Build a centered sign-up card with Tailwind CSS: one max-w-md panel floating on a muted page background, containing a logo, a name and email pair, password plus confirmation fields, a terms-of-service checkbox, and a full-width primary button. Under the card add a small 'Already have an account? Sign in' link. Keep the whole block under roughly 400px tall so the same markup drops into a modal unchanged.
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