diff --git a/src/components/card-detail/AttachmentSection.tsx b/src/components/card-detail/AttachmentSection.tsx
index 56af145..7af368e 100644
--- a/src/components/card-detail/AttachmentSection.tsx
+++ b/src/components/card-detail/AttachmentSection.tsx
@@ -52,6 +52,7 @@ export function AttachmentSection({
           size="icon-xs"
           onClick={handleAdd}
           className="text-pylon-text-secondary hover:text-pylon-text"
+          aria-label="Add attachment"
         >
           <Plus className="size-3.5" />
         </Button>
@@ -71,14 +72,14 @@ export function AttachmentSection({
               </span>
               <button
                 onClick={() => openPath(att.path)}
-                className="shrink-0 rounded p-0.5 text-pylon-text-secondary opacity-0 transition-opacity hover:bg-pylon-accent/10 hover:text-pylon-accent group-hover/att:opacity-100"
+                className="shrink-0 rounded p-0.5 text-pylon-text-secondary opacity-0 transition-opacity hover:bg-pylon-accent/10 hover:text-pylon-accent group-hover/att:opacity-100 focus-visible:opacity-100"
                 aria-label="Open attachment"
               >
                 <ExternalLink className="size-3" />
               </button>
               <button
                 onClick={() => removeAttachment(cardId, att.id)}
-                className="shrink-0 rounded p-0.5 text-pylon-text-secondary opacity-0 transition-opacity hover:bg-pylon-danger/10 hover:text-pylon-danger group-hover/att:opacity-100"
+                className="shrink-0 rounded p-0.5 text-pylon-text-secondary opacity-0 transition-opacity hover:bg-pylon-danger/10 hover:text-pylon-danger group-hover/att:opacity-100 focus-visible:opacity-100"
                 aria-label="Remove attachment"
               >
                 <X className="size-3" />
diff --git a/src/components/card-detail/ChecklistSection.tsx b/src/components/card-detail/ChecklistSection.tsx
index 10531bc..885d7b6 100644
--- a/src/components/card-detail/ChecklistSection.tsx
+++ b/src/components/card-detail/ChecklistSection.tsx
@@ -121,6 +121,7 @@ export function ChecklistSection({ cardId, checklist }: ChecklistSectionProps) {
           onChange={(e) => setNewItemText(e.target.value)}
           onKeyDown={handleKeyDown}
           placeholder="Add item..."
+          aria-label="New checklist item"
           className="h-7 flex-1 rounded-md bg-pylon-column px-2 text-sm text-pylon-text outline-none placeholder:text-pylon-text-secondary/60 focus:ring-1 focus:ring-pylon-accent"
         />
       </div>
@@ -176,7 +177,8 @@ function ChecklistRow({ item, onToggle, onUpdate, onDelete }: ChecklistRowProps)
       {...attributes}
     >
       <span
-        className="shrink-0 cursor-grab text-pylon-text-secondary opacity-0 group-hover/item:opacity-100"
+        className="shrink-0 cursor-grab text-pylon-text-secondary opacity-0 group-hover/item:opacity-100 focus-visible:opacity-100"
+        aria-label="Reorder item"
         {...listeners}
       >
         <GripVertical className="size-3" />
@@ -185,6 +187,7 @@ function ChecklistRow({ item, onToggle, onUpdate, onDelete }: ChecklistRowProps)
         type="checkbox"
         checked={item.checked}
         onChange={onToggle}
+        aria-label={`Mark "${item.text}" as ${item.checked ? "incomplete" : "complete"}`}
         className="size-3.5 shrink-0 cursor-pointer accent-pylon-accent"
       />
 
@@ -215,7 +218,7 @@ function ChecklistRow({ item, onToggle, onUpdate, onDelete }: ChecklistRowProps)
 
       <button
         onClick={onDelete}
-        className="shrink-0 rounded p-0.5 text-pylon-text-secondary opacity-0 transition-opacity hover:bg-pylon-danger/10 hover:text-pylon-danger group-hover/item:opacity-100"
+        className="shrink-0 rounded p-0.5 text-pylon-text-secondary opacity-0 transition-opacity hover:bg-pylon-danger/10 hover:text-pylon-danger group-hover/item:opacity-100 focus-visible:opacity-100"
         aria-label="Delete item"
       >
         <X className="size-3" />
diff --git a/src/components/card-detail/CommentsSection.tsx b/src/components/card-detail/CommentsSection.tsx
index ba7ffae..cb2a84b 100644
--- a/src/components/card-detail/CommentsSection.tsx
+++ b/src/components/card-detail/CommentsSection.tsx
@@ -47,6 +47,7 @@ export function CommentsSection({ cardId, comments }: CommentsSectionProps) {
           onKeyDown={handleKeyDown}
           placeholder="Add a comment... (Enter to send, Shift+Enter for newline)"
           rows={2}
+          aria-label="Add a comment"
           className="flex-1 resize-none rounded-md bg-pylon-column px-2 py-1.5 text-sm text-pylon-text outline-none placeholder:text-pylon-text-secondary/60 focus:ring-1 focus:ring-pylon-accent"
         />
         <Button
@@ -82,7 +83,7 @@ export function CommentsSection({ cardId, comments }: CommentsSectionProps) {
                 </div>
                 <button
                   onClick={() => deleteComment(cardId, comment.id)}
-                  className="shrink-0 self-start rounded p-0.5 text-pylon-text-secondary opacity-0 transition-opacity hover:bg-pylon-danger/10 hover:text-pylon-danger group-hover/comment:opacity-100"
+                  className="shrink-0 self-start rounded p-0.5 text-pylon-text-secondary opacity-0 transition-opacity hover:bg-pylon-danger/10 hover:text-pylon-danger group-hover/comment:opacity-100 focus-visible:opacity-100"
                   aria-label="Delete comment"
                 >
                   <X className="size-3" />
diff --git a/src/components/card-detail/LabelPicker.tsx b/src/components/card-detail/LabelPicker.tsx
index fe64368..d181897 100644
--- a/src/components/card-detail/LabelPicker.tsx
+++ b/src/components/card-detail/LabelPicker.tsx
@@ -70,6 +70,7 @@ export function LabelPicker({
               variant="ghost"
               size="icon-xs"
               className="text-pylon-text-secondary hover:text-pylon-text"
+              aria-label="Manage labels"
             >
               <Plus className="size-3.5" />
             </Button>
@@ -95,6 +96,8 @@ export function LabelPicker({
                           key={label.id}
                           onClick={() => toggleCardLabel(cardId, label.id)}
                           className="flex items-center gap-2 rounded px-2 py-1 text-left text-sm transition-colors hover:bg-pylon-column"
+                          aria-pressed={isSelected}
+                          aria-label={`${isSelected ? "Remove" : "Add"} label: ${label.name}`}
                         >
                           <span
                             className="size-3 shrink-0 rounded-full"
@@ -122,6 +125,7 @@ export function LabelPicker({
                     onChange={(e) => setNewLabelName(e.target.value)}
                     onKeyDown={handleCreateKeyDown}
                     placeholder="Label name..."
+                    aria-label="New label name"
                     className="h-7 rounded-md bg-pylon-column px-2 text-sm text-pylon-text outline-none placeholder:text-pylon-text-secondary/60 focus:ring-1 focus:ring-pylon-accent"
                   />
                   <div className="flex flex-wrap gap-1.5">
@@ -130,6 +134,7 @@ export function LabelPicker({
                         key={color}
                         onClick={() => setNewLabelColor(color)}
                         className="size-5 rounded-full transition-transform hover:scale-110"
+                        aria-label={`Color ${color}`}
                         style={{
                           backgroundColor: color,
                           outline:
diff --git a/src/components/card-detail/MarkdownEditor.tsx b/src/components/card-detail/MarkdownEditor.tsx
index c046bea..991c31d 100644
--- a/src/components/card-detail/MarkdownEditor.tsx
+++ b/src/components/card-detail/MarkdownEditor.tsx
@@ -76,6 +76,7 @@ export function MarkdownEditor({ cardId, value }: MarkdownEditorProps) {
           variant={mode === "edit" ? "secondary" : "ghost"}
           size="xs"
           onClick={() => setMode("edit")}
+          aria-pressed={mode === "edit"}
           className="font-mono text-xs"
         >
           Edit
@@ -83,6 +84,7 @@ export function MarkdownEditor({ cardId, value }: MarkdownEditorProps) {
         <Button
           variant={mode === "preview" ? "secondary" : "ghost"}
           size="xs"
+          aria-pressed={mode === "preview"}
           onClick={() => {
             // Save before switching to preview
             if (mode === "edit") {
@@ -113,6 +115,7 @@ export function MarkdownEditor({ cardId, value }: MarkdownEditorProps) {
             onChange={handleChange}
             onBlur={handleBlur}
             placeholder="Add a description... (Markdown supported)"
+            aria-label="Card description (Markdown)"
             className="min-h-[100px] w-full resize-none overflow-hidden bg-transparent px-3 py-2 text-sm text-pylon-text outline-none placeholder:text-pylon-text-secondary/60"
           />
         </OverlayScrollbarsComponent>
diff --git a/src/components/card-detail/PriorityPicker.tsx b/src/components/card-detail/PriorityPicker.tsx
index 3f34a15..6809abc 100644
--- a/src/components/card-detail/PriorityPicker.tsx
+++ b/src/components/card-detail/PriorityPicker.tsx
@@ -27,6 +27,7 @@ export function PriorityPicker({ cardId, priority }: PriorityPickerProps) {
           <button
             key={value}
             onClick={() => updateCard(cardId, { priority: value })}
+            aria-pressed={priority === value}
             className={`rounded-full px-3 py-1 text-xs font-medium transition-all ${
               priority === value
                 ? "text-white shadow-sm"