderInlineCitations(escapedHtml, sources) {
+    return escapedHtml.replace(/\[(\d+(?:\s*[-,]\s*\d+)*)\]/g, (_, group) => {
+      const nums = expandCiteGroup(group);
+      return nums.map((n) => `<span class="dr-cite" data-source-n="${n}" role="button" tabindex="0">${n}</span>`).join('');
+    });
+  }
+
+  function expandCiteGroup(group) {
+    const out = [];
+    group.split(',').forEach((part) => {
+      const range = part.trim().match(/^(\d+)\s*-\s*(\d+)$/);
+      if (range) {
+        for (let i = parseInt(range[1], 10); i <= parseInt(range[2], 10); i++) out.push(i);
+      } else {
+        const n = parseInt(part.trim(), 10);
+        if (!Number.isNaN(n)) out.push(n);
+      }
+    });
+    return Array.from(new Set(out));
+  }
+
+  function escapeHtml(s) {
+    return String(s)
+      .replace(/&/g, '&amp;')
+      .replace(/</g, '&lt;')
+      .replace(/>/g, '&gt;')
+      .replace(/"/g, '&quot;')
+      .replace(/'/g, '&#039;');
+  }
+
+  function truncate(s, n) {
+    if (!s || s.length <= n) return s || '';
+    return s.slice(0, n - 1) + '…';
+  }
+})();

discrepancy.php

@@ -0,0 +1,176 @@
+<?php
+declare(strict_types=1);
+$toolName     = 'discrepancy';
+$toolTitle    = 'Discrepancy Finder';
+$toolKind     = 'Document comparison';
+$toolBadge    = 'Cross-document AI';
+$extraScripts = ['assets/js/discrepancy.js'];
+require_once __DIR__ . '/includes/layout.php';
+?>
+                <form id="dcForm" class="tool-form deep-research" enctype="multipart/form-data">
+
+                    <div class="lang-switcher" id="dcLangSwitcher" role="group" aria-label="UI language">
+                        <button type="button" class="lang-btn is-active" data-lang="en">&#127468;&#127463; EN</button>
+                        <button type="button" class="lang-btn" data-lang="no">&#127475;&#127476; NO</button>
+                        <button type="button" class="lang-btn" data-lang="uk">&#127482;&#127462; UK</button>
+                        <button type="button" class="lang-btn" data-lang="pl">&#127477;&#127473; PL</button>
+                    </div>
+
+                    <p class="upload-hint" style="margin-bottom:1.2rem">Upload two versions of the same Barnevernet document &mdash; or any two related documents &mdash; and the agent will find contradictions, deleted facts, new allegations, and party changes between them. Results include corpus-backed legal significance for each discrepancy.</p>
+
+                    <!-- Two upload zones side by side -->
+                    <div class="dc-upload-pair">
+
+                        <div class="dc-upload-slot">
+                            <p class="control-label">Document A <span class="dc-slot-hint">&mdash; Earlier / Original</span></p>
+                            <div class="upload-zone dc-zone" id="dcZoneA" role="region" aria-label="Document A upload">
+                                <input type="file" id="dcInputA" accept=".pdf,.docx,.txt" aria-label="Choose Document A">
+                                <div id="dcPromptA" class="upload-prompt">
+                                    <span class="upload-icon" aria-hidden="true">&#8679;</span>
+                                    <p>Drop here or <label for="dcInputA" class="upload-browse">browse</label></p>
+                                    <p class="upload-hint"><strong>PDF</strong>, <strong>DOCX</strong>, <strong>TXT</strong> &mdash; max 8 MB</p>
+                                </div>
+                                <div id="dcFileInfoA" class="upload-file is-hidden">
+                                    <span id="dcFileNameA" class="upload-filename"></span>
+                                    <button type="button" id="dcClearA" class="upload-clear">&times;</button>
+                                </div>
+                            </div>
+                        </div>
+
+                        <div class="dc-upload-slot">
+                            <p class="control-label">Document B <span class="dc-slot-hint">&mdash; Later / Comparison</span></p>
+                            <div class="upload-zone dc-zone" id="dcZoneB" role="region" aria-label="Document B upload">
+                                <input type="file" id="dcInputB" accept=".pdf,.docx,.txt" aria-label="Choose Document B">
+                                <div id="dcPromptB" class="upload-prompt">
+                                    <span class="upload-icon" aria-hidden="true">&#8679;</span>
+                                    <p>Drop here or <label for="dcInputB" class="upload-browse">browse</label></p>
+                                    <p class="upload-hint"><strong>PDF</strong>, <strong>DOCX</strong>, <strong>TXT</strong> &mdash; max 8 MB</p>
+                                </div>
+                                <div id="dcFileInfoB" class="upload-file is-hidden">
+                                    <span id="dcFileNameB" class="upload-filename"></span>
+                                    <button type="button" id="dcClearB" class="upload-clear">&times;</button>
+                                </div>
+                            </div>
+                        </div>
+
+                    </div>
+
+                    <div class="control-row" id="dcEngineControl">
+                        <span class="control-label">Engine</span>
+                        <label><input type="radio" name="dcEngine" value="azure_mini" checked> Azure gpt-4o-mini &#9733; <small class="control-hint">(~60-90s)</small></label>
+                        <label><input type="radio" name="dcEngine" value="azure_full"> Azure gpt-4o <small class="control-hint">(best · ~2-3 min)</small></label>
+                        <label><input type="radio" name="dcEngine" value="gpu"> GPU qwen2.5:14b <small class="control-hint">(local · ~90s)</small></label>
+                    </div>
+                    <p class="upload-hint">Engine applies to the final synthesis only. Document classification, party extraction, timelines, and cross-referencing always use azure-mini.</p>
+
+                    <details class="advanced-panel" id="dcSlicePanel">
+                        <summary class="advanced-toggle">Corpus slices <span class="control-hint">(used for legal significance context)</span></summary>
+                        <p class="upload-hint" style="margin:8px 0">The corpus provides legal significance context for each discrepancy found. All four default slices cover the core Barnevernet framework.</p>
+                        <div class="dr-slice-grid">
+                            <button type="button" class="adv-slice is-on" data-slice="child_welfare" aria-pressed="true">
+                                <div class="dr-slice__head">
+                                    <span class="dr-slice__title">Child Welfare</span>
+                                    <span class="dr-slice__badge">on</span>
+                                </div>
+                                <p class="dr-slice__tagline">Barnevern, omsorgsovertakelse, foster care</p>
+                            </button>
+                            <button type="button" class="adv-slice is-on" data-slice="echr" aria-pressed="true">
+                                <div class="dr-slice__head">
+                                    <span class="dr-slice__title">ECHR</span>
+                                    <span class="dr-slice__badge">on</span>
+                                </div>
+                                <p class="dr-slice__tagline">Art.&nbsp;8 family life, procedural fairness, HUDOC vs Norway</p>
+                            </button>
+                            <button type="button" class="adv-slice is-on" data-slice="family_core" aria-pressed="true">
+                                <div class="dr-slice__head">
+                                    <span class="dr-slice__title">Family Law Core</span>
+                                    <span class="dr-slice__badge">on</span>
+                                </div>
+                                <p class="dr-slice__tagline">Barneloven, custody, samvær, mediation</p>
+                            </button>
+                            <button type="button" class="adv-slice is-on" data-slice="bufdir_guidance" aria-pressed="true">
+                                <div class="dr-slice__head">
+                                    <span class="dr-slice__title">Bufdir Guidance</span>
+                                    <span class="dr-slice__badge">on</span>
+                                </div>
+                                <p class="dr-slice__tagline">Bufdir, Barneombudet, Statsforvalteren standards</p>
+                            </button>
+                            <button type="button" class="adv-slice" data-slice="norwegian_courts" aria-pressed="false">
+                                <div class="dr-slice__head">
+                                    <span class="dr-slice__title">Norwegian Courts</span>
+                                    <span class="dr-slice__badge">off</span>
+                                </div>
+                                <p class="dr-slice__tagline">Høyesterett + Lagmannsrett family decisions</p>
+                            </button>
+                            <button type="button" class="adv-slice" data-slice="broader_legal" aria-pressed="false">
+                                <div class="dr-slice__head">
+                                    <span class="dr-slice__title">Broader Legal</span>
+                                    <span class="dr-slice__badge">off</span>
+                                </div>
+                                <p class="dr-slice__tagline">NOUer, statutes, government background</p>
+                            </button>
+                        </div>
+                    </details>
+
+                    <div class="form-footer">
+                        <p id="dcStatus" class="form-status" role="status" aria-live="polite"></p>
+                        <button id="dcRunButton" type="submit">Find discrepancies</button>
+                    </div>
+                </form>
+
+                <section id="dcResults" class="results deep-research-results" aria-live="polite">
+                    <div class="empty-state">
+                        <h3>Ready</h3>
+                        <p>Upload two Barnevernet documents, then run. The agent will classify each document, extract parties and timelines, cross-reference them for discrepancies, and produce a corpus-backed legal significance report.</p>
+                        <p class="upload-hint" style="margin-top:8px">Typical use: compare the original Bekymringsmelding against the later Vedtak, or compare two versions of a Barnevernet investigation report.</p>
+                    </div>
+                </section>
+
+                <!-- Source modal -->
+                <div id="dcSourceModal" class="dr-source-modal is-hidden" role="dialog" aria-modal="true" aria-labelledby="dcSourceModalTitle">
+                    <div class="dr-source-modal__dialog">
+                        <header class="dr-source-modal__head">
+                            <div>
+                                <p class="eyebrow" id="dcSourceModalEyebrow">Source</p>
+                                <h3 id="dcSourceModalTitle"></h3>
+                            </div>
+                            <button type="button" id="dcSourceModalClose" class="upload-clear" aria-label="Close">&times;</button>
+                        </header>
+                        <div class="dr-source-modal__body">
+                            <aside class="dr-source-modal__meta" id="dcSourceModalMeta"></aside>
+                            <div class="dr-source-modal__text" id="dcSourceModalText"></div>
+                        </div>
+                    </div>
+                </div>
+
+                <!-- Hidden stubs so tools.js element refs don't crash on this page -->
+                <div class="is-hidden" id="languageControl" aria-hidden="true">
+                    <input type="radio" name="language" value="en" checked>
+                    <input type="radio" name="language" value="no">
+                    <input type="radio" name="language" value="uk">
+                    <input type="radio" name="language" value="pl">
+                </div>
+                <div class="is-hidden" id="redactionControl" aria-hidden="true"></div>
+                <div class="is-hidden" id="audioZone" aria-hidden="true">
+                    <input type="file" id="audioInput" style="display:none">
+                    <div id="audioPrompt"></div>
+                    <div id="audioFileInfo"><ol id="audioQueueList"></ol><button type="button" id="audioClear"></button></div>
+                </div>
+                <div class="is-hidden" id="diarizeControl" aria-hidden="true">
+                    <input type="checkbox" id="diarizeCheck">
+                    <input type="number" id="numSpeakersInput">
+                </div>
+                <div class="is-hidden" id="transcribeLangControl" aria-hidden="true"><input type="radio" name="transcribeLang" value="no" checked></div>
+                <div class="is-hidden" id="vocabControl" aria-hidden="true">
+                    <div id="vocabPresets"></div>
+                    <textarea id="initPromptInput"></textarea>
+                </div>
+                <div class="is-hidden" id="aliasSection" aria-hidden="true">
+                    <button type="button" id="addAliasRow"></button>
+                    <div id="aliasRows"></div>
+                </div>
+                <div class="is-hidden" id="exemptSection" aria-hidden="true">
+                    <button type="button" id="addExemptRow"></button>
+                    <div id="exemptRows"></div>
+                </div>
+<?php require_once __DIR__ . '/includes/layout_footer.php'; ?>

includes/FreeTier.php

@@ -25,6 +25,7 @@ final class FreeTier
         'advocate'      => 3,
         'deep-research' => 5,
         'transcribe'    => 2,  // flat rate; actual duration unknown upfront
+        'discrepancy'   => 4,  // 2 docs × 4 extraction steps + cross-ref + synthesis
     ];
 
     /** Credit cost for a given tool slug. Returns 1 for unknown tools. */

includes/i18n.php

@@ -444,6 +444,7 @@ function dbnToolsLaunchedTools(?string $language = null): array
             'barnevernet' => ['BVJ Analyzer', 'Barnevernet documents', 'Analyze child-welfare documents from your perspective with procedural red flags and citations.', 'Document + RAG'],
             'advocate' => ['Advocate', 'Partisan brief', 'Choose who you represent and generate a source-grounded brief for that position.', 'ECHR + Lovdata'],
             'deep-research' => ['Deep Research', 'Agent + RAG', 'Expand a question into research angles, search legal slices, and synthesize a cited brief.', 'Family-legal'],
+            'discrepancy' => ['Discrepancy Finder', 'Document comparison', 'Upload two versions of a Barnevernet document and find contradictions, deleted facts, and new allegations.', 'Cross-document AI'],
             'corpus' => ['Corpus', 'Legal knowledge base', 'Inspect indexed sources, corpus health, legal categories, and retrieval behavior.', '~220 K passages'],
         ],
         'no' => [
@@ -453,6 +454,7 @@ function dbnToolsLaunchedTools(?string $language = null): array
             'barnevernet' => ['BVJ-analyse', 'Barnevernsdokumenter', 'Analyser barnevernsdokumenter fra ditt perspektiv med prosessuelle røde flagg og kilder.', 'Dokument + RAG'],
             'advocate' => ['Advokatmodus', 'Partsinnlegg', 'Velg hvem du representerer og lag et kildebelagt innlegg for den posisjonen.', 'EMD + Lovdata'],
             'deep-research' => ['Dyp research', 'Agent + RAG', 'Utvid et spørsmål til forskningsvinkler, søk juridiske kilder og lag et kildebelagt notat.', 'Familierett'],
+            'discrepancy' => ['Avviksfinner', 'Dokumentsammenligning', 'Last opp to versjoner av et barneverndokument og finn motsigelser, slettede fakta og nye påstander.', 'Kryssdokument AI'],
             'corpus' => ['Korpus', 'Juridisk kunnskapsbase', 'Se indekserte kilder, korpushelse, juridiske kategorier og søkeoppsett.', '~220 K utdrag'],
         ],
         'uk' => [
@@ -462,6 +464,7 @@ function dbnToolsLaunchedTools(?string $language = null): array
             'barnevernet' => ['BVJ аналізатор', 'Документи Barnevernet', 'Аналізуйте документи захисту дітей з вашої позиції, з процесуальними ризиками та джерелами.', 'Документ + RAG'],
             'advocate' => ['Адвокат', 'Позиційний бриф', 'Оберіть, кого представляєте, і створіть бриф із джерелами на підтримку цієї позиції.', 'ЄСПЛ + Lovdata'],
             'deep-research' => ['Глибоке дослідження', 'Agent + RAG', 'Розгортає питання в дослідницькі напрями, шукає юридичні джерела та створює бриф.', 'Сімейне право'],
+            'discrepancy' => ['Пошук розбіжностей', 'Порівняння документів', 'Завантажте дві версії документа Barnevernet і знайдіть суперечності, видалені факти та нові твердження.', 'Міждокументний AI'],
             'corpus' => ['Корпус', 'Юридична база знань', 'Переглядайте індексовані джерела, стан корпусу, категорії та поведінку пошуку.', '~220 тис. уривків'],
         ],
         'pl' => [
@@ -471,20 +474,22 @@ function dbnToolsLaunchedTools(?string $language = null): array
             'barnevernet' => ['Analizator BVJ', 'Dokumenty Barnevernet', 'Analizuj dokumenty opieki nad dziećmi z Twojej perspektywy, z ryzykami proceduralnymi i źródłami.', 'Dokument + RAG'],
             'advocate' => ['Adwokat', 'Stronniczy brief', 'Wybierz, kogo reprezentujesz, i wygeneruj brief oparty na źródłach dla tej pozycji.', 'ETPC + Lovdata'],
             'deep-research' => ['Głębokie badanie', 'Agent + RAG', 'Rozwija pytanie w kierunki badawcze, przeszukuje źródła prawne i tworzy brief z cytatami.', 'Prawo rodzinne'],
+            'discrepancy' => ['Wyszukiwacz rozbieżności', 'Porównanie dokumentów', 'Prześlij dwie wersje dokumentu Barnevernet i znajdź sprzeczności, usunięte fakty i nowe zarzuty.', 'AI Między-dokumentowe'],
             'corpus' => ['Korpus', 'Prawna baza wiedzy', 'Sprawdzaj indeksowane źródła, stan korpusu, kategorie prawne i działanie wyszukiwania.', '~220 tys. fragmentów'],
         ],
     ];
 
     $selected = $copy[$language] ?? $copy['en'];
-    $order = ['transcribe', 'timeline', 'redact', 'barnevernet', 'advocate', 'deep-research', 'corpus'];
+    $order = ['transcribe', 'timeline', 'redact', 'barnevernet', 'advocate', 'deep-research', 'discrepancy', 'corpus'];
     $icons = [
-        'transcribe' => 'TR',
-        'timeline' => 'TL',
-        'redact' => 'RX',
-        'barnevernet' => 'BVJ',
-        'advocate' => 'ADV',
+        'transcribe'   => 'TR',
+        'timeline'     => 'TL',
+        'redact'       => 'RX',
+        'barnevernet'  => 'BVJ',
+        'advocate'     => 'ADV',
         'deep-research' => 'DR',
-        'corpus' => 'KB',
+        'discrepancy'  => 'DC',
+        'corpus'       => 'KB',
     ];
     $out = [];
     foreach ($order as $slug) {

includes/tool-svgs.php

@@ -16,5 +16,7 @@ $toolSvgs = [
 
     'deep-research' => '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 480 178" preserveAspectRatio="xMidYMid slice" aria-hidden="true"><rect width="480" height="178" fill="#00205b"/><g stroke="rgba(244,197,66,0.24)" stroke-width="1.5" fill="none"><line x1="88" y1="48" x2="178" y2="88"/><line x1="88" y1="48" x2="88" y2="138"/><line x1="88" y1="138" x2="178" y2="88"/><line x1="178" y1="88" x2="268" y2="48"/><line x1="178" y1="88" x2="268" y2="138"/><line x1="268" y1="48" x2="268" y2="138"/><line x1="268" y1="48" x2="358" y2="68"/><line x1="268" y1="138" x2="358" y2="128"/></g><circle cx="88" cy="48" r="10" fill="rgba(244,197,66,0.68)"/><circle cx="88" cy="138" r="8" fill="rgba(255,255,255,0.46)"/><circle cx="178" cy="88" r="13" fill="#f4c542"/><circle cx="268" cy="48" r="9" fill="rgba(255,255,255,0.46)"/><circle cx="268" cy="138" r="8" fill="rgba(244,197,66,0.56)"/><circle cx="358" cy="68" r="9" fill="rgba(255,255,255,0.38)"/><circle cx="358" cy="128" r="8" fill="rgba(244,197,66,0.46)"/><circle cx="358" cy="88" r="44" fill="none" stroke="rgba(255,255,255,0.55)" stroke-width="3"/><line x1="392" y1="122" x2="424" y2="154" stroke="rgba(255,255,255,0.55)" stroke-width="4" stroke-linecap="round"/><circle cx="350" cy="80" r="6" fill="rgba(244,197,66,0.88)"/><circle cx="370" cy="96" r="5" fill="rgba(255,255,255,0.78)"/><line x1="350" y1="80" x2="370" y2="96" stroke="rgba(244,197,66,0.46)" stroke-width="1.5"/></svg>',
 
+    'discrepancy' => '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 480 178" preserveAspectRatio="xMidYMid slice" aria-hidden="true"><rect width="480" height="178" fill="#00205b"/><rect x="0" y="0" width="480" height="6" fill="rgba(186,12,47,0.18)"/><rect x="0" y="172" width="480" height="6" fill="rgba(186,12,47,0.18)"/><rect x="60" y="24" width="144" height="132" rx="4" fill="rgba(0,0,0,0.20)"/><rect x="57" y="21" width="144" height="132" rx="4" fill="#fff" opacity="0.97"/><rect x="57" y="21" width="144" height="26" rx="4" fill="#00205b"/><rect x="57" y="38" width="144" height="9" fill="#00205b"/><line x1="72" y1="32" x2="130" y2="32" stroke="rgba(255,255,255,0.58)" stroke-width="1.5"/><line x1="72" y1="60" x2="186" y2="60" stroke="rgba(0,0,0,0.09)" stroke-width="1.5"/><line x1="72" y1="72" x2="172" y2="72" stroke="rgba(0,0,0,0.09)" stroke-width="1.5"/><rect x="57" y="80" width="144" height="13" fill="rgba(244,197,66,0.20)"/><line x1="72" y1="87" x2="180" y2="87" stroke="rgba(244,197,66,0.68)" stroke-width="1.5"/><line x1="72" y1="103" x2="178" y2="103" stroke="rgba(0,0,0,0.09)" stroke-width="1.5"/><line x1="72" y1="115" x2="164" y2="115" stroke="rgba(0,0,0,0.09)" stroke-width="1.5"/><line x1="72" y1="127" x2="174" y2="127" stroke="rgba(186,12,47,0.28)" stroke-width="1.5" stroke-dasharray="22,4"/><line x1="72" y1="139" x2="148" y2="139" stroke="rgba(0,0,0,0.07)" stroke-width="1.5"/><text x="129" y="17" text-anchor="middle" font-family="monospace" font-size="8" fill="rgba(244,197,66,0.68)">DOC A</text><line x1="215" y1="87" x2="265" y2="87" stroke="rgba(186,12,47,0.70)" stroke-width="2" stroke-dasharray="5,3"/><polygon points="260,83 268,87 260,91" fill="rgba(186,12,47,0.70)"/><text x="240" y="82" text-anchor="middle" font-family="monospace" font-size="9" fill="rgba(186,12,47,0.82)">≠</text><line x1="215" y1="127" x2="265" y2="93" stroke="rgba(186,12,47,0.28)" stroke-width="1" stroke-dasharray="3,3"/><rect x="276" y="24" width="144" height="132" rx="4" fill="rgba(0,0,0,0.20)"/><rect x="273" y="21" width="144" height="132" rx="4" fill="#fff" opacity="0.97"/><rect x="273" y="21" width="144" height="26" rx="4" fill="#00205b"/><rect x="273" y="38" width="144" height="9" fill="#00205b"/><line x1="288" y1="32" x2="346" y2="32" stroke="rgba(255,255,255,0.58)" stroke-width="1.5"/><line x1="288" y1="60" x2="402" y2="60" stroke="rgba(0,0,0,0.09)" stroke-width="1.5"/><line x1="288" y1="72" x2="388" y2="72" stroke="rgba(0,0,0,0.09)" stroke-width="1.5"/><rect x="273" y="80" width="144" height="13" fill="rgba(186,12,47,0.13)"/><line x1="288" y1="87" x2="396" y2="87" stroke="rgba(186,12,47,0.55)" stroke-width="1.5"/><line x1="288" y1="103" x2="394" y2="103" stroke="rgba(0,0,0,0.09)" stroke-width="1.5"/><line x1="288" y1="115" x2="380" y2="115" stroke="rgba(0,0,0,0.09)" stroke-width="1.5"/><rect x="273" y="123" width="144" height="13" fill="rgba(244,197,66,0.10)"/><line x1="288" y1="130" x2="390" y2="130" stroke="rgba(244,197,66,0.42)" stroke-width="1.5"/><line x1="288" y1="143" x2="368" y2="143" stroke="rgba(0,0,0,0.07)" stroke-width="1.5"/><text x="345" y="17" text-anchor="middle" font-family="monospace" font-size="8" fill="rgba(244,197,66,0.68)">DOC B</text></svg>',
+
     'corpus' => '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 480 178" preserveAspectRatio="xMidYMid slice" aria-hidden="true"><rect width="480" height="178" fill="#00205b"/><g stroke="rgba(244,197,66,0.28)" stroke-width="1.5" fill="none"><line x1="286" y1="54" x2="376" y2="36"/><line x1="286" y1="89" x2="390" y2="89"/><line x1="286" y1="124" x2="376" y2="143"/></g><circle cx="382" cy="36" r="16" fill="rgba(244,197,66,0.15)" stroke="rgba(244,197,66,0.38)" stroke-width="1.5"/><circle cx="396" cy="89" r="13" fill="rgba(255,255,255,0.06)" stroke="rgba(255,255,255,0.22)" stroke-width="1.5"/><circle cx="382" cy="143" r="16" fill="rgba(186,12,47,0.14)" stroke="rgba(186,12,47,0.34)" stroke-width="1.5"/><text x="382" y="40" text-anchor="middle" font-family="monospace" font-size="8" fill="rgba(244,197,66,0.72)">ECHR</text><text x="396" y="93" text-anchor="middle" font-family="monospace" font-size="7" fill="rgba(255,255,255,0.52)">LOV</text><text x="382" y="147" text-anchor="middle" font-family="monospace" font-size="7" fill="rgba(255,200,200,0.52)">BVJ</text><ellipse cx="196" cy="40" rx="78" ry="13" fill="rgba(0,18,56,0.94)" stroke="rgba(244,197,66,0.68)" stroke-width="1.5"/><rect x="118" y="40" width="156" height="26" fill="rgba(0,14,46,0.96)"/><ellipse cx="196" cy="66" rx="78" ry="13" fill="rgba(0,12,40,0.96)" stroke="rgba(244,197,66,0.48)" stroke-width="1.5"/><text x="196" y="58" text-anchor="middle" font-family="monospace" font-size="9" fill="rgba(244,197,66,0.62)">220K PASSAGES</text><ellipse cx="196" cy="78" rx="78" ry="13" fill="rgba(0,28,76,0.94)" stroke="rgba(255,255,255,0.36)" stroke-width="1.5"/><rect x="118" y="78" width="156" height="26" fill="rgba(0,12,46,0.96)"/><ellipse cx="196" cy="104" rx="78" ry="13" fill="rgba(0,10,38,0.96)" stroke="rgba(255,255,255,0.26)" stroke-width="1.5"/><text x="196" y="96" text-anchor="middle" font-family="monospace" font-size="9" fill="rgba(255,255,255,0.46)">QDRANT + AZURE</text><ellipse cx="196" cy="116" rx="78" ry="13" fill="rgba(186,12,47,0.18)" stroke="rgba(186,12,47,0.48)" stroke-width="1.5"/><rect x="118" y="116" width="156" height="20" fill="rgba(100,4,18,0.14)"/><ellipse cx="196" cy="136" rx="78" ry="13" fill="rgba(80,3,14,0.20)" stroke="rgba(186,12,47,0.32)" stroke-width="1.5"/><text x="196" y="130" text-anchor="middle" font-family="monospace" font-size="9" fill="rgba(255,170,170,0.48)">NOMIC EMBED</text></svg>',
 ];