diff --git a/backend/main.py b/backend/main.py
index 27fffbb..c8c90b5 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -154,14 +154,14 @@ def read_root():
     }
 
 # Register routers
-from routers import auth, profiles, exercises, exercise_progression_graphs, clubs, club_memberships, skills, training_planning, training_framework_programs, catalogs, maturity_models, matrix_stack_bundle, import_wiki, import_wiki_admin
+from routers import auth, profiles, exercises, exercise_progression_graphs, clubs, club_memberships, club_join_requests, skills, training_planning, training_framework_programs, catalogs, maturity_models, matrix_stack_bundle, import_wiki, import_wiki_admin
 
 app.include_router(auth.router)
 app.include_router(profiles.router)
 app.include_router(exercises.router)
 app.include_router(exercise_progression_graphs.router)
 app.include_router(clubs.router)
-app.include_router(club_memberships.router)
+app.include_router(club_join_requests.router)
 app.include_router(skills.router)
 app.include_router(training_planning.router)
 app.include_router(training_framework_programs.router)
diff --git a/backend/migrations/040_club_membership_requests.sql b/backend/migrations/040_club_membership_requests.sql
new file mode 100644
index 0000000..976981a
--- /dev/null
+++ b/backend/migrations/040_club_membership_requests.sql
@@ -0,0 +1,29 @@
+-- Migration 040: Antrag auf Vereinsbeitritt (pending → accept/reject durch Vereins-/Plattform-Admin)
+
+CREATE TABLE IF NOT EXISTS club_membership_requests (
+    id SERIAL PRIMARY KEY,
+    profile_id INT NOT NULL REFERENCES profiles(id) ON DELETE CASCADE,
+    club_id INT NOT NULL REFERENCES clubs(id) ON DELETE CASCADE,
+    status VARCHAR(20) NOT NULL DEFAULT 'pending'
+        CHECK (status IN ('pending', 'accepted', 'rejected', 'withdrawn')),
+    message TEXT,
+    decided_by_profile_id INT REFERENCES profiles(id) ON DELETE SET NULL,
+    decided_at TIMESTAMP,
+    created_at TIMESTAMP DEFAULT NOW(),
+    updated_at TIMESTAMP DEFAULT NOW()
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS uq_club_membership_requests_pending
+    ON club_membership_requests (profile_id, club_id)
+    WHERE status = 'pending';
+
+CREATE INDEX IF NOT EXISTS idx_club_membership_requests_club_status
+    ON club_membership_requests (club_id, status);
+
+CREATE INDEX IF NOT EXISTS idx_club_membership_requests_profile
+    ON club_membership_requests (profile_id);
+
+DROP TRIGGER IF EXISTS club_membership_requests_update ON club_membership_requests;
+CREATE TRIGGER club_membership_requests_update
+    BEFORE UPDATE ON club_membership_requests
+    FOR EACH ROW EXECUTE FUNCTION update_timestamp();
diff --git a/backend/models.py b/backend/models.py
index f8c9cb9..ecae0d7 100644
--- a/backend/models.py
+++ b/backend/models.py
@@ -19,6 +19,7 @@ class RegisterRequest(BaseModel):
     email: EmailStr
     password: str
     name: Optional[str] = None
+    requested_club_id: Optional[int] = Field(default=None, ge=1)
 
 class PasswordResetRequest(BaseModel):
     email: str
diff --git a/backend/routers/auth.py b/backend/routers/auth.py
index b740576..bdfa1e3 100644
--- a/backend/routers/auth.py
+++ b/backend/routers/auth.py
@@ -302,7 +302,33 @@ async def register(req: RegisterRequest, request: Request):
                 email_verified, verification_token, verification_expires,
                 trial_ends_at, created_at
             ) VALUES (%s, %s, %s, 'email', %s, 'free', FALSE, %s, %s, %s, CURRENT_TIMESTAMP)
+            RETURNING id
         """, (name, email, pin_hash, role, verification_token, verification_expires, trial_ends))
+        new_profile_id = cur.fetchone()["id"]
+
+        req_club = req.requested_club_id
+        if req_club is not None:
+            cur.execute(
+                "SELECT id FROM clubs WHERE id = %s AND status = 'active'",
+                (int(req_club),),
+            )
+            if cur.fetchone():
+                cur.execute(
+                    """
+                    SELECT id FROM club_membership_requests
+                    WHERE profile_id = %s AND club_id = %s AND status = 'pending'
+                    LIMIT 1
+                    """,
+                    (new_profile_id, int(req_club)),
+                )
+                if not cur.fetchone():
+                    cur.execute(
+                        """
+                        INSERT INTO club_membership_requests (profile_id, club_id, status, message)
+                        VALUES (%s, %s, 'pending', NULL)
+                        """,
+                        (new_profile_id, int(req_club)),
+                    )
 
     verify_url = verification_link(verification_token)
 
diff --git a/backend/routers/club_join_requests.py b/backend/routers/club_join_requests.py
new file mode 100644
index 0000000..20dda2b
--- /dev/null
+++ b/backend/routers/club_join_requests.py
@@ -0,0 +1,281 @@
+"""
+Anträge auf Vereinsbeitritt: Nutzer stellt Antrag, Vereins-/Plattform-Admin nimmt an oder lehnt ab.
+"""
+from typing import Any, Dict, List, Optional
+
+from fastapi import APIRouter, Depends, HTTPException
+from pydantic import BaseModel, Field
+
+from auth import require_auth
+from club_tenancy import can_manage_club_org
+from db import get_db, get_cursor, r2d
+
+router = APIRouter(prefix="/api", tags=["club_join_requests"])
+
+_ALLOWED_MEMBER_ROLES = frozenset({"club_admin", "trainer", "division_lead", "content_editor"})
+
+
+def _normalize_roles(raw: List[str]) -> List[str]:
+    out: List[str] = []
+    seen = set()
+    for r in raw:
+        if not isinstance(r, str):
+            raise HTTPException(status_code=400, detail="Rollen müssen Strings sein")
+        code = r.strip().lower()
+        if not code or code not in _ALLOWED_MEMBER_ROLES:
+            raise HTTPException(status_code=400, detail=f"Unbekannte Rolle: {code}")
+        if code not in seen:
+            seen.add(code)
+            out.append(code)
+    return out
+
+
+def _club_active(cur, club_id: int) -> bool:
+    cur.execute("SELECT 1 FROM clubs WHERE id = %s AND status = 'active'", (club_id,))
+    return cur.fetchone() is not None
+
+
+def _assert_manage_club(cur, session: dict, club_id: int) -> None:
+    pid = session["profile_id"]
+    role = session.get("role")
+    if not can_manage_club_org(cur, pid, club_id, role):
+        raise HTTPException(status_code=403, detail="Keine Berechtigung für Mitglieder-Verwaltung in diesem Verein")
+
+
+def _is_active_member(cur, profile_id: int, club_id: int) -> bool:
+    cur.execute(
+        """
+        SELECT 1 FROM club_members
+        WHERE profile_id = %s AND club_id = %s AND status = 'active'
+        LIMIT 1
+        """,
+        (profile_id, club_id),
+    )
+    return cur.fetchone() is not None
+
+
+def _upsert_active_member_with_roles(cur, club_id: int, profile_id: int, roles: List[str]) -> None:
+    roles_n = _normalize_roles(roles)
+    if not roles_n:
+        raise HTTPException(status_code=400, detail="Mindestens eine Rolle angeben")
+    cur.execute(
+        """
+        INSERT INTO club_members (profile_id, club_id, status)
+        VALUES (%s, %s, 'active')
+        ON CONFLICT (profile_id, club_id)
+        DO UPDATE SET status = 'active', updated_at = NOW()
+        RETURNING id
+        """,
+        (profile_id, club_id),
+    )
+    cm_id = cur.fetchone()["id"]
+    cur.execute("DELETE FROM club_member_roles WHERE club_member_id = %s", (cm_id,))
+    for rc in roles_n:
+        cur.execute(
+            """
+            INSERT INTO club_member_roles (club_member_id, role_code)
+            VALUES (%s, %s)
+            ON CONFLICT (club_member_id, role_code) DO NOTHING
+            """,
+            (cm_id, rc),
+        )
+
+
+class JoinRequestCreate(BaseModel):
+    club_id: int = Field(..., ge=1)
+    message: Optional[str] = Field(None, max_length=2000)
+
+
+class JoinRequestAccept(BaseModel):
+    roles: List[str] = Field(default_factory=lambda: ["trainer"])
+
+
+def _response_one(cur, req_id: int, viewer_profile_id: int) -> Dict[str, Any]:
+    cur.execute(
+        """
+        SELECT r.*, c.name AS club_name, c.abbreviation AS club_abbreviation
+        FROM club_membership_requests r
+        INNER JOIN clubs c ON c.id = r.club_id
+        WHERE r.id = %s AND r.profile_id = %s
+        """,
+        (req_id, viewer_profile_id),
+    )
+    row = cur.fetchone()
+    if not row:
+        raise HTTPException(status_code=404, detail="Antrag nicht gefunden")
+    return r2d(row)
+
+
+@router.get("/me/club-join-requests")
+def get_my_join_requests(session: dict = Depends(require_auth)):
+    pid = session["profile_id"]
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            """
+            SELECT r.*, c.name AS club_name, c.abbreviation AS club_abbreviation
+            FROM club_membership_requests r
+            INNER JOIN clubs c ON c.id = r.club_id
+            WHERE r.profile_id = %s
+            ORDER BY r.created_at DESC
+            LIMIT 100
+            """,
+            (pid,),
+        )
+        return [r2d(r) for r in cur.fetchall()]
+
+
+@router.post("/me/club-join-requests", status_code=201)
+def create_my_join_request(body: JoinRequestCreate, session: dict = Depends(require_auth)):
+    """Antrag stellen (nicht möglich wenn bereits aktives Mitglied)."""
+    pid = session["profile_id"]
+    msg = (body.message or "").strip() or None
+    cid = body.club_id
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        if not _club_active(cur, cid):
+            raise HTTPException(status_code=404, detail="Verein nicht gefunden oder nicht aktiv")
+
+        if _is_active_member(cur, pid, cid):
+            raise HTTPException(status_code=400, detail="Du bist bereits Mitglied in diesem Verein")
+
+        cur.execute(
+            """
+            SELECT id FROM club_membership_requests
+            WHERE profile_id = %s AND club_id = %s AND status = 'pending'
+            LIMIT 1
+            """,
+            (pid, cid),
+        )
+        if cur.fetchone():
+            raise HTTPException(status_code=409, detail="Für diesen Verein liegt bereits ein offener Antrag vor")
+
+        cur.execute(
+            """
+            INSERT INTO club_membership_requests (profile_id, club_id, status, message)
+            VALUES (%s, %s, 'pending', %s)
+            RETURNING id
+            """,
+            (pid, cid, msg),
+        )
+        rid = cur.fetchone()["id"]
+        conn.commit()
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        return _response_one(cur, rid, pid)
+
+
+@router.delete("/me/club-join-requests/{request_id}")
+def withdraw_my_join_request(request_id: int, session: dict = Depends(require_auth)):
+    pid = session["profile_id"]
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            """
+            UPDATE club_membership_requests
+            SET status = 'withdrawn', updated_at = NOW()
+            WHERE id = %s AND profile_id = %s AND status = 'pending'
+            RETURNING id
+            """,
+            (request_id, pid),
+        )
+        if not cur.fetchone():
+            raise HTTPException(status_code=404, detail="Offener Antrag nicht gefunden")
+        conn.commit()
+    return {"ok": True}
+
+
+@router.get("/clubs/{club_id}/join-requests")
+def list_club_join_requests(club_id: int, session: dict = Depends(require_auth)):
+    """Offene Anträge für einen Verein (Vereins-/Plattform-Admin)."""
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        _assert_manage_club(cur, session, club_id)
+        cur.execute(
+            """
+            SELECT r.*, p.email AS applicant_email, p.name AS applicant_name
+            FROM club_membership_requests r
+            INNER JOIN profiles p ON p.id = r.profile_id
+            WHERE r.club_id = %s AND r.status = 'pending'
+            ORDER BY r.created_at ASC
+            """,
+            (club_id,),
+        )
+        return [r2d(r) for r in cur.fetchall()]
+
+
+@router.post("/clubs/{club_id}/join-requests/{request_id}/accept")
+def accept_club_join_request(
+    club_id: int,
+    request_id: int,
+    body: JoinRequestAccept,
+    session: dict = Depends(require_auth),
+):
+    admin_pid = session["profile_id"]
+    roles = _normalize_roles(body.roles)
+
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        _assert_manage_club(cur, session, club_id)
+
+        cur.execute(
+            """
+            SELECT id, profile_id, status FROM club_membership_requests
+            WHERE id = %s AND club_id = %s
+            """,
+            (request_id, club_id),
+        )
+        row = cur.fetchone()
+        if not row:
+            raise HTTPException(status_code=404, detail="Antrag nicht gefunden")
+        if row["status"] != "pending":
+            raise HTTPException(status_code=400, detail="Antrag ist nicht mehr offen")
+
+        applicant_id = row["profile_id"]
+
+        cur.execute(
+            """
+            UPDATE club_membership_requests
+            SET status = 'accepted',
+                decided_by_profile_id = %s,
+                decided_at = NOW(),
+                updated_at = NOW()
+            WHERE id = %s AND club_id = %s AND status = 'pending'
+            RETURNING id
+            """,
+            (admin_pid, request_id, club_id),
+        )
+        if not cur.fetchone():
+            raise HTTPException(status_code=409, detail="Antrag konnte nicht angenommen werden")
+
+        _upsert_active_member_with_roles(cur, club_id, applicant_id, roles)
+        conn.commit()
+
+    return {"ok": True, "profile_id": applicant_id, "club_id": club_id}
+
+
+@router.post("/clubs/{club_id}/join-requests/{request_id}/reject")
+def reject_club_join_request(club_id: int, request_id: int, session: dict = Depends(require_auth)):
+    admin_pid = session["profile_id"]
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        _assert_manage_club(cur, session, club_id)
+
+        cur.execute(
+            """
+            UPDATE club_membership_requests
+            SET status = 'rejected',
+                decided_by_profile_id = %s,
+                decided_at = NOW(),
+                updated_at = NOW()
+            WHERE id = %s AND club_id = %s AND status = 'pending'
+            RETURNING id
+            """,
+            (admin_pid, request_id, club_id),
+        )
+        if not cur.fetchone():
+            raise HTTPException(status_code=404, detail="Offener Antrag nicht gefunden")
+        conn.commit()
+    return {"ok": True}
diff --git a/backend/routers/clubs.py b/backend/routers/clubs.py
index bcfb2ed..841a33d 100644
--- a/backend/routers/clubs.py
+++ b/backend/routers/clubs.py
@@ -57,6 +57,48 @@ def list_clubs(
         return [r2d(r) for r in rows]
 
 
+# ── Öffentliches Vereinsverzeichnis (Registrierung / Antrag ohne Mitgliedschaft) ──
+@router.get("/clubs/public-directory")
+def public_club_directory():
+    """Aktive Vereine zur Auswahl bei Registrierung oder Beitrittsantrag (nur id, name, Kürzel)."""
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cur.execute(
+            """
+            SELECT id, name, abbreviation
+            FROM clubs
+            WHERE status = 'active'
+            ORDER BY name
+            """
+        )
+        return [r2d(r) for r in cur.fetchall()]
+
+
+# ── Aktive Mitglieder für Trainer-/Co-Trainer-Auswahl (jeder Vereinsmitglied) ──
+@router.get("/clubs/{club_id}/members/directory")
+def club_members_directory(club_id: int, session=Depends(require_auth)):
+    profile_id = session["profile_id"]
+    role = session.get("role")
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        if not is_platform_admin(role):
+            assert_club_member(cur, profile_id, club_id)
+        cur.execute("SELECT 1 FROM clubs WHERE id = %s", (club_id,))
+        if not cur.fetchone():
+            raise HTTPException(404, "Verein nicht gefunden")
+        cur.execute(
+            """
+            SELECT p.id, p.name, p.email
+            FROM club_members cm
+            INNER JOIN profiles p ON p.id = cm.profile_id
+            WHERE cm.club_id = %s AND cm.status = 'active'
+            ORDER BY COALESCE(p.name, ''), p.email
+            """,
+            (club_id,),
+        )
+        return [r2d(r) for r in cur.fetchall()]
+
+
 # ── Get Club ──────────────────────────────────────────────────────────
 @router.get("/clubs/{club_id}")
 def get_club(club_id: int, session=Depends(require_auth)):
diff --git a/backend/routers/profiles.py b/backend/routers/profiles.py
index ca78d09..035d42c 100644
--- a/backend/routers/profiles.py
+++ b/backend/routers/profiles.py
@@ -11,7 +11,7 @@ from fastapi import APIRouter, HTTPException, Header, Depends
 
 from db import get_db, get_cursor, r2d
 from auth import require_auth
-from club_tenancy import assert_club_member, memberships_with_roles
+from club_tenancy import assert_club_member, memberships_with_roles, is_platform_admin
 from models import ProfileCreate, ProfileUpdate
 
 router = APIRouter(prefix="/api", tags=["profiles"])
@@ -50,12 +50,20 @@ def get_current_profile(session=Depends(require_auth)):
 # ── Admin Profile Management ──────────────────────────────────────────────────
 @router.get("/profiles")
 def list_profiles(session=Depends(require_auth)):
-    """List all profiles (admin)."""
+    """Liste aller Profile (nur Plattform-Admin)."""
+    role = (session.get("role") or "").lower()
+    if not is_platform_admin(role):
+        raise HTTPException(status_code=403, detail="Nur Plattform-Administratoren dürfen alle Profile einsehen")
     with get_db() as conn:
         cur = get_cursor(conn)
         cur.execute("SELECT * FROM profiles ORDER BY created")
         rows = cur.fetchall()
-        return [r2d(r) for r in rows]
+        out = []
+        for r in rows:
+            d = r2d(r)
+            d.pop("pin_hash", None)
+            out.append(d)
+        return out
 
 
 @router.post("/profiles")
diff --git a/backend/version.py b/backend/version.py
index 4a8a9d1..c075971 100644
--- a/backend/version.py
+++ b/backend/version.py
@@ -1,14 +1,15 @@
 # Shinkan Jinkendo Version Information
 
-APP_VERSION = "0.8.17"
+APP_VERSION = "0.8.18"
 BUILD_DATE = "2026-05-05"
-DB_SCHEMA_VERSION = "20260505039"
+DB_SCHEMA_VERSION = "20260505040"
 
 MODULE_VERSIONS = {
-    "auth": "1.0.0",
-    "profiles": "1.1.0",  # /profiles/me: clubs[], pin_hash ausgeblendet, active_club_id
-    "clubs": "0.3.0",
+    "auth": "1.1.0",  # Registrierung: optional requested_club_id → Beitrittsantrag
+    "profiles": "1.2.0",  # GET /profiles nur Plattform-Admin; pin_hash aus Liste entfernt
+    "clubs": "0.4.0",  # public-directory, members/directory; Vereins-GUI verwendet Endpoints
     "club_memberships": "1.0.0",
+    "club_join_requests": "1.0.0",
     "groups": "0.1.0",
     "skills": "0.1.0",
     "methods": "0.1.0",
@@ -24,6 +25,15 @@ MODULE_VERSIONS = {
 }
 
 CHANGELOG = [
+    {
+        "version": "0.8.18",
+        "date": "2026-05-05",
+        "changes": [
+            "DB 040 club_membership_requests; API Antrag/Abrufen/annehmen/ablehnen; öffentliches Vereinsverzeichnis; Mitglieder-Directory für Trainerwahl",
+            "GUI: Vereinsverwaltung Tab Mitglieder & Anträge; Registrierung/Einstellungen Vereinsantrag; Gruppenformular Haupt- und Co-Trainer",
+            "GET /profiles nur noch für Plattform-Admins",
+        ],
+    },
     {
         "version": "0.8.17",
         "date": "2026-05-05",
diff --git a/frontend/src/pages/AccountSettingsPage.jsx b/frontend/src/pages/AccountSettingsPage.jsx
index cba52d3..ea6634c 100644
--- a/frontend/src/pages/AccountSettingsPage.jsx
+++ b/frontend/src/pages/AccountSettingsPage.jsx
@@ -10,6 +10,12 @@ function AccountSettingsPage() {
   const [name, setName] = useState('')
   const [savingProfile, setSavingProfile] = useState(false)
 
+  const [publicClubsDir, setPublicClubsDir] = useState([])
+  const [myJoinRequests, setMyJoinRequests] = useState([])
+  const [joinClubId, setJoinClubId] = useState('')
+  const [joinMessage, setJoinMessage] = useState('')
+  const [joinBusy, setJoinBusy] = useState(false)
+
   const [newPw1, setNewPw1] = useState('')
   const [newPw2, setNewPw2] = useState('')
   const [savingPw, setSavingPw] = useState(false)
@@ -22,6 +28,32 @@ function AccountSettingsPage() {
     setName(typeof user?.name === 'string' ? user.name : '')
   }, [user])
 
+  const refreshJoinRequests = () => {
+    api.getMyClubJoinRequests().then(setMyJoinRequests).catch(() => {})
+  }
+
+  useEffect(() => {
+    if (!user?.id) return
+    api.listPublicClubsDirectory().then(setPublicClubsDir).catch(() => {})
+    refreshJoinRequests()
+  }, [user?.id])
+
+  const memberClubIds = new Set((user?.clubs || []).map((c) => c.id))
+  const pendingClubIds = new Set(
+    myJoinRequests.filter((r) => r.status === 'pending').map((r) => r.club_id)
+  )
+  const joinClubChoices = publicClubsDir.filter(
+    (c) => !memberClubIds.has(c.id) && !pendingClubIds.has(c.id)
+  )
+
+  const joinStatusLabel = (s) =>
+    ({
+      pending: 'ausstehend',
+      accepted: 'angenommen',
+      rejected: 'abgelehnt',
+      withdrawn: 'zurückgezogen',
+    })[s] || s
+
   /** API: boolean true / Legacy: fehlt oder false → als „nicht verifiziert“ behandeln */
   const emailExplicitlyVerified =
     user?.email_verified === true ||
@@ -214,9 +246,133 @@ function AccountSettingsPage() {
           <span style={{ textTransform: 'uppercase', letterSpacing: '0.03em', fontWeight: 600 }}>
             {user?.tier || 'free'}
           </span>
+
+          <strong style={{ color: 'var(--text2)' }}>Vereine</strong>
+          <span style={{ lineHeight: 1.45 }}>
+            {user?.clubs?.length ? (
+              <>
+                {user.clubs.map((c) => (
+                  <div key={c.id}>
+                    <strong style={{ color: 'var(--text1)' }}>{c.name}</strong>
+                    {': '}
+                    {(c.roles || []).length ? (c.roles || []).join(', ') : '—'}
+                  </div>
+                ))}
+              </>
+            ) : (
+              '—'
+            )}
+          </span>
         </div>
       </div>
 
+      <div className="card" style={{ marginBottom: '1rem' }}>
+        <h2 style={{ margin: '0 0 0.75rem', fontSize: '1.1rem' }}>Vereinsbeitritt</h2>
+        <p style={{ color: 'var(--text2)', fontSize: '0.875rem', marginBottom: '1rem', lineHeight: 1.5 }}>
+          Beantrage die Mitgliedschaft in einem Verein. Vereinsadministratoren können den Antrag unter
+          „Vereinsverwaltung → Mitglieder“ annehmen oder ablehnen.
+        </p>
+
+        {myJoinRequests.length > 0 && (
+          <div style={{ marginBottom: '1rem' }}>
+            <strong style={{ fontSize: '0.9rem' }}>Meine Anträge</strong>
+            <ul style={{ margin: '0.5rem 0 0', paddingLeft: '1.25rem', color: 'var(--text2)', fontSize: '0.9rem' }}>
+              {myJoinRequests.map((r) => (
+                <li key={r.id} style={{ marginBottom: '0.35rem' }}>
+                  {r.club_name || `Verein #${r.club_id}`} — {joinStatusLabel(r.status)}
+                  {r.status === 'pending' ? (
+                    <>
+                      {' '}
+                      <button
+                        type="button"
+                        style={{
+                          marginLeft: '0.35rem',
+                          fontSize: '0.75rem',
+                          padding: '0.15rem 0.45rem',
+                          borderRadius: '6px',
+                          border: '1px solid var(--border)',
+                          background: 'var(--surface2)',
+                          cursor: 'pointer',
+                        }}
+                        onClick={async () => {
+                          if (!confirm('Antrag wirklich zurückziehen?')) return
+                          try {
+                            await api.withdrawClubJoinRequest(r.id)
+                            refreshJoinRequests()
+                          } catch (err) {
+                            showErr(err.message || 'Zurückziehen fehlgeschlagen.')
+                          }
+                        }}
+                      >
+                        zurückziehen
+                      </button>
+                    </>
+                  ) : null}
+                </li>
+              ))}
+            </ul>
+          </div>
+        )}
+
+        <form
+          onSubmit={async (e) => {
+            e.preventDefault()
+            if (!joinClubId) {
+              showErr('Bitte einen Verein auswählen.')
+              return
+            }
+            setJoinBusy(true)
+            try {
+              await api.createClubJoinRequest({
+                club_id: parseInt(joinClubId, 10),
+                message: (joinMessage || '').trim() || undefined,
+              })
+              setJoinMessage('')
+              setJoinClubId('')
+              refreshJoinRequests()
+              await checkAuth()
+              showOk('Antrag gesendet.')
+            } catch (err) {
+              showErr(err.message || 'Antrag fehlgeschlagen.')
+            } finally {
+              setJoinBusy(false)
+            }
+          }}
+        >
+          <label className="form-label" htmlFor="join-club-select">
+            Verein auswählen
+          </label>
+          <select
+            id="join-club-select"
+            className="form-input"
+            value={joinClubId}
+            onChange={(e) => setJoinClubId(e.target.value)}
+          >
+            <option value="">—</option>
+            {joinClubChoices.map((c) => (
+              <option key={c.id} value={String(c.id)}>
+                {c.name}
+                {c.abbreviation ? ` (${c.abbreviation})` : ''}
+              </option>
+            ))}
+          </select>
+          <label className="form-label" htmlFor="join-msg" style={{ marginTop: '0.75rem' }}>
+            Nachricht (optional)
+          </label>
+          <textarea
+            id="join-msg"
+            className="form-input"
+            rows={2}
+            value={joinMessage}
+            onChange={(e) => setJoinMessage(e.target.value)}
+            placeholder="z. B. Trainingsgruppe oder Kontakt zum Verein"
+          />
+          <button type="submit" className="btn btn-primary" disabled={joinBusy} style={{ marginTop: '0.85rem' }}>
+            {joinBusy ? 'Senden…' : 'Beitritt beantragen'}
+          </button>
+        </form>
+      </div>
+
       <div className="card">
         <h2 style={{ margin: '0 0 0.75rem', fontSize: '1.1rem' }}>Passwort ändern</h2>
         <p style={{ color: 'var(--text2)', fontSize: '0.875rem', marginBottom: '1rem', lineHeight: 1.5 }}>
diff --git a/frontend/src/pages/ClubsPage.jsx b/frontend/src/pages/ClubsPage.jsx
index 70ae42c..92379ec 100644
--- a/frontend/src/pages/ClubsPage.jsx
+++ b/frontend/src/pages/ClubsPage.jsx
@@ -2,6 +2,13 @@ import React, { useState, useEffect } from 'react'
 import api from '../utils/api'
 import { useAuth } from '../context/AuthContext'
 
+const CLUB_ROLE_OPTIONS = [
+  { code: 'club_admin', label: 'Vereinsadmin' },
+  { code: 'trainer', label: 'Trainer' },
+  { code: 'division_lead', label: 'Spartenleitung' },
+  { code: 'content_editor', label: 'Inhalte bearbeiten' },
+]
+
 function ClubsPage() {
   const { user } = useAuth()
   const [activeTab, setActiveTab] = useState('clubs')
@@ -13,6 +20,19 @@ function ClubsPage() {
   const [editing, setEditing] = useState(null)
   const [modalType, setModalType] = useState('club')
 
+  const [membersAdminClubId, setMembersAdminClubId] = useState(null)
+  const [clubMembersAdmin, setClubMembersAdmin] = useState([])
+  const [joinRequestsAdmin, setJoinRequestsAdmin] = useState([])
+  const [membersAdminLoading, setMembersAdminLoading] = useState(false)
+  const [groupMemberDirectory, setGroupMemberDirectory] = useState([])
+
+  const [showAddMemberModal, setShowAddMemberModal] = useState(false)
+  const [profilesAdminList, setProfilesAdminList] = useState([])
+  const [addMemberForm, setAddMemberForm] = useState({ profile_id: '', roles: ['trainer'] })
+
+  const [editMemberModal, setEditMemberModal] = useState(null)
+  const [acceptJoinModal, setAcceptJoinModal] = useState(null)
+
   // Form state
   const [formData, setFormData] = useState({})
 
@@ -58,6 +78,70 @@ function ClubsPage() {
     }
   }
 
+  useEffect(() => {
+    if (!clubs.length) {
+      setMembersAdminClubId(null)
+      return
+    }
+    const mcl = clubs.filter((c) => isPlatformAdmin || clubAdminClubIds.has(c.id))
+    if (!mcl.length) {
+      setMembersAdminClubId(null)
+      return
+    }
+    setMembersAdminClubId((prev) =>
+      prev != null && mcl.some((x) => x.id === prev) ? prev : mcl[0].id
+    )
+  }, [clubs, isPlatformAdmin, user?.clubs])
+
+  useEffect(() => {
+    if (activeTab !== 'members' || !membersAdminClubId || !canManageClub(membersAdminClubId)) return
+    let cancelled = false
+    setMembersAdminLoading(true)
+    Promise.all([
+      api.listClubMembers(membersAdminClubId, { includeInactive: true }),
+      api.listClubJoinRequests(membersAdminClubId),
+    ])
+      .then(([m, j]) => {
+        if (!cancelled) {
+          setClubMembersAdmin(m)
+          setJoinRequestsAdmin(j)
+        }
+      })
+      .catch((err) => {
+        if (!cancelled) alert('Mitglieder/Anträge: ' + err.message)
+      })
+      .finally(() => {
+        if (!cancelled) setMembersAdminLoading(false)
+      })
+    return () => {
+      cancelled = true
+    }
+  }, [activeTab, membersAdminClubId])
+
+  useEffect(() => {
+    if (!showModal || modalType !== 'group' || !formData.club_id) {
+      setGroupMemberDirectory([])
+      return
+    }
+    let cancelled = false
+    api
+      .clubMembersDirectory(formData.club_id)
+      .then((rows) => {
+        if (!cancelled) setGroupMemberDirectory(rows)
+      })
+      .catch(() => {
+        if (!cancelled) setGroupMemberDirectory([])
+      })
+    return () => {
+      cancelled = true
+    }
+  }, [showModal, modalType, formData.club_id])
+
+  useEffect(() => {
+    if (!showAddMemberModal || !isPlatformAdmin) return
+    api.listProfiles().then(setProfilesAdminList).catch(() => setProfilesAdminList([]))
+  }, [showAddMemberModal, isPlatformAdmin])
+
   const handleCreate = (type) => {
     setEditing(null)
     setModalType(type)
@@ -93,10 +177,34 @@ function ClubsPage() {
     setShowModal(true)
   }
 
+  const manageableClubs = clubs.filter((c) => canManageClub(c.id))
+
+  const reloadMembersAdmin = async () => {
+    if (!membersAdminClubId || !canManageClub(membersAdminClubId)) return
+    try {
+      const [m, j] = await Promise.all([
+        api.listClubMembers(membersAdminClubId, { includeInactive: true }),
+        api.listClubJoinRequests(membersAdminClubId),
+      ])
+      setClubMembersAdmin(m)
+      setJoinRequestsAdmin(j)
+    } catch (err) {
+      console.error(err)
+    }
+  }
+
   const handleEdit = (item, type) => {
     setEditing(item)
     setModalType(type)
-    setFormData({ ...item })
+    if (type === 'group') {
+      const co = item.co_trainer_ids
+      setFormData({
+        ...item,
+        co_trainer_ids: Array.isArray(co) ? co : [],
+      })
+    } else {
+      setFormData({ ...item })
+    }
     setShowModal(true)
   }
 
@@ -145,10 +253,24 @@ function ClubsPage() {
           await api.createDivision(formData)
         }
       } else if (modalType === 'group') {
+        const trainerRaw = formData.trainer_id
+        const trainer_id =
+          trainerRaw === '' || trainerRaw === undefined || trainerRaw === null
+            ? null
+            : Number(trainerRaw)
+        const coRaw = formData.co_trainer_ids
+        const co_trainer_ids = Array.isArray(coRaw)
+          ? coRaw.map((x) => Number(x)).filter((n) => Number.isFinite(n))
+          : []
+        const payload = {
+          ...formData,
+          trainer_id: Number.isFinite(trainer_id) ? trainer_id : null,
+          co_trainer_ids,
+        }
         if (editing) {
-          await api.updateTrainingGroup(editing.id, formData)
+          await api.updateTrainingGroup(editing.id, payload)
         } else {
-          await api.createTrainingGroup(formData)
+          await api.createTrainingGroup(payload)
         }
       }
 
@@ -187,7 +309,10 @@ function ClubsPage() {
           marginBottom: '1.5rem',
           borderBottom: '2px solid var(--border)'
         }}>
-          {['clubs', 'divisions', 'groups'].map(tab => (
+          {(canManageOrgSomewhere
+            ? ['clubs', 'divisions', 'groups', 'members']
+            : ['clubs', 'divisions', 'groups']
+          ).map(tab => (
             <button
               key={tab}
               onClick={() => setActiveTab(tab)}
@@ -204,6 +329,7 @@ function ClubsPage() {
               {tab === 'clubs' && 'Vereine'}
               {tab === 'divisions' && 'Sparten'}
               {tab === 'groups' && 'Trainingsgruppen'}
+              {tab === 'members' && 'Mitglieder'}
             </button>
           ))}
         </div>
@@ -440,6 +566,156 @@ function ClubsPage() {
           </>
         )}
 
+        {activeTab === 'members' && canManageOrgSomewhere && (
+          <>
+            <div style={{ display: 'flex', justifyContent: 'space-between', marginBottom: '1rem', flexWrap: 'wrap', gap: '0.75rem' }}>
+              <h2>Mitglieder &amp; Beitrittsanträge</h2>
+              <div style={{ display: 'flex', gap: '0.5rem', alignItems: 'center', flexWrap: 'wrap' }}>
+                <label style={{ color: 'var(--text2)', fontSize: '0.875rem' }}>Verein</label>
+                <select
+                  className="form-input"
+                  style={{ minWidth: '200px' }}
+                  value={membersAdminClubId ?? ''}
+                  onChange={(e) =>
+                    setMembersAdminClubId(e.target.value ? parseInt(e.target.value, 10) : null)
+                  }
+                >
+                  {manageableClubs.map((c) => (
+                    <option key={c.id} value={c.id}>
+                      {c.name}
+                    </option>
+                  ))}
+                </select>
+                <button
+                  type="button"
+                  className="btn btn-primary"
+                  onClick={() => {
+                    setAddMemberForm({ profile_id: '', roles: ['trainer'] })
+                    setShowAddMemberModal(true)
+                  }}
+                >
+                  Mitglied hinzufügen
+                </button>
+              </div>
+            </div>
+
+            {manageableClubs.length === 0 ? (
+              <div className="card">
+                <p style={{ color: 'var(--text2)' }}>
+                  Keine Vereine, für die du Mitglieder verwalten darfst.
+                </p>
+              </div>
+            ) : membersAdminLoading ? (
+              <p style={{ color: 'var(--text2)' }}>Laden…</p>
+            ) : (
+              <>
+                {joinRequestsAdmin.length > 0 && (
+                  <div className="card" style={{ marginBottom: '1rem' }}>
+                    <h3 style={{ marginTop: 0 }}>Offene Beitrittsanträge</h3>
+                    <div style={{ display: 'grid', gap: '0.75rem' }}>
+                      {joinRequestsAdmin.map((req) => (
+                        <div
+                          key={req.id}
+                          style={{
+                            padding: '0.75rem',
+                            borderRadius: '8px',
+                            border: '1px solid var(--border)',
+                            display: 'flex',
+                            justifyContent: 'space-between',
+                            flexWrap: 'wrap',
+                            gap: '0.5rem',
+                          }}
+                        >
+                          <div>
+                            <strong>{req.applicant_name || req.applicant_email || 'Nutzer'}</strong>
+                            <div style={{ fontSize: '0.85rem', color: 'var(--text2)' }}>
+                              {req.applicant_email} · Profil #{req.profile_id}
+                            </div>
+                            {req.message ? (
+                              <div style={{ marginTop: '0.35rem', fontSize: '0.875rem' }}>{req.message}</div>
+                            ) : null}
+                          </div>
+                          <div style={{ display: 'flex', gap: '0.35rem', flexWrap: 'wrap' }}>
+                            <button
+                              type="button"
+                              className="btn btn-primary"
+                              onClick={() =>
+                                setAcceptJoinModal({
+                                  id: req.id,
+                                  label: req.applicant_name || req.applicant_email,
+                                  roles: ['trainer'],
+                                })
+                              }
+                            >
+                              Annehmen
+                            </button>
+                            <button
+                              type="button"
+                              className="btn btn-secondary"
+                              onClick={async () => {
+                                if (!confirm('Antrag ablehnen?')) return
+                                try {
+                                  await api.rejectClubJoinRequest(membersAdminClubId, req.id)
+                                  await reloadMembersAdmin()
+                                } catch (err) {
+                                  alert(err.message || String(err))
+                                }
+                              }}
+                            >
+                              Ablehnen
+                            </button>
+                          </div>
+                        </div>
+                      ))}
+                    </div>
+                  </div>
+                )}
+
+                <div className="card">
+                  <h3 style={{ marginTop: 0 }}>Mitglieder</h3>
+                  {clubMembersAdmin.length === 0 ? (
+                    <p style={{ color: 'var(--text2)' }}>Noch keine Mitglieder erfasst.</p>
+                  ) : (
+                    <div style={{ display: 'grid', gap: '0.65rem' }}>
+                      {clubMembersAdmin.map((m) => (
+                        <div
+                          key={m.membership_id}
+                          style={{
+                            padding: '0.65rem',
+                            borderRadius: '8px',
+                            background: 'var(--surface2)',
+                            display: 'flex',
+                            justifyContent: 'space-between',
+                            flexWrap: 'wrap',
+                            gap: '0.5rem',
+                          }}
+                        >
+                          <div>
+                            <strong>{m.name || m.email}</strong>
+                            <div style={{ fontSize: '0.8rem', color: 'var(--text2)' }}>
+                              {m.email} · #{m.profile_id} · {m.status}
+                            </div>
+                            <div style={{ fontSize: '0.8rem', marginTop: '0.25rem' }}>
+                              Rollen: {(m.roles || []).join(', ') || '—'}
+                            </div>
+                          </div>
+                          <button
+                            type="button"
+                            className="btn btn-secondary"
+                            onClick={() => setEditMemberModal(m)}
+                          >
+                            Bearbeiten
+                          </button>
+                        </div>
+                      ))}
+                    </div>
+                  )}
+                </div>
+              </>
+            )}
+          </>
+        )}
+
         {/* Modal */}
         {showModal && (
           <div style={{
@@ -718,6 +994,50 @@ function ClubsPage() {
                       />
                     </div>
 
+                    <div className="form-row">
+                      <label className="form-label">Haupttrainer</label>
+                      <select
+                        className="form-input"
+                        value={formData.trainer_id != null ? String(formData.trainer_id) : ''}
+                        onChange={(e) =>
+                          updateFormField(
+                            'trainer_id',
+                            e.target.value === '' ? '' : parseInt(e.target.value, 10)
+                          )
+                        }
+                      >
+                        <option value="">—</option>
+                        {groupMemberDirectory.map((p) => (
+                          <option key={p.id} value={p.id}>
+                            {(p.name || p.email || '').trim()} (#{p.id})
+                          </option>
+                        ))}
+                      </select>
+                      <p style={{ fontSize: '0.75rem', color: 'var(--text3)', marginTop: '0.35rem' }}>
+                        Liste = aktive Vereinsmitglieder. Nach Zuweisungen ggf. Seite neu laden.
+                      </p>
+                    </div>
+
+                    <div className="form-row">
+                      <label className="form-label">Co-Trainer (Mehrfachauswahl)</label>
+                      <select
+                        multiple
+                        className="form-input"
+                        size={Math.min(8, Math.max(4, groupMemberDirectory.length || 4))}
+                        value={(formData.co_trainer_ids || []).map(String)}
+                        onChange={(e) => {
+                          const opts = [...e.target.selectedOptions].map((o) => parseInt(o.value, 10))
+                          updateFormField('co_trainer_ids', opts)
+                        }}
+                      >
+                        {groupMemberDirectory.map((p) => (
+                          <option key={p.id} value={p.id}>
+                            {(p.name || p.email || '').trim()} (#{p.id})
+                          </option>
+                        ))}
+                      </select>
+                    </div>
+
                     <div className="form-row">
                       <label className="form-label">Status</label>
                       <select
@@ -749,6 +1069,340 @@ function ClubsPage() {
             </div>
           </div>
         )}
+
+        {showAddMemberModal && membersAdminClubId && (
+          <div
+            style={{
+              position: 'fixed',
+              top: 0,
+              left: 0,
+              right: 0,
+              bottom: 0,
+              background: 'rgba(0,0,0,0.5)',
+              display: 'flex',
+              alignItems: 'center',
+              justifyContent: 'center',
+              zIndex: 1100,
+              padding: '1rem',
+            }}
+          >
+            <div
+              style={{
+                background: 'var(--surface)',
+                borderRadius: '12px',
+                padding: '1.5rem',
+                maxWidth: '480px',
+                width: '100%',
+              }}
+            >
+              <h2 style={{ marginTop: 0 }}>Mitglied hinzufügen</h2>
+              <p style={{ color: 'var(--text2)', fontSize: '0.875rem' }}>
+                {isPlatformAdmin
+                  ? 'Nutzer aus der Liste wählen oder Profil-ID eingeben.'
+                  : 'Profil-ID des Nutzers (z. B. aus der Nutzerverwaltung). Offene Beitrittsanträge kannst du oben direkt annehmen.'}
+              </p>
+              {isPlatformAdmin && profilesAdminList.length > 0 ? (
+                <div className="form-row">
+                  <label className="form-label">Profil</label>
+                  <select
+                    className="form-input"
+                    value={addMemberForm.profile_id === '' ? '' : String(addMemberForm.profile_id)}
+                    onChange={(e) =>
+                      setAddMemberForm((prev) => ({ ...prev, profile_id: e.target.value }))
+                    }
+                  >
+                    <option value="">Bitte wählen…</option>
+                    {profilesAdminList.map((p) => (
+                      <option key={p.id} value={p.id}>
+                        #{p.id} — {p.email || '—'} ({p.name || 'ohne Name'})
+                      </option>
+                    ))}
+                  </select>
+                </div>
+              ) : (
+                <div className="form-row">
+                  <label className="form-label">Profil-ID</label>
+                  <input
+                    type="number"
+                    min={1}
+                    className="form-input"
+                    value={addMemberForm.profile_id}
+                    onChange={(e) =>
+                      setAddMemberForm((prev) => ({
+                        ...prev,
+                        profile_id: e.target.value === '' ? '' : parseInt(e.target.value, 10),
+                      }))
+                    }
+                  />
+                </div>
+              )}
+              <div className="form-row">
+                <span className="form-label">Rollen</span>
+                <div style={{ display: 'flex', flexDirection: 'column', gap: '0.35rem' }}>
+                  {CLUB_ROLE_OPTIONS.map((opt) => (
+                    <label key={opt.code} style={{ display: 'flex', alignItems: 'center', gap: '0.35rem' }}>
+                      <input
+                        type="checkbox"
+                        checked={addMemberForm.roles.includes(opt.code)}
+                        onChange={() => {
+                          setAddMemberForm((prev) => {
+                            const set = new Set(prev.roles)
+                            if (set.has(opt.code)) set.delete(opt.code)
+                            else set.add(opt.code)
+                            return { ...prev, roles: Array.from(set) }
+                          })
+                        }}
+                      />
+                      {opt.label}
+                    </label>
+                  ))}
+                </div>
+              </div>
+              <div style={{ display: 'flex', gap: '0.5rem', marginTop: '1rem' }}>
+                <button
+                  type="button"
+                  className="btn btn-primary"
+                  style={{ flex: 1 }}
+                  onClick={async () => {
+                    const raw = addMemberForm.profile_id
+                    const profile_id = typeof raw === 'number' ? raw : parseInt(String(raw), 10)
+                    if (!Number.isFinite(profile_id) || profile_id < 1) {
+                      alert('Gültige Profil-ID wählen.')
+                      return
+                    }
+                    if (!addMemberForm.roles.length) {
+                      alert('Mindestens eine Rolle.')
+                      return
+                    }
+                    try {
+                      await api.addClubMember(membersAdminClubId, {
+                        profile_id,
+                        roles: addMemberForm.roles,
+                      })
+                      setShowAddMemberModal(false)
+                      await reloadMembersAdmin()
+                      await loadData()
+                    } catch (err) {
+                      alert(err.message || String(err))
+                    }
+                  }}
+                >
+                  Hinzufügen
+                </button>
+                <button
+                  type="button"
+                  className="btn btn-secondary"
+                  onClick={() => setShowAddMemberModal(false)}
+                >
+                  Abbrechen
+                </button>
+              </div>
+            </div>
+          </div>
+        )}
+
+        {acceptJoinModal && membersAdminClubId && (
+          <div
+            style={{
+              position: 'fixed',
+              top: 0,
+              left: 0,
+              right: 0,
+              bottom: 0,
+              background: 'rgba(0,0,0,0.5)',
+              display: 'flex',
+              alignItems: 'center',
+              justifyContent: 'center',
+              zIndex: 1100,
+              padding: '1rem',
+            }}
+          >
+            <div
+              style={{
+                background: 'var(--surface)',
+                borderRadius: '12px',
+                padding: '1.5rem',
+                maxWidth: '480px',
+                width: '100%',
+              }}
+            >
+              <h2 style={{ marginTop: 0 }}>Antrag annehmen</h2>
+              <p style={{ color: 'var(--text2)' }}>{acceptJoinModal.label}</p>
+              <div className="form-row">
+                <span className="form-label">Rollen bei Aufnahme</span>
+                <div style={{ display: 'flex', flexDirection: 'column', gap: '0.35rem' }}>
+                  {CLUB_ROLE_OPTIONS.map((opt) => (
+                    <label key={opt.code} style={{ display: 'flex', alignItems: 'center', gap: '0.35rem' }}>
+                      <input
+                        type="checkbox"
+                        checked={acceptJoinModal.roles.includes(opt.code)}
+                        onChange={() => {
+                          setAcceptJoinModal((prev) => {
+                            if (!prev) return prev
+                            const set = new Set(prev.roles)
+                            if (set.has(opt.code)) set.delete(opt.code)
+                            else set.add(opt.code)
+                            const roles = Array.from(set)
+                            return { ...prev, roles: roles.length ? roles : ['trainer'] }
+                          })
+                        }}
+                      />
+                      {opt.label}
+                    </label>
+                  ))}
+                </div>
+              </div>
+              <div style={{ display: 'flex', gap: '0.5rem', marginTop: '1rem' }}>
+                <button
+                  type="button"
+                  className="btn btn-primary"
+                  style={{ flex: 1 }}
+                  onClick={async () => {
+                    try {
+                      await api.acceptClubJoinRequest(
+                        membersAdminClubId,
+                        acceptJoinModal.id,
+                        acceptJoinModal.roles.length ? acceptJoinModal.roles : ['trainer']
+                      )
+                      setAcceptJoinModal(null)
+                      await reloadMembersAdmin()
+                      await loadData()
+                    } catch (err) {
+                      alert(err.message || String(err))
+                    }
+                  }}
+                >
+                  Aufnehmen
+                </button>
+                <button
+                  type="button"
+                  className="btn btn-secondary"
+                  onClick={() => setAcceptJoinModal(null)}
+                >
+                  Abbrechen
+                </button>
+              </div>
+            </div>
+          </div>
+        )}
+
+        {editMemberModal && membersAdminClubId && (
+          <div
+            style={{
+              position: 'fixed',
+              top: 0,
+              left: 0,
+              right: 0,
+              bottom: 0,
+              background: 'rgba(0,0,0,0.5)',
+              display: 'flex',
+              alignItems: 'center',
+              justifyContent: 'center',
+              zIndex: 1100,
+              padding: '1rem',
+            }}
+          >
+            <div
+              style={{
+                background: 'var(--surface)',
+                borderRadius: '12px',
+                padding: '1.5rem',
+                maxWidth: '480px',
+                width: '100%',
+              }}
+            >
+              <h2 style={{ marginTop: 0 }}>Mitglied bearbeiten</h2>
+              <p style={{ color: 'var(--text2)', fontSize: '0.9rem' }}>
+                {editMemberModal.name || editMemberModal.email} (#{editMemberModal.profile_id})
+              </p>
+              <div className="form-row">
+                <label className="form-label">Status</label>
+                <select
+                  className="form-input"
+                  value={editMemberModal.status || 'active'}
+                  onChange={(e) =>
+                    setEditMemberModal((prev) => (prev ? { ...prev, status: e.target.value } : prev))
+                  }
+                >
+                  <option value="active">aktiv</option>
+                  <option value="inactive">inaktiv</option>
+                </select>
+              </div>
+              <div className="form-row">
+                <span className="form-label">Rollen</span>
+                <div style={{ display: 'flex', flexDirection: 'column', gap: '0.35rem' }}>
+                  {CLUB_ROLE_OPTIONS.map((opt) => (
+                    <label key={opt.code} style={{ display: 'flex', alignItems: 'center', gap: '0.35rem' }}>
+                      <input
+                        type="checkbox"
+                        checked={(editMemberModal.roles || []).includes(opt.code)}
+                        onChange={() => {
+                          setEditMemberModal((prev) => {
+                            if (!prev) return prev
+                            const set = new Set(prev.roles || [])
+                            if (set.has(opt.code)) set.delete(opt.code)
+                            else set.add(opt.code)
+                            let roles = Array.from(set)
+                            if (!roles.length) roles = ['trainer']
+                            return { ...prev, roles }
+                          })
+                        }}
+                      />
+                      {opt.label}
+                    </label>
+                  ))}
+                </div>
+              </div>
+              <div style={{ display: 'flex', flexDirection: 'column', gap: '0.5rem', marginTop: '1rem' }}>
+                <button
+                  type="button"
+                  className="btn btn-primary"
+                  onClick={async () => {
+                    try {
+                      await api.updateClubMember(membersAdminClubId, editMemberModal.profile_id, {
+                        roles: editMemberModal.roles,
+                        status: editMemberModal.status,
+                      })
+                      setEditMemberModal(null)
+                      await reloadMembersAdmin()
+                      await loadData()
+                    } catch (err) {
+                      alert(err.message || String(err))
+                    }
+                  }}
+                >
+                  Speichern
+                </button>
+                <button
+                  type="button"
+                  className="btn"
+                  style={{ background: 'var(--danger)', color: '#fff', border: 'none' }}
+                  onClick={async () => {
+                    if (
+                      !confirm(
+                        'Mitgliedschaft wirklich entfernen? (Nutzer verliert alle Rollen in diesem Verein.)'
+                      )
+                    )
+                      return
+                    try {
+                      await api.removeClubMember(membersAdminClubId, editMemberModal.profile_id)
+                      setEditMemberModal(null)
+                      await reloadMembersAdmin()
+                      await loadData()
+                    } catch (err) {
+                      alert(err.message || String(err))
+                    }
+                  }}
+                >
+                  Aus Verein entfernen
+                </button>
+                <button type="button" className="btn btn-secondary" onClick={() => setEditMemberModal(null)}>
+                  Schließen
+                </button>
+              </div>
+            </div>
+          </div>
+        )}
     </div>
   )
 }
diff --git a/frontend/src/pages/LoginPage.jsx b/frontend/src/pages/LoginPage.jsx
index c13dd81..59685a8 100644
--- a/frontend/src/pages/LoginPage.jsx
+++ b/frontend/src/pages/LoginPage.jsx
@@ -1,4 +1,4 @@
-import React, { useState } from 'react'
+import React, { useState, useEffect } from 'react'
 import { useNavigate } from 'react-router-dom'
 import { useAuth } from '../context/AuthContext'
 import api from '../utils/api'
@@ -11,11 +11,18 @@ function LoginPage() {
   const [error, setError] = useState('')
   const [loading, setLoading] = useState(false)
   const [success, setSuccess] = useState('')
+  const [publicClubs, setPublicClubs] = useState([])
+  const [requestedClubId, setRequestedClubId] = useState('')
   const [resending, setResending] = useState(false)
 
   const navigate = useNavigate()
   const { checkAuth } = useAuth()
 
+  useEffect(() => {
+    if (mode !== 'register') return
+    api.listPublicClubsDirectory().then(setPublicClubs).catch(() => setPublicClubs([]))
+  }, [mode])
+
   const handleSubmit = async (e) => {
     e.preventDefault()
     setError('')
@@ -29,10 +36,15 @@ function LoginPage() {
         await checkAuth()
         navigate('/')
       } else {
-        await api.register(email, password, name)
+        const extra =
+          requestedClubId !== ''
+            ? { requested_club_id: parseInt(requestedClubId, 10) }
+            : {}
+        await api.register(email, password, name, extra)
         setSuccess('Registrierung erfolgreich! Bitte prüfe deine E-Mails (auch Spam).')
         setMode('login')
         setPassword('')
+        setRequestedClubId('')
       }
     } catch (err) {
       setError(err.message || 'Ein Fehler ist aufgetreten')
@@ -84,6 +96,7 @@ function LoginPage() {
             onClick={() => {
               setMode('login')
               setError('')
+              setRequestedClubId('')
             }}
             style={{ flex: 1 }}
           >
@@ -104,6 +117,7 @@ function LoginPage() {
 
         <form onSubmit={handleSubmit}>
           {mode === 'register' && (
+            <>
             <div className="form-row">
               <label className="form-label">Name</label>
               <input
@@ -115,6 +129,26 @@ function LoginPage() {
                 placeholder="Dein Name"
               />
             </div>
+            <div className="form-row">
+              <label className="form-label">Verein (optional)</label>
+              <select
+                className="form-input"
+                value={requestedClubId}
+                onChange={(e) => setRequestedClubId(e.target.value)}
+              >
+                <option value="">Kein Antrag / später</option>
+                {publicClubs.map((c) => (
+                  <option key={c.id} value={String(c.id)}>
+                    {c.name}
+                    {c.abbreviation ? ` (${c.abbreviation})` : ''}
+                  </option>
+                ))}
+              </select>
+              <p style={{ fontSize: '0.72rem', color: 'var(--text3)', marginTop: '0.35rem', lineHeight: 1.4 }}>
+                Nach der E-Mail-Bestätigung kann der Vereinsadmin deinen Beitritt freigeben.
+              </p>
+            </div>
+            </>
           )}
 
           <div className="form-row">
diff --git a/frontend/src/utils/api.js b/frontend/src/utils/api.js
index 279b8b6..149b97a 100644
--- a/frontend/src/utils/api.js
+++ b/frontend/src/utils/api.js
@@ -95,10 +95,10 @@ export async function login(email, password) {
   })
 }
 
-export async function register(email, password, name) {
+export async function register(email, password, name, extra = {}) {
   return request('/api/auth/register', {
     method: 'POST',
-    body: JSON.stringify({ email, password, name })
+    body: JSON.stringify({ email, password, name, ...extra }),
   })
 }
 
@@ -202,6 +202,51 @@ export async function removeClubMember(clubId, profileId) {
   return request(`/api/clubs/${clubId}/members/${profileId}`, { method: 'DELETE' })
 }
 
+/** Aktive Vereine (öffentlich, für Registrierungswahl). */
+export async function listPublicClubsDirectory() {
+  return request('/api/clubs/public-directory')
+}
+
+/** Vereinsinternes Mitgliederverzeichnis (Trainer-/Co-Auswahl). */
+export async function clubMembersDirectory(clubId) {
+  return request(`/api/clubs/${clubId}/members/directory`)
+}
+
+/** Eigene Beitrittsanträge. */
+export async function getMyClubJoinRequests() {
+  return request('/api/me/club-join-requests')
+}
+
+export async function createClubJoinRequest(payload) {
+  return request('/api/me/club-join-requests', {
+    method: 'POST',
+    body: JSON.stringify(payload),
+  })
+}
+
+export async function withdrawClubJoinRequest(requestId) {
+  return request(`/api/me/club-join-requests/${requestId}`, { method: 'DELETE' })
+}
+
+/** Offene Anträge (Vereins-/Plattform-Admin). */
+export async function listClubJoinRequests(clubId) {
+  return request(`/api/clubs/${clubId}/join-requests`)
+}
+
+export async function acceptClubJoinRequest(clubId, requestId, roles = ['trainer']) {
+  return request(`/api/clubs/${clubId}/join-requests/${requestId}/accept`, {
+    method: 'POST',
+    body: JSON.stringify({ roles }),
+  })
+}
+
+export async function rejectClubJoinRequest(clubId, requestId) {
+  return request(`/api/clubs/${clubId}/join-requests/${requestId}/reject`, {
+    method: 'POST',
+    body: JSON.stringify({}),
+  })
+}
+
 export async function listDivisions(clubId) {
   const query = clubId ? `?club_id=${clubId}` : ''
   return request(`/api/divisions${query}`)
@@ -1069,6 +1114,14 @@ export const api = {
   addClubMember,
   updateClubMember,
   removeClubMember,
+  listPublicClubsDirectory,
+  clubMembersDirectory,
+  getMyClubJoinRequests,
+  createClubJoinRequest,
+  withdrawClubJoinRequest,
+  listClubJoinRequests,
+  acceptClubJoinRequest,
+  rejectClubJoinRequest,
   listDivisions,
   createDivision,
   updateDivision,
diff --git a/frontend/src/version.js b/frontend/src/version.js
index f3a1220..f243c18 100644
--- a/frontend/src/version.js
+++ b/frontend/src/version.js
@@ -1,6 +1,6 @@
 // Shinkan Jinkendo Frontend Version
 
-export const APP_VERSION = "0.8.17"
+export const APP_VERSION = "0.8.18"
 export const BUILD_DATE = "2026-05-05"
 
 export const PAGE_VERSIONS = {