Aurora Background Hero

Create an ultra-premium hero section inspired by Stripe, Linear and Apple.

The background must feature a smooth animated aurora made of large blurred gradients (purple, blue and pink) slowly moving using Framer Motion.

The animation must feel calm, elegant and luxurious.

Use:
- React
- Tailwind CSS
- Framer Motion

Requirements:
- Full viewport height
- Glass navbar
- Large bold headline
- Small subtitle
- Primary CTA
- Secondary CTA
- Floating gradient glow
- Soft grain overlay
- Perfect responsive layout
- Smooth fade-in on load
- Mouse parallax effect
- Optimized performance
- Accessible colors
- Premium spacing

Avoid:
- Flashy colors
- Fast animation
- Cheap neon effects
- Heavy CPU animations

The final result must feel like a billion-dollar SaaS landing page.

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TECHNICAL SPEC (must be respected)

Stack:
- React 18 + TypeScript (strict), Tailwind CSS, Framer Motion
- No extra animation library, no canvas unless explicitly required

Design tokens:
- Base background #0a0a0f, surfaces rgba(255,255,255,0.04)
- Borders rgba(255,255,255,0.08), primary violet #8b5cf6, secondary #a855f7
- Radius 20-28px, backdrop-blur(24px), inner highlight inset 0 1px 0 rgba(255,255,255,0.12)
- Typography: tight tracking on headings (-0.02em), 15-16px body, muted text at 60% opacity

Motion rules:
- Entrance: opacity 0 -> 1, y 24 -> 0, duration 0.7s, ease [0.16, 1, 0.3, 1]
- Stagger children by 0.06s, trigger with useInView({ once: true, margin: "-80px" })
- Hover: translateY(-6px) + soft violet glow, 250ms
- Animate only transform, opacity and filter. 60fps, will-change on animated layers
- Respect prefers-reduced-motion: disable loops, keep final states

Quality bar:
- Fully responsive (mobile-first, no horizontal scroll)
- Accessible: semantic HTML, focus-visible rings, contrast AA
- No layout shift, no dummy lorem ipsum, realistic copy
- Clean, reusable, production-ready components with typed props

Deliver the complete code, ready to paste, with no placeholder comments.