audit pass 6: accessibility, ARIA, and keyboard fixes

- JS: fix checkbox/radio required validation using .checked not .value
- JS: guard _cpTrigger.focus() with document.contains() check
- JS: add arrow/Home/End key navigation to tab groups (WCAG 2.1)
- JS: clamp context menu left edge with Math.max(8, ...) to prevent off-screen
- JS: fix wizard _show() to removeAttribute aria-hidden on active step
- HTML: add role="region" + aria-label to notification panel
- HTML: convert Assigned To span+div to label+select with for/id association
- HTML: add role="article" tabindex="0" aria-label to all kanban cards
- HTML: remove aria-hidden="false" anti-pattern from wizard active step
- CSS/HTML/JS: replace aria-hidden="false" show-hook with :not([aria-hidden])
  so open state is represented by absent attribute rather than false value

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

base.css

@@ -1792,6 +1792,7 @@ select option:checked {
   transition: transform 0.2s ease, opacity 0.2s ease;
   box-shadow: var(--glow-cyan);
 }
+.lt-menu-btn:active { opacity: 0.7; }
 .lt-menu-btn:focus-visible { outline: 1px solid var(--accent-cyan); outline-offset: 2px; }
 .lt-menu-btn.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
 .lt-menu-btn.open span:nth-child(2) { opacity: 0; }
@@ -2472,7 +2473,9 @@ select option:checked {
   transform: translateX(-50%) translateY(4px);
 }
 [data-tooltip]:hover::before,
-[data-tooltip]:hover::after {
+[data-tooltip]:focus-visible::before,
+[data-tooltip]:hover::after,
+[data-tooltip]:focus-visible::after {
   opacity: 1;
   transform: translateX(-50%) translateY(0);
 }
@@ -2490,7 +2493,9 @@ select option:checked {
   transform: translateX(-50%) translateY(-4px);
 }
 [data-tooltip][data-tooltip-pos="bottom"]:hover::before,
-[data-tooltip][data-tooltip-pos="bottom"]:hover::after {
+[data-tooltip][data-tooltip-pos="bottom"]:focus-visible::before,
+[data-tooltip][data-tooltip-pos="bottom"]:hover::after,
+[data-tooltip][data-tooltip-pos="bottom"]:focus-visible::after {
   transform: translateX(-50%) translateY(0);
 }
 
@@ -2551,6 +2556,12 @@ select option:checked {
   box-shadow: var(--glow-orange);
   font-weight: 700;
 }
+.lt-page-btn:focus-visible {
+  outline: 2px solid var(--accent-cyan);
+  outline-offset: 1px;
+  border-color: var(--accent-cyan);
+  color: var(--accent-cyan);
+}
 .lt-page-btn:disabled,
 .lt-page-btn[aria-disabled="true"] {
   opacity: 0.35;
@@ -2583,7 +2594,8 @@ select option:checked {
   width: 100%;
   text-align: left;
 }
-.lt-accordion-header:hover { background: var(--bg-tertiary); color: var(--accent-cyan); }
+.lt-accordion-header:hover  { background: var(--bg-tertiary); color: var(--accent-cyan); }
+.lt-accordion-header:active { background: var(--bg-tertiary); opacity: 0.8; }
 .lt-accordion-header:focus-visible { outline: 2px solid var(--accent-cyan); outline-offset: -2px; }
 .lt-accordion-header[aria-expanded="true"] { color: var(--accent-orange); }
 .lt-accordion-icon {
@@ -2641,6 +2653,7 @@ select option:checked {
   transition: color 0.15s;
 }
 .lt-alert-close:hover { color: var(--accent-red); }
+.lt-alert-close:focus-visible { outline: 2px solid var(--accent-cyan); outline-offset: 2px; border-radius: 2px; }
 .lt-alert.dismissed { max-height: 0 !important; opacity: 0; padding-top: 0; padding-bottom: 0; pointer-events: none; }
 
 
@@ -2655,7 +2668,21 @@ select option:checked {
   font-family: var(--font-mono);
   font-size: 0.8rem;
 }
-.lt-toggle input { display: none; }
+/* Visually hidden but still keyboard-focusable */
+.lt-toggle input {
+  position: absolute;
+  opacity: 0;
+  width: 1px; height: 1px;
+  margin: -1px; padding: 0;
+  border: 0;
+  overflow: hidden;
+  clip-path: inset(50%);
+  white-space: nowrap;
+}
+.lt-toggle input:focus-visible ~ .lt-toggle-track {
+  outline: 2px solid var(--accent-cyan);
+  outline-offset: 2px;
+}
 .lt-toggle-track {
   width: 36px;
   height: 18px;
@@ -2909,6 +2936,7 @@ input[type="range"].lt-range::-moz-range-thumb {
   transition: all 0.15s;
 }
 .lt-code-copy:hover { border-color: var(--accent-cyan); color: var(--accent-cyan); }
+.lt-code-copy:focus-visible { outline: 2px solid var(--accent-cyan); outline-offset: 2px; }
 .lt-code-copy.copied { border-color: var(--accent-green); color: var(--accent-green); }
 .lt-code-block pre {
   margin: 0;
@@ -4275,6 +4303,7 @@ html[data-theme="light"] ::-webkit-scrollbar-thumb:hover { background: var(--acc
   white-space: nowrap;
 }
 .lt-context-menu-item:hover { background: var(--accent-cyan-dim); color: var(--accent-cyan); }
+.lt-context-menu-item:focus-visible { outline: 2px solid var(--accent-cyan); outline-offset: -2px; background: var(--accent-cyan-dim); color: var(--accent-cyan); }
 .lt-context-menu-item.is-danger:hover { background: var(--accent-red-dim); color: var(--accent-red); }
 .lt-context-menu-item .icon { width: 1rem; text-align: center; opacity: 0.7; font-size: 0.75rem; }
 .lt-context-menu-item kbd {
@@ -4900,6 +4929,9 @@ body.lt-is-offline .lt-main { margin-top: 2rem; transition: margin-top 0.25s eas
 .lt-lightbox-close:hover,
 .lt-lightbox-prev:hover,
 .lt-lightbox-next:hover { color: var(--accent-cyan); border-color: var(--accent-cyan-border); box-shadow: var(--box-glow-cyan); }
+.lt-lightbox-close:focus-visible,
+.lt-lightbox-prev:focus-visible,
+.lt-lightbox-next:focus-visible { outline: 2px solid var(--accent-cyan); outline-offset: 2px; color: var(--accent-cyan); }
 .lt-lightbox-caption {
   position: fixed;
   bottom: 3rem;
@@ -4947,6 +4979,7 @@ body.lt-is-offline .lt-main { margin-top: 2rem; transition: margin-top 0.25s eas
   border-radius: 2px;
 }
 .lt-sidebar-group-label:hover { color: var(--text-secondary); }
+.lt-sidebar-group-label:focus-visible { outline: 2px solid var(--accent-cyan); outline-offset: 1px; border-radius: 2px; }
 .lt-sidebar-group-label .chevron {
   font-size: 0.5rem;
   transition: transform 0.2s ease;
@@ -5066,7 +5099,7 @@ body.lt-is-offline .lt-main { margin-top: 2rem; transition: margin-top 0.25s eas
   transition: opacity 0.15s ease, transform 0.15s ease;
   overflow: hidden;
 }
-.lt-notif-panel[aria-hidden="false"] {
+.lt-notif-panel:not([aria-hidden]) {
   opacity: 1;
   transform: scale(1);
   pointer-events: auto;
@@ -5111,6 +5144,7 @@ body.lt-is-offline .lt-main { margin-top: 2rem; transition: margin-top 0.25s eas
   transition: background 0.1s;
 }
 .lt-notif-item:hover { background: var(--bg-tertiary); }
+.lt-notif-item:focus-visible { outline: 2px solid var(--accent-cyan); outline-offset: -2px; background: var(--bg-tertiary); }
 .lt-notif-item--unread { background: rgba(0, 212, 255, 0.04); }
 
 .lt-notif-dot {
@@ -5179,7 +5213,7 @@ body.lt-is-offline .lt-main { margin-top: 2rem; transition: margin-top 0.25s eas
   right: 0;
   transform-origin: top right;
 }
-.lt-dropdown-panel[aria-hidden="false"] {
+.lt-dropdown-panel:not([aria-hidden]) {
   opacity: 1;
   transform: scale(1);
   pointer-events: auto;
@@ -5206,6 +5240,12 @@ body.lt-is-offline .lt-main { margin-top: 2rem; transition: margin-top 0.25s eas
   background: var(--bg-tertiary);
   color: var(--text-primary);
 }
+.lt-dropdown-item:focus-visible {
+  outline: 2px solid var(--accent-cyan);
+  outline-offset: -2px;
+  background: var(--bg-tertiary);
+  color: var(--text-primary);
+}
 .lt-dropdown-item--danger { color: var(--accent-red); }
 .lt-dropdown-item--danger:hover { background: rgba(255,45,85,0.1); color: var(--accent-red); }
 

base.html

@@ -123,34 +123,34 @@
       <!-- Notifications with badge + dropdown -->
       <div class="lt-notif-dropdown-wrap" id="lt-notif-bell">
         <button class="lt-btn lt-btn-sm lt-notif-bell-btn" id="lt-notif-bell-btn" aria-label="Open notifications" aria-expanded="false" aria-haspopup="true" style="padding:0 0.6rem;">🔔</button>
-        <div class="lt-notif-panel" id="lt-notif-panel" aria-hidden="true">
+        <div class="lt-notif-panel" id="lt-notif-panel" role="region" aria-label="Notifications" aria-hidden="true">
           <div class="lt-notif-panel-header">
             <span>Notifications</span>
             <button class="lt-notif-panel-clear" id="lt-notif-clear-all">Mark all read</button>
           </div>
           <div class="lt-notif-panel-list">
-            <div class="lt-notif-item lt-notif-item--unread">
+            <div class="lt-notif-item lt-notif-item--unread" role="button" tabindex="0">
               <span class="lt-notif-dot"></span>
               <div class="lt-notif-item-body">
                 <div class="lt-notif-item-title">P1 alert: storage link-down</div>
                 <div class="lt-notif-item-time">5 min ago</div>
               </div>
             </div>
-            <div class="lt-notif-item lt-notif-item--unread">
+            <div class="lt-notif-item lt-notif-item--unread" role="button" tabindex="0">
               <span class="lt-notif-dot"></span>
               <div class="lt-notif-item-body">
                 <div class="lt-notif-item-title">Worker node-03 reconnected</div>
                 <div class="lt-notif-item-time">12 min ago</div>
               </div>
             </div>
-            <div class="lt-notif-item lt-notif-item--unread">
+            <div class="lt-notif-item lt-notif-item--unread" role="button" tabindex="0">
               <span class="lt-notif-dot"></span>
               <div class="lt-notif-item-body">
                 <div class="lt-notif-item-title">Export CSV complete — 42 rows</div>
                 <div class="lt-notif-item-time">1 hr ago</div>
               </div>
             </div>
-            <div class="lt-notif-item">
+            <div class="lt-notif-item" role="button" tabindex="0">
               <span class="lt-notif-dot lt-notif-dot--read"></span>
               <div class="lt-notif-item-body">
                 <div class="lt-notif-item-title">Scheduled maintenance completed</div>
@@ -359,9 +359,9 @@
           </fieldset>
 
           <div class="lt-filter-group">
-            <span class="lt-filter-label">Assigned To</span>
+            <label class="lt-filter-label" for="filter-assigned-to">Assigned To</label>
             <div class="lt-form-group">
-              <select class="lt-select lt-btn-sm">
+              <select class="lt-select lt-btn-sm" id="filter-assigned-to">
                 <option value="">All users</option>
                 <option>operator</option>
                 <option>admin</option>
@@ -559,19 +559,19 @@
               <div class="lt-section-header">Open</div>
               <div class="lt-section-body" id="kanban-col-open" style="min-height:60px">
 
-                <div class="lt-card lt-mb-md lt-row-p1">
+                <div class="lt-card lt-mb-md lt-row-p1" role="article" tabindex="0" aria-label="P1 — Storage array link-down, 5m ago, Unassigned">
                   <div class="lt-flex lt-flex-between lt-mb-md">
-                    <span class="lt-p1">P1</span>
+                    <span class="lt-p1" aria-hidden="true">P1</span>
-                    <span class="lt-dot lt-dot-up"></span>
+                    <span class="lt-dot lt-dot-up" aria-hidden="true"></span>
                   </div>
                   <div class="lt-text-sm">Storage array link-down</div>
                   <div class="lt-text-xs lt-text-muted lt-mt-sm">5m ago · Unassigned</div>
                 </div>
 
-                <div class="lt-card lt-row-p3">
+                <div class="lt-card lt-row-p3" role="article" tabindex="0" aria-label="P3 — Update node_exporter on micro1, 1d ago, operator">
                   <div class="lt-flex lt-flex-between lt-mb-md">
-                    <span class="lt-p3">P3</span>
+                    <span class="lt-p3" aria-hidden="true">P3</span>
-                    <span class="lt-dot lt-dot-up"></span>
+                    <span class="lt-dot lt-dot-up" aria-hidden="true"></span>
                   </div>
                   <div class="lt-text-sm">Update node_exporter on micro1</div>
                   <div class="lt-text-xs lt-text-muted lt-mt-sm">1d ago · operator</div>
@@ -586,10 +586,10 @@
               <span class="lt-frame-br">╝</span>
               <div class="lt-section-header">Pending</div>
               <div class="lt-section-body" id="kanban-col-pending" style="min-height:60px">
-                <div class="lt-card lt-row-p2">
+                <div class="lt-card lt-row-p2" role="article" tabindex="0" aria-label="P2 — Scheduled maintenance window, 2d ago, admin">
                   <div class="lt-flex lt-flex-between lt-mb-md">
-                    <span class="lt-p2">P2</span>
+                    <span class="lt-p2" aria-hidden="true">P2</span>
-                    <span class="lt-dot lt-dot-warn"></span>
+                    <span class="lt-dot lt-dot-warn" aria-hidden="true"></span>
                   </div>
                   <div class="lt-text-sm">Scheduled maintenance window</div>
                   <div class="lt-text-xs lt-text-muted lt-mt-sm">2d ago · admin</div>
@@ -603,10 +603,10 @@
               <span class="lt-frame-br">╝</span>
               <div class="lt-section-header">In Progress</div>
               <div class="lt-section-body" id="kanban-col-inprogress" style="min-height:60px">
-                <div class="lt-card lt-row-p2 lt-item-running">
+                <div class="lt-card lt-row-p2 lt-item-running" role="article" tabindex="0" aria-label="P2 — Switch port flapping on USW-Pro, 2h ago, operator">
                   <div class="lt-flex lt-flex-between lt-mb-md">
-                    <span class="lt-p2">P2</span>
+                    <span class="lt-p2" aria-hidden="true">P2</span>
-                    <span class="lt-dot lt-dot-warn"></span>
+                    <span class="lt-dot lt-dot-warn" aria-hidden="true"></span>
                   </div>
                   <div class="lt-text-sm">Switch port flapping on USW-Pro</div>
                   <div class="lt-text-xs lt-text-muted lt-mt-sm">2h ago · operator</div>
@@ -620,10 +620,10 @@
               <span class="lt-frame-br">╝</span>
               <div class="lt-section-header">Closed</div>
               <div class="lt-section-body" id="kanban-col-closed" style="min-height:60px">
-                <div class="lt-card lt-row-p4" style="opacity:0.6">
+                <div class="lt-card lt-row-p4" style="opacity:0.6" role="article" tabindex="0" aria-label="P4 — Update SSL cert on wiki, 3d ago, operator">
                   <div class="lt-flex lt-flex-between lt-mb-md">
-                    <span class="lt-p4">P4</span>
+                    <span class="lt-p4" aria-hidden="true">P4</span>
-                    <span class="lt-dot lt-dot-idle"></span>
+                    <span class="lt-dot lt-dot-idle" aria-hidden="true"></span>
                   </div>
                   <div class="lt-text-sm">Update SSL cert on wiki</div>
                   <div class="lt-text-xs lt-text-muted lt-mt-sm">3d ago · operator</div>
@@ -1418,7 +1418,7 @@
           <!-- Counter -->
           <p class="lt-wizard-counter">Step <strong data-wizard-current>1</strong> of <strong data-wizard-total>3</strong></p>
           <!-- Steps -->
-          <div data-wizard-step="1" class="is-active" aria-hidden="false">
+          <div data-wizard-step="1" class="is-active">
             <div class="lt-grid lt-grid-2" style="gap:1rem;margin-top:1rem">
               <div class="lt-form-group"><label class="lt-label">Ticket Title</label><input type="text" name="title" class="lt-input lt-w-full" placeholder="Brief description…"></div>
               <div class="lt-form-group"><label class="lt-label">Priority</label><select name="priority" class="lt-select lt-w-full"><option value="p1">P1 Critical</option><option value="p2">P2 High</option><option value="p3" selected>P3 Medium</option><option value="p4">P4 Low</option></select></div>
@@ -1876,7 +1876,7 @@ Storage array link-down on `compute-storage-01`.
         if (!btn || !panel) return;
 
         function open() {
-          panel.setAttribute('aria-hidden', 'false');
+          panel.removeAttribute('aria-hidden');
           btn.setAttribute('aria-expanded', 'true');
           // Mark all as read visually
         }
@@ -1887,7 +1887,7 @@ Storage array link-down on `compute-storage-01`.
 
         btn.addEventListener('click', e => {
           e.stopPropagation();
-          panel.getAttribute('aria-hidden') === 'false' ? close() : open();
+          panel.hasAttribute('aria-hidden') ? open() : close();
         });
 
         // "Mark all read" button
@@ -1899,14 +1899,16 @@ Storage array link-down on `compute-storage-01`.
           lt.toast.info('All notifications marked as read');
         });
 
-        // Individual item click
+        // Individual item click + keyboard activation
         panel.querySelectorAll('.lt-notif-item').forEach(item => {
-          item.addEventListener('click', () => {
+          const activate = () => {
             item.classList.remove('lt-notif-item--unread');
             const dot = item.querySelector('.lt-notif-dot');
             if (dot) { dot.classList.add('lt-notif-dot--read'); }
             close();
-          });
+          };
+          item.addEventListener('click', activate);
+          item.addEventListener('keydown', e => { if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); activate(); } });
         });
 
         // Close on outside click
@@ -1926,15 +1928,15 @@ Storage array link-down on `compute-storage-01`.
 
         btn.addEventListener('click', e => {
           e.stopPropagation();
-          const isOpen = panel.getAttribute('aria-hidden') === 'false';
+          const isOpen = !panel.hasAttribute('aria-hidden');
           // Close all other dropdowns first
-          document.querySelectorAll('.lt-dropdown-panel[aria-hidden="false"]').forEach(p => {
+          document.querySelectorAll('.lt-dropdown-panel:not([aria-hidden])').forEach(p => {
             p.setAttribute('aria-hidden', 'true');
             const t = p.closest('.lt-dropdown-wrap').querySelector('.lt-dropdown-trigger');
             if (t) t.setAttribute('aria-expanded', 'false');
           });
           if (!isOpen) {
-            panel.setAttribute('aria-hidden', 'false');
+            panel.removeAttribute('aria-hidden');
             btn.setAttribute('aria-expanded', 'true');
           }
         });
@@ -1942,7 +1944,7 @@ Storage array link-down on `compute-storage-01`.
 
       // Close dropdowns on outside click / Esc
       document.addEventListener('click', () => {
-        document.querySelectorAll('.lt-dropdown-panel[aria-hidden="false"]').forEach(p => {
+        document.querySelectorAll('.lt-dropdown-panel:not([aria-hidden])').forEach(p => {
           p.setAttribute('aria-hidden', 'true');
           const t = p.closest('.lt-dropdown-wrap').querySelector('.lt-dropdown-trigger');
           if (t) t.setAttribute('aria-expanded', 'false');

base.js

@@ -282,8 +282,19 @@
       const saved = localStorage.getItem('lt_activeTab_' + location.pathname);
       if (saved && document.getElementById(saved)) { switchTab(saved); }
     } catch (_) {}
-    document.querySelectorAll('.lt-tab[data-tab]').forEach(btn => {
+    document.querySelectorAll('[role="tablist"]').forEach(tablist => {
-      btn.addEventListener('click', () => switchTab(btn.dataset.tab));
+      const btns = Array.from(tablist.querySelectorAll('.lt-tab[data-tab]'));
+      btns.forEach((btn, i) => {
+        btn.addEventListener('click', () => switchTab(btn.dataset.tab));
+        btn.addEventListener('keydown', e => {
+          let idx = -1;
+          if (e.key === 'ArrowRight') idx = (i + 1) % btns.length;
+          else if (e.key === 'ArrowLeft') idx = (i - 1 + btns.length) % btns.length;
+          else if (e.key === 'Home') idx = 0;
+          else if (e.key === 'End') idx = btns.length - 1;
+          if (idx >= 0) { e.preventDefault(); btns[idx].focus(); switchTab(btns[idx].dataset.tab); }
+        });
+      });
     });
   }
 
@@ -849,7 +860,7 @@
     const ov = document.getElementById('lt-cmd-overlay'); if (!ov) return;
     ov.classList.remove('is-open');
     _unlockScroll();
-    if (_cpTrigger) { _cpTrigger.focus(); _cpTrigger = null; }
+    if (_cpTrigger) { if (document.contains(_cpTrigger)) _cpTrigger.focus(); _cpTrigger = null; }
   }
 
   function _cpHighlight(text, q) {
@@ -970,6 +981,7 @@
 
   function _validateField(el) {
     const val = el.value || '', type = (el.type || '').toLowerCase();
+    if ((type === 'checkbox' || type === 'radio') && el.required && !el.checked) return { valid: false, message: 'This field is required' };
     if (el.required && !val.trim())                                             return { valid: false, message: 'This field is required' };
     if (el.minLength > 0 && val.length < el.minLength)                         return { valid: false, message: 'Minimum ' + el.minLength + ' characters' };
     if (el.maxLength > 0 && val.length > el.maxLength)                         return { valid: false, message: 'Maximum ' + el.maxLength + ' characters' };
@@ -1663,7 +1675,7 @@
     // Position — keep on screen
     const vw = window.innerWidth, vh = window.innerHeight;
     const mw = _ctxMenu.offsetWidth || 180, mh = _ctxMenu.offsetHeight || 200;
-    _ctxMenu.style.left = Math.min(x, vw - mw - 8) + 'px';
+    _ctxMenu.style.left = Math.max(8, Math.min(x, vw - mw - 8)) + 'px';
     _ctxMenu.style.top  = Math.min(y, vh - mh - 8) + 'px';
     // Focus first item
     const first = _ctxMenu.querySelector('[role="menuitem"]');
@@ -2110,7 +2122,11 @@
       group._sbInit = true;
       const label = group.querySelector('.lt-sidebar-group-label');
       if (!label) return;
-      label.addEventListener('click', () => group.classList.toggle('is-open'));
+      label.setAttribute('tabindex', '0');
+      label.setAttribute('role', 'button');
+      const _toggle = () => group.classList.toggle('is-open');
+      label.addEventListener('click', _toggle);
+      label.addEventListener('keydown', e => { if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); _toggle(); } });
       // Open group if it contains the active link
       if (group.querySelector('.lt-sidebar-sub-link.active, .lt-sidebar-sub-link[aria-current="page"]')) {
         group.classList.add('is-open');
@@ -2210,7 +2226,7 @@
       function _show(idx) {
         steps.forEach((s, i) => {
           s.classList.toggle('is-active', i === idx);
-          s.setAttribute('aria-hidden', i !== idx ? 'true' : 'false');
+          if (i !== idx) s.setAttribute('aria-hidden', 'true'); else s.removeAttribute('aria-hidden');
         });
         // Update step indicators
         container.querySelectorAll('[data-wizard-indicator]').forEach((ind, i) => {