diff --git a/.gitea/workflows/lint.yml b/.gitea/workflows/lint.yml
new file mode 100644
index 0000000..af1fd53
--- /dev/null
+++ b/.gitea/workflows/lint.yml
@@ -0,0 +1,64 @@
+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/css/haus-schleusingen.css b/css/haus-schleusingen.css
index ccb748d..a4bab37 100644
--- a/css/haus-schleusingen.css
+++ b/css/haus-schleusingen.css
@@ -1216,7 +1216,7 @@ footer {
     gap: 0;
     z-index: 95;
     border-bottom: 1px solid var(--warm);
-    animation: slideDown 0.3s ease;
+    animation: slide-down 0.3s ease;
   }
 
   nav.mobile-open .nav-links a {
@@ -1239,11 +1239,12 @@ footer {
     background: transparent;
   }
 
-  @keyframes slideDown {
+  @keyframes slide-down {
     from {
       opacity: 0;
       transform: translateY(-10px);
     }
+
     to {
       opacity: 1;
       transform: translateY(0);
diff --git a/index.php b/index.php
index 816e158..c3539df 100644
--- a/index.php
+++ b/index.php
@@ -737,7 +737,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
           </div>
 <?php else: ?>
 <?php if (!empty($formErrors)): ?>
-          <div id="form-result" class="form-errors">
+          <div id="form-errors" class="form-errors">
             <ul>
 <?php foreach ($formErrors as $error): ?>
               <li><?= escapeContactValue($error) ?></li>