diff --git a/static/js/api.js b/static/js/api.js
index e665dff..3f47766 100644
--- a/static/js/api.js
+++ b/static/js/api.js
@@ -87,7 +87,32 @@ window.sendCommand = async function() {
   let payload = {};
 
   if (type === 'build') {
-    payload = { building_id: document.getElementById('building-select').value };
+    const building_id = document.getElementById('building-select').value;
+    const bData = town.build_data?.[building_id];
+    
+    // UI Validation logic
+    if (bData) {
+      const missingDeps = bData.missing_dependencies || {};
+      const missingKeys = Object.keys(missingDeps);
+      
+      // 1. Popup if dependencies are lacking
+      if (missingKeys.length > 0) {
+        let msg = '⚠ ΑΔΥΝΑΤΗ Η ΚΑΤΑΣΚΕΥΗ: Λείπουν προϋποθέσεις!\n\nΑπαιτείται:\n';
+        for (const k of missingKeys) {
+            msg += `- ${missingDeps[k].name} (Επίπεδο ${missingDeps[k].needed_level})\n`;
+        }
+        return alert(msg);
+      }
+      
+      // 2. Confirmation if resources are lacking
+      if (bData.enough_resources === false) {
+          if (!confirm('❌ Δεν έχετε αρκετούς πόρους!\n\nΘέλετε να προστεθεί στην ουρά αναμονής; Το σύστημα θα το χτίσει αυτόματα μόλις συγκεντρωθούν οι πόροι.')) {
+              return;
+          }
+      }
+    }
+    
+    payload = { building_id };
   } else {
     payload = {
       unit_id: document.getElementById('unit-select').value,
diff --git a/static/js/components/commandForm.js b/static/js/components/commandForm.js
index 3ba11ed..787379b 100644
--- a/static/js/components/commandForm.js
+++ b/static/js/components/commandForm.js
@@ -36,15 +36,16 @@ window.renderBuildingDropdown = function() {
       const popStr = pop > 0 ? ` 🧔:${pop} ` : ' ';
       const costStr = `Ξ:${w} Π:${st} Α:${i}${popStr}· ⏱ ${t}`;
 
-      // Figure out the state
-      const isLocked = (!data.dependencies) || (data.missing_dependencies && data.missing_dependencies.length > 0);
+      // Figure out the state - missing_dependencies is an Object!
+      const missingKeys = data.missing_dependencies ? Object.keys(data.missing_dependencies) : [];
+      const isLocked = (!data.dependencies) || (missingKeys.length > 0);
 
       const option = document.createElement('option');
       option.value = key;
 
       if (isLocked) {
         option.textContent = `${text} — 🔒 Κλειδωμένο (Προϋποθέσεις)`;
-        option.style.color = '#777777';
+        option.style.color = '#ff4444'; // Red as requested
       } else if (data.can_upgrade === true) {
         option.textContent = `${text} — ✅ ${costStr}`;
       } else if (data.enough_resources === false) {
diff --git a/static/js/state.js b/static/js/state.js
index d5768a5..313cf98 100644
--- a/static/js/state.js
+++ b/static/js/state.js
@@ -15,7 +15,7 @@ window.BUILDING_NAMES_GR = {
   temple: "Ναός",
   barracks: "Στρατώνας",
   docks: "Λιμάνι",
-  market: "Αγορά",
+  market: "Παζάρι",
   hide: "Σπηλιά",
   lumber: "Ξυλουργείο",
   stoner: "Λατομείο",