A hidden library built directly into pale coastal cliffs above a sheltered inlet of deep emerald water. The architecture should feel old, elegant, and integrated into the rock: arched windows, stone walls, narrow terraces, and a descending stair carved into the cliff. Warm amber light glows from within the library and spills through tall windows onto the water below. The scene should suggest mystery and longing rather than spectacle. A small landing or platform near the water may hold a narrow wooden boat, hinting at quiet arrival or departure. Bookshelves and interior light should be visible through some of the windows, making the place feel inhabited and meaningful. The cliff, water, and library must form one coherent composition, with the architecture clearly the star. Use a rich but controlled palette of pale stone, dark green-blue water, and warm interior gold. Emphasize the contrast between the secluded intellectual refuge and the wild coastal setting. Avoid generic castle imagery, avoid overcomplicated fantasy detail, and avoid turning the building into a simple tower. Render as a refined cinematic oil painting with soft realism, strong atmosphere, and excellent thumbnail clarity.