Which book packaging innovation, first widely adopted around 2000-2010, is credited with increasing both in-store and online book sales by making titles more visually distinctive on retail shelves?

The publishing industry has seen numerous innovations in product packaging over the decades, transforming how literature is marketed and consumed. From dust jackets to deckle edges, special editions to digital formats, packaging decisions have significantly impacted sales and reader engagement. This trivia question focuses on a revolutionary packaging innovation that transformed book retail and consumer behavior in the early 21st century.

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Embossed cover lettering with metallic foil accents
The rise of the 'trade paperback' format (larger than mass market, smaller than hardcover)
Interactive QR codes linking to author interviews and bonus content
Transparent plastic slip covers with 3D holographic effects