diff --git a/TASKS.md b/TASKS.md
index 9d60701..349401b 100644
--- a/TASKS.md
+++ b/TASKS.md
@@ -46,6 +46,13 @@ Verification:
 - manual mobile checks at 375px width;
 - EN/RU copy audit.
 
+Progress:
+- done:
+  - `API Keys` page now has a mobile card layout instead of relying only on desktop table presentation
+- pending:
+  - mobile card layouts for `Secrets` and `Usage`
+  - remaining `Agents` and `Settings` commercial UX polish
+
 ## Planned
 
 ### `feat/open-core-repo-boundary`
diff --git a/apps/ui/html/api-keys.html b/apps/ui/html/api-keys.html
index 646b193..e6b6b3e 100644
--- a/apps/ui/html/api-keys.html
+++ b/apps/ui/html/api-keys.html
@@ -22,6 +22,11 @@
   }
   .scope-checkbox-name { font-size: 13px; font-weight: 500; color: var(--text-primary); }
   .scope-checkbox-desc { font-size: 11.5px; color: var(--text-muted); }
+  .keys-card-list { display: none; }
+  @media (max-width: 720px) {
+    #keys-table-wrap { display: none; }
+    .keys-card-list { display: grid; }
+  }
   </style>
   <script src="%CRANK_BUNDLE_PROTECTED_CORE%"></script>
 </head>
@@ -195,6 +200,7 @@
           </tbody>
         </table>
       </div>
+      <div class="resource-list keys-card-list" id="keys-card-list"></div>
     </div>
 
     <div class="section-card">
diff --git a/apps/ui/js/api-keys.js b/apps/ui/js/api-keys.js
index 6f31241..b3d1ccd 100644
--- a/apps/ui/js/api-keys.js
+++ b/apps/ui/js/api-keys.js
@@ -291,12 +291,16 @@ function renderScopes() {
 function renderTable(errorMessage) {
   var q = search.toLowerCase();
   var tbody = document.getElementById('keys-tbody');
+  var cardList = document.getElementById('keys-card-list');
   var rows = KEYS.filter(function(key) {
     return !q || key.name.toLowerCase().includes(q) || key.prefix.toLowerCase().includes(q);
   });
   var subtitle = document.getElementById('keys-summary-subtitle');
 
   tbody.innerHTML = '';
+  if (cardList) {
+    cardList.innerHTML = '';
+  }
 
   if (subtitle) {
     var active = KEYS.filter(function(key) { return key.status === 'active'; }).length;
@@ -314,6 +318,7 @@ function renderTable(errorMessage) {
     errorCell.textContent = errorMessage;
     errorRow.appendChild(errorCell);
     tbody.appendChild(errorRow);
+    renderKeyCards([], errorMessage);
     return;
   }
 
@@ -327,6 +332,7 @@ function renderTable(errorMessage) {
       : tKey('apikeys.agent.empty_hint');
     empty.appendChild(td);
     tbody.appendChild(empty);
+    renderKeyCards(rows);
     return;
   }
 
@@ -370,6 +376,121 @@ function renderTable(errorMessage) {
 
     tbody.appendChild(node);
   });
+
+  renderKeyCards(rows);
+}
+
+function renderKeyCards(rows, errorMessage) {
+  var cardList = document.getElementById('keys-card-list');
+  if (!cardList) return;
+
+  cardList.innerHTML = '';
+
+  if (errorMessage) {
+    cardList.appendChild(buildKeyCardMessage(errorMessage, true));
+    return;
+  }
+
+  if (!rows.length) {
+    cardList.appendChild(
+      buildKeyCardMessage(
+        currentAgentId
+          ? (KEYS.length ? tKey('apikeys.empty.search') : tKey('apikeys.empty.none'))
+          : tKey('apikeys.agent.empty_hint'),
+        false
+      )
+    );
+    return;
+  }
+
+  rows.forEach(function(key) {
+    var card = document.createElement('div');
+    card.className = 'resource-card';
+
+    var header = document.createElement('div');
+    header.className = 'resource-card-header';
+    var headerMain = document.createElement('div');
+    var title = document.createElement('div');
+    title.className = 'resource-card-title';
+    title.textContent = key.name;
+    var subtitle = document.createElement('div');
+    subtitle.className = 'resource-card-subtitle';
+    subtitle.textContent = key.prefix;
+    headerMain.appendChild(title);
+    headerMain.appendChild(subtitle);
+
+    var actions = document.createElement('div');
+    actions.className = 'resource-card-actions';
+
+    var statusBadge = document.createElement('span');
+    statusBadge.className = key.status === 'active' ? 'badge badge-active' : 'badge badge-revoked';
+    statusBadge.textContent = key.status === 'active'
+      ? tKey('apikeys.status.active')
+      : tKey('apikeys.status.revoked');
+    actions.appendChild(statusBadge);
+    header.appendChild(headerMain);
+    header.appendChild(actions);
+    card.appendChild(header);
+
+    var metaGrid = document.createElement('div');
+    metaGrid.className = 'resource-meta-grid';
+    metaGrid.appendChild(buildMetaItem('apikeys.th.scopes', key.scopes.join(', ') || '—'));
+    metaGrid.appendChild(buildMetaItem('apikeys.th.created', key.created));
+    metaGrid.appendChild(buildMetaItem('apikeys.th.last', key.lastUsed));
+    card.appendChild(metaGrid);
+
+    var actionRow = document.createElement('div');
+    actionRow.className = 'resource-card-actions';
+    if (key.status === 'active') {
+      actionRow.appendChild(buildCardAction('apikeys.action.copy_prefix', function() {
+        copyPrefix(key.prefix);
+      }));
+      actionRow.appendChild(buildCardAction('apikeys.action.revoke', function() {
+        revokeKey(key.id);
+      }, true));
+    } else {
+      actionRow.appendChild(buildCardAction('apikeys.action.delete', function() {
+        deleteKey(key.id);
+      }, true));
+    }
+    card.appendChild(actionRow);
+
+    cardList.appendChild(card);
+  });
+}
+
+function buildKeyCardMessage(text, isError) {
+  var card = document.createElement('div');
+  card.className = 'resource-card';
+  var value = document.createElement('div');
+  value.className = 'resource-meta-value';
+  value.textContent = text;
+  value.style.color = isError ? 'var(--danger,#f85149)' : 'var(--text-muted)';
+  card.appendChild(value);
+  return card;
+}
+
+function buildMetaItem(labelKey, valueText) {
+  var item = document.createElement('div');
+  item.className = 'resource-meta-item';
+  var label = document.createElement('div');
+  label.className = 'resource-meta-label';
+  label.textContent = tKey(labelKey);
+  var value = document.createElement('div');
+  value.className = 'resource-meta-value';
+  value.textContent = valueText;
+  item.appendChild(label);
+  item.appendChild(value);
+  return item;
+}
+
+function buildCardAction(labelKey, onClick, isDanger) {
+  var button = document.createElement('button');
+  button.type = 'button';
+  button.className = isDanger ? 'btn-secondary' : 'btn-secondary';
+  button.textContent = tKey(labelKey);
+  button.addEventListener('click', onClick);
+  return button;
 }
 
 var modal = document.getElementById('modal-create');