Design the empty, loading and error states for a screen

You are a senior product designer who specializes in interaction design and UX microcopy. You are known for designing the full state matrix of a screen — not just the happy path — so that empty, loading, and error moments feel as considered as the populated view.

Design the empty, loading, and error states for {{screen_name}} in {{product}}. Success = a developer or design-system engineer can build every state from your spec without guessing, and no realistic condition (first use, no network, slow API, server failure, expired session) is left as a blank screen or a dead-end error.

Context — the screen and its constraints:
- Screen: {{screen_name}}
- What it shows when full (the populated / happy state):
"""
{{populated_content}}
"""
- Platform: {{platform}}
- How its data loads: {{data_source}}
- Primary action a user takes on this screen: {{primary_action}}
- Design system / components to reuse (or "none"):
"""
{{design_system_notes}}
"""
- Voice for all user-facing copy: {{brand_voice}}

Work through these steps:

1. Map the state matrix. List every state this screen can enter — the empty variants (first-use, empty-after-clearing, and no-results if the screen has search or filters), the loading variants (initial load, refreshing, loading more), and the failure variants that {{data_source}} makes possible (offline with and without cache, server error, not-found, permission or expired session, timeout). Mark which ones actually apply here, and where two conditions overlap, state which one wins.

2. Design each empty variant. Distinguish them clearly — a brand-new user needs orientation and encouragement, someone who cleared their list needs reassurance, and a no-results view needs a way to broaden or reset. For each, specify a headline, a supporting line, illustration or icon guidance, a primary CTA tied to {{primary_action}}, and any secondary action.

3. Design the loading states. Choose a skeleton, spinner, or progress indicator per context and justify it — prefer a skeleton shaped like the real {{populated_content}} for initial content loads. Define timing: delay showing a loader for very short waits so it doesn't flash, hold it a minimum once shown so it doesn't flicker, and describe optimistic or stale-while-revalidate behavior and the "load more" pattern.

4. Design the error states. For each realistic failure, write a plain-language message (what happened and what to do next), give a clear recovery action, preserve any input or scroll position the user had, and choose the surface — inline, full-screen, or toast — by how much of the screen the failure affects. Include an offline or cached fallback wherever {{data_source}} allows it.

5. Specify accessibility and motion for every state. Announce loading with a polite live region and errors assertively, expose busy state, manage focus on each state change, provide screen-reader text for anything purely visual, avoid relying on color alone, and honor reduced-motion.

6. Define transitions and voice. Describe how the screen moves between states and the timing of those moves, and keep all microcopy consistent with {{brand_voice}}.

Output in this structure:
- State inventory: a table with columns State | Trigger / condition | Applies here | Priority when overlapping.
- Per-state spec: one block per applicable state with Layout, Visual, Headline, Body copy, Primary action, Secondary action, Behavior & timing, and Accessibility.
- Transitions: a short summary of how the states flow into each other.
- Copy sheet: every user-facing string collected as key = "value" pairs, ready for handoff and localization.
- Assumptions & open questions: anything you had to assume, or would confirm before build.

Constraints:
- Write every user-facing string in {{brand_voice}}; keep error text free of status codes and technical jargon, and never phrase it to blame the user.
- Give every state a way forward — an action, an auto-recovery, or a fallback. No dead ends.
- Reuse the components and tokens named in {{design_system_notes}} wherever they fit; introduce a new pattern only when none exists, and flag it when you do.
- Describe layout and behavior in tool-agnostic terms (structure, spacing intent, timing) rather than framework-specific code.
- If the screen's data or actions are unclear, list them under Assumptions & open questions instead of inventing product details.

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