/* Physical frame shared by every chapter. Content, never the leaf, grows. */
html.book-root{height:100%;overflow:hidden}
html.book-root body.book-reader.book-reader{position:relative;inset:auto;display:flex;flex-direction:column;width:100%;height:100svh;min-height:0;max-height:100svh;overflow:hidden}
.book-reader.book-reader .reader-header{flex:none}
html.book-root .book-reader.book-reader .volume{flex:1 1 0;display:grid;grid-template-rows:57px minmax(0,1fr) 36px;min-height:0;height:auto;overflow:visible;padding-bottom:0}
html.book-root .book-reader.book-reader .spread{display:grid;grid-template-columns:36% minmax(0,1fr);transition:grid-template-columns 240ms ease; height:100%!important;min-height:0!important;max-height:none!important;overflow:hidden}
html.book-root .book-reader.book-reader .left-leaf,html.book-root .book-reader.book-reader .right-leaf{height:100%!important;min-height:0!important;max-height:none!important;overflow:auto;overscroll-behavior:contain;scrollbar-gutter:stable}
html.book-root .book-reader.book-reader .left-leaf{padding:24px}.book-reader.book-reader .archive-index{position:static;max-height:none}
.book-reader.book-reader .submarks{margin:0;align-self:start}.book-reader.book-reader footer{flex:none;margin:10px 0 0;line-height:1.5}
.book-reader.book-reader .archive-paper{height:100%;min-height:0;display:flex;flex-direction:column;overflow:hidden}
.book-reader.book-reader .archive-paper>.archive-main{flex:1 1 0;min-height:0;overflow:auto;height:auto}
.book-reader.book-reader .archive-local-nav{flex:none}
.book-reader.book-reader.book-timeline .archive-paper>.archive-main{overflow:hidden}
.book-reader.book-reader .chapter-index{max-height:calc(100% - 70px)}
/* Animate actual page snapshots; never synthesize a blank reverse face. */
:root{--turn-duration:900ms}:root[data-turn=medium]{--turn-duration:1000ms}:root[data-turn=far]{--turn-duration:1100ms}
::view-transition-group(reader-paper),::view-transition-group(reader-index){animation:none;overflow:visible;perspective:1800px}
::view-transition-group(reader-index){z-index:1}
::view-transition-old(reader-index){animation:none;opacity:0}
::view-transition-new(reader-index){animation:none;opacity:1;mix-blend-mode:normal}
::view-transition-group(reader-paper){z-index:2}
::view-transition-old(reader-paper),::view-transition-new(reader-paper){inset:0;width:100%;height:100%;max-width:100%;max-height:100%;object-fit:contain;object-position:left top;mix-blend-mode:normal;backface-visibility:hidden;transform-origin:left center;filter:none}
::view-transition-old(reader-paper){z-index:2;box-shadow:5px 3px 14px #30291530;animation:leaf-out var(--turn-duration) cubic-bezier(.35,.05,.22,1) both}
::view-transition-new(reader-paper){z-index:1;animation:none;transform:none;box-shadow:none;opacity:1}
:root[data-turn=far]::view-transition-old(reader-paper){animation-name:leaf-out;transform-origin:left center;box-shadow:3px 0 #d4c5a3,6px 0 #fff9df,9px 3px 16px #30291530}
:root[data-direction=back]::view-transition-old(reader-paper){z-index:2;transform-origin:left center;animation:leaf-back var(--turn-duration) cubic-bezier(.35,.05,.22,1) both}
:root[data-direction=back]::view-transition-new(reader-paper){z-index:1;animation:none;transform:none;filter:none;box-shadow:none}
@keyframes leaf-out{from{transform:rotateY(0)}to{transform:rotateY(-180deg)}}
@keyframes leaf-back{from{transform:rotateY(0)}to{transform:rotateY(180deg)}}
/* Cover: title, squirrel and source form compact, related groups. */
.book-reader.book-reader [data-home]{display:grid;grid-template-columns:minmax(0,1fr) 52px;align-items:center;gap:0 10px}
.book-reader.book-reader [data-home] .hero-stage{grid-column:1/-1}.book-reader.book-reader [data-hero-meta]{grid-column:1/-1;grid-row:3}
.book-reader.book-reader .home-actions{grid-column:2;grid-row:2;margin:0}.book-reader.book-reader .home-card-title{grid-column:1;grid-row:2;margin:0!important}
.book-reader.book-reader .home-actions .squirrel{width:40px;height:40px}.book-reader.book-reader .home-actions .squirrel-control{margin:0;min-width:44px}
.book-reader.book-reader .hero-image{height:clamp(180px,calc(100svh - 510px),500px)}
.book-reader.book-reader .home-disclosure summary{display:flex;align-items:center;gap:8px;list-style:none;min-width:0}
.book-reader.book-reader .home-disclosure summary::-webkit-details-marker{display:none}.book-reader.book-reader .home-disclosure summary::before{content:'▸';flex:none;font-size:.8em}.book-reader.book-reader .home-disclosure[open] summary::before{content:'▾'}
.book-reader.book-reader .home-disclosure [data-kubo-name]{display:inline;margin:0;font-size:1.05rem}.book-reader.book-reader .home-disclosure .summary-hint{margin-left:auto;float:none;white-space:nowrap;font-size:.75rem}
.book-reader.book-reader .kubo-foot{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:5px 0 10px}.book-reader.book-reader .kubo-foot .metadata{flex:1 1 150px;margin:0;font-size:.75rem}.book-reader.book-reader .kubo-foot .kubo-charm{flex:none;min-height:36px;padding:2px 4px;margin:0;font-size:.75rem}
/* Native controls keep their platform picker, but read as small paper indexes. */
.book-reader.book-reader .book-timeline-control select{min-height:44px!important;padding-left:14px;background:linear-gradient(90deg,#a7b99e 0 5px,#fffbed 5px);border-color:#c6b990;border-radius:2px 2px 7px 2px;box-shadow:1px 2px 0 #b8aa7c40;font-size:.875rem!important}
.book-reader.book-reader .book-year-control select{background:linear-gradient(90deg,#c6ad6e 0 5px,#fffbed 5px)}
.book-reader.book-reader .unit-card__members{grid-template-columns:repeat(var(--member-cols),minmax(0,66px));gap:4px;justify-content:center}.book-reader.book-reader .unit-card__petit{max-width:66px}
.book-reader.book-reader .archive-submarks{display:flex;grid-row:3;justify-content:flex-end;padding-right:16px;z-index:4}
.book-reader.book-reader .archive-submarks .archive-insert-trigger{position:relative;background:#eadcb8;min-height:36px;padding:5px 14px 9px;font-size:.85rem}
.archive-insert .insert-tabs{display:flex;gap:6px;margin:8px 0 12px}.archive-insert .insert-tabs button{flex:1;min-height:44px;font:inherit;font-size:.85rem;background:#e3e7d1;border:1px solid #b8ad8e}.archive-insert .insert-tabs button[aria-pressed=true]{background:#496c57;color:#fffbed}.archive-insert a[hidden]{display:none}
.book-reader.book-reader [data-kubo-quote]{height:auto;min-height:0;max-height:5.7em;margin:8px 0 4px;overflow:auto}
.book-reader.book-reader .kubo-foot{margin-top:4px}
.archive-insert{width:min(620px,calc(100vw - 28px));max-height:78svh;border:1px solid #b19e72;background:#fffbed;color:#344d40;padding:18px;box-shadow:4px 4px #d7caa6;border-radius:3px;overflow:auto}.archive-insert::backdrop{background:#243c3466}.archive-insert header{display:flex;justify-content:space-between;align-items:center;position:sticky;top:-18px;background:#fffbed;padding:8px 0;z-index:1}.archive-insert h2{font-size:1.1rem!important;margin:0!important}.archive-insert nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.archive-insert a{display:flex;align-items:center;gap:8px;padding:9px 4px;border-bottom:1px solid #d9cdb0;text-decoration:none;font-size:.875rem}.archive-insert img{width:65px;height:45px;object-fit:contain}.archive-insert[open]{animation:insert-rise 300ms ease-out}
@media(max-width:720px){
 html.book-root body.book-reader.book-reader{padding:8px}
 html.book-root .book-reader.book-reader .volume{grid-template-rows:43px minmax(0,1fr) 38px}
 html.book-root .book-reader.book-reader .spread{display:block}
 html.book-root .book-reader.book-reader .left-leaf{display:none}
 html.book-root .book-reader.book-reader .right-leaf{padding:14px 12px 10px;scrollbar-gutter:auto;display:block}
 .book-reader.book-reader .hero-image{height:clamp(145px,calc(100svh - 430px),550px)}
 .book-reader.book-reader .home-actions .squirrel{width:30px;height:30px}
 .book-reader.book-reader .home-disclosure [data-kubo-name]{font-size:.95rem}
 .book-reader.book-reader .unit-card__members{grid-template-columns:repeat(var(--member-cols),minmax(0,56px));gap:3px}
 .book-reader.book-reader .unit-card__petit{max-width:56px}
 .book-reader.book-reader footer{margin:7px 0 0;font-size:.65rem}
 .book-reader.book-reader .archive-paper>.archive-main{min-height:0}
}
@media(prefers-reduced-motion:reduce){::view-transition-old(*),::view-transition-new(*),::view-transition-group(*){animation:none!important}.archive-insert[open]{animation:none}}

/* Shared reading spread: normalize the hinge only while changing pages. */
@media(min-width:721px){
 html.book-root:not([data-book-turning]) .book-reader.book-reader[data-book-layout="reader"] .spread{grid-template-columns:22% minmax(0,1fr)}
 .book-reader.book-reader[data-page-kind="detail"] .submarks{display:flex}
}
.side-index-close{display:none}
.book-reader.book-reader .catalog-item>[data-fit-title],.index-sheet [data-fit-title]{overflow:visible!important;text-overflow:unset!important}
.index-sheet nav a{min-width:0}.index-sheet nav a [data-fit-title]{flex:1}
@media(max-width:720px){
 html.book-root .book-reader.book-reader[data-side-index-open] .left-leaf{display:block;position:absolute;inset:43px 8px 38px;z-index:8;width:auto;height:auto!important;max-height:none!important;background:var(--book-paper);box-shadow:0 4px 18px #243c3440;view-transition-name:none}
 .book-reader[data-side-index-open] .side-index-close{display:block;margin:0 0 12px auto;min-height:44px}
 .book-reader[data-side-index-open] .chapter-index{max-height:calc(100% - 150px)}
}
@media(prefers-reduced-motion:reduce){html.book-root .book-reader.book-reader .spread{transition:none}}