diff --git a/.agent/skills/close_feature.json b/.agent/skills/close_feature.json
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-{
-  "name": "close_feature",
-  "description": "Closes a feature branch by merging it into main, verifying functionality with the user, and then pushing and deleting the branch.",
-  "instructions": "When the user invokes this skill to close a feature branch, execute the following workflow:\n\n1. Identify the current feature branch using `git branch --show-current`. If the user is currently on `main`, ask them to specify which feature branch they want to close.\n2. Use the `run_command` tool to execute `git checkout main` and `git pull origin main`.\n3. Use the `run_command` tool to execute `git merge <feature-branch>`.\n4. STOP execution and ask the user to verify that the code/application still works correctly (Control Flow). Ask them to reply with 'approved' or 'yes' when they are ready to proceed.\n5. Once the user confirms, use the `run_command` tool to execute `git push origin main` and `git branch -d <feature-branch>`.\n6. Notify the user that the feature branch has been successfully closed."
-}
diff --git a/DESIGN_GUIDE.md b/.agents/DESIGN_GUIDE.md
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diff --git a/TODO.md b/.agents/TODO.md
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diff --git a/.agents/brain.md b/.agents/brain.md
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+# FlixCooks Project Brain
+
+This document summarizes the architectural knowledge, conventions, and learnings accumulated during our session.
+
+## 1. Project Architecture & Stack
+- **Backend:** Vanilla PHP. The project intentionally avoids heavy frameworks.
+- **Database:** Flat-file JSON database (`data/recipes.json`). Data is loaded and saved via utility functions in `helpers.php`.
+- **Admin Panel (`admin.php`):** Acts as a lightweight CMS. It uses simple textareas where each line maps to an array element (e.g., for `ingredients`, `steps`, `step_videos`, `step_timers`). This keeps the JSON structure clean and parsing straightforward.
+- **Frontend:** Server-rendered PHP templates (`index.php`, `recipe.php`) with Vanilla JavaScript and Vanilla CSS. No Tailwind or heavy component libraries.
+
+## 2. Design & Aesthetics
+- **CSS:** Highly customized CSS with modern design tokens (e.g., `var(--ease-out-expo)`, `var(--surface-1)`).
+- **Animations:** Employs sophisticated micro-animations, glassmorphism (`backdrop-filter: blur`), and dynamic layouts (e.g., `clip-path` for overlays).
+- **Smooth Scrolling:** Uses **Lenis** (`LenisSmoothScroll`). 
+  - *Crucial Rule:* Whenever a fullscreen overlay (like the Cooking Mode) is opened, `lenis.stop()` must be called to prevent background scrolling. When closed, call `lenis.start()`.
+- **Preloader:** A custom `CapitoliumPreloader` runs on the homepage. It is cached in `sessionStorage('flixcooks_preloader_seen')` so it only fires once per browsing session.
+
+## 3. Antigravity Agent Configuration
+- **Workspace Rules:** Best placed in `.agents/rules/` (e.g., `AGENT.md`). To ensure they are always active, the frontmatter must include:
+  ```yaml
+  always_on: true
+  glob: "*"
+  ```
+- **Custom Skills:** Can be defined as JSON files in `.agents/skills/`. We successfully created `close_feature.json` to automate the Git workflow of checking out `main`, merging a feature branch, verifying functionality, and deleting the branch.
+
+## 4. Completed Milestones
+- **Phase 3 (Nutrition):** Implemented. Recipes now store `calories`, `protein`, `carbs`, and `fat`. Admin panel handles inputs, and the UI displays them beautifully.
+- **Phase 4 (Interactive Cooking Mode):** Implemented. Recipes now support step-by-step looping background videos and interactive timers (`step_videos`, `step_timers`). The UI utilizes a fullscreen overlay slider with Vanilla JS logic.
+
+## 5. Next Steps
+According to `TODO.md`, the next major feature block is **Phase 5 (PWA & Offline Support)**, which involves service workers, manifest files, and enabling the app to be installable on mobile devices.
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