プロンプト
A lonely observatory dome on a crater rim, one window glowing against the void. 2026 trade-cover trend: oversized structural typography, high-contrast palette, strong readability at thumbnail size. All cover text must be Japanese only; render the quoted title and author name in correct, complete Japanese characters. Book cover with title "沈黙の観測所" and author name "高遠イツキ" rendered on the cover.. Workflow direction: Create the finished flat front-cover artwork itself, not a photograph or mockup of a physical book. The rectangular front cover must fill the entire output canvas edge to edge, viewed perfectly straight-on with the camera perpendicular to the artwork. Build one compelling genre-appropriate key image on a single strong subject in a single scene — never a collage of competing motifs. Follow the 2026 trade-cover direction: oversized structural title typography treated as part of the artwork, a high-contrast palette, an author name placed deliberately and secondary to the title, short correctly rendered title text in the requested language enclosed in quotation marks, and a silhouette that stays readable at 100-pixel thumbnail size in a two-second scroll, all with trim-safe breathing room.
Style-specific direction:
Style: premium science-fiction book cover with cinematic speculative-world design, clearly technological rather than fantasy; polished cinematic digital painting, optionally carrying a restrained retro-pulp print texture.
Subject: preserve the requested explorer, machine, planet, and setting; use one scientifically coherent futuristic focal idea.
Composition: portrait front-cover layout, horizon-scale environment, strong lower-third silhouette, open title-safe upper field, thumbnail readability.
Lighting or Color: electric blue, white, and deep space black with one warm accent; controlled volumetric light and precise hard-surface detail.
Typography: render the exact quoted title once in tall geometric techno capitals and the exact quoted author once in smaller spaced capitals; keep both crisp and correctly spelled.
Output format: flat front-cover artwork only, filling the canvas edge to edge and viewed perfectly straight-on; no physical book object, medieval runes, magic portal, fantasy crystal, spine, pages, back cover, perspective, mockup, badge, logo, watermark, or duplicated text.. Avoid: physical book, 3D book, book mockup, product mockup, spine, pages, page edges, back cover, perspective view, angled cover, tabletop, pedestal, hands holding a book, room scene, drop shadow around the cover, misspelled title, crowded typography, weak focal point, busy collage of competing motifs, washed-out low contrast, text too close to edges, unrelated imagery, garbled author name, misspelled or duplicated title, misspelled author, fantasy crystal, medieval architecture, generic space collage, mockup, spine, watermark
