diff --git a/README.md b/README.md
index 9c67de5c..7e38294e 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,10 @@
 # GeoIntel
 
+GeoIntel ondersteunt een gesynchroniseerde tweeschermwerkruimte: de kaart blijft
+maximaal zichtbaar op het hoofdscherm terwijl analyses, kwaliteitsbewijs en
+resultaten live in een tweede venster staan. Zie
+[`docs/DUAL_DISPLAY_WORKFLOW.md`](docs/DUAL_DISPLAY_WORKFLOW.md).
+
 <p align="center">
   <img src="frontend/public/geointel-icon.png" width="92" alt="GeoIntel logo">
 </p>
diff --git a/docs/CODEX_EXECUTION_LOG.md b/docs/CODEX_EXECUTION_LOG.md
index 2190d024..96645a55 100644
--- a/docs/CODEX_EXECUTION_LOG.md
+++ b/docs/CODEX_EXECUTION_LOG.md
@@ -1,3 +1,23 @@
+## 2026-08-21 - Gesynchroniseerde tweeschermwerkruimte
+
+### Opgeleverd
+
+- Een nieuwe knop in de werkbalk opent een afzonderlijke analyseconsole voor
+  een tweede monitor.
+- De bestaande resultatenlade wordt via een React-portal verplaatst. Kaart en
+  console delen daardoor exact dezelfde selectie-, analyse- en QA-state zonder
+  dubbele API-aanvragen.
+- Het venster onthoudt positie en afmetingen, meldt popupblokkering en valt bij
+  sluiten zonder dataverlies terug naar de gewone éénschermlade.
+- Operator en demo krijgen dezelfde functie; bestaande rechten wijzigen niet.
+
+### Verificatie
+
+- TypeScript typecheck, gerichte Vitest-regressies en productiebuild slagen.
+- De live gastwerkstroom is lokaal tegen de Tower-backend doorlopen: tweede
+  scherm openen, gebied selecteren, thema analyseren en dezelfde resultaten na
+  sluiten terugvinden in de hoofdinterface.
+
 ## 2026-08-10 - V74 root-cause remediation en authority-first uitvoer
 
 ### Opgeleverd
diff --git a/docs/DUAL_DISPLAY_WORKFLOW.md b/docs/DUAL_DISPLAY_WORKFLOW.md
new file mode 100644
index 00000000..eccd8a00
--- /dev/null
+++ b/docs/DUAL_DISPLAY_WORKFLOW.md
@@ -0,0 +1,30 @@
+# Tweeschermwerkruimte
+
+GeoIntel kan de kaart en de analyseconsole over twee browservensters verdelen
+zonder een tweede sessie of dubbele analyse te starten.
+
+## Gebruik
+
+1. Open de kaartwerkruimte.
+2. Kies **Open tweede scherm** in de bovenbalk.
+3. Verplaats de analyseconsole naar het tweede beeldscherm wanneer de browser
+   dit niet automatisch doet.
+4. Selecteer gebieden, bronnen en modellen op het hoofdscherm. Voortgang,
+   resultaten, GRB-controle, grafieken en downloads verschijnen live in de
+   analyseconsole.
+5. Gebruik **Sluit console** in het tweede venster of **Sluit tweede scherm**
+   in de bovenbalk om terug te keren naar de normale resultatenlade.
+
+De laatst gebruikte vensterpositie en -afmetingen worden lokaal onthouden. Als
+de browser pop-ups blokkeert, toont GeoIntel een concrete melding. Er gaat geen
+analyse verloren wanneer het tweede venster wordt gesloten.
+
+## Technisch contract
+
+- De console is een React-portal van dezelfde actieve werkruimte.
+- Er ontstaat geen tweede API-sessie, modelrun of onafhankelijke statekopie.
+- Kaartselectie, modelkeuze, laadstatus, QA-bewijs en resultaten blijven daarom
+  synchroon.
+- De normale éénscherminterface blijft de fail-safe fallback.
+- De functie is beschikbaar voor operator- en demosessies; bestaande
+  autorisatiegrenzen veranderen niet.
diff --git a/docs/TODO.md b/docs/TODO.md
index 9f7917d3..ba320630 100644
--- a/docs/TODO.md
+++ b/docs/TODO.md
@@ -1,5 +1,12 @@
 # GeoIntel TODO
 
+## Tweeschermwerkruimte (2026-08-21)
+
+- [x] Voeg een gesynchroniseerde analyseconsole voor een tweede beeldscherm toe.
+- [x] Verplaats dezelfde React-resultaatstate zonder dubbele API-calls of runs.
+- [x] Onthoud vensterpositie en herstel veilig naar de éénschermlade.
+- [x] Voorzie popupfoutmelding, toetsenbordlabels en operator-/demopariteit.
+
 ## V74 authority-first gebouwresultaten (2026-08-10)
 
 - [x] Voer een V72-foutanalyse, hard-negative proposal-filter en rehearsal
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 4047c342..e5d88b15 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -1,5 +1,5 @@
 import { useEffect, useMemo, useRef, useState } from 'react'
-import { CircleAlert, LogOut, ShieldCheck, UserRound } from 'lucide-react'
+import { CircleAlert, LogOut, MonitorUp, ShieldCheck, UserRound } from 'lucide-react'
 import '@fontsource/manrope/latin-500.css'
 import '@fontsource/manrope/latin-600.css'
 import '@fontsource/manrope/latin-700.css'
@@ -37,6 +37,7 @@ import {
   type WorkspaceNavigationItem,
 } from './components/shell/WorkbenchNavigation'
 import { WorkspaceSignal } from './components/shell/WorkspaceSignal'
+import { useSecondaryDisplay } from './components/shell/SecondaryDisplay'
 import { useChangeDetectionWorkflow } from './hooks/useChangeDetectionWorkflow'
 import { useDemoWorkflow } from './hooks/useDemoWorkflow'
 import { useCoverageResolver } from './hooks/useCoverageResolver'
@@ -119,6 +120,7 @@ function WorkbenchApp({ username, accessMode, loggingOut, onLogout }: WorkbenchA
   const [activeWorkspace, setActiveWorkspace] = useState<WorkspaceKey>('map')
   const [inspectorOpen, setInspectorOpen] = useState(false)
   const [guestDemoReady, setGuestDemoReady] = useState(!isGuest)
+  const secondaryDisplay = useSecondaryDisplay()
   const guestDemoStartedRef = useRef(false)
   const visibleWorkspaceItems = useMemo(
     () => isGuest ? workspaceNavItems.filter((item) => guestWorkspaceKeys.has(item.key)) : workspaceNavItems,
@@ -830,7 +832,7 @@ function WorkbenchApp({ username, accessMode, loggingOut, onLogout }: WorkbenchA
             : 'Geen actieve laag'
 
   return (
-    <div className={isGuest ? "app-shell workbench-shell workbench-shell-guest" : "app-shell workbench-shell"}>
+    <div className={`${isGuest ? 'app-shell workbench-shell workbench-shell-guest' : 'app-shell workbench-shell'}${secondaryDisplay.isOpen ? ' workbench-shell-dual-display' : ''}`}>
       <a
         className="skip-link"
         href="#workspace-main"
@@ -887,6 +889,20 @@ function WorkbenchApp({ username, accessMode, loggingOut, onLogout }: WorkbenchA
               <span aria-hidden="true" />
               <strong>{workspaceDataLoading ? 'Laden' : errorMessage ? 'Aandacht' : 'Gereed'}</strong>
             </div>
+            <button
+              type="button"
+              className={secondaryDisplay.isOpen ? 'secondary-display-launch secondary-display-launch-active' : 'secondary-display-launch'}
+              aria-pressed={secondaryDisplay.isOpen}
+              aria-describedby={secondaryDisplay.error ? 'secondary-display-error' : undefined}
+              onClick={() => {
+                setActiveWorkspace('map')
+                if (secondaryDisplay.isOpen) secondaryDisplay.close()
+                else secondaryDisplay.open()
+              }}
+            >
+              <MonitorUp aria-hidden="true" />
+              <span>{secondaryDisplay.isOpen ? 'Sluit tweede scherm' : 'Open tweede scherm'}</span>
+            </button>
             {username || isGuest ? (
               <div
                 className={isGuest ? 'context-account context-account-guest' : 'context-account'}
@@ -902,6 +918,13 @@ function WorkbenchApp({ username, accessMode, loggingOut, onLogout }: WorkbenchA
             ) : null}
           </header>
 
+          {secondaryDisplay.error ? (
+            <div className="secondary-display-error" id="secondary-display-error" role="alert">
+              <CircleAlert aria-hidden="true" />
+              <span>{secondaryDisplay.error}</span>
+            </div>
+          ) : null}
+
           {isGuest ? (
             <div className="guest-mode-banner" role="status">
               <ShieldCheck aria-hidden="true" />
@@ -1031,6 +1054,7 @@ function WorkbenchApp({ username, accessMode, loggingOut, onLogout }: WorkbenchA
           <div className="workspace-persistent-map" hidden={activeWorkspace !== 'map'}>
             <MapWorkspace
               readOnly={false}
+              secondaryResultsContainer={secondaryDisplay.container}
               selectedProjectId={selectedProjectId}
               projects={projects}
               areas={areas}
diff --git a/frontend/src/components/map/MapWorkspace.tsx b/frontend/src/components/map/MapWorkspace.tsx
index 975875ba..5ef71cd0 100644
--- a/frontend/src/components/map/MapWorkspace.tsx
+++ b/frontend/src/components/map/MapWorkspace.tsx
@@ -9,6 +9,7 @@ import { getDatasetDisplayName, getDatasetSourceDisplayName } from '../../lib/da
 import { TemporalTrendChart } from './TemporalTrendChart'
 import { MunicipalitySearch } from './MunicipalitySearch'
 import { LiveAnalysisJourney } from './LiveAnalysisJourney'
+import { SecondaryDisplayTarget } from '../shell/SecondaryDisplay'
 import { terrainImageUrl } from '../../lib/terrainImage'
 import { floodHazardImageUrl } from '../../lib/floodHazardImage'
 import { thematicRasterImageUrl, walousRasterImageUrl } from '../../lib/thematicRaster'
@@ -645,6 +646,7 @@ function floodScenarioLabel(dataset: DatasetCreateResponse): string {
 
 interface MapWorkspaceProps {
   readOnly?: boolean
+  secondaryResultsContainer?: HTMLElement | null
   selectedProjectId: string | null
   projects: ProjectRead[]
   areas: AreaRead[]
@@ -740,6 +742,7 @@ interface MapWorkspaceProps {
 
 export function MapWorkspace({
   readOnly = false,
+  secondaryResultsContainer = null,
   selectedProjectId,
   projects,
   areas,
@@ -2689,25 +2692,28 @@ export function MapWorkspace({
             </div>
           </div>
 
-          <button
-            className={resultsPanelOpen ? 'geo-results-toggle geo-results-toggle-open' : 'geo-results-toggle'}
-            type="button"
-            aria-controls="geo-explorer-results"
-            aria-expanded={resultsPanelOpen}
-            aria-label={resultsPanelOpen ? 'Sluit inzichten' : 'Open inzichten'}
-            onClick={() => setResultsPanelOpen((open) => !open)}
-          >
-            {resultsPanelOpen ? <ChevronRight aria-hidden="true" /> : <ChevronLeft aria-hidden="true" />}
-            <span>{resultsPanelOpen ? 'Sluit inzichten' : 'Inzichten'}</span>
-          </button>
+          {secondaryResultsContainer ? null : (
+            <button
+              className={resultsPanelOpen ? 'geo-results-toggle geo-results-toggle-open' : 'geo-results-toggle'}
+              type="button"
+              aria-controls="geo-explorer-results"
+              aria-expanded={resultsPanelOpen}
+              aria-label={resultsPanelOpen ? 'Sluit inzichten' : 'Open inzichten'}
+              onClick={() => setResultsPanelOpen((open) => !open)}
+            >
+              {resultsPanelOpen ? <ChevronRight aria-hidden="true" /> : <ChevronLeft aria-hidden="true" />}
+              <span>{resultsPanelOpen ? 'Sluit inzichten' : 'Inzichten'}</span>
+            </button>
+          )}
 
-          <aside
-            id="geo-explorer-results"
-            className={resultsPanelOpen ? 'geo-results-panel geo-results-panel-open' : 'geo-results-panel'}
-            aria-label="Gebiedsanalyse"
-            aria-live="polite"
-            aria-hidden={!resultsPanelOpen}
-          >
+          <SecondaryDisplayTarget container={secondaryResultsContainer}>
+            <aside
+              id={secondaryResultsContainer ? 'geo-secondary-results' : 'geo-explorer-results'}
+              className={secondaryResultsContainer ? 'geo-results-panel geo-results-panel-open geo-results-panel-secondary' : resultsPanelOpen ? 'geo-results-panel geo-results-panel-open' : 'geo-results-panel'}
+              aria-label="Gebiedsanalyse"
+              aria-live="polite"
+              aria-hidden={secondaryResultsContainer ? false : !resultsPanelOpen}
+            >
             <div className="geo-panel-heading">
               <div>
                 <h3>Inzichten</h3>
@@ -3031,7 +3037,8 @@ export function MapWorkspace({
                   : ''}
               </p>
             ) : null}
-          </aside>
+            </aside>
+          </SecondaryDisplayTarget>
         </div>
 
         <footer className="geo-explorer-footer">
diff --git a/frontend/src/components/shell/SecondaryDisplay.test.ts b/frontend/src/components/shell/SecondaryDisplay.test.ts
new file mode 100644
index 00000000..00345855
--- /dev/null
+++ b/frontend/src/components/shell/SecondaryDisplay.test.ts
@@ -0,0 +1,29 @@
+import { describe, expect, it } from 'vitest'
+import { parseSecondaryDisplayGeometry, secondaryDisplayFeatures } from './secondaryDisplayGeometry'
+
+describe('secondary display geometry', () => {
+  it('restores a valid remembered window position', () => {
+    expect(parseSecondaryDisplayGeometry('{"left":1920,"top":0,"width":720,"height":1040}')).toEqual({
+      left: 1920,
+      top: 0,
+      width: 720,
+      height: 1040,
+    })
+  })
+
+  it('rejects malformed state and bounds unsafe dimensions', () => {
+    expect(parseSecondaryDisplayGeometry('not-json')).toBeNull()
+    expect(parseSecondaryDisplayGeometry('{"left":0,"top":0,"width":2,"height":99999}')).toEqual({
+      left: 0,
+      top: 0,
+      width: 420,
+      height: 2160,
+    })
+  })
+
+  it('builds a resizable popup feature string', () => {
+    expect(secondaryDisplayFeatures({ left: 1920, top: 10, width: 700, height: 900 })).toContain(
+      'left=1920,top=10,width=700,height=900,resizable=yes,scrollbars=yes',
+    )
+  })
+})
diff --git a/frontend/src/components/shell/SecondaryDisplay.tsx b/frontend/src/components/shell/SecondaryDisplay.tsx
new file mode 100644
index 00000000..4616bec3
--- /dev/null
+++ b/frontend/src/components/shell/SecondaryDisplay.tsx
@@ -0,0 +1,166 @@
+import { useCallback, useEffect, useRef, useState, type ReactNode } from 'react'
+import { createPortal } from 'react-dom'
+import {
+  parseSecondaryDisplayGeometry,
+  secondaryDisplayFeatures,
+  type SecondaryDisplayGeometry,
+} from './secondaryDisplayGeometry'
+
+const SECONDARY_DISPLAY_NAME = 'geointel-analysis-console'
+const SECONDARY_DISPLAY_GEOMETRY_KEY = 'geointel.secondary-display.geometry.v1'
+
+function defaultGeometry(): SecondaryDisplayGeometry {
+  return {
+    left: window.screenX + Math.max(80, window.outerWidth - 32),
+    top: window.screenY,
+    width: 620,
+    height: Math.max(640, Math.min(1_080, window.outerHeight)),
+  }
+}
+
+function copyDocumentStyles(target: Document): void {
+  document.head.querySelectorAll<HTMLLinkElement | HTMLStyleElement>('link[rel="stylesheet"], style').forEach((node) => {
+    const clone = node.cloneNode(true) as HTMLLinkElement | HTMLStyleElement
+    if (clone instanceof HTMLLinkElement) clone.href = node instanceof HTMLLinkElement ? node.href : ''
+    target.head.append(clone)
+  })
+}
+
+function initialiseSecondaryDocument(target: Window, onClose: () => void): HTMLElement {
+  const targetDocument = target.document
+  targetDocument.title = 'GeoIntel · Analyseconsole'
+  targetDocument.documentElement.lang = document.documentElement.lang || 'nl'
+  targetDocument.head.replaceChildren()
+
+  const viewport = targetDocument.createElement('meta')
+  viewport.name = 'viewport'
+  viewport.content = 'width=device-width, initial-scale=1'
+  targetDocument.head.append(viewport)
+  copyDocumentStyles(targetDocument)
+
+  const shell = targetDocument.createElement('div')
+  shell.className = 'secondary-display-shell'
+
+  const header = targetDocument.createElement('header')
+  header.className = 'secondary-display-header'
+  header.innerHTML = `
+    <div class="secondary-display-brand">
+      <img src="/geointel-icon.svg" alt="" aria-hidden="true" />
+      <span><small>LIVE GEKOPPELD</small><strong>Analyseconsole</strong></span>
+    </div>
+    <div class="secondary-display-status"><i aria-hidden="true"></i><span>Gesynchroniseerd met de kaart</span></div>
+  `
+  const closeButton = targetDocument.createElement('button')
+  closeButton.type = 'button'
+  closeButton.className = 'secondary-display-close'
+  closeButton.textContent = 'Sluit console'
+  closeButton.addEventListener('click', onClose)
+  header.append(closeButton)
+
+  const content = targetDocument.createElement('main')
+  content.className = 'secondary-display-content'
+  content.id = 'secondary-display-content'
+  content.setAttribute('aria-label', 'Live analyse en resultaten')
+
+  shell.append(header, content)
+  targetDocument.body.replaceChildren(shell)
+  targetDocument.body.className = 'secondary-display-body'
+  return content
+}
+
+export function useSecondaryDisplay() {
+  const popupRef = useRef<Window | null>(null)
+  const monitorTimerRef = useRef<number | null>(null)
+  const [container, setContainer] = useState<HTMLElement | null>(null)
+  const [error, setError] = useState<string | null>(null)
+
+  const stopMonitoring = useCallback(() => {
+    if (monitorTimerRef.current !== null) {
+      window.clearInterval(monitorTimerRef.current)
+      monitorTimerRef.current = null
+    }
+  }, [])
+
+  const rememberGeometry = useCallback((popup: Window) => {
+    const geometry: SecondaryDisplayGeometry = {
+      left: popup.screenX,
+      top: popup.screenY,
+      width: popup.outerWidth,
+      height: popup.outerHeight,
+    }
+    try {
+      window.localStorage.setItem(SECONDARY_DISPLAY_GEOMETRY_KEY, JSON.stringify(geometry))
+    } catch {
+      // Window positioning is a convenience; storage restrictions must never
+      // break the live analysis console.
+    }
+  }, [])
+
+  const close = useCallback(() => {
+    const popup = popupRef.current
+    if (popup && !popup.closed) {
+      rememberGeometry(popup)
+      popup.close()
+    }
+    popupRef.current = null
+    setContainer(null)
+    stopMonitoring()
+  }, [rememberGeometry, stopMonitoring])
+
+  const open = useCallback(() => {
+    const existing = popupRef.current
+    if (existing && !existing.closed) {
+      existing.focus()
+      return
+    }
+
+    let saved: SecondaryDisplayGeometry | null = null
+    try {
+      saved = parseSecondaryDisplayGeometry(window.localStorage.getItem(SECONDARY_DISPLAY_GEOMETRY_KEY))
+    } catch {
+      saved = null
+    }
+    const popup = window.open('', SECONDARY_DISPLAY_NAME, secondaryDisplayFeatures(saved ?? defaultGeometry()))
+    if (!popup) {
+      setError('De browser blokkeerde het tweede venster. Sta pop-ups voor GeoIntel toe en probeer opnieuw.')
+      return
+    }
+
+    setError(null)
+    popupRef.current = popup
+    const content = initialiseSecondaryDocument(popup, close)
+    setContainer(content)
+    popup.focus()
+
+    stopMonitoring()
+    monitorTimerRef.current = window.setInterval(() => {
+      const current = popupRef.current
+      if (!current || current.closed) {
+        popupRef.current = null
+        setContainer(null)
+        stopMonitoring()
+        return
+      }
+      rememberGeometry(current)
+    }, 1_000)
+  }, [close, rememberGeometry, stopMonitoring])
+
+  useEffect(() => close, [close])
+
+  return {
+    container,
+    error,
+    isOpen: container !== null,
+    open,
+    close,
+  }
+}
+
+interface SecondaryDisplayTargetProps {
+  container: HTMLElement | null
+  children: ReactNode
+}
+
+export function SecondaryDisplayTarget({ container, children }: SecondaryDisplayTargetProps) {
+  return container ? createPortal(children, container) : children
+}
diff --git a/frontend/src/components/shell/secondaryDisplayGeometry.ts b/frontend/src/components/shell/secondaryDisplayGeometry.ts
new file mode 100644
index 00000000..fb2395de
--- /dev/null
+++ b/frontend/src/components/shell/secondaryDisplayGeometry.ts
@@ -0,0 +1,40 @@
+export interface SecondaryDisplayGeometry {
+  left: number
+  top: number
+  width: number
+  height: number
+}
+
+function boundedInteger(value: unknown, minimum: number, maximum: number): number | null {
+  const parsed = typeof value === 'number' ? value : Number(value)
+  if (!Number.isFinite(parsed)) return null
+  return Math.min(maximum, Math.max(minimum, Math.round(parsed)))
+}
+
+export function parseSecondaryDisplayGeometry(value: string | null): SecondaryDisplayGeometry | null {
+  if (!value) return null
+  try {
+    const parsed = JSON.parse(value) as Partial<SecondaryDisplayGeometry>
+    const left = boundedInteger(parsed.left, -20_000, 20_000)
+    const top = boundedInteger(parsed.top, -20_000, 20_000)
+    const width = boundedInteger(parsed.width, 420, 3_840)
+    const height = boundedInteger(parsed.height, 520, 2_160)
+    return left === null || top === null || width === null || height === null
+      ? null
+      : { left, top, width, height }
+  } catch {
+    return null
+  }
+}
+
+export function secondaryDisplayFeatures(geometry: SecondaryDisplayGeometry): string {
+  return [
+    'popup=yes',
+    `left=${geometry.left}`,
+    `top=${geometry.top}`,
+    `width=${geometry.width}`,
+    `height=${geometry.height}`,
+    'resizable=yes',
+    'scrollbars=yes',
+  ].join(',')
+}
diff --git a/frontend/src/styles/geointel-system.css b/frontend/src/styles/geointel-system.css
index e633d109..bab4864f 100644
--- a/frontend/src/styles/geointel-system.css
+++ b/frontend/src/styles/geointel-system.css
@@ -1990,6 +1990,223 @@ button.overview-command-card { cursor: pointer; }
 .context-health { min-width: auto; border: 0; padding-inline: 0.45rem; background: transparent; box-shadow: none; }
 .context-account { border-color: var(--gi-line); box-shadow: none; }
 
+/* Synchronized dual-display workbench */
+.secondary-display-launch {
+  display: inline-flex;
+  flex: 0 0 auto;
+  gap: 0.45rem;
+  align-items: center;
+  justify-content: center;
+  min-height: 2.35rem;
+  border: 1px solid var(--gi-line);
+  border-radius: 999px;
+  padding: 0.45rem 0.75rem;
+  background: var(--gi-surface);
+  color: var(--gi-ink-700);
+  font: inherit;
+  font-size: var(--gi-text-2xs);
+  font-weight: 750;
+  cursor: pointer;
+  transition: border-color var(--gi-dur-2) var(--gi-ease), background var(--gi-dur-2) var(--gi-ease), color var(--gi-dur-2) var(--gi-ease);
+}
+
+.secondary-display-launch svg {
+  width: 1rem;
+  height: 1rem;
+}
+
+.secondary-display-launch:hover,
+.secondary-display-launch:focus-visible {
+  border-color: var(--gi-brand-400);
+  background: var(--gi-brand-50);
+  color: var(--gi-brand-800);
+}
+
+.secondary-display-launch-active {
+  border-color: var(--gi-brand-600);
+  background: var(--gi-brand-800);
+  color: #fff;
+  box-shadow: 0 0 0 3px color-mix(in srgb, var(--gi-brand-500) 14%, transparent);
+}
+
+.secondary-display-launch-active:hover,
+.secondary-display-launch-active:focus-visible {
+  border-color: var(--gi-brand-700);
+  background: var(--gi-brand-700);
+  color: #fff;
+}
+
+.secondary-display-error {
+  display: flex;
+  gap: 0.55rem;
+  align-items: center;
+  border-bottom: 1px solid #f2c8c2;
+  padding: 0.55rem 0.9rem;
+  background: #fff4f2;
+  color: #8b2f25;
+  font-size: var(--gi-text-xs);
+}
+
+.secondary-display-error svg {
+  width: 1rem;
+  height: 1rem;
+}
+
+.secondary-display-body {
+  min-width: 420px;
+  min-height: 100dvh;
+  margin: 0;
+  overflow: hidden;
+  background: var(--gi-canvas);
+  color: var(--gi-ink-900);
+}
+
+.secondary-display-shell {
+  display: grid;
+  grid-template-rows: auto minmax(0, 1fr);
+  width: 100vw;
+  height: 100dvh;
+  background: var(--gi-canvas);
+}
+
+.secondary-display-header {
+  position: relative;
+  z-index: 20;
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) auto auto;
+  gap: 0.75rem;
+  align-items: center;
+  min-height: 4.5rem;
+  border-bottom: 1px solid var(--gi-line);
+  padding: 0.65rem 0.85rem;
+  background: color-mix(in srgb, var(--gi-surface) 96%, transparent);
+  box-shadow: 0 8px 24px rgba(5, 46, 43, 0.06);
+}
+
+.secondary-display-brand {
+  display: flex;
+  gap: 0.65rem;
+  align-items: center;
+  min-width: 0;
+}
+
+.secondary-display-brand img {
+  width: 2.35rem;
+  height: 2.35rem;
+}
+
+.secondary-display-brand span {
+  display: grid;
+  min-width: 0;
+}
+
+.secondary-display-brand small {
+  color: var(--gi-brand-600);
+  font-size: 0.58rem;
+  font-weight: 800;
+  letter-spacing: 0.09em;
+}
+
+.secondary-display-brand strong {
+  overflow: hidden;
+  font-family: var(--gi-font-display);
+  font-size: 1rem;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.secondary-display-status {
+  display: inline-flex;
+  gap: 0.4rem;
+  align-items: center;
+  border-radius: 999px;
+  padding: 0.45rem 0.65rem;
+  background: var(--gi-brand-50);
+  color: var(--gi-brand-800);
+  font-size: 0.68rem;
+  font-weight: 700;
+}
+
+.secondary-display-status i {
+  width: 0.48rem;
+  height: 0.48rem;
+  border-radius: 50%;
+  background: var(--gi-accent-500);
+  box-shadow: 0 0 0 4px color-mix(in srgb, var(--gi-accent-500) 15%, transparent);
+}
+
+.secondary-display-close {
+  min-height: 2.3rem;
+  border: 1px solid var(--gi-line);
+  border-radius: var(--gi-radius-md);
+  padding: 0.45rem 0.65rem;
+  background: var(--gi-surface);
+  color: var(--gi-ink-700);
+  font: inherit;
+  font-size: 0.68rem;
+  font-weight: 700;
+  cursor: pointer;
+}
+
+.secondary-display-close:hover,
+.secondary-display-close:focus-visible {
+  border-color: var(--gi-brand-400);
+  color: var(--gi-brand-800);
+}
+
+.secondary-display-content {
+  min-width: 0;
+  min-height: 0;
+  overflow: auto;
+  overscroll-behavior: contain;
+  padding: 0.85rem;
+}
+
+.secondary-display-content > .geo-results-panel,
+.secondary-display-content > .geo-results-panel.geo-results-panel-open {
+  position: static !important;
+  inset: auto !important;
+  display: flex;
+  width: 100% !important;
+  max-width: none !important;
+  height: auto !important;
+  max-height: none !important;
+  min-height: calc(100dvh - 6.2rem);
+  overflow: visible !important;
+  border: 1px solid var(--gi-line) !important;
+  border-radius: var(--gi-radius-lg) !important;
+  background: var(--gi-surface) !important;
+  box-shadow: var(--gi-shadow-sm) !important;
+  visibility: visible !important;
+  opacity: 1 !important;
+  pointer-events: auto !important;
+  transform: none !important;
+  animation: none !important;
+}
+
+.secondary-display-content .geo-results-panel > .geo-panel-heading {
+  position: sticky;
+  z-index: 4;
+  top: -0.85rem;
+  border-bottom: 1px solid var(--gi-line);
+  background: color-mix(in srgb, var(--gi-surface) 96%, transparent);
+  backdrop-filter: blur(12px);
+}
+
+.workbench-shell-dual-display .geo-map-stage {
+  border-right-color: transparent;
+}
+
+@media (max-width: 820px) {
+  .secondary-display-launch span { display: none; }
+  .secondary-display-launch { width: 2.5rem; padding-inline: 0; }
+}
+
+@media (max-width: 560px) {
+  .secondary-display-header { grid-template-columns: minmax(0, 1fr) auto; }
+  .secondary-display-status { display: none; }
+}
+
 .geo-explorer-layout,
 .workbench-shell-guest .geo-explorer-layout {
   grid-template-columns: clamp(18rem, 18vw, 22rem) minmax(0, 1fr);
@@ -2092,4 +2309,4 @@ button.overview-command-card { cursor: pointer; }
   .geo-explorer-layout, .workbench-shell-guest .geo-explorer-layout { grid-template-rows: 15rem minmax(25rem, 62vh); }
   .geo-theme-panel { max-height: 15rem; }
   .geo-theme-list { max-height: 7.2rem; min-height: 4.75rem; }
-}
\ No newline at end of file
+}