/* Web (desktop ≥ 900px) styles for book detail page.
 * Loaded alongside book.css (mobile). Visibility of .web-only / .mobile-only
 * is handled by viewport gates in app_shell_head.php — this file only needs
 * to style the .web-only DOM tree.
 * Empty stub for Faz A — populate in Faz C alongside views_book_web.php. */