diff --git a/App/pages/_partials/country_footer.php b/App/pages/_partials/country_footer.php
new file mode 100644
index 0000000..51a91a9
--- /dev/null
+++ b/App/pages/_partials/country_footer.php
@@ -0,0 +1,38 @@
+<?php
+/**
+ * Country-Footer — „Andere Länder: 🇨🇭 / 🇩🇪 / 🇱🇮"
+ * --------------------------------------------------
+ * Kleine Zeile unten in den öffentlichen Seiten. Zeigt die jeweils
+ * *nicht* aktuell gewählten Länder mit Flaggen-Link.
+ */
+require_once __DIR__ . '/../../php/lib/Country.php';
+
+$current = Country::current();
+$others = array_filter(Country::allCountries(), fn($c) => $c !== $current);
+?>
+<div class="md-country-foot">
+  Andere Länder:
+  <?php foreach ($others as $c): ?>
+    <a href="?country=<?= htmlspecialchars($c) ?>"
+       onclick="event.preventDefault(); window.__GGS_setCountry('<?= htmlspecialchars($c) ?>');"
+       class="md-country-foot-link"
+       title="<?= htmlspecialchars(Country::label($c)) ?>">
+      <?= Country::flag($c) ?> <?= htmlspecialchars(Country::label($c)) ?>
+    </a>
+  <?php endforeach; ?>
+</div>
+
+<style>
+  .md-country-foot {
+    font-size: .78rem; color: var(--ggs-text-muted);
+    padding: .6rem 0 0;
+    text-align: center;
+  }
+  .md-country-foot a {
+    display: inline-block; margin: 0 .3rem; padding: .3rem .5rem;
+    color: var(--ggs-fjord); text-decoration: none;
+    border-radius: var(--ggs-radius-sm);
+    min-height: 32px;
+  }
+  .md-country-foot a:hover { background: var(--ggs-fjord-light); }
+</style>
diff --git a/App/pages/_partials/country_picker.php b/App/pages/_partials/country_picker.php
new file mode 100644
index 0000000..8e4a3dd
--- /dev/null
+++ b/App/pages/_partials/country_picker.php
@@ -0,0 +1,93 @@
+<?php
+/**
+ * Country-Picker — Native <select> im Header
+ * -------------------------------------------
+ * Wird per include in den Modul-/Lehrplan-/Simulationen-Seiten eingebunden.
+ *
+ * Erwartet im eltern-Scope:
+ *   $bp         BASE_PATH
+ *
+ * Beim Ändern:
+ *   - POST auf /php/api/country.php (Session + Cookie)
+ *   - Fallback: Cookie via JS
+ *   - Seite wird neu geladen, damit alle Server-seitigen Filter greifen
+ */
+
+require_once __DIR__ . '/../../php/lib/Country.php';
+
+if (!isset($bp)) $bp = defined('BASE_PATH') ? BASE_PATH : '';
+$currentCountry = Country::current();
+?>
+<form class="md-country-form" method="post" action="#" onsubmit="return false;" aria-label="Land auswählen">
+  <label for="md-country-select" class="md-country-label">
+    <?= Country::flag($currentCountry) ?>
+  </label>
+  <select id="md-country-select" class="md-country-select"
+          onchange="window.__GGS_setCountry(this.value)">
+    <?php foreach (Country::allCountries() as $code): ?>
+      <option value="<?= htmlspecialchars($code) ?>"
+              <?= $code === $currentCountry ? 'selected' : '' ?>>
+        <?= Country::flag($code) ?> <?= Country::label($code) ?>
+      </option>
+    <?php endforeach; ?>
+  </select>
+</form>
+
+<style>
+  /* Native-Select iPad-freundlich gestylt */
+  .md-country-form {
+    display: inline-flex; align-items: center; gap: .3rem;
+    background: var(--ggs-white); border: 1px solid var(--ggs-border);
+    border-radius: var(--ggs-radius-sm);
+    padding: 0 .5rem 0 .75rem; min-height: 40px;
+  }
+  .md-country-form:hover, .md-country-form:focus-within {
+    border-color: var(--ggs-fjord);
+  }
+  .md-country-label {
+    font-size: 1.1rem; line-height: 1; pointer-events: none;
+  }
+  .md-country-select {
+    appearance: auto;               /* native Wheel-Picker auf iOS */
+    -webkit-appearance: auto;
+    background: transparent; border: 0; cursor: pointer;
+    font-size: .85rem; font-weight: 600; font-family: inherit;
+    color: var(--ggs-fjord-dark);
+    padding: .5rem .2rem; min-height: 40px;
+  }
+  .md-country-select:focus { outline: none; }
+</style>
+
+<script>
+/*
+ * window.__GGS_setCountry(code)
+ *
+ * 1. POST an /php/api/country.php (falls verfügbar) — persistiert Session + Cookie.
+ * 2. Zusätzlich lokalen Cookie setzen (Fallback, wenn API-Call scheitert).
+ * 3. Seite reloaden, damit Server-Filter greifen (Lehrplan-Default etc.).
+ */
+if (typeof window.__GGS_setCountry !== 'function') {
+  window.__GGS_setCountry = function (code) {
+    try {
+      // Local Cookie als sofortiger Fallback (1 Jahr)
+      document.cookie = 'ggs-country=' + encodeURIComponent(code)
+        + '; Max-Age=' + (60*60*24*365)
+        + '; Path=<?= $bp ?: "/" ?>; SameSite=Lax';
+    } catch (e) {}
+    // Server-Speicherung
+    fetch('<?= $bp ?>/api/country', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ country: code })
+    }).catch(function () {
+      // Netz weg, kein Problem — Cookie reicht als Fallback
+    }).finally(function () {
+      // Seite neu laden, damit Server-Filter (z.B. lehrplan.php ?country=...) greifen
+      // Wenn in URL bereits ?country=... steht, diesen Parameter überschreiben
+      var u = new URL(window.location.href);
+      u.searchParams.set('country', code);
+      window.location.href = u.toString();
+    });
+  };
+}
+</script>
diff --git a/App/pages/_partials/modul_detail.php b/App/pages/_partials/modul_detail.php
index e6fffda..d128a03 100644
--- a/App/pages/_partials/modul_detail.php
+++ b/App/pages/_partials/modul_detail.php
@@ -404,6 +404,7 @@ $countryMeta = [
   <?php if ($easyActive): ?>
     <span class="md-btn-sm md-easy-pill" title="Leichte Sprache ist aktiv">🟢 Leichte Sprache</span>
   <?php endif; ?>
+  <?php include __DIR__ . '/country_picker.php'; ?>
   <a href="<?= $bp ?>/pages/simulationen.php" class="md-btn-sm">Alle Simulationen</a>
   <a href="<?= $bp ?>/pages/lehrplan.php" class="md-btn-sm">Lehrplan</a>
   <a href="<?= $bp ?>/glossar" class="md-btn-sm">Glossar</a>
@@ -631,6 +632,7 @@ $countryMeta = [
     <a href="<?= $bp ?>/impressum.html">Impressum</a> ·
     <a href="<?= $bp ?>/datenschutz.html">Datenschutz</a>
   </div>
+  <?php include __DIR__ . '/country_footer.php'; ?>
 </footer>
 
 <script>
diff --git a/App/pages/lehrplan.php b/App/pages/lehrplan.php
index 13d4fe4..301b3c8 100644
--- a/App/pages/lehrplan.php
+++ b/App/pages/lehrplan.php
@@ -15,14 +15,19 @@
 require_once __DIR__ . '/../php/config/app.php';
 require_once __DIR__ . '/../php/config/db.php';
 require_once __DIR__ . '/../php/lib/EasyLang.php';
+require_once __DIR__ . '/../php/lib/Country.php';
 
 $db = getDB();
 
-// Filter aus URL (sanft, nur Whitelist-Werte)
+// Filter: Default ist das aktuelle Landes-Setting (Kaskade), per URL überschreibbar
 $allowedCountries = ['AT', 'DE', 'CH', 'LI'];
-$qCountry = strtoupper(trim($_GET['country'] ?? 'AT'));
-if (!in_array($qCountry, $allowedCountries, true) && $qCountry !== 'ALL') {
-    $qCountry = 'AT';   // Default
+if (isset($_GET['country'])) {
+    $qCountry = strtoupper(trim($_GET['country']));
+    if (!in_array($qCountry, $allowedCountries, true) && $qCountry !== 'ALL') {
+        $qCountry = Country::current();
+    }
+} else {
+    $qCountry = Country::current();
 }
 
 $qTheme  = preg_replace('/[^a-z0-9_-]/', '', strtolower($_GET['theme'] ?? ''));
@@ -359,6 +364,7 @@ $categoryMeta = [
   <?php if ($easyActive): ?>
     <span class="lp-btn-sm lp-easy-pill">🟢 Leichte Sprache</span>
   <?php endif; ?>
+  <?php include __DIR__ . '/_partials/country_picker.php'; ?>
   <a href="<?= $bp ?>/pages/simulationen.php" class="lp-btn-sm">Simulationen</a>
   <a href="<?= $bp ?>/glossar" class="lp-btn-sm">Glossar</a>
   <a href="<?= $bp ?>/login.html" class="lp-btn-sm lp-btn-primary">Anmelden</a>
@@ -557,6 +563,7 @@ $categoryMeta = [
     <a href="<?= $bp ?>/impressum.html">Impressum</a> ·
     <a href="<?= $bp ?>/datenschutz.html">Datenschutz</a>
   </div>
+  <?php include __DIR__ . '/_partials/country_footer.php'; ?>
 </footer>
 
 <script>
diff --git a/App/pages/simulationen.php b/App/pages/simulationen.php
index 591b163..ca01357 100644
--- a/App/pages/simulationen.php
+++ b/App/pages/simulationen.php
@@ -13,6 +13,7 @@
 require_once __DIR__ . '/../php/config/app.php';
 require_once __DIR__ . '/../php/config/db.php';
 require_once __DIR__ . '/../php/lib/EasyLang.php';
+require_once __DIR__ . '/../php/lib/Country.php';
 
 $db = getDB();
 
@@ -270,6 +271,7 @@ $statusMeta = [
   <?php if ($easyActive): ?>
     <span class="sp-btn-sm sp-easy-pill">🟢 Leichte Sprache</span>
   <?php endif; ?>
+  <?php include __DIR__ . '/_partials/country_picker.php'; ?>
   <a href="<?= $bp ?>/pages/lehrplan.php" class="sp-btn-sm">Lehrplan</a>
   <a href="<?= $bp ?>/glossar" class="sp-btn-sm">Glossar</a>
   <a href="<?= $bp ?>/login.html" class="sp-btn-sm sp-btn-primary">Anmelden</a>
@@ -400,6 +402,7 @@ $statusMeta = [
     <a href="<?= $bp ?>/impressum.html">Impressum</a> ·
     <a href="<?= $bp ?>/datenschutz.html">Datenschutz</a>
   </div>
+  <?php include __DIR__ . '/_partials/country_footer.php'; ?>
 </footer>
 
 <script>
diff --git a/App/php/api/country.php b/App/php/api/country.php
new file mode 100644
index 0000000..973e485
--- /dev/null
+++ b/App/php/api/country.php
@@ -0,0 +1,52 @@
+<?php
+/**
+ * Country API
+ * -----------
+ * GET  /api/country           → aktuelles Land JSON { country: "AT" }
+ * POST /api/country           → setzt das aktuelle Land
+ *                                Body: { "country": "DE" }
+ *                                Persistiert in Session + Cookie.
+ *
+ * Absichtlich leicht gehalten: Die DB-Felder (teachers/classes/students)
+ * werden *nicht* von dieser API geschrieben — das bleibt dem Profil-Editor
+ * der Lehrperson und dem Admin überlassen. Hier nur der Kurzzeit-Override.
+ */
+
+require_once __DIR__ . '/../config/app.php';
+require_once __DIR__ . '/../lib/Country.php';
+
+header('Content-Type: application/json; charset=utf-8');
+
+$method = $_SERVER['REQUEST_METHOD'] ?? 'GET';
+
+if ($method === 'GET') {
+    echo json_encode([
+        'country' => Country::current(),
+        'flag'    => Country::flag(Country::current()),
+        'label'   => Country::label(Country::current()),
+    ], JSON_UNESCAPED_UNICODE);
+    exit;
+}
+
+if ($method === 'POST') {
+    $body = json_decode(file_get_contents('php://input') ?: '{}', true) ?: [];
+    $code = strtoupper((string)($body['country'] ?? $_POST['country'] ?? ''));
+
+    if (!Country::isValid($code)) {
+        http_response_code(400);
+        echo json_encode(['error' => 'Invalid country code. Expected AT, DE, CH or LI.']);
+        exit;
+    }
+
+    Country::setCurrent($code);
+    echo json_encode([
+        'country' => Country::current(),
+        'flag'    => Country::flag(Country::current()),
+        'label'   => Country::label(Country::current()),
+        'ok'      => true,
+    ], JSON_UNESCAPED_UNICODE);
+    exit;
+}
+
+http_response_code(405);
+echo json_encode(['error' => 'Method not allowed']);
diff --git a/App/php/lib/Country.php b/App/php/lib/Country.php
new file mode 100644
index 0000000..46b41e0
--- /dev/null
+++ b/App/php/lib/Country.php
@@ -0,0 +1,168 @@
+<?php
+/**
+ * Country — Landeinstellung (AT / DE / CH / LI)
+ * ---------------------------------------------
+ * Ermittelt das aktuelle Land für Rendering-Entscheidungen (Lehrplan-Filter,
+ * Inhalts-Priorisierung, Footer-Länderlinks). Auflösungs-Kaskade:
+ *
+ *   1. Explizites `?country=AT` in der URL            (höchste Priorität, zum Testen)
+ *   2. Session-Override (über setCurrent() gesetzt)
+ *   3. `student_sessions.country`                     (Schüler:in aktiv)
+ *   4. `classes.country`                              (von Klasse erben)
+ *   5. `teachers.country`                             (Lehrperson eingeloggt)
+ *   6. Cookie `ggs-country` (Client-Setting für Gast)
+ *   7. 'AT' Default
+ *
+ * Beispiel:
+ *   $country = Country::current();           // 'AT'
+ *   echo Country::flag('DE');                // 🇩🇪
+ *   echo Country::label('CH');               // Schweiz
+ *   foreach (Country::allCountries() as $c)  ...
+ */
+
+require_once __DIR__ . '/../config/db.php';
+
+class Country
+{
+    public const DEFAULT = 'AT';
+
+    private static ?string $cached = null;
+
+    private const META = [
+        'AT' => ['label' => 'Österreich',   'flag' => '🇦🇹'],
+        'DE' => ['label' => 'Deutschland',  'flag' => '🇩🇪'],
+        'CH' => ['label' => 'Schweiz',      'flag' => '🇨🇭'],
+        'LI' => ['label' => 'Liechtenstein','flag' => '🇱🇮'],
+    ];
+
+    public static function allCountries(): array
+    {
+        return array_keys(self::META);
+    }
+
+    public static function isValid(?string $code): bool
+    {
+        return is_string($code) && isset(self::META[strtoupper($code)]);
+    }
+
+    public static function flag(string $code): string
+    {
+        return self::META[strtoupper($code)]['flag'] ?? '🏳️';
+    }
+
+    public static function label(string $code): string
+    {
+        return self::META[strtoupper($code)]['label'] ?? $code;
+    }
+
+    /**
+     * Liefert das aktuell gültige Land nach der Kaskade.
+     * Cached pro Request.
+     */
+    public static function current(): string
+    {
+        if (self::$cached !== null) return self::$cached;
+
+        // 1. URL-Override (?country=AT)
+        if (!empty($_GET['country']) && self::isValid($_GET['country'])) {
+            return self::$cached = strtoupper($_GET['country']);
+        }
+
+        if (session_status() === PHP_SESSION_NONE) @session_start();
+
+        // 2. Session-Override (gezielt gesetzt, hält während Session)
+        if (!empty($_SESSION['ggs_country']) && self::isValid($_SESSION['ggs_country'])) {
+            return self::$cached = strtoupper($_SESSION['ggs_country']);
+        }
+
+        // 3-5. DB-Kaskade
+        try {
+            $db = getDB();
+
+            // 3. Schüler:in aktiv?
+            $studentId = $_SESSION['student_id'] ?? null;
+            if ($studentId) {
+                $row = self::fetchFirst($db, '
+                    SELECT s.country AS s_country,
+                           c.country AS c_country,
+                           t.country AS t_country
+                    FROM students s
+                    LEFT JOIN classes c ON c.id = s.class_id
+                    LEFT JOIN teachers t ON t.id = c.teacher_id
+                    WHERE s.id = ? AND s.deleted_at IS NULL
+                    LIMIT 1
+                ', [$studentId]);
+                if ($row) {
+                    foreach (['s_country','c_country','t_country'] as $f) {
+                        if (!empty($row[$f]) && self::isValid($row[$f])) {
+                            return self::$cached = strtoupper($row[$f]);
+                        }
+                    }
+                }
+            }
+
+            // 4./5. Lehrperson eingeloggt?
+            $teacherId = $_SESSION['teacher_id'] ?? null;
+            if ($teacherId) {
+                $val = self::fetchFirst($db,
+                    'SELECT country FROM teachers WHERE id = ? LIMIT 1',
+                    [$teacherId]
+                );
+                if ($val && !empty($val['country']) && self::isValid($val['country'])) {
+                    return self::$cached = strtoupper($val['country']);
+                }
+            }
+        } catch (Throwable $e) {
+            // DB-Fehler → Cookie/Default weiter probieren
+        }
+
+        // 6. Cookie (Gast-Setting)
+        if (!empty($_COOKIE['ggs-country']) && self::isValid($_COOKIE['ggs-country'])) {
+            return self::$cached = strtoupper($_COOKIE['ggs-country']);
+        }
+
+        // 7. Default
+        return self::$cached = self::DEFAULT;
+    }
+
+    /**
+     * Setzt das aktuelle Land. Persistiert:
+     *  - Eingeloggter Schüler → students_sessions.country? Nein, wir nehmen `students.country`?
+     *    Aktuell: Session-Speicher + Cookie, damit die Einstellung nicht sofort die
+     *    DB verändert. DB-Schreiben bewusst dem Admin/Profile überlassen.
+     *  - Für Lehrperson: dto.
+     *  - Gast: nur Cookie
+     *
+     * Setzt zusätzlich `$_SESSION['ggs_country']` und einen Cookie für 1 Jahr.
+     */
+    public static function setCurrent(string $code): bool
+    {
+        if (!self::isValid($code)) return false;
+        $code = strtoupper($code);
+
+        if (session_status() === PHP_SESSION_NONE) @session_start();
+        $_SESSION['ggs_country'] = $code;
+
+        // Cookie 1 Jahr, SameSite=Lax, Path=BASE_PATH
+        $path = defined('BASE_PATH') && BASE_PATH !== '' ? BASE_PATH : '/';
+        @setcookie('ggs-country', $code, [
+            'expires'  => time() + 60*60*24*365,
+            'path'     => $path,
+            'samesite' => 'Lax',
+            'secure'   => !empty($_SERVER['HTTPS']),
+            'httponly' => false,     // Client-JS darf es auch lesen (symmetrischer Fallback)
+        ]);
+
+        self::$cached = $code;
+        return true;
+    }
+
+    /** Nur Internes Helpergriff — fetch one Row */
+    private static function fetchFirst(PDO $db, string $sql, array $params): ?array
+    {
+        $stmt = $db->prepare($sql);
+        $stmt->execute($params);
+        $row = $stmt->fetch(PDO::FETCH_ASSOC);
+        return $row ?: null;
+    }
+}
diff --git a/App/php/seed_content_architecture.php b/App/php/seed_content_architecture.php
index c8360af..162ee64 100644
--- a/App/php/seed_content_architecture.php
+++ b/App/php/seed_content_architecture.php
@@ -23,6 +23,29 @@ $db = getDB();
 
 echo "=== Content-Architektur Seed ===\n";
 
+// ------------------------------------------------------------------
+// 0. Country-Spalten (Landeinstellung-Kaskade) idempotent ergaenzen
+// ------------------------------------------------------------------
+// Auflösung: students.country? (optional) → classes → teachers → Cookie → AT
+// Schreibend nutzt nur Profil-Admin; Lese-Resolver in App/php/lib/Country.php
+$countryTargets = [
+    'teachers'         => 'country CHAR(2) NULL DEFAULT NULL AFTER email',
+    'classes'          => 'country CHAR(2) NULL DEFAULT NULL',
+    'student_sessions' => 'country CHAR(2) NULL DEFAULT NULL',
+];
+foreach ($countryTargets as $tbl => $def) {
+    try {
+        $exists = $db->query("SHOW COLUMNS FROM `$tbl` LIKE 'country'")->fetch();
+        if (!$exists) {
+            $db->exec("ALTER TABLE `$tbl` ADD COLUMN $def");
+            echo "  $tbl: Spalte country ergaenzt\n";
+        }
+    } catch (Throwable $e) {
+        echo "  $tbl: Hinweis — " . $e->getMessage() . "\n";
+    }
+}
+
+
 // ------------------------------------------------------------------
 // 1. Tabellen
 // ------------------------------------------------------------------