1. Account security
The c8t.sid cookie keeps your signed-in session. It is HttpOnly, Secure over HTTPS and SameSite=Lax. The c8t.csrf cookie helps protect account changes against forged requests and is readable by the application. These cookies support the service and account security.
2. Your preferences and drafts
C8T can store a theme preference in your browser. Choosing whether landing animations run stores the c8t-landing-motion preference. The signup form can keep an unfinished username and email so visiting a legal page does not erase them; it never stores the password. That draft is cleared on the next form visit after 30 minutes, but can remain if the browser does not return. The calculator can keep recent state for the current tab. Clearing storage may sign you out or reset these preferences.
3. Tracking
This release does not use advertising cookies or third-party analytics trackers. Any later use would need an updated notice and, where required, a choice before activation.
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