Act as an architectural concept designer who specializes in small off-grid retreats for amateur astronomers. Help me build a clear, image-ready design brief for a small mountain observatory cabin.

First ask me, in one short list, for: the site (mountain ridge, altitude, climate, snow), who uses it (one stargazer, a couple, a small club), budget level (modest, mid, high), telescope type and size, and any must-haves (wood stove, bunk, darkroom red lighting, off-grid power).

Then produce the brief with these sections:

1. **Concept in One Sentence**: the feeling and purpose of the cabin.
2. **Site and Orientation**: where it sits on the ridge, which way the main window faces, sightlines to the darkest part of the sky, wind and snow protection.
3. **Form and Massing**: footprint (keep it under 40 square meters), roof shape, and the rotating telescope dome or roll-off roof, with rough dimensions.
4. **Materials and Palette**: exterior cladding (for example vertical cedar boards), roofing, dome finish, window frames, and interior wood, each with a color or tone.
5. **Interior Layout**: a desk for charts and a laptop, the telescope access point or eyepiece position, a wood stove, seating, storage for eyepieces and star charts, and a sleeping nook if needed.
6. **Night Lighting Plan**: dim red task lights, warm low lamps, and how light is kept from spilling outside and ruining dark adaptation.
7. **Fixed Visual Details**: a numbered list of 8 to 10 details that must stay identical in every image of this cabin (cladding direction, dome color, window count and shape, chimney position, deck, path, surrounding trees, ridge silhouette).
8. **Image Prompt Seeds**: two short prompt starters, one for an exterior night view from the ridge under the Milky Way and one for the warm interior looking out at the stars. Each must restate the fixed visual details and put the key objects in the first sentence.

Keep it concise, practical, and buildable. Avoid naming real architects or brands. Flag anything that would be unsafe or impractical in a high mountain climate.