responsive

Activate When

• /godmode:responsive, "responsive design", "mobile-first"
• "container queries", "responsive layout", "adaptive"
• Building interfaces that must work across breakpoints

Workflow

1. Assess Requirements

grep -r "@media\|@container" --include="*.css" \
  --include="*.scss" -l 2>/dev/null | head -10
grep -r "srcset\|sizes" --include="*.html" \
  --include="*.tsx" --include="*.jsx" -l 2>/dev/null

Framework: <React/Vue/Angular/vanilla>
CSS approach: <Tailwind/CSS Modules/SCSS/CSS-in-JS>
Target devices: 320px-1536px
Strategy: mobile-first (default) | desktop-first

IF new project: always mobile-first (min-width). IF legacy desktop app: desktop-first (max-width).

2. Layout Strategy

Fluid: percentage/relative units (text-heavy, blogs)
Responsive: breakpoint-based (complex layouts)
Intrinsic: CSS Grid auto-fit/minmax (component-level)
Container queries: component responds to container

Mobile-first breakpoints: sm: 640px, md: 768px, lg: 1024px, xl: 1280px

3. CSS Grid Patterns

/* Auto-fit responsive card grid */
.card-grid {
  display: grid;
  grid-template-columns:
    repeat(auto-fit, minmax(min(300px, 100%), 1fr));
  gap: var(--spacing-6);
}

IF 2D layout (rows+columns): use Grid. IF 1D alignment (row of buttons): use Flexbox.

4. Container Queries

.card-container { container-type: inline-size; }
@container (min-width: 400px) {
  .card { flex-direction: row; }
}

IF component used in sidebar AND main content: use container queries instead of viewport media queries.

5. Fluid Typography

:root {
  --fluid-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --fluid-lg: clamp(1.125rem, 0.95rem + 0.875vw, 1.5rem);
  --fluid-xl: clamp(1.5rem, 1rem + 2.5vw, 3rem);
}

IF using fixed px font sizes: replace with clamp(). Eliminates need for typography breakpoints.

6. Responsive Images

<img src="hero-800.jpg"
  srcset="hero-400.jpg 400w, hero-800.jpg 800w,
    hero-1200.jpg 1200w"
  sizes="(max-width: 640px) 100vw, 50vw"
  loading="lazy" alt="..." />

Always: max-width: 100%; height: auto; on images. Use <picture> for art direction (different crops). Modern formats: AVIF > WebP > JPEG fallback.

7. Touch vs Pointer

@media (pointer: coarse) {
  .button { min-height: 44px; min-width: 44px; }
}
@media (pointer: fine) {
  .button { padding: 0.5rem 1rem; }
}

WCAG minimum touch target: 44x44px.

8. Responsive Tables

Stack on mobile (cards), scroll horizontal on desktop.

@media (max-width: 767px) {
  .table thead { display: none; }
  .table td { display: block; }
  .table td::before { content: attr(data-label); }
}

9. Audit

[ ] No horizontal overflow 320px-1536px
[ ] All images use srcset+sizes or SVG
[ ] Touch targets >= 44x44px
[ ] Typography uses clamp() (no fixed px)
[ ] CSS Grid/Flexbox (no float layouts)
[ ] CLS < 0.1 (explicit dimensions on media)
[ ] Consistent media query direction

Hard Rules

1. ALWAYS mobile-first for new projects.
2. NEVER use fixed px for font sizes.
3. EVERY image: srcset+sizes or SVG.
4. MINIMUM 44x44px touch targets (WCAG).
5. NEVER float-based layouts.
6. ALWAYS set width/height or aspect-ratio on media.
7. NEVER mix min-width and max-width queries.

TSV Logging

Append .godmode/responsive.tsv:

timestamp	page	viewport	issue_type	before	after	status

Keep/Discard

KEEP if: no overflow at any viewport AND CLS < 0.1.
DISCARD if: overflow detected OR CLS regressed.

Stop Conditions

STOP when FIRST of:
  - No horizontal overflow 320px-1536px
  - All images responsive
  - All touch targets >= 44px
  - CLS < 0.1 across viewports

Autonomous Operation

On failure: git reset --hard HEAD~1. Never pause.

Error Recovery

Failure	Action
Layout breaks at breakpoint	Check fixed widths, use max-width
Images overflow mobile	max-width:100%; height:auto
Touch targets too small	Add padding, min 44x44px
Horizontal scroll	Find overflowing element in DevTools