Cosmetic header/footer refresh — slate blue header, cross-links

New eyebrow/headline/subhead matching sibling spaces' visual
language. Header recolored to #4a5a6e (header only, footer
gradient untouched). Added footer cross-links to GLMP,
Mathematics Database, and CopernicusAI. All existing sections,
content, and the working-prototype link left untouched.

index.html

@@ -9,6 +9,9 @@
         .gradient-bg {
             background: linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);
         }
+        .header-bg {
+            background: #4a5a6e;
+        }
         .card-hover {
             transition: transform 0.3s ease, box-shadow 0.3s ease;
         }
@@ -20,15 +23,16 @@
 </head>
 <body class="bg-gray-50">
     <!-- Header -->
-    <header class="gradient-bg text-white">
+    <header class="header-bg text-white">
         <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-16">
             <div class="text-center">
-                <div class="text-6xl mb-4">📚</div>
-                <h1 class="text-5xl font-bold mb-4">Research Paper Metadata Database</h1>
-                <p class="text-xl opacity-90 mb-6">Centralized Metadata Repository for Scientific Research</p>
-                <p class="text-lg opacity-75 max-w-3xl mx-auto mb-6">
-                    A structured metadata repository designed to enable AI-powered visualization and analysis 
-                    of research structure with the goal of expanding research in interesting, useful, and practical ways.
+                <p class="text-sm uppercase tracking-widest opacity-80 mb-3">
+                    Research Paper Metadata Database · Gary Welz · CUNY Graduate Center
+                </p>
+                <h1 class="text-4xl sm:text-5xl font-bold mb-4">62,000+ research papers, browsable and searchable</h1>
+                <p class="text-lg sm:text-xl opacity-90 max-w-3xl mx-auto mb-6">
+                    Research paper metadata serving GLMP, the Mathematics Database, and CopernicusAI.
+                    Updated daily.
                 </p>
                 <div class="mt-6">
                     <a href="https://storage.googleapis.com/regal-scholar-453620-r7-podcast-storage/papers-database-table.html" 
@@ -243,6 +247,13 @@
         <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 text-center">
             <p class="text-lg font-semibold mb-2">Research Paper Metadata Database</p>
             <p class="text-sm opacity-75">Part of the CopernicusAI Knowledge Engine</p>
+            <p class="text-sm opacity-90 mt-3">
+                <a href="https://huggingface.co/spaces/garywelz/glmp" target="_blank" rel="noopener noreferrer" class="hover:underline">GLMP</a>
+                &nbsp;·&nbsp;
+                <a href="https://huggingface.co/spaces/garywelz/mathematics-database" target="_blank" rel="noopener noreferrer" class="hover:underline">Mathematics Database</a>
+                &nbsp;·&nbsp;
+                <a href="https://huggingface.co/spaces/garywelz/copernicusai" target="_blank" rel="noopener noreferrer" class="hover:underline">CopernicusAI</a>
+            </p>
             <p class="text-xs opacity-50 mt-4">&copy; 2025 Gary Welz. All rights reserved.</p>
         </div>
     </footer>