diff --git a/CHANGELOG.md b/CHANGELOG.md
index 88fa1ce..5b5dff4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,19 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/)
 
 ## [Unreleased]
 
+### Changed — Sprint 13 (SimulationFormPage 3-tab layout)
+
+**Frontend only** (253 vitest passing)
+
+- `frontend/src/components/Tabs.tsx` — Added `disabled?: boolean` per-item: `aria-disabled`, `aria-controls`, native `disabled`, `.tab-underline-disabled` CSS, arrow-key skip logic.
+- `frontend/src/styles/index.css` — New `.tab-underline-disabled` recipe (`text-graphite opacity-50 cursor-not-allowed`).
+- `frontend/src/hooks/useHashTab.ts` — Added optional `validIds?: string[]` for hash fallback to defaultId when hash not in valid set.
+- `frontend/src/pages/SimulationFormPage.tsx` — Full 3-tab refactor: Red Team / SOC / Tâche C2. RT fields in RT tab, SOC fields in SOC tab, `C2TasksPanel` in C2 tab. SOC tab disabled when `status ∉ {review_required, done}`. C2 tab disabled in create mode. Contextual sticky bar hides entirely on C2 tab. SOC-blocked `AlertBanner` removed; tab disabled state replaces it. `safeTab` guards against stale hash from previous navigation.
+- `frontend/src/i18n/fr.json` — Added `simulation.form.tab.{redTeam,soc,c2}` keys.
+- `DESIGN.md` — Documented disabled tab variant and `aria-controls` contract.
+- `frontend/tests/SimulationFormPage.test.tsx` — Rewritten for tab-based layout: SOC-blocked-banner tests removed; tab disabled-state tests, SOC-only field tests, C2 tab panel test, count pill test added.
+- `frontend/tests/components/Tabs.test.tsx` — Added 5 disabled-state tests.
+
 ### Changed — Sprint 12 (EngagementDetailPage 2-tab merge + full FR i18n)
 
 **Frontend only** (245 vitest passing — baseline 233 + 12 new i18n smoke tests)
diff --git a/DESIGN.md b/DESIGN.md
index bb99a46..e60c20e 100644
--- a/DESIGN.md
+++ b/DESIGN.md
@@ -225,7 +225,8 @@ Used inside pages that need content partitioning without a URL change (e.g. Enga
 - **`.tab-underline-active`**: `text-primary border-primary` — 2px primary underline, primary text.
 - **Count pill** (optional, e.g. simulation count): `.tab-count-pill` — `rounded-pill bg-cloud text-graphite text-[11px] px-xs py-0 font-mono`. `rounded-pill` is the documented exception.
 - **Active count pill**: `.tab-count-pill-active` — `bg-primary-soft text-primary`.
-- ARIA: `role="tablist"` on container; `role="tab"` + `aria-selected` on each button.
+- **Disabled variant**: `.tab-underline-disabled` — `text-steel cursor-not-allowed`. Uses the same `text-steel` token as `btn-outline:disabled` for system-wide consistency. Applied when `disabled?: boolean` is set on a `TabItem`. Overrides `.tab-underline` hover. ARIA: `aria-disabled="true"` + native `disabled` attribute. Arrow-key navigation skips disabled items.
+- ARIA: `role="tablist"` on container; `role="tab"` + `aria-selected` + `aria-controls="tabpanel-{id}"` on each button.
 
 ### Data Tables
 
diff --git a/frontend/src/components/Tabs.tsx b/frontend/src/components/Tabs.tsx
index 55d70f8..6cac399 100644
--- a/frontend/src/components/Tabs.tsx
+++ b/frontend/src/components/Tabs.tsx
@@ -4,6 +4,7 @@ interface TabItem {
   id: string;
   label: string;
   count?: number;
+  disabled?: boolean;
 }
 
 interface TabsProps {
@@ -13,13 +14,23 @@ interface TabsProps {
 }
 
 export function Tabs({ items, activeId, onChange }: TabsProps): JSX.Element {
+  function nextEnabled(from: number, direction: 1 | -1): string {
+    const len = items.length;
+    let i = (from + direction + len) % len;
+    while (i !== from) {
+      if (!items[i].disabled) return items[i].id;
+      i = (i + direction + len) % len;
+    }
+    return items[from].id;
+  }
+
   function handleKeyDown(e: KeyboardEvent<HTMLButtonElement>, index: number) {
     if (e.key === 'ArrowRight') {
       e.preventDefault();
-      onChange(items[(index + 1) % items.length].id);
+      onChange(nextEnabled(index, 1));
     } else if (e.key === 'ArrowLeft') {
       e.preventDefault();
-      onChange(items[(index - 1 + items.length) % items.length].id);
+      onChange(nextEnabled(index, -1));
     }
   }
 
@@ -30,6 +41,7 @@ export function Tabs({ items, activeId, onChange }: TabsProps): JSX.Element {
     >
       {items.map((item, index) => {
         const isActive = item.id === activeId;
+        const isDisabled = item.disabled ?? false;
         return (
           <button
             key={item.id}
@@ -37,10 +49,12 @@ export function Tabs({ items, activeId, onChange }: TabsProps): JSX.Element {
             role="tab"
             aria-selected={isActive}
             aria-controls={`tabpanel-${item.id}`}
+            aria-disabled={isDisabled || undefined}
+            disabled={isDisabled}
             type="button"
-            onClick={() => onChange(item.id)}
+            onClick={() => { if (!isDisabled) onChange(item.id); }}
             onKeyDown={(e) => handleKeyDown(e, index)}
-            className={`tab-underline${isActive ? ' tab-underline-active' : ''} pb-xs`}
+            className={`tab-underline${isActive ? ' tab-underline-active' : ''}${isDisabled ? ' tab-underline-disabled' : ''} pb-xs`}
           >
             {item.label}
             {item.count !== undefined ? (
diff --git a/frontend/src/hooks/useHashTab.ts b/frontend/src/hooks/useHashTab.ts
index 106b161..ba69e17 100644
--- a/frontend/src/hooks/useHashTab.ts
+++ b/frontend/src/hooks/useHashTab.ts
@@ -1,20 +1,22 @@
 import { useCallback, useEffect, useState } from 'react';
 
-function readHash(defaultId: string): string {
+function readHash(defaultId: string, validIds?: string[]): string {
   const hash = window.location.hash.slice(1); // strip leading '#'
-  return hash || defaultId;
+  if (!hash) return defaultId;
+  if (validIds && !validIds.includes(hash)) return defaultId;
+  return hash;
 }
 
-export function useHashTab(defaultId: string): [string, (id: string) => void] {
-  const [activeId, setActiveId] = useState<string>(() => readHash(defaultId));
+export function useHashTab(defaultId: string, validIds?: string[]): [string, (id: string) => void] {
+  const [activeId, setActiveId] = useState<string>(() => readHash(defaultId, validIds));
 
   useEffect(() => {
     function onHashChange() {
-      setActiveId(readHash(defaultId));
+      setActiveId(readHash(defaultId, validIds));
     }
     window.addEventListener('hashchange', onHashChange);
     return () => window.removeEventListener('hashchange', onHashChange);
-  }, [defaultId]);
+  }, [defaultId, validIds]);
 
   const navigate = useCallback((id: string) => {
     // replaceState: no history entry (Back button unaffected), no anchor-jump scroll
diff --git a/frontend/src/i18n/fr.json b/frontend/src/i18n/fr.json
index ccb01a0..6b989b7 100644
--- a/frontend/src/i18n/fr.json
+++ b/frontend/src/i18n/fr.json
@@ -204,7 +204,12 @@
         "transition": "Transition échouée",
         "load": "Impossible de charger la simulation"
       },
-      "loading": "Chargement de la simulation…"
+      "loading": "Chargement de la simulation…",
+      "tab": {
+        "redTeam": "Red Team",
+        "soc": "SOC",
+        "c2": "Tâche C2"
+      }
     },
     "list": {
       "col": {
diff --git a/frontend/src/pages/SimulationFormPage.tsx b/frontend/src/pages/SimulationFormPage.tsx
index 8657ece..c2e1760 100644
--- a/frontend/src/pages/SimulationFormPage.tsx
+++ b/frontend/src/pages/SimulationFormPage.tsx
@@ -6,6 +6,7 @@ import { extractApiError } from '@/api/client';
 import type { SimulationPatchInput } from '@/api/types';
 import { useAuth } from '@/hooks/useAuth';
 import { useToast } from '@/hooks/useToast';
+import { useHashTab } from '@/hooks/useHashTab';
 import {
   useCreateSimulation,
   useDeleteSimulation,
@@ -25,6 +26,9 @@ import { ImportC2HistoryModal } from '@/components/ImportC2HistoryModal';
 import { C2TasksPanel } from '@/components/C2TasksPanel';
 import { AlertBanner } from '@/components/AlertBanner';
 import { BackLink } from '@/components/BackLink';
+import { Tabs } from '@/components/Tabs';
+
+type TabId = 'red-team' | 'soc' | 'c2';
 
 interface RedteamFormState {
   name: string;
@@ -79,9 +83,7 @@ export function SimulationFormPage(): JSX.Element {
   const c2TasksQuery = useC2Tasks(!isNew ? simulationId : undefined, {
     enabled: !isNew && canEditRT,
   });
-  const hasTasks = (c2TasksQuery.data?.tasks?.length ?? 0) > 0;
-  // Show panel when: has C2 config (so Execute button is visible) OR already has tasks
-  const showTasksPanel = !isNew && canEditRT && (hasC2Config || hasTasks);
+  const c2TaskCount = c2TasksQuery.data?.tasks?.length ?? 0;
 
   const detail = useSimulation(isNew ? undefined : simulationId);
   const createMutation = useCreateSimulation(engagementId ?? 0);
@@ -97,6 +99,26 @@ export function SimulationFormPage(): JSX.Element {
   const [showC2Modal, setShowC2Modal] = useState(false);
   const [showImportModal, setShowImportModal] = useState(false);
 
+  // All hooks must be called unconditionally before any early returns.
+  const [activeTab, setActiveTab] = useHashTab('red-team');
+
+  // Compute disabled flags early using detail.data (may be undefined during load — that's fine).
+  const loadedStatus = detail.data?.status;
+  const earlySOCDisabled = isNew || (loadedStatus !== 'review_required' && loadedStatus !== 'done');
+  const earlyC2Disabled = isNew || isSoc;
+  const earlyHash = activeTab;
+  const earlySafeTab =
+    (earlyHash === 'soc' && earlySOCDisabled) || (earlyHash === 'c2' && earlyC2Disabled)
+      ? 'red-team'
+      : earlyHash;
+
+  // Sync window.location.hash when the active hash points to a disabled tab
+  useEffect(() => {
+    if (earlySafeTab !== activeTab) {
+      setActiveTab(earlySafeTab);
+    }
+  }, [earlySafeTab, activeTab, setActiveTab]);
+
   useEffect(() => {
     if (!isNew && detail.data) {
       const s = detail.data;
@@ -130,12 +152,8 @@ export function SimulationFormPage(): JSX.Element {
   const simulation = detail.data;
   const status = simulation?.status;
 
-  // US-18: Done = fully read-only, Reopen only
   const isDone = status === 'done';
-
   const socCanEdit = isSoc && (status === 'review_required' || status === 'done');
-  const socBlocked = isSoc && (status === 'pending' || status === 'in_progress');
-
   const canSaveSoc = !isDone && (socCanEdit || canEditEngagements);
   const rtDisabled = !canEditRT || isDone;
   const socDisabled = isDone || (!canEditEngagements && !socCanEdit);
@@ -146,6 +164,11 @@ export function SimulationFormPage(): JSX.Element {
     !isDone && (canEditEngagements || isSoc) && status === 'review_required';
   const showReopen = isDone && (isAdmin || isRedteam || isSoc);
 
+  // Post-load versions (same logic, now with confirmed status)
+  const socTabDisabled = earlySOCDisabled;
+  const c2TabDisabled = earlyC2Disabled;
+  const safeTab = earlySafeTab;
+
   const onSubmitNew = async (e: FormEvent) => {
     e.preventDefault();
     setNameError(null);
@@ -236,9 +259,27 @@ export function SimulationFormPage(): JSX.Element {
     }
   };
 
+  const submitting =
+    updateMutation.isPending || transitionMutation.isPending || deleteMutation.isPending;
+
+  const tabItems = [
+    { id: 'red-team' as TabId, label: t('simulation.form.tab.redTeam') },
+    {
+      id: 'soc' as TabId,
+      label: t('simulation.form.tab.soc'),
+      disabled: socTabDisabled,
+    },
+    {
+      id: 'c2' as TabId,
+      label: t('simulation.form.tab.c2'),
+      count: !isNew && c2TaskCount > 0 ? c2TaskCount : undefined,
+      disabled: c2TabDisabled,
+    },
+  ];
+
   // New simulation form
   if (isNew) {
-    const submitting = createMutation.isPending;
+    const creating = createMutation.isPending;
     return (
       <div className="flex flex-col gap-xl max-w-2xl">
         <header>
@@ -246,6 +287,8 @@ export function SimulationFormPage(): JSX.Element {
           <h1 className="text-[32px] font-medium leading-none mt-sm">{t('simulation.form.title.new')}</h1>
         </header>
 
+        <Tabs items={tabItems} activeId="red-team" onChange={() => {}} />
+
         <form onSubmit={onSubmitNew} noValidate className="card-product flex flex-col gap-md">
           <FormField label={t('simulation.form.field.name')} htmlFor="sim-name" required error={nameError}>
             <TextInput
@@ -257,26 +300,34 @@ export function SimulationFormPage(): JSX.Element {
             />
           </FormField>
 
+          <div className="flex flex-col gap-xs">
+            <span className="text-[14px] font-medium text-ink">{t('simulation.form.field.mitre')}</span>
+            <MitreTechniquesField
+              value={[]}
+              tactics={[]}
+              simulationId={0}
+              engagementId={engagementId ?? 0}
+              disabled
+            />
+          </div>
+
           {submitError ? (
             <div role="alert" className="text-[14px] text-bloom-deep">{submitError}</div>
           ) : null}
-
-          <div className="flex items-center gap-md pt-sm">
-            <button type="submit" className="btn-primary" disabled={submitting} data-testid="create-sim-btn">
-              {submitting ? t('simulation.form.btn.creating') : t('simulation.form.btn.create')}
-            </button>
-            <Link to={`/engagements/${engagementId}`} className="btn-outline-ink">
-              {t('simulation.form.btn.cancel')}
-            </Link>
-          </div>
         </form>
+
+        <div className="sticky bottom-0 bg-canvas border-t border-hairline flex items-center gap-md flex-wrap py-md">
+          <button type="button" className="btn-primary" disabled={creating} data-testid="create-sim-btn" onClick={onSubmitNew}>
+            {creating ? t('simulation.form.btn.creating') : t('simulation.form.btn.create')}
+          </button>
+          <Link to={`/engagements/${engagementId}`} className="btn-outline-ink">
+            {t('simulation.form.btn.cancel')}
+          </Link>
+        </div>
       </div>
     );
   }
 
-  const submitting =
-    updateMutation.isPending || transitionMutation.isPending || deleteMutation.isPending;
-
   return (
     <div className="flex flex-col gap-xl">
       <header className="flex items-start justify-between gap-md">
@@ -297,256 +348,257 @@ export function SimulationFormPage(): JSX.Element {
         </div>
       </header>
 
-      {/* Done banner */}
+      {/* Done banner — above tabs, global status info */}
       {isDone && (
         <AlertBanner variant="success">
           {t('simulation.form.banner.done')}
         </AlertBanner>
       )}
 
-      {/* SOC banner */}
-      {socBlocked && (
-        <div data-testid="soc-blocked-banner">
-          <AlertBanner variant="warn">
-            {t('simulation.form.banner.socNotReady')}
-          </AlertBanner>
-        </div>
-      )}
+      <Tabs items={tabItems} activeId={safeTab} onChange={setActiveTab} />
 
-      {/* 2-column grid: RT+tasks left, SOC right. Stacks vertically below lg. */}
-      <div className="grid gap-xl lg:grid-cols-2 items-start">
-        {/* Left column: RT card + C2 tasks panel */}
-        <div className="flex flex-col gap-xl">
-        {/* Red Team card */}
-        <form
-          id="rt-form"
-          onSubmit={canEditRT && !isDone ? onSaveRT : (e) => e.preventDefault()}
-          noValidate
-          className="card-product flex flex-col gap-md"
-        >
-          <h2 className="text-[20px] font-medium text-ink">{t('simulation.form.header.redTeam')}</h2>
+      <div
+        role="tabpanel"
+        id={`tabpanel-${safeTab}`}
+        aria-labelledby={`tab-${safeTab}`}
+      >
+        {/* ── Red Team tab ──────────────────────────────────────── */}
+        {safeTab === 'red-team' && (
+          <form
+            id="rt-form"
+            onSubmit={canEditRT && !isDone ? onSaveRT : (e) => e.preventDefault()}
+            noValidate
+            className="card-product flex flex-col gap-md"
+          >
+            <FormField label={t('simulation.form.field.name')} htmlFor="sim-name" required error={nameError}>
+              <TextInput
+                id="sim-name"
+                name="name"
+                value={rt.name}
+                onChange={(e) => setRt({ ...rt, name: e.target.value })}
+                disabled={rtDisabled}
+                required
+              />
+            </FormField>
 
-          <FormField label={t('simulation.form.field.name')} htmlFor="sim-name" required error={nameError}>
-            <TextInput
-              id="sim-name"
-              name="name"
-              value={rt.name}
-              onChange={(e) => setRt({ ...rt, name: e.target.value })}
-              disabled={rtDisabled}
-              required
-            />
-          </FormField>
-
-          <div className="flex flex-col gap-xs">
-            <span className="text-[14px] font-medium text-ink">{t('simulation.form.field.mitre')}</span>
-            <MitreTechniquesField
-              value={simulation?.techniques ?? []}
-              tactics={simulation?.tactics ?? []}
-              simulationId={simulationId as number}
-              engagementId={engagementId as number}
-              disabled={rtDisabled}
-            />
-          </div>
-
-          <FormField label={t('simulation.form.field.description')} htmlFor="sim-description">
-            <TextArea
-              id="sim-description"
-              name="description"
-              value={rt.description}
-              onChange={(e) => setRt({ ...rt, description: e.target.value })}
-              disabled={rtDisabled}
-            />
-          </FormField>
-
-          <FormField label={t('simulation.form.field.commands')} htmlFor="sim-commands" hint={t('simulation.form.field.commandsHint')}>
-            <TextArea
-              id="sim-commands"
-              name="commands"
-              value={rt.commands}
-              onChange={(e) => setRt({ ...rt, commands: e.target.value })}
-              disabled={rtDisabled}
-              className="min-h-[160px] font-mono text-[14px]"
-            />
-          </FormField>
-
-          <FormField label={t('simulation.form.field.prerequisites')} htmlFor="sim-prerequisites">
-            <TextArea
-              id="sim-prerequisites"
-              name="prerequisites"
-              value={rt.prerequisites}
-              onChange={(e) => setRt({ ...rt, prerequisites: e.target.value })}
-              disabled={rtDisabled}
-            />
-          </FormField>
-
-          <FormField label={t('simulation.form.field.executedAt')} htmlFor="sim-executed-at">
-            <TextInput
-              id="sim-executed-at"
-              type="datetime-local"
-              name="executed_at"
-              value={rt.executed_at}
-              onChange={(e) => setRt({ ...rt, executed_at: e.target.value })}
-              disabled={rtDisabled}
-            />
-          </FormField>
-
-          <FormField label={t('simulation.form.field.executionResult')} htmlFor="sim-exec-result">
-            <TextArea
-              id="sim-exec-result"
-              name="execution_result"
-              value={rt.execution_result}
-              onChange={(e) => setRt({ ...rt, execution_result: e.target.value })}
-              disabled={rtDisabled}
-              rows={5}
-            />
-          </FormField>
-
-          {!isDone && canEditRT && hasC2Config && (
-            <div className="pt-xs flex items-center gap-md flex-wrap">
-              <button
-                type="button"
-                data-testid="c2-execute-btn"
-                className="btn-outline"
-                onClick={() => setShowC2Modal(true)}
-              >
-                {t('simulation.form.btn.executeC2')}
-              </button>
-              <button
-                type="button"
-                data-testid="c2-import-trigger-btn"
-                className="btn-outline"
-                onClick={() => setShowImportModal(true)}
-              >
-                {t('simulation.form.btn.importC2History')}
-              </button>
+            <div className="flex flex-col gap-xs">
+              <span className="text-[14px] font-medium text-ink">{t('simulation.form.field.mitre')}</span>
+              <MitreTechniquesField
+                value={simulation?.techniques ?? []}
+                tactics={simulation?.tactics ?? []}
+                simulationId={simulationId as number}
+                engagementId={engagementId as number}
+                disabled={rtDisabled}
+              />
             </div>
-          )}
-        </form>
 
-        {/* C2 tasks panel — under RT card, same left column */}
-        {showTasksPanel && simulationId && (
+            <FormField label={t('simulation.form.field.description')} htmlFor="sim-description">
+              <TextArea
+                id="sim-description"
+                name="description"
+                value={rt.description}
+                onChange={(e) => setRt({ ...rt, description: e.target.value })}
+                disabled={rtDisabled}
+              />
+            </FormField>
+
+            <FormField label={t('simulation.form.field.commands')} htmlFor="sim-commands" hint={t('simulation.form.field.commandsHint')}>
+              <TextArea
+                id="sim-commands"
+                name="commands"
+                value={rt.commands}
+                onChange={(e) => setRt({ ...rt, commands: e.target.value })}
+                disabled={rtDisabled}
+                className="min-h-[160px] font-mono text-[14px]"
+              />
+            </FormField>
+
+            <FormField label={t('simulation.form.field.prerequisites')} htmlFor="sim-prerequisites">
+              <TextArea
+                id="sim-prerequisites"
+                name="prerequisites"
+                value={rt.prerequisites}
+                onChange={(e) => setRt({ ...rt, prerequisites: e.target.value })}
+                disabled={rtDisabled}
+              />
+            </FormField>
+
+            <FormField label={t('simulation.form.field.executedAt')} htmlFor="sim-executed-at">
+              <TextInput
+                id="sim-executed-at"
+                type="datetime-local"
+                name="executed_at"
+                value={rt.executed_at}
+                onChange={(e) => setRt({ ...rt, executed_at: e.target.value })}
+                disabled={rtDisabled}
+              />
+            </FormField>
+
+            <FormField label={t('simulation.form.field.executionResult')} htmlFor="sim-exec-result">
+              <TextArea
+                id="sim-exec-result"
+                name="execution_result"
+                value={rt.execution_result}
+                onChange={(e) => setRt({ ...rt, execution_result: e.target.value })}
+                disabled={rtDisabled}
+                rows={5}
+              />
+            </FormField>
+
+            {!isDone && canEditRT && hasC2Config && (
+              <div className="pt-xs flex items-center gap-md flex-wrap">
+                <button
+                  type="button"
+                  data-testid="c2-execute-btn"
+                  className="btn-outline"
+                  onClick={() => setShowC2Modal(true)}
+                >
+                  {t('simulation.form.btn.executeC2')}
+                </button>
+                <button
+                  type="button"
+                  data-testid="c2-import-trigger-btn"
+                  className="btn-outline"
+                  onClick={() => setShowImportModal(true)}
+                >
+                  {t('simulation.form.btn.importC2History')}
+                </button>
+              </div>
+            )}
+          </form>
+        )}
+
+        {/* ── SOC tab ───────────────────────────────────────────── */}
+        {safeTab === 'soc' && (
+          <form
+            id="soc-form"
+            onSubmit={canSaveSoc ? onSaveSOC : (e) => e.preventDefault()}
+            noValidate
+            className="card-product flex flex-col gap-md"
+          >
+            <FormField label={t('simulation.form.field.logSource')} htmlFor="sim-log-source">
+              <TextInput
+                id="sim-log-source"
+                name="log_source"
+                value={soc.log_source}
+                onChange={(e) => setSoc({ ...soc, log_source: e.target.value })}
+                disabled={socDisabled}
+              />
+            </FormField>
+
+            <FormField label={t('simulation.form.field.logs')} htmlFor="sim-logs">
+              <TextArea
+                id="sim-logs"
+                name="logs"
+                value={soc.logs}
+                onChange={(e) => setSoc({ ...soc, logs: e.target.value })}
+                disabled={socDisabled}
+              />
+            </FormField>
+
+            <FormField label={t('simulation.form.field.socComment')} htmlFor="sim-soc-comment">
+              <TextArea
+                id="sim-soc-comment"
+                name="soc_comment"
+                value={soc.soc_comment}
+                onChange={(e) => setSoc({ ...soc, soc_comment: e.target.value })}
+                disabled={socDisabled}
+              />
+            </FormField>
+
+            <FormField label={t('simulation.form.field.incidentNumber')} htmlFor="sim-incident">
+              <TextInput
+                id="sim-incident"
+                name="incident_number"
+                value={soc.incident_number}
+                onChange={(e) => setSoc({ ...soc, incident_number: e.target.value })}
+                disabled={socDisabled}
+              />
+            </FormField>
+          </form>
+        )}
+
+        {/* ── C2 tab ────────────────────────────────────────────── */}
+        {safeTab === 'c2' && simulationId && (
           <C2TasksPanel simulationId={simulationId} />
         )}
-        </div>{/* end left column */}
-
-        {/* SOC card */}
-        <form
-          id="soc-form"
-          onSubmit={canSaveSoc ? onSaveSOC : (e) => e.preventDefault()}
-          noValidate
-          className="card-product flex flex-col gap-md"
-        >
-          <h2 className="text-[20px] font-medium text-ink">{t('simulation.form.header.soc')}</h2>
-
-          <FormField label={t('simulation.form.field.logSource')} htmlFor="sim-log-source">
-            <TextInput
-              id="sim-log-source"
-              name="log_source"
-              value={soc.log_source}
-              onChange={(e) => setSoc({ ...soc, log_source: e.target.value })}
-              disabled={socDisabled}
-            />
-          </FormField>
-
-          <FormField label={t('simulation.form.field.logs')} htmlFor="sim-logs">
-            <TextArea
-              id="sim-logs"
-              name="logs"
-              value={soc.logs}
-              onChange={(e) => setSoc({ ...soc, logs: e.target.value })}
-              disabled={socDisabled}
-            />
-          </FormField>
-
-          <FormField label={t('simulation.form.field.socComment')} htmlFor="sim-soc-comment">
-            <TextArea
-              id="sim-soc-comment"
-              name="soc_comment"
-              value={soc.soc_comment}
-              onChange={(e) => setSoc({ ...soc, soc_comment: e.target.value })}
-              disabled={socDisabled}
-            />
-          </FormField>
-
-          <FormField label={t('simulation.form.field.incidentNumber')} htmlFor="sim-incident">
-            <TextInput
-              id="sim-incident"
-              name="incident_number"
-              value={soc.incident_number}
-              onChange={(e) => setSoc({ ...soc, incident_number: e.target.value })}
-              disabled={socDisabled}
-            />
-          </FormField>
-        </form>
       </div>
 
       {submitError ? (
         <div role="alert" className="text-[14px] text-bloom-deep">{submitError}</div>
       ) : null}
 
-      {/* Unified sticky action bar */}
-      <div className="sticky bottom-0 bg-canvas border-t border-hairline flex items-center gap-md flex-wrap py-md">
-        {/* Done state: Reopen only */}
-        {showReopen && (
-          <button
-            type="button"
-            className="btn-outline"
-            onClick={onReopen}
-            disabled={transitionMutation.isPending}
-            data-testid="reopen-btn"
-          >
-            <RotateCcw size={14} aria-hidden />
-            {t('simulation.form.btn.reopen')}
-          </button>
-        )}
+      {/* Contextual sticky bar — not rendered at all for C2 tab */}
+      {safeTab !== 'c2' && (
+        <div className="sticky bottom-0 bg-canvas border-t border-hairline flex items-center gap-md flex-wrap py-md">
+          {safeTab === 'red-team' && (
+            <>
+              {!isDone && canEditRT && (
+                <button type="submit" form="rt-form" className="btn-primary" disabled={submitting}>
+                  <Save size={14} aria-hidden />
+                  {updateMutation.isPending ? t('simulation.form.btn.saving') : t('simulation.form.btn.save')}
+                </button>
+              )}
+              {showMarkReview && (
+                <button
+                  type="button"
+                  className="btn-outline"
+                  onClick={onMarkReview}
+                  disabled={transitionMutation.isPending}
+                  data-testid="mark-review-btn"
+                >
+                  {t('simulation.form.btn.markReview')}
+                </button>
+              )}
+              {!isDone && canEditEngagements && simulationId && (
+                <button
+                  type="button"
+                  className="btn-text-link text-bloom-deep ml-auto"
+                  onClick={() => setShowDeleteConfirm(true)}
+                  disabled={submitting}
+                  data-testid="delete-btn"
+                >
+                  {t('simulation.form.btn.delete')}
+                </button>
+              )}
+            </>
+          )}
 
-        {/* Normal state buttons */}
-        {!isDone && canEditRT && (
-          <button type="submit" form="rt-form" className="btn-primary" disabled={submitting}>
-            <Save size={14} aria-hidden />
-            {updateMutation.isPending ? t('simulation.form.btn.saving') : t('simulation.form.btn.save')}
-          </button>
-        )}
-        {!isDone && canSaveSoc && (
-          <button type="submit" form="soc-form" className="btn-primary" disabled={submitting}>
-            <Save size={14} aria-hidden />
-            {updateMutation.isPending ? t('simulation.form.btn.saving') : t('simulation.form.btn.saveSoc')}
-          </button>
-        )}
-        {showMarkReview && (
-          <button
-            type="button"
-            className="btn-outline"
-            onClick={onMarkReview}
-            disabled={transitionMutation.isPending}
-            data-testid="mark-review-btn"
-          >
-            {t('simulation.form.btn.markReview')}
-          </button>
-        )}
-        {showClose && (
-          <button
-            type="button"
-            className="btn-outline"
-            onClick={onClose}
-            disabled={transitionMutation.isPending}
-            data-testid="close-btn"
-          >
-            {t('simulation.form.btn.close')}
-          </button>
-        )}
-        {!isDone && canEditEngagements && simulationId && (
-          <button
-            type="button"
-            className="btn-text-link text-bloom-deep ml-auto"
-            onClick={() => setShowDeleteConfirm(true)}
-            disabled={submitting}
-            data-testid="delete-btn"
-          >
-            {t('simulation.form.btn.delete')}
-          </button>
-        )}
-      </div>
+          {safeTab === 'soc' && (
+            <>
+              {!isDone && canSaveSoc && (
+                <button type="submit" form="soc-form" className="btn-primary" disabled={submitting}>
+                  <Save size={14} aria-hidden />
+                  {updateMutation.isPending ? t('simulation.form.btn.saving') : t('simulation.form.btn.saveSoc')}
+                </button>
+              )}
+              {showClose && (
+                <button
+                  type="button"
+                  className="btn-outline"
+                  onClick={onClose}
+                  disabled={transitionMutation.isPending}
+                  data-testid="close-btn"
+                >
+                  {t('simulation.form.btn.close')}
+                </button>
+              )}
+              {showReopen && (
+                <button
+                  type="button"
+                  className="btn-outline"
+                  onClick={onReopen}
+                  disabled={transitionMutation.isPending}
+                  data-testid="reopen-btn"
+                >
+                  <RotateCcw size={14} aria-hidden />
+                  {t('simulation.form.btn.reopen')}
+                </button>
+              )}
+            </>
+          )}
+        </div>
+      )}
 
       {showDeleteConfirm && (
         <ConfirmDialog
diff --git a/frontend/src/styles/index.css b/frontend/src/styles/index.css
index c6116e9..72d3d24 100644
--- a/frontend/src/styles/index.css
+++ b/frontend/src/styles/index.css
@@ -162,6 +162,10 @@
   .tab-count-pill-active {
     @apply bg-primary-soft text-primary;
   }
+  /* Disabled variant — consistent with btn-outline:disabled; overrides hover from .tab-underline */
+  .tab-underline-disabled {
+    @apply text-steel cursor-not-allowed;
+  }
 
   /* ─── Inline alert banners (L2) ─────────────────────────────────────── */
   .alert-error {
diff --git a/frontend/tests/SimulationFormPage.test.tsx b/frontend/tests/SimulationFormPage.test.tsx
index 62c9db0..70e00e3 100644
--- a/frontend/tests/SimulationFormPage.test.tsx
+++ b/frontend/tests/SimulationFormPage.test.tsx
@@ -1,5 +1,7 @@
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
-import { screen, waitFor } from '@testing-library/react';
+import { screen, waitFor, fireEvent } from '@testing-library/react';
+// Reset hash between tests so useHashTab doesn't bleed state
+afterEach(() => { history.replaceState(null, '', '/'); });
 import { Route, Routes } from 'react-router-dom';
 import MockAdapter from 'axios-mock-adapter';
 import { apiClient } from '@/api/client';
@@ -43,7 +45,6 @@ vi.mock('@/hooks/useAuth', () => ({
   }),
 }));
 
-// Wrap the page in a Route so useParams gets eid and sid
 function EditPage() {
   return (
     <Routes>
@@ -68,6 +69,7 @@ describe('SimulationFormPage — redteam mode (edit existing)', () => {
     mock = new MockAdapter(apiClient);
     mock.onGet('/simulations/7').reply(200, BASE_SIM);
     mock.onGet('/engagements/42/c2-config').reply(404);
+    mock.onGet('/simulations/7/c2/tasks').reply(200, { tasks: [] });
   });
 
   afterEach(() => {
@@ -126,12 +128,16 @@ describe('SimulationFormPage — redteam mode (edit existing)', () => {
     });
   });
 
-  it('shows "Close" button when status is review_required', async () => {
+  it('shows "Close" button on SOC tab when status is review_required', async () => {
     mock.onGet('/simulations/7').reply(200, { ...BASE_SIM, status: 'review_required' });
     renderWithProviders(<EditPage />, {
       routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
     });
 
+    // Switch to SOC tab to see Close button
+    await waitFor(() => expect(screen.getByRole('tab', { name: /SOC/i })).not.toBeDisabled());
+    fireEvent.click(screen.getByRole('tab', { name: /SOC/i }));
+
     await waitFor(() => {
       expect(screen.getByTestId('close-btn')).toBeInTheDocument();
     });
@@ -148,41 +154,168 @@ describe('SimulationFormPage — redteam mode (edit existing)', () => {
   });
 });
 
-describe('SimulationFormPage — SOC role + pending (blocked)', () => {
+describe('SimulationFormPage — tabs', () => {
   let mock: MockAdapter;
 
   beforeEach(() => {
-    mockRole = 'soc';
+    mockRole = 'redteam';
     mock = new MockAdapter(apiClient);
     mock.onGet('/simulations/7').reply(200, BASE_SIM);
-    // SOC role: useC2Config disabled (canEditRT=false), so no request expected — stub anyway
     mock.onGet('/engagements/42/c2-config').reply(404);
+    mock.onGet('/simulations/7/c2/tasks').reply(200, { tasks: [] });
   });
 
   afterEach(() => {
     mock.restore();
   });
 
-  it('shows the SOC blocked banner', async () => {
+  it('renders 3 tabs: Red Team, SOC, Tâche C2', async () => {
+    renderWithProviders(<EditPage />, {
+      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
+    });
+
+    await waitFor(() => expect(screen.getByLabelText(/^Nom/i)).not.toBeDisabled());
+
+    expect(screen.getByRole('tab', { name: /Red Team/i })).toBeInTheDocument();
+    expect(screen.getByRole('tab', { name: /SOC/i })).toBeInTheDocument();
+    expect(screen.getByRole('tab', { name: /Tâche C2/i })).toBeInTheDocument();
+  });
+
+  it('SOC tab is disabled when status is pending', async () => {
+    renderWithProviders(<EditPage />, {
+      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
+    });
+
+    await waitFor(() => expect(screen.getByLabelText(/^Nom/i)).not.toBeDisabled());
+
+    const socTab = screen.getByRole('tab', { name: /SOC/i });
+    expect(socTab).toBeDisabled();
+  });
+
+  it('SOC tab is enabled when status is review_required', async () => {
+    mock.onGet('/simulations/7').reply(200, { ...BASE_SIM, status: 'review_required' });
     renderWithProviders(<EditPage />, {
       routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
     });
 
     await waitFor(() => {
-      expect(screen.getByTestId('soc-blocked-banner')).toBeInTheDocument();
+      const socTab = screen.getByRole('tab', { name: /SOC/i });
+      expect(socTab).not.toBeDisabled();
     });
   });
 
-  it('SOC inputs are disabled when status is pending', async () => {
+  it('SOC tab is enabled when status is done', async () => {
+    mock.onGet('/simulations/7').reply(200, { ...BASE_SIM, status: 'done' });
     renderWithProviders(<EditPage />, {
       routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
     });
 
     await waitFor(() => {
-      expect(screen.getByLabelText(/^Source de log/i)).toBeDisabled();
+      const socTab = screen.getByRole('tab', { name: /SOC/i });
+      expect(socTab).not.toBeDisabled();
+    });
+  });
+
+  it('C2 tab is enabled for redteam in edit mode', async () => {
+    renderWithProviders(<EditPage />, {
+      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
     });
 
-    expect(screen.getByLabelText(/^Numéro d'incident/i)).toBeDisabled();
+    await waitFor(() => expect(screen.getByLabelText(/^Nom/i)).not.toBeDisabled());
+
+    expect(screen.getByRole('tab', { name: /Tâche C2/i })).not.toBeDisabled();
+  });
+
+  it('C2 tab is disabled for SOC role (backend 403 on /c2/tasks)', async () => {
+    mockRole = 'soc';
+    mock.onGet('/simulations/7').reply(200, { ...BASE_SIM, status: 'review_required' });
+    renderWithProviders(<EditPage />, {
+      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
+    });
+
+    await waitFor(() => expect(screen.getByRole('tab', { name: /Tâche C2/i })).toBeDisabled());
+  });
+
+  it('SOC fields are visible after switching to SOC tab', async () => {
+    mock.onGet('/simulations/7').reply(200, { ...BASE_SIM, status: 'review_required' });
+    renderWithProviders(<EditPage />, {
+      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
+    });
+
+    await waitFor(() => expect(screen.getByRole('tab', { name: /SOC/i })).not.toBeDisabled());
+    fireEvent.click(screen.getByRole('tab', { name: /SOC/i }));
+
+    await waitFor(() => {
+      expect(screen.getByLabelText(/^Source de log/i)).toBeInTheDocument();
+    });
+    expect(screen.getByLabelText(/^Numéro d'incident/i)).toBeInTheDocument();
+  });
+
+  it('sticky bar is not rendered on C2 tab', async () => {
+    mock.onGet('/simulations/7/c2/tasks').reply(200, { tasks: [] });
+    renderWithProviders(<EditPage />, {
+      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
+    });
+
+    await waitFor(() => expect(screen.getByLabelText(/^Nom/i)).not.toBeDisabled());
+    fireEvent.click(screen.getByRole('tab', { name: /Tâche C2/i }));
+
+    await waitFor(() => expect(screen.getByTestId('c2-tasks-panel')).toBeInTheDocument());
+    // Save button should not appear on C2 tab
+    expect(screen.queryByRole('button', { name: /Enregistrer/i })).toBeNull();
+  });
+
+  it('C2 tasks count pill shows when tasks exist', async () => {
+    mock.onGet('/simulations/7/c2/tasks').reply(200, {
+      tasks: [
+        {
+          id: 1,
+          mythic_task_display_id: 10,
+          callback_display_id: 1,
+          command: 'whoami',
+          params: null,
+          status: 'completed',
+          completed: true,
+          output: 'SYSTEM',
+          mapping_applied: false,
+          source: 'import',
+          created_at: '2026-06-10T10:00:00',
+          completed_at: '2026-06-10T10:00:05',
+        },
+      ],
+    });
+    renderWithProviders(<EditPage />, {
+      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
+    });
+
+    await waitFor(() => {
+      // Count pill shows "1" on the C2 tab
+      expect(screen.getByText('1')).toBeInTheDocument();
+    });
+  });
+});
+
+describe('SimulationFormPage — SOC role + pending (tab disabled)', () => {
+  let mock: MockAdapter;
+
+  beforeEach(() => {
+    mockRole = 'soc';
+    mock = new MockAdapter(apiClient);
+    mock.onGet('/simulations/7').reply(200, BASE_SIM);
+    mock.onGet('/engagements/42/c2-config').reply(404);
+    mock.onGet('/simulations/7/c2/tasks').reply(200, { tasks: [] });
+  });
+
+  afterEach(() => {
+    mock.restore();
+  });
+
+  it('SOC tab is disabled for SOC role when status is pending', async () => {
+    renderWithProviders(<EditPage />, {
+      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
+    });
+
+    await waitFor(() => expect(screen.getByRole('tab', { name: /SOC/i })).toBeDisabled());
   });
 
   it('Red Team inputs are disabled for SOC', async () => {
@@ -206,6 +339,7 @@ describe('SimulationFormPage — SOC role + review_required (can edit SOC fields
     mock = new MockAdapter(apiClient);
     mock.onGet('/simulations/7').reply(200, { ...BASE_SIM, status: 'review_required' });
     mock.onGet('/engagements/42/c2-config').reply(404);
+    mock.onGet('/simulations/7/c2/tasks').reply(200, { tasks: [] });
   });
 
   afterEach(() => {
@@ -217,10 +351,13 @@ describe('SimulationFormPage — SOC role + review_required (can edit SOC fields
       routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
     });
 
+    // Switch to SOC tab
+    await waitFor(() => expect(screen.getByRole('tab', { name: /SOC/i })).not.toBeDisabled());
+    fireEvent.click(screen.getByRole('tab', { name: /SOC/i }));
+
     await waitFor(() => {
       expect(screen.getByLabelText(/^Source de log/i)).not.toBeDisabled();
     });
-
     expect(screen.getByLabelText(/^Numéro d'incident/i)).not.toBeDisabled();
   });
 
@@ -234,23 +371,15 @@ describe('SimulationFormPage — SOC role + review_required (can edit SOC fields
     });
   });
 
-  it('does not show the blocked banner when status is review_required', async () => {
-    renderWithProviders(<EditPage />, {
-      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
-    });
-
-    await waitFor(() => {
-      expect(screen.getByLabelText(/^Source de log/i)).not.toBeDisabled();
-    });
-
-    expect(screen.queryByTestId('soc-blocked-banner')).toBeNull();
-  });
-
   it('shows "Close" for SOC when review_required', async () => {
     renderWithProviders(<EditPage />, {
       routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
     });
 
+    // Switch to SOC tab
+    await waitFor(() => expect(screen.getByRole('tab', { name: /SOC/i })).not.toBeDisabled());
+    fireEvent.click(screen.getByRole('tab', { name: /SOC/i }));
+
     await waitFor(() => {
       expect(screen.getByTestId('close-btn')).toBeInTheDocument();
     });
@@ -276,6 +405,15 @@ describe('SimulationFormPage — new simulation', () => {
     expect(screen.getByLabelText(/^Nom/i)).toBeInTheDocument();
     expect(screen.getByTestId('create-sim-btn')).toBeInTheDocument();
   });
+
+  it('SOC and C2 tabs are disabled in create mode', () => {
+    renderWithProviders(<NewPage />, {
+      routerProps: { initialEntries: ['/engagements/42/simulations/new'] },
+    });
+
+    expect(screen.getByRole('tab', { name: /SOC/i })).toBeDisabled();
+    expect(screen.getByRole('tab', { name: /Tâche C2/i })).toBeDisabled();
+  });
 });
 
 describe('SimulationFormPage — Execute via C2 button visibility', () => {
@@ -297,6 +435,7 @@ describe('SimulationFormPage — Execute via C2 button visibility', () => {
       url: 'https://mythic.lab:7443',
       verify_tls: true,
     });
+    mock.onGet('/simulations/7/c2/tasks').reply(200, { tasks: [] });
     renderWithProviders(<EditPage />, {
       routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
     });
@@ -307,6 +446,7 @@ describe('SimulationFormPage — Execute via C2 button visibility', () => {
 
   it('hides Execute via C2 button when no c2 config (404)', async () => {
     mock.onGet('/engagements/42/c2-config').reply(404);
+    mock.onGet('/simulations/7/c2/tasks').reply(200, { tasks: [] });
     renderWithProviders(<EditPage />, {
       routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
     });
@@ -323,100 +463,21 @@ describe('SimulationFormPage — Execute via C2 button visibility', () => {
       url: 'https://mythic.lab:7443',
       verify_tls: true,
     });
+    mock.onGet('/simulations/7/c2/tasks').reply(200, { tasks: [] });
     renderWithProviders(<EditPage />, {
       routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
     });
+    // Wait for RT tab to load; done sim disables RT editing
+    await waitFor(() => expect(screen.getByLabelText(/^Nom/i)).toBeDisabled());
+    // Execute via C2 not shown on done simulation
+    expect(screen.queryByTestId('c2-execute-btn')).toBeNull();
+    // Reopen is on the SOC tab — switch to confirm
+    const socTab = screen.getByRole('tab', { name: /SOC/i });
+    expect(socTab).not.toBeDisabled();
+    fireEvent.click(socTab);
     await waitFor(() => {
       expect(screen.getByTestId('reopen-btn')).toBeInTheDocument();
     });
-    expect(screen.queryByTestId('c2-execute-btn')).toBeNull();
-  });
-});
-
-describe('SimulationFormPage — C2 tasks panel visibility', () => {
-  let mock: MockAdapter;
-
-  beforeEach(() => {
-    mockRole = 'redteam';
-    mock = new MockAdapter(apiClient);
-    mock.onGet('/simulations/7').reply(200, BASE_SIM);
-  });
-
-  afterEach(() => {
-    mock.restore();
-  });
-
-  it('shows C2 tasks panel when c2 config exists (even with no tasks)', async () => {
-    mock.onGet('/engagements/42/c2-config').reply(200, {
-      has_token: true,
-      url: 'https://mythic.lab:7443',
-      verify_tls: true,
-    });
-    mock.onGet('/simulations/7/c2/tasks').reply(200, { tasks: [] });
-    renderWithProviders(<EditPage />, {
-      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
-    });
-    await waitFor(() => {
-      expect(screen.getByTestId('c2-tasks-panel')).toBeInTheDocument();
-    });
-  });
-
-  it('hides C2 tasks panel when no c2 config and no tasks', async () => {
-    mock.onGet('/engagements/42/c2-config').reply(404);
-    mock.onGet('/simulations/7/c2/tasks').reply(200, { tasks: [] });
-    renderWithProviders(<EditPage />, {
-      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
-    });
-    // Wait for page data to load then confirm no panel
-    await waitFor(() => {
-      expect(screen.getByLabelText(/^Nom/i)).not.toBeDisabled();
-    });
-    expect(screen.queryByTestId('c2-tasks-panel')).toBeNull();
-  });
-
-  it('shows C2 tasks panel when tasks exist even without c2 config', async () => {
-    mock.onGet('/engagements/42/c2-config').reply(404);
-    mock.onGet('/simulations/7/c2/tasks').reply(200, {
-      tasks: [
-        {
-          id: 1,
-          mythic_task_display_id: 10,
-          callback_display_id: 1,
-          command: 'whoami',
-          params: null,
-          status: 'completed',
-          completed: true,
-          output: 'SYSTEM',
-          mapping_applied: false,
-          source: 'import',
-          created_at: '2026-06-10T10:00:00',
-          completed_at: '2026-06-10T10:00:05',
-        },
-      ],
-    });
-    renderWithProviders(<EditPage />, {
-      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
-    });
-    await waitFor(() => {
-      expect(screen.getByTestId('c2-tasks-panel')).toBeInTheDocument();
-    });
-  });
-
-  it('SOC role never sees C2 tasks panel', async () => {
-    mockRole = 'soc';
-    mock.onGet('/engagements/42/c2-config').reply(200, {
-      has_token: true,
-      url: 'https://mythic.lab:7443',
-      verify_tls: true,
-    });
-    mock.onGet('/simulations/7/c2/tasks').reply(200, { tasks: [] });
-    renderWithProviders(<EditPage />, {
-      routerProps: { initialEntries: ['/engagements/42/simulations/7/edit'] },
-    });
-    await waitFor(() => {
-      expect(screen.getByTestId('soc-blocked-banner')).toBeInTheDocument();
-    });
-    expect(screen.queryByTestId('c2-tasks-panel')).toBeNull();
   });
 
   it('shows Import C2 history button when c2 config exists', async () => {
diff --git a/frontend/tests/components/Tabs.test.tsx b/frontend/tests/components/Tabs.test.tsx
index 927e107..2dd7ef3 100644
--- a/frontend/tests/components/Tabs.test.tsx
+++ b/frontend/tests/components/Tabs.test.tsx
@@ -82,3 +82,44 @@ describe('Tabs', () => {
     }
   });
 });
+
+describe('Tabs — disabled state', () => {
+  const ITEMS_WITH_DISABLED = [
+    { id: 'a', label: 'Alpha' },
+    { id: 'b', label: 'Beta', disabled: true },
+    { id: 'c', label: 'Gamma' },
+  ];
+
+  it('click on disabled tab does not fire onChange', () => {
+    const onChange = vi.fn();
+    render(<Tabs items={ITEMS_WITH_DISABLED} activeId="a" onChange={onChange} />);
+    fireEvent.click(screen.getByRole('tab', { name: /Beta/i }));
+    expect(onChange).not.toHaveBeenCalled();
+  });
+
+  it('has aria-disabled="true" on disabled tab', () => {
+    render(<Tabs items={ITEMS_WITH_DISABLED} activeId="a" onChange={vi.fn()} />);
+    const btn = screen.getByRole('tab', { name: /Beta/i });
+    expect(btn).toHaveAttribute('aria-disabled', 'true');
+  });
+
+  it('applies tab-underline-disabled class on disabled tab', () => {
+    render(<Tabs items={ITEMS_WITH_DISABLED} activeId="a" onChange={vi.fn()} />);
+    const btn = screen.getByRole('tab', { name: /Beta/i });
+    expect(btn).toHaveClass('tab-underline-disabled');
+  });
+
+  it('ArrowRight skips disabled tab (a → c, skipping b)', () => {
+    const onChange = vi.fn();
+    render(<Tabs items={ITEMS_WITH_DISABLED} activeId="a" onChange={onChange} />);
+    fireEvent.keyDown(screen.getByRole('tab', { name: /Alpha/i }), { key: 'ArrowRight' });
+    expect(onChange).toHaveBeenCalledWith('c');
+  });
+
+  it('ArrowLeft skips disabled tab (c → a, skipping b)', () => {
+    const onChange = vi.fn();
+    render(<Tabs items={ITEMS_WITH_DISABLED} activeId="c" onChange={onChange} />);
+    fireEvent.keyDown(screen.getByRole('tab', { name: /Gamma/i }), { key: 'ArrowLeft' });
+    expect(onChange).toHaveBeenCalledWith('a');
+  });
+});
diff --git a/tasks/todo.md b/tasks/todo.md
index 11df455..a4db4e3 100644
--- a/tasks/todo.md
+++ b/tasks/todo.md
@@ -1,260 +1,208 @@
-# Sprint 12 — i18n FR complet + EngagementDetailPage tab merge
+# Sprint 13 — SimulationFormPage : layout en 3 tabs (Red Team / SOC / Tâche C2)
 
-**Base** : `sprint/11-spectrum-ux` (PR #13 ouverte, pas encore mergée). Sprint 12 enchaîne directement.
-**Worktree** : `.claude/worktrees/sprint-12-i18n-fr/` (dédié — conforme à la mémoire worktree-per-sprint).
-**Branch** : `sprint/12-i18n-fr`.
-**Scope** : frontend uniquement. Backend intouché.
+**Base** : `sprint/12-i18n-fr` (PR #14 ouverte, pas encore mergée). Sprint 13 enchaîne directement.
+**Worktree** : `.claude/worktrees/sprint-13-sim-tabs/` (dédié — conforme à `feedback_worktree_per_sprint`).
+**Branch** : `sprint/13-sim-tabs`.
+**Scope** : frontend uniquement. Backend intouché. Aligné sur le pattern Tabs du sprint 11 (EngagementDetailPage 3→2 tabs) appliqué à SimulationFormPage.
 
 ---
 
 ## Décisions binding (lockées par user)
 
-1. **Approche i18n** : `react-i18next` complet (deps `react-i18next` + `i18next`, JSON FR, hook `useTranslation`).
-2. **Acronymes** : RT, SOC, MITRE, ATT&CK, C2, BAS, TLS, MITM, JWT, IP, URL, API, ID — **gardés en anglais** dans les valeurs FR.
-3. **Status enum** : valeurs DB (`pending`, `in_progress`, `done`, `planned`, `active`, `closed`) gardées EN — traduction au rendering layer via `i18n/status.ts`.
-4. **Format de date** : `fr-FR` locale (`jj/mm/aaaa`, ex. `20/06/2026`).
-5. **Ton toasts/alerts** : **bref** (ex. `"Engagement créé"`, pas `"Engagement enregistré avec succès"`).
-6. **Schedule → Description tab** : merger Schedule INTO Description. Résultat : 2 tabs (Description + Simulations).
+1. **Mode création** : 3 tabs visibles mais SOC + Tâche C2 **désactivés** (`aria-disabled="true"`, non-clickables, opacité réduite). Pas de banner ni d'empty-state — juste tab disabled.
+2. **Tab SOC** : désactivé tant que la sim n'est pas en `review_required` (ou plus). Force l'opérateur à passer par le RT pour avancer (Mark for review depuis sticky bar RT).
+3. **Sticky bar entièrement contextuelle** par tab :
+   - **RT tab** : `[Save, Mark for review]` (et `[Delete]` global, voir plus bas)
+   - **SOC tab** : `[Save SOC, Close]`
+   - **C2 tab** : aucune sticky bar — actions inline (`Execute via C2`, `Import C2 history`) déjà dans le tab content
+4. **Count pill sur tab Tâche C2** : nombre exact de tâches C2 (depuis le hook `useSimulationC2Tasks` existant). Caché si 0 ou en mode création.
+
+## Décisions secondaires (à appliquer par défaut)
+
+- **Default active tab** : Red Team (premier opérateur surface).
+- **Wiring URL** : `useHashTab('red-team')` (réutilise sprint 11). Hashes : `#red-team`, `#soc`, `#c2`.
+- **Delete + Reopen** : pas mentionnés dans la sticky bar contextuelle user. Décision team-lead :
+  - **Delete** sur le tab **RT** (action destructrice côté RT — c'est l'auteur).
+  - **Reopen** sur le tab **SOC** (cohérent avec Close, même actor flow). Visible quand status `done`.
+- **AlertBanner** (sprint 12) : `Done banner` reste visible au-dessus des tabs (status info, pas tab-spécifique). `SOC-blocked banner` disparaît (remplacé par le mécanisme de tab désactivé).
+- **C2TasksPanel** (sprint 8) : déplace son rendering DANS le panel du tab C2. Plus en-dessous de la 2-col.
+- **Header** (back link, title, status badge) : reste **au-dessus** des tabs, intouché.
 
 ## Contraintes constantes
 
 - Primary `#024ad8` Electric Blue intouchée.
-- Brutalisme intact : `rounded-none` partout sauf status pills + tab count pills + avatars, zéro `transition-*`, zéro `shadow-*`.
-- `tailwind.config.*` inchangé sauf cas exceptionnel justifié.
-- DESIGN.md amendments additives uniquement.
-- Mono uniquement pour data (IDs MITRE, dates ISO côté backend, commands, etc.).
+- Brutalisme intact : `rounded-none` (exceptions documentées), zéro `transition-*`, zéro `shadow-*`.
+- DESIGN.md amendments additives uniquement (sub-section "Sub-page tabs with disabled state" si besoin).
+- Tous les nouveaux labels passent par `i18n/fr.json` (cf. sprint 12) — pas de string EN hardcodée.
+- `pnpm build` MANDATORY avant push (leçon `feedback_css_apply_tokens`).
 
 ---
 
-## Task 1 — Merge Schedule into Description (mécanique, commit 1)
+## Task 1 — Extend Tabs primitive : support `disabled` per item
 
-**File** : `frontend/src/pages/EngagementDetailPage.tsx`
+**File** : `frontend/src/components/Tabs.tsx`
 
-**Current** (3 tabs Schedule / Description / Simulations) :
+Current `TabItem` :
 ```tsx
-type TabId = 'schedule' | 'description' | 'simulations';
-const items: TabItem<TabId>[] = [
-  { id: 'schedule',    label: 'Schedule' },
-  { id: 'description', label: 'Description' },
-  { id: 'simulations', label: 'Simulations', count },
-];
+interface TabItem<T extends string> { id: T; label: string; count?: number; }
 ```
 
-**Target** (2 tabs) :
+Target :
 ```tsx
-type TabId = 'description' | 'simulations';
-const items: TabItem<TabId>[] = [
-  { id: 'description', label: 'Description' },
-  { id: 'simulations', label: 'Simulations', count },
-];
+interface TabItem<T extends string> { id: T; label: string; count?: number; disabled?: boolean; }
 ```
 
-**Migration du contenu Schedule** : déplacer dans le panel Description, en HEADER (au-dessus du paragraphe description) :
-```tsx
-<header className="flex items-start justify-between gap-md mb-md">
-  <dl className="grid grid-cols-2 gap-x-lg gap-y-xxs text-caption-md">
-    <dt className="text-graphite">Start date</dt>     <dd>{formatDate(eng.start_date)}</dd>
-    <dt className="text-graphite">End date</dt>       <dd>{eng.end_date ? formatDate(eng.end_date) : '—'}</dd>
-    <dt className="text-graphite">Status</dt>         <dd><StatusBadge status={eng.status} /></dd>
-    <dt className="text-graphite">Created at</dt>     <dd>{formatDate(eng.created_at)}</dd>
-  </dl>
-  <Link to={`/engagements/${id}/edit`} className="btn-outline">Edit</Link>
-</header>
-<hr className="my-md border-hairline" />
-<h2 className="text-display-sm mb-sm">Description</h2>
-{eng.description || <p className="text-graphite">No description provided.</p>}
+Comportement quand `disabled` :
+- `<button>` reçoit `disabled={true}` et `aria-disabled="true"`
+- Class CSS `.tab-underline-disabled` ajoutée (nouvelle recipe ci-dessous)
+- Le hover ne change pas la couleur (`hover:text-graphite` ou rien)
+- ArrowLeft/ArrowRight nav skippent les tabs disabled (cycle vers le tab actif suivant non-disabled)
+- Clicks ignorés (`onClick={() => !disabled && onChange(item.id)}`)
+- `aria-selected` reste `false` quand disabled
+
+**New recipe** dans `frontend/src/styles/index.css` :
+```css
+.tab-underline-disabled {
+  @apply text-graphite opacity-50 cursor-not-allowed;
+}
 ```
 
-- Default `useHashTab('description')` au lieu de `'schedule'`.
-- Header de la page (BackLink + name + créé par + Edit + Export) reste **au-dessus des tabs**, intouché.
-- Mettre à jour `EngagementDetailPage.test.tsx` si une assertion vise le tab "Schedule".
+(Override le hover du `.tab-underline` parent ; pas de `border-primary` sur l'active state quand disabled — n'arrivera jamais puisque `aria-selected=false`.)
 
-**Note** : les strings ci-dessus seront ensuite traduites dans le pass i18n. Pas la peine de les écrire en FR dans commit 1.
+**Tests** : extend `Tabs.test.tsx` :
+- Tab avec `disabled: true` ne fire pas `onChange` au click
+- ArrowRight/ArrowLeft skippent les tabs disabled
+- `aria-disabled="true"` présent
+- Classe `.tab-underline-disabled` appliquée
+
+DESIGN.md : ajouter 1 ligne dans la sub-section `Sub-page tabs` documentant la variante `disabled`.
 
 ---
 
-## Task 2 — Full FR translation via react-i18next
+## Task 2 — SimulationFormPage : refactor en 3 tabs
 
-### Structure cible
+**File** : `frontend/src/pages/SimulationFormPage.tsx`
 
+**Layout cible (edit mode)** :
 ```
-frontend/src/i18n/
-├── index.ts          # init i18next, single FR locale
-├── fr.json           # toutes les keys FR
-└── status.ts         # engagementStatusLabel + simulationStatusLabel
+[Header : ← Retour à l'engagement | titre sim | status badge]
+[AlertBanner Done si done (au-dessus des tabs, status info global)]
+[Tabs : Red Team | SOC (disabled si !=review_required+) | Tâche C2 (count pill)]
+[Panel du tab actif :
+  - Red Team : tous les fields RT (Name, MITRE Techniques, Description, Commands, Prerequisites, Executed at, Execution result) + actions inline (Execute via C2, Import C2 history déjà existants en sprint 8/12)
+  - SOC : tous les fields SOC (Log source, Logs, SOC comment, Incident number)
+  - Tâche C2 : C2TasksPanel (sprint 8) directement, sans wrapper
+]
+[Sticky bar bottom (contextuel selon tab actif) :
+  - RT : [Save] [Mark for review (si pending/in_progress)] ... [Delete (toujours)]
+  - SOC : [Save SOC] [Close (si review_required)] [Reopen (si done)]
+  - C2 : aucune sticky bar (display:none ou pas de render)
+]
 ```
 
-### Init (`frontend/src/i18n/index.ts`)
-```ts
-import i18n from 'i18next';
-import { initReactI18next } from 'react-i18next';
-import fr from './fr.json';
-
-i18n.use(initReactI18next).init({
-  resources: { fr: { translation: fr } },
-  lng: 'fr',
-  fallbackLng: 'fr',
-  interpolation: { escapeValue: false },
-  returnEmptyString: false,
-});
-
-export default i18n;
+**Layout en mode création (new)** :
+```
+[Header : ← Retour à l'engagement | "Nouvelle simulation"]
+[Tabs : Red Team (active) | SOC (disabled) | Tâche C2 (disabled, pas de count pill)]
+[Panel Red Team : champs simplifiés (juste Name + MITRE Techniques minimum)]
+[Sticky bar bottom : [Create simulation] [Cancel]]
 ```
 
-Mount dans `frontend/src/main.tsx` : `import './i18n'` avant `<App />`.
+**Wiring** :
+- `useHashTab<TabId>('red-team')` où `TabId = 'red-team' | 'soc' | 'c2'`.
+- Items du Tabs :
+  ```tsx
+  const items: TabItem<TabId>[] = [
+    { id: 'red-team', label: t('simulation.form.tab.redTeam') },
+    { 
+      id: 'soc', 
+      label: t('simulation.form.tab.soc'),
+      disabled: !editing || sim.status === 'pending' || sim.status === 'in_progress',
+    },
+    { 
+      id: 'c2', 
+      label: t('simulation.form.tab.c2'),
+      count: editing ? c2Tasks?.length : undefined,
+      disabled: !editing,
+    },
+  ];
+  ```
+- Le hook `useHashTab` doit fallback proprement : si `#soc` mais tab disabled, retomber sur `'red-team'`. **Vérifie le comportement actuel** (sprint 11 a peut-être déjà ça, sinon ajout dans la même PR).
 
-### Pattern usage
-```tsx
-const { t } = useTranslation();
-<button>{t('common.save')}</button>
-<h1>{t('engagement.list.title')}</h1>
-<p>{t('engagement.delete.confirm', { name: eng.name })}</p>
+**Sticky bar contextuel** :
+- Wrapper `<div className="sticky bottom-0 …">` avec contenu conditionnel `{activeTab === 'red-team' && <RtActions />}{activeTab === 'soc' && <SocActions />}{activeTab === 'c2' && null}`.
+- Ne pas rendre le wrapper du tout si C2 actif (pas de sticky div vide).
+- Réutiliser les boutons existants (Save/Mark/Save SOC/Close/Reopen/Delete) — juste les regrouper.
+
+**Banners** :
+- `Done banner` (success) : garde au-dessus des tabs, indépendant du tab actif.
+- `SOC-blocked banner` (warn) : **supprime**. Le mécanisme de tab désactivé remplace.
+
+**C2TasksPanel** : déplacer son rendering directement dans `{activeTab === 'c2' && <C2TasksPanel … />}`. Conserver toutes les props existantes. Le `[Execute via C2]` et `[Import C2 history]` qui étaient dans la carte Red Team du sprint 8 — décision : **les laisser dans le tab Red Team** (ce sont des actions RT qui déclenchent le C2). Le tab C2 montre juste le panel des tâches.
+
+**Tests** : `SimulationFormPage.test.tsx` — refactor important :
+- Les anciens tests "RT card visible AND SOC card visible simultaneously" → maintenant on test "RT tab content visible, SOC tab content via switch-tab".
+- Tests Mark/Close/Reopen : naviguer vers le bon tab avant d'asserter le bouton.
+- Tests `data-testid="soc-blocked-banner"` : ce testid disparaît — ajuster ou supprimer le test.
+- Add : tab SOC `disabled` quand status pending → test que click ne change pas le tab actif.
+- Add : count pill sur tab C2 reflète le nombre de tasks.
+
+## Task 3 — i18n keys nouvelles + DESIGN.md
+
+**`fr.json`** ajouter :
+```json
+"simulation.form.tab.redTeam": "Red Team",
+"simulation.form.tab.soc": "SOC",
+"simulation.form.tab.c2": "Tâche C2"
 ```
+(`Red Team` reste idiom, `SOC` acronyme — cohérent avec les conventions sprint 12.)
 
-### Convention de keys — **nested by feature**
-
-```
-common.*            save, cancel, delete, edit, new, loading, retry, back, dismiss
-nav.*               engagements, templates, users, signOut, brand
-auth.*              login.title, login.subtitle, login.signIn, login.signingIn, login.invalid, forbidden
-engagement.list.*   title, subtitle, new, empty.title, empty.desc, col.name, col.status, col.start, col.end, col.createdBy, col.actions, view, edit, delete, deleteConfirm, toast.deleted, error.delete
-engagement.detail.* tabs.description, tabs.simulations, schedule.startDate, schedule.endDate, schedule.status, schedule.createdAt, edit, createdBy, noDescription, loading, errorLoad, notFound
-engagement.form.*   title.new, title.edit, subtitle.new, subtitle.edit, field.name, field.description, field.startDate, field.endDate, field.endDateHint, field.status, validation.nameRequired, validation.startDateRequired, validation.endDateAfterStart, btn.create, btn.save, btn.saving, btn.cancel, toast.created, toast.updated, error.save, error.load
-simulation.form.*   title.new, field.name, field.mitre, field.description, field.commands, field.commandsHint, field.prerequisites, field.executedAt, field.executionResult, btn.create, btn.creating, btn.save, btn.saving, btn.saveSoc, btn.markReview, btn.close, btn.reopen, btn.delete, btn.executeC2, btn.importC2History, btn.cancel, deleteConfirm.title, deleteConfirm.desc, deleteConfirm.confirm, deleteConfirm.cancel, banner.done, banner.socNotReady, header.redTeam, header.soc, field.logSource, field.logs, field.socComment, field.incidentNumber, validation.nameRequired, toast.created, toast.updated, toast.deleted, toast.markedReview, toast.closed, toast.reopened, toast.socUpdated, error.create, error.update, error.delete, error.soc, error.transition, loading, errorLoad
-template.list.*     title, subtitle, new, empty.title, empty.desc, col.name, col.description, col.commands, col.createdAt, edit, delete
-template.form.*     title.new, title.edit, field.name, field.description, field.descriptionPlaceholder, field.commands, field.commandsHint, field.commandsPlaceholder, field.prerequisites, field.prerequisitesPlaceholder, field.mitre, field.mitreSearch, field.mitreOpenMatrix, field.mitreEmpty, btn.save, btn.saving, btn.delete, btn.cancel, validation.nameRequired, toast.created, toast.saved, toast.deleted, deleteConfirm.title, deleteConfirm.desc, deleteConfirm.confirm, deleteConfirm.cancel, loading, errorLoad, errorSave, errorDelete
-user.admin.*        title, subtitle, new, col.username, col.role, col.createdAt, col.actions, role.admin, role.redteam, role.soc, field.username, field.password, btn.create, btn.creating, btn.resetPassword, btn.delete, btn.cancel, ...
-c2.config.*         title, disabled, field.url, field.urlHint, field.token, field.tokenHint, field.verifyTls, verifyTlsHint, btn.save, btn.saving, btn.test, btn.testing, btn.delete, toast.saved, toast.tested, toast.deleted, error.save, error.test, error.delete
-c2.tasks.*          title, empty, col.task, col.command, col.source, col.status, col.completedAt, refreshing
-c2.modal.execute.*  title, callback, btn.launch, btn.launching, btn.cancel, commandCount_one, commandCount_other, validation.callbackRequired, validation.commandsRequired, toast.launched, error.launch
-c2.modal.import.*   title, total, page, of, prev, next, btn.import, btn.importing, btn.cancel, selected, empty, toast.imported, toast.partial, error.import
-c2.modal.picker.*   title, empty, hostnameColon, lastCheckinColon
-mitre.matrix.*      title, filter, loading, error, applyItem_one, applyItem_other, clearAll, close, retry
-mitre.field.*       empty, search, openMatrix, savedToast, errorToast
-mitre.tag.*         remove
-state.*             loading, error.title, error.desc, empty.default, retry
-toast.*             dismiss
-status.engagement.* planned, active, closed
-status.simulation.* pending, in_progress, review_required, done
-```
-
-### Status enum map (`frontend/src/i18n/status.ts`)
-```ts
-import i18n from './index';
-import type { EngagementStatus, SimulationStatus } from '@/types';
-
-export const engagementStatusLabel = (s: EngagementStatus): string =>
-  i18n.t(`status.engagement.${s}`);
-export const simulationStatusLabel = (s: SimulationStatus): string =>
-  i18n.t(`status.simulation.${s}`);
-```
-
-Consumers : `StatusBadge.tsx`, `SimulationStatusBadge.tsx` si distinct, `EngagementDetailPage` (header dans Description tab), `EngagementFormPage` (STATUS_OPTIONS dérivé du map), `SimulationFormPage` banners (restructurer comme phrases entières dans JSON, pas inline status word).
-
-### Date formatting (`frontend/src/lib/format.ts`)
-```ts
-export const formatDate = (iso: string | null | undefined): string => {
-  if (!iso) return '—';
-  return new Date(iso).toLocaleDateString('fr-FR');  // jj/mm/aaaa
-};
-export const formatDateTime = (iso: string): string =>
-  new Date(iso).toLocaleString('fr-FR');
-```
-
-Replace raw ISO renders dans : `EngagementDetailPage`, `EngagementsListPage`, `TemplatesListPage`, `UsersAdminPage`. Garder ISO dans les commands / execution_result / params (data brut).
-
-### Acronymes — locked EN dans le JSON FR
-
-Exemples corrects :
-- `"c2.config.title": "Configuration C2"`
-- `"mitre.matrix.title": "Matrice MITRE ATT&CK"`
-- `"simulation.form.header.redTeam": "Red Team"` (acronyme idiom)
-- `"simulation.form.header.soc": "SOC"` (acronyme)
-- `"auth.forbidden": "Accès refusé"` (déjà FR dans le code)
-
-### Strings déjà FR (preserve)
-
-- `ProtectedRoute.tsx:35` → `'Accès refusé'` (déjà FR). Route via `t('auth.forbidden')`.
-- `Toast.test.tsx:28` → assertion `'Session expirée'`. Confirmer cohérence avec la key associée.
-
-### Composants out-of-scope
-
-`ForbiddenState.tsx` et `NotFoundState.tsx` n'existent pas — pas de keys i18n à créer. Si tu vois un cas où ils manquent, **flag dans le PR body** pour un sprint follow-up, ne crée rien.
+**DESIGN.md** § Navigation > Sub-page tabs : ajouter 1 paragraphe sur la variante `disabled` (visual : opacity-50 + cursor-not-allowed, aria-disabled, skipped par arrow-keys).
 
 ---
 
-## Counts (estimation workflow)
+## Counts attendus
 
 | Métrique | Valeur |
 |---|---|
-| Strings UI uniques à traduire (dedup) | **~140 keys** |
-| Test assertions à update | **~123** (sur 193 raw matches, 70 sont data fixture) |
-| Fichiers source modifiés | **~30** |
-| Fichiers tests modifiés | **23** |
-| Nouveaux fichiers | 3 (`i18n/index.ts`, `i18n/fr.json`, `i18n/status.ts`) |
+| Fichiers source modifiés | 3 (`Tabs.tsx`, `SimulationFormPage.tsx`, `index.css` recipe) |
+| Fichiers source touched (juste i18n keys) | 1 (`fr.json`) |
+| Fichiers tests modifiés | 2 (`Tabs.test.tsx`, `SimulationFormPage.test.tsx`) |
+| Nouveaux fichiers | 0 |
+| DESIGN.md amendments | 1 paragraphe additive |
 
 ---
 
-## Commits plan (10 commits)
+## Commits plan (~4 commits)
 
-1. `feat(frontend): merge Schedule tab into Description on EngagementDetailPage`
-2. `chore(frontend): install react-i18next + i18next deps`
-3. `feat(frontend): scaffold i18n init, fr.json skeleton, status map`
-4. `feat(frontend): i18n common + nav + auth (Layout, LoginPage, ProtectedRoute)`
-5. `feat(frontend): i18n engagement pages (list, detail, form) + status map wiring`
-6. `feat(frontend): i18n simulation pages (form + list component)`
-7. `feat(frontend): i18n template pages (list + form + picker modal)`
-8. `feat(frontend): i18n MITRE components (matrix modal, picker, field, tag)`
-9. `feat(frontend): i18n C2 components (config, tasks, modals, picker)`
-10. `feat(frontend): i18n shared state components + users admin + fr-FR date formatting`
+1. `feat(frontend): Tabs primitive supports per-item disabled state` (Tabs.tsx + recipe + Tabs.test.tsx)
+2. `feat(frontend): SimulationFormPage 3-tab layout (Red Team / SOC / C2 tasks)` (SimulationFormPage.tsx + tests + i18n keys + DESIGN.md amendment)
+3. `refactor(frontend): contextual sticky bar per active tab on SimulationFormPage` (extraction des actions par tab, supprimer SOC-blocked banner)
+4. `docs(changelog): sprint 13 simulation tabs entry`
 
-**Ordre** : chaque commit = une slice verticale (source + tests mis à jour ensemble) → vitest reste vert à chaque commit.
-
----
-
-## Tests strategy
-
-### Baseline
-- vitest **236/236** doit tenir à chaque commit.
-- Tests rendent avec i18n init déjà chargé (FR loaded), pas de mock setup needed.
-
-### Pattern de rewrite (3 stratégies)
-1. **Direct rewrite** (cas le plus fréquent) : `getByRole('button', { name: /save/i })` → `getByRole('button', { name: /enregistrer/i })`.
-2. **Refactor vers `data-testid`** (recommandé pour les boutons avec action semantics) : `data-testid="btn-save"` côté source, `getByTestId('btn-save')` côté test. Survit aux re-wordings futurs.
-   - Cible prioritaire : `SimulationFormPage.test.tsx` (5 boutons), `UsersAdminPage.test.tsx` (4), `TemplateFormPage.test.tsx` (4), `EngagementFormPage.test.tsx` (2).
-3. **Keep domain assertions** (~70 sites) : `getByText('T1078')`, `getByText('alice')`, `getByText('WIN-DC01')`, `getByText('whoami')`. Pas de change.
-
-### Nouveau test (commit 3)
-`frontend/tests/i18n.test.ts` :
-- i18n init avec `lng: 'fr'`.
-- `t('common.save')` → `'Enregistrer'`.
-- Missing key returns key path (debug).
-- `simulationStatusLabel('done')` → `'Terminé'`.
-- Interpolation : `t('engagement.delete.confirm', { name: 'X' })` contient `« X »`.
+Collapse à 2-3 si plus efficace.
 
 ---
 
 ## DoD
 
-1. EngagementDetailPage a **2 tabs** (Description + Simulations). Schedule content = header block dans le panel Description. Edit button atteignable.
-2. `package.json` inclut `react-i18next` et `i18next`.
-3. `frontend/src/i18n/index.ts` initialise i18next avec FR comme `lng` ET `fallbackLng`.
-4. `frontend/src/i18n/fr.json` contient ~140 keys, organisées en namespaces nested.
-5. `frontend/src/i18n/status.ts` expose les 2 labels et est consommé partout où raw status est rendu.
-6. **Zéro string UI EN hardcodée** dans `frontend/src/pages/` + `frontend/src/components/`. Exceptions autorisées : acronymes (liste lockée), brand "Mimic", glyphes (`—`, `×`, `▾`, `▸`), API enum passthroughs, MITRE IDs, command/payload text.
-7. Dates rendues via `formatDate()` au format `fr-FR` (jj/mm/aaaa).
-8. `npm run test` → **236+ / 236+** (+5 nouveaux tests i18n).
-9. `npm run build` succès (zéro TS error, PostCSS clean — leçon `feedback_css_apply_tokens` respectée).
-10. **Manual smoke obligatoire** : login → engagements → detail → simulation form → templates → users → C2 config — chaque string visible est en FR (sauf acronymes + brand).
-11. CHANGELOG.md entrée sprint 12 listant migration i18n + tab merge.
-
----
+1. SimulationFormPage en edit mode : 3 tabs visibles (Red Team default, SOC, Tâche C2). Count pill sur C2 = `c2Tasks.length`.
+2. Tabs SOC + C2 désactivés en mode création.
+3. Tab SOC désactivé tant que status ∉ `{review_required, done}`.
+4. Sticky bar contextuelle : RT [Save + Mark for review + Delete], SOC [Save SOC + Close + Reopen], C2 [aucune sticky bar].
+5. `useHashTab` gère le fallback gracieux quand hash pointe vers un tab disabled (retombe sur `'red-team'`).
+6. Tabs primitive : ArrowLeft/ArrowRight skippent les tabs disabled.
+7. AlertBanner Done garde sa place au-dessus des tabs (status global). SOC-blocked banner supprimé.
+8. C2TasksPanel rendu dans le tab C2 panel.
+9. `[Execute via C2]` + `[Import C2 history]` restent dans le tab Red Team.
+10. Tests : Tabs.test.tsx + SimulationFormPage.test.tsx adaptés, baseline ≥ 245 vitest, +N nouveaux tests sur disabled tabs + count pill + tab gating.
+11. `tsc --noEmit` + `eslint --max-warnings=0` + `pnpm build` clean.
+12. CHANGELOG.md entrée sprint 13.
 
 ## Out of scope (explicite)
 
-- ❌ Backend i18n (pas de translations DB-side)
-- ❌ Multi-langue (uniquement FR pour ce sprint, infra prête mais pas d'EN switcher)
-- ❌ Language picker UI
-- ❌ ForbiddenState / NotFoundState components creation
-- ❌ Color palette / brutalism / token changes
-- ❌ New features
+- ❌ Refactor des sub-forms RT / SOC (juste déplacement dans le tab)
+- ❌ Nouveau pattern Tabs ailleurs (uniquement SimulationFormPage cette sprint)
+- ❌ Changes backend
+- ❌ Color / brutalism / token changes
+- ❌ Multi-langue (FR uniquement, infra sprint 12)