added bg for UI

S2FApp/static/s2f_styles.css

@@ -11,9 +11,45 @@ html, body, .stApp {
     font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif !important;
 }
 
+/* === Modern background patterns === */
+.stApp {
+    background-color: #fafbfc !important;
+    background-image:
+        /* Subtle dot grid */
+        radial-gradient(circle at 1px 1px, rgba(148, 163, 184, 0.12) 1px, transparent 0);
+    background-size: 28px 28px !important;
+    background-position: 0 0, 0 0 !important;
+}
+/* Soft gradient overlay for depth */
+.stApp::before {
+    content: '';
+    position: fixed;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    background:
+        radial-gradient(ellipse 80% 50% at 70% -20%, rgba(var(--s2f-primary-rgb), 0.06) 0%, transparent 50%),
+        radial-gradient(ellipse 60% 40% at 0% 100%, rgba(var(--s2f-primary-rgb), 0.04) 0%, transparent 50%);
+    pointer-events: none;
+    z-index: 0;
+}
+/* Ensure content sits above background */
+.stApp > div,
+.block-container,
+section[data-testid="stSidebar"] {
+    position: relative;
+    z-index: 1;
+}
+
 /* === Header banner === */
 .s2f-header {
-    background: linear-gradient(135deg, var(--s2f-primary) 0%, var(--s2f-primary-dark) 40%, var(--s2f-primary-darker) 100%);
+    background:
+        /* Subtle grid overlay (drawn on top) */
+        linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
+        linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px),
+        linear-gradient(135deg, var(--s2f-primary) 0%, var(--s2f-primary-dark) 40%, var(--s2f-primary-darker) 100%);
+    background-size: 20px 20px, 20px 20px, 100% 100%;
     padding: 1.1rem 1.5rem 1rem;
     border-radius: 12px;
     margin-bottom: 0.5rem;
@@ -63,7 +99,16 @@ html, body, .stApp {
 /* === Sidebar === */
 section[data-testid="stSidebar"] {
     width: 360px !important;
-    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%) !important;
+    background:
+        linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%),
+        /* Subtle vertical rhythm */
+        repeating-linear-gradient(
+            90deg,
+            transparent,
+            transparent 89px,
+            rgba(203, 213, 225, 0.25) 89px,
+            rgba(203, 213, 225, 0.25) 90px
+        ) !important;
     border-right: 1px solid #e2e8f0 !important;
 }
 @media (max-width: 768px) {