feat: Implement responsive design for tablet and mobile breakpoints

- Add useBreakpoint hook for responsive breakpoint detection
- Add MobileBottomNav component for mobile navigation
- Update ClinicalSidebar with tablet icon-only mode and tooltips
- Update PatientBanner with mobile minimal mode and overflow menu
- Update PMRInterface to handle responsive layouts and mobile search
- Add mobile card layouts to MedicationsView, ProblemsView,
  InvestigationsView, and DocumentsView
- Desktop: 220px sidebar, full banner, tables
- Tablet: 56px icon sidebar, condensed banner, scrollable tables
- Mobile: Bottom nav, minimal banner, card layouts, search bar

src/components/ClinicalSidebar.tsx

@@ -22,6 +22,7 @@ interface NavItem {
 interface ClinicalSidebarProps {
   activeView: ViewId
   onViewChange: (view: ViewId) => void
+  isTablet?: boolean
 }
 
 const navItems: NavItem[] = [
@@ -42,11 +43,12 @@ function getCurrentTime(): string {
   })
 }
 
-export function ClinicalSidebar({ activeView, onViewChange }: ClinicalSidebarProps) {
+export function ClinicalSidebar({ activeView, onViewChange, isTablet = false }: ClinicalSidebarProps) {
   const [currentTime, setCurrentTime] = useState(getCurrentTime)
   const [searchQuery, setSearchQuery] = useState('')
   const [isSearchFocused, setIsSearchFocused] = useState(false)
   const [focusedIndex, setFocusedIndex] = useState<number | null>(null)
+  const [hoveredItem, setHoveredItem] = useState<ViewId | null>(null)
   const navButtonRefs = useRef<(HTMLButtonElement | null)[]>([])
   const { focusAfterLoginRef } = useAccessibility()
 
@@ -161,6 +163,69 @@ export function ClinicalSidebar({ activeView, onViewChange }: ClinicalSidebarPro
     )
   }, [searchQuery])
 
+  if (isTablet) {
+    return (
+      <aside
+        role="navigation"
+        aria-label="Clinical record navigation"
+        className="hidden md:flex lg:hidden flex-col w-14 h-screen sticky top-0 bg-pmr-sidebar text-white"
+      >
+        <div className="p-2 border-b border-white/10">
+          <div className="font-inter font-medium text-[10px] text-white/50 text-center leading-tight">
+            PMR
+          </div>
+        </div>
+
+        <nav className="flex-1 py-2 overflow-y-auto">
+          <ul role="menu" aria-label="Record sections">
+            {navItems.map((item, index) => (
+              <li key={item.id} role="none" className="relative">
+                {index === 1 && (
+                  <div className="mx-2 my-1 border-t border-white/10" role="separator" aria-hidden="true" />
+                )}
+                <button
+                  ref={el => { navButtonRefs.current[index] = el }}
+                  type="button"
+                  role="menuitem"
+                  tabIndex={focusedIndex === null ? (index === 0 ? 0 : -1) : (focusedIndex === index ? 0 : -1)}
+                  aria-current={activeView === item.id ? 'page' : undefined}
+                  aria-label={item.label}
+                  onClick={() => handleNavClick(item.id)}
+                  onKeyDown={e => handleNavKeyDown(e, index)}
+                  onMouseEnter={() => setHoveredItem(item.id)}
+                  onMouseLeave={() => setHoveredItem(null)}
+                  className={`
+                    w-full flex items-center justify-center h-11
+                    transition-colors relative
+                    ${activeView === item.id
+                      ? 'text-white bg-white/12 border-l-[3px] border-pmr-nhsblue'
+                      : 'text-white/70 hover:text-white hover:bg-white/8'}
+                  `}
+                >
+                  <span className={activeView === item.id ? 'text-white' : 'text-white/60'}>
+                    {item.icon}
+                  </span>
+                  {hoveredItem === item.id && (
+                    <div className="absolute left-full ml-2 px-2 py-1 bg-gray-900 text-white text-xs rounded whitespace-nowrap z-50 font-inter">
+                      {item.label}
+                    </div>
+                  )}
+                </button>
+              </li>
+            ))}
+          </ul>
+        </nav>
+
+        <div className="p-2 border-t border-white/10">
+          <div className="font-inter text-[9px] text-slate-400 text-center leading-relaxed">
+            <div>A.C</div>
+            <div>{currentTime}</div>
+          </div>
+        </div>
+      </aside>
+    )
+  }
+
   return (
     <aside
       role="navigation"

src/components/MobileBottomNav.tsx

@@ -0,0 +1,69 @@
+import { ClipboardList, FileText, Pill, AlertTriangle, FlaskConical, FolderOpen, Send } from 'lucide-react'
+import type { ViewId } from '../types/pmr'
+
+interface NavItem {
+  id: ViewId
+  label: string
+  shortLabel: string
+  icon: React.ReactNode
+}
+
+const navItems: NavItem[] = [
+  { id: 'summary', label: 'Summary', shortLabel: 'Summary', icon: <ClipboardList size={20} /> },
+  { id: 'consultations', label: 'Consultations', shortLabel: 'Consult', icon: <FileText size={20} /> },
+  { id: 'medications', label: 'Medications', shortLabel: 'Meds', icon: <Pill size={20} /> },
+  { id: 'problems', label: 'Problems', shortLabel: 'Issues', icon: <AlertTriangle size={20} /> },
+  { id: 'investigations', label: 'Investigations', shortLabel: 'Tests', icon: <FlaskConical size={20} /> },
+  { id: 'documents', label: 'Documents', shortLabel: 'Docs', icon: <FolderOpen size={20} /> },
+  { id: 'referrals', label: 'Referrals', shortLabel: 'Refer', icon: <Send size={20} /> },
+]
+
+interface MobileBottomNavProps {
+  activeView: ViewId
+  onViewChange: (view: ViewId) => void
+}
+
+export function MobileBottomNav({ activeView, onViewChange }: MobileBottomNavProps) {
+  const handleNavClick = (view: ViewId) => {
+    onViewChange(view)
+    window.location.hash = view
+  }
+
+  return (
+    <nav
+      className="fixed bottom-0 left-0 right-0 z-50 bg-pmr-sidebar border-t border-white/10"
+      style={{ paddingBottom: 'env(safe-area-inset-bottom)' }}
+      role="navigation"
+      aria-label="Mobile navigation"
+    >
+      <ul className="flex items-center justify-around h-14">
+        {navItems.map((item) => {
+          const isActive = activeView === item.id
+          return (
+            <li key={item.id}>
+              <button
+                type="button"
+                onClick={() => handleNavClick(item.id)}
+                className={`
+                  flex flex-col items-center justify-center
+                  w-12 h-14 rounded-lg
+                  transition-colors duration-100
+                  ${isActive 
+                    ? 'text-pmr-nhsblue' 
+                    : 'text-white/60 hover:text-white/90'}
+                `}
+                aria-current={isActive ? 'page' : undefined}
+                aria-label={item.label}
+              >
+                {item.icon}
+                <span className="text-[10px] mt-0.5 font-inter font-medium">
+                  {item.shortLabel}
+                </span>
+              </button>
+            </li>
+          )
+        })}
+      </ul>
+    </nav>
+  )
+}

src/components/PMRInterface.tsx

@@ -1,7 +1,9 @@
 import { useState, useEffect, useRef } from 'react'
+import { Search, X, ArrowLeft } from 'lucide-react'
 import type { ViewId } from '../types/pmr'
 import { ClinicalSidebar } from './ClinicalSidebar'
 import { PatientBanner } from './PatientBanner'
+import { MobileBottomNav } from './MobileBottomNav'
 import { SummaryView } from './views/SummaryView'
 import { ConsultationsView } from './views/ConsultationsView'
 import { MedicationsView } from './views/MedicationsView'
@@ -10,6 +12,7 @@ import { InvestigationsView } from './views/InvestigationsView'
 import { DocumentsView } from './views/DocumentsView'
 import { ReferralsView } from './views/ReferralsView'
 import { useAccessibility } from '../contexts/AccessibilityContext'
+import { useBreakpoint } from '../hooks/useBreakpoint'
 
 interface PMRInterfaceProps {
   children?: React.ReactNode
@@ -30,8 +33,11 @@ function PMRContent({ children }: PMRInterfaceProps) {
     return validViews.includes(hash) ? hash : 'summary'
   })
   
+  const [mobileSearchQuery, setMobileSearchQuery] = useState('')
+  
   const viewHeadingRef = useRef<HTMLDivElement>(null)
   const { requestFocusAfterViewChange, expandedItemId, setExpandedItem } = useAccessibility()
+  const { isMobile, isTablet } = useBreakpoint()
 
   useEffect(() => {
     requestFocusAfterViewChange()
@@ -55,6 +61,11 @@ function PMRContent({ children }: PMRInterfaceProps) {
     }
   }
 
+  const handleBackToSummary = () => {
+    handleViewChange('summary')
+    window.location.hash = 'summary'
+  }
+
   const renderView = () => {
     switch (activeView) {
       case 'summary':
@@ -97,14 +108,31 @@ function PMRContent({ children }: PMRInterfaceProps) {
 
   return (
     <div className="min-h-screen bg-pmr-content">
-      <PatientBanner />
+      <PatientBanner isMobile={isMobile} isTablet={isTablet} />
       <div className="flex">
-        <ClinicalSidebar activeView={activeView} onViewChange={handleViewChange} />
+        {!isMobile && (
+          <ClinicalSidebar 
+            activeView={activeView} 
+            onViewChange={handleViewChange}
+            isTablet={isTablet}
+          />
+        )}
         <main
           role="main"
           aria-label={`${activeView} view`}
-          className="flex-1 min-h-[calc(100vh-80px)] p-6"
+          className={`
+            flex-1 p-4 md:p-6
+            ${isMobile ? 'pb-20' : ''}
+            ${isTablet ? 'min-h-[calc(100vh-48px)]' : 'min-h-[calc(100vh-80px)]'}
+          `}
         >
+          {isMobile && (
+            <MobileSearchBar
+              query={mobileSearchQuery}
+              onChange={setMobileSearchQuery}
+            />
+          )}
+          
           <div
             ref={viewHeadingRef}
             tabIndex={-1}
@@ -113,9 +141,63 @@ function PMRContent({ children }: PMRInterfaceProps) {
           >
             <h1 className="sr-only">{viewLabels[activeView]}</h1>
           </div>
+          
+          {isMobile && activeView !== 'summary' && (
+            <button
+              type="button"
+              onClick={handleBackToSummary}
+              className="flex items-center gap-1 text-pmr-nhsblue text-sm font-inter font-medium mb-4 hover:underline"
+            >
+              <ArrowLeft size={14} />
+              Back to Summary
+            </button>
+          )}
+          
           {children || renderView()}
         </main>
       </div>
+      
+      {isMobile && (
+        <MobileBottomNav 
+          activeView={activeView} 
+          onViewChange={handleViewChange}
+        />
+      )}
+    </div>
+  )
+}
+
+interface MobileSearchBarProps {
+  query: string
+  onChange: (query: string) => void
+}
+
+function MobileSearchBar({ query, onChange }: MobileSearchBarProps) {
+  return (
+    <div className="mb-4">
+      <div className="relative">
+        <Search
+          size={16}
+          className="absolute left-3 top-1/2 -translate-y-1/2 text-gray-400 pointer-events-none"
+        />
+        <input
+          type="text"
+          placeholder="Search record..."
+          value={query}
+          onChange={e => onChange(e.target.value)}
+          className="w-full h-10 pl-10 pr-10 bg-white border border-gray-200 rounded text-sm font-inter text-gray-900 placeholder-gray-400 focus:outline-none focus:border-pmr-nhsblue focus:ring-1 focus:ring-pmr-nhsblue/20 transition-colors"
+        />
+        {query && (
+          <button
+            type="button"
+            onClick={() => onChange('')}
+            className="absolute right-3 top-1/2 -translate-y-1/2 text-gray-400 hover:text-gray-600 transition-colors"
+            aria-label="Clear search"
+          >
+            <X size={16} />
+          </button>
+        )}
+      </div>
     </div>
   )
 }

src/components/PatientBanner.tsx

@@ -1,10 +1,31 @@
-import { Download, Mail, Linkedin } from 'lucide-react'
+import { Download, Mail, Linkedin, MoreHorizontal } from 'lucide-react'
+import { useState } from 'react'
 import { patient } from '@/data/patient'
 import { useScrollCondensation } from '@/hooks/useScrollCondensation'
 
-export function PatientBanner() {
+interface PatientBannerProps {
+  isMobile?: boolean
+  isTablet?: boolean
+}
+
+export function PatientBanner({ isMobile = false, isTablet = false }: PatientBannerProps) {
   const { isCondensed, sentinelRef } = useScrollCondensation({ threshold: 100 })
 
+  if (isMobile) {
+    return (
+      <>
+        <div
+          ref={sentinelRef}
+          className="h-0 w-full absolute top-0"
+          aria-hidden="true"
+        />
+        <MobileBanner />
+      </>
+    )
+  }
+
+  const shouldCondense = isTablet || isCondensed
+
   return (
     <>
       <div
@@ -17,11 +38,11 @@ export function PatientBanner() {
           sticky top-0 z-40 w-full
           bg-pmr-banner border-b border-slate-600
           transition-all duration-200 ease-out
-          ${isCondensed ? 'h-12' : 'h-20'}
+          ${shouldCondense ? 'h-12' : 'h-20'}
         `}
         role="banner"
       >
-        {isCondensed ? (
+        {shouldCondense ? (
           <CondensedBanner />
         ) : (
           <FullBanner />
@@ -31,6 +52,78 @@ export function PatientBanner() {
   )
 }
 
+function MobileBanner() {
+  const [showOverflow, setShowOverflow] = useState(false)
+
+  return (
+    <header
+      className="sticky top-0 z-40 w-full h-12 bg-pmr-banner border-b border-slate-600"
+      role="banner"
+    >
+      <div className="h-full px-3 flex items-center justify-between gap-2">
+        <div className="flex items-center gap-2 min-w-0 flex-1">
+          <h1 className="font-inter font-semibold text-white text-sm tracking-tight truncate">
+            CHARLWOOD, A (Mr)
+          </h1>
+          <span className="text-slate-500">|</span>
+          <span className="font-geist text-xs text-slate-300">
+            221 181 0
+          </span>
+          <StatusDot status="Active" />
+        </div>
+        <div className="relative">
+          <button
+            type="button"
+            onClick={() => setShowOverflow(!showOverflow)}
+            className="p-2 text-white/70 hover:text-white transition-colors"
+            aria-label="Actions menu"
+            aria-expanded={showOverflow}
+          >
+            <MoreHorizontal size={18} />
+          </button>
+          {showOverflow && (
+            <>
+              <div 
+                className="fixed inset-0 z-40" 
+                onClick={() => setShowOverflow(false)}
+                aria-hidden="true"
+              />
+              <div className="absolute right-0 top-full mt-1 w-40 bg-white border border-gray-200 rounded shadow-lg z-50 py-1">
+                <a
+                  href="/cv.pdf"
+                  className="flex items-center gap-2 px-3 py-2 text-sm text-gray-700 hover:bg-gray-50"
+                  onClick={() => setShowOverflow(false)}
+                >
+                  <Download size={14} />
+                  Download CV
+                </a>
+                <a
+                  href={`mailto:${patient.email}`}
+                  className="flex items-center gap-2 px-3 py-2 text-sm text-gray-700 hover:bg-gray-50"
+                  onClick={() => setShowOverflow(false)}
+                >
+                  <Mail size={14} />
+                  Email
+                </a>
+                <a
+                  href={`https://${patient.linkedin}`}
+                  target="_blank"
+                  rel="noopener noreferrer"
+                  className="flex items-center gap-2 px-3 py-2 text-sm text-gray-700 hover:bg-gray-50"
+                  onClick={() => setShowOverflow(false)}
+                >
+                  <Linkedin size={14} />
+                  LinkedIn
+                </a>
+              </div>
+            </>
+          )}
+        </div>
+      </div>
+    </header>
+  )
+}
+
 function FullBanner() {
   return (
     <div className="h-full px-4 lg:px-6 flex flex-col justify-center">

src/components/views/DocumentsView.tsx

@@ -2,6 +2,7 @@ import { useState, useEffect, useRef } from 'react'
 import { ChevronDown, ChevronUp, FileText, Award, GraduationCap, FlaskConical } from 'lucide-react'
 import { documents } from '@/data/documents'
 import type { Document, DocumentType } from '@/types/pmr'
+import { useBreakpoint } from '@/hooks/useBreakpoint'
 
 function DocumentTypeIcon({ type }: { type: DocumentType }) {
   const iconMap: Record<DocumentType, React.ReactNode> = {
@@ -136,15 +137,110 @@ function DocumentRow({
   )
 }
 
+function MobileDocumentCard({
+  document,
+  isExpanded,
+  onToggle,
+}: {
+  document: Document
+  isExpanded: boolean
+  onToggle: () => void
+}) {
+  return (
+    <div className="bg-white border border-gray-200 rounded">
+      <button
+        type="button"
+        onClick={onToggle}
+        className="w-full p-4 text-left"
+        aria-expanded={isExpanded}
+      >
+        <div className="flex items-start justify-between gap-3">
+          <div className="flex-1 min-w-0">
+            <div className="flex items-center gap-2 mb-1">
+              <DocumentTypeIcon type={document.type} />
+              <span className="text-xs text-gray-500">{document.type}</span>
+            </div>
+            <h3 className="font-inter font-medium text-sm text-gray-900">
+              {document.title}
+            </h3>
+            <div className="flex items-center gap-2 mt-1.5 text-xs text-gray-500">
+              <span className="font-geist">{document.date}</span>
+              <span>•</span>
+              <span>{document.source}</span>
+            </div>
+          </div>
+          <div className="flex-shrink-0 mt-1">
+            {isExpanded ? (
+              <ChevronUp size={16} className="text-gray-400" />
+            ) : (
+              <ChevronDown size={16} className="text-gray-400" />
+            )}
+          </div>
+        </div>
+      </button>
+      {isExpanded && (
+        <div className="px-4 pb-4 border-t border-gray-100">
+          <div className="pt-3 font-mono text-xs text-gray-700 leading-relaxed space-y-2">
+            <div className="flex">
+              <span className="text-gray-400 w-28 shrink-0">Type:</span>
+              <span>{document.type}</span>
+            </div>
+            <div className="flex">
+              <span className="text-gray-400 w-28 shrink-0">Date Awarded:</span>
+              <span>{document.date}</span>
+            </div>
+            {document.institution && (
+              <div className="flex">
+                <span className="text-gray-400 w-28 shrink-0">Institution:</span>
+                <span>{document.institution}</span>
+              </div>
+            )}
+            {document.classification && (
+              <div className="flex">
+                <span className="text-gray-400 w-28 shrink-0">Classification:</span>
+                <span>{document.classification}</span>
+              </div>
+            )}
+            {document.duration && (
+              <div className="flex">
+                <span className="text-gray-400 w-28 shrink-0">Duration:</span>
+                <span>{document.duration}</span>
+              </div>
+            )}
+            {document.researchDetail && (
+              <div className="flex flex-col">
+                <span className="text-gray-400 w-28 shrink-0">Research:</span>
+                <span className="mt-1">
+                  {document.researchDetail}
+                  {document.researchGrade && (
+                    <><br />Grade: {document.researchGrade}</>
+                  )}
+                </span>
+              </div>
+            )}
+            {document.notes && (
+              <div className="flex flex-col">
+                <span className="text-gray-400 w-28 shrink-0">Notes:</span>
+                <span className="mt-1 text-gray-600">{document.notes}</span>
+              </div>
+            )}
+          </div>
+        </div>
+      )}
+    </div>
+  )
+}
+
 export function DocumentsView() {
   const [expandedId, setExpandedId] = useState<string | null>(null)
+  const { isMobile } = useBreakpoint()
 
   const handleToggle = (id: string) => {
     setExpandedId(expandedId === id ? null : id)
   }
 
   return (
-    <div className="bg-white border border-gray-200 rounded">
+    <div className="bg-white border border-gray-200 rounded overflow-hidden">
       <div className="bg-gray-50 border-b border-gray-200 px-4 py-3">
         <h2 className="font-inter font-semibold text-sm uppercase tracking-wider text-gray-500">
           Attached Documents
@@ -153,6 +249,18 @@ export function DocumentsView() {
           Education and certifications presented as attached documents in the patient record.
         </p>
       </div>
+      {isMobile ? (
+        <div className="p-3 space-y-3 bg-pmr-content">
+          {documents.map((document) => (
+            <MobileDocumentCard
+              key={document.id}
+              document={document}
+              isExpanded={expandedId === document.id}
+              onToggle={() => handleToggle(document.id)}
+            />
+          ))}
+        </div>
+      ) : (
         <div className="overflow-x-auto">
           <table className="w-full border-collapse">
             <thead>
@@ -201,6 +309,7 @@ export function DocumentsView() {
             </tbody>
           </table>
         </div>
+      )}
       {documents.length === 0 && (
         <div className="p-4 text-sm text-gray-500 text-center">No documents attached</div>
       )}

src/components/views/InvestigationsView.tsx

@@ -2,6 +2,7 @@ import { useState, useEffect, useRef } from 'react'
 import { ChevronDown, ChevronUp, ExternalLink, Circle } from 'lucide-react'
 import { investigations } from '@/data/investigations'
 import type { Investigation } from '@/types/pmr'
+import { useBreakpoint } from '@/hooks/useBreakpoint'
 
 type InvestigationStatus = 'Complete' | 'Ongoing' | 'Live'
 
@@ -151,7 +152,7 @@ function InvestigationRow({
                     target="_blank"
                     rel="noopener noreferrer"
                     onClick={(e) => e.stopPropagation()}
-                    className="inline-flex items-center gap-2 px-4 py-2 bg-nhsblue text-white text-sm font-medium rounded hover:bg-blue-700 transition-colors"
+                    className="inline-flex items-center gap-2 px-4 py-2 bg-pmr-nhsblue text-white text-sm font-medium rounded hover:bg-blue-700 transition-colors"
                   >
                     View Results
                     <ExternalLink className="w-4 h-4" />
@@ -166,15 +167,120 @@ function InvestigationRow({
   )
 }
 
+function MobileInvestigationCard({
+  investigation,
+  isExpanded,
+  onToggle,
+}: {
+  investigation: Investigation
+  isExpanded: boolean
+  onToggle: () => void
+}) {
+  return (
+    <div className="bg-white border border-gray-200 rounded">
+      <button
+        type="button"
+        onClick={onToggle}
+        className="w-full p-4 text-left"
+        aria-expanded={isExpanded}
+      >
+        <div className="flex items-start justify-between gap-3">
+          <div className="flex-1 min-w-0">
+            <h3 className="font-inter font-medium text-sm text-gray-900">
+              {investigation.name}
+            </h3>
+            <div className="flex items-center gap-3 mt-1.5 text-xs text-gray-500">
+              <span className="font-geist">{investigation.requestedYear}</span>
+              <span>•</span>
+              <StatusBadge status={investigation.status} />
+            </div>
+            <p className="text-xs text-gray-700 mt-2 line-clamp-2">
+              {investigation.resultSummary}
+            </p>
+          </div>
+          <div className="flex-shrink-0 mt-1">
+            {isExpanded ? (
+              <ChevronUp size={16} className="text-gray-400" />
+            ) : (
+              <ChevronDown size={16} className="text-gray-400" />
+            )}
+          </div>
+        </div>
+      </button>
+      {isExpanded && (
+        <div className="px-4 pb-4 border-t border-gray-100">
+          <div className="pt-3 font-mono text-xs text-gray-700 leading-relaxed space-y-2">
+            <div className="flex">
+              <span className="text-gray-400 w-28 shrink-0">Date Requested:</span>
+              <span>{investigation.requestedYear}</span>
+            </div>
+            <div className="flex">
+              <span className="text-gray-400 w-28 shrink-0">Date Reported:</span>
+              <span>{investigation.reportedYear ?? 'Pending'}</span>
+            </div>
+            <div className="flex">
+              <span className="text-gray-400 w-28 shrink-0">Status:</span>
+              <span>
+                {investigation.status}
+                {investigation.status === 'Live' && investigation.externalUrl && (
+                  <> — Live at {investigation.externalUrl.replace('https://', '')}</>
+                )}
+              </span>
+            </div>
+            <div className="flex">
+              <span className="text-gray-400 w-28 shrink-0">Clinician:</span>
+              <span>{investigation.requestingClinician}</span>
+            </div>
+            <div className="flex flex-col">
+              <span className="text-gray-400 w-28 shrink-0">Methodology:</span>
+              <span className="mt-1">{investigation.methodology}</span>
+            </div>
+            <div className="flex flex-col">
+              <span className="text-gray-400 w-28 shrink-0">Results:</span>
+              <ul className="mt-1 space-y-0.5">
+                {investigation.results.map((result, idx) => (
+                  <li key={idx} className="flex items-start gap-2">
+                    <span className="text-gray-300 mt-0.5">-</span>
+                    <span>{result}</span>
+                  </li>
+                ))}
+              </ul>
+            </div>
+            <div className="flex">
+              <span className="text-gray-400 w-28 shrink-0">Tech Stack:</span>
+              <span>{investigation.techStack.join(', ')}</span>
+            </div>
+          </div>
+          {investigation.externalUrl && (
+            <div className="mt-4">
+              <a
+                href={investigation.externalUrl}
+                target="_blank"
+                rel="noopener noreferrer"
+                onClick={(e) => e.stopPropagation()}
+                className="inline-flex items-center gap-2 px-4 py-2 bg-pmr-nhsblue text-white text-xs font-medium rounded hover:bg-blue-700 transition-colors"
+              >
+                View Results
+                <ExternalLink className="w-3 h-3" />
+              </a>
+            </div>
+          )}
+        </div>
+      )}
+    </div>
+  )
+}
+
 export function InvestigationsView() {
   const [expandedId, setExpandedId] = useState<string | null>(null)
+  const { isMobile } = useBreakpoint()
 
   const handleToggle = (id: string) => {
     setExpandedId(expandedId === id ? null : id)
   }
 
   return (
-    <div className="bg-white border border-gray-200 rounded">
+    <div className="bg-white border border-gray-200 rounded overflow-hidden">
       <div className="bg-gray-50 border-b border-gray-200 px-4 py-3">
         <h2 className="font-inter font-semibold text-sm uppercase tracking-wider text-gray-500">
           Investigation Results
@@ -183,6 +289,18 @@ export function InvestigationsView() {
           Projects presented as diagnostic investigations — tests that were ordered, performed, and returned results.
         </p>
       </div>
+      {isMobile ? (
+        <div className="p-3 space-y-3 bg-pmr-content">
+          {investigations.map((investigation) => (
+            <MobileInvestigationCard
+              key={investigation.id}
+              investigation={investigation}
+              isExpanded={expandedId === investigation.id}
+              onToggle={() => handleToggle(investigation.id)}
+            />
+          ))}
+        </div>
+      ) : (
         <div className="overflow-x-auto">
           <table className="w-full border-collapse">
             <thead>
@@ -231,6 +349,7 @@ export function InvestigationsView() {
             </tbody>
           </table>
         </div>
+      )}
       {investigations.length === 0 && (
         <div className="p-4 text-sm text-gray-500 text-center">No investigation results</div>
       )}

src/components/views/MedicationsView.tsx

@@ -2,6 +2,7 @@ import { useState, useMemo } from 'react'
 import { ChevronDown, ChevronUp, ArrowUpDown, ArrowUp, ArrowDown } from 'lucide-react'
 import { medications } from '@/data/medications'
 import type { Medication } from '@/types/pmr'
+import { useBreakpoint } from '@/hooks/useBreakpoint'
 
 type SortField = 'name' | 'dose' | 'frequency' | 'startYear' | 'status'
 type SortDirection = 'asc' | 'desc' | null
@@ -12,15 +13,16 @@ interface SortState {
 }
 
 const categoryTabs = [
-  { id: 'Active', label: 'Active Medications', description: 'Technical skills (daily use)' },
+  { id: 'Active', label: 'Active Medications', shortLabel: 'Active', description: 'Technical skills (daily use)' },
-  { id: 'Clinical', label: 'Clinical Medications', description: 'Healthcare domain skills' },
+  { id: 'Clinical', label: 'Clinical Medications', shortLabel: 'Clinical', description: 'Healthcare domain skills' },
-  { id: 'PRN', label: 'PRN (As Required)', description: 'Strategic & leadership skills' },
+  { id: 'PRN', label: 'PRN (As Required)', shortLabel: 'PRN', description: 'Strategic & leadership skills' },
 ] as const
 
 export function MedicationsView() {
   const [activeTab, setActiveTab] = useState<'Active' | 'Clinical' | 'PRN'>('Active')
   const [expandedRow, setExpandedRow] = useState<string | null>(null)
   const [sort, setSort] = useState<SortState>({ field: 'name', direction: null })
+  const { isMobile } = useBreakpoint()
 
   const prefersReducedMotion = typeof window !== 'undefined'
     ? window.matchMedia('(prefers-reduced-motion: reduce)').matches
@@ -117,16 +119,26 @@ export function MedicationsView() {
                 `}
               >
                 <span className={`font-inter font-medium text-sm ${activeTab === tab.id ? 'text-gray-900' : 'text-gray-600'}`}>
-                  {tab.label}
+                  {isMobile ? tab.shortLabel : tab.label}
                 </span>
+                {!isMobile && (
                   <span className="block font-inter text-xs text-gray-500 mt-0.5">
                     {tab.description}
                   </span>
+                )}
               </button>
             ))}
           </nav>
         </div>
 
+        {isMobile ? (
+          <MobileMedicationList
+            medications={sortedMedications}
+            expandedRow={expandedRow}
+            onToggle={toggleRow}
+            prefersReducedMotion={prefersReducedMotion}
+          />
+        ) : (
           <div className="overflow-x-auto">
             <table className="w-full" role="grid">
               <thead>
@@ -208,10 +220,11 @@ export function MedicationsView() {
               </tbody>
             </table>
           </div>
+        )}
 
         <div className="px-4 py-3 border-t border-gray-200 bg-gray-50">
           <p className="font-inter text-xs text-gray-500">
-            {sortedMedications.length} medications in this category. Click a row to view prescribing history.
+            {sortedMedications.length} medications in this category. {isMobile ? 'Tap' : 'Click'} a row to view prescribing history.
           </p>
         </div>
       </div>
@@ -219,6 +232,80 @@ export function MedicationsView() {
   )
 }
 
+interface MobileMedicationListProps {
+  medications: Medication[]
+  expandedRow: string | null
+  onToggle: (id: string) => void
+  prefersReducedMotion: boolean
+}
+
+function MobileMedicationList({ medications, expandedRow, onToggle, prefersReducedMotion }: MobileMedicationListProps) {
+  const statusColors = {
+    'Active': 'bg-green-500',
+    'Historical': 'bg-gray-400',
+  }
+
+  return (
+    <div className="divide-y divide-gray-200">
+      {medications.map((med) => (
+        <div key={med.id} className="bg-white">
+          <button
+            type="button"
+            onClick={() => onToggle(med.id)}
+            className="w-full p-4 text-left"
+            aria-expanded={expandedRow === med.id}
+          >
+            <div className="flex items-start justify-between gap-3">
+              <div className="flex-1 min-w-0">
+                <h3 className="font-inter font-medium text-sm text-gray-900">
+                  {med.name}
+                </h3>
+                <div className="flex items-center gap-3 mt-1.5 text-xs text-gray-500">
+                  <span className="font-geist">{med.dose}%</span>
+                  <span>•</span>
+                  <span>{med.frequency}</span>
+                  <span>•</span>
+                  <span className="font-geist">Since {med.startYear}</span>
+                </div>
+              </div>
+              <div className="flex items-center gap-2 flex-shrink-0">
+                <span className={`w-2 h-2 rounded-full ${statusColors[med.status]}`} />
+                <span className="text-xs text-gray-600">{med.status}</span>
+                {expandedRow === med.id ? (
+                  <ChevronUp size={16} className="text-gray-400" />
+                ) : (
+                  <ChevronDown size={16} className="text-gray-400" />
+                )}
+              </div>
+            </div>
+          </button>
+          {expandedRow === med.id && (
+            <div className={`px-4 pb-4 ${prefersReducedMotion ? '' : 'animate-fadeIn'}`}>
+              <div className="bg-gray-50 rounded p-3">
+                <p className="font-inter font-medium text-xs uppercase tracking-wide text-gray-400 mb-2">
+                  Prescribing History
+                </p>
+                <div className="space-y-1.5">
+                  {med.prescribingHistory.map((entry, index) => (
+                    <div key={index} className="flex gap-3">
+                      <span className="font-geist font-medium text-xs text-gray-500 w-10 flex-shrink-0">
+                        {entry.year}
+                      </span>
+                      <span className="font-geist text-xs text-gray-600">
+                        {entry.description}
+                      </span>
+                    </div>
+                  ))}
+                </div>
+              </div>
+            </div>
+          )}
+        </div>
+      ))}
+    </div>
+  )
+}
+
 interface MedicationRowProps {
   medication: Medication
   isExpanded: boolean

src/components/views/ProblemsView.tsx

@@ -3,6 +3,7 @@ import { ChevronDown, ChevronUp, ExternalLink } from 'lucide-react'
 import { problems } from '@/data/problems'
 import { consultations } from '@/data/consultations'
 import type { Problem, Consultation } from '@/types/pmr'
+import { useBreakpoint } from '@/hooks/useBreakpoint'
 
 interface ProblemsViewProps {
   onNavigate?: (view: 'consultations', itemId?: string) => void
@@ -135,7 +136,7 @@ function ProblemRow({
                           e.stopPropagation()
                           handleLinkedClick(consultation.id)
                         }}
-                        className="inline-flex items-center gap-1 text-xs text-nhsblue hover:underline"
+                        className="inline-flex items-center gap-1 text-xs text-pmr-nhsblue hover:underline"
                       >
                         <ExternalLink className="w-3 h-3" />
                         {consultation.organization} — {consultation.role}
@@ -152,8 +153,101 @@ function ProblemRow({
   )
 }
 
+function MobileProblemCard({
+  problem,
+  isExpanded,
+  onToggle,
+  onNavigate,
+  showOutcome,
+}: {
+  problem: Problem
+  isExpanded: boolean
+  onToggle: () => void
+  onNavigate?: (view: 'consultations', itemId?: string) => void
+  showOutcome: boolean
+}) {
+  const linkedConsultations = (problem.linkedConsultations ?? [])
+    .map((id) => consultations.find((c) => c.id === id))
+    .filter((c): c is Consultation => c !== undefined)
+
+  const handleLinkedClick = (consultationId: string) => {
+    if (onNavigate) {
+      onNavigate('consultations', consultationId)
+    }
+  }
+
+  return (
+    <div className="bg-white border border-gray-200 rounded">
+      <button
+        type="button"
+        onClick={onToggle}
+        className="w-full p-4 text-left"
+        aria-expanded={isExpanded}
+      >
+        <div className="flex items-start justify-between gap-3">
+          <div className="flex-1 min-w-0">
+            <div className="flex items-center gap-2 mb-1">
+              <TrafficLight status={problem.status} />
+              <span className="font-mono text-xs text-gray-500">[{problem.code}]</span>
+            </div>
+            <h3 className="font-inter font-medium text-sm text-gray-900">
+              {problem.description}
+            </h3>
+            <div className="flex items-center gap-2 mt-1.5 text-xs text-gray-500">
+              <span>{showOutcome ? 'Resolved' : 'Since'}: {problem.resolved || problem.since}</span>
+              {showOutcome && problem.outcome && (
+                <>
+                  <span>•</span>
+                  <span className="text-gray-700">{problem.outcome}</span>
+                </>
+              )}
+            </div>
+          </div>
+          <div className="flex-shrink-0 mt-1">
+            {isExpanded ? (
+              <ChevronUp size={16} className="text-gray-400" />
+            ) : (
+              <ChevronDown size={16} className="text-gray-400" />
+            )}
+          </div>
+        </div>
+      </button>
+      {isExpanded && (
+        <div className="px-4 pb-4 border-t border-gray-100">
+          <div className="pt-3 text-sm text-gray-700 leading-relaxed">
+            {problem.narrative}
+          </div>
+          {linkedConsultations.length > 0 && (
+            <div className="mt-3">
+              <span className="text-xs font-semibold text-gray-400 uppercase tracking-wider">
+                Linked Consultations:
+              </span>
+              <div className="mt-2 flex flex-wrap gap-2">
+                {linkedConsultations.map((consultation) => (
+                  <button
+                    key={consultation.id}
+                    onClick={(e) => {
+                      e.stopPropagation()
+                      handleLinkedClick(consultation.id)
+                    }}
+                    className="inline-flex items-center gap-1 text-xs text-pmr-nhsblue hover:underline"
+                  >
+                    <ExternalLink className="w-3 h-3" />
+                    {consultation.organization}
+                  </button>
+                ))}
+              </div>
+            </div>
+          )}
+        </div>
+      )}
+    </div>
+  )
+}
+
 export function ProblemsView({ onNavigate }: ProblemsViewProps) {
   const [expandedId, setExpandedId] = useState<string | null>(null)
+  const { isMobile } = useBreakpoint()
 
   const activeProblems = problems.filter(
     (p) => p.status === 'Active' || p.status === 'In Progress'
@@ -166,12 +260,26 @@ export function ProblemsView({ onNavigate }: ProblemsViewProps) {
 
   return (
     <div className="space-y-6">
-      <div className="bg-white border border-gray-200 rounded">
+      <div className="bg-white border border-gray-200 rounded overflow-hidden">
         <div className="bg-gray-50 border-b border-gray-200 px-4 py-3">
           <h2 className="font-inter font-semibold text-sm uppercase tracking-wider text-gray-500">
             Active Problems
           </h2>
         </div>
+        {isMobile ? (
+          <div className="p-3 space-y-3 bg-pmr-content">
+            {activeProblems.map((problem) => (
+              <MobileProblemCard
+                key={problem.id}
+                problem={problem}
+                isExpanded={expandedId === problem.id}
+                onToggle={() => handleToggle(problem.id)}
+                onNavigate={onNavigate}
+                showOutcome={false}
+              />
+            ))}
+          </div>
+        ) : (
           <table className="w-full border-collapse">
             <thead>
               <tr className="bg-gray-50">
@@ -220,17 +328,32 @@ export function ProblemsView({ onNavigate }: ProblemsViewProps) {
               ))}
             </tbody>
           </table>
+        )}
         {activeProblems.length === 0 && (
           <div className="p-4 text-sm text-gray-500 text-center">No active problems</div>
         )}
       </div>
 
-      <div className="bg-white border border-gray-200 rounded">
+      <div className="bg-white border border-gray-200 rounded overflow-hidden">
         <div className="bg-gray-50 border-b border-gray-200 px-4 py-3">
           <h2 className="font-inter font-semibold text-sm uppercase tracking-wider text-gray-500">
             Resolved Problems
           </h2>
         </div>
+        {isMobile ? (
+          <div className="p-3 space-y-3 bg-pmr-content">
+            {resolvedProblems.map((problem) => (
+              <MobileProblemCard
+                key={problem.id}
+                problem={problem}
+                isExpanded={expandedId === problem.id}
+                onToggle={() => handleToggle(problem.id)}
+                onNavigate={onNavigate}
+                showOutcome={true}
+              />
+            ))}
+          </div>
+        ) : (
           <table className="w-full border-collapse">
             <thead>
               <tr className="bg-gray-50">
@@ -285,6 +408,7 @@ export function ProblemsView({ onNavigate }: ProblemsViewProps) {
               ))}
             </tbody>
           </table>
+        )}
         {resolvedProblems.length === 0 && (
           <div className="p-4 text-sm text-gray-500 text-center">No resolved problems</div>
         )}

src/hooks/useBreakpoint.ts

@@ -0,0 +1,61 @@
+import { useState, useEffect } from 'react'
+
+type Breakpoint = 'mobile' | 'tablet' | 'desktop'
+
+interface BreakpointState {
+  breakpoint: Breakpoint
+  isMobile: boolean
+  isTablet: boolean
+  isDesktop: boolean
+}
+
+export function useBreakpoint(): BreakpointState {
+  const [state, setState] = useState<BreakpointState>(() => {
+    if (typeof window === 'undefined') {
+      return { breakpoint: 'desktop', isMobile: false, isTablet: false, isDesktop: true }
+    }
+    const width = window.innerWidth
+    if (width < 768) {
+      return { breakpoint: 'mobile', isMobile: true, isTablet: false, isDesktop: false }
+    }
+    if (width < 1024) {
+      return { breakpoint: 'tablet', isMobile: false, isTablet: true, isDesktop: false }
+    }
+    return { breakpoint: 'desktop', isMobile: false, isTablet: false, isDesktop: true }
+  })
+
+  useEffect(() => {
+    const handleResize = () => {
+      const width = window.innerWidth
+      let breakpoint: Breakpoint
+      let isMobile: boolean
+      let isTablet: boolean
+      let isDesktop: boolean
+
+      if (width < 768) {
+        breakpoint = 'mobile'
+        isMobile = true
+        isTablet = false
+        isDesktop = false
+      } else if (width < 1024) {
+        breakpoint = 'tablet'
+        isMobile = false
+        isTablet = true
+        isDesktop = false
+      } else {
+        breakpoint = 'desktop'
+        isMobile = false
+        isTablet = false
+        isDesktop = true
+      }
+
+      setState({ breakpoint, isMobile, isTablet, isDesktop })
+    }
+
+    handleResize()
+    window.addEventListener('resize', handleResize)
+    return () => window.removeEventListener('resize', handleResize)
+  }, [])
+
+  return state
+}