/* ============================================================
   Book reader — enriched, mobile-first reading layout
   Shared by any full book hosted under /books/<slug>/
   ============================================================ */

.book-shell{display:flex;align-items:flex-start;max-width:1400px;margin:0 auto;padding:0 20px 60px;gap:32px}

/* ---------- Table of contents rail ---------- */
.book-toc{
  position:sticky;top:0;align-self:flex-start;flex:0 0 260px;
  max-height:100vh;overflow-y:auto;padding:24px 16px 40px 0;
  border-right:1px solid var(--line);
}
.book-toc-head{margin-bottom:16px}
.book-toc-cover{width:84px;border-radius:4px;box-shadow:0 6px 18px rgba(27,26,46,.18);display:block;margin-bottom:10px}
.book-toc-head h2{font-family:var(--display);font-size:1.15rem;margin:0 0 2px;color:var(--ink);line-height:1.25}
.book-toc-author{font-family:var(--ui);font-size:.8rem;color:#8b8592;margin:0}
.book-toc-list{list-style:none;margin:0;padding:0;font-family:var(--ui);font-size:.86rem}
.book-toc-list li{margin:0}
.book-toc-list a{display:block;padding:7px 8px;border-radius:6px;color:#4a4652;text-decoration:none;line-height:1.35}
.book-toc-list a:hover{background:var(--parchment-2);color:var(--ink)}
.book-toc-list a.current{background:rgba(224,138,44,.16);color:var(--saffron-deep);font-weight:600}
.book-toc-list .n{display:inline-block;min-width:1.6em;color:#a49da8;font-variant-numeric:tabular-nums}
.book-toc-list small{display:block;margin-top:2px;font-size:.78em;color:#8b8592}
.tk-book-h{font-family:var(--display);font-size:1.15rem;color:var(--ink);margin:28px 0 10px}
.tk-book-h:first-of-type{margin-top:6px}
.tk-sub{margin-bottom:0}
.kural-block{margin:0 0 2em;padding-bottom:1.6em;border-bottom:1px solid var(--line)}
.kural-block:last-child{border-bottom:none;padding-bottom:0;margin-bottom:0}
.kural-num{font-family:var(--ui);font-size:.78rem;letter-spacing:.04em;text-transform:uppercase;color:var(--saffron-deep);font-weight:600;margin-bottom:6px}
.kural-verse{font-family:var(--display);font-size:1.22rem;line-height:1.55;color:var(--ink);margin:0 0 10px;font-style:italic}
.kural-commentary{font-family:var(--body);font-size:.98rem;line-height:1.65;color:#4a4652;margin:0}

.book-toc-toggle{display:none}

/* ---------- Reading column ---------- */
.book-reader{flex:1;min-width:0;padding-top:24px}
.book-reader-topline{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px;flex-wrap:wrap}
.book-back{font-family:var(--ui);font-size:.85rem;color:var(--saffron-deep);text-decoration:none;font-weight:600}
.book-back:hover{text-decoration:underline}
.book-reading-tools{display:flex;align-items:center;gap:14px}
.book-progress{font-family:var(--ui);font-size:.78rem;color:#8b8592}
.book-fontsize{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.book-fontsize button{font-family:var(--ui);font-size:.8rem;font-weight:600;background:var(--paper);border:0;padding:5px 10px;cursor:pointer;color:#6b6572}
.book-fontsize button+button{border-left:1px solid var(--line)}
.book-fontsize button.is-active{background:var(--saffron);color:var(--ink)}

.book-article{
  font-family:var(--body);color:#2c2a34;line-height:1.75;
  max-width:100%;
}
.book-article h1{
  font-family:var(--display);font-weight:600;color:var(--ink);
  font-size:2.1rem;line-height:1.2;margin:0 0 24px;
}
.book-chap-eyebrow{display:block;font-family:var(--ui);font-size:.8rem;font-weight:700;
  letter-spacing:.08em;text-transform:uppercase;color:var(--saffron-deep);margin-bottom:8px}
.book-byline{font-family:var(--ui);font-size:.9rem;color:#8b8592;margin:-14px 0 24px}
.book-article p{margin:0 0 1.15em;font-size:1.06rem}
.book-article i, .book-article em{font-style:italic}
.book-article .note-ref{
  font-family:var(--ui);font-size:.7em;vertical-align:super;color:var(--saffron-deep);
  text-decoration:none;padding:0 1px;
}
.book-article .note-ref:hover{text-decoration:underline}
.book-article a.cross-ref{color:var(--teal);text-decoration:underline;text-decoration-style:dotted}
.book-article .footnotes{margin-top:2.5em;padding-top:1.2em;border-top:1px solid var(--line);font-family:var(--ui)}
.book-article .footnotes h3{font-family:var(--display);font-size:1.05rem;color:var(--ink);margin:0 0 12px}
.book-article .footnote{font-size:.88rem;line-height:1.6;color:#5a5564;margin:0 0 .8em}
.book-article .footnote .label{color:var(--saffron-deep);font-weight:700;margin-right:4px}
.book-article .smcap{font-variant:small-caps}

.book-fig{margin:2em 0;text-align:center}
.book-fig img{max-width:100%;height:auto;border-radius:4px;box-shadow:0 8px 24px rgba(27,26,46,.15)}
.book-fig figcaption{font-family:var(--ui);font-size:.82rem;color:#8b8592;margin-top:10px;font-style:italic}
.book-fig-banner{margin:0 0 2.2em}
.book-fig-banner img{width:100%;border-radius:6px;box-shadow:0 10px 28px rgba(27,26,46,.2)}

.book-poem{
  margin:1.6em 0 1.6em 0;padding:.2em 0 .2em 1.4em;border-left:3px solid var(--gold);
  font-family:var(--body);font-style:italic;color:#4a4652;white-space:pre-wrap;line-height:1.7;
}

.book-notes{margin-top:3em;padding-top:1.6em;border-top:1px solid var(--line)}
.book-notes h4{font-family:var(--ui);font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;color:#8b8592;margin:0 0 14px}
.book-notes ol{list-style:none;margin:0;padding:0;counter-reset:none}
.book-notes li{font-family:var(--ui);font-size:.86rem;color:#5a5462;line-height:1.6;margin-bottom:10px;padding-left:.2em}
.book-notes .note-num{font-weight:700;color:var(--saffron-deep);margin-right:6px}

.book-pager{display:flex;align-items:stretch;justify-content:space-between;gap:12px;margin-top:48px;padding-top:20px;border-top:1px solid var(--line)}
.book-pager-link{flex:1;max-width:38%;display:flex;flex-direction:column;gap:2px;padding:12px 14px;border:1px solid var(--line);border-radius:10px;text-decoration:none;background:var(--paper)}
.book-pager-link:hover{border-color:var(--saffron)}
.book-pager-link.is-next{text-align:right;align-items:flex-end}
.book-pager-label{font-family:var(--ui);font-size:.72rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--saffron-deep)}
.book-pager-sub{font-family:var(--body);font-size:.86rem;color:#4a4652;line-height:1.3}
.book-pager-link.is-disabled{visibility:hidden}
.book-pager-toc{align-self:center;font-family:var(--ui);font-size:.82rem;font-weight:600;color:#8b8592;text-decoration:none;white-space:nowrap}
.book-pager-toc:hover{color:var(--saffron-deep)}

/* ---------- Font-size states, applied to body.book-body ---------- */
.book-body[data-book-fontsize="sm"] .book-article{font-size:.92rem}
.book-body[data-book-fontsize="sm"] .book-article p{font-size:.95rem}
.book-body[data-book-fontsize="lg"] .book-article p{font-size:1.2rem}
.book-body[data-book-fontsize="lg"] .book-article{line-height:1.85}

/* ---------- Book landing / cover page ---------- */
.book-cover-hero{display:flex;gap:36px;align-items:flex-start;max-width:1000px;margin:0 auto;padding:48px 20px 20px;flex-wrap:wrap}
.book-cover-img{width:220px;flex:none;border-radius:6px;box-shadow:0 14px 34px rgba(27,26,46,.25)}
.book-cover-info{flex:1;min-width:260px}
.book-cover-info .eyebrow{font-family:var(--ui);font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;color:var(--saffron-deep);font-weight:600;margin-bottom:10px}
.book-cover-info h1{font-family:var(--display);font-size:2.4rem;margin:0 0 6px;color:var(--ink);line-height:1.15}
.book-cover-info .book-author{font-family:var(--ui);font-size:1rem;color:#6b6572;margin:0 0 18px}
.book-cover-info p{font-family:var(--body);font-size:1.02rem;line-height:1.65;color:#4a4652;max-width:62ch}
.book-cover-actions{display:flex;gap:12px;margin-top:22px;flex-wrap:wrap}
.book-cover-actions .btn{font-family:var(--ui);font-weight:600;padding:11px 22px;border-radius:8px;text-decoration:none;font-size:.92rem}
.book-cover-actions .btn-primary{background:var(--saffron);color:var(--ink)}
.book-cover-actions .btn-primary:hover{background:#f0a24f}
.book-cover-actions .btn-ghost{border:1px solid var(--line);color:var(--ink);background:var(--paper)}
.book-cover-actions .btn-ghost:hover{border-color:var(--saffron)}
.book-cover-note{margin-top:18px;font-family:var(--ui);font-size:.82rem;color:#8b8592}

.book-summary{max-width:1000px;margin:8px auto 0;padding:0 20px}
.book-summary h2{font-family:var(--display);font-size:1.5rem;color:var(--ink);margin:0 0 14px}
.book-summary p{font-family:var(--body);font-size:1.02rem;line-height:1.7;color:#4a4652;max-width:74ch;margin:0 0 16px}
.book-summary p:last-child{margin-bottom:0}
.book-cover-toc{max-width:1000px;margin:36px auto 0;padding:24px 20px 60px;border-top:1px solid var(--line)}
.book-cover-toc h2{font-family:var(--display);font-size:1.5rem;color:var(--ink);margin:0 0 16px}
.book-cover-toc .book-toc-list{columns:2;column-gap:32px;font-size:.92rem}
.book-cover-toc .book-toc-list li{break-inside:avoid}
.book-cover-toc .book-toc-list a{padding:6px 4px}

/* ---------- Mobile ---------- */
@media(max-width:900px){
  .book-shell{gap:0;padding:0 16px 40px}
  .book-toc-toggle{
    display:block;position:sticky;top:0;z-index:20;width:100%;text-align:left;
    margin:14px 0 0;padding:10px 14px;border:1px solid var(--line);border-radius:8px;
    background:var(--paper);font-family:var(--ui);font-weight:600;font-size:.9rem;color:var(--ink);
  }
  .book-toc{
    position:fixed;inset:0 20% 0 0;z-index:30;max-width:340px;
    background:var(--parchment);border-right:1px solid var(--line);
    padding:20px 18px 40px;box-shadow:10px 0 30px rgba(0,0,0,.25);
    transform:translateX(-105%);transition:transform .22s ease;max-height:100vh;
  }
  .book-toc.is-open{transform:translateX(0)}
  .book-toc-backdrop{display:none;position:fixed;inset:0;background:rgba(15,14,26,.45);z-index:29}
  .book-toc-backdrop.is-open{display:block}
  .book-reader{padding-top:14px}
  .book-reader-topline{gap:8px}
  .book-cover-hero{padding-top:28px;gap:22px}
  .book-cover-img{width:150px}
  .book-cover-info h1{font-size:1.9rem}
  .book-cover-toc .book-toc-list{columns:1}
  .book-pager-sub{display:none}
}
@media(max-width:480px){
  .book-article h1{font-size:1.7rem}
  .book-article p{font-size:1rem}
  .book-reading-tools{width:100%;justify-content:space-between}
}