refactor: split assets

assets/themes/nms/CLAUDE.md

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+# NMS (No Man's Sky) Theme
+
+Space exploration theme inspired by No Man's Sky. Dark cosmic backgrounds, asteroid fields, cargo freighters, planet panoramas.
+
+## Asset Inventory
+
+| Category | Path | Count | Description |
+|----------|------|-------|-------------|
+| Hero images | `hero-images/spaceship{1-9}.{jpeg,png}` | 15 | Spaceships for page headers |
+| Splitters | `hero-images/splitters/splitter{1-9}.png` | 9 | Splitting ship variants |
+| Footers - Planets | `footers/planet{1-9}.jpeg` | 9 | Planet panoramas |
+| Footers - Cabins | `footers/cabin{1-9}.jpeg` | 9 | Ship interior views |
+| Icons Pack 1 | `icons/pack1/` | 60 | Minerals & plants (space-exploration) |
+| Icons Pack 2 | `icons/pack2/` | 60 | Elements (space-exploration) |
+| Icons Pack 3 | `icons/pack3-asteroids/` | 16 | Colored asteroid icons |
+| Icons Pack 4 | `icons/pack4-cargobay/` | 9 | Cargo bay icons |
+| Asteroids | `items/asteroids/` | 17 | Full-size colored asteroid images |
+| Asteroid shapes | `items/asteroid-shapes/` | 16 | Line-art asteroid silhouettes |
+| Freighters | `items/freighters/` | 30 | Ships and pods |
+| Plants | `items/plants/` | 6 | Decorative plant icons |
+| Stones | `items/stones/` | 6 | Stone/mineral textures |
+| Elements | `items/elements/` | 4 | Element icons |
+
+**Legacy:** `icons/pack1-2-unused/` (136 files) — superseded by pack2, kept for reference.
+
+## Usage in Templates
+
+All paths relative to project root:
+- HTML templates: `/assets/themes/nms/{category}/{file}`
+- Generator scripts (from docs/): `../../assets/themes/nms/{category}/{file}`
+- Generator scripts (from project root): `assets/themes/nms/{category}/{file}`
+
+## Color Palette
+
+| Element | Class |
+|---------|-------|
+| Title text | `text-indigo-950` |
+| Subtitle | `text-indigo-400` |
+| Card border | `border-indigo-100` |
+| Answer underline | `border-indigo-300` |
+| Card bg gradient | `from-white to-indigo-50/40` |
+| Badges | `bg-indigo-600` |
+
+## Adding New Assets
+
+1. Generate via `/gen-image` with `--ref` from same category for visual consistency
+2. Save raw output (white background) to `items/{category}/raw/`
+3. Run `pnpm remove-bg` if transparent background needed
+4. Move final PNG to `items/{category}/`
+
+## Reference Policy
+
+- `items/asteroids/` — use any existing asteroid as `--ref`
+- `items/crystals/` — use any existing crystal as `--ref`
+- `icons/` — generate independently (icon packs have their own pipeline)
+- `hero-images/`, `footers/`, `backgrounds/` — generate independently
+
+## Cargo Bay Image Generation
+
+Proven approach for generating `cargo-bayN.jpeg` from `spaceshipN.jpeg`:
+- **Ref**: use original `spaceshipN.jpeg` first, then iterate using the generated `cargo-bayN.jpeg` as ref
+- **Template**: `illustration`, **Aspect**: `16:9`, **Flag**: `--no-enhance`
+- **Key prompt elements**: describe the ship's unique features, emphasize "NO landing gear", "rear engines glow", "open cargo bay hatch", "flying in zero gravity", "white background", "concept art illustration style"