Use when creating or modifying any visible UI element, adjusting spacing or typography, reviewing visual consistency, or when Lighthouse Performance drops below 90.
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This skill references the following globals — read them BEFORE starting work:
system/globals/typography.md— Font stack, heading scale, weightssystem/globals/spacing.md— Section padding, grids, container widthssystem/globals/effects.md— Border radius, shadows, card patternsystem/globals/imagery.md— Image formats, alt text, optimizationsystem/globals/responsiveness.md— Breakpoints, mobile-first rules
Visual Hierarchy, Spacing, Typography, OKLCH Color Theory, Layout Patterns
| Metric | Target | Measurement |
|---|---|---|
| Lighthouse Performance | >90 | Lighthouse JSON → categories.performance.score * 100 |
| First Contentful Paint | <1.8s | Lighthouse JSON → audits.first-contentful-paint |
| Largest Contentful Paint | <2.5s | Lighthouse JSON → audits.largest-contentful-paint |
| Cumulative Layout Shift | <0.1 | Lighthouse JSON → audits.cumulative-layout-shift |
| Total Blocking Time | <200ms | Lighthouse JSON → audits.total-blocking-time |
py-20 px-6)text-primary, not text-blue-500)rounded-xl)hidden lg:block without mobile alternative)These rules always apply — even under time pressure, even for "just a quick prototype":
py-20 px-6. "A bit more room with py-32" destroys visual consistency across sections.bg-white here" breaks dark mode immediately — without anyone noticing until they toggle.rounded-lg or rounded-md. The design system uses rounded-xl. Inconsistency is noticeable, even if individual deviations "look better."Read LEARNINGS.md in this directory to avoid known anti-patterns.
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Use when creating or modifying any UI element visible to the user, reviewing HTML markup, adding interactive elements, or when Lighthouse Accessibility drops below 90.
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Use when creating or modifying .astro/.tsx files, configuring astro.config.mjs, working with Content Collections, or when TypeScript or build errors occur.
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Use when creating or editing pages, blog posts, or content files, adding meta tags, or when Lighthouse SEO drops below 90.
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Use when completing any task (final validation step), running audits, preparing for deployment, or when ESLint/TypeScript/build errors occur.
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Use when starting work on an AstroDeck project, needing to understand the project structure, or looking up available components, sections, and layouts.
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Use when writing or reviewing any CSS class, changing colors, modifying globals.css, or when hardcoded colors or inline styles are detected.
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