Personnalisez « Hero animé de page d'accueil avec vidéo plein écran »

Create a full-screen hero section landing page using React, Vite, and Framer Motion (`motion` package). Use plain CSS (no Tailwind). The font is Inter (weights 300, 400, 500, 600) from Google Fonts. The design is minimal black-and-white with a full-viewport background video. **Stack:** React 19, Vite, `motion` (framer-motion), `lucide-react` (for the Plus icon). **Layout:** - Full viewport height (`min-height: 100vh`), white background, flex column with `justify-content: space-between` - Fixed navbar at top (z-index 50, pointer-events none on the nav itself, auto on children) - Absolutely positioned full-screen video behind everything (z-index 0) - Footer content pinned to bottom (z-index 30) with a white gradient fade-up background **Navbar (fixed, top):** - Left side contains: 1. Logo: custom SVG icon (two rotated rounded rectangles at -35deg, black fill) + brand text "NeuralKinetics" (hidden on mobile, shown on desktop 768px+) 2. Menu button: black pill with white circle containing a Plus icon (lucide, size 12, strokeWidth 3) + "Menu" text (11px, white) 3. Tags pill: light gray (#F4F4F6) rounded-full container with two text labels "Advanced Bionics" and "Cognitive AI" (hidden on mobile, shown on desktop) - Right side contains: - A light gray pill with a black circle button (containing a 4-dot grid SVG icon) + label "Adaptive Systems" (hidden on mobile) **Background Video:** - autoPlay, muted, playsInline, object-fit: cover - On mobile: video wrapper is 80% width and 80% height (centered) - On desktop (768px+): video wrapper is 100% width and 100% height **Footer content (bottom, over gradient):** - Background: `linear-gradient(to top, #ffffff 0%, rgba(255,255,255,0.8) 50%, transparent 100%)` - On mobile: stacks vertically. On desktop: row layout, items aligned to bottom. - Left block: 1. Subtitle line: small black dot (8px circle) + "Best digital banking card 2026" (13px, 55% opacity black) 2. Heading: "One Card, Zero / Limits. Worldwide." on two lines. Font-weight 300, clamp(2rem, 8vw, 4.5rem) on mobile, clamp(2.5rem, 5.5vw, 4.5rem) on desktop, letter-spacing -0.03em, line-height 1 3. Two buttons: "See Features" (black pill, white text, 13px) and "How It Works" (transparent with dark border rgba(0,0,0,0.35), 13px) - Right block: Three tag pills "Neuromorphic", "AGI", "Cybernetics" (white bg, light border rgba(0,0,0,0.12), 11px, rounded-full) **Animations (using `motion` from 'motion/react'):** - Navbar: slides down from y:-16, opacity 0 to visible. Duration 0.8s, ease [0.16, 1, 0.3, 1] - Video: fades in from opacity 0 + scale 1.05 to opacity 1 + scale 1. Duration 1.8s - Footer wrapper: slides up from y:20, delay 0.5s, duration 1s - Subtitle: slides up from y:16, delay 0.6s, duration 0.8s - Heading: slides up from y:20, delay 0.8s, duration 0.8s - Buttons: slides up from y:16, delay 1.0s, duration 0.8s - All use ease: [0.16, 1, 0.3, 1] **Responsive (mobile-first, breakpoint at 768px):** - Mobile: navbar padding 16px, smaller buttons (28px circles), brand text hidden, tags hidden, right label hidden, footer stacks vertically, video at 80% size - Desktop (768px+): navbar padding 24px 32px, larger buttons (32px circles), all text/tags visible, footer is row layout, video fills 100%