diff --git a/.gitea/workflows/lint.yml b/.gitea/workflows/lint.yml
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--- /dev/null
+++ b/.gitea/workflows/lint.yml
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+name: Lint
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  lint-php:
+    name: PHP Syntax Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install PHP
+        run: |
+          apt-get update -qq && apt-get install -y -qq php-cli > /dev/null 2>&1
+
+      - name: PHP Lint
+        run: |
+          errors=0
+          while IFS= read -r file; do
+            if ! php -l "$file" > /dev/null 2>&1; then
+              echo "❌ Syntax error in $file"
+              php -l "$file"
+              errors=1
+            fi
+          done < <(find . -name "*.php" -not -path "./vendor/*")
+          if [ "$errors" -eq 1 ]; then
+            echo "::error::PHP lint check failed"
+            exit 1
+          fi
+          echo "✅ All PHP files pass syntax check"
+
+  lint-css:
+    name: CSS Lint (stylelint)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Node.js & stylelint
+        run: |
+          apt-get update -qq && apt-get install -y -qq npm nodejs > /dev/null 2>&1
+          npm install -g stylelint stylelint-config-standard stylelint-prettier > /dev/null 2>&1
+
+      - name: CSS Lint
+        run: |
+          npx stylelint "**/*.css" --config .stylelintrc.json --allow-empty-input
+          echo "✅ All CSS files pass lint"
+
+  lint-html:
+    name: HTML Lint (htmlhint)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Node.js & htmlhint
+        run: |
+          apt-get update -qq && apt-get install -y -qq npm nodejs > /dev/null 2>&1
+          npm install -g htmlhint > /dev/null 2>&1
+
+      - name: HTML Lint
+        run: |
+          npx htmlhint "**/*.html" --config .htmlhintrc
+          echo "✅ All HTML files pass lint"
diff --git a/bilder/favicon/apple-touch-icon.png b/bilder/favicon/apple-touch-icon.png
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diff --git a/bilder/favicon/favicon-16x16.png b/bilder/favicon/favicon-16x16.png
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diff --git a/bilder/favicon/favicon-32x32.png b/bilder/favicon/favicon-32x32.png
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diff --git a/bilder/favicon/site.webmanifest b/bilder/favicon/site.webmanifest
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+++ b/bilder/favicon/site.webmanifest
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+{
+  "name": "Haus Schleusingen",
+  "short_name": "HS",
+  "icons": [
+    { "src": "/bilder/favicon/favicon-32x32.png", "sizes": "32x32", "type": "image/png" },
+    { "src": "/bilder/favicon/favicon-16x16.png", "sizes": "16x16", "type": "image/png" }
+  ],
+  "theme_color": "#1c1917",
+  "background_color": "#fafaf9"
+}