diff --git a/index.php b/index.php
index 14c018d..3600807 100755
--- a/index.php
+++ b/index.php
@@ -23,7 +23,7 @@ function is_user_on_vacation($conn, $user_id, $meeting_date)
     return $found !== null;
 }
 
-// 🔹 Funktion: Automatisch ablehnen, wenn im Urlaub (außer bei expliziter Zusage)
+// 🔹 Funktion: Automatisch ablehnen, wenn im Urlaub
 function auto_decline_if_on_vacation($conn, $meeting_id, $user_id, $meeting_date)
 {
     if (!is_user_on_vacation($conn, $user_id, $meeting_date)) {
@@ -39,12 +39,10 @@ function auto_decline_if_on_vacation($conn, $meeting_id, $user_id, $meeting_date
 
     $current_status = $existing ? $existing['rsvp_status'] : null;
 
-    // Wenn explizit "accepted" oder "maybe" gewählt wurde → NICHT überschreiben!
     if ($current_status === 'accepted' || $current_status === 'maybe') {
         return $current_status;
     }
 
-    // Nur wenn Status "declined" oder NULL → auf "declined" setzen
     if ($existing) {
         $upd = mysqli_prepare($conn, "UPDATE meeting_teilnehmer SET rsvp_status = 'declined', attended = 0 WHERE meeting_id = ? AND user_id = ?");
         mysqli_stmt_bind_param($upd, "ii", $meeting_id, $user_id);
@@ -181,36 +179,66 @@ if ($row) {
         mysqli_stmt_close($attendees_stmt);
     }
 
-    // --- ZAHLENDE PERSON BESTIMMEN ---
+    // --- ZAHLENDE PERSON BESTIMMEN (MIT GEBURTSTAGS-REGEL) ---
     $next_payer_username = null;
     if ($total_accepted > 0) {
-        $sql_next_payer = "
+        $current_year = date('Y');
+        $meeting_date = $row['meeting_date'];
+
+        // Kandidaten holen
+        $sql_candidates = "
             SELECT 
+                u.id,
                 u.username,
+                u.birthday,
+                u.last_birthday_year,
                 (SELECT COUNT(*) FROM meeting_teilnehmer WHERE user_id = u.id AND paid = 1) AS paid_count
             FROM meeting_teilnehmer mt
             JOIN users u ON mt.user_id = u.id
             WHERE mt.meeting_id = ? AND mt.rsvp_status = 'accepted'
-            ORDER BY paid_count ASC
+            ORDER BY u.username
         ";
-        $stmt_next_payer = mysqli_prepare($conn, $sql_next_payer);
-        mysqli_stmt_bind_param($stmt_next_payer, "i", $meeting_id);
-        mysqli_stmt_execute($stmt_next_payer);
-        $result_next_payer = mysqli_stmt_get_result($stmt_next_payer);
-        $payer_candidates = [];
-        $min_paid_count = -1;
-        while ($row_payer = mysqli_fetch_assoc($result_next_payer)) {
-            if ($min_paid_count == -1 || $row_payer['paid_count'] < $min_paid_count) {
-                $min_paid_count = $row_payer['paid_count'];
-                $payer_candidates = [$row_payer['username']];
-            } elseif ($row_payer['paid_count'] == $min_paid_count) {
-                $payer_candidates[] = $row_payer['username'];
+
+        $stmt_candidates = mysqli_prepare($conn, $sql_candidates);
+        mysqli_stmt_bind_param($stmt_candidates, "i", $meeting_id);
+        mysqli_stmt_execute($stmt_candidates);
+        $candidates = mysqli_fetch_all(mysqli_stmt_get_result($stmt_candidates), MYSQLI_ASSOC);
+        mysqli_stmt_close($stmt_candidates);
+
+        $birthday_payers = [];
+        $regular_payers = [];
+
+        foreach ($candidates as $c) {
+            if (empty($c['birthday'])) {
+                $regular_payers[] = $c;
+                continue;
+            }
+
+            $birth_month = (int)date('m', strtotime($c['birthday']));
+            $birth_day = (int)date('d', strtotime($c['birthday']));
+            $birthday_this_year = "$current_year-$birth_month-$birth_day";
+
+            $already_paid_this_year = ($c['last_birthday_year'] == $current_year);
+            $birthday_passed = (strtotime($birthday_this_year) <= strtotime($meeting_date));
+
+            if (!$already_paid_this_year && $birthday_passed) {
+                $birthday_payers[] = $c;
+            } else {
+                $regular_payers[] = $c;
             }
         }
-        mysqli_stmt_close($stmt_next_payer);
-        if (!empty($payer_candidates)) {
-            sort($payer_candidates);
-            $next_payer_username = $payer_candidates[0];
+
+        // Priorität: Geburtstagskinder zuerst
+        if (!empty($birthday_payers)) {
+            usort($birthday_payers, function ($a, $b) {
+                return $a['paid_count'] <=> $b['paid_count'];
+            });
+            $next_payer_username = $birthday_payers[0]['username'];
+        } elseif (!empty($regular_payers)) {
+            usort($regular_payers, function ($a, $b) {
+                return $a['paid_count'] <=> $b['paid_count'];
+            });
+            $next_payer_username = $regular_payers[0]['username'];
         }
     }
 
@@ -283,7 +311,6 @@ $german_weekdays = [
                 <p class="text-muted">nächster Termin:</p>
                 <p class="text-muted h3 fw-bold mb-2"><?= $german_weekday . ' ' . date('d.m.Y H:i', strtotime($row['meeting_date'])) ?></p>
                 <?php
-                // Prüfen, ob der aktuelle Benutzer bereits einen aktiven Vorschlag hat
                 $has_active_proposal = false;
                 if ($row) {
                     $check_proposal = mysqli_prepare($conn, "
@@ -332,9 +359,7 @@ $german_weekdays = [
                 </div>
             </div>
 
-            <!-- TODO: Fehler, wenn Kommentar weggelassen wird-->
-            <div class="d-flex justify-content-center pt-2 pb-3" style="max-width: 500px; margin-left: auto; margin-right: auto; flex-direction: column; align-items: center;" <!-- inline-css-ok -->
-
+            <div class="d-flex justify-content-center pt-2 pb-3" style="max-width: 500px; margin-left: auto; margin-right: auto; flex-direction: column; align-items: center;">
                 <?php if ($user_attendance_status === 'accepted'): ?>
                     <p class="text-success fw-bold mb-4">Du hast zugesagt!</p>
                     <div class="d-flex justify-content-center">
diff --git a/participant.php b/participant.php
index 2a06a65..6d42727 100755
--- a/participant.php
+++ b/participant.php
@@ -1,13 +1,8 @@
 <?php
-// Fehleranzeige für Entwicklung (optional)
-// error_reporting(E_ALL);
-// ini_set('display_errors', 1);
-
 include('inc/check_login.php');
 include('inc/db.php');
 require_once 'inc/helpers.php';
 
-// Meeting-ID prüfen
 if (!isset($_GET['id'])) {
     $_SESSION['error_message'] = "Keine Meeting-ID angegeben.";
     header("Location: index.php");
@@ -15,12 +10,9 @@ if (!isset($_GET['id'])) {
 }
 
 $meeting_id = intval($_GET['id']);
-
-// Quelle merken (für Weiterleitung)
 $source_page = isset($_GET['source']) && $_GET['source'] === 'history' ? 'history' : 'index';
 $cancel_link = $source_page === 'history' ? 'history.php' : 'index.php';
 
-// Meeting-Daten laden
 $stmt = mysqli_prepare($conn, "SELECT meeting_date, color_id, reason FROM meetings WHERE id = ?");
 mysqli_stmt_bind_param($stmt, "i", $meeting_id);
 mysqli_stmt_execute($stmt);
@@ -33,7 +25,6 @@ if (!$meeting) {
     exit;
 }
 
-// Farben und Benutzer laden
 $colors = [];
 $colors_result = mysqli_query($conn, "SELECT id, name FROM colors ORDER BY name");
 while ($row = mysqli_fetch_assoc($colors_result)) {
@@ -46,7 +37,6 @@ while ($row = mysqli_fetch_assoc($users_result)) {
     $users[] = $row;
 }
 
-// Bestehende Teilnehmerdaten laden
 $existing_feedback = [];
 $stmt = mysqli_prepare($conn, "SELECT user_id, attended, wore_color, paid FROM meeting_teilnehmer WHERE meeting_id = ?");
 mysqli_stmt_bind_param($stmt, "i", $meeting_id);
@@ -60,9 +50,7 @@ mysqli_stmt_close($stmt);
 $message = '';
 $message_type = '';
 
-// POST-Verarbeitung
 if ($_SERVER["REQUEST_METHOD"] === "POST") {
-    // Meeting-Daten aktualisieren (nur im History-Modus)
     if ($source_page === 'history') {
         $meeting_date = $_POST['meeting_date'] ?? '';
         $color_id = intval($_POST['color_id'] ?? 0);
@@ -97,7 +85,24 @@ if ($_SERVER["REQUEST_METHOD"] === "POST") {
         }
         mysqli_stmt_close($stmt_insert);
 
-        // Meeting als abgeschlossen markieren (nur im Index-Modus)
+        // 🔹 GEBURTSTAGS-REGEL: last_birthday_year setzen
+        foreach ($_POST['user_id'] as $user_id) {
+            $user_id = (int)$user_id;
+            $paid = isset($_POST['paid'][$user_id]) ? 1 : 0;
+
+            if ($paid) {
+                $stmt_bday = mysqli_prepare($conn, "
+                    UPDATE users 
+                    SET last_birthday_year = YEAR(CURDATE()) 
+                    WHERE id = ? AND birthday IS NOT NULL
+                ");
+                mysqli_stmt_bind_param($stmt_bday, "i", $user_id);
+                mysqli_stmt_execute($stmt_bday);
+                mysqli_stmt_close($stmt_bday);
+            }
+        }
+
+        // Meeting abschließen (nur im Index-Modus)
         if ($source_page === 'index') {
             $stmt_complete = mysqli_prepare($conn, "UPDATE meetings SET is_completed = 1 WHERE id = ?");
             mysqli_stmt_bind_param($stmt_complete, "i", $meeting_id);
@@ -112,7 +117,6 @@ if ($_SERVER["REQUEST_METHOD"] === "POST") {
         $message_type = 'warning';
     }
 
-    // 🔁 Zurück zur ursprünglichen Quelle
     header("Location: " . $cancel_link);
     exit;
 }