Sift. Built from one prompt.

Build a SaaS hero for feature-flag platform "SIFT" with React + Tailwind. The gimmick IS the product: a huge centered toggle switch (a 120px-wide track with a sliding thumb, spring transition). Flipping it LIVE re-themes the entire page between "v1" (light #f8fafc, ink #0f172a, plain headline "Ship features.") and "v2" (dark #0b1120, text #e2e8f0, gradient-accent headline "Ship features fearlessly." plus an extra confetti burst of 12 CSS particles on flip). All colors/copy swap via a state class with 400ms transitions. Fonts "Inter Tight" 700 + "Inter". Persistent sub: "Progressive rollouts, kill switches, and A/B math your PM can read." Chips: "50MS EDGE FLAGS", "TYPED SDKS ×7", "SEV-0 KILL IN 1 CLICK". CTA "Flip your first flag" pill in #6366f1. Label under toggle: "you are previewing: v1/v2 (live)".

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