diff --git a/components/ChatbotPensees.vue b/components/ChatbotPensees.vue
index 7cf1004..8451cd2 100644
--- a/components/ChatbotPensees.vue
+++ b/components/ChatbotPensees.vue
@@ -1,4 +1,4 @@
-<template>
+<template>
   <button v-if="!open" @click="open = true"
     class="fixed bottom-6 right-6 z-[1000] flex items-center gap-2 px-4 rounded-full shadow-lg"
     style="height:48px;background:var(--nav-primary);color:var(--nav-text-on-primary);font-size:0.875rem;font-weight:600;"
@@ -13,6 +13,7 @@
     <div v-if="open" class="fixed bottom-6 right-6 z-[1000] flex flex-col"
       style="width:min(360px,calc(100vw - 24px));max-height:60vh;background:var(--nav-surface);border-radius:14px;box-shadow:0 8px 32px rgba(26,34,56,0.22);overflow:hidden;border:1px solid var(--nav-bg-alt);"
       role="dialog" aria-modal="true" aria-label="RAG Pensees Ecologiques">
+      <!-- Header -->
       <div class="flex items-center justify-between px-4 py-3 shrink-0" style="border-bottom:1px solid var(--nav-bg-alt);background:var(--nav-bg);">
         <div>
           <p class="text-sm font-bold" style="color:var(--nav-text);">RAG Pensees Ecologiques</p>
@@ -25,9 +26,31 @@
           </svg>
         </button>
       </div>
+
+      <!-- Corpus toggle -->
+      <div class="shrink-0 px-3 pt-2 pb-1" style="background:var(--nav-bg);border-bottom:1px solid var(--nav-bg-alt);">
+        <div class="flex gap-1" role="group" aria-label="Choisir le corpus">
+          <button
+            v-for="opt in corpusOptions"
+            :key="opt.value"
+            @click="setCorpus(opt.value)"
+            :title="opt.tooltip"
+            class="flex-1 px-2 py-1 rounded text-xs font-medium transition-colors"
+            :style="corpus === opt.value
+              ? 'background:var(--nav-primary);color:var(--nav-text-on-primary);'
+              : 'background:var(--nav-bg-alt);color:var(--nav-text-muted);'"
+            :aria-pressed="corpus === opt.value">
+            {{ opt.label }}
+          </button>
+        </div>
+      </div>
+
+      <!-- Messages -->
       <div ref="msgEl" class="flex-1 overflow-y-auto px-4 py-3 flex flex-col gap-3" style="min-height:0;">
         <div v-if="messages.length === 0" style="font-size:0.8rem;color:var(--nav-text-muted);line-height:1.5;">
-          Pose une question sur les pensees ecologiques : ecosocialisme, decroissance, ecofeminismes, technocritique, deep ecology...
+          <template v-if="corpus === 'pensees'">Pose une question sur les pensees ecologiques : ecosocialisme, decroissance, ecofeminismes, technocritique, deep ecology...</template>
+          <template v-else-if="corpus === 'projets'">Pose une question sur les projets d'architecture de Jules : Butte Pinson, strategie thermique, partis pris constructifs...</template>
+          <template v-else>Pose une question sur les pensees ecologiques ancrees dans les projets archi de Jules (corpus croise, defaut).</template>
         </div>
         <template v-for="(msg, i) in messages" :key="i">
           <div v-if="msg.role === 'user'" class="self-end max-w-[85%] px-3 py-2 rounded-xl text-sm"
@@ -35,14 +58,14 @@
           <div v-else class="self-start max-w-full">
             <div class="px-3 py-2 rounded-xl text-sm leading-relaxed" style="background:var(--nav-bg-alt);color:var(--nav-text);"
               v-html="renderMd(stripSrc(msg.content))" />
-            <div v-if="parseSrc(msg.content).length" class="mt-1.5">
+            <div v-if="filteredSources(msg.content).length" class="mt-1.5">
               <button @click="toggled[i] = !toggled[i]" class="flex items-center gap-1 text-xs hover:opacity-70" style="color:var(--nav-text-muted);">
                 <svg width="11" height="11" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round"
                   :style="`transform:rotate(${toggled[i] ? 90 : 0}deg);transition:transform 0.15s`"><polyline points="9 18 15 12 9 6"/></svg>
-                Sources ({{ parseSrc(msg.content).length }})
+                Sources ({{ filteredSources(msg.content).length }})
               </button>
               <div v-if="toggled[i]" class="mt-1 flex flex-col gap-1">
-                <div v-for="(s, si) in parseSrc(msg.content)" :key="si" class="px-2 py-1 rounded text-xs"
+                <div v-for="(s, si) in filteredSources(msg.content)" :key="si" class="px-2 py-1 rounded text-xs"
                   style="background:var(--nav-bg-alt);color:var(--nav-text-muted);border-left:2px solid var(--nav-primary-solid);">
                   <span style="font-weight:600;color:var(--nav-text);">[{{ si + 1 }}]</span> {{ s }}
                 </div>
@@ -55,6 +78,8 @@
         </div>
         <div v-if="err" class="text-xs px-3 py-2 rounded-xl" style="background:#fee;color:#c0392b;">{{ err }}</div>
       </div>
+
+      <!-- Input -->
       <div class="shrink-0 px-3 py-3" style="border-top:1px solid var(--nav-bg-alt);">
         <div class="flex items-center gap-2">
           <input ref="inputEl" v-model="q" type="text" placeholder="Ta question..." maxlength="500"
@@ -77,6 +102,25 @@
 
 <script setup lang="ts">
 interface Message { role: 'user' | 'assistant'; content: string }
+
+type CorpusMode = 'pensees' | 'projets' | 'both'
+
+const CORPUS_STORAGE_KEY = 'chatbot-pensees-corpus'
+
+// Patterns projet : les sources qui matchent sont des refs projet archi
+// Pattern actuel : butte pinson. Extensible en ajoutant d'autres slugs.
+const PROJECT_SOURCE_PATTERNS = [/butte.?pinson/i, /butte_pinson/i]
+
+function isProjectSource(s: string): boolean {
+  return PROJECT_SOURCE_PATTERNS.some(p => p.test(s))
+}
+
+const corpusOptions: { value: CorpusMode; label: string; tooltip: string }[] = [
+  { value: 'pensees', label: 'Pensees', tooltip: 'Corpus FRACAS uniquement (auteurs ecologie politique)' },
+  { value: 'projets', label: 'Projets', tooltip: 'Projets archi de Jules uniquement' },
+  { value: 'both',    label: 'Croise*', tooltip: 'Projets ancres + pensees en eclairage (defaut)' },
+]
+
 const props = defineProps<{ auteurContext?: string | null }>()
 const open = ref(false)
 const q = ref('')
@@ -88,6 +132,23 @@ const msgEl = ref<HTMLElement | null>(null)
 const inputEl = ref<HTMLInputElement | null>(null)
 const corpusCount = 18
 
+// Corpus state - init depuis localStorage
+const corpus = ref<CorpusMode>('both')
+
+if (typeof window !== 'undefined') {
+  const saved = window.localStorage.getItem(CORPUS_STORAGE_KEY) as CorpusMode | null
+  if (saved && ['pensees', 'projets', 'both'].includes(saved)) {
+    corpus.value = saved
+  }
+}
+
+function setCorpus(val: CorpusMode) {
+  corpus.value = val
+  if (typeof window !== 'undefined') {
+    window.localStorage.setItem(CORPUS_STORAGE_KEY, val)
+  }
+}
+
 watch(open, (val) => {
   if (!val) return
   nextTick(() => inputEl.value?.focus())
@@ -109,7 +170,10 @@ async function send() {
   loading.value = true
   await nextTick(); scrollBottom()
   try {
-    const res = await $fetch<{ response: string }>('/api/chatbot-pensees', { method: 'POST', body: { query, mode: 'hybrid' } })
+    const res = await $fetch<{ response: string }>('/api/chatbot-pensees', {
+      method: 'POST',
+      body: { query, mode: 'hybrid', corpus: corpus.value },
+    })
     messages.value.push({ role: 'assistant', content: res.response ?? '' })
   } catch (e: any) {
     const s = e?.response?.status ?? e?.statusCode
@@ -119,16 +183,28 @@ async function send() {
     await nextTick(); scrollBottom()
   }
 }
+
 function scrollBottom() { if (msgEl.value) msgEl.value.scrollTop = msgEl.value.scrollHeight }
+
 function renderMd(t: string) {
   return '<p>' + t.replace(/\*\*(.+?)\*\*/g, '<strong>$1</strong>').replace(/\*(.+?)\*/g, '<em>$1</em>').replace(/\n\n/g, '</p><p>').replace(/\n/g, '<br>') + '</p>'
 }
 function stripSrc(t: string) { return t.replace(/\n*(?:Sources?|References?)\s*:[\s\S]*$/i, '').trim() }
+
 function parseSrc(t: string): string[] {
   const bloc = t.match(/\n*(?:Sources?|References?)\s*:\n?([\s\S]+?)$/i)
   if (bloc) return bloc[1].split('\n').map(l => l.replace(/^[-*\d.[\]]+\s*/, '').trim()).filter(l => l.length > 3)
   return [...new Set([...t.matchAll(/\[([^\]]{5,80})\]/g)].filter(m => m[1].includes(' - ')).map(m => m[1]))]
 }
+
+// Filtrage UI des sources selon corpus actif
+function filteredSources(t: string): string[] {
+  const all = parseSrc(t)
+  if (corpus.value === 'both') return all
+  if (corpus.value === 'projets') return all.filter(s => isProjectSource(s))
+  // corpus === 'pensees' : exclure les sources projet
+  return all.filter(s => !isProjectSource(s))
+}
 </script>
 
 <style scoped>
@@ -138,4 +214,4 @@ function parseSrc(t: string): string[] {
 .cpanel-leave-to { opacity: 0; transform: translateY(8px) scale(0.97); }
 .dots span { display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--nav-text-muted);margin:0 2px;animation:bounce 1s infinite; }
 @keyframes bounce { 0%,80%,100%{transform:translateY(0)}40%{transform:translateY(-5px)} }
-</style>
\ No newline at end of file
+</style>