LogWhispererAI/.opencode/skills/ui-ux-design-user-experience/references/7-responsive--adaptive-design.md at 462a5a93830d0c88964f4b6017ebb4f660c327e5

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Luca Sacchi Ricciardi aa489c7eb8 docs: add comprehensive frontend landing page plan and download design skills

Add detailed landing page development plan in docs/frontend_landing_plan.md:
- Complete landing page structure (Hero, Problem/Solution, Features, Demo, CTA)
- Design guidelines from downloaded skills (typography, color, motion, composition)
- Security considerations (XSS prevention, input sanitization, CSP)
- Performance targets (LCP <2.5s, bundle <150KB, Lighthouse >90)
- Responsiveness and accessibility requirements (WCAG 2.1 AA)
- Success KPIs and monitoring setup
- 3-week development timeline with daily tasks
- Definition of Done checklist

Download 10+ frontend/UI/UX skills via universal-skills-manager:
- frontend-ui-ux: UI/UX design without mockups
- frontend-design-guidelines: Production-grade interface guidelines
- frontend-developer: React best practices (40+ rules)
- frontend-engineer: Next.js 14 App Router patterns
- ui-ux-master: Comprehensive design systems and accessibility
- ui-ux-systems-designer: Information architecture and interaction
- ui-ux-design-user-experience: Platform-specific guidelines
- Plus additional reference materials and validation scripts

Configure universal-skills MCP with SkillsMP API key for curated skill access.

Safety first: All skills validated before installation, no project code modified.

Refs: Universal Skills Manager (github:jacob-bd/universal-skills-manager)
Next: Begin Sprint 3 landing page development

2026-04-03 13:13:59 +02:00

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Mobile-First Design

What Is It? Designing for mobile screens first, then progressively enhancing for larger screens.

Why Mobile-First?

Forces content prioritization
Better performance on mobile devices
Easier to scale up than scale down
Mobile traffic exceeds desktop globally

Process:

Design for smallest screen
Identify core content and features
Add complexity for larger screens
Test across device sizes

Breakpoints

Common Breakpoints:

Mobile: 320-480px
Tablet: 481-768px
Laptop: 769-1024px
Desktop: 1025-1200px
Large Desktop: 1201px+

Strategy:

Design for content, not devices
Let content determine breakpoints
Test on real devices when possible

Flexible Grids

Fluid Grids: Percentage-based widths, scale proportionally
CSS Grid: Two-dimensional layout system
Flexbox: One-dimensional layout, flexible distribution
Responsive Grid: Fixed columns with fluid gutters

Responsive Images

Techniques:

srcset and sizes attributes for multiple resolutions
<picture> element for art direction
CSS object-fit for container fitting

Optimization:

Use modern formats (WebP, AVIF)
Lazy loading for below-fold images
Responsive image CDNs (Cloudinary, Imgix)

Progressive Enhancement

Build core functionality first, then add advanced features for capable browsers:

Semantic HTML (baseline functionality)
CSS for presentation (enhanced visuals)
JavaScript for interactivity (advanced features)

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