diff --git a/frontend/src/app/AppLayout.jsx b/frontend/src/app/AppLayout.jsx
index de62040..22d4d3a 100644
--- a/frontend/src/app/AppLayout.jsx
+++ b/frontend/src/app/AppLayout.jsx
@@ -38,6 +38,7 @@ export default function AppLayout() {
 
   return (
     <div id="app">
+      <a className="skip-link" href="#main-content">Skip to content</a>
       <Sidebar
         collapsed={collapsed}
         mobileOpen={navOpen}
diff --git a/frontend/src/app/Sidebar.jsx b/frontend/src/app/Sidebar.jsx
index b79370a..7aede97 100644
--- a/frontend/src/app/Sidebar.jsx
+++ b/frontend/src/app/Sidebar.jsx
@@ -34,7 +34,7 @@ export default function Sidebar({ collapsed, mobileOpen, onToggleCollapse, badge
         </button>
       </div>
 
-      <nav className="sidebar-nav">
+      <nav className="sidebar-nav" aria-label="Primary">
         {NAV_GROUPS.map((group) => {
           const items = visible.filter((r) => r.group === group)
           if (!items.length) return null
diff --git a/frontend/src/app/Topbar.jsx b/frontend/src/app/Topbar.jsx
index 3b7a8e1..1256fd2 100644
--- a/frontend/src/app/Topbar.jsx
+++ b/frontend/src/app/Topbar.jsx
@@ -137,11 +137,11 @@ export default function Topbar({ onOpenNav, searchRef }) {
                 <div className="notif-row"><div className="notif-text">No notifications yet.</div></div>
               )}
               {notifications.map((n) => (
-                <div
+                <button
                   key={n.id}
+                  type="button"
                   className={`notif-row${n.unread ? ' unread' : ''}`}
                   onClick={() => openNotif(n)}
-                  style={{ cursor: 'pointer' }}
                 >
                   <span className={`notif-icn ${n.color}`}><Icon name={n.icon} /></span>
                   <div className="notif-body">
@@ -149,7 +149,7 @@ export default function Topbar({ onOpenNav, searchRef }) {
                     {n.text && <div className="notif-text">{n.text}</div>}
                     <div className="notif-time">{n.time}</div>
                   </div>
-                </div>
+                </button>
               ))}
             </div>
             <div className="dropdown-foot">
diff --git a/frontend/src/styles/styles.css b/frontend/src/styles/styles.css
index d59ebeb..5f6d99c 100644
--- a/frontend/src/styles/styles.css
+++ b/frontend/src/styles/styles.css
@@ -511,7 +511,9 @@ table.data thead th, .rbac-matrix th, .cal-dow, .info-item .il,
 .dropdown-link.danger { color: var(--danger); }
 .dropdown-link.danger svg { color: var(--danger); }
 .link-btn { color: var(--primary); font-size: 12px; font-weight: 600; }
-.notif-row { display: flex; gap: 12px; padding: 12px 16px; border-bottom: 1px solid var(--border); cursor: pointer; transition: .12s; }
+/* Rendered as a <button> when clickable (keyboard-reachable); the global
+   button reset keeps the visuals, these two keep the layout. */
+.notif-row { display: flex; gap: 12px; padding: 12px 16px; border-bottom: 1px solid var(--border); cursor: pointer; transition: .12s; width: 100%; text-align: left; }
 .notif-row:hover { background: var(--bg-sunken); }
 .notif-row.unread { background: var(--primary-soft); }
 [data-theme="dark"] .notif-row.unread { background: var(--primary-soft); }
diff --git a/frontend/src/ui/DataTable.jsx b/frontend/src/ui/DataTable.jsx
index c3be4c4..645a201 100644
--- a/frontend/src/ui/DataTable.jsx
+++ b/frontend/src/ui/DataTable.jsx
@@ -103,39 +103,47 @@ export function Pagination({ from, to, total, page, pages, setPage, pageButtons
   )
 }
 
-export default function DataTable({ columns, rows, pageSize = 10, empty }) {
+/** The sortable <thead>, exported so useDataTable consumers with custom
+    tbody markup (Candidates' checkbox column) stop copying it verbatim. */
+export function DataTableHead({ columns, sort, toggleSort }) {
+  return (
+    <thead>
+      <tr>
+        {columns.map((c) => {
+          const isSorted = sort.key === c.key
+          const cls = [
+            c.sortable ? 'sortable' : '',
+            isSorted ? (sort.dir === 1 ? 'sorted-asc' : 'sorted-desc') : '',
+          ].filter(Boolean).join(' ')
+          return (
+            <th
+              key={c.key}
+              className={cls}
+              style={{ textAlign: c.align || 'left' }}
+              onClick={c.sortable ? () => toggleSort(c.key) : undefined}
+            >
+              {c.label}
+              {c.sortable && (
+                <span className="sort-ind">
+                  {isSorted ? (sort.dir === 1 ? '▲' : '▼') : '⇅'}
+                </span>
+              )}
+            </th>
+          )
+        })}
+      </tr>
+    </thead>
+  )
+}
+
+export default function DataTable({ columns, rows, pageSize = 10, empty, onRowClick }) {
   const t = useDataTable({ columns, rows, pageSize })
 
   return (
     <div className="dt">
       <div className="table-wrap">
         <table className="data">
-          <thead>
-            <tr>
-              {columns.map((c) => {
-                const isSorted = t.sort.key === c.key
-                const cls = [
-                  c.sortable ? 'sortable' : '',
-                  isSorted ? (t.sort.dir === 1 ? 'sorted-asc' : 'sorted-desc') : '',
-                ].filter(Boolean).join(' ')
-                return (
-                  <th
-                    key={c.key}
-                    className={cls}
-                    style={{ textAlign: c.align || 'left' }}
-                    onClick={c.sortable ? () => t.toggleSort(c.key) : undefined}
-                  >
-                    {c.label}
-                    {c.sortable && (
-                      <span className="sort-ind">
-                        {isSorted ? (t.sort.dir === 1 ? '▲' : '▼') : '⇅'}
-                      </span>
-                    )}
-                  </th>
-                )
-              })}
-            </tr>
-          </thead>
+          <DataTableHead columns={columns} sort={t.sort} toggleSort={t.toggleSort} />
           <tbody>
             {t.pageRows.length === 0 ? (
               <tr>
@@ -145,7 +153,15 @@ export default function DataTable({ columns, rows, pageSize = 10, empty }) {
               </tr>
             ) : (
               t.pageRows.map((row, i) => (
-                <tr key={row.id ?? i}>
+                <tr
+                  key={row.id ?? i}
+                  className={onRowClick ? 'row-click' : undefined}
+                  tabIndex={onRowClick ? 0 : undefined}
+                  onClick={onRowClick ? () => onRowClick(row) : undefined}
+                  onKeyDown={onRowClick ? (e) => {
+                    if (e.key === 'Enter' && e.target === e.currentTarget) onRowClick(row)
+                  } : undefined}
+                >
                   {columns.map((c) => (
                     <td key={c.key} style={{ textAlign: c.align || 'left' }}>
                       {c.render ? c.render(row) : (row[c.key] ?? '')}
diff --git a/frontend/src/ui/Dropdown.jsx b/frontend/src/ui/Dropdown.jsx
index 62407d2..9820e89 100644
--- a/frontend/src/ui/Dropdown.jsx
+++ b/frontend/src/ui/Dropdown.jsx
@@ -3,7 +3,7 @@
    js/app.js:200-215, including its "only one open at a time" behaviour.
    ============================================================ */
 
-import { createContext, useContext, useEffect, useId, useMemo, useRef, useState } from 'react'
+import { cloneElement, createContext, useContext, useEffect, useId, useMemo, useRef, useState } from 'react'
 
 const GroupContext = createContext(null)
 
@@ -43,9 +43,13 @@ export default function Dropdown({ trigger, children, className = '', panelClass
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [open])
 
+  // The trigger is a render prop returning a single button; stamp the
+  // disclosure ARIA on it here so no call site has to remember to.
+  const triggerNode = trigger({ open, toggle: () => setOpen(!open) })
+
   return (
     <div className={`dropdown ${open ? 'open' : ''} ${className}`} ref={ref}>
-      {trigger({ open, toggle: () => setOpen(!open) })}
+      {cloneElement(triggerNode, { 'aria-expanded': open, 'aria-haspopup': 'true' })}
       <div className={`dropdown-menu ${panelClassName}`}>{children}</div>
     </div>
   )
diff --git a/frontend/src/ui/PageHeader.jsx b/frontend/src/ui/PageHeader.jsx
new file mode 100644
index 0000000..4df3a94
--- /dev/null
+++ b/frontend/src/ui/PageHeader.jsx
@@ -0,0 +1,24 @@
+/* ============================================================
+   PageHeader.jsx — the one page-top pattern.
+
+   Every screen used to hand-write the same .page-head block, and the copies
+   drifted (a bare <h1> on Matching rendered in the wrong face entirely).
+   Emits the exact class structure the stylesheet already targets, so this is
+   markup dedup, not a redesign. `title`/`sub`/`actions` accept any node —
+   selects, buttons and status chips ride through unchanged.
+   ============================================================ */
+
+export default function PageHeader({ title, sub, crumb, actions }) {
+  return (
+    <>
+      {crumb && <div className="breadcrumb">{crumb}</div>}
+      <div className="page-head">
+        <div className="page-head-main">
+          <h1 className="page-title">{title}</h1>
+          {sub && <p className="page-sub">{sub}</p>}
+        </div>
+        {actions && <div className="page-head-actions">{actions}</div>}
+      </div>
+    </>
+  )
+}
diff --git a/frontend/src/ui/Tabs.jsx b/frontend/src/ui/Tabs.jsx
index e4a2283..2eb0764 100644
--- a/frontend/src/ui/Tabs.jsx
+++ b/frontend/src/ui/Tabs.jsx
@@ -6,24 +6,48 @@
    `.active`. One component replaces four ad-hoc implementations, and only the
    active pane is mounted — which also means a chart in a hidden pane no longer
    draws into a zero-width canvas.
+
+   ARIA: tabs are indexed (`{base}-tab-{i}` / `{base}-panel-{i}`) so ids stay
+   valid whatever the key strings contain. A controlled <Tabs> without a
+   TabPanel emits aria-controls ids that nothing renders — inert, not an
+   error. Arrow keys move selection (selection follows focus); the roving
+   tabindex keeps the strip a single Tab stop.
    ============================================================ */
 
 import { useId, useState } from 'react'
 
-export function Tabs({ tabs, value, onChange, className = 'tabs' }) {
-  const id = useId()
+export function Tabs({ tabs, value, onChange, className = 'tabs', idBase }) {
+  const autoId = useId()
+  const base = idBase ?? autoId
+  const activeIndex = Math.max(0, tabs.findIndex((t) => (t.key ?? t) === value))
+
+  function onKeyDown(e) {
+    let next = null
+    if (e.key === 'ArrowRight' || e.key === 'ArrowDown') next = (activeIndex + 1) % tabs.length
+    else if (e.key === 'ArrowLeft' || e.key === 'ArrowUp') next = (activeIndex - 1 + tabs.length) % tabs.length
+    else if (e.key === 'Home') next = 0
+    else if (e.key === 'End') next = tabs.length - 1
+    if (next === null) return
+    e.preventDefault()
+    const t = tabs[next]
+    onChange(t.key ?? t)
+    document.getElementById(`${base}-tab-${next}`)?.focus()
+  }
+
   return (
-    <div className={className} role="tablist">
-      {tabs.map((t) => {
+    <div className={className} role="tablist" onKeyDown={onKeyDown}>
+      {tabs.map((t, i) => {
         const key = t.key ?? t
         const label = t.label ?? t
         const active = key === value
         return (
           <button
             key={key}
-            id={`${id}-${key}`}
+            id={`${base}-tab-${i}`}
             role="tab"
             aria-selected={active}
+            aria-controls={`${base}-panel-${i}`}
+            tabIndex={active ? 0 : -1}
             className={`tab${active ? ' active' : ''}`}
             onClick={() => onChange(key)}
           >
@@ -37,12 +61,16 @@ export function Tabs({ tabs, value, onChange, className = 'tabs' }) {
 
 /** Uncontrolled convenience wrapper: <TabPanel tabs={[{key,label,render}]} /> */
 export default function TabPanel({ tabs, initial, className }) {
+  const base = useId()
   const [value, setValue] = useState(initial ?? tabs[0]?.key)
-  const active = tabs.find((t) => t.key === value) ?? tabs[0]
+  const activeIndex = Math.max(0, tabs.findIndex((t) => t.key === value))
+  const active = tabs[activeIndex] ?? tabs[0]
   return (
     <>
-      <Tabs tabs={tabs} value={value} onChange={setValue} className={className} />
-      <div role="tabpanel">{active?.render?.()}</div>
+      <Tabs tabs={tabs} value={value} onChange={setValue} className={className} idBase={base} />
+      <div role="tabpanel" id={`${base}-panel-${activeIndex}`} aria-labelledby={`${base}-tab-${activeIndex}`}>
+        {active?.render?.()}
+      </div>
     </>
   )
 }
diff --git a/frontend/src/ui/Toast.jsx b/frontend/src/ui/Toast.jsx
index 97835e8..df188cc 100644
--- a/frontend/src/ui/Toast.jsx
+++ b/frontend/src/ui/Toast.jsx
@@ -77,7 +77,7 @@ export default function ToastProvider({ children }) {
     <ToastContext.Provider value={value}>
       {children}
       {createPortal(
-        <div className="toast-root">
+        <div className="toast-root" role="status" aria-live="polite">
           {items.map((t) => {
             const cfg = CONFIG[t.type] || CONFIG.info
             return (
diff --git a/frontend/src/ui/primitives.jsx b/frontend/src/ui/primitives.jsx
index 76c8920..4e53ce4 100644
--- a/frontend/src/ui/primitives.jsx
+++ b/frontend/src/ui/primitives.jsx
@@ -43,6 +43,10 @@ export const STATUS_CLASS = {
   'Strong Hire': 'b-green', Hire: 'b-teal', 'Lean Hire': 'b-amber', 'No Hire': 'b-red',
 }
 
+// Shared task/candidate priority map — Dashboard and Tasks each used to
+// define an identical private copy.
+export const PRIORITY_CLASS = { High: 'b-red', Medium: 'b-amber', Low: 'b-gray' }
+
 export function Badge({ children, className }) {
   const cls = className || STATUS_CLASS[children] || 'b-gray'
   return <span className={`badge ${cls}`}>{children}</span>