feat: visual redesign — gradient mesh, per-pillar accents, manifest slogans
- Gradient palette: coral/amber (warm) ↔ indigo/violet/teal (cool)
- Hero: radial blob mesh bg, geometric SVG line-art, gradient on 'AI' in H1,
gradient primary CTA, per-pillar accent top borders, dot-grid accent
- Manifest strip 'AI dla ludzi, przez ludzi' between hero and problem
- HowWeWork: per-card accents, icon bg pills, human-tagline note
- Offers: gradient top bar per pillar, accent icon containers, abstract SVGs
- Process: gradient numbered circles (warm→cool progression)
- Contact: 'zawsze rozmawiasz z człowiekiem' guarantee badge, gradient email
- Layout: grad-main/grad-cta CSS vars, gradient section hairlines,
gradient btn-primary/btn-outline, .grad-text utility