/* book_list */
#book_list li { position: relative; }
#book_list li .img_box { aspect-ratio: 1/1; }
#book_list li .atag_item { display: flex; justify-content: center; align-items: center; }
#book_list li .atag_item:before { position: absolute; width: 100%; height: 100%; background: rgba(0, 0, 0, .6); display: block; opacity: 0; top: 0; left: 0; -webkit-transform: scale(0); transform: scale(0); content: ""; }
#book_list li .atag_item span { position: relative; max-width: 90%; height: auto; color: var(--g_100); opacity: 0; z-index: 5; -webkit-line-clamp: 2; }

/* book_area */
#book_area { border-top: 1px var(--g_200) solid; }

/* content_wrap */
#content_wrap #book_list { display: grid; grid-template-columns: repeat(3, 1fr); grid-gap: 1.5em; }

/* album_list */
#album_list { width: 100%; margin: 2.5em auto 0; column-count: 3; column-gap: 1em; }
#album_list >div { margin: 0 auto 1em; break-inside: avoid; box-shadow: 0 0 .5em var(--g_200); }

@media screen and (min-width: 1161px){
	#book_list li:hover .atag_item:before { opacity: 1; -webkit-transform: scale(1); transform: scale(1); }
	#book_list li:hover span { opacity: 1; }
}
@media screen and (max-width: 640px){
	#content_wrap #book_list { grid-template-columns: repeat(2, 1fr); }
	#album_list { column-count: 2; }
}
@media screen and (max-width: 550px){
	#content_wrap #book_list { grid-gap: 3vw; }
}