diff --git a/ROADMAP.md b/ROADMAP.md
index a1fbb46..738daae 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -159,49 +159,63 @@
 
 ## 📐 Architecture Actuelle
 
-```
-┌─────────────────────────────────────────────────────────┐
-│                     FRONTEND (SPA)                       │
-│  Vanilla JS + Tailwind CSS + Chart.js + SortableJS      │
-│  Canvas Gauges • Dark Mode • Mobile-First               │
-└─────────────────┬───────────────────────────────────────┘
-                  │ REST API (JWT)
-┌─────────────────▼───────────────────────────────────────┐
-│                   BACKEND (FastAPI)                      │
-│                                                          │
-│  ┌──────────┐ ┌──────────┐ ┌──────────┐ ┌────────────┐ │
-│  │ Auth     │ │Challenges│ │ Health   │ │ Analytics  │ │
-│  │ /api/auth│ │/api/chal-│ │ /api/    │ │ /api/      │ │
-│  │          │ │ lenges   │ │ health*  │ │ analytics  │ │
-│  └──────────┘ └──────────┘ └──────────┘ └────────────┘ │
-│  ┌──────────────────────────────────────────────────────┐│
-│  │              Health Connect API                       ││
-│  │  /api/health-connect/sync • /sync-raw • Raw Storage  ││
-│  └──────────────────────────────────────────────────────┘│
-│  ┌──────────────────────────────────────────────────────┐│
-│  │              Service Layer                            ││
-│  │  AuthService • AggregationService • HealthProvider   ││
-│  └──────────────────────────────────────────────────────┘│
-└─────────────────┬───────────────────────────────────────┘
-                  │ SQLAlchemy ORM
-┌─────────────────▼───────────────────────────────────────┐
-│              DATABASE (PostgreSQL / SQLite)              │
-│                                                          │
-│  6 Core Tables  │  3 HC Aggregated  │  15 HC Raw Tables │
-│  users          │  sync_logs        │  hc_raw_steps     │
-│  challenges     │  daily_metrics    │  hc_raw_heart_*   │
-│  tracking       │  exercise_sessions│  hc_raw_sleep_*   │
-│  daily_health_* │                   │  hc_raw_spo2...   │
-│  daily_context  │                   │  (15 total)       │
-│  workout_sess.  │                   │                   │
-└─────────────────┬───────────────────────────────────────┘
-                  │
-┌─────────────────▼───────────────────────────────────────┐
-│              ANDROID COMPANION APP                       │
-│  Health Connect API → Raw Records → POST /sync-raw      │
-│  Kotlin • Retrofit • Jetpack • Health Connect SDK       │
-│  Auto-sync • Sync History • Connection Test             │
-└─────────────────────────────────────────────────────────┘
+```mermaid
+graph TB
+    subgraph FRONTEND["🖥️ FRONTEND (SPA)"]
+        direction LR
+        FE_TECH["Vanilla JS · Tailwind CSS · Chart.js · SortableJS<br/>Canvas Gauges · Dark Mode · Mobile-First"]
+    end
+
+    subgraph BACKEND["⚙️ BACKEND (FastAPI)"]
+        direction TB
+        subgraph ROUTES["Routes API"]
+            AUTH["🔐 Auth<br/>/api/auth"]
+            CHAL["🎯 Challenges<br/>/api/challenges"]
+            HEALTH["❤️ Health<br/>/api/health*"]
+            ANALYTICS["📊 Analytics<br/>/api/analytics"]
+            HC_API["📱 Health Connect<br/>/api/health-connect/sync-raw"]
+        end
+        subgraph SERVICES["Service Layer"]
+            AUTH_SVC["AuthService"]
+            AGG_SVC["AggregationService"]
+            HP["HealthProvider"]
+        end
+        ROUTES --> SERVICES
+    end
+
+    subgraph DB["🗄️ DATABASE (PostgreSQL / SQLite)"]
+        direction LR
+        subgraph CORE["6 Core Tables"]
+            CORE_T["users · challenges · tracking<br/>daily_health_metrics<br/>daily_context · workout_sessions"]
+        end
+        subgraph HC_AGG["3 HC Aggregated"]
+            HC_T["sync_logs · daily_metrics<br/>exercise_sessions"]
+        end
+        subgraph HC_RAW["15 HC Raw Tables"]
+            RAW_T["hc_raw_steps · heart_rate · sleep_*<br/>spo2 · weight · calories · distance<br/>exercise · nutrition · hydration · hrv"]
+        end
+    end
+
+    subgraph ANDROID["📱 ANDROID COMPANION"]
+        ANDROID_TECH["Kotlin · Retrofit · Health Connect SDK<br/>Auto-sync · Sync History · Connection Test"]
+    end
+
+    FRONTEND -->|"REST API (JWT)"| BACKEND
+    BACKEND -->|"SQLAlchemy ORM"| DB
+    ANDROID -->|"POST /sync-raw"| HC_API
+    ANDROID -.->|"Health Connect API"| HC["🏥 Android Health Connect"]
+    HC -->|"Raw Records"| ANDROID
+
+    style FRONTEND fill:#1e293b,stroke:#38bdf8,color:#e2e8f0
+    style BACKEND fill:#1e293b,stroke:#10b981,color:#e2e8f0
+    style DB fill:#1e293b,stroke:#f59e0b,color:#e2e8f0
+    style ANDROID fill:#1e293b,stroke:#a78bfa,color:#e2e8f0
+    style HC fill:#1e293b,stroke:#ef4444,color:#e2e8f0
+    style ROUTES fill:#0f172a,color:#e2e8f0
+    style SERVICES fill:#0f172a,color:#e2e8f0
+    style CORE fill:#0f172a,color:#e2e8f0
+    style HC_AGG fill:#0f172a,color:#e2e8f0
+    style HC_RAW fill:#0f172a,color:#e2e8f0
 ```
 
 ---