A d_ _ _ _ _ _ _ design is an in-depth version of a design by which plans, specifications, and estimates are created.

The term you're looking for is "detailed design."

Explanation

A detailed design refers to a stage in the design process where comprehensive plans, specifications, and estimates are created. This phase is crucial as it translates the conceptual designs and prototypes into a fully-realized and executable plan. During the detailed design process, engineers and designers work on specific elements, including dimensions, materials, components, and systems integration.

Furthermore, it often includes technical drawings, which serve as blueprints for manufacturing and construction. This phase also involves in-depth analysis, calculations, and simulations to ensure that the design will perform as intended under anticipated conditions. By thoroughly detailing the design, teams can identify potential issues early in the process, allowing for adjustments and refinements that ultimately enhance the project's success.