diff --git a/apps/backend/app/main.py b/apps/backend/app/main.py
index de1235e..1380a84 100644
--- a/apps/backend/app/main.py
+++ b/apps/backend/app/main.py
@@ -1,9 +1,14 @@
 from collections.abc import AsyncIterator
 from contextlib import asynccontextmanager
+from pathlib import Path
 
 from fastapi import Depends, FastAPI
 from fastapi.middleware.cors import CORSMiddleware
+from fastapi.openapi.docs import get_redoc_html, get_swagger_ui_html
+from fastapi.staticfiles import StaticFiles
 from prometheus_fastapi_instrumentator import Instrumentator
+from starlette.requests import Request
+from starlette.responses import HTMLResponse
 
 from app.api.errors import register_error_handlers
 from app.api.middleware import SecurityHeadersMiddleware
@@ -18,6 +23,8 @@ logger = get_logger(__name__)
 
 METHODES_AUTORISEES = ["GET", "POST", "PATCH", "PUT", "DELETE", "OPTIONS"]
 EN_TETES_AUTORISES = ["Authorization", "Content-Type"]
+STATIC_DIR = Path(__file__).parent / "static"
+LOGO_URL = "/static/logo-icon.png"
 
 
 @asynccontextmanager
@@ -43,11 +50,41 @@ def create_app(settings: Settings | None = None) -> FastAPI:
         openapi_tags=TAGS,
         debug=resolved.debug,
         lifespan=lifespan,
-        docs_url="/docs" if documentee else None,
-        redoc_url="/redoc" if documentee else None,
+        docs_url=None,
+        redoc_url=None,
         openapi_url="/openapi.json" if documentee else None,
     )
 
+    if documentee:
+        application.mount("/static", StaticFiles(directory=STATIC_DIR), name="static")
+
+        # ReDoc supporte nativement `info.x-logo` (extension Redocly) pour afficher un logo
+        # en en-tête ; Swagger UI n'a pas d'equivalent, il ne reprend que le favicon.
+        openapi_original = application.openapi
+
+        def openapi_avec_logo() -> dict[str, object]:
+            schema = openapi_original()
+            schema["info"]["x-logo"] = {"url": LOGO_URL, "altText": "EnerVision"}
+            return schema
+
+        application.openapi = openapi_avec_logo  # type: ignore[method-assign]
+
+        @application.get("/docs", include_in_schema=False)
+        async def docs_swagger(_: Request) -> HTMLResponse:
+            return get_swagger_ui_html(
+                openapi_url="/openapi.json",
+                title=f"{application.title} · Swagger UI",
+                swagger_favicon_url=LOGO_URL,
+            )
+
+        @application.get("/redoc", include_in_schema=False)
+        async def docs_redoc(_: Request) -> HTMLResponse:
+            return get_redoc_html(
+                openapi_url="/openapi.json",
+                title=f"{application.title} · ReDoc",
+                redoc_favicon_url=LOGO_URL,
+            )
+
     application.add_middleware(SecurityHeadersMiddleware)
 
     if resolved.allowed_origins:
diff --git a/apps/backend/app/static/logo-icon.png b/apps/backend/app/static/logo-icon.png
new file mode 100644
index 0000000..d3bdc53
Binary files /dev/null and b/apps/backend/app/static/logo-icon.png differ
diff --git a/apps/backend/openapi.json b/apps/backend/openapi.json
index 3f414fa..25fc9ee 100644
--- a/apps/backend/openapi.json
+++ b/apps/backend/openapi.json
@@ -4,7 +4,11 @@
     "title": "EnerVision API",
     "summary": "Collecte, analyse et restitution de séries temporelles énergétiques.",
     "description": "\nToutes les routes sont préfixées par `/api/v1`.\n\n**Authentification.** Le jeton d'accès se présente dans l'en-tête `Authorization: Bearer ...`.\nLe jeton de rafraîchissement est un cookie `HttpOnly` que le code client ne voit jamais : il\nsuffit d'émettre les requêtes avec les identifiants de session. `POST /auth/refresh` rend un\nnouveau jeton d'accès et fait tourner le cookie.\n\n**Rôles.** `lecteur`, puis `operateur`, puis `admin`. Chaque rôle couvre les droits du\nprécédent.\n\n**Erreurs.** Le corps porte toujours une clé `detail`. Un `403` dont le `detail` vaut\n`password_change_required` n'est pas un refus de droits : il exige le changement du mot de passe\nprovisoire avant toute autre action.\n\nLe parcours de session complet est décrit dans\n`docs/architecture/31-contrat-authentification.md`.\n",
-    "version": "0.1.0"
+    "version": "0.1.0",
+    "x-logo": {
+      "url": "/static/logo-icon.png",
+      "altText": "EnerVision"
+    }
   },
   "paths": {
     "/api/v1/health/live": {
diff --git a/apps/backend/tests/api/test_route_protection.py b/apps/backend/tests/api/test_route_protection.py
index 734c9db..25e4760 100644
--- a/apps/backend/tests/api/test_route_protection.py
+++ b/apps/backend/tests/api/test_route_protection.py
@@ -81,3 +81,18 @@ async def test_the_declared_routes_are_actually_reachable(app: FastAPI) -> None:
 )
 def test_the_health_probes_stay_public(app: FastAPI, chemin: str) -> None:
     assert ("GET", chemin) in ROUTES_PUBLIQUES
+
+
+# Piège : ni les routes `include_in_schema=False` (/docs, /redoc) ni un `Mount` Starlette
+# (/static) n'apparaissent dans `app.openapi()["paths"]`. `routes_declarees()` ne les voit
+# donc jamais, et elles échapperaient silencieusement au garde-fou ci-dessus.
+@pytest.mark.parametrize(
+    "chemin",
+    ["/docs", "/redoc", "/static/logo-icon.png"],
+    ids=["swagger_ui", "redoc", "logo_statique"],
+)
+async def test_the_documentation_routes_are_public_by_design(
+    app: FastAPI, client: AsyncClient, chemin: str
+) -> None:
+    response = await client.get(chemin)
+    assert response.status_code == 200
diff --git a/apps/backend/tests/test_static_assets.py b/apps/backend/tests/test_static_assets.py
new file mode 100644
index 0000000..125ecda
--- /dev/null
+++ b/apps/backend/tests/test_static_assets.py
@@ -0,0 +1,13 @@
+# Piège : le logo est committé indépendamment à deux endroits (`app/static/`, servi par
+# `/docs`/`/redoc`, et `apps/frontend/public/`, servi au front) faute d'étape de build partagée.
+# Sans ce test, une mise à jour d'un seul des deux fichiers dérive silencieusement : rien en CI
+# ne le détecte.
+
+from pathlib import Path
+
+BACKEND_LOGO = Path(__file__).parent.parent / "app" / "static" / "logo-icon.png"
+FRONTEND_LOGO = Path(__file__).parent.parent.parent / "frontend" / "public" / "logo-icon.png"
+
+
+def test_the_backend_logo_stays_in_sync_with_the_frontend_one() -> None:
+    assert BACKEND_LOGO.read_bytes() == FRONTEND_LOGO.read_bytes()
diff --git a/apps/frontend/README.md b/apps/frontend/README.md
index aeaf788..c5b7484 100644
--- a/apps/frontend/README.md
+++ b/apps/frontend/README.md
@@ -76,6 +76,13 @@ Points à vérifier après toute regénération :
    côté backend. Le `docker-compose.yml` n'a aucun service frontend.
 4. Ajouter le `Dockerfile` multi-stage (build Angular puis service statique nginx).
 
+## Design système
+
+Tokens (couleurs, typo, espacements) et composants partagés (`ev-button`, `ev-card`,
+`ev-alert`, `ev-badge`) sont documentés dans
+[`docs/architecture/32-design-systeme-frontend.md`](../../docs/architecture/32-design-systeme-frontend.md).
+Toute nouvelle page doit les réutiliser plutôt que définir ses propres valeurs.
+
 ## Additional Resources
 
 For more information on using the Angular CLI, including detailed command references, visit the [Angular CLI Overview and Command Reference](https://angular.dev/tools/cli) page.
diff --git a/apps/frontend/public/favicon.ico b/apps/frontend/public/favicon.ico
index 57614f9..2b78d24 100644
Binary files a/apps/frontend/public/favicon.ico and b/apps/frontend/public/favicon.ico differ
diff --git a/apps/frontend/public/logo-icon.png b/apps/frontend/public/logo-icon.png
new file mode 100644
index 0000000..d3bdc53
Binary files /dev/null and b/apps/frontend/public/logo-icon.png differ
diff --git a/apps/frontend/src/app/features/auth/change-password/change-password.html b/apps/frontend/src/app/features/auth/change-password/change-password.html
index d7b5039..6c3de32 100644
--- a/apps/frontend/src/app/features/auth/change-password/change-password.html
+++ b/apps/frontend/src/app/features/auth/change-password/change-password.html
@@ -1,31 +1,38 @@
 <div class="auth-page">
-  <form class="auth-card" [formGroup]="form" (ngSubmit)="onSubmit()">
-    <h1>Nouveau mot de passe</h1>
-    <p class="auth-subtitle">Votre mot de passe est provisoire, vous devez le modifier avant de continuer</p>
+  <form class="auth-card-wrapper" [formGroup]="form" (ngSubmit)="onSubmit()">
+    <ev-card>
+      <ev-brand class="auth-brand" />
+      <h1>Nouveau mot de passe</h1>
+      <p class="auth-subtitle">
+        Votre mot de passe est provisoire, vous devez le modifier avant de continuer
+      </p>
 
-    <label for="current_password">Mot de passe actuel</label>
-    <input
-      id="current_password"
-      type="password"
-      formControlName="current_password"
-      autocomplete="current-password"
-    />
+      <label class="form-label" for="current_password">Mot de passe actuel</label>
+      <input
+        id="current_password"
+        class="form-input"
+        type="password"
+        formControlName="current_password"
+        autocomplete="current-password"
+      />
 
-    <label for="new_password">Nouveau mot de passe</label>
-    <input
-      id="new_password"
-      type="password"
-      formControlName="new_password"
-      autocomplete="new-password"
-    />
-    <span class="auth-hint">{{ passwordHint }}</span>
+      <label class="form-label" for="new_password">Nouveau mot de passe</label>
+      <input
+        id="new_password"
+        class="form-input"
+        type="password"
+        formControlName="new_password"
+        autocomplete="new-password"
+      />
+      <span class="form-hint">{{ passwordHint }}</span>
 
-    @if (errorMessage()) {
-      <p class="auth-error">{{ errorMessage() }}</p>
-    }
+      @if (errorMessage()) {
+        <ev-alert severity="danger">{{ errorMessage() }}</ev-alert>
+      }
 
-    <button type="submit" [disabled]="form.invalid || isLoading()">
-      {{ isLoading() ? 'Modification...' : 'Valider' }}
-    </button>
+      <ev-button type="submit" [disabled]="form.invalid || isLoading()">
+        {{ isLoading() ? 'Modification...' : 'Valider' }}
+      </ev-button>
+    </ev-card>
   </form>
 </div>
diff --git a/apps/frontend/src/app/features/auth/change-password/change-password.scss b/apps/frontend/src/app/features/auth/change-password/change-password.scss
index f44fcb8..e69de29 100644
--- a/apps/frontend/src/app/features/auth/change-password/change-password.scss
+++ b/apps/frontend/src/app/features/auth/change-password/change-password.scss
@@ -1,88 +0,0 @@
-:host {
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  min-height: 100vh;
-  background: #f3f4f6;
-  font-family: 'Segoe UI', system-ui, sans-serif;
-}
-
-.auth-card {
-  background: #ffffff;
-  border: 1px solid #e5e7eb;
-  border-radius: 12px;
-  padding: 2.5rem;
-  width: 100%;
-  max-width: 360px;
-  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
-  display: flex;
-  flex-direction: column;
-
-  h1 {
-    margin: 0;
-    font-size: 1.5rem;
-    font-weight: 700;
-    color: #1f2937;
-  }
-
-  .auth-subtitle {
-    margin: 0.25rem 0 1.5rem;
-    color: #6b7280;
-    font-size: 0.9rem;
-    line-height: 1.4;
-  }
-
-  label {
-    font-size: 0.85rem;
-    font-weight: 600;
-    color: #374151;
-    margin-bottom: 0.35rem;
-    margin-top: 1rem;
-  }
-
-  input {
-    padding: 0.6rem 0.75rem;
-    border: 1px solid #d1d5db;
-    border-radius: 8px;
-    font-size: 0.95rem;
-
-    &:focus {
-      outline: none;
-      border-color: #3b82f6;
-      box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
-    }
-  }
-
-  button {
-    margin-top: 1.5rem;
-    padding: 0.7rem;
-    background: #3b82f6;
-    color: #fff;
-    border: none;
-    border-radius: 8px;
-    font-size: 0.95rem;
-    font-weight: 600;
-    cursor: pointer;
-
-    &:disabled {
-      background: #9ca3af;
-      cursor: not-allowed;
-    }
-
-    &:not(:disabled):hover {
-      background: #2563eb;
-    }
-  }
-}
-
-.auth-hint {
-  font-size: 0.75rem;
-  color: #9ca3af;
-  margin-top: 0.25rem;
-}
-
-.auth-error {
-  margin: 0.75rem 0 0;
-  color: #dc2626;
-  font-size: 0.85rem;
-}
diff --git a/apps/frontend/src/app/features/auth/change-password/change-password.spec.ts b/apps/frontend/src/app/features/auth/change-password/change-password.spec.ts
index 0e72843..126e892 100644
--- a/apps/frontend/src/app/features/auth/change-password/change-password.spec.ts
+++ b/apps/frontend/src/app/features/auth/change-password/change-password.spec.ts
@@ -63,7 +63,7 @@ describe('ChangePassword', () => {
   fixture.detectChanges(); // rend le bloc @if (errorMessage())
 
   expect(component.errorMessage()).toContain('incorrect');
-  const errorEl = fixture.nativeElement.querySelector('.auth-error');
+  const errorEl = fixture.nativeElement.querySelector('.ev-alert');
   expect(errorEl?.textContent).toContain('incorrect');
   });
 
@@ -73,7 +73,7 @@ describe('ChangePassword', () => {
 
   const button = fixture.nativeElement.querySelector('button[type="submit"]');
   expect(button.disabled).toBe(true);
-  expect(fixture.nativeElement.querySelector('.auth-error')).toBeNull();
+  expect(fixture.nativeElement.querySelector('.ev-alert')).toBeNull();
   });
 
   it('déclenche onSubmit via la soumission réelle du formulaire (ngSubmit)', () => {
diff --git a/apps/frontend/src/app/features/auth/change-password/change-password.ts b/apps/frontend/src/app/features/auth/change-password/change-password.ts
index 528aea0..06be74d 100644
--- a/apps/frontend/src/app/features/auth/change-password/change-password.ts
+++ b/apps/frontend/src/app/features/auth/change-password/change-password.ts
@@ -2,12 +2,16 @@ import { Component, inject, signal } from '@angular/core';
 import { ReactiveFormsModule, FormBuilder, Validators } from '@angular/forms';
 import { Router } from '@angular/router';
 import { AuthService } from '../../../core/services/auth.service';
+import { Button } from '../../../shared/components/ui/button/button';
+import { Card } from '../../../shared/components/ui/card/card';
+import { Alert } from '../../../shared/components/ui/alert/alert';
+import { Brand } from '../../../shared/components/ui/brand/brand';
 import { passwordValidators, PASSWORD_HINT } from '../../../shared/validators/password.validator';
 
 @Component({
   selector: 'app-change-password',
   standalone: true,
-  imports: [ReactiveFormsModule],
+  imports: [ReactiveFormsModule, Button, Card, Alert, Brand],
   templateUrl: './change-password.html',
   styleUrl: './change-password.scss',
 })
@@ -36,7 +40,9 @@ export class ChangePassword {
       },
       error: () => {
         this.isLoading.set(false);
-        this.errorMessage.set(`Mot de passe actuel incorrect, ou nouveau mot de passe invalide (${this.passwordHint}).`);
+        this.errorMessage.set(
+          `Mot de passe actuel incorrect, ou nouveau mot de passe invalide (${this.passwordHint}).`,
+        );
       },
     });
   }
diff --git a/apps/frontend/src/app/features/auth/login/login.html b/apps/frontend/src/app/features/auth/login/login.html
index 3ee100b..cb802ca 100644
--- a/apps/frontend/src/app/features/auth/login/login.html
+++ b/apps/frontend/src/app/features/auth/login/login.html
@@ -1,38 +1,43 @@
 <div class="auth-page">
-  <form class="auth-card" [formGroup]="form" (ngSubmit)="onSubmit()">
-    <h1>Connexion</h1>
-    <p class="auth-subtitle">Accédez à votre espace EnerVision</p>
+  <form class="auth-card-wrapper" [formGroup]="form" (ngSubmit)="onSubmit()">
+    <ev-card>
+      <ev-brand class="auth-brand" />
+      <h1>Connexion</h1>
+      <p class="auth-subtitle">Accédez à votre espace EnerVision</p>
 
-    <label for="email">Email</label>
-    <input
-      id="email"
-      type="email"
-      formControlName="email"
-      autocomplete="username"
-      placeholder="vous@enervision.fr"
-    />
+      <label class="form-label" for="email">Email</label>
+      <input
+        id="email"
+        class="form-input"
+        type="email"
+        formControlName="email"
+        autocomplete="username"
+        placeholder="vous@enervision.fr"
+      />
 
-    <label for="password">Mot de passe</label>
-    <input
-      id="password"
-      type="password"
-      formControlName="password"
-      autocomplete="current-password"
-    />
+      <label class="form-label" for="password">Mot de passe</label>
+      <input
+        id="password"
+        class="form-input"
+        type="password"
+        formControlName="password"
+        autocomplete="current-password"
+      />
 
-    @if (errorMessage()) {
-      <p class="auth-error">
-        {{ errorMessage() }}
-        @if (retryAfterSeconds(); as seconds) {
-          (réessayez dans {{ seconds }}s)
-        }
-      </p>
-    }
+      @if (errorMessage()) {
+        <ev-alert severity="danger">
+          {{ errorMessage() }}
+          @if (retryAfterSeconds(); as seconds) {
+            (réessayez dans {{ seconds }}s)
+          }
+        </ev-alert>
+      }
 
-    <button type="submit" [disabled]="form.invalid || isLoading()">
-      {{ isLoading() ? 'Connexion...' : 'Se connecter' }}
-    </button>
+      <ev-button type="submit" [disabled]="form.invalid || isLoading()">
+        {{ isLoading() ? 'Connexion...' : 'Se connecter' }}
+      </ev-button>
 
-    <p class="auth-link"><a routerLink="/forgot-password">Mot de passe oublié ?</a></p>
+      <p class="auth-link"><a routerLink="/forgot-password">Mot de passe oublié ?</a></p>
+    </ev-card>
   </form>
 </div>
diff --git a/apps/frontend/src/app/features/auth/login/login.scss b/apps/frontend/src/app/features/auth/login/login.scss
index 45b28c0..f0ffb17 100644
--- a/apps/frontend/src/app/features/auth/login/login.scss
+++ b/apps/frontend/src/app/features/auth/login/login.scss
@@ -1,85 +1,3 @@
-:host {
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  min-height: 100vh;
-  background: #f3f4f6;
-  font-family: 'Segoe UI', system-ui, sans-serif;
-}
-
-.auth-card {
-  background: #ffffff;
-  border: 1px solid #e5e7eb;
-  border-radius: 12px;
-  padding: 2.5rem;
-  width: 100%;
-  max-width: 360px;
-  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
-  display: flex;
-  flex-direction: column;
-
-  h1 {
-    margin: 0;
-    font-size: 1.5rem;
-    font-weight: 700;
-    color: #1f2937;
-  }
-
-  .auth-subtitle {
-    margin: 0.25rem 0 1.5rem;
-    color: #6b7280;
-    font-size: 0.9rem;
-  }
-
-  label {
-    font-size: 0.85rem;
-    font-weight: 600;
-    color: #374151;
-    margin-bottom: 0.35rem;
-    margin-top: 1rem;
-  }
-
-  input {
-    padding: 0.6rem 0.75rem;
-    border: 1px solid #d1d5db;
-    border-radius: 8px;
-    font-size: 0.95rem;
-
-    &:focus {
-      outline: none;
-      border-color: #3b82f6;
-      box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
-    }
-  }
-
-  button {
-    margin-top: 1.5rem;
-    padding: 0.7rem;
-    background: #3b82f6;
-    color: #fff;
-    border: none;
-    border-radius: 8px;
-    font-size: 0.95rem;
-    font-weight: 600;
-    cursor: pointer;
-
-    &:disabled {
-      background: #9ca3af;
-      cursor: not-allowed;
-    }
-
-    &:not(:disabled):hover {
-      background: #2563eb;
-    }
-  }
-}
-
-.auth-error {
-  margin: 0.75rem 0 0;
-  color: #dc2626;
-  font-size: 0.85rem;
-}
-
 .auth-link {
   margin-top: 1rem;
   font-size: 0.85rem;
diff --git a/apps/frontend/src/app/features/auth/login/login.spec.ts b/apps/frontend/src/app/features/auth/login/login.spec.ts
index d100e5e..5c0ac6c 100644
--- a/apps/frontend/src/app/features/auth/login/login.spec.ts
+++ b/apps/frontend/src/app/features/auth/login/login.spec.ts
@@ -79,7 +79,7 @@ describe('Login', () => {
   fixture.detectChanges(); // rend le bloc @if (errorMessage()) du template
 
   expect(component.errorMessage()).toBe('Email ou mot de passe incorrect.');
-  const errorEl = fixture.nativeElement.querySelector('.auth-error');
+  const errorEl = fixture.nativeElement.querySelector('.ev-alert');
   expect(errorEl?.textContent).toContain('Email ou mot de passe incorrect.');
   });
 
@@ -96,7 +96,7 @@ describe('Login', () => {
     fixture.detectChanges(); // rend aussi le sous-bloc @if (retryAfterSeconds(); as seconds)
 
     expect(component.retryAfterSeconds()).toBe(30);
-    const errorEl = fixture.nativeElement.querySelector('.auth-error');
+    const errorEl = fixture.nativeElement.querySelector('.ev-alert');
     expect(errorEl?.textContent).toContain('30s');
   });
 
@@ -114,7 +114,7 @@ describe('Login', () => {
 
     const button = fixture.nativeElement.querySelector('button[type="submit"]');
     expect(button.disabled).toBe(true);
-    expect(fixture.nativeElement.querySelector('.auth-error')).toBeNull();
+    expect(fixture.nativeElement.querySelector('.ev-alert')).toBeNull();
   });
 
  it('déclenche onSubmit via la soumission réelle du formulaire (ngSubmit)', () => {
diff --git a/apps/frontend/src/app/features/auth/login/login.ts b/apps/frontend/src/app/features/auth/login/login.ts
index f9bd085..22fbe8d 100644
--- a/apps/frontend/src/app/features/auth/login/login.ts
+++ b/apps/frontend/src/app/features/auth/login/login.ts
@@ -3,12 +3,19 @@ import { ReactiveFormsModule, FormBuilder, Validators } from '@angular/forms';
 import { ActivatedRoute, Router, RouterLink } from '@angular/router';
 import { HttpErrorResponse } from '@angular/common/http';
 import { AuthService } from '../../../core/services/auth.service';
-import { MESSAGE_LIEN_RESET_INVALIDE, MOTIF_LIEN_RESET_INVALIDE } from '../../../shared/models/auth-redirect-reason';
+import { Button } from '../../../shared/components/ui/button/button';
+import { Card } from '../../../shared/components/ui/card/card';
+import { Alert } from '../../../shared/components/ui/alert/alert';
+import { Brand } from '../../../shared/components/ui/brand/brand';
+import {
+  MESSAGE_LIEN_RESET_INVALIDE,
+  MOTIF_LIEN_RESET_INVALIDE,
+} from '../../../shared/models/auth-redirect-reason';
 
 @Component({
   selector: 'app-login',
   standalone: true,
-  imports: [ReactiveFormsModule, RouterLink],
+  imports: [ReactiveFormsModule, RouterLink, Button, Card, Alert, Brand],
   templateUrl: './login.html',
   styleUrl: './login.scss',
 })
diff --git a/apps/frontend/src/app/features/dashboard/dashboard.html b/apps/frontend/src/app/features/dashboard/dashboard.html
index 684b444..6519fc9 100644
--- a/apps/frontend/src/app/features/dashboard/dashboard.html
+++ b/apps/frontend/src/app/features/dashboard/dashboard.html
@@ -1,19 +1,24 @@
 <div class="dashboard">
   <header class="dashboard__header">
-    <div>
-      <h1>Vue d'ensemble</h1>
-      <p class="dashboard__subtitle">Consommation instantanée du parc</p>
+    <div class="dashboard__brand">
+      <ev-brand class="dashboard__logo" />
+      <div>
+        <h1>Vue d'ensemble</h1>
+        <p class="dashboard__subtitle">Consommation instantanée du parc</p>
+      </div>
     </div>
-    <button type="button" class="logout-button" (click)="onLogout()">Déconnexion</button>
+    <ev-button class="logout-button" variant="secondary" [fullWidth]="false" (click)="onLogout()"
+      >Déconnexion</ev-button
+    >
   </header>
 
   @if (error(); as message) {
-    <p class="banner-error" role="alert">{{ message }}</p>
+    <ev-alert severity="danger" class="banner-error">{{ message }}</ev-alert>
   }
 
   @if (stats(); as s) {
     <section class="overview">
-      <div class="card card--gauge">
+      <ev-card class="card card--gauge">
         <span class="card__label">Consommation vs capacité</span>
         <app-consumption-gauge
           [consumption]="s.total_consumption_kw"
@@ -23,20 +28,20 @@
           >{{ s.total_consumption_kw | number: '1.0-1' }} /
           {{ s.total_capacity_kw | number }} kW</span
         >
-      </div>
+      </ev-card>
 
-      <div class="card">
+      <ev-card class="card">
         <span class="card__label">Charge moyenne du parc</span>
         <span class="card__value">{{ s.average_load_percent }} %</span>
         <div class="progress-bar">
           <div class="progress-bar__fill" [style.width.%]="s.average_load_percent"></div>
         </div>
-      </div>
+      </ev-card>
 
-      <div class="card">
+      <ev-card class="card">
         <span class="card__label">Sites suivis</span>
         <span class="card__value">{{ s.total_sites }}</span>
-      </div>
+      </ev-card>
     </section>
 
     <section class="chart-section">
@@ -50,8 +55,8 @@
       <h2>Alertes actives</h2>
       <ul class="alerts-list">
         @for (alert of alerts(); track alert.alert_id) {
-          <li class="alert-item" [class]="'alert-item--' + alert.severity">
-            <span class="alert-item__badge">{{ alert.severity }}</span>
+          <li class="alert-item">
+            <ev-badge [tone]="badgeToneForSeverity(alert.severity)">{{ alert.severity }}</ev-badge>
             <span class="alert-item__message">{{ alert.message }}</span>
           </li>
         }
diff --git a/apps/frontend/src/app/features/dashboard/dashboard.scss b/apps/frontend/src/app/features/dashboard/dashboard.scss
index 75976e1..715ce8c 100644
--- a/apps/frontend/src/app/features/dashboard/dashboard.scss
+++ b/apps/frontend/src/app/features/dashboard/dashboard.scss
@@ -1,23 +1,22 @@
 :host {
-  --color-good: #2e7d32;
-  --color-partial: #f9a825;
-  --color-degraded: #ef6c00;
-  --color-critical: #c62828;
-  --color-bg-card: #ffffff;
-  --color-border: #e5e7eb;
-  --color-text-muted: #6b7280;
-  --radius: 10px;
-
   display: block;
-  font-family: 'Segoe UI', system-ui, sans-serif;
-  color: #1f2937;
-  padding: 2rem;
+  color: var(--color-text);
+  padding: 2.5rem 2rem;
   max-width: 1100px;
   margin: 0 auto;
 }
 
 .dashboard__header {
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
   margin-bottom: 2rem;
+}
+
+.dashboard__brand {
+  display: flex;
+  align-items: center;
+  gap: 0.85rem;
 
   h1 {
     margin: 0;
@@ -26,6 +25,10 @@
   }
 }
 
+.dashboard__logo {
+  font-size: 1.3rem;
+}
+
 .dashboard__subtitle {
   margin: 0.25rem 0 0;
   color: var(--color-text-muted);
@@ -38,13 +41,8 @@ h2 {
 }
 
 .banner-error {
+  display: block;
   margin: 0 0 1.5rem;
-  padding: 0.75rem 1rem;
-  border: 1px solid var(--color-critical);
-  border-left-width: 4px;
-  border-radius: var(--radius);
-  background: #fdecea;
-  color: var(--color-critical);
 }
 
 .overview {
@@ -55,14 +53,8 @@ h2 {
 }
 
 .card {
-  background: var(--color-bg-card);
-  border: 1px solid var(--color-border);
-  border-radius: var(--radius);
   padding: 1.25rem;
-  display: flex;
-  flex-direction: column;
   gap: 0.35rem;
-  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
 }
 
 .card--gauge {
@@ -84,16 +76,16 @@ h2 {
 
 .progress-bar {
   height: 6px;
-  background: #e5e7eb;
-  border-radius: 999px;
+  background: var(--color-border-light);
+  border-radius: var(--radius-pill);
   overflow: hidden;
   margin-top: 0.25rem;
 }
 
 .progress-bar__fill {
   height: 100%;
-  background: #3b82f6;
-  border-radius: 999px;
+  background: var(--color-primary);
+  border-radius: var(--radius-pill);
   transition: width 0.3s ease;
 }
 
@@ -115,59 +107,11 @@ h2 {
   align-items: center;
   gap: 0.75rem;
   padding: 0.7rem 1rem;
-  border-radius: var(--radius);
-  background: #fef2f2;
-  border: 1px solid #fecaca;
-}
-
-.alert-item__badge {
-  font-size: 0.7rem;
-  font-weight: 700;
-  text-transform: uppercase;
-  padding: 0.2rem 0.55rem;
-  border-radius: 999px;
-  color: #fff;
-  background: var(--color-critical);
-  flex-shrink: 0;
-}
-
-.alert-item--high .alert-item__badge {
-  background: var(--color-degraded);
-}
-.alert-item--medium .alert-item__badge {
-  background: var(--color-partial);
-}
-.alert-item--low .alert-item__badge {
-  background: var(--color-good);
+  border-radius: var(--radius-md);
+  background: var(--color-danger-bg);
+  border: 1px solid var(--color-danger-border);
 }
 
 .alert-item__message {
   font-size: 0.9rem;
 }
-.dashboard__header {
-  display: flex;
-  align-items: flex-start;
-  justify-content: space-between;
-  margin-bottom: 2rem;
-
-  h1 {
-    margin: 0;
-    font-size: 1.75rem;
-    font-weight: 700;
-  }
-}
-
-.logout-button {
-  padding: 0.5rem 1rem;
-  background: #ffffff;
-  border: 1px solid #d1d5db;
-  border-radius: 8px;
-  font-size: 0.85rem;
-  font-weight: 600;
-  color: #374151;
-  cursor: pointer;
-
-  &:hover {
-    background: #f3f4f6;
-  }
-}
diff --git a/apps/frontend/src/app/features/dashboard/dashboard.spec.ts b/apps/frontend/src/app/features/dashboard/dashboard.spec.ts
index 5030b0d..4254945 100644
--- a/apps/frontend/src/app/features/dashboard/dashboard.spec.ts
+++ b/apps/frontend/src/app/features/dashboard/dashboard.spec.ts
@@ -148,4 +148,28 @@ describe('Dashboard', () => {
   expect(authMock.clearSession).toHaveBeenCalled();
   expect(routerMock.navigate).toHaveBeenCalledWith(['/login']);
 });
+
+  it('distingue le ton des sévérités high et critical', () => {
+    const statsMock = { getSummary: vi.fn().mockReturnValue(of({ total_sites: 7, sites: [] })) };
+    const alertsMock = { getAlerts: vi.fn().mockReturnValue(of([])) };
+
+    TestBed.configureTestingModule({
+      imports: [Dashboard],
+      providers: [
+        { provide: StatsService, useValue: statsMock },
+        { provide: AlertsService, useValue: alertsMock },
+      ],
+    });
+
+    const fixture = TestBed.createComponent(Dashboard);
+    const dashboard = fixture.componentInstance;
+
+    expect(dashboard.badgeToneForSeverity('low')).toBe('success');
+    expect(dashboard.badgeToneForSeverity('medium')).toBe('warning');
+    expect(dashboard.badgeToneForSeverity('high')).toBe('danger');
+    expect(dashboard.badgeToneForSeverity('critical')).toBe('critical');
+    expect(dashboard.badgeToneForSeverity('high')).not.toBe(
+      dashboard.badgeToneForSeverity('critical'),
+    );
+  });
 });
diff --git a/apps/frontend/src/app/features/dashboard/dashboard.ts b/apps/frontend/src/app/features/dashboard/dashboard.ts
index c6a6a56..b2137a1 100644
--- a/apps/frontend/src/app/features/dashboard/dashboard.ts
+++ b/apps/frontend/src/app/features/dashboard/dashboard.ts
@@ -9,16 +9,28 @@ import { SiteLoadChart } from '../../shared/components/site-load-chart/site-load
 import { AlertsService } from '../../core/services/alerts.service';
 import { AuthService } from '../../core/services/auth.service';
 import { StatsSummary } from '../../shared/models/stats.model';
-import { Alert } from '../../shared/models/alert.model';
+import { Alert, AlertSeverity } from '../../shared/models/alert.model';
+import { Card } from '../../shared/components/ui/card/card';
+import { Alert as EvAlert } from '../../shared/components/ui/alert/alert';
+import { Badge, BadgeTone } from '../../shared/components/ui/badge/badge';
+import { Brand } from '../../shared/components/ui/brand/brand';
+import { Button } from '../../shared/components/ui/button/button';
 
 const REFRESH_INTERVAL_MS = 10000;
 const UNAVAILABLE_MESSAGE =
   'Données indisponibles, les valeurs affichées datent du dernier relevé.';
 
+const TON_PAR_SEVERITE: Record<AlertSeverity, BadgeTone> = {
+  low: 'success',
+  medium: 'warning',
+  high: 'danger',
+  critical: 'critical',
+};
+
 @Component({
   selector: 'app-dashboard',
   standalone: true,
-  imports: [DecimalPipe, ConsumptionGauge, SiteLoadChart],
+  imports: [DecimalPipe, ConsumptionGauge, SiteLoadChart, Card, EvAlert, Badge, Brand, Button],
   templateUrl: './dashboard.html',
   styleUrl: './dashboard.scss',
 })
@@ -54,6 +66,10 @@ export class Dashboard implements OnInit {
       });
   }
 
+  badgeToneForSeverity(severity: AlertSeverity): BadgeTone {
+    return TON_PAR_SEVERITE[severity];
+  }
+
   onLogout(): void {
     this.auth.logout().subscribe({
       next: () => this.router.navigate(['/login']),
diff --git a/apps/frontend/src/app/shared/components/ui/alert/alert.html b/apps/frontend/src/app/shared/components/ui/alert/alert.html
new file mode 100644
index 0000000..6dbc743
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/alert/alert.html
@@ -0,0 +1 @@
+<ng-content></ng-content>
diff --git a/apps/frontend/src/app/shared/components/ui/alert/alert.scss b/apps/frontend/src/app/shared/components/ui/alert/alert.scss
new file mode 100644
index 0000000..21e7d6a
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/alert/alert.scss
@@ -0,0 +1,27 @@
+:host {
+  display: block;
+  margin: 0;
+  padding: 0.75rem 1rem;
+  border-radius: var(--radius-sm);
+  border: 1px solid transparent;
+  font-size: 0.85rem;
+  line-height: 1.4;
+}
+
+:host.ev-alert--success {
+  background: var(--color-success-bg);
+  border-color: var(--color-success);
+  color: var(--color-success);
+}
+
+:host.ev-alert--warning {
+  background: var(--color-warning-bg);
+  border-color: var(--color-warning);
+  color: var(--color-warning-text);
+}
+
+:host.ev-alert--danger {
+  background: var(--color-danger-bg);
+  border-color: var(--color-danger-border);
+  color: var(--color-danger);
+}
diff --git a/apps/frontend/src/app/shared/components/ui/alert/alert.spec.ts b/apps/frontend/src/app/shared/components/ui/alert/alert.spec.ts
new file mode 100644
index 0000000..cea6bd7
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/alert/alert.spec.ts
@@ -0,0 +1,30 @@
+import { Component } from '@angular/core';
+import { TestBed } from '@angular/core/testing';
+import { Alert } from './alert';
+
+@Component({
+  standalone: true,
+  imports: [Alert],
+  template: `<ev-alert severity="success">C'est fait</ev-alert>`,
+})
+class AlertHost {}
+
+describe('Alert', () => {
+  it('applique la classe danger par défaut', async () => {
+    await TestBed.configureTestingModule({ imports: [Alert] }).compileComponents();
+    const fixture = TestBed.createComponent(Alert);
+    fixture.detectChanges();
+
+    expect(fixture.nativeElement.classList).toContain('ev-alert--danger');
+  });
+
+  it('applique la sévérité demandée et projette le contenu', async () => {
+    await TestBed.configureTestingModule({ imports: [AlertHost] }).compileComponents();
+    const fixture = TestBed.createComponent(AlertHost);
+    fixture.detectChanges();
+
+    const el = fixture.nativeElement.querySelector('.ev-alert');
+    expect(el.classList).toContain('ev-alert--success');
+    expect(el.textContent).toContain("C'est fait");
+  });
+});
diff --git a/apps/frontend/src/app/shared/components/ui/alert/alert.ts b/apps/frontend/src/app/shared/components/ui/alert/alert.ts
new file mode 100644
index 0000000..45e030f
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/alert/alert.ts
@@ -0,0 +1,21 @@
+import { Component, HostBinding, input } from '@angular/core';
+
+export type AlertSeverity = 'success' | 'warning' | 'danger';
+
+@Component({
+  selector: 'ev-alert',
+  standalone: true,
+  templateUrl: './alert.html',
+  styleUrl: './alert.scss',
+})
+export class Alert {
+  severity = input<AlertSeverity>('danger');
+
+  @HostBinding('class')
+  get hostClass(): string {
+    return `ev-alert ev-alert--${this.severity()}`;
+  }
+
+  @HostBinding('attr.role')
+  readonly role = 'alert';
+}
diff --git a/apps/frontend/src/app/shared/components/ui/badge/badge.html b/apps/frontend/src/app/shared/components/ui/badge/badge.html
new file mode 100644
index 0000000..9dd0cd5
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/badge/badge.html
@@ -0,0 +1,3 @@
+<span class="ev-badge" [class]="'ev-badge--' + tone()">
+  <ng-content></ng-content>
+</span>
diff --git a/apps/frontend/src/app/shared/components/ui/badge/badge.scss b/apps/frontend/src/app/shared/components/ui/badge/badge.scss
new file mode 100644
index 0000000..00c7b7d
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/badge/badge.scss
@@ -0,0 +1,35 @@
+:host {
+  display: inline-flex;
+  flex-shrink: 0;
+}
+
+.ev-badge {
+  display: inline-block;
+  font-size: 0.7rem;
+  font-weight: 700;
+  text-transform: uppercase;
+  letter-spacing: 0.02em;
+  padding: 0.2rem 0.55rem;
+  border-radius: var(--radius-pill);
+  color: var(--color-text-inverse);
+}
+
+.ev-badge--success {
+  background: var(--color-success);
+}
+
+.ev-badge--warning {
+  background: var(--color-warning);
+}
+
+.ev-badge--danger {
+  background: var(--color-danger);
+}
+
+.ev-badge--critical {
+  background: var(--color-critical);
+}
+
+.ev-badge--neutral {
+  background: var(--color-text-muted);
+}
diff --git a/apps/frontend/src/app/shared/components/ui/badge/badge.spec.ts b/apps/frontend/src/app/shared/components/ui/badge/badge.spec.ts
new file mode 100644
index 0000000..09e1a25
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/badge/badge.spec.ts
@@ -0,0 +1,30 @@
+import { Component } from '@angular/core';
+import { TestBed } from '@angular/core/testing';
+import { Badge } from './badge';
+
+@Component({
+  standalone: true,
+  imports: [Badge],
+  template: `<ev-badge tone="danger">critique</ev-badge>`,
+})
+class BadgeHost {}
+
+describe('Badge', () => {
+  it('applique le ton neutral par défaut', async () => {
+    await TestBed.configureTestingModule({ imports: [Badge] }).compileComponents();
+    const fixture = TestBed.createComponent(Badge);
+    fixture.detectChanges();
+
+    expect(fixture.nativeElement.querySelector('.ev-badge').classList).toContain('ev-badge--neutral');
+  });
+
+  it('applique le ton demandé et projette le contenu', async () => {
+    await TestBed.configureTestingModule({ imports: [BadgeHost] }).compileComponents();
+    const fixture = TestBed.createComponent(BadgeHost);
+    fixture.detectChanges();
+
+    const el = fixture.nativeElement.querySelector('.ev-badge');
+    expect(el.classList).toContain('ev-badge--danger');
+    expect(el.textContent).toContain('critique');
+  });
+});
diff --git a/apps/frontend/src/app/shared/components/ui/badge/badge.ts b/apps/frontend/src/app/shared/components/ui/badge/badge.ts
new file mode 100644
index 0000000..e08ac82
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/badge/badge.ts
@@ -0,0 +1,13 @@
+import { Component, input } from '@angular/core';
+
+export type BadgeTone = 'success' | 'warning' | 'danger' | 'critical' | 'neutral';
+
+@Component({
+  selector: 'ev-badge',
+  standalone: true,
+  templateUrl: './badge.html',
+  styleUrl: './badge.scss',
+})
+export class Badge {
+  tone = input<BadgeTone>('neutral');
+}
diff --git a/apps/frontend/src/app/shared/components/ui/brand/brand.html b/apps/frontend/src/app/shared/components/ui/brand/brand.html
new file mode 100644
index 0000000..7c4e599
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/brand/brand.html
@@ -0,0 +1,2 @@
+<img src="/logo-icon.png" alt="" class="ev-brand__icon" />
+<span class="ev-brand__name">EnerVision</span>
diff --git a/apps/frontend/src/app/shared/components/ui/brand/brand.scss b/apps/frontend/src/app/shared/components/ui/brand/brand.scss
new file mode 100644
index 0000000..3303909
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/brand/brand.scss
@@ -0,0 +1,19 @@
+:host {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.45em;
+  font-size: 1.5rem;
+  font-weight: 700;
+  color: var(--color-text);
+  line-height: 1;
+}
+
+.ev-brand__icon {
+  height: 1.3em;
+  width: auto;
+  flex-shrink: 0;
+}
+
+.ev-brand__name {
+  white-space: nowrap;
+}
diff --git a/apps/frontend/src/app/shared/components/ui/brand/brand.spec.ts b/apps/frontend/src/app/shared/components/ui/brand/brand.spec.ts
new file mode 100644
index 0000000..7a6b16f
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/brand/brand.spec.ts
@@ -0,0 +1,14 @@
+import { TestBed } from '@angular/core/testing';
+import { Brand } from './brand';
+
+describe('Brand', () => {
+  it("affiche l'icône et le nom EnerVision", async () => {
+    await TestBed.configureTestingModule({ imports: [Brand] }).compileComponents();
+    const fixture = TestBed.createComponent(Brand);
+    fixture.detectChanges();
+
+    const icon = fixture.nativeElement.querySelector('img.ev-brand__icon');
+    expect(icon).toBeTruthy();
+    expect(fixture.nativeElement.textContent).toContain('EnerVision');
+  });
+});
diff --git a/apps/frontend/src/app/shared/components/ui/brand/brand.ts b/apps/frontend/src/app/shared/components/ui/brand/brand.ts
new file mode 100644
index 0000000..55f5706
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/brand/brand.ts
@@ -0,0 +1,9 @@
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'ev-brand',
+  standalone: true,
+  templateUrl: './brand.html',
+  styleUrl: './brand.scss',
+})
+export class Brand {}
diff --git a/apps/frontend/src/app/shared/components/ui/button/button.html b/apps/frontend/src/app/shared/components/ui/button/button.html
new file mode 100644
index 0000000..4cf5a67
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/button/button.html
@@ -0,0 +1,9 @@
+<button
+  [type]="type()"
+  class="ev-button"
+  [class]="'ev-button--' + variant()"
+  [class.ev-button--inline]="!fullWidth()"
+  [disabled]="disabled()"
+>
+  <ng-content></ng-content>
+</button>
diff --git a/apps/frontend/src/app/shared/components/ui/button/button.scss b/apps/frontend/src/app/shared/components/ui/button/button.scss
new file mode 100644
index 0000000..8fe3753
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/button/button.scss
@@ -0,0 +1,55 @@
+.ev-button {
+  width: 100%;
+  padding: 0.7rem;
+  border: none;
+  border-radius: var(--radius-sm);
+  font-size: 0.95rem;
+  font-weight: 600;
+  font-family: var(--font-family);
+  cursor: pointer;
+
+  &:disabled {
+    cursor: not-allowed;
+    opacity: 0.7;
+  }
+
+  &.ev-button--inline {
+    width: auto;
+  }
+}
+
+.ev-button--primary {
+  background: var(--color-primary);
+  color: var(--color-text-inverse);
+
+  &:disabled {
+    background: var(--color-disabled);
+  }
+
+  &:not(:disabled):hover {
+    background: var(--color-primary-hover);
+  }
+}
+
+.ev-button--secondary {
+  background: var(--color-surface);
+  border: 1px solid var(--color-border);
+  color: var(--color-label);
+
+  &:not(:disabled):hover {
+    background: var(--color-bg);
+  }
+}
+
+.ev-button--danger {
+  background: var(--color-danger);
+  color: var(--color-text-inverse);
+
+  &:disabled {
+    background: var(--color-disabled);
+  }
+
+  &:not(:disabled):hover {
+    background: var(--color-danger-hover);
+  }
+}
diff --git a/apps/frontend/src/app/shared/components/ui/button/button.spec.ts b/apps/frontend/src/app/shared/components/ui/button/button.spec.ts
new file mode 100644
index 0000000..8362cdc
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/button/button.spec.ts
@@ -0,0 +1,50 @@
+import { Component } from '@angular/core';
+import { TestBed } from '@angular/core/testing';
+import { Button } from './button';
+
+@Component({
+  standalone: true,
+  imports: [Button],
+  template: `<ev-button>Valider</ev-button>`,
+})
+class ButtonHost {}
+
+describe('Button', () => {
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({ imports: [Button] }).compileComponents();
+  });
+
+  it('applique la classe de la variante primary par défaut', () => {
+    const fixture = TestBed.createComponent(Button);
+    fixture.detectChanges();
+
+    const button = fixture.nativeElement.querySelector('button');
+    expect(button.classList).toContain('ev-button--primary');
+  });
+
+  it('applique la classe de la variante demandée', () => {
+    const fixture = TestBed.createComponent(Button);
+    fixture.componentRef.setInput('variant', 'danger');
+    fixture.detectChanges();
+
+    const button = fixture.nativeElement.querySelector('button');
+    expect(button.classList).toContain('ev-button--danger');
+  });
+
+  it('désactive le bouton natif quand disabled est vrai', () => {
+    const fixture = TestBed.createComponent(Button);
+    fixture.componentRef.setInput('disabled', true);
+    fixture.detectChanges();
+
+    const button = fixture.nativeElement.querySelector('button');
+    expect(button.disabled).toBe(true);
+  });
+
+  it('projette le contenu', async () => {
+    await TestBed.configureTestingModule({ imports: [ButtonHost] }).compileComponents();
+    const fixture = TestBed.createComponent(ButtonHost);
+    fixture.detectChanges();
+
+    expect(fixture.nativeElement.querySelector('button').textContent).toContain('Valider');
+  });
+});
diff --git a/apps/frontend/src/app/shared/components/ui/button/button.ts b/apps/frontend/src/app/shared/components/ui/button/button.ts
new file mode 100644
index 0000000..c7b3148
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/button/button.ts
@@ -0,0 +1,16 @@
+import { Component, input } from '@angular/core';
+
+export type ButtonVariant = 'primary' | 'secondary' | 'danger';
+
+@Component({
+  selector: 'ev-button',
+  standalone: true,
+  templateUrl: './button.html',
+  styleUrl: './button.scss',
+})
+export class Button {
+  variant = input<ButtonVariant>('primary');
+  type = input<'button' | 'submit'>('button');
+  disabled = input(false);
+  fullWidth = input(true);
+}
diff --git a/apps/frontend/src/app/shared/components/ui/card/card.html b/apps/frontend/src/app/shared/components/ui/card/card.html
new file mode 100644
index 0000000..6dbc743
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/card/card.html
@@ -0,0 +1 @@
+<ng-content></ng-content>
diff --git a/apps/frontend/src/app/shared/components/ui/card/card.scss b/apps/frontend/src/app/shared/components/ui/card/card.scss
new file mode 100644
index 0000000..09307fb
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/card/card.scss
@@ -0,0 +1,10 @@
+:host {
+  background: var(--color-surface);
+  border: 1px solid var(--color-border-light);
+  border-radius: var(--radius-md);
+  padding: var(--space-5);
+  box-shadow: var(--shadow-card);
+  display: flex;
+  flex-direction: column;
+  box-sizing: border-box;
+}
diff --git a/apps/frontend/src/app/shared/components/ui/card/card.spec.ts b/apps/frontend/src/app/shared/components/ui/card/card.spec.ts
new file mode 100644
index 0000000..cea71d9
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/card/card.spec.ts
@@ -0,0 +1,22 @@
+import { Component } from '@angular/core';
+import { TestBed } from '@angular/core/testing';
+import { Card } from './card';
+
+@Component({
+  standalone: true,
+  imports: [Card],
+  template: `<ev-card><p>Contenu</p></ev-card>`,
+})
+class CardHost {}
+
+describe('Card', () => {
+  it('projette son contenu', async () => {
+    await TestBed.configureTestingModule({ imports: [CardHost] }).compileComponents();
+    const fixture = TestBed.createComponent(CardHost);
+    fixture.detectChanges();
+
+    const card = fixture.nativeElement.querySelector('ev-card');
+    expect(card).toBeTruthy();
+    expect(card.textContent).toContain('Contenu');
+  });
+});
diff --git a/apps/frontend/src/app/shared/components/ui/card/card.ts b/apps/frontend/src/app/shared/components/ui/card/card.ts
new file mode 100644
index 0000000..50c496c
--- /dev/null
+++ b/apps/frontend/src/app/shared/components/ui/card/card.ts
@@ -0,0 +1,9 @@
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'ev-card',
+  standalone: true,
+  templateUrl: './card.html',
+  styleUrl: './card.scss',
+})
+export class Card {}
diff --git a/apps/frontend/src/index.html b/apps/frontend/src/index.html
index 71cdfcc..2c75ae4 100644
--- a/apps/frontend/src/index.html
+++ b/apps/frontend/src/index.html
@@ -2,10 +2,10 @@
 <html lang="en">
   <head>
     <meta charset="utf-8" />
-    <title>Frontend</title>
+    <title>EnerVision</title>
     <base href="/" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <link rel="icon" type="image/x-icon" href="favicon.ico" />
+    <link rel="icon" type="image/x-icon" href="/favicon.ico" />
   </head>
   <body>
     <app-root></app-root>
diff --git a/apps/frontend/src/styles.scss b/apps/frontend/src/styles.scss
index 90d4ee0..3e162eb 100644
--- a/apps/frontend/src/styles.scss
+++ b/apps/frontend/src/styles.scss
@@ -1 +1,10 @@
-/* You can add global styles to this file, and also import other style files */
+@use 'styles/tokens';
+@use 'styles/forms';
+@use 'styles/auth-page';
+
+body {
+  margin: 0;
+  font-family: var(--font-family);
+  color: var(--color-text);
+  background: var(--color-bg);
+}
diff --git a/apps/frontend/src/styles/_auth-page.scss b/apps/frontend/src/styles/_auth-page.scss
new file mode 100644
index 0000000..be4c566
--- /dev/null
+++ b/apps/frontend/src/styles/_auth-page.scss
@@ -0,0 +1,57 @@
+.auth-page {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  min-height: 100vh;
+  padding: var(--space-4);
+  box-sizing: border-box;
+  background:
+    radial-gradient(circle at 15% 10%, var(--color-primary-light) 0%, transparent 45%),
+    radial-gradient(circle at 85% 90%, var(--color-primary-light) 0%, transparent 40%),
+    var(--color-bg);
+}
+
+.auth-card-wrapper {
+  width: 100%;
+  max-width: 420px;
+
+  ev-card {
+    padding: 3rem 2.5rem;
+    box-shadow:
+      0 20px 25px -5px rgba(0, 0, 0, 0.06),
+      0 8px 10px -6px rgba(0, 0, 0, 0.04);
+  }
+
+  .auth-brand {
+    justify-content: center;
+    width: 100%;
+    font-size: 2.1rem;
+    margin-bottom: 1.75rem;
+  }
+
+  h1 {
+    margin: 0;
+    font-size: 1.85rem;
+    font-weight: 700;
+    color: var(--color-text);
+    text-align: center;
+  }
+
+  .auth-subtitle {
+    margin: 0.4rem 0 2rem;
+    color: var(--color-text-muted);
+    font-size: 0.95rem;
+    line-height: 1.4;
+    text-align: center;
+  }
+
+  ev-alert {
+    display: block;
+    margin-top: 0.75rem;
+  }
+
+  ev-button {
+    display: block;
+    margin-top: 1.75rem;
+  }
+}
diff --git a/apps/frontend/src/styles/_forms.scss b/apps/frontend/src/styles/_forms.scss
new file mode 100644
index 0000000..9bbfb0c
--- /dev/null
+++ b/apps/frontend/src/styles/_forms.scss
@@ -0,0 +1,31 @@
+.form-label {
+  display: block;
+  font-size: 0.85rem;
+  font-weight: 600;
+  color: var(--color-label);
+  margin-bottom: var(--space-1);
+  margin-top: var(--space-3);
+}
+
+.form-input {
+  width: 100%;
+  padding: var(--space-2) 0.75rem;
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-sm);
+  font-size: 0.95rem;
+  font-family: var(--font-family);
+  box-sizing: border-box;
+
+  &:focus {
+    outline: none;
+    border-color: var(--color-primary);
+    box-shadow: 0 0 0 3px rgba(22, 163, 74, 0.15);
+  }
+}
+
+.form-hint {
+  display: block;
+  font-size: 0.75rem;
+  color: var(--color-disabled);
+  margin-top: 0.25rem;
+}
diff --git a/apps/frontend/src/styles/_tokens.scss b/apps/frontend/src/styles/_tokens.scss
new file mode 100644
index 0000000..2e7663b
--- /dev/null
+++ b/apps/frontend/src/styles/_tokens.scss
@@ -0,0 +1,43 @@
+:root {
+  // Marque (dérivé du logo : vert feuille/éclair, halo)
+  --color-primary: #16a34a;
+  --color-primary-hover: #15803d;
+  --color-primary-light: #dcfce7;
+
+  // Neutres (texte, bordures, fonds)
+  --color-text: #1f2937;
+  --color-text-muted: #6b7280;
+  --color-label: #374151;
+  --color-border: #d1d5db;
+  --color-border-light: #e5e7eb;
+  --color-bg: #f3f4f6;
+  --color-surface: #ffffff;
+  --color-disabled: #9ca3af;
+
+  // Sémantique (statuts, alertes)
+  --color-success: #16a34a;
+  --color-success-bg: #dcfce7;
+  --color-warning: #f9a825;
+  --color-warning-bg: #fef9e7;
+  --color-danger: #dc2626;
+  --color-danger-hover: #b91c1c;
+  --color-danger-bg: #fef2f2;
+  --color-danger-border: #fecaca;
+  --color-critical: #b91c1c;
+  --color-warning-text: #92400e;
+  --color-text-inverse: #ffffff;
+
+  // Typo, rayons, ombre
+  --font-family: 'Segoe UI', system-ui, sans-serif;
+  --radius-sm: 8px;
+  --radius-md: 12px;
+  --radius-pill: 999px;
+  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06);
+
+  // Espacements
+  --space-1: 0.35rem;
+  --space-2: 0.6rem;
+  --space-3: 1rem;
+  --space-4: 1.5rem;
+  --space-5: 2.5rem;
+}
diff --git a/docs/architecture/30-frontend.md b/docs/architecture/30-frontend.md
index 3c361e5..de73599 100644
--- a/docs/architecture/30-frontend.md
+++ b/docs/architecture/30-frontend.md
@@ -16,6 +16,10 @@ Ce qui est en place :
 - `core/services` porte `StatsService` et `AlertsService`, `core/interceptors` l'intercepteur de
   fixtures, `features/dashboard` la page, `shared/components` la jauge de consommation et le
   graphique de charge par site, tous deux construits sur Chart.js.
+- Un système de design partagé (`shared/components/ui/` : `ev-button`, `ev-card`, `ev-alert`,
+  `ev-badge`, `ev-brand`, tokens CSS dans `styles/_tokens.scss`) que toute nouvelle page doit
+  réutiliser plutôt que redéfinir ses propres styles. Détail :
+  [32-design-systeme-frontend.md](32-design-systeme-frontend.md).
 - L'état vit dans des signaux, sans bibliothèque dédiée.
 - Vitest via le builder `@angular/build:unit-test`, couverture activée, sept fichiers de test.
 - Prettier configuré, parser `angular` pour les gabarits HTML.
diff --git a/docs/architecture/32-design-systeme-frontend.md b/docs/architecture/32-design-systeme-frontend.md
new file mode 100644
index 0000000..3d1c442
--- /dev/null
+++ b/docs/architecture/32-design-systeme-frontend.md
@@ -0,0 +1,96 @@
+# Design système frontend
+
+Ce que toute nouvelle page ou tout nouveau composant Angular doit réutiliser, plutôt que
+redéfinir ses propres couleurs, rayons ou espacements en dur. Contexte : issue
+[#91](https://github.com/ineszang/ProjetPiscine_EnerVision/issues/91), née d'une incohérence
+visuelle accumulée page après page (aucun jeton partagé n'existait avant ce chantier).
+
+## Tokens
+
+Déclarés en CSS custom properties dans `apps/frontend/src/styles/_tokens.scss`, importés une
+seule fois dans `src/styles.scss`. Disponibles partout sans import supplémentaire.
+
+| Variable | Rôle |
+|---|---|
+| `--color-primary`, `--color-primary-hover`, `--color-primary-light` | Couleur de marque (vert, dérivé du logo), actions principales |
+| `--color-text`, `--color-text-muted`, `--color-label` | Hiérarchie de texte (titres, texte secondaire, labels de formulaire) |
+| `--color-border`, `--color-border-light` | Bordures d'inputs et de cartes |
+| `--color-bg`, `--color-surface` | Fond de page vs fond des cartes/panneaux |
+| `--color-disabled` | Éléments désactivés |
+| `--color-success` / `-bg`, `--color-warning` / `-bg` / `-text`, `--color-danger` / `-hover` / `-bg` / `-border`, `--color-critical` | États sémantiques (alertes, badges) |
+| `--color-text-inverse` | Texte sur fond coloré plein (boutons/badges) |
+| `--font-family` | Police unique de l'application |
+| `--radius-sm`, `--radius-md`, `--radius-pill` | Rayons de bordure (input/bouton, carte, pastille) |
+| `--shadow-card` | Ombre portée des cartes |
+| `--space-1` à `--space-5` | Échelle d'espacement (0.35rem à 2.5rem) |
+
+Les classes de formulaire partagées (`.form-label`, `.form-input`, `.form-hint`) sont dans
+`apps/frontend/src/styles/_forms.scss`, importées globalement de la même façon. Elles
+s'appliquent directement à des `<label>`/`<input>` natifs liés par `formControlName` : pas de
+composant `ControlValueAccessor` dédié, le gain n'en vaut pas la complexité pour des formulaires
+aussi simples que ceux de ce projet. Les erreurs de formulaire, elles, s'affichent via
+`<ev-alert severity="danger">`, pas une classe dédiée.
+
+La classe `.auth-page` (`apps/frontend/src/styles/_auth-page.scss`, importée globalement) porte
+le fond dégradé et le centrage commun aux pages d'authentification (`login`, `change-password`,
+et à terme `forgot-password`/`reset-password`) : elle enveloppe la carte, pas de duplication du
+fond par page.
+
+## Composants partagés
+
+Dans `apps/frontend/src/app/shared/components/ui/`, chacun standalone, à importer directement
+dans le tableau `imports` du composant qui l'utilise.
+
+- **`<ev-button>`** (`button/`) : `variant` (`primary` / `secondary` / `danger`, défaut
+  `primary`), `type` (`button` / `submit`, défaut `button`), `disabled`, `fullWidth` (défaut
+  `true` ; passer `false` pour un bouton qui ne doit pas occuper toute la largeur de son
+  conteneur, ex. une action isolée dans un en-tête).
+  ```html
+  <ev-button type="submit" [disabled]="form.invalid">Valider</ev-button>
+  <ev-button variant="secondary" [fullWidth]="false">Déconnexion</ev-button>
+  ```
+- **`<ev-card>`** (`card/`) : conteneur à padding/rayon/ombre standard, sans input, tout est le
+  contenu projeté (`<ng-content>`). Le style vit sur `:host` : une classe externe passée par le
+  parent (`<ev-card class="ma-classe">`) se combine avec le style du composant sans le masquer.
+  ```html
+  <ev-card><h1>Titre</h1></ev-card>
+  ```
+- **`<ev-alert>`** (`alert/`) : `severity` (`success` / `warning` / `danger`, défaut `danger`),
+  `role="alert"` posé automatiquement. Même principe de style sur `:host`.
+  ```html
+  <ev-alert severity="danger">Erreur : {{ message }}</ev-alert>
+  ```
+- **`<ev-badge>`** (`badge/`) : `tone` (`success` / `warning` / `danger` / `critical` /
+  `neutral`, défaut `neutral`), pastille à bord arrondi pour un statut court. `danger` et
+  `critical` sont deux rouges distincts (`--color-danger` vs `--color-critical`, plus sombre) :
+  une sévérité `critical` ne doit pas se confondre visuellement avec une `high`.
+  ```html
+  <ev-badge tone="danger">critique</ev-badge>
+  ```
+- **`<ev-brand>`** (`brand/`) : lockup icône + « EnerVision », sans input. La taille se pilote
+  entièrement via `font-size` (l'icône et le texte sont exprimés en `em`, donc ils grossissent
+  ensemble en gardant le même écart proportionnel) : une page l'agrandit simplement avec
+  `ev-brand { font-size: 2.1rem; }`. Ne pas recomposer icône + texte en une seule image bitmap :
+  un essai en ce sens (recadrage pixel de l'asset source) a produit un rendu bruité et un espacement
+  figé, impossible à ajuster proprement.
+  ```html
+  <ev-brand />
+  ```
+
+## Logo
+
+L'icône seule (sans le mot-symbole), recadrée depuis l'asset source du projet, vit à deux
+endroits qui doivent rester synchronisés si le logo change un jour :
+`apps/frontend/public/logo-icon.png` (utilisée par `<ev-brand>`) et
+`apps/backend/app/static/logo-icon.png` (référencée par `/docs`, favicon Swagger, et `/redoc` via
+l'extension `x-logo` du schéma OpenAPI, voir `app/main.py`). Le mot-symbole « EnerVision » n'est
+jamais une image : c'est le texte du composant `<ev-brand>`, en police système.
+
+Le favicon `apps/frontend/public/favicon.ico` est généré depuis la même icône (multi-tailles
+16 à 256px).
+
+## Règle pour toute nouvelle page
+
+Utiliser les tokens et les composants ci-dessus plutôt que des valeurs en dur (couleurs
+hexadécimales, rayons, espacements). Étendre ce document si un nouveau composant partagé est
+créé.
diff --git a/docs/architecture/README.md b/docs/architecture/README.md
index 1c8c9a9..78a82c9 100644
--- a/docs/architecture/README.md
+++ b/docs/architecture/README.md
@@ -13,6 +13,7 @@ contredisent, c'est l'ADR qui fait foi et la vue qui est en retard.
 | [20-backend.md](20-backend.md) | Couches FastAPI, séquence de démarrage, routes, configuration, contrat OpenAPI |
 | [30-frontend.md](30-frontend.md) | Angular, arborescence cible, flux HTTP |
 | [31-contrat-authentification.md](31-contrat-authentification.md) | Ce que le frontend doit savoir pour coder la connexion |
+| [32-design-systeme-frontend.md](32-design-systeme-frontend.md) | Tokens CSS, composants `ev-*` partagés, règle anti-couleur-en-dur |
 | [40-data.md](40-data.md) | Frontières `db/` et `alembic/`, cycle de vie d'une mesure, modèle |
 
 L'observabilité et la CI/CD n'ont pas de document propre : ce sont des sections des documents