diff --git a/Frontend/src/App.jsx b/Frontend/src/App.jsx
index 04f30af..c75b70f 100755
--- a/Frontend/src/App.jsx
+++ b/Frontend/src/App.jsx
@@ -6,6 +6,7 @@ import Footer from "./components/footer";
 import { GameTick } from "./components/GameTick";
 import { GameSync } from "./components/GameSync";
 import { OfflineReport } from "./components/OfflineReport";
+import { ToastContainer } from "./components/ToastContainer";
 
 import navData from "./data/NavBarData.json";
 
@@ -17,6 +18,7 @@ function App() {
       <GameTick />
       <GameSync />
       <OfflineReport />
+      <ToastContainer />
       <Navbar
         navData={navData}
         toggleRain={toggleRain}
diff --git a/Frontend/src/components/ToastContainer.tsx b/Frontend/src/components/ToastContainer.tsx
new file mode 100644
index 0000000..041c474
--- /dev/null
+++ b/Frontend/src/components/ToastContainer.tsx
@@ -0,0 +1,56 @@
+// ToastContainer.tsx — Stack de toasts en bas à droite
+
+import { useToastStore } from "../store/useToastStore";
+import type { ToastVariant } from "../store/useToastStore";
+
+const VARIANT_STYLES: Record<ToastVariant, string> = {
+  success: "border-emerald-500/40 bg-emerald-500/10",
+  info: "border-blue-400/40 bg-blue-400/10",
+  reward: "border-amber-400/40 bg-amber-400/10",
+  warning: "border-red-400/40 bg-red-400/10",
+};
+
+const VARIANT_ICONS: Record<ToastVariant, string> = {
+  success: "✓",
+  info: "ℹ",
+  reward: "★",
+  warning: "⚠",
+};
+
+const VARIANT_ICON_COLORS: Record<ToastVariant, string> = {
+  success: "text-emerald-400",
+  info: "text-blue-400",
+  reward: "text-amber-400",
+  warning: "text-red-400",
+};
+
+export function ToastContainer() {
+  const toasts = useToastStore((s) => s.toasts);
+  const remove = useToastStore((s) => s.removeToast);
+
+  if (toasts.length === 0) return null;
+
+  return (
+    <div className="fixed bottom-4 right-4 z-[60] flex flex-col gap-2 max-w-sm">
+      {toasts.map((t) => (
+        <div
+          key={t.id}
+          onClick={() => remove(t.id)}
+          className={`
+            gp cursor-pointer border
+            ${VARIANT_STYLES[t.variant]}
+            animate-[slide-in_0.3s_ease-out]
+          `}
+          style={{ backdropFilter: "blur(12px)" }}
+        >
+          <div className="flex items-center gap-2">
+            <span className={`text-sm font-bold ${VARIANT_ICON_COLORS[t.variant]}`}>
+              {VARIANT_ICONS[t.variant]}
+            </span>
+            <span className="gp-value text-[0.75rem]!">{t.message}</span>
+          </div>
+        </div>
+      ))}
+    </div>
+  );
+}
diff --git a/Frontend/src/data/NavBarData.json b/Frontend/src/data/NavBarData.json
index 9ce56f8..1266361 100755
--- a/Frontend/src/data/NavBarData.json
+++ b/Frontend/src/data/NavBarData.json
@@ -10,5 +10,11 @@
     "linkname": "Succès",
     "linkurl": "/achievements",
     "btn": false
+  },
+  {
+    "id": "4",
+    "linkname": "Guide",
+    "linkurl": "/guide",
+    "btn": false
   }
 ]
diff --git a/Frontend/src/index.css b/Frontend/src/index.css
index 5c105e0..5d444ac 100755
--- a/Frontend/src/index.css
+++ b/Frontend/src/index.css
@@ -366,6 +366,17 @@
   }
 }
 
+@keyframes slide-in {
+  from {
+    opacity: 0;
+    transform: translateX(100%) scale(0.95);
+  }
+  to {
+    opacity: 1;
+    transform: translateX(0) scale(1);
+  }
+}
+
 @keyframes float-up {
   0% {
     opacity: 1;
diff --git a/Frontend/src/main.jsx b/Frontend/src/main.jsx
index 6e3bf40..de8ffab 100755
--- a/Frontend/src/main.jsx
+++ b/Frontend/src/main.jsx
@@ -12,6 +12,7 @@ import Achievements from "./pages/Achievements";
 import Settings from "./pages/Settings";
 import Legal from "./pages/Legal";
 import Cookie from "./pages/Cookie";
+import Guide from "./pages/Guide";
 
 const router = createBrowserRouter([
   {
@@ -38,6 +39,10 @@ const router = createBrowserRouter([
         path: "/cookies",
         element: <Cookie />,
       },
+      {
+        path: "/guide",
+        element: <Guide />,
+      },
       {
         path: "/settings",
         element: <Settings />,
diff --git a/Frontend/src/pages/Guide.tsx b/Frontend/src/pages/Guide.tsx
new file mode 100644
index 0000000..2552428
--- /dev/null
+++ b/Frontend/src/pages/Guide.tsx
@@ -0,0 +1,105 @@
+// Guide.tsx — Guide joueur in-game
+
+export default function Guide() {
+  return (
+    <div className="container" style={{ color: "var(--color-grey)" }}>
+      <h1>Guide du Gardien</h1>
+
+      <div className="content">
+        <h2 className="subtitle">Le Marais</h2>
+        <p className="paragraphe">
+          Tu es le <strong>Gardien du Marais</strong>. Les tetards naissent sous tes clics,
+          grandissent grace a tes generateurs, et evoluent a chaque nouvelle generation.
+        </p>
+      </div>
+
+      <div className="content">
+        <h2 className="subtitle">Boucle de jeu</h2>
+        <p className="paragraphe">
+          <strong>1. Clique</strong> pour pondre des tetards. Achete des <strong>generateurs</strong> (Nid, Mare, Marecage...)
+          qui produisent des tetards automatiquement.
+        </p>
+        <p className="paragraphe">
+          <strong>2. Prestige</strong> quand tu atteins 1M de tetards. Tu perds tes tetards et generateurs,
+          mais tu gagnes de l'<strong>ADN Ancestral</strong> et un multiplicateur permanent.
+          Chaque generation est plus rapide que la precedente.
+        </p>
+        <p className="paragraphe">
+          <strong>3. Arbre d'Evolution</strong> — depense ton ADN dans 3 branches :
+        </p>
+        <ul className="paragraphe" style={{ marginLeft: "1.5rem" }}>
+          <li><strong>Ponte</strong> — booste tes clics, double ponte, critiques</li>
+          <li><strong>Marais</strong> — booste la production des generateurs</li>
+          <li><strong>Adaptation</strong> — bonus offline, ADN bonus, seuil prestige reduit</li>
+        </ul>
+        <p className="paragraphe">
+          Chaque branche a un <strong>capstone</strong> (noeud final puissant) et des
+          <strong> post-capstones</strong> achetables a l'infini pour une progression endless.
+        </p>
+      </div>
+
+      <div className="content">
+        <h2 className="subtitle">Capstones</h2>
+        <ul className="paragraphe" style={{ marginLeft: "1.5rem" }}>
+          <li><strong>Ponte Automatique</strong> — auto-click 1/s qui scale avec les upgrades</li>
+          <li><strong>Symbiose Totale</strong> — chaque type de generateur booste les autres</li>
+          <li><strong>Memoire du Marais</strong> — offline cap passe a 75%, duree 8h</li>
+        </ul>
+      </div>
+
+      <div className="content">
+        <h2 className="subtitle">Convergence</h2>
+        <p className="paragraphe">
+          Quand tu as debloque un capstone + des noeuds d'une 2e branche, tu peux acheter
+          <strong> Convergence Alpha</strong> (+10% a tous les effets).
+          Avec 2 capstones, elle evolue en <strong>Convergence Omega</strong> (-20% cout post-capstones).
+        </p>
+      </div>
+
+      <div className="content">
+        <h2 className="subtitle">Reset d'arbre</h2>
+        <p className="paragraphe">
+          Tu peux reinitialiser ton arbre pour tester d'autres builds.
+          <strong> 1 reset gratuit par prestige</strong>, puis 5 ADN par reset supplementaire.
+          L'ADN investi est entierement rembourse.
+        </p>
+      </div>
+
+      <div className="content">
+        <h2 className="subtitle">Milestones</h2>
+        <p className="paragraphe">
+          8 paliers de prestige (de 1 a 100) qui debloquent des <strong>cosmetiques exclusifs</strong> et
+          des <strong>bonus gameplay legers</strong> :
+        </p>
+        <ul className="paragraphe" style={{ marginLeft: "1.5rem" }}>
+          <li>1 prestige — Ruban queue</li>
+          <li>3 prestiges — Titre "Gardien Recurrent"</li>
+          <li>5 prestiges — 1 Nid gratuit au depart</li>
+          <li>10 prestiges — Couronne doree</li>
+          <li>15 prestiges — +5% offline permanent</li>
+          <li>25 prestiges — Cape d'algues ancestrales</li>
+          <li>50 prestiges — Queue enflamee + particules</li>
+          <li>100 prestiges — Skin Tetard Primordial</li>
+        </ul>
+      </div>
+
+      <div className="content">
+        <h2 className="subtitle">Cosmetiques</h2>
+        <p className="paragraphe">
+          Les cosmetiques sont purement visuels — <strong>zero pay-to-win</strong>.
+          Debloque-les via les achievements et les milestones prestige.
+          5 slots : chapeau, yeux, corps, queue, accessoire.
+        </p>
+      </div>
+
+      <div className="content">
+        <h2 className="subtitle">Offline</h2>
+        <p className="paragraphe">
+          Quand tu fermes le jeu, le marais continue de produire.
+          Efficacite : 100% les 15 premieres minutes, puis degressive jusqu'a 0% a 2h.
+          Les noeuds d'arbre et milestones peuvent augmenter le cap offline.
+        </p>
+      </div>
+    </div>
+  );
+}
diff --git a/Frontend/src/pages/Home.jsx b/Frontend/src/pages/Home.jsx
index f4cb265..5890090 100755
--- a/Frontend/src/pages/Home.jsx
+++ b/Frontend/src/pages/Home.jsx
@@ -160,7 +160,10 @@ export default function Home() {
         <EvolutionTree />
         <CosmeticsPanel />
         <a href="/achievements" className="achieve-badge">
-          {ACHIEVEMENTS.filter((a) => a.check(useGameStore.getState().state)).length}/{ACHIEVEMENTS.length} succès
+          {ACHIEVEMENTS.filter((a) => a.check(useGameStore.getState().state)).length}/{ACHIEVEMENTS.length} succes
+        </a>
+        <a href="/guide" className="achieve-badge" style={{ borderColor: "rgba(139, 92, 246, 0.2)", background: "rgba(139, 92, 246, 0.08)", color: "#a78bfa" }}>
+          Guide du Gardien
         </a>
       </aside>
     </main>
diff --git a/Frontend/src/store/useGameStore.ts b/Frontend/src/store/useGameStore.ts
index c05f732..fb49d47 100644
--- a/Frontend/src/store/useGameStore.ts
+++ b/Frontend/src/store/useGameStore.ts
@@ -25,6 +25,7 @@ import {
   offlineEfficiency,
 } from "../core/economy";
 import { migrateSave } from "../core/migrateSave";
+import { toast } from "./useToastStore";
 import {
   computeNewUnlocks,
   equipCosmetic as equipCosmeticFn,
@@ -180,6 +181,7 @@ export const useGameStore = create<GameStore>((set, get) => ({
         if (newUnlocks.length > 0) {
           const newCos = addToInventory(cosState, newUnlocks);
           updated.cosmeticInventory = newCos.inventory;
+          newUnlocks.forEach(() => toast("Nouveau cosmetique debloque !", "reward"));
         }
       }
 
@@ -228,7 +230,11 @@ export const useGameStore = create<GameStore>((set, get) => ({
     set((s) => {
       const updated = buyEvolutionNode(s.state, nodeId);
       if (!updated) return s;
+      const node = updated.evolutionTree.find((n) => n.id === nodeId);
       saveLocal(updated);
+      if (node?.capstone) {
+        toast(`Capstone debloque : ${node.name} !`, "reward", 5000);
+      }
       return {
         state: updated,
         productionPerSecond: totalProductionPerSecond(updated),
@@ -242,6 +248,7 @@ export const useGameStore = create<GameStore>((set, get) => ({
       if (!canPrestigeCheck(s.state)) return s;
       const updated = applyPrestige(s.state);
       saveLocal(updated);
+      toast(`Generation #${updated.prestigeCount} — Nouvelle vie !`, "success", 4000);
       return {
         state: updated,
         canPrestige: canPrestigeCheck(updated),
@@ -305,6 +312,7 @@ export const useGameStore = create<GameStore>((set, get) => ({
       const updated = claimMilestoneFn(s.state, milestoneId);
       if (!updated) return s;
       saveLocal(updated);
+      toast("Milestone debloque !", "reward", 4000);
       return { state: updated };
     });
   },
diff --git a/Frontend/src/store/useToastStore.ts b/Frontend/src/store/useToastStore.ts
new file mode 100644
index 0000000..fdcb0d5
--- /dev/null
+++ b/Frontend/src/store/useToastStore.ts
@@ -0,0 +1,48 @@
+// useToastStore.ts — Toast notification system
+// Stack de notifications auto-dismiss, utilisable partout via toast()
+
+import { create } from "zustand";
+
+export type ToastVariant = "success" | "info" | "reward" | "warning";
+
+export interface Toast {
+  id: number;
+  message: string;
+  variant: ToastVariant;
+  duration: number; // ms
+}
+
+let nextId = 0;
+
+interface ToastStore {
+  toasts: Toast[];
+  addToast: (message: string, variant?: ToastVariant, duration?: number) => void;
+  removeToast: (id: number) => void;
+}
+
+export const useToastStore = create<ToastStore>((set) => ({
+  toasts: [],
+
+  addToast: (message, variant = "info", duration = 3000) => {
+    const id = nextId++;
+    set((s) => ({
+      toasts: [...s.toasts, { id, message, variant, duration }],
+    }));
+    setTimeout(() => {
+      set((s) => ({
+        toasts: s.toasts.filter((t) => t.id !== id),
+      }));
+    }, duration);
+  },
+
+  removeToast: (id) => {
+    set((s) => ({
+      toasts: s.toasts.filter((t) => t.id !== id),
+    }));
+  },
+}));
+
+// Shorthand pour utiliser depuis n'importe où (pas besoin du hook)
+export function toast(message: string, variant?: ToastVariant, duration?: number) {
+  useToastStore.getState().addToast(message, variant, duration);
+}