/* 2026-09-06: additive organization only; current site design remains intact. */
.recommend-layer{margin-top:30px;padding-top:24px;border-top:1px dashed color-mix(in srgb,var(--accent) 18%,#eadfd8);}
.recommend-layer .shelf-heading{margin-top:0;}
.recommend-layer .bookcase{background:linear-gradient(180deg,#fff,var(--pale));border-color:color-mix(in srgb,var(--accent) 12%,#eadfd8);}
.library-subgroup{margin-top:18px;border:1px solid var(--line);border-radius:20px;background:#fff;overflow:hidden;}
.library-subgroup summary{cursor:pointer;padding:16px 18px;font-size:15px;font-weight:900;color:#655660;list-style:none;}
.library-subgroup summary::-webkit-details-marker{display:none}.library-subgroup summary:after{content:"＋";float:right;color:#a4778d}.library-subgroup[open] summary:after{content:"−"}
.library-subgroup__body{padding:0 18px 20px}.library-subgroup__body>p{margin:0 0 14px;color:var(--muted);font-size:13px;line-height:1.75;}
.library-subgroup .mini-bookcase{grid-template-columns:repeat(4,minmax(0,1fr));}
.forest-library-note{margin:4px 2px 16px;color:var(--muted);font-size:13px;line-height:1.8;}
@media(max-width:680px){.recommend-layer{margin-top:24px;padding-top:20px}.library-subgroup__body{padding:0 10px 16px}.library-subgroup .mini-bookcase{display:grid;grid-auto-flow:column;grid-auto-columns:minmax(200px,64vw);grid-template-columns:none;overflow-x:auto;padding-left:max(16px,calc((100% - min(200px,64vw))/2));padding-right:max(16px,calc((100% - min(200px,64vw))/2));scroll-snap-type:x mandatory}.library-subgroup .book-entry{scroll-snap-align:center}}