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Build a custom, full-stack Giveaway and Sweepstakes application using Next.js 14 App Router, Supabase (PostgreSQL), Tailwind CSS, and Shadcn UI.  1. SYSTEM ARCHITECTURE & DATA MODEL - Create a Supabase schema with tables: `campaigns` (id, title, description, start_at, end_at, is_active), `actions_config` (id, campaign_id, action_type [email_signup, shopify_order, secret_code, referral], entry_points, settings_json), `participants` (id, email, name, IP_address, referral_code, referred_by_id), `entries` (id, campaign_id, participant_id, action_config_id, points_awarded, metadata_json, created_at). 2. EMBEDDABLE WIDGET & UI - Create an embeddable React widget component that renders inside an iframe or custom element. - Display campaign progress, remaining time, total entry count, and user's current earned entries. - Render list of available action items (e.g., 'Submit Email', 'Enter Secret Code', 'Share with Friends'). 3. CORE LOGIC & ENTRIES - Implement email submission logic with server-side validation and duplication checks per campaign. - Build a unique referral link generator (`/giveaway?ref=USER_ID`). When a referred user signs up, trigger a server action adding referral points to the referrer. - Implement a weighted random winner selection algorithm in a Server Action: aggregate total points per participant as weight, execute random selection, and write to a `winners` table. 4. ANTI-FRAUD & INTEGRATION - Implement basic anti-fraud: restrict maximum entries per IP within 1 hour, validate disposable email domains using a public blocklist, and integrate hCaptcha on entry forms. - Expose an authenticated API endpoint (`/api/webhooks/shopify/order`) that accepts order webhooks, matches customer email, and grants 1 entry point per $1 spent. 5. OUT OF SCOPE - Direct API verification for external social networks (e.g., checking via API if a user followed an Instagram account). Rely on client-side self-reporting with trust-based validation for social clicks.

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