Add hamburger nav menu with 4-page navigation structure

- NavDrawer component: slide-in left drawer with backdrop, matches dark theme
- Nav items: Home, Reporting, Knowledge Base, Exports with color-coded icons
- Active page highlighted with colored background + indicator dot
- Placeholder pages for Reporting (amber), Knowledge Base (green), Exports (purple)
- Stats bar and three-column layout conditionally render on Home page only
- currentPage state drives all page switching

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/App.js

@@ -1,5 +1,5 @@
 import React, { useState, useEffect } from 'react';
-import { Search, FileText, AlertCircle, Download, Upload, Eye, Filter, CheckCircle, XCircle, Loader, Trash2, Plus, RefreshCw, Edit2, ChevronDown, Shield, Activity } from 'lucide-react';
+import { Search, FileText, AlertCircle, Download, Upload, Eye, Filter, CheckCircle, XCircle, Loader, Trash2, Plus, RefreshCw, Edit2, ChevronDown, Shield, Activity, Menu } from 'lucide-react';
 import { useAuth } from './contexts/AuthContext';
 import LoginForm from './components/LoginForm';
 import UserMenu from './components/UserMenu';
@@ -8,6 +8,10 @@ import AuditLog from './components/AuditLog';
 import NvdSyncModal from './components/NvdSyncModal';
 import KnowledgeBaseModal from './components/KnowledgeBaseModal';
 import KnowledgeBaseViewer from './components/KnowledgeBaseViewer';
+import NavDrawer from './components/NavDrawer';
+import ReportingPage from './components/pages/ReportingPage';
+import KnowledgeBasePage from './components/pages/KnowledgeBasePage';
+import ExportsPage from './components/pages/ExportsPage';
 import './App.css';
 
 const API_BASE = process.env.REACT_APP_API_BASE || 'http://localhost:3001/api';
@@ -171,6 +175,8 @@ export default function App() {
   const [cveDocuments, setCveDocuments] = useState({});
   const [quickCheckCVE, setQuickCheckCVE] = useState('');
   const [quickCheckResult, setQuickCheckResult] = useState(null);
+  const [currentPage, setCurrentPage] = useState('home');
+  const [navOpen, setNavOpen] = useState(false);
   const [showAddCVE, setShowAddCVE] = useState(false);
   const [showUserManagement, setShowUserManagement] = useState(false);
   const [showAuditLog, setShowAuditLog] = useState(false);
@@ -950,6 +956,12 @@ export default function App() {
 
   return (
     <div className="min-h-screen bg-intel-darkest grid-bg p-6 relative overflow-hidden fade-in">
+      <NavDrawer
+        isOpen={navOpen}
+        onClose={() => setNavOpen(false)}
+        currentPage={currentPage}
+        onNavigate={setCurrentPage}
+      />
       {/* Scanning line effect */}
       <div className="scan-line"></div>
 
@@ -957,12 +969,23 @@ export default function App() {
         {/* Header */}
         <div className="mb-8">
           <div className="flex justify-between items-start mb-6">
-            <div className="flex-1">
+            <div className="flex items-center gap-4 flex-1">
+              <button
+                onClick={() => setNavOpen(true)}
+                style={{ background: 'none', border: '1px solid rgba(14, 165, 233, 0.25)', borderRadius: '0.375rem', padding: '0.5rem', cursor: 'pointer', color: '#64748B', flexShrink: 0 }}
+                onMouseEnter={e => { e.currentTarget.style.color = '#0EA5E9'; e.currentTarget.style.borderColor = 'rgba(14, 165, 233, 0.6)'; }}
+                onMouseLeave={e => { e.currentTarget.style.color = '#64748B'; e.currentTarget.style.borderColor = 'rgba(14, 165, 233, 0.25)'; }}
+                title="Navigation"
+              >
+                <Menu className="w-5 h-5" />
+              </button>
+              <div>
                 <h1 className="text-4xl font-bold text-intel-accent mb-1 font-mono tracking-tight">
                   STEAM Security Dashboard
                 </h1>
                 <p className="text-gray-400 text-sm font-sans">NTS Threat Intelligence and Metric Aggregation</p>
               </div>
+            </div>
             <div className="flex items-center gap-3">
               {canWrite() && (
                 <button
@@ -986,8 +1009,8 @@ export default function App() {
             </div>
           </div>
 
-          {/* Stats Bar - Modern refined styling */}
-          <div className="grid grid-cols-1 md:grid-cols-4 gap-4">
+          {/* Stats Bar - only shown on Home page */}
+          {currentPage === 'home' && <div className="grid grid-cols-1 md:grid-cols-4 gap-4">
             <div style={STYLES.statCard}>
               <div style={{ position: 'absolute', top: 0, left: 0, right: 0, height: '2px', background: 'linear-gradient(90deg, transparent, #0EA5E9, transparent)', boxShadow: '0 0 8px rgba(14, 165, 233, 0.5)' }}></div>
               <div style={{ fontSize: '0.75rem', textTransform: 'uppercase', letterSpacing: '0.1em', color: '#CBD5E1', marginBottom: '0.25rem' }}>Total CVEs</div>
@@ -1008,8 +1031,13 @@ export default function App() {
               <div style={{ fontSize: '0.75rem', textTransform: 'uppercase', letterSpacing: '0.1em', color: '#CBD5E1', marginBottom: '0.25rem' }}>Critical</div>
               <div style={{ fontSize: '1.5rem', fontWeight: '700', fontFamily: 'monospace', color: '#EF4444', textShadow: '0 0 16px rgba(239, 68, 68, 0.4)' }}>{cves.filter(c => c.severity === 'Critical').length}</div>
             </div>
+          </div>}
         </div>
-        </div>
+
+        {/* Page content */}
+        {currentPage === 'reporting'      && <ReportingPage />}
+        {currentPage === 'knowledge-base' && <KnowledgeBasePage />}
+        {currentPage === 'exports'        && <ExportsPage />}
 
         {/* User Management Modal */}
         {showUserManagement && (
@@ -1624,8 +1652,8 @@ export default function App() {
           </div>
         )}
 
-        {/* Three Column Layout */}
-        <div className="grid grid-cols-12 gap-6">
+        {/* Three Column Layout - Home page only */}
+        {currentPage === 'home' && <div className="grid grid-cols-12 gap-6">
           {/* LEFT PANEL - Wiki/Knowledge Base */}
           <div className="col-span-12 lg:col-span-3 space-y-4">
             <div style={{...STYLES.intelCard, padding: '1.5rem', borderLeft: '3px solid #10B981'}} className="rounded-lg">
@@ -2472,7 +2500,7 @@ export default function App() {
           </div>
           {/* End Right Panel */}
 
-        </div>
+        </div>}
         {/* End Three Column Layout */}
       </div>
     </div>

frontend/src/components/NavDrawer.js

@@ -0,0 +1,127 @@
+import React from 'react';
+import { X, Home, BarChart2, BookOpen, Download } from 'lucide-react';
+
+const NAV_ITEMS = [
+  { id: 'home',           label: 'Home',           icon: Home,     color: '#0EA5E9', description: 'Main dashboard'            },
+  { id: 'reporting',      label: 'Reporting',      icon: BarChart2,color: '#F59E0B', description: 'Reports & analytics'       },
+  { id: 'knowledge-base', label: 'Knowledge Base', icon: BookOpen, color: '#10B981', description: 'Articles & documentation'   },
+  { id: 'exports',        label: 'Exports',        icon: Download, color: '#8B5CF6', description: 'Export data & reports'      },
+];
+
+export default function NavDrawer({ isOpen, onClose, currentPage, onNavigate }) {
+  if (!isOpen) return null;
+
+  return (
+    <>
+      {/* Backdrop */}
+      <div
+        onClick={onClose}
+        style={{
+          position: 'fixed', inset: 0,
+          background: 'rgba(0, 0, 0, 0.65)',
+          backdropFilter: 'blur(3px)',
+          zIndex: 50
+        }}
+      />
+
+      {/* Drawer */}
+      <div style={{
+        position: 'fixed', top: 0, left: 0, bottom: 0, width: '280px',
+        background: 'linear-gradient(180deg, #0F1A2E 0%, #0A1628 100%)',
+        borderRight: '1px solid rgba(14, 165, 233, 0.2)',
+        boxShadow: '6px 0 32px rgba(0, 0, 0, 0.7)',
+        zIndex: 51,
+        display: 'flex', flexDirection: 'column',
+        padding: '1.5rem'
+      }}>
+        {/* Drawer header */}
+        <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'flex-start', marginBottom: '2rem' }}>
+          <div>
+            <div style={{ fontFamily: 'monospace', fontSize: '1rem', fontWeight: '700', color: '#0EA5E9', textTransform: 'uppercase', letterSpacing: '0.15em', textShadow: '0 0 12px rgba(14, 165, 233, 0.5)' }}>
+              STEAM
+            </div>
+            <div style={{ fontFamily: 'monospace', fontSize: '0.65rem', color: '#475569', textTransform: 'uppercase', letterSpacing: '0.1em', marginTop: '2px' }}>
+              Security Dashboard
+            </div>
+          </div>
+          <button
+            onClick={onClose}
+            style={{ color: '#475569', padding: '0.25rem', background: 'none', border: 'none', cursor: 'pointer', lineHeight: 1 }}
+            onMouseEnter={e => e.currentTarget.style.color = '#E2E8F0'}
+            onMouseLeave={e => e.currentTarget.style.color = '#475569'}
+          >
+            <X style={{ width: '20px', height: '20px' }} />
+          </button>
+        </div>
+
+        {/* Nav items */}
+        <nav style={{ display: 'flex', flexDirection: 'column', gap: '0.375rem' }}>
+          {NAV_ITEMS.map(({ id, label, icon: Icon, color, description }) => {
+            const active = currentPage === id;
+            return (
+              <button
+                key={id}
+                onClick={() => { onNavigate(id); onClose(); }}
+                style={{
+                  display: 'flex', alignItems: 'center', gap: '0.875rem',
+                  padding: '0.75rem 0.875rem',
+                  borderRadius: '0.5rem',
+                  border: active ? `1px solid ${color}50` : '1px solid transparent',
+                  background: active ? `${color}18` : 'transparent',
+                  cursor: 'pointer', textAlign: 'left', width: '100%',
+                  transition: 'background 0.15s, border-color 0.15s'
+                }}
+                onMouseEnter={e => { if (!active) e.currentTarget.style.background = 'rgba(255,255,255,0.04)'; }}
+                onMouseLeave={e => { if (!active) e.currentTarget.style.background = 'transparent'; }}
+              >
+                {/* Icon box */}
+                <div style={{
+                  width: '36px', height: '36px', flexShrink: 0,
+                  borderRadius: '0.375rem',
+                  background: `${color}18`,
+                  border: `1px solid ${color}40`,
+                  display: 'flex', alignItems: 'center', justifyContent: 'center'
+                }}>
+                  <Icon style={{ width: '17px', height: '17px', color }} />
+                </div>
+
+                {/* Label + description */}
+                <div style={{ flex: 1, minWidth: 0 }}>
+                  <div style={{
+                    fontFamily: 'monospace', fontSize: '0.8rem', fontWeight: '600',
+                    color: active ? color : '#CBD5E1',
+                    textTransform: 'uppercase', letterSpacing: '0.06em'
+                  }}>
+                    {label}
+                  </div>
+                  <div style={{ fontSize: '0.68rem', color: '#475569', marginTop: '1px' }}>
+                    {description}
+                  </div>
+                </div>
+
+                {/* Active indicator dot */}
+                {active && (
+                  <div style={{
+                    width: '6px', height: '6px', borderRadius: '50%',
+                    background: color, boxShadow: `0 0 8px ${color}`, flexShrink: 0
+                  }} />
+                )}
+              </button>
+            );
+          })}
+        </nav>
+
+        {/* Footer */}
+        <div style={{
+          marginTop: 'auto', paddingTop: '1rem',
+          borderTop: '1px solid rgba(255, 255, 255, 0.05)',
+          textAlign: 'center'
+        }}>
+          <div style={{ fontSize: '0.6rem', color: '#1E293B', fontFamily: 'monospace', textTransform: 'uppercase', letterSpacing: '0.1em' }}>
+            NTS Threat Intelligence
+          </div>
+        </div>
+      </div>
+    </>
+  );
+}

frontend/src/components/pages/ExportsPage.js

@@ -0,0 +1,25 @@
+import React from 'react';
+import { Download } from 'lucide-react';
+
+export default function ExportsPage() {
+  return (
+    <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'center', minHeight: '60vh' }}>
+      <div style={{ textAlign: 'center' }}>
+        <div style={{
+          width: '72px', height: '72px', borderRadius: '1rem', margin: '0 auto 1.5rem',
+          background: 'rgba(139, 92, 246, 0.1)',
+          border: '1px solid rgba(139, 92, 246, 0.3)',
+          display: 'flex', alignItems: 'center', justifyContent: 'center'
+        }}>
+          <Download style={{ width: '36px', height: '36px', color: '#8B5CF6' }} />
+        </div>
+        <h2 style={{ fontFamily: 'monospace', fontSize: '1.5rem', fontWeight: '700', color: '#8B5CF6', textTransform: 'uppercase', letterSpacing: '0.1em', marginBottom: '0.5rem' }}>
+          Exports
+        </h2>
+        <p style={{ color: '#475569', fontSize: '0.875rem', fontFamily: 'monospace' }}>
+          Under construction — coming soon
+        </p>
+      </div>
+    </div>
+  );
+}

frontend/src/components/pages/KnowledgeBasePage.js

@@ -0,0 +1,25 @@
+import React from 'react';
+import { BookOpen } from 'lucide-react';
+
+export default function KnowledgeBasePage() {
+  return (
+    <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'center', minHeight: '60vh' }}>
+      <div style={{ textAlign: 'center' }}>
+        <div style={{
+          width: '72px', height: '72px', borderRadius: '1rem', margin: '0 auto 1.5rem',
+          background: 'rgba(16, 185, 129, 0.1)',
+          border: '1px solid rgba(16, 185, 129, 0.3)',
+          display: 'flex', alignItems: 'center', justifyContent: 'center'
+        }}>
+          <BookOpen style={{ width: '36px', height: '36px', color: '#10B981' }} />
+        </div>
+        <h2 style={{ fontFamily: 'monospace', fontSize: '1.5rem', fontWeight: '700', color: '#10B981', textTransform: 'uppercase', letterSpacing: '0.1em', marginBottom: '0.5rem' }}>
+          Knowledge Base
+        </h2>
+        <p style={{ color: '#475569', fontSize: '0.875rem', fontFamily: 'monospace' }}>
+          Under construction — coming soon
+        </p>
+      </div>
+    </div>
+  );
+}

frontend/src/components/pages/ReportingPage.js

@@ -0,0 +1,25 @@
+import React from 'react';
+import { BarChart2 } from 'lucide-react';
+
+export default function ReportingPage() {
+  return (
+    <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'center', minHeight: '60vh' }}>
+      <div style={{ textAlign: 'center' }}>
+        <div style={{
+          width: '72px', height: '72px', borderRadius: '1rem', margin: '0 auto 1.5rem',
+          background: 'rgba(245, 158, 11, 0.1)',
+          border: '1px solid rgba(245, 158, 11, 0.3)',
+          display: 'flex', alignItems: 'center', justifyContent: 'center'
+        }}>
+          <BarChart2 style={{ width: '36px', height: '36px', color: '#F59E0B' }} />
+        </div>
+        <h2 style={{ fontFamily: 'monospace', fontSize: '1.5rem', fontWeight: '700', color: '#F59E0B', textTransform: 'uppercase', letterSpacing: '0.1em', marginBottom: '0.5rem' }}>
+          Reporting
+        </h2>
+        <p style={{ color: '#475569', fontSize: '0.875rem', fontFamily: 'monospace' }}>
+          Under construction — coming soon
+        </p>
+      </div>
+    </div>
+  );
+}