.book-format-menu,.book-formats{position:relative}.book-format-menu>summary{gap:6px;cursor:pointer;list-style:none}.book-format-menu>summary::-webkit-details-marker{display:none}.book-format-menu>summary:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.book-format-menu>summary .tab__count{margin-left:-6px}.book-format-menu__chevron{margin-right:-4px;transition:transform .16s ease}.book-format-menu[open] .book-format-menu__chevron{transform:rotate(180deg)}.book-format-menu__list{position:absolute;z-index:20;top:calc(100% + var(--space-1));left:0;min-width:300px;max-height:min(60vh,480px);overflow-y:auto;margin:0;padding:var(--space-1) 0;list-style:none;background:var(--surface);border:1px solid var(--border-strong);border-radius:var(--radius-sm);box-shadow:var(--shadow-raised)}.book-format-menu__list li+li{border-top:1px solid var(--border)}.book-format-menu__item{display:flex;flex-direction:column;gap:2px;min-height:var(--hit-target);padding:10px 14px;text-decoration:none;color:var(--text)}.book-format-menu__item:hover{background:var(--surface-sunken)}.book-format-menu__item:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}.book-format-menu__item[aria-current=page]{box-shadow:inset 3px 0 0 var(--text)}.book-format-menu__item[aria-current=page] .book-format-menu__date{font-weight:600}.book-format-menu__date{display:flex;align-items:center;gap:var(--space-2);font:500 14px/20px var(--font-ui),-apple-system,sans-serif}.book-format-menu__meta{font:400 13px/18px var(--font-ui),-apple-system,sans-serif;font-feature-settings:"tnum";font-variant-numeric:tabular-nums;color:var(--text-muted)}@media (max-width:640px){nav.book-formats .lib-filters{flex-wrap:wrap;justify-content:center;overflow:visible}.book-format-menu{position:static}.book-format-menu__list{right:0;min-width:0;text-align:left}}