diff --git a/app/static/styles.css b/app/static/styles.css
index 5ecf7d9..2792960 100644
--- a/app/static/styles.css
+++ b/app/static/styles.css
@@ -240,6 +240,13 @@ input[type="radio"] { accent-color: var(--control-accent); }
 }
 [data-theme="dark"] .btn-secondary:hover { background: #1f2b3f; }
 
+/* Generic disabled button state */
+.btn:disabled {
+  opacity: 0.55;
+  cursor: not-allowed;
+  filter: grayscale(0.15);
+}
+
 .actions {
   margin-top: 16px;
   display: flex;
@@ -537,8 +544,8 @@ input[type="radio"] { accent-color: var(--control-accent); }
   top: 20px;
   right: 20px;
   background: var(--card-bg);
-  border: 1px solid hsl(142, 71%, 45%);
-  background-color: hsl(142, 82%, 30%);
+  border: 1px solid hsl(142, 82%, 30%);
+  background-color: hsl(142, 71%, 45%);
   border-radius: 12px;
   box-shadow: 0 10px 40px rgba(0,0,0,0.2);
   padding: 16px 20px;
diff --git a/app/templates/elsa_mono_form.html b/app/templates/elsa_mono_form.html
index 2b7b055..a147f55 100644
--- a/app/templates/elsa_mono_form.html
+++ b/app/templates/elsa_mono_form.html
@@ -103,13 +103,13 @@
 
                 <h2>Medien</h2>
                 <div class="media-controls">
-                    <button type="button" class="btn btn-secondary" onclick="addMediaType('monografie')">
+                    <button type="button" id="btn-monografie" class="btn btn-secondary" onclick="addMediaType('monografie')" title="Monografie Sektion hinzufügen">
                         <span class="mdi mdi-book"></span> + Monografie
                     </button>
-                    <button type="button" class="btn btn-secondary" onclick="addMediaType('zeitschriftenartikel')">
+                    <button type="button" id="btn-zeitschriftenartikel" class="btn btn-secondary" onclick="addMediaType('zeitschriftenartikel')" title="Zeitschriftenartikel Sektion hinzufügen">
                         <span class="mdi mdi-newspaper"></span> + Zeitschriftenartikel
                     </button>
-                    <button type="button" class="btn btn-secondary" onclick="addMediaType('herausgeberwerk')">
+                    <button type="button" id="btn-herausgeberwerk" class="btn btn-secondary" onclick="addMediaType('herausgeberwerk')" title="Herausgeberwerk Sektion hinzufügen">
                         <span class="mdi mdi-book-multiple"></span> + Herausgeberwerk
                     </button>
                 </div>
@@ -173,6 +173,9 @@
 
         // Media management functions (global scope for onclick handlers)
         function addMediaType(type) {
+            const btn = document.getElementById('btn-' + type);
+            // Prevent duplicate sections of same type
+            if (btn && btn.disabled) { return; }
             const container = document.getElementById('media-sections');
             const sectionId = 'section-' + sectionCounter++;
             
@@ -243,6 +246,11 @@
                 '</button>';
             
             container.appendChild(section);
+            // Disable button for this type until section removed
+            if (btn) {
+                btn.disabled = true;
+                btn.title = 'Sektion bereits hinzugefügt – entfernen zum erneuten Hinzufügen';
+            }
             
             // Add first row automatically
             addMediaRow(sectionId, type);
@@ -314,6 +322,7 @@
             const section = document.getElementById(sectionId);
             if (section) {
                 if (confirm('Möchten Sie diese Sektion wirklich entfernen?')) {
+                    const type = section.getAttribute('data-type');
                     // Clean up tracking for removed rows
                     const rows = section.querySelectorAll('tr[id]');
                     rows.forEach(row => {
@@ -323,6 +332,12 @@
                         }
                     });
                     section.remove();
+                    // Re-enable button for this media type
+                    const btn = document.getElementById('btn-' + type);
+                    if (btn) {
+                        btn.disabled = false;
+                        btn.title = 'Sektion hinzufügen';
+                    }
                     updateSubmitButton();
                 }
             }