diff --git a/frontend/admin.html b/frontend/admin.html
index bc30746..f6f4952 100644
--- a/frontend/admin.html
+++ b/frontend/admin.html
@@ -61,19 +61,20 @@
         <div class="admin-bar">
             <h1>MC Cars · Admin</h1>
             <div style="display:flex;gap:0.6rem;align-items:center;flex-wrap:wrap;">
-                <a href="index.html" class="btn ghost small">Website</a>
+                <a href="index.html" class="btn ghost small" data-i18n="adminNavWebsite">Website</a>
+                <button class="lang-toggle" type="button" aria-label="Sprache wechseln" style="margin-left:auto;">EN</button>
 
-                <span id="adminWho" style="color:var(--muted);font-size:0.85rem;"></span>
-                <button id="changePwBtn" class="btn ghost small">Passwort aendern</button>
-                <button id="logoutBtn" class="btn small">Logout</button>
+                <span id="adminWho" style="color:var(--muted);font-size:0.85rem;margin-left:1rem;"></span>
+                <button id="changePwBtn" class="btn ghost small" data-i18n="adminChangePw">Passwort aendern</button>
+                <button id="logoutBtn" class="btn small" data-i18n="adminLogout">Logout</button>
             </div>
         </div>
 
         <!-- Tabs -->
         <div class="admin-tabs" role="tablist">
-            <button class="tab active" data-tab="leads"     role="tab">Leads <span id="leadsBadge" class="tab-badge">0</span></button>
-            <button class="tab"        data-tab="customers" role="tab">Kunden <span id="customersBadge" class="tab-badge">0</span></button>
-            <button class="tab"        data-tab="vehicles"  role="tab">Fahrzeuge</button>
+            <button class="tab active" data-tab="leads"     role="tab"><span data-i18n="adminLeads">Leads</span> <span id="leadsBadge" class="tab-badge">0</span></button>
+            <button class="tab"        data-tab="customers" role="tab"><span data-i18n="adminCustomers">Kunden</span> <span id="customersBadge" class="tab-badge">0</span></button>
+            <button class="tab"        data-tab="vehicles"  role="tab" data-i18n="adminVehicles">Fahrzeuge</button>
         </div>
 
         <!-- LEADS -->
@@ -82,18 +83,18 @@
                 <div style="display:flex;justify-content:space-between;align-items:center;gap:1rem;flex-wrap:wrap;margin-bottom:1rem;">
                     <h2 style="margin:0;">Leads</h2>
                     <div class="sub-tabs" role="tablist">
-                        <button class="sub-tab active" data-lview="active">Aktive Leads</button>
-                        <button class="sub-tab"        data-lview="inactive">Abgeschlossen</button>
+                        <button class="sub-tab active" data-lview="active" data-i18n="adminActiveLeads">Aktive Leads</button>
+                        <button class="sub-tab"        data-lview="inactive" data-i18n="adminClosedLeads">Abgeschlossen</button>
                     </div>
                 </div>
                 <table class="admin-table" id="leadsTable">
                     <thead>
                         <tr>
-                            <th>Eingang</th>
-                            <th>Name / E-Mail</th>
-                            <th>Fahrzeug</th>
-                            <th>Zeitraum</th>
-                            <th>Status</th>
+                            <th data-i18n="adminReceived">Eingang</th>
+                            <th data-i18n="adminNameEmail">Name / E-Mail</th>
+                            <th data-i18n="adminVehicleTab">Fahrzeug</th>
+                            <th data-i18n="adminPeriod">Zeitraum</th>
+                            <th data-i18n="adminStatus">Status</th>
                             <th></th>
                         </tr>
                     </thead>
@@ -111,11 +112,11 @@
                 <table class="admin-table" id="customersTable">
                     <thead>
                         <tr>
-                            <th>Erster Kontakt</th>
-                            <th>Name / E-Mail</th>
-                            <th>Telefon</th>
-                            <th>Quelle (Lead)</th>
-                            <th>Status</th>
+                            <th data-i18n="adminFirstContact">Erster Kontakt</th>
+                            <th data-i18n="adminNameEmail">Name / E-Mail</th>
+                            <th data-i18n="adminPhone">Telefon</th>
+                            <th data-i18n="adminSourceLead">Quelle (Lead)</th>
+                            <th data-i18n="adminStatus">Status</th>
                             <th></th>
                         </tr>
                     </thead>
@@ -129,73 +130,76 @@
         <div class="tab-panel" id="tab-vehicles" style="display:none;">
             <div class="admin-grid">
                 <div class="panel">
-                    <h2 id="formTitle">Neues Fahrzeug</h2>
+                    <h2 id="formTitle" data-i18n="adminNewVehicle">Neues Fahrzeug</h2>
                     <form class="admin-form" id="vehicleForm">
                         <input type="hidden" name="vid" />
 
                         <div class="admin-photo-preview" id="photoPreview"></div>
                         <label>
-                            <span>Foto hochladen (JPG/PNG/WebP, max 50 MB)</span>
+                            <span data-i18n="adminPhotoUpload">Foto hochladen (JPG/PNG/WebP, max 50 MB)</span>
                             <input type="file" id="photoInput" accept="image/*" />
                         </label>
                         <label>
-                            <span>Foto-URL (wird automatisch gesetzt nach Upload)</span>
+                            <span data-i18n="adminPhotoUrl">Foto-URL (wird automatisch gesetzt nach Upload)</span>
                             <input type="url" name="photo_url" placeholder="https://..." />
                         </label>
 
                         <div class="row2">
-                            <label><span>Marke</span><input name="brand" required /></label>
-                            <label><span>Modell</span><input name="model" required /></label>
+                            <label><span data-i18n="adminBrand">Marke</span><input name="brand" required /></label>
+                            <label><span data-i18n="adminModel">Modell</span><input name="model" required /></label>
                         </div>
 
                         <div class="row3">
-                            <label><span>PS</span><input type="number" name="power_hp" min="0" /></label>
-                            <label><span>Top-Speed km/h</span><input type="number" name="top_speed_kmh" min="0" /></label>
-                            <label><span>0-100</span><input name="acceleration" placeholder="3.2s" /></label>
+                            <label><span data-i18n="adminPower">PS</span><input type="number" name="power_hp" min="0" /></label>
+                            <label><span data-i18n="adminSpeed">Top-Speed km/h</span><input type="number" name="top_speed_kmh" min="0" /></label>
+                            <label><span data-i18n="adminAccel">0-100</span><input name="acceleration" placeholder="3.2s" /></label>
                         </div>
 
                         <div class="row3">
-                            <label><span>Sitze</span><input type="number" name="seats" min="1" value="2" /></label>
-                            <label><span>Preis / Tag (€)</span><input type="number" name="daily_price_eur" min="0" required /></label>
-                            <label><span>Reihenfolge</span><input type="number" name="sort_order" value="100" /></label>
+                            <label><span data-i18n="adminSeats">Sitze</span><input type="number" name="seats" min="1" value="2" /></label>
+                            <label><span data-i18n="adminPrice">Preis / Tag (€)</span><input type="number" name="daily_price_eur" min="0" required /></label>
+                            <label><span data-i18n="adminSort">Reihenfolge</span><input type="number" name="sort_order" value="100" /></label>
                         </div>
 
                         <label>
-                            <span>Standort</span>
+                            <span data-i18n="adminLocation">Standort</span>
                             <input name="location" value="Steiermark (TBD)" />
                         </label>
 
                         <label>
-                            <span>Beschreibung (Deutsch)</span>
+                            <span data-i18n="adminDescDe">Beschreibung (Deutsch)</span>
                             <textarea name="description_de" rows="3"></textarea>
                         </label>
                         <label>
-                            <span>Description (English)</span>
+                            <span data-i18n="adminDescEn">Description (English)</span>
                             <textarea name="description_en" rows="3"></textarea>
                         </label>
 
-                        <label style="flex-direction:row;align-items:center;gap:0.5rem;">
-                            <input type="checkbox" name="is_active" checked style="width:auto;" />
-                            <span>Aktiv / auf Website sichtbar</span>
+                        <label style="flex-direction:row;align-items:center;gap:0.8rem;margin-top:0.5rem;cursor:pointer;">
+                            <div class="toggle-switch">
+                                <input type="checkbox" name="is_active" id="isActiveCheck" checked />
+                                <span class="toggle-slider"></span>
+                            </div>
+                            <span data-i18n="adminActiveVisible" style="user-select:none;">Aktiv / auf Website sichtbar</span>
                         </label>
 
-                        <div style="display:flex;gap:0.5rem;">
-                            <button class="btn" type="submit" id="saveBtn">Speichern</button>
-                            <button class="btn ghost" type="button" id="resetBtn">Neu</button>
+                        <div style="display:flex;gap:0.5rem;margin-top:1rem;">
+                            <button class="btn" type="submit" id="saveBtn" data-i18n="adminSave">Speichern</button>
+                            <button class="btn ghost" type="button" id="resetBtn" data-i18n="adminReset">Neu</button>
                         </div>
                         <p class="form-feedback" id="formFeedback"></p>
                     </form>
                 </div>
 
                 <div class="panel">
-                    <h2>Alle Fahrzeuge</h2>
+                    <h2 data-i18n="adminAllVehicles">Alle Fahrzeuge</h2>
                     <table class="admin-table" id="adminTable">
                         <thead>
                             <tr>
-                                <th>Foto</th>
-                                <th>Marke / Modell</th>
-                                <th>€ / Tag</th>
-                                <th>Aktiv</th>
+                                <th data-i18n="adminPhoto">Foto</th>
+                                <th data-i18n="adminBrandTable">Marke / Modell</th>
+                                <th data-i18n="adminPriceTable">€ / Tag</th>
+                                <th data-i18n="adminActive">Aktiv</th>
                                 <th></th>
                             </tr>
                         </thead>
diff --git a/frontend/admin.js b/frontend/admin.js
index 6e6ef0d..1a81c6a 100644
--- a/frontend/admin.js
+++ b/frontend/admin.js
@@ -1,4 +1,5 @@
 import { createClient } from "https://esm.sh/@supabase/supabase-js@2.45.4";
+import { getLang, setLang, t, applyI18n } from "./i18n.js";
 
 const SUPA_URL = window.MCCARS_CONFIG?.SUPABASE_URL ?? "";
 const SUPA_KEY = window.MCCARS_CONFIG?.SUPABASE_ANON_KEY || "";
@@ -12,6 +13,7 @@ const supabase = createClient(SUPA_URL, SUPA_KEY, {
 // ----- DOM -----
 const loginView     = document.querySelector("#loginView");
 const adminView     = document.querySelector("#adminView");
+const langToggle    = document.querySelector(".lang-toggle");
 const rotateView    = document.querySelector("#rotateView");
 const loginForm     = document.querySelector("#loginForm");
 const loginError    = document.querySelector("#loginError");
@@ -59,6 +61,7 @@ const state = {
 // AUTH FLOW
 // =========================================================================
 async function bootstrap() {
+    applyI18n();
     const { data: { session } } = await supabase.auth.getSession();
     if (session) {
         // Always fetch fresh user from server so metadata (must_change_password) is current.
@@ -204,8 +207,8 @@ function renderVehicles() {
             <td>€ ${v.daily_price_eur}</td>
             <td>${v.is_active ? "✅" : "—"}</td>
             <td style="white-space:nowrap;">
-                <button class="btn small ghost" data-edit="${v.id}">Edit</button>
-                <button class="btn small danger" data-del="${v.id}">Del</button>
+                <button class="btn small ghost" data-edit="${v.id}">${t("editVehicle")}</button>
+                    <button class="btn small danger" data-del="${v.id}">${t("adminDel")}</button>
             </td>`;
         tableBody.appendChild(tr);
     }
@@ -352,12 +355,12 @@ function renderLeads() {
             <td>${esc(l.date_from || "—")} → ${esc(l.date_to || "—")}</td>
             <td><span class="pill pill-${esc(l.status)}">${esc(l.status)}</span></td>
             <td style="white-space:nowrap;">
-                <button class="btn small ghost"  data-open="${l.id}">Details</button>
+                <button class="btn small ghost"  data-open="${l.id}">${t("adminDetails")}</button>
                 ${wantActive ? `
-                    <button class="btn small"        data-qual="${l.id}">Qualifizieren</button>
-                    <button class="btn small danger" data-disq="${l.id}">Ablehnen</button>
+                    <button class="btn small"        data-qual="${l.id}">${t("adminQualify")}</button>
+                    <button class="btn small danger" data-disq="${l.id}">${t("adminReject")}</button>
                 ` : `
-                    <button class="btn small ghost"  data-reopen="${l.id}">Wieder oeffnen</button>
+                    <button class="btn small ghost"  data-reopen="${l.id}">${t("adminReopen")}</button>
                 `}
             </td>`;
         leadsTableBody.appendChild(tr);
@@ -385,9 +388,9 @@ function openLead(id) {
         </dl>
         <div style="display:flex;gap:0.5rem;justify-content:flex-end;margin-top:0.8rem;">
             ${l.is_active ? `
-                <button class="btn danger" id="dlgDisq">Ablehnen</button>
-                <button class="btn"        id="dlgQual">Qualifizieren</button>
-            ` : `<button class="btn ghost" id="dlgReopen">Wieder oeffnen</button>`}
+                <button class="btn danger" id="dlgDisq">${t("adminReject")}</button>
+                <button class="btn"        id="dlgQual">${t("adminQualify")}</button>
+            ` : `<button class="btn ghost" id="dlgReopen">${t("adminReopen")}</button>`}
         </div>`;
     leadDialog.showModal();
     const note = () => document.querySelector("#leadNote").value;
@@ -448,7 +451,7 @@ function renderCustomers() {
             <td><span class="pill pill-${esc(c.status)}">${esc(c.status)}</span></td>
             <td style="white-space:nowrap;">
                 <button class="btn small ghost" data-toggle="${c.id}" data-status="${c.status}">
-                    ${c.status === "active" ? "Inaktiv setzen" : "Aktiv setzen"}
+                    ${c.status === "active" ? t("adminSetInactive") : t("adminSetActive")}
                 </button>
             </td>`;
         customersTableBody.appendChild(tr);
@@ -493,4 +496,18 @@ function fmtDate(iso) {
     return d.toLocaleString("de-AT", { dateStyle: "short", timeStyle: "short" });
 }
 
+if (langToggle) {
+    langToggle.addEventListener("click", () => {
+        const current = getLang();
+        setLang(current === "de" ? "en" : "de");
+        langToggle.textContent = getLang() === "de" ? "EN" : "DE";
+        applyI18n();
+        // Re-render JS injected text correctly
+        if (state.vehicles) renderVehicles();
+        if (state.leads) renderLeads();
+        if (state.customers) renderCustomers();
+    });
+    langToggle.textContent = getLang() === "de" ? "EN" : "DE";
+}
+
 bootstrap();
diff --git a/frontend/i18n.js b/frontend/i18n.js
index afa159d..e0d8687 100644
--- a/frontend/i18n.js
+++ b/frontend/i18n.js
@@ -69,11 +69,57 @@ export const translations = {
         footerNav: "Navigation",
         imprint: "Impressum",
         privacy: "Datenschutz",
-        terms: "Mietbedingungen",
+        footerTerms: "Mietbedingungen",
         copyright: "Alle Rechte vorbehalten.",
 
         close: "Schliessen",
         editVehicle: "Fahrzeug bearbeiten",
+
+        adminNavWebsite: "Website",
+        adminChangePw: "Passwort aendern",
+        adminLogout: "Logout",
+        adminLeads: "Leads",
+        adminCustomers: "Kunden",
+        adminVehicles: "Fahrzeuge",
+        adminNewVehicle: "Neues Fahrzeug",
+        adminAllVehicles: "Alle Fahrzeuge",
+        adminPhotoUpload: "Foto hochladen (JPG/PNG/WebP, max 50 MB)",
+        adminPhotoUrl: "Foto-URL (wird automatisch gesetzt nach Upload)",
+        adminBrand: "Marke",
+        adminModel: "Modell",
+        adminPower: "PS",
+        adminSpeed: "Top-Speed km/h",
+        adminAccel: "0-100",
+        adminSeats: "Sitze",
+        adminPrice: "Preis / Tag (€)",
+        adminSort: "Reihenfolge",
+        adminLocation: "Standort",
+        adminDescDe: "Beschreibung (Deutsch)",
+        adminDescEn: "Description (English)",
+        adminActiveVisible: "Aktiv / auf Website sichtbar",
+        adminSave: "Speichern",
+        adminReset: "Neu",
+        adminPhoto: "Foto",
+        adminBrandTable: "Marke / Modell",
+        adminPriceTable: "€ / Tag",
+        adminActive: "Aktiv",
+        adminDel: "Löschen",
+        adminQualify: "Qualifizieren",
+        adminReject: "Ablehnen",
+        adminReopen: "Wieder öffnen",
+        adminDetails: "Details",
+        adminSetInactive: "Inaktiv setzen",
+        adminSetActive: "Aktiv setzen",
+        adminActiveLeads: "Aktive Leads",
+        adminClosedLeads: "Abgeschlossen",
+        adminSourceLead: "Quelle (Lead)",
+        adminFirstContact: "Erster Kontakt",
+        adminNameEmail: "Name / E-Mail",
+        adminPhone: "Telefon",
+        adminStatus: "Status",
+        adminReceived: "Eingang",
+        adminVehicleTab: "Fahrzeug",
+        adminPeriod: "Zeitraum",
     },
     en: {
         navCars: "Fleet",
@@ -144,11 +190,57 @@ export const translations = {
         footerNav: "Navigation",
         imprint: "Imprint",
         privacy: "Privacy",
-        terms: "Rental conditions",
+        footerTerms: "Rental conditions",
         copyright: "All rights reserved.",
 
         close: "Close",
         editVehicle: "Edit vehicle",
+
+        adminNavWebsite: "Website",
+        adminChangePw: "Change password",
+        adminLogout: "Logout",
+        adminLeads: "Leads",
+        adminCustomers: "Customers",
+        adminVehicles: "Vehicles",
+        adminNewVehicle: "New vehicle",
+        adminAllVehicles: "All vehicles",
+        adminPhotoUpload: "Upload photo (JPG/PNG/WebP, max 50 MB)",
+        adminPhotoUrl: "Photo URL (auto-set after upload)",
+        adminBrand: "Brand",
+        adminModel: "Model",
+        adminPower: "HP",
+        adminSpeed: "Top speed km/h",
+        adminAccel: "0-62",
+        adminSeats: "Seats",
+        adminPrice: "Price / day (€)",
+        adminSort: "Sort order",
+        adminLocation: "Location",
+        adminDescDe: "Description (German)",
+        adminDescEn: "Description (English)",
+        adminActiveVisible: "Active / visible on website",
+        adminSave: "Save",
+        adminReset: "New",
+        adminPhoto: "Photo",
+        adminBrandTable: "Brand / Model",
+        adminPriceTable: "€ / day",
+        adminActive: "Active",
+        adminDel: "Delete",
+        adminQualify: "Qualify",
+        adminReject: "Reject",
+        adminReopen: "Reopen",
+        adminDetails: "Details",
+        adminSetInactive: "Set inactive",
+        adminSetActive: "Set active",
+        adminActiveLeads: "Active leads",
+        adminClosedLeads: "Closed",
+        adminSourceLead: "Source (Lead)",
+        adminFirstContact: "First contact",
+        adminNameEmail: "Name / Email",
+        adminPhone: "Phone",
+        adminStatus: "Status",
+        adminReceived: "Received",
+        adminVehicleTab: "Vehicle",
+        adminPeriod: "Period",
     },
 };
 
diff --git a/frontend/styles.css b/frontend/styles.css
index edd6559..5ce9ad0 100644
--- a/frontend/styles.css
+++ b/frontend/styles.css
@@ -604,6 +604,49 @@ table.admin-table tbody tr:hover {
     filter: brightness(1.1);
 }
 
+/* ---------------- Forms / Toggle Switch ---------------- */
+.toggle-switch {
+    position: relative;
+    display: inline-block;
+    width: 44px;
+    height: 24px;
+    flex-shrink: 0;
+}
+.toggle-switch input {
+    opacity: 0;
+    width: 0;
+    height: 0;
+}
+.toggle-slider {
+    position: absolute;
+    cursor: pointer;
+    top: 0; left: 0; right: 0; bottom: 0;
+    background-color: var(--line);
+    transition: background-color 0.3s ease;
+    border-radius: 24px;
+}
+.toggle-slider:before {
+    position: absolute;
+    content: "";
+    height: 16px;
+    width: 16px;
+    left: 4px;
+    bottom: 4px;
+    background-color: var(--text);
+    transition: transform 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
+    border-radius: 50%;
+}
+input:checked + .toggle-slider {
+    background-color: var(--accent);
+}
+input:focus + .toggle-slider {
+    box-shadow: 0 0 0 2px var(--bg-card), 0 0 0 4px var(--accent);
+}
+input:checked + .toggle-slider:before {
+    transform: translateX(20px);
+    background-color: #111;
+}
+
 /* Admin tabs */
 .admin-tabs { 
     display: flex; gap: 0.4rem;