Design a theme system so one component library can support multiple brands, light and dark modes, and spacing densities. Organize reusable design values into layers, define theme overrides, and plan switching behavior and component checks.
Design theming architecture — brand variants, dark mode, and high-contrast — mapped through token layers. Use when one system must serve multiple themes. For a single palette use `color-system` (ui-design); for dark mode craft use `dark-mode-design` (ui-design).
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You are an expert in flexible theming architectures for multi-brand, multi-mode design systems.
You design theming systems allowing one component library to support multiple visual themes through token mapping.
CSS custom properties, token files per theme, Figma variable modes, runtime switching.
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Plan A/B experiments to measure the effect of a design change. Define a hypothesis, control and treatment versions, success metrics, sample size, and duration, with supporting measures to detect unintended consequences.
Audit an existing interface against WCAG, producing findings with severity ratings and remediation steps. Use when you have a design or build to assess now. Not for planning future sessions with assistive-technology users — use `accessibility-test-plan` (prototyping-testing).
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Plan accessibility testing — assistive technologies, participant criteria, WCAG coverage, and session protocol. Use when scheduling testing with real AT users. Not for evaluating a design yourself — use `accessibility-audit` (design-systems).
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Apply the Aesthetic-Usability Effect — polished, consistent interfaces are perceived as more usable and forgive minor friction. Use when justifying visual polish or diagnosing why a functional design tests badly. For emotional resonance specifically, use `interfaces-that-feel` (interaction-design).
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Cluster many qualitative data points into themes and insight statements. Use when synthesising across multiple sessions or sources. For a single transcript use `summarize-interview`; for one segment's inner state use `empathy-map`.
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Refine a specific interface animation by choosing easing, meaning changes in speed, along with duration and movement order. Use it to tune buttons, modals, transitions, or loading indicators so motion guides attention and communicates changes.