.bv-collection{display:grid;grid-template-columns:repeat(var(--bv-columns,4),minmax(110px,1fr));gap:38px 30px;align-items:end;max-width:900px;margin:30px auto;padding:12px}.bv-book{display:flex;flex-direction:column;align-items:center;gap:12px;color:inherit!important;text-decoration:none!important;perspective:1000px;outline:none}.bv-book-stage{position:relative;display:block;width:min(100%,165px);aspect-ratio:0.735;transform-style:preserve-3d;transition:transform .28s ease,filter .28s ease;filter:drop-shadow(0 9px 7px rgba(0,0,0,.22))}.bv-book-pages{position:absolute;inset:3px -5px 3px 5px;border-radius:1px 5px 5px 1px;background:repeating-linear-gradient(90deg,#f7f4ea 0,#f7f4ea 2px,#ddd8cb 3px,#faf8f1 4px);transform:translateZ(-4px)}.bv-book-cover{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;border-radius:2px 4px 4px 2px;transform-origin:left center;transform:translateZ(2px);transition:transform .34s cubic-bezier(.2,.7,.2,1),box-shadow .34s ease;box-shadow:0 1px 2px rgba(0,0,0,.25);background:#eee}.bv-book-gloss{position:absolute;inset:0;pointer-events:none;border-radius:2px 4px 4px 2px;background:linear-gradient(105deg,rgba(255,255,255,.20),transparent 26%,transparent 72%,rgba(0,0,0,.10));transform:translateZ(3px);transform-origin:left center;transition:transform .34s cubic-bezier(.2,.7,.2,1)}.bv-book:hover .bv-book-stage,.bv-book:focus-visible .bv-book-stage{transform:translateY(-7px) rotateY(-7deg) rotateX(2deg);filter:drop-shadow(0 15px 10px rgba(0,0,0,.27))}.bv-book:hover .bv-book-cover,.bv-book:focus-visible .bv-book-cover{transform:translateZ(7px) rotateY(-8deg)}.bv-book:hover .bv-book-gloss,.bv-book:focus-visible .bv-book-gloss{transform:translateZ(8px) rotateY(-8deg)}.bv-book-title{font-size: 12px;line-height:1.25;text-align:center;font-weight:600}.bv-overlay{position:fixed;inset:0;z-index:2147483000;background:#6d6d6d;display:none}.bv-overlay.is-open{display:block}.bv-overlay-frame{position:absolute;inset:0;width:100%;height:100%;border:0;background:#6d6d6d}.bv-overlay-close{position:absolute;z-index:3;right:18px;top:14px;width:44px;height:44px;border:0;border-radius:50%;background:rgba(20,20,20,.58);color:white;font:300 34px/40px Arial,sans-serif;cursor:pointer;box-shadow:0 2px 10px rgba(0,0,0,.25)}.bv-overlay-close:hover{background:rgba(0,0,0,.8)}body.bv-no-scroll{overflow:hidden!important}@media(max-width:780px){.bv-collection{grid-template-columns:repeat(3,minmax(90px,1fr));gap:28px 18px}.bv-book-stage{width:min(100%,145px)}}@media(max-width:520px){.bv-collection{grid-template-columns:repeat(2,minmax(90px,1fr));gap:26px 18px;padding:4px}.bv-book-stage{width:min(100%,140px)}.bv-overlay-close{right:10px;top:10px;width:40px;height:40px;font-size:30px}}

/* v0.1.5 - hover TOC preview (desktop mouse only) */
.bv-toc-preview{position:absolute;z-index:2147482500;display:none;width:340px;max-width:calc(100vw - 20px);max-height:min(520px,calc(100vh - 20px));box-sizing:border-box;background:rgba(27,27,27,.97);color:#fff;border:1px solid rgba(255,255,255,.22);border-radius:8px;box-shadow:0 12px 34px rgba(0,0,0,.42);overflow:hidden;text-align:left}
.bv-toc-preview.is-open{display:flex;flex-direction:column}
.bv-toc-preview-head{flex:0 0 auto;padding:11px 14px 9px;font-size:15px;font-weight:700;border-bottom:1px solid rgba(255,255,255,.18)}
.bv-toc-preview-body{overflow-y:auto;padding:5px 8px 10px}
.bv-toc-section{margin:8px 5px 3px;padding-bottom:3px;border-bottom:1px solid rgba(255,255,255,.18);font-size:13px;font-weight:700}
.bv-toc-item{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;padding:4px 6px;font-size:12px;line-height:1.3}
.bv-toc-item span{flex:1 1 auto}
.bv-toc-item b{flex:0 0 auto;min-width:22px;text-align:right}
.bv-toc-loading,.bv-toc-empty{padding:14px;font-size:12px;opacity:.75}
@media (hover:none),(pointer:coarse){.bv-toc-preview{display:none!important}}

/* v0.1.7 - interactive TOC */
button.bv-toc-item{width:100%;border:0;background:transparent;color:inherit;font-family:inherit;text-align:left;cursor:pointer}
button.bv-toc-item:hover,button.bv-toc-item:focus-visible{background:rgba(255,255,255,.12);outline:none;border-radius:4px}

/* v0.1.9 - missing issues remain visible; no dummy JSON */
.bv-book-missing{cursor:default}
.bv-book-missing .bv-missing-stage{display:flex;flex-direction:column;align-items:center;justify-content:center;box-sizing:border-box;padding:18px 14px;background:linear-gradient(145deg,#3d3d3d,#222);border:1px solid rgba(255,255,255,.16);border-radius:2px 4px 4px 2px;color:#fff;text-align:center;filter:drop-shadow(0 9px 7px rgba(0,0,0,.18))}
.bv-missing-issue{display:block;font-size:28px;font-weight:700;line-height:1;margin-bottom:18px;opacity:.72}
.bv-missing-message{display:block;font-size:14px;line-height:1.4;font-style:italic;opacity:.9}
.bv-book-missing:hover .bv-book-stage{transform:none;filter:drop-shadow(0 9px 7px rgba(0,0,0,.18))}

/* v0.2.2 - public book-open counter */
.bv-book-opens{font-size:12px;line-height:1;color:inherit;opacity:.72;text-align:center;margin-top:-5px}.bv-book-open-number{font-variant-numeric:tabular-nums}

/* v0.2.3: reserve the same counter row for missing books */
.bv-book-opens-placeholder{visibility:hidden;}

.bv-overlay-close.bv-hidden-for-toc{display:none!important}


/* v0.3.0 - bookshelf engagement */
.bv-book-meta{display:flex;align-items:center;justify-content:center;gap:10px;min-height:18px;margin-top:-5px;font-size:12px;line-height:1;color:inherit}
.bv-book-meta .bv-book-opens{margin-top:0}
.bv-book-like,.bv-book-bookmarks{display:inline-flex;align-items:center;gap:2px;cursor:pointer;user-select:none;font-variant-numeric:tabular-nums;opacity:.76}
.bv-book-like:hover,.bv-book-bookmarks:hover{opacity:1}
.bv-book-like.is-liked{color:#e32636;opacity:1}
.bv-book-bookmarks.has-bookmarks{color:#e32636;opacity:1}
.bv-collection-tools{max-width:900px;margin:18px auto -12px;padding:0 12px;display:flex;justify-content:flex-end}
.bv-my-bookmarks{border:1px solid rgba(0,0,0,.18);background:#fff;color:#222;border-radius:7px;padding:7px 11px;font:600 13px/1.2 inherit;cursor:pointer;box-shadow:0 1px 4px rgba(0,0,0,.08)}
.bv-my-bookmarks:hover{background:#f5f5f5}
.bv-bookmarks-modal{position:fixed;inset:0;z-index:2147483600;display:none;align-items:center;justify-content:center;padding:18px;background:rgba(0,0,0,.55)}
.bv-bookmarks-modal.is-open{display:flex}
.bv-bookmarks-dialog{position:relative;width:min(620px,calc(100vw - 28px));max-height:min(680px,calc(100vh - 36px));overflow:auto;background:#fff;color:#222;border-radius:10px;box-shadow:0 18px 60px rgba(0,0,0,.38);padding:20px}
.bv-bookmarks-header{display:flex;align-items:center;gap:10px;margin:0 42px 15px 0;flex-wrap:wrap}.bv-bookmarks-title{font-size:20px;font-weight:700}.bv-bookmarks-transfer{display:inline-flex;gap:6px}.bv-bookmarks-export,.bv-bookmarks-merge{border:1px solid rgba(0,0,0,.18);background:#fff;color:#222;border-radius:6px;padding:5px 9px;font:600 12px/1.2 inherit;cursor:pointer}.bv-bookmarks-export:hover,.bv-bookmarks-merge:hover{background:#f5f5f5}.bv-bookmarks-export:disabled{opacity:.45;cursor:default}
.bv-bookmarks-close{position:absolute;right:12px;top:9px;border:0;background:transparent;color:#333;font:300 30px/1 Arial,sans-serif;cursor:pointer}
.bv-bookmarks-list{display:flex;flex-direction:column;gap:7px}
.bv-saved-bookmark{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;text-align:left;border:1px solid #ddd;background:#fafafa;color:#222;border-radius:7px;padding:10px 12px;cursor:pointer;font:inherit}
.bv-saved-bookmark:hover{background:#f1f1f1}
.bv-saved-bookmark>span{display:flex;flex-direction:column;gap:3px;min-width:0}
.bv-saved-bookmark strong{font-size:13px}
.bv-saved-bookmark b{white-space:nowrap;font-size:12px}
.bv-saved-article{font-size:12px;opacity:.72;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.bv-bookmarks-empty{padding:20px 4px;opacity:.65;text-align:center}
.bv-book-missing .bv-book-opens-placeholder{display:block;min-height:18px}
@media(max-width:520px){.bv-book-meta{gap:7px;font-size:11px}.bv-collection-tools{padding:0 4px}.bv-bookmarks-dialog{padding:17px}}


/* v0.3.6 - crawlable issue archive / SEO prototype */
.bv-issue{max-width:900px;margin:28px auto 50px;padding:0 18px;box-sizing:border-box;color:inherit}
.bv-issue-header{display:grid;grid-template-columns:minmax(150px,220px) 1fr;gap:34px;align-items:start;margin-bottom:38px}
.bv-issue-cover-wrap{text-align:center}
.bv-issue-cover{display:block;width:100%;height:auto;border-radius:3px;box-shadow:0 10px 28px rgba(0,0,0,.22)}
.bv-issue-intro h1{margin:0 0 16px;font-size:clamp(26px,4vw,40px);line-height:1.2}
.bv-issue-intro p{line-height:1.75}
.bv-issue-read{display:inline-block;margin-top:8px;padding:10px 16px;border-radius:7px;background:#222;color:#fff!important;text-decoration:none!important;font-weight:700}
.bv-issue-read:hover{opacity:.86}
.bv-issue-toc h2{margin:0 0 22px;padding-bottom:10px;border-bottom:2px solid currentColor;font-size:26px}
.bv-issue-section{margin:0 0 25px}
.bv-issue-section h3{margin:0 0 8px;font-size:19px}
.bv-issue-section ul{list-style:none;margin:0;padding:0}
.bv-issue-section li{display:flex;justify-content:space-between;align-items:baseline;gap:20px;padding:8px 2px;border-bottom:1px solid rgba(127,127,127,.22);line-height:1.45}
.bv-issue-section li a{color:inherit;text-decoration:none}
.bv-issue-section li a:hover{text-decoration:underline}
.bv-issue-page{flex:0 0 auto;white-space:nowrap;font-size:13px;opacity:.68}
@media(max-width:620px){.bv-issue{padding:0 10px}.bv-issue-header{grid-template-columns:120px 1fr;gap:18px}.bv-issue-intro h1{font-size:25px}.bv-issue-intro p{font-size:14px}.bv-issue-section li{gap:10px}.bv-issue-page{font-size:12px}}
@media(max-width:430px){.bv-issue-header{grid-template-columns:1fr}.bv-issue-cover-wrap{max-width:180px;margin:0 auto}.bv-issue-intro{text-align:center}.bv-issue-toc{text-align:left}}

/* v0.3.16 - grouped master bookmark management */
.bv-bookmarks-manage{display:flex;align-items:center;gap:10px;margin:0 0 12px}
.bv-bookmarks-search{flex:1;min-width:0;border:1px solid #d6d6d6;border-radius:7px;padding:8px 10px;background:#fff;color:#222;font:inherit}
.bv-bookmarks-count{white-space:nowrap;font-size:12px;opacity:.65}
.bv-bookmark-group{border:1px solid #ddd;border-radius:8px;background:#fafafa;overflow:hidden}
.bv-bookmark-group>summary{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 12px;cursor:pointer;font-weight:700;list-style-position:inside}
.bv-bookmark-group>summary b{font-size:12px;min-width:24px;text-align:center;border-radius:12px;padding:2px 7px;background:#e9e9e9}
.bv-bookmark-group-items{border-top:1px solid #e1e1e1}
.bv-saved-bookmark-row{display:flex;align-items:stretch;border-bottom:1px solid #e6e6e6;background:#fff}
.bv-saved-bookmark-row:last-child{border-bottom:0}
.bv-saved-bookmark-row .bv-saved-bookmark{border:0;border-radius:0;background:#fff}
.bv-saved-bookmark-row .bv-saved-bookmark:hover{background:#f5f5f5}
.bv-bookmark-delete{width:42px;flex:0 0 42px;border:0;border-left:1px solid #e6e6e6;background:#fff;color:#777;font:400 22px/1 Arial,sans-serif;cursor:pointer}
.bv-bookmark-delete:hover{background:#f7eeee;color:#b00020}
@media(max-width:520px){.bv-bookmarks-manage{align-items:stretch;flex-direction:column;gap:6px}.bv-bookmarks-count{align-self:flex-end}}