diff --git a/.gitignore b/.gitignore
index 57136dc..ac44341 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 bin/
 obj/
 out/
+build/
 
 # ── .NET ──────────────────────────────────────────────────────────────────────
 *.user
diff --git a/build-macos-app.sh b/build-macos-app.sh
new file mode 100755
index 0000000..972a6e7
--- /dev/null
+++ b/build-macos-app.sh
@@ -0,0 +1,123 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# ============================================================
+# build-macos-app.sh
+# Baut LehrerApp.Desktop als natives macOS .app-Bundle
+# ============================================================
+
+# ---- Konfiguration (bei Bedarf anpassen) --------------------
+PROJECT_PATH="LehrerApp.Desktop"          # Pfad zum .csproj / Projektordner
+APP_NAME="LehrerApp"                      # Name des App-Bundles (LehrerApp.app)
+EXECUTABLE_NAME="LehrerApp.Desktop"       # Name der Binary aus dotnet publish (= AssemblyName des Projekts!)
+BUNDLE_ID="de.deinname.lehrerapp"         # CFBundleIdentifier
+VERSION="1.0.0"                           # CFBundleShortVersionString
+MIN_MACOS="12.0"                          # LSMinimumSystemVersion
+ICON_PNG="icon.png"                       # Quell-Icon (min. 512x512 oder 1024x1024)
+RUNTIME_IDS=("osx-arm64" "osx-x64")       # Architekturen, für die gebaut wird
+UNIVERSAL_BUILD=true                      # true = zusätzlich Universal Binary via lipo
+CODESIGN_ADHOC=true                       # true = Ad-hoc-Signierung am Ende
+
+# ---- Ableitungen ---------------------------------------------
+BUILD_DIR="./build"
+APP_BUNDLE="${BUILD_DIR}/${APP_NAME}.app"
+CONTENTS_DIR="${APP_BUNDLE}/Contents"
+MACOS_DIR="${CONTENTS_DIR}/MacOS"
+RESOURCES_DIR="${CONTENTS_DIR}/Resources"
+
+echo "=== 1/6: Alte Build-Artefakte entfernen ==="
+rm -rf "${BUILD_DIR}"
+mkdir -p "${BUILD_DIR}"
+
+echo "=== 2/6: dotnet publish für jede Architektur ==="
+for RID in "${RUNTIME_IDS[@]}"; do
+  echo "  -> Publish für ${RID}"
+  dotnet publish "${PROJECT_PATH}" \
+    -c Release \
+    -r "${RID}" \
+    --self-contained true \
+    -p:PublishSingleFile=false \
+    -o "${BUILD_DIR}/publish/${RID}"
+done
+
+echo "=== 3/6: App-Bundle-Struktur anlegen ==="
+mkdir -p "${MACOS_DIR}" "${RESOURCES_DIR}"
+
+if [ "${UNIVERSAL_BUILD}" = true ] && [ "${#RUNTIME_IDS[@]}" -ge 2 ]; then
+  echo "  -> Universal Binary via lipo erzeugen"
+  SRC_A="${BUILD_DIR}/publish/${RUNTIME_IDS[0]}/${EXECUTABLE_NAME}"
+  SRC_B="${BUILD_DIR}/publish/${RUNTIME_IDS[1]}/${EXECUTABLE_NAME}"
+
+  # Alle Nicht-Binärdateien (Assets etc.) aus der ersten Architektur übernehmen
+  rsync -a --exclude "${EXECUTABLE_NAME}" "${BUILD_DIR}/publish/${RUNTIME_IDS[0]}/" "${MACOS_DIR}/"
+
+  lipo -create -output "${MACOS_DIR}/${EXECUTABLE_NAME}" "${SRC_A}" "${SRC_B}"
+else
+  echo "  -> Einzelne Architektur (${RUNTIME_IDS[0]}) übernehmen"
+  cp -r "${BUILD_DIR}/publish/${RUNTIME_IDS[0]}/"* "${MACOS_DIR}/"
+fi
+
+if [ ! -f "${MACOS_DIR}/${EXECUTABLE_NAME}" ]; then
+  echo "FEHLER: Erwartete Executable '${EXECUTABLE_NAME}' nicht in ${MACOS_DIR} gefunden."
+  echo "Tatsächlicher Inhalt von ${BUILD_DIR}/publish/${RUNTIME_IDS[0]}/:"
+  ls "${BUILD_DIR}/publish/${RUNTIME_IDS[0]}/"
+  echo "-> Passe EXECUTABLE_NAME im Skript-Kopf entsprechend an."
+  exit 1
+fi
+
+chmod +x "${MACOS_DIR}/${EXECUTABLE_NAME}"
+
+echo "=== 4/6: Icon konvertieren (.icns) ==="
+if [ -f "${ICON_PNG}" ]; then
+  ICONSET_DIR="${BUILD_DIR}/icon.iconset"
+  mkdir -p "${ICONSET_DIR}"
+
+  sips -z 16 16     "${ICON_PNG}" --out "${ICONSET_DIR}/icon_16x16.png"      > /dev/null
+  sips -z 32 32     "${ICON_PNG}" --out "${ICONSET_DIR}/icon_16x16@2x.png"   > /dev/null
+  sips -z 32 32     "${ICON_PNG}" --out "${ICONSET_DIR}/icon_32x32.png"      > /dev/null
+  sips -z 64 64     "${ICON_PNG}" --out "${ICONSET_DIR}/icon_32x32@2x.png"   > /dev/null
+  sips -z 128 128   "${ICON_PNG}" --out "${ICONSET_DIR}/icon_128x128.png"    > /dev/null
+  sips -z 256 256   "${ICON_PNG}" --out "${ICONSET_DIR}/icon_128x128@2x.png" > /dev/null
+  sips -z 256 256   "${ICON_PNG}" --out "${ICONSET_DIR}/icon_256x256.png"    > /dev/null
+  sips -z 512 512   "${ICON_PNG}" --out "${ICONSET_DIR}/icon_256x256@2x.png" > /dev/null
+  sips -z 512 512   "${ICON_PNG}" --out "${ICONSET_DIR}/icon_512x512.png"    > /dev/null
+  sips -z 1024 1024 "${ICON_PNG}" --out "${ICONSET_DIR}/icon_512x512@2x.png" > /dev/null
+
+  iconutil -c icns "${ICONSET_DIR}" -o "${RESOURCES_DIR}/icon.icns"
+  ICON_KEY="<key>CFBundleIconFile</key><string>icon.icns</string>"
+else
+  echo "  -> Kein '${ICON_PNG}' gefunden, App-Bundle wird ohne Icon erstellt."
+  ICON_KEY=""
+fi
+
+echo "=== 5/6: Info.plist schreiben ==="
+cat > "${CONTENTS_DIR}/Info.plist" <<PLIST
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>CFBundleName</key><string>${APP_NAME}</string>
+    <key>CFBundleDisplayName</key><string>${APP_NAME}</string>
+    <key>CFBundleExecutable</key><string>${EXECUTABLE_NAME}</string>
+    <key>CFBundleIdentifier</key><string>${BUNDLE_ID}</string>
+    <key>CFBundlePackageType</key><string>APPL</string>
+    <key>CFBundleShortVersionString</key><string>${VERSION}</string>
+    <key>CFBundleVersion</key><string>${VERSION}</string>
+    <key>LSMinimumSystemVersion</key><string>${MIN_MACOS}</string>
+    <key>NSHighResolutionCapable</key><true/>
+    ${ICON_KEY}
+</dict>
+</plist>
+PLIST
+
+echo "=== 6/6: Signieren ==="
+if [ "${CODESIGN_ADHOC}" = true ]; then
+  codesign --force --deep --sign - "${APP_BUNDLE}"
+  echo "  -> Ad-hoc signiert (nur lokal lauffähig, Gatekeeper-Warnung bei Weitergabe)."
+else
+  echo "  -> Signierung übersprungen."
+fi
+
+echo ""
+echo "Fertig! App-Bundle liegt unter: ${APP_BUNDLE}"
+echo "Test mit: open '${APP_BUNDLE}'"
\ No newline at end of file
diff --git a/icon.png b/icon.png
new file mode 100644
index 0000000..b4be217
Binary files /dev/null and b/icon.png differ