updated conditional balance due color in invoice print format

ns_app/print_formats/print_formats/sales_invoice_ns.html

@@ -1,5 +1,5 @@
 <style>
-/* Reserve space in PRINT/PDF so table does not overlap window address */
+/* 💡 Reserve space in PRINT/PDF so table does not overlap window address */
 @media print {
   .window-address-space {
     padding-top: 1in;
@@ -131,9 +131,24 @@
       <p style="display:flex; justify-content:space-between;">
         <strong>Paid:</strong><span>{{ doc.total_advance }}</span>
       </p>
+      
+      {% set balance = doc.outstanding_amount or 0 %}
+
+      {% if balance == 0 %}
+        {% set balance_color = "#2e7d32" %}
+      {% elif balance > 0 %}
+        {% set balance_color = "#c62828" %}
+      {% else %}
+        {% set balance_color = "#ef6c00" %}
+      {% endif %}
+    
       <p style="display:flex; justify-content:space-between;">
-        <strong>Balance Due:</strong><span>{{ doc.outstanding_amount }}</span>
+        <strong style="color: {{ balance_color }} !important;">Balance Due:</strong>
+        <span style="color: {{ balance_color }} !important;">{{ balance }}</span>
       </p>
+
+
+
  </div>
 
 
@@ -149,6 +164,26 @@
   Thanks for your business.
     </p>
   </div>
+  
+  {% set balance = doc.outstanding_amount or 0 %}
 
 
+  {% if balance == 0 %}
+  <div style="text-align: center; margin-top: 35px;">
+      <div style="
+          margin-top: 35px;
+          text-align: center;
+          font-size: 28px;
+          font-weight: bold;
+          color: #2e7d32;
+          border: 3px solid #2e7d32;
+          display: inline-block;
+          padding: 10px 40px;
+          transform: rotate(-5deg);
+      ">
+        PAID
+      </div>
+  </div>      
+  {% endif %}
+
 </div>