Add page about Kibana dark mode

cloud-account/dark-mode.md

@@ -0,0 +1,31 @@
+---
+applies_to:
+  stack: all
+  serverless: all
+---
+
+# Use dark mode in Kibana
+
+The dark mode changes Kibana's default light appearance to a darker and higher-contrast color theme. From the application header, you can turn on dark mode or synchronize the color mode with your operating system settings.
+
+:::{tip}
+If you're using {{ecloud}}, this setting only applies to the Kibana UI of your serverless projects and hosted deployments. If you'd like to change the {{ecloud}} Console color theme too, you must do so separately from its respective interface.
+:::
+
+## Change your color mode preferences
+
+1. Open the user menu from the header.
+2. Select **Appearance**.
+3. Choose a color mode:
+
+    - **Light**: The default color mode of Kibana
+    - **Dark**: The dark and high-contrast color mode of Kibana
+    - **System**: Synchronizes Kibana's color mode with your system settings
+    - **Space default**: Sets the color mode to the value defined in the [Space settings](kibana://reference/advanced-settings.md#kibana-general-settings)
+
+      :::{admonition} Deprecated
+      The **Space default** option will be removed in a future version and automatically replaced with the System color mode.
+      :::
+
+4. Select **Save changes**.
+5. Refresh the page to apply the selected color mode.

cloud-account/index.md

@@ -7,7 +7,7 @@ applies:
   hosted: all
 ---
 
-# Manage your Cloud account
+# Manage your Cloud account and preferences
 
 Your {{ecloud}} account allows you to manage your personal settings, including your email address, password, and authentication methods. You can perform the following tasks at any time from your user profile:
 
@@ -21,6 +21,8 @@ If you use password-based login, then you can perform the following additional t
 
 Additionally, you can manage your organization membership, including joining or leaving an organization. Refer to [Join or leave an organization](/cloud-account/join-or-leave-an-organization.md) for more information.
 
+Some options also let you set personal preferences and customize the interface, such as [using dark mode](dark-mode.md) in your projects and deployments.
+
 ::::{tip} 
 This section focuses on the actions you can take as an individual user to manage your own account. It does not cover organization-wide settings, such as managing user permissions or configuring organization-level access controls, which are handled by the organization administrators.
 

cloud-account/toc.yml

@@ -5,4 +5,5 @@ toc:
   - file: update-your-email-address.md
   - file: change-your-password.md
   - file: add-a-login-method.md
-  - file: multifactor-authentication.md
+  - file: multifactor-authentication.md
+  - file: dark-mode.md