diff --git a/dev/lobby-backend/src/controllers/sector.controller.js b/dev/lobby-backend/src/controllers/sector.controller.js
index 192f146..1406299 100644
--- a/dev/lobby-backend/src/controllers/sector.controller.js
+++ b/dev/lobby-backend/src/controllers/sector.controller.js
@@ -1,63 +1,69 @@
 import pool from '../db.js';
+import * as sectorService from '../services/sector.service.js';
 
 /**
  * Liefert alle Sektoren für das Frontend.
- * Unterteilt in "Meine Sektoren" (wo der User schon spielt)
- * und "Alle Sektoren" (die generell verfügbar sind)
+ * Übergibt die HTTP-Anfrage an den zuständigen Service und liefert das Ergebnis aus.
  */
-export const getSectorsList = async(req, res) => {
+export const getSectorsList = async (req, res) => {
     const accountId = req.user.accountId;
-    const client = await pool.connect();
 
     try {
-        // "Meine Sektoren" abfragen
-        const mySectorsResult = await client.query(`
-            SELECT
-                s.id, s.name, s.status, s.speed_fleet, s.speed_economy,
-                las.local_username,
-                las.created_at as joined_at,
-                las.updated_at as last_played
-            FROM sectors s
-            JOIN lobby_accounts_sectors las ON s.id = las.sector_id
-            WHERE las.lobby_account_id = $1
-            ORDER BY las.updated_at DESC
-        `, [accountId]);
-
-        // "Neue Sektoren"
-        const newSectorsResult = await client.query(`
-            SELECT
-                id, name, status, speed_fleet, speed_economy
-            FROM sectors
-            WHERE status != 'offline'
-            AND id NOT IN (
-                SELECT sector_id
-                FROM lobby_accounts_sectors
-                WHERE lobby_account_id = $1
-            )
-            ORDER BY created_at ASC
-        `, [accountId]);
-
-
-            // Daten platzhalter
-            const mapSectorData = (sector) => ({
-                ...sector,
-                online_players: Math.floor(Math.random() * 150) + 10,
-                planets_count: (Math.floor(Math.random() * 150) + 10) * 12
-            });
-
+        const sectorData = await sectorService.getSectorsList(accountId);
 
         return res.status(200).json({
             success: true,
-            mySectors: mySectorsResult.rows.map(mapSectorData),
-            newSectors: newSectorsResult.rows.map(mapSectorData)
+            ...sectorData
         });
 
     } catch (error) {
-        console.error('[SectorController] Fehler beim Abrufen der Sektoren:', error);
+        console.error('[SectorController] Fehler in getSectorsList:', error);
+
+        return res.status(500).json({
+            error: 'ERR_INTERNAL_SERVER'
+        });
+    }
+};
+
+/**
+ * Controller-Methode für den Sektor-Beitritt (Charaktererstellung).
+ * Nimmt die Request an, validiert grob und leitet an den Service weiter.
+ */
+export const joinSector = async (req, res) => {
+    const accountId = req.user.accountId;
+    const { sectorId, localUsername, gender } = req.body;
+
+    if (!sectorId || !localUsername || !gender) {
+        return res.status(400).json({
+            error: 'ERR_MISSING_FIELDS'
+        });
+    }
+
+    if (localUsername.length < 3) {
+        return res.status(400).json({
+            error: 'ERR_USERNAME_TOO_SHORT'
+        });
+    }
+
+    try {
+        await sectorService.joinSector(accountId, sectorId, localUsername, gender);
+
+        return res.status(201).json({
+            success: true,
+            message: 'MSG_SECTOR_JOINED_SUCCESS'
+        });
+
+    } catch (error) {
+        if (error.code === 'ERR_ALREADY_IN_SECTOR' || error.code === 'ERR_LOCAL_USERNAME_TAKEN') {
+            return res.status(409).json({
+                error: error.code
+            });
+        }
+
+        // Generischer Fallback für echte Systemabstürze
+        console.error('[SectorController] Fehler beim Sektor-Beitritt:', error);
         return res.status(500).json({
             error: 'ERR_INTERNAL_SERVER'
         });
-    } finally {
-        client.release();
     }
 };
\ No newline at end of file
diff --git a/dev/lobby-backend/src/routes/sector.routes.js b/dev/lobby-backend/src/routes/sector.routes.js
index 193a053..690770f 100644
--- a/dev/lobby-backend/src/routes/sector.routes.js
+++ b/dev/lobby-backend/src/routes/sector.routes.js
@@ -5,5 +5,6 @@ import { requireAuth } from '../middlewares/auth.middleware.js';
 const router = express.Router();
 
 router.get('/list', requireAuth, sectorController.getSectorsList);
+router.post('/join', requireAuth, sectorController.joinSector);
 
 export default router;
\ No newline at end of file
diff --git a/dev/lobby-backend/src/scripts/initDb.js b/dev/lobby-backend/src/scripts/initDb.js
index dff1241..e75deca 100644
--- a/dev/lobby-backend/src/scripts/initDb.js
+++ b/dev/lobby-backend/src/scripts/initDb.js
@@ -58,11 +58,13 @@ CREATE TABLE IF NOT EXISTS lobby_accounts_sectors (
     id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
     lobby_account_id UUID REFERENCES lobby_accounts(id) ON DELETE CASCADE,
     sector_id UUID REFERENCES sectors(id) ON DELETE CASCADE,
-    local_username VARCHAR(50) UNIQUE NOT NULL,
+    local_username VARCHAR(50) NOT NULL,
+    gender VARCHAR(20) NOT NULL,
     res_premium INT DEFAULT 0,
     created_at TIMESTAMPTZ DEFAULT NOW(),
     updated_at TIMESTAMPTZ DEFAULT NOW(),
-    UNIQUE(lobby_account_id, sector_id)
+    UNIQUE(lobby_account_id, sector_id),
+    UNIQUE(sector_id, local_username)
 );
 
 -- ------------------------------------------------------------------------------
diff --git a/dev/lobby-backend/src/services/sector.service.js b/dev/lobby-backend/src/services/sector.service.js
new file mode 100644
index 0000000..f792831
--- /dev/null
+++ b/dev/lobby-backend/src/services/sector.service.js
@@ -0,0 +1,107 @@
+import pool from '../db.js';
+
+/**
+ * Ruft die Sektorlisten für einen bestimmten Account ab.
+ * Unterteilt das Ergebnis in bereits beigetretene Sektoren ("Meine Sektoren")
+ * und noch verfügbare Sektoren ("Neue Sektoren").
+ * 
+ * @param {string} accountId - Die UUID des aktuell eingeloggten Spielers
+ * 
+ * @returns {Promise<Object>} - Ein Objekt mit den Arrays 'mySectors' und 'newSectors'
+ */
+export const getSectorsList = async (accountId) => {
+    const client = await pool.connect();
+
+    try {
+        const mySectorsResult = await client.query(`
+            SELECT
+                s.id, s.name, s.status, s.speed_fleet, s.speed_economy,
+                las.local_username, las.gender,
+                las.created_at as joined_at,
+                las.updated_at as last_played
+            FROM sectors s
+            JOIN lobby_accounts_sectors las ON s.id = las.sector_id
+            WHERE las.lobby_account_id = $1
+            ORDER BY las.updated_at DESC
+        `, [accountId]);
+
+        const newSectorsResult = await client.query(`
+            SELECT
+                id, name, status, speed_fleet, speed_economy
+            FROM sectors
+            WHERE status != 'offline'
+            AND id NOT IN (
+                SELECT sector_id
+                FROM lobby_accounts_sectors
+                WHERE lobby_account_id = $1
+            )
+            ORDER BY created_at ASC
+        `, [accountId]);
+
+        const mapSectorData = (sector) => ({
+            ...sector,
+            online_players: Math.floor(Math.random() * 150) + 10,
+            planets_count: (Math.floor(Math.random() * 150) + 10) * 12
+        });
+
+        return {
+            mySectors: mySectorsResult.rows.map(mapSectorData),
+            newSectors: newSectorsResult.rows.map(mapSectorData)
+        };
+
+    } catch (error) {
+        console.error('[SectorService] Fehler beim Auslesen der Sektordaten:', error);
+        throw error;
+
+    } finally {
+        client.release();
+    }
+};
+
+/**
+ * Trägt einen Spieler in einen neuen Sektor ein.
+ * Führt die eigentliche Datenbankoperation durch und wirft spezifische
+ * Fehler-Objekte, falls Constraints (UNIQUE-Regeln) verletzt werden.
+ *
+ * @param {string} accountId - Die UUID des Nutzers
+ * @param {string} sectorId - Die UUID des Sektors
+ * @param {string} localUsername - Der Commander-Name für diesen Sektor
+ * @param {string} gender - Das gewählte Geschlecht ('male' oder 'female')
+ * 
+ * @returns {boolean} - true bei Erfolg
+ */
+export const joinSector = async (accountId, sectorId, localUsername, gender) => {
+    const client = await pool.connect();
+
+    try {
+        // Wir versuchen, den Datensatz direkt einzufügen.
+        await client.query(`
+            INSERT INTO lobby_accounts_sectors (lobby_account_id, sector_id, local_username, gender)
+            VALUES ($1, $2, $3, $4)
+        `, [accountId, sectorId, localUsername, gender]);
+
+        return true;
+
+    } catch (error) {
+        // Fehlercode 23505 = Postgres "unique_violation"
+        if (error.code === '23505') {
+            
+            if (error.constraint === 'lobby_accounts_sectors_lobby_account_id_sector_id_key') {
+                const customErr = new Error('Already in sector');
+                customErr.code = 'ERR_ALREADY_IN_SECTOR';
+                throw customErr;
+            }
+            
+            if (error.constraint === 'lobby_accounts_sectors_sector_id_local_username_key') {
+                const customErr = new Error('Local username taken');
+                customErr.code = 'ERR_LOCAL_USERNAME_TAKEN';
+                throw customErr;
+            }
+        }
+
+        throw error;
+
+    } finally {
+        client.release();
+    }
+};
\ No newline at end of file
diff --git a/dev/lobby-frontend/index.html b/dev/lobby-frontend/index.html
index a4fce10..92a54b1 100644
--- a/dev/lobby-frontend/index.html
+++ b/dev/lobby-frontend/index.html
@@ -55,20 +55,35 @@
         <a href="#" id="forgot-password-link" data-i18n="link_forgot_password" style="display: none;">Passwort vergessen?</a>
         <a href="#" id="back-link" data-i18n="link_back" style="display: none;">« Zurück</a>
 
-        <a href="https://discord.gg/ppjXBE4DbP" target="_blank" id="discord-link"></a>
+        <a href="https://discord.gg/agQhwDdVfK" target="_blank" id="discord-link"></a>
 
       </form>
     </div>
 
     <div id="sector-browser-layer" style="display: none;">
-      
       <div id="sector-tab-container">
+        <button type="button" class="tab-btn active" id="tab-last-sector">Zuletzt gespielt</button>
         <button type="button" class="tab-btn active" id="tab-my-sectors">Meine Sektoren</button>
         <button type="button" class="tab-btn" id="tab-new-sectors">Neue Sektoren</button>
       </div>
-
       <div id="sector-list-container"></div>
+    </div>
 
+    <div id="sector-onboarding-layer" style="display: none;">
+      
+      <form id="onboarding-form" autocomplete="off">
+        
+        <input type="text" id="local-username" placeholder="Benutzername eingeben" required>
+
+        <button type="button" id="btn-gender-male" class="gender-btn active" data-gender="male" data-i18n="btn_male">Männlich</button>
+        <button type="button" id="btn-gender-female" class="gender-btn" data-gender="female" data-i18n="btn_female">Weiblich</button>
+
+        <div id="onboarding-msg-box"></div>
+
+        <button type="button" id="btn-cancel-onboarding" data-i18n="btn_cancel">Abbrechen</button>
+        <button type="submit" id="btn-submit-onboarding" data-i18n="btn_join">Beitreten</button>
+
+      </form>
     </div>
 
     <div id="lobby-ui">
diff --git a/dev/lobby-frontend/src/api/sectors.js b/dev/lobby-frontend/src/api/sectors.js
index 81c552d..0cfa6b9 100644
--- a/dev/lobby-frontend/src/api/sectors.js
+++ b/dev/lobby-frontend/src/api/sectors.js
@@ -30,3 +30,33 @@ export async function fetchSectorsList(token) {
         throw error;
     }
 }
+
+/**
+ * Sendet die Anfrage an das Backend, um einem neuen Sektor beizutreten.
+ * 
+ * @param {string} token - Das JWT Access Token
+ * @param {string} sectorId - Die UUID des Sektors
+ * @param {string} localUsername - Der gewünschte Commander-Name
+ * @param {string} gender - Das gewählte Geschlecht ('male' oder 'female')
+ * 
+ * @returns {Promise<Object>} - Ein Objekt mit 'ok' (boolean) und den 'data' (JSON)
+ */
+export async function joinSectorUser(token, sectorId, localUsername, gender) {
+    try {
+        const response = await fetch(`${API_BASE_URL}/join`, {
+            method: 'POST',
+            headers: { 
+                'Authorization': `Bearer ${token}`,
+                'Content-Type': 'application/json' 
+            },
+            body: JSON.stringify({ sectorId, localUsername, gender })
+        });
+        
+        const data = await response.json();
+        return { ok: response.ok, data };
+
+    } catch (error) {
+        console.error("Netzwerkfehler beim Sektor-Beitritt:", error);
+        throw error;
+    }
+}
\ No newline at end of file
diff --git a/dev/lobby-frontend/src/assets/ui-atlas.json b/dev/lobby-frontend/src/assets/ui-atlas.json
index 0743330..cc7554d 100644
--- a/dev/lobby-frontend/src/assets/ui-atlas.json
+++ b/dev/lobby-frontend/src/assets/ui-atlas.json
@@ -192,7 +192,7 @@
         "y": 0.5
       }
     },
-    "SPR_SciFiMenus_Menu_Item_Selected_20": {
+    "SPR_SciFiMenus_Menu_Item_Background_05": {
       "frame": {
         "x": 3737,
         "y": 262,
@@ -216,10 +216,34 @@
         "y": 0.5
       }
     },
-    "SPR_SciFiMenus_Menu_Item_Selected_10": {
+    "SPR_SciFiMenus_Menu_Item_Selected_20": {
       "frame": {
         "x": 3737,
         "y": 522,
+        "w": 256,
+        "h": 256
+      },
+      "rotated": false,
+      "trimmed": false,
+      "spriteSourceSize": {
+        "x": 0,
+        "y": 0,
+        "w": 256,
+        "h": 256
+      },
+      "sourceSize": {
+        "w": 256,
+        "h": 256
+      },
+      "pivot": {
+        "x": 0.5,
+        "y": 0.5
+      }
+    },
+    "SPR_SciFiMenus_Menu_Item_Selected_10": {
+      "frame": {
+        "x": 3737,
+        "y": 782,
         "w": 228,
         "h": 234
       },
@@ -243,7 +267,7 @@
     "ICON_SciFiMenus_Menu_Solo_01_Clean": {
       "frame": {
         "x": 3969,
-        "y": 522,
+        "y": 782,
         "w": 125,
         "h": 194
       },
@@ -264,30 +288,6 @@
         "y": 0.5
       }
     },
-    "SPR_SciFiMenus_Menu_Item_Selected_19": {
-      "frame": {
-        "x": 3737,
-        "y": 760,
-        "w": 228,
-        "h": 234
-      },
-      "rotated": false,
-      "trimmed": true,
-      "spriteSourceSize": {
-        "x": 14,
-        "y": 10,
-        "w": 228,
-        "h": 234
-      },
-      "sourceSize": {
-        "w": 256,
-        "h": 256
-      },
-      "pivot": {
-        "x": 0.5,
-        "y": 0.5
-      }
-    },
     "SPR_SciFiMenus_Background_Hexagons_01": {
       "frame": {
         "x": 2834,
@@ -312,20 +312,20 @@
         "y": 0.5
       }
     },
-    "ICON_Social_Discord": {
+    "SPR_SciFiMenus_Menu_Item_Selected_19": {
       "frame": {
         "x": 3350,
         "y": 859,
-        "w": 226,
-        "h": 175
+        "w": 228,
+        "h": 234
       },
       "rotated": false,
       "trimmed": true,
       "spriteSourceSize": {
         "x": 14,
-        "y": 41,
-        "w": 226,
-        "h": 175
+        "y": 10,
+        "w": 228,
+        "h": 234
       },
       "sourceSize": {
         "w": 256,
@@ -338,7 +338,7 @@
     },
     "ICON_SciFiMenus_Menu_Lock_Closed_01_Clean": {
       "frame": {
-        "x": 3580,
+        "x": 3582,
         "y": 859,
         "w": 132,
         "h": 164
@@ -360,20 +360,20 @@
         "y": 0.5
       }
     },
-    "SPR_SciFiMenus_Menu_Item_Background_07": {
+    "ICON_Social_Discord": {
       "frame": {
-        "x": 3716,
-        "y": 998,
-        "w": 224,
-        "h": 230
+        "x": 3718,
+        "y": 1020,
+        "w": 226,
+        "h": 175
       },
       "rotated": false,
       "trimmed": true,
       "spriteSourceSize": {
-        "x": 16,
-        "y": 12,
-        "w": 224,
-        "h": 230
+        "x": 14,
+        "y": 41,
+        "w": 226,
+        "h": 175
       },
       "sourceSize": {
         "w": 256,
@@ -386,7 +386,7 @@
     },
     "ICON_SciFi_Map_Message": {
       "frame": {
-        "x": 3580,
+        "x": 3582,
         "y": 1027,
         "w": 130,
         "h": 88
@@ -408,10 +408,34 @@
         "y": 0.5
       }
     },
-    "ICON_SciFiMenus_Menu_Warning_02_Clean": {
+    "SPR_SciFiMenus_Menu_Item_Background_07": {
       "frame": {
         "x": 3350,
-        "y": 1038,
+        "y": 1097,
+        "w": 224,
+        "h": 230
+      },
+      "rotated": false,
+      "trimmed": true,
+      "spriteSourceSize": {
+        "x": 16,
+        "y": 12,
+        "w": 224,
+        "h": 230
+      },
+      "sourceSize": {
+        "w": 256,
+        "h": 256
+      },
+      "pivot": {
+        "x": 0.5,
+        "y": 0.5
+      }
+    },
+    "ICON_SciFiMenus_Menu_Warning_02_Clean": {
+      "frame": {
+        "x": 3578,
+        "y": 1199,
         "w": 222,
         "h": 193
       },
@@ -434,8 +458,8 @@
     },
     "ICON_SciFiMenus_Menu_Multiplayer_01_Clean": {
       "frame": {
-        "x": 3576,
-        "y": 1232,
+        "x": 3350,
+        "y": 1331,
         "w": 218,
         "h": 141
       },
@@ -458,8 +482,8 @@
     },
     "ICON_SciFiMenus_Menu_Planet_02_Clean": {
       "frame": {
-        "x": 3350,
-        "y": 1235,
+        "x": 3804,
+        "y": 1199,
         "w": 216,
         "h": 149
       },
@@ -482,8 +506,8 @@
     },
     "ICON_SciFiMenus_Menu_Tick_01_Clean": {
       "frame": {
-        "x": 3798,
-        "y": 1232,
+        "x": 3804,
+        "y": 1352,
         "w": 191,
         "h": 144
       },
@@ -506,8 +530,8 @@
     },
     "ICON_SciFiMenus_Menu_Settings_01_Clean": {
       "frame": {
-        "x": 3570,
-        "y": 1377,
+        "x": 3572,
+        "y": 1396,
         "w": 182,
         "h": 199
       },
@@ -530,8 +554,8 @@
     },
     "ICON_SciFiMenus_Menu_Message_01_Clean": {
       "frame": {
-        "x": 3570,
-        "y": 1580,
+        "x": 3758,
+        "y": 1500,
         "w": 177,
         "h": 218
       },
@@ -560,7 +584,7 @@
     "format": "RGBA8888",
     "size": {
       "w": 4096,
-      "h": 1800
+      "h": 1720
     },
     "scale": 1
   }
diff --git a/dev/lobby-frontend/src/assets/ui-atlas.png b/dev/lobby-frontend/src/assets/ui-atlas.png
index ecf810e..e6cb62d 100644
Binary files a/dev/lobby-frontend/src/assets/ui-atlas.png and b/dev/lobby-frontend/src/assets/ui-atlas.png differ
diff --git a/dev/lobby-frontend/src/core/pixi-app.js b/dev/lobby-frontend/src/core/pixi-app.js
index 92a4e68..8217048 100644
--- a/dev/lobby-frontend/src/core/pixi-app.js
+++ b/dev/lobby-frontend/src/core/pixi-app.js
@@ -30,7 +30,7 @@ export function setupResize(refs) {
     const {
         background, discordContainer, logoContainer, uiContainer,
         panelFrame, lobbyPixiContainer, footerBackground, footerPattern,
-        footerBackgroundContainer
+        footerBackgroundContainer, onboardingPixiContainer
     } = refs;
     
     function resize() {
@@ -133,12 +133,15 @@ export function setupResize(refs) {
             sectorListContainer.style.height = `${targetMaskHeight}px`; 
         }
 
+        if (onboardingPixiContainer) {
+            onboardingPixiContainer.x = (screenWidth - 450) / 2;
+            onboardingPixiContainer.y = (screenHeight - 550) / 2;
+        }
+
         footerBackground.height = actualFooterHeight;
         footerPattern.height = actualFooterHeight;
-
         footerBackground.width = screenWidth;
         footerPattern.width = screenWidth;
-        
         footerBackgroundContainer.y = screenHeight - footerHeight;
     }
     
diff --git a/dev/lobby-frontend/src/css/lobby.css b/dev/lobby-frontend/src/css/lobby.css
index b350542..8c929e7 100644
--- a/dev/lobby-frontend/src/css/lobby.css
+++ b/dev/lobby-frontend/src/css/lobby.css
@@ -162,8 +162,8 @@
     top: 50%;
     transform: translate(-50%, -50%); 
     pointer-events: auto; 
+    transition: opacity 0.3s ease; 
 }
-
 #sector-tab-container {
     position: absolute;
     top: 20px;
@@ -190,15 +190,19 @@
     height: 540px;
     overflow-y: auto;
     overflow-x: hidden;
-    padding: 20px 40px; 
+    padding: 20px 40px; /* Zurück zu den perfekten 40px */
     box-sizing: border-box;
+    
+    /* Zurück zum Grid für eine saubere Matrix-Optik */
     display: grid;
     grid-template-columns: repeat(4, 270px); 
     grid-auto-rows: 90px;
     row-gap: 20px;
     column-gap: 25px;
     align-content: start;
-    justify-content: flex-start;
+    
+    /* Zentriert den gesamten Grid-Block (inkl. Lücken) mittig im Container */
+    justify-content: center; 
 }
 
 .sector-card-link {
diff --git a/dev/lobby-frontend/src/css/onboarding.css b/dev/lobby-frontend/src/css/onboarding.css
new file mode 100644
index 0000000..6b56c08
--- /dev/null
+++ b/dev/lobby-frontend/src/css/onboarding.css
@@ -0,0 +1,108 @@
+/* Haupt-Ebene abdunklung entfernen, das macht jetzt PixiJS */
+#sector-onboarding-layer {
+    position: absolute;
+    width: 100%;
+    height: 100%;
+    left: 0;
+    top: 0;
+    z-index: 50; 
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    pointer-events: none; 
+}
+
+#onboarding-form {
+    position: relative;
+    width: 450px;
+    height: 550px;
+    background: transparent;
+    pointer-events: auto;
+}
+
+#local-username {
+    position: absolute;
+    left: 75px;
+    top: 250px;
+    width: 300px;
+    height: 50px;
+    background: transparent;
+    border: none;
+    color: var(--color-text-main);
+    padding: 0 15px;
+    font-size: 16px;
+    font-family: inherit;
+    outline: none;
+    box-sizing: border-box;
+}
+
+#local-username::placeholder {
+     color: var(--color-text-placeholder); 
+}
+#local-username:focus { 
+    text-shadow: 0 0 8px var(--color-cyan-dark); 
+}
+
+#btn-gender-male { 
+    position: absolute; 
+    left: 75px; 
+    top: 320px; 
+    width: 140px; 
+    height: 50px; 
+}
+
+#btn-gender-female { 
+    position: absolute; 
+    left: 235px; 
+    top: 320px; 
+    width: 140px; 
+    height: 50px; 
+}
+
+#btn-cancel-onboarding { 
+    position: absolute; 
+    left: 75px; 
+    top: 460px; 
+    width: 140px; 
+    height: 50px; 
+}
+
+#btn-submit-onboarding { 
+    position: absolute; 
+    left: 235px; 
+    top: 460px; 
+    width: 140px; 
+    height: 50px; 
+}
+
+#onboarding-form button {
+    background: transparent;
+    border: none;
+    color: var(--color-text-inactive);
+    font-size: 14px;
+    font-family: inherit;
+    text-transform: uppercase;
+    cursor: pointer;
+    outline: none;
+    transition: color 0.2s ease, text-shadow 0.2s ease;
+}
+
+#onboarding-form button:hover,
+#onboarding-form button.active {
+    color: var(--color-text-main);
+    text-shadow: 0 0 8px var(--color-cyan-bright);
+}
+
+#onboarding-msg-box {
+    position: absolute;
+    top: 400px; /* Zwischen Geschlecht und Buttons */
+    width: 100%;
+    text-align: center;
+    color: var(--color-error);
+    font-size: 14px;
+    font-weight: bold;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    height: 30px;
+}
\ No newline at end of file
diff --git a/dev/lobby-frontend/src/i18n.js b/dev/lobby-frontend/src/i18n.js
index 76f23b7..5032d5a 100644
--- a/dev/lobby-frontend/src/i18n.js
+++ b/dev/lobby-frontend/src/i18n.js
@@ -15,6 +15,10 @@ export const translations = {
         btn_reset_password: "Passwort ändern",
         discord_text: "Offizieller Discord Server",
         link_back: "« Zurück",
+        btn_male: "Männlich",
+        btn_female: "Weiblich",
+        btn_cancel: "Abbrechen",
+        btn_join: "Beitreten",
         
         // --- Platzhalter (Placeholders) ---
         ph_username_login: "Benutzername / E-Mail",
@@ -35,6 +39,11 @@ export const translations = {
         msg_verify_success: "Verifizierung erfolgreich! Du kannst dich nun einloggen.",
         link_resend_otp: "Code erneut senden",
 
+        // --- Sektor-Onboarding ---
+        ERR_ALREADY_IN_SECTOR: "Du bist diesem Sektor bereits beigetreten.",
+        ERR_LOCAL_USERNAME_TAKEN: "Dieser Commander-Name ist in diesem Sektor leider schon vergeben.",
+        MSG_SECTOR_JOINED_SUCCESS: "Sektor erfolgreich beigetreten!",        
+
         // --- Footer ---
         link_imprint: "Impressum",
         link_privacy: "Datenschutz",
@@ -71,6 +80,10 @@ export const translations = {
         btn_reset_request: "REQUEST CODE",
         btn_reset_password: "CHANGE PASSWORD",
         link_back: "« back",
+        btn_male: "Male",
+        btn_female: "Femail",
+        btn_cancel: "Cancel",
+        btn_join: "Join Sector",
         
         // --- Placeholders ---
         ph_username_login: "Username / E-Mail",
@@ -91,6 +104,11 @@ export const translations = {
         msg_verify_success: "Verification successful! You can now log in.",
         link_resend_otp: "Resend Code",
 
+        // --- Sektor-Onboarding ---
+        ERR_ALREADY_IN_SECTOR: "You have already joined this sector.",
+        ERR_LOCAL_USERNAME_TAKEN: "This Commander name is already taken in this sector.",
+        MSG_SECTOR_JOINED_SUCCESS: "Successfully joined the sector!",
+
         // --- Footer ---
         link_imprint: "Imprint",
         link_privacy: "Privacy Policy",
diff --git a/dev/lobby-frontend/src/main.js b/dev/lobby-frontend/src/main.js
index 8caa9b3..8c5610d 100644
--- a/dev/lobby-frontend/src/main.js
+++ b/dev/lobby-frontend/src/main.js
@@ -3,10 +3,10 @@ import { Assets, Sprite, NineSliceSprite, Container, TilingSprite, Text, wordWra
 import { loginUser, registerUser, verifyEmailUser, resendOTPCode, requestPasswordResetUser, resetPasswordUser, refreshAccessTokenUser } from './api/auth.js';
 import { initDropdowns, updateTranslations } from './ui/dropdowns.js';
 import { initForms, formState, setOtpMode, setResetPasswordMode, startVisualCountdown, setRegisterMode } from './ui/forms.js';
-import { fetchSectorsList } from './api/sectors.js';
+import { fetchSectorsList, joinSectorUser } from './api/sectors.js';
 import { app, initPixi, setupResize, triggerResize } from './core/pixi-app.js';
 import { buildLoginScene, LOGIN_COLORS } from './scenes/login-scene.js';
-import { buildLobbyBase, createSectorTabPixi, createSectorCardPixi } from './scenes/lobby-scene.js';
+import { buildLobbyBase, createSectorTabPixi, createSectorCardPixi, buildOnboardingModalPixi } from './scenes/lobby-scene.js';
 
 let globalSheet = null;
 let background = null;
@@ -17,6 +17,10 @@ let sectorTabsPixiContainer = null;
 let footerBackground = null;
 let footerPattern = null;
 let footerBackgroundContainer = null;
+let onboardingPixiContainer = null;
+let onboardingPixiRefs = null;
+let selectedSectorId = null;
+let selectedOnboardingGender = 'male';
 
 async function initGame() {
     await initPixi('pixi-container');
@@ -96,6 +100,9 @@ function buildScene(bgTexture, sheet) {
 
     app.stage.addChild(footerBackgroundContainer);
 
+    onboardingPixiRefs = buildOnboardingModalPixi(app.stage, sheet);
+    onboardingPixiContainer = onboardingPixiRefs.container;
+
     const loginRefs = buildLoginScene(uiContainer, sheet);
 
     initForms({
@@ -123,7 +130,8 @@ function buildScene(bgTexture, sheet) {
         lobbyPixiContainer, 
         footerBackground, 
         footerPattern, 
-        footerBackgroundContainer 
+        footerBackgroundContainer,
+        onboardingPixiContainer 
     });
 
     formState.isLoginMode = true;
@@ -263,7 +271,7 @@ form.addEventListener('submit', async (e) => {
 
             setTimeout(() => {
                 setOtpMode(emailVal);
-            }, 3000);
+            }, 1500);
 
         } catch (error) {
             msgBox.style.color = 'var(--color-error)';
@@ -378,6 +386,7 @@ async function loadAndRenderSectorBrowser() {
         const layer = document.getElementById('sector-browser-layer');
         layer.style.display = 'block';
 
+        const tabLastSector = document.getElementById('tab-last-sector');
         const tabMySectors = document.getElementById('tab-my-sectors');
         const tabNewSectors = document.getElementById('tab-new-sectors');
 
@@ -392,43 +401,111 @@ async function loadAndRenderSectorBrowser() {
         const centerPos = isMobilePortrait ? 325 : 620;
 
         if (data.mySectors.length === 0) {
+            // Szenario A: Keine eigenen Sektoren
+            tabLastSector.style.display = 'none';
             tabMySectors.style.display = 'none';
             tabNewSectors.classList.add('active');
-            
+
             const singleTabX = centerPos - 90;
-            const tabNewBg = createSectorTabPixi(globalSheet, singleTabX, 20, 0x00f0ff, 0.6);
-            sectorTabsPixiContainer.addChild(tabNewBg);
+            const tabNewBg = createSectorTabPixi(globalSheet, singleTabX, 20, LOGIN_COLORS.TAB_ACTIVE, 0.6);
+            // ACHTUNG: Hier jetzt .container verwenden!
+            sectorTabsPixiContainer.addChild(tabNewBg.container); 
             renderSectorList(data.newSectors, 'new');
+
         } else {
+            // Szenario B: Eigene Sektoren vorhanden
+            tabLastSector.style.display = 'inline-block';
             tabMySectors.style.display = 'inline-block';
             tabNewSectors.style.display = 'inline-block';
-            tabMySectors.classList.add('active');
-            tabNewSectors.classList.remove('active');
 
-            const leftTabX = centerPos - 190;
-            const rightTabX = centerPos + 10;
+            // --- NEU: Daten für die Tabs filtern und aufteilen ---
+            
+            // 1. "Zuletzt gespielt"
+            // Da das Backend bereits nach Datum absteigend sortiert, ist das Element 
+            // an Index 0 garantiert der Sektor, in dem der Spieler zuletzt aktiv war.
+            // Wir packen ihn in ein neues Array, da unsere renderSectorList-Funktion ein Array erwartet.
+            const lastPlayedSectorArray = [data.mySectors[0]];
+            
+            // 2. "Meine Sektoren" (Der Rest)
+            // Wir nutzen die JavaScript-Funktion 'slice(1)', um alle Sektoren ab dem zweiten Element (Index 1) 
+            // bis zum Ende des Arrays zu kopieren. 
+            // Hinweis: Wenn der Spieler insgesamt nur 1 Sektor besitzt, gibt slice(1) automatisch 
+            // ein leeres Array [] zurück, was perfekt ist!
+            const otherMySectorsArray = data.mySectors.slice(1);
 
-            const tabMyBg = createSectorTabPixi(globalSheet, leftTabX, 20, 0x00f0ff, 0.6);
-            const tabNewBg = createSectorTabPixi(globalSheet, rightTabX, 20, 0xaaaaaa, 0.4);
-            sectorTabsPixiContainer.addChild(tabMyBg, tabNewBg);
+            // --- PixiJS-Hintergründe berechnen (unverändert) ---
+            const leftTabX = centerPos - 290;
+            const midTabX = centerPos - 90;
+            const rightTabX = centerPos + 110;
 
-            renderSectorList(data.mySectors, 'my');
+            const tabLastBg = createSectorTabPixi(globalSheet, leftTabX, 20, LOGIN_COLORS.TAB_ACTIVE, 0.6);
+            const tabMyBg = createSectorTabPixi(globalSheet, midTabX, 20, LOGIN_COLORS.TAB_INACTIVE, 0.4);
+            const tabNewBg = createSectorTabPixi(globalSheet, rightTabX, 20, LOGIN_COLORS.TAB_INACTIVE, 0.4);
+            
+            sectorTabsPixiContainer.addChild(tabLastBg.container, tabMyBg.container, tabNewBg.container);
+
+            const updateTabVisuals = (activeHtmlId) => {
+                tabLastSector.classList.remove('active');
+                tabMySectors.classList.remove('active');
+                tabNewSectors.classList.remove('active');
+                
+                document.getElementById(activeHtmlId).classList.add('active');
+
+                tabLastBg.fill.tint = LOGIN_COLORS.TAB_INACTIVE; tabLastBg.fill.alpha = 0.4;
+                tabMyBg.fill.tint = LOGIN_COLORS.TAB_INACTIVE; tabMyBg.fill.alpha = 0.4;
+                tabNewBg.fill.tint = LOGIN_COLORS.TAB_INACTIVE; tabNewBg.fill.alpha = 0.4;
+
+                if (activeHtmlId === 'tab-last-sector') { tabLastBg.fill.tint = LOGIN_COLORS.TAB_ACTIVE; tabLastBg.fill.alpha = 0.6; }
+                if (activeHtmlId === 'tab-my-sectors') { tabMyBg.fill.tint = LOGIN_COLORS.TAB_ACTIVE; tabMyBg.fill.alpha = 0.6; }
+                if (activeHtmlId === 'tab-new-sectors') { tabNewBg.fill.tint = LOGIN_COLORS.TAB_ACTIVE; tabNewBg.fill.alpha = 0.6; }
+            };
+
+            // --- ÄNDERUNG: Klick-Events mit den gefilterten Arrays versorgen ---
+            tabLastSector.onclick = () => {
+                updateTabVisuals('tab-last-sector');
+                // Wir übergeben hier ausschließlich das Array mit dem EINEN, letzten Sektor
+                renderSectorList(lastPlayedSectorArray, 'my'); 
+            };
+
+            tabMySectors.onclick = () => {
+                updateTabVisuals('tab-my-sectors');
+                // Wir übergeben hier alle Sektoren AUSSER dem letzten
+                renderSectorList(otherMySectorsArray, 'my'); 
+            };
+
+            tabNewSectors.onclick = () => {
+                updateTabVisuals('tab-new-sectors');
+                // Neue Sektoren bleiben natürlich unangetastet
+                renderSectorList(data.newSectors, 'new');
+            };
+
+            const setupTabHover = (htmlEl, pixiRef) => {
+                htmlEl.onmouseenter = () => {
+                    if (!htmlEl.classList.contains('active')) {
+                        pixiRef.fill.tint = LOGIN_COLORS.TAB_HOVER;
+                        pixiRef.fill.alpha = 0.8;
+                    }
+                };
+                htmlEl.onmouseleave = () => {
+                    if (!htmlEl.classList.contains('active')) {
+                        pixiRef.fill.tint = LOGIN_COLORS.TAB_INACTIVE;
+                        pixiRef.fill.alpha = 0.4;
+                    }
+                };
+            };
+
+            setupTabHover(tabLastSector, tabLastBg);
+            setupTabHover(tabMySectors, tabMyBg);
+            setupTabHover(tabNewSectors, tabNewBg);
+
+            // --- ÄNDERUNG: Initialer Aufruf ---
+            // Wenn die Lobby lädt, starten wir standardmäßig im "Zuletzt gespielt"-Tab,
+            // also übergeben wir auch hier das gefilterte 1-Element-Array.
+            renderSectorList(lastPlayedSectorArray, 'my');
         }
 
-        tabMySectors.onclick = () => {
-            tabMySectors.classList.add('active');
-            tabNewSectors.classList.remove('active');
-            renderSectorList(data.mySectors, 'my');
-        };
-
-        tabNewSectors.onclick = () => {
-            tabNewSectors.classList.add('active');
-            tabMySectors.classList.remove('active');
-            renderSectorList(data.newSectors, 'new');
-        };
-
     } catch (error) {
-        console.error("Netfwerkfehler beim Sektor-Abruf:", error);
+        console.error("Netzwerkfehler beim Sektor-Abruf:", error);
     }
 }
 
@@ -463,7 +540,7 @@ function renderSectorList(sectors, type) {
 
         let bottomRowHtml = '';
         if (type === 'my' && sector.local_username) {
-            bottomRowHtml = `<div style="position: absolute; left: 20px; bottom: 8px; font-size: 12px; color: var(--color-cyan-bright); font-style: italic;">Commander: ${sector.local_username}</div>`;
+            bottomRowHtml = `<div style="position: absolute; left: 100px; bottom: 40px; font-size: 12px; color: var(--color-cyan-bright); ">Spieler: ${sector.local_username}</div>`;
         }
 
         cardLink.innerHTML = `
@@ -484,19 +561,62 @@ function renderSectorList(sectors, type) {
 
         cardLink.onclick = (e) => {
             e.preventDefault();
-            console.log(`Betrete Sektor: ${sector.name} (ID: ${sector.id})`);
+            console.log(`Starte Onboarding für Sektor: ${sector.name} (ID: ${sector.id})`);
+
+            selectedSectorId = sector.id;
+
+            const sectorBrowserLayer = document.getElementById('sector-browser-layer');
+            if (sectorBrowserLayer) {
+                sectorBrowserLayer.style.opacity = 0.05;
+                sectorBrowserLayer.style.pointerEvents = 'none';
+            }
+
+            const onboardingHtmlLayer = document.getElementById('sector-onboarding-layer');
+            if (onboardingHtmlLayer) onboardingHtmlLayer.style.display = 'flex';
+            
+            if (onboardingPixiContainer) onboardingPixiContainer.visible = true;
+
+            const localUsernameInput = document.getElementById('local-username');
+            if (localUsernameInput) {
+                // Den Nutzer-String aus dem SessionStorage abrufen, den wir beim Login gespeichert haben
+                const userDataStr = sessionStorage.getItem('void_user') || localStorage.getItem('void_user');
+                if (userDataStr) {
+                    try {
+                        // Den JSON-String wieder in ein nutzbares JavaScript-Objekt umwandeln
+                        const userData = JSON.parse(userDataStr);
+                        if (userData.username) {
+                            // Wir tragen den Namen als echten Wert ein, damit das 'required' Attribut erfüllt ist
+                            localUsernameInput.value = userData.username;
+                        }
+                    } catch (err) {
+                        console.error("Fehler beim Auslesen der User-Daten für das Onboarding:", err);
+                    }
+                }
+            }
         };
         
         listContainer.appendChild(cardLink);
 
         const isMobilePortrait = window.innerWidth <= 800 && window.innerHeight > window.innerWidth;
+        // Im Hochformat haben wir 2 Spalten (durch unsere Media Query), sonst 4
         const columns = isMobilePortrait ? 2 : 4;
         const cardWidth = 270;
         const cardHeight = 90;
         const gapX = 25; 
         const gapY = 20; 
-        const startX = isMobilePortrait ? 42 : 40; 
-        const startY = 80 + 20; 
+
+        // Wir lesen die echte Breite des HTML-Containers ab (das zieht die Scrollbar automatisch ab!)
+        const listContainerDOM = document.getElementById('sector-list-container');
+        const containerClientWidth = listContainerDOM ? listContainerDOM.clientWidth : (isMobilePortrait ? 650 : 1240);
+
+        // Wir berechnen die Breite des GESAMTEN Grid-Blocks.
+        // Bei 4 Spalten: (4 * 270) + (3 * 25) = 1155px Gesamtbreite.
+        const gridBlockWidth = (columns * cardWidth) + ((columns - 1) * gapX);
+
+        // Der Start-Punkt X ist exakt die verbleibende Restbreite geteilt durch 2.
+        // Das entspricht mathematisch 1:1 dem 'justify-content: center' aus dem CSS.
+        const startX = (containerClientWidth - gridBlockWidth) / 2;
+        const startY = 100; // 80px Top-Bar-Offset + 20px Padding oben
 
         const col = index % columns;
         const row = Math.floor(index / columns);
@@ -504,7 +624,7 @@ function renderSectorList(sectors, type) {
         const posX = startX + col * (cardWidth + gapX);
         const posY = startY + row * (cardHeight + gapY);
 
-        // PixiJS-Hintergründe & Icons über unsere ausgelagerte Szene generieren lassen
+        // PixiJS-Hintergründe & Icons generieren lassen
         const cardRefs = createSectorCardPixi(globalSheet, sectorPixiContainer, posX, posY);
 
         cardLink.addEventListener('mouseenter', () => {
@@ -562,4 +682,153 @@ initDropdowns(() => {
     if (passField) passField.placeholder = formState.isOtpMode || formState.isResetPasswordMode ? t('ph_otp') : t('ph_password');
 });
 
+const btnGenderMale = document.getElementById('btn-gender-male');
+const btnGenderFemale = document.getElementById('btn-gender-female');
+const btnSubmitOnboarding = document.getElementById('btn-submit-onboarding');
+const onboardingForm = document.getElementById('onboarding-form');
+const btnCancelOnboarding = document.getElementById('btn-cancel-onboarding');
+
+if (btnCancelOnboarding) {
+    btnCancelOnboarding.addEventListener('click', (e) => {
+        e.preventDefault();
+        
+        // 1. Sektor-Browser HTML wieder voll sichtbar machen
+        const sectorBrowserLayer = document.getElementById('sector-browser-layer');
+        if (sectorBrowserLayer) {
+            sectorBrowserLayer.style.opacity = '1.0';
+            sectorBrowserLayer.style.pointerEvents = 'auto'; // Klicks wieder erlauben
+        }
+
+        // 2. HTML-Layer des Modals ausblenden
+        const onboardingHtmlLayer = document.getElementById('sector-onboarding-layer');
+        if (onboardingHtmlLayer) onboardingHtmlLayer.style.display = 'none';
+        
+        // 3. PixiJS-Layer ausblenden
+        if (onboardingPixiContainer) onboardingPixiContainer.visible = false;
+        
+        // 4. Formular zurücksetzen (damit alte Eingaben verschwinden)
+        const onboardingForm = document.getElementById('onboarding-form');
+        if (onboardingForm) onboardingForm.reset();
+        
+        // Optional: Hier auch noch die visuelle 'active' Klasse von deinen 
+        // Geschlechter-Buttons entfernen, falls nötig.
+    });
+}
+
+// --- Hilfsfunktion: Hover-Effekte synchronisieren ---
+// Genau wie beim Login übertragen wir den Mauszeiger vom unsichtbaren HTML auf PixiJS
+function syncHover(htmlElement, pixiRef, defaultTint, hoverTint = LOGIN_COLORS.TAB_HOVER) {
+    if (!htmlElement || !pixiRef) return;
+    
+    htmlElement.addEventListener('mouseenter', () => {
+        // Wenn der Button gerade "aktiv" ist (z.B. gewähltes Geschlecht), ignorieren wir den Hover
+        if (!htmlElement.classList.contains('active')) {
+            pixiRef.fill.tint = hoverTint;
+            pixiRef.fill.alpha = 0.8;
+        }
+    });
+
+    htmlElement.addEventListener('mouseleave', () => {
+        if (!htmlElement.classList.contains('active')) {
+            pixiRef.fill.tint = defaultTint;
+            pixiRef.fill.alpha = 0.6; // Zurück zur Standard-Transparenz
+        }
+    });
+}
+
+// Hover-Effekte auf die Buttons anwenden (falls onboardingPixiRefs schon existiert)
+// Wir prüfen hier sicherheitshalber ab, da die Refs asynchron generiert werden
+const applyHoverEffects = setInterval(() => {
+    if (onboardingPixiRefs) {
+        clearInterval(applyHoverEffects); // Sobald geladen, Interval stoppen
+        
+        // Geschlechter-Buttons (Standard-Farbe ist Inactive, Hover ist Weiß)
+        syncHover(btnGenderMale, onboardingPixiRefs.btnMale, LOGIN_COLORS.TAB_INACTIVE);
+        syncHover(btnGenderFemale, onboardingPixiRefs.btnFemale, LOGIN_COLORS.TAB_INACTIVE);
+        
+        // Aktions-Buttons (Standard-Farbe ist Default-Grün)
+        syncHover(btnCancelOnboarding, onboardingPixiRefs.btnCancel, LOGIN_COLORS.BTN_DEFAULT, LOGIN_COLORS.BTN_HOVER);
+        syncHover(btnSubmitOnboarding, onboardingPixiRefs.btnJoin, LOGIN_COLORS.BTN_DEFAULT, LOGIN_COLORS.BTN_HOVER);
+    }
+}, 100);
+
+// --- Geschlecht Umschalten (Toggle-Logik) ---
+if (btnGenderMale && btnGenderFemale) {
+    btnGenderMale.addEventListener('click', (e) => {
+        e.preventDefault();
+        selectedOnboardingGender = 'male';
+        
+        // HTML Klassen updaten (für Text-Farbe)
+        btnGenderMale.classList.add('active');
+        btnGenderFemale.classList.remove('active');
+        
+        // PixiJS Farben updaten
+        if (onboardingPixiRefs) {
+            onboardingPixiRefs.btnMale.fill.tint = LOGIN_COLORS.TAB_ACTIVE;
+            onboardingPixiRefs.btnMale.fill.alpha = 0.6;
+            
+            onboardingPixiRefs.btnFemale.fill.tint = LOGIN_COLORS.TAB_INACTIVE;
+            onboardingPixiRefs.btnFemale.fill.alpha = 0.4;
+        }
+    });
+
+    btnGenderFemale.addEventListener('click', (e) => {
+        e.preventDefault();
+        selectedOnboardingGender = 'female';
+        
+        // HTML Klassen updaten
+        btnGenderFemale.classList.add('active');
+        btnGenderMale.classList.remove('active');
+        
+        // PixiJS Farben updaten
+        if (onboardingPixiRefs) {
+            onboardingPixiRefs.btnFemale.fill.tint = LOGIN_COLORS.TAB_ACTIVE;
+            onboardingPixiRefs.btnFemale.fill.alpha = 0.6;
+            
+            onboardingPixiRefs.btnMale.fill.tint = LOGIN_COLORS.TAB_INACTIVE;
+            onboardingPixiRefs.btnMale.fill.alpha = 0.4;
+        }
+    });
+}
+
+// --- Formular Absenden (Beitreten) ---
+if (onboardingForm) {
+    onboardingForm.addEventListener('submit', async (e) => {
+        e.preventDefault(); // Verhindert das Neuladen der Seite
+        
+        if (!selectedSectorId) return;
+
+        const localUsername = document.getElementById('local-username').value;
+        const msgBox = document.getElementById('onboarding-msg-box');
+
+        msgBox.textContent = '...';
+        msgBox.style.color = 'var(--color-text-main)';
+
+        const token = sessionStorage.getItem('void_access_token') || localStorage.getItem('void_access_token');
+        
+        try {
+
+            const result = await joinSectorUser(token, selectedSectorId, localUsername, selectedOnboardingGender);
+
+            if (!result.ok) {
+                msgBox.style.color = 'var(--color-error)';
+                msgBox.textContent = t(result.data.error) || t('ERR_INTERNAL_SERVER');
+                return;
+            }
+
+            msgBox.style.color = 'var(--color-green-bright)';
+            msgBox.textContent = t(result.data.message);
+
+            setTimeout(() => {
+                if (btnCancelOnboarding) btnCancelOnboarding.click();
+                
+                loadAndRenderSectorBrowser();
+            }, 1500);
+
+        } catch (error) {
+            msgBox.style.color = 'var(--color-error)';
+            msgBox.textContent = t('ERR_INTERNAL_SERVER');
+        }
+    });
+}
 initGame();
\ No newline at end of file
diff --git a/dev/lobby-frontend/src/raw-assets/ui/SPR_SciFiMenus_Menu_Item_Background_05.png b/dev/lobby-frontend/src/raw-assets/ui/SPR_SciFiMenus_Menu_Item_Background_05.png
new file mode 100644
index 0000000..929a679
Binary files /dev/null and b/dev/lobby-frontend/src/raw-assets/ui/SPR_SciFiMenus_Menu_Item_Background_05.png differ
diff --git a/dev/lobby-frontend/src/scenes/lobby-scene.js b/dev/lobby-frontend/src/scenes/lobby-scene.js
index e8b877a..38c96bb 100644
--- a/dev/lobby-frontend/src/scenes/lobby-scene.js
+++ b/dev/lobby-frontend/src/scenes/lobby-scene.js
@@ -65,7 +65,7 @@ export function createSectorTabPixi(sheet, x, y, tint, alpha) {
     frame.alpha = 0.8;
     itemContainer.addChild(frame);
 
-    return itemContainer;
+    return { container: itemContainer, fill, frame };
 }
 
 /**
@@ -128,4 +128,126 @@ export function createSectorCardPixi(sheet, sectorPixiContainer, posX, posY) {
     sectorPixiContainer.addChild(iconPlanets);
 
     return { bgSprite, frameSprite, iconDetails, iconPlayers, iconPlanets, iconAge };
+}
+
+/**
+ * Baut die PixiJS-Elemente für das Sektor-Onboarding-Modal (Charaktererstellung)
+ * 
+ * @param {Container} parentContainer - Die Hauptebene (app.stage, auf die das Modal gelegt wird
+ * @param {Object} sheet - Das globale Sprite-Sheet für die Texturen
+ * 
+ * @returns {Container} - Die Referenz auf den fertigen Pixi Container
+ */
+export function buildOnboardingModalPixi(parentContainer, sheet) {
+    const modalContainer = new Container();
+    modalContainer.visible = false;
+
+    const darkOverlay = new Graphics();
+    darkOverlay.rect(-3000, -3000, 6000, 6000);
+    darkOverlay.fill(0x000000);
+    darkOverlay.alpha = 0.85;
+    darkOverlay.eventMode = 'static';
+    modalContainer.addChild(darkOverlay);
+
+    function createPixiUIItem(x, y, width, height, fillTint, fillAlpha, isBtn) {
+        const itemContainer = new Container();
+        itemContainer.position.set(x, y);
+
+        const fill = new NineSliceSprite({
+            texture: sheet.textures['SPR_SciFiMenus_Menu_Item_Background_07'],
+            leftWidth: 120,
+            topHeight: 120, 
+            rightWidth: 120, 
+            bottomHeight: 120
+        });
+        fill.width = width;
+        fill.height = height;
+        fill.tint = fillTint;
+        fill.alpha = fillAlpha;
+        itemContainer.addChild(fill);
+
+        let frame = null;
+        if (isBtn) {
+            frame = new NineSliceSprite({
+                texture: sheet.textures['SPR_SciFiMenus_Menu_Item_Selected_10'],
+                leftWidth: 100, 
+                topHeight: 120, 
+                rightWidth: 140, 
+                bottomHeight: 120
+            });
+        } else {
+            frame = new NineSliceSprite({
+                texture: sheet.textures['SPR_SciFiMenus_Menu_Item_Selected_19'],
+                leftWidth: 100, 
+                topHeight: 120, 
+                rightWidth: 140, 
+                bottomHeight: 120
+            });
+        }
+
+        frame.width = width;
+        frame.height = height;
+        frame.alpha = 0.8;
+        itemContainer.addChild(frame);
+
+        modalContainer.addChild(itemContainer);
+        return { container: itemContainer, fill, frame };
+    }
+
+    const modalBG = new NineSliceSprite({
+        texture: sheet.textures['SPR_SciFiMenus_Frame_Box_Large_12_Background'],
+        leftWidth: 200,
+        topHeight: 200,
+        rightWidth: 200,
+        bottomHeight: 200
+    });
+    modalBG.width = 450;
+    modalBG.height = 550;
+    modalBG.tint = LOGIN_COLORS.PANEL_BG;
+    modalBG.alpha = 1.0;
+    modalContainer.addChild(modalBG);
+
+    const modalFrame = new NineSliceSprite({
+        texture: sheet.textures['SPR_SciFiMenus_Frame_Box_Large_12'],
+        leftWidth: 512,
+        topHeight: 256,
+        rightWidth: 512,
+        bottomHeight: 256
+    });
+    modalFrame.width = 450;
+    modalFrame.height = 550;
+    modalContainer.addChild(modalFrame);
+
+    const avatarBox = new NineSliceSprite({
+        texture: sheet.textures['SPR_SciFiMenus_Menu_Item_Background_05'],
+        leftWidth: 50,
+        topHeight: 50,
+        rightWidth: 50,
+        bottomHeight: 50
+    });
+    avatarBox.width = 150;
+    avatarBox.height = 150;
+    avatarBox.position.set(150, 60); 
+    avatarBox.tint = 0x00f0ff;
+    avatarBox.alpha = 0.2;
+    modalContainer.addChild(avatarBox);
+
+    const iconAvatar = new Sprite(sheet.textures['ICON_SciFiMenus_Menu_Solo_01_Clean']);
+    iconAvatar.anchor.set(0.5);
+    iconAvatar.position.set(225, 132.5); 
+    iconAvatar.scale.set(0.7);
+    iconAvatar.tint = 0xaaaaaa;
+    modalContainer.addChild(iconAvatar);
+
+    const inputName = createPixiUIItem(75, 250, 300, 50, LOGIN_COLORS.PANEL_BG, 0.8, false);
+    const btnMale = createPixiUIItem(75, 320, 140, 50, LOGIN_COLORS.TAB_ACTIVE, 0.6, true);
+    const btnFemale = createPixiUIItem(235, 320, 140, 50, LOGIN_COLORS.TAB_INACTIVE, 0.4, true);
+    const btnCancel = createPixiUIItem(75, 460, 140, 50, LOGIN_COLORS.BTN_DEFAULT, 0.6, true);
+    const btnJoin = createPixiUIItem(235, 460, 140, 50, LOGIN_COLORS.BTN_DEFAULT, 0.6, true);
+
+    parentContainer.addChild(modalContainer);
+    return {
+        container: modalContainer,
+        inputName, btnMale, btnFemale, btnCancel, btnJoin
+    };
 }
\ No newline at end of file
diff --git a/dev/lobby-frontend/style.css b/dev/lobby-frontend/style.css
index 30f1a49..8796fc6 100644
--- a/dev/lobby-frontend/style.css
+++ b/dev/lobby-frontend/style.css
@@ -2,7 +2,7 @@
 @import url('./src/css/layout.css');
 @import url('./src/css/auth.css');
 @import url('./src/css/lobby.css');
-
+@import url('./src/css/onboarding.css');
 
 @media (max-width: 600px) {
     /* --- 1. Login/Registrierungs-Formular skalieren --- */
@@ -95,8 +95,9 @@
     }
 }
 
-@media (max-width: 800px)and (orientation: portrait) {
+@media (max-width: 800px) and (orientation: portrait) {
     #sector-list-container {
+        /* Erzwingt 2 Spalten auf dem Handy */
         grid-template-columns: repeat(2, 270px) !important;
         justify-content: center !important;
     }