diff --git a/assets/css/dashboard.css b/assets/css/dashboard.css
index ff80eef..0e95408 100644
--- a/assets/css/dashboard.css
+++ b/assets/css/dashboard.css
@@ -201,6 +201,19 @@ select:focus {
     outline-offset: 2px;
 }
 
+/* Screen reader only - visually hidden but accessible */
+.sr-only {
+    position: absolute;
+    width: 1px;
+    height: 1px;
+    padding: 0;
+    margin: -1px;
+    overflow: hidden;
+    clip: rect(0, 0, 0, 0);
+    white-space: nowrap;
+    border: 0;
+}
+
 /* Reduced motion for accessibility */
 @media (prefers-reduced-motion: reduce) {
     *,
diff --git a/assets/js/ticket.js b/assets/js/ticket.js
index dbbd415..16519ca 100644
--- a/assets/js/ticket.js
+++ b/assets/js/ticket.js
@@ -566,14 +566,17 @@ function showTab(tabName) {
         activityTab.style.display = 'none';
     }
 
-    // Remove active class from all buttons
+    // Remove active class and aria-selected from all buttons
     document.querySelectorAll('.tab-btn').forEach(btn => {
         btn.classList.remove('active');
+        btn.setAttribute('aria-selected', 'false');
     });
 
     // Show selected tab and activate its button
     document.getElementById(`${tabName}-tab`).style.display = 'block';
-    document.querySelector(`.tab-btn[data-tab="${tabName}"]`).classList.add('active');
+    const activeBtn = document.querySelector(`.tab-btn[data-tab="${tabName}"]`);
+    activeBtn.classList.add('active');
+    activeBtn.setAttribute('aria-selected', 'true');
 
     // Load attachments when tab is shown
     if (tabName === 'attachments') {
diff --git a/views/DashboardView.php b/views/DashboardView.php
index 30766a6..ef9dcf6 100644
--- a/views/DashboardView.php
+++ b/views/DashboardView.php
@@ -96,7 +96,7 @@ $nonce = SecurityHeadersMiddleware::getNonce();
                         </div>
                     </div>
                 <?php endif; ?>
-                <button class="settings-icon" title="Settings (Alt+S)" data-action="open-settings">⚙</button>
+                <button class="settings-icon" title="Settings (Alt+S)" data-action="open-settings" aria-label="Settings">⚙</button>
             <?php endif; ?>
         </div>
     </div>
@@ -284,8 +284,8 @@ $nonce = SecurityHeadersMiddleware::getNonce();
         <!-- Center: Actions + Count -->
         <div class="toolbar-center">
             <div class="view-toggle">
-                <button id="tableViewBtn" class="view-btn active" data-action="set-view-mode" data-mode="table" title="Table View">≡</button>
-                <button id="cardViewBtn" class="view-btn" data-action="set-view-mode" data-mode="card" title="Kanban View">▦</button>
+                <button id="tableViewBtn" class="view-btn active" data-action="set-view-mode" data-mode="table" title="Table View" aria-label="Table view" aria-pressed="true">≡</button>
+                <button id="cardViewBtn" class="view-btn" data-action="set-view-mode" data-mode="card" title="Kanban View" aria-label="Kanban view" aria-pressed="false">▦</button>
             </div>
             <button data-action="navigate" data-url="<?php echo $GLOBALS['config']['BASE_URL']; ?>/ticket/create" class="btn create-ticket">+ New Ticket</button>
             <div class="export-dropdown" id="exportDropdown" style="display: none;">
diff --git a/views/TicketView.php b/views/TicketView.php
index 1fdb3ff..e4f4b9d 100644
--- a/views/TicketView.php
+++ b/views/TicketView.php
@@ -87,7 +87,7 @@ $nonce = SecurityHeadersMiddleware::getNonce();
                 <?php if ($GLOBALS['currentUser']['is_admin']): ?>
                     <span class="admin-badge">Admin</span>
                 <?php endif; ?>
-                <button class="settings-icon" title="Settings (Alt+S)" id="settingsBtn">⚙</button>
+                <button class="settings-icon" title="Settings (Alt+S)" id="settingsBtn" aria-label="Settings">⚙</button>
             <?php endif; ?>
         </div>
     </div>
@@ -268,13 +268,13 @@ $nonce = SecurityHeadersMiddleware::getNonce();
         <!-- SECTION 2: Tab Navigation -->
         <div class="ascii-section-header">Content Sections</div>
         <div class="ascii-content">
-            <div class="ticket-tabs">
-                <button class="tab-btn active" data-tab="description">Description</button>
-                <button class="tab-btn" data-tab="comments">Comments</button>
-                <button class="tab-btn" data-tab="attachments">Attachments</button>
-                <button class="tab-btn" data-tab="dependencies">Dependencies</button>
-                <button class="tab-btn" data-tab="activity">Activity</button>
-            </div>
+            <nav class="ticket-tabs" role="tablist" aria-label="Ticket content sections">
+                <button class="tab-btn active" id="description-tab-btn" data-tab="description" role="tab" aria-selected="true" aria-controls="description-tab">Description</button>
+                <button class="tab-btn" id="comments-tab-btn" data-tab="comments" role="tab" aria-selected="false" aria-controls="comments-tab">Comments</button>
+                <button class="tab-btn" id="attachments-tab-btn" data-tab="attachments" role="tab" aria-selected="false" aria-controls="attachments-tab">Attachments</button>
+                <button class="tab-btn" id="dependencies-tab-btn" data-tab="dependencies" role="tab" aria-selected="false" aria-controls="dependencies-tab">Dependencies</button>
+                <button class="tab-btn" id="activity-tab-btn" data-tab="activity" role="tab" aria-selected="false" aria-controls="activity-tab">Activity</button>
+            </nav>
         </div>
 
         <!-- DIVIDER -->
@@ -285,7 +285,7 @@ $nonce = SecurityHeadersMiddleware::getNonce();
         <div class="ascii-content">
             <div class="ascii-frame-inner">
                 <div class="ticket-details">
-                    <div id="description-tab" class="tab-content active">
+                    <div id="description-tab" class="tab-content active" role="tabpanel" aria-labelledby="description-tab-btn">
                         <div class="ascii-subsection-header">Description</div>
                         <div class="detail-group full-width">
                             <label>Description</label>
@@ -293,13 +293,14 @@ $nonce = SecurityHeadersMiddleware::getNonce();
                         </div>
                     </div>
 
-                    <div id="comments-tab" class="tab-content">
+                    <div id="comments-tab" class="tab-content" role="tabpanel" aria-labelledby="comments-tab-btn">
                         <div class="ascii-subsection-header">Comments Section</div>
                         <div class="comments-section">
                             <div class="ascii-frame-inner">
                                 <h2>Add Comment</h2>
                                 <div class="comment-form">
-                        <textarea id="newComment" placeholder="Add a comment..."></textarea>
+                        <label for="newComment" class="sr-only">New comment</label>
+                        <textarea id="newComment" placeholder="Add a comment..." aria-label="Add a comment"></textarea>
                         <div class="comment-controls">
                             <div class="markdown-toggles">
                                 <div class="preview-toggle">
@@ -362,12 +363,12 @@ $nonce = SecurityHeadersMiddleware::getNonce();
                                         echo "<div class='comment-actions'>";
                                         // Reply button (max depth of 3)
                                         if ($threadDepth < 3) {
-                                            echo "<button type='button' class='comment-action-btn reply-btn' data-action='reply-comment' data-comment-id='{$commentId}' data-user=\"" . htmlspecialchars($displayName, ENT_QUOTES) . "\" title='Reply'>↩</button>";
+                                            echo "<button type='button' class='comment-action-btn reply-btn' data-action='reply-comment' data-comment-id='{$commentId}' data-user=\"" . htmlspecialchars($displayName, ENT_QUOTES) . "\" title='Reply' aria-label='Reply to comment'>↩</button>";
                                         }
                                         // Edit/Delete buttons for owner or admin
                                         if ($canModify) {
-                                            echo "<button type='button' class='comment-action-btn edit-btn' data-action='edit-comment' data-comment-id='{$commentId}' title='Edit'>✏️</button>";
-                                            echo "<button type='button' class='comment-action-btn delete-btn' data-action='delete-comment' data-comment-id='{$commentId}' title='Delete'>🗑️</button>";
+                                            echo "<button type='button' class='comment-action-btn edit-btn' data-action='edit-comment' data-comment-id='{$commentId}' title='Edit' aria-label='Edit comment'>✏️</button>";
+                                            echo "<button type='button' class='comment-action-btn delete-btn' data-action='delete-comment' data-comment-id='{$commentId}' title='Delete' aria-label='Delete comment'>🗑️</button>";
                                         }
                                         echo "</div>";
 
@@ -408,7 +409,7 @@ $nonce = SecurityHeadersMiddleware::getNonce();
                         </div>
                     </div>
 
-                    <div id="attachments-tab" class="tab-content">
+                    <div id="attachments-tab" class="tab-content" role="tabpanel" aria-labelledby="attachments-tab-btn">
                         <div class="ascii-subsection-header">File Attachments</div>
                         <div class="attachments-container">
                             <!-- Upload Form -->
@@ -419,7 +420,7 @@ $nonce = SecurityHeadersMiddleware::getNonce();
                                         <div class="upload-icon">📁</div>
                                         <p>Drag and drop files here or click to browse</p>
                                         <p class="upload-hint">Max file size: <?php echo $GLOBALS['config']['MAX_UPLOAD_SIZE'] ? number_format($GLOBALS['config']['MAX_UPLOAD_SIZE'] / 1048576, 0) . 'MB' : '10MB'; ?></p>
-                                        <input type="file" id="fileInput" multiple style="display: none;">
+                                        <input type="file" id="fileInput" multiple style="display: none;" aria-label="Upload files">
                                         <button type="button" id="browseFilesBtn" class="btn" style="margin-top: 1rem;">Browse Files</button>
                                     </div>
                                 </div>
@@ -441,16 +442,18 @@ $nonce = SecurityHeadersMiddleware::getNonce();
                         </div>
                     </div>
 
-                    <div id="dependencies-tab" class="tab-content">
+                    <div id="dependencies-tab" class="tab-content" role="tabpanel" aria-labelledby="dependencies-tab-btn">
                         <div class="ascii-subsection-header">Ticket Dependencies</div>
                         <div class="dependencies-container">
                             <!-- Add Dependency Form -->
                             <div class="ascii-frame-inner" style="margin-bottom: 1rem;">
                                 <h3>Add Dependency</h3>
                                 <div class="add-dependency-form" style="display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: center;">
-                                    <input type="text" id="dependencyTicketId" placeholder="Ticket ID (e.g., 123456789)"
+                                    <label for="dependencyTicketId" class="sr-only">Ticket ID for dependency</label>
+                                    <input type="text" id="dependencyTicketId" placeholder="Ticket ID (e.g., 123456789)" aria-label="Ticket ID for dependency"
                                         style="flex: 1; min-width: 150px; padding: 0.5rem; border: 2px solid var(--terminal-green); background: var(--bg-primary); color: var(--terminal-green); font-family: var(--font-mono);">
-                                    <select id="dependencyType" style="padding: 0.5rem; border: 2px solid var(--terminal-green); background: var(--bg-primary); color: var(--terminal-green); font-family: var(--font-mono);">
+                                    <label for="dependencyType" class="sr-only">Dependency type</label>
+                                    <select id="dependencyType" aria-label="Dependency type" style="padding: 0.5rem; border: 2px solid var(--terminal-green); background: var(--bg-primary); color: var(--terminal-green); font-family: var(--font-mono);">
                                         <option value="blocks">Blocks</option>
                                         <option value="blocked_by">Blocked By</option>
                                         <option value="relates_to">Relates To</option>
@@ -478,7 +481,7 @@ $nonce = SecurityHeadersMiddleware::getNonce();
                         </div>
                     </div>
 
-                    <div id="activity-tab" class="tab-content">
+                    <div id="activity-tab" class="tab-content" role="tabpanel" aria-labelledby="activity-tab-btn">
                         <div class="ascii-subsection-header">Activity Timeline</div>
                         <div class="timeline-container">
                             <?php if (empty($timeline)): ?>