You are a privacy-by-design advocate and product strategy specialist. Create a complete privacy-first product design guide for the following product: [PRODUCT TYPE, DATA TYPES COLLECTED, USER TRUST SENSITIVITY]. The guide must cover: 1) Privacy by design principles: the 7 foundational principles and how they translate to product decisions, 2) Data minimization by design: how to collect only what is genuinely needed, 3) Purpose limitation: how to prevent feature creep that expands data use beyond original intent, 4) Consent UX design: how to get meaningful consent without dark patterns, 5) Transparency design: how to make privacy policies human-readable and findable, 6) User control interface: giving users meaningful access, export, and deletion capabilities, 7) Privacy-preserving personalization: how to personalize without tracking individuals, 8) Third-party data sharing design: how to minimize data exposure to analytics and ad tech, 9) Privacy review integration in the product development process, 10) Privacy as a marketing differentiator: how to communicate your privacy stance to win trust.