/* =========================================================================
   पुस्तकालय — immersive book reader
   No external assets. All textures are generated (SVG data URIs / gradients).
   ========================================================================= */

:root{
  --fs: 17px;                 /* base reading size (user adjustable) */
  --warm: 45;                 /* paper warmth 0..100 */
  --flip: 760ms;
  --ease: cubic-bezier(.45,.06,.25,1);

  /* light "daylight desk" palette */
  --desk-a:#3a2a22;
  --desk-b:#211711;
  --desk-glow:rgba(255,214,150,.16);

  --cover-a:#8c1c13;
  --cover-b:#5a0f09;
  --cover-edge:#3c0906;
  --gold:#d9b26a;
  --gold-dim:#a9873f;

  --paper:#f6ecd8;
  --paper-2:#efe2c8;
  --paper-edge:#d8c6a3;
  --ink:#2b2118;
  --ink-soft:#5b4b3a;
  --rule:rgba(90,70,45,.18);
  --accent:#8c1c13;
  --accent-2:#1f5c4a;

  --ui-bg:rgba(24,17,13,.86);
  --ui-fg:#f2e7d5;
  --ui-line:rgba(255,235,205,.16);
  --ui-muted:rgba(242,231,213,.62);
  --ui-accent:#e0b567;

  --panel:#1d1510;
  --panel-2:#261b14;
}

html[data-theme="dark"]{
  --desk-a:#0d0b0a;
  --desk-b:#050403;
  --desk-glow:rgba(255,190,120,.07);
  --cover-a:#33241f;
  --cover-b:#1c120f;
  --cover-edge:#100a08;
  --gold:#b98f4d;
  --paper:#231f1b;
  --paper-2:#1c1917;
  --paper-edge:#0f0d0b;
  --ink:#e3d7c2;
  --ink-soft:#b3a48c;
  --rule:rgba(226,206,170,.15);
  --accent:#d98d5f;
  --accent-2:#79b39b;
  --ui-bg:rgba(12,10,9,.92);
  --ui-line:rgba(235,215,180,.14);
  --ui-muted:rgba(227,215,194,.58);
  --ui-accent:#d9a75c;
  --panel:#131010;
  --panel-2:#1a1614;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:"Kohinoor Devanagari","Noto Sans Devanagari","Nirmala UI",Mangal,"Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
  background:var(--desk-b);
  color:var(--ui-fg);
  overflow:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
button{font:inherit;color:inherit}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.muted{color:var(--ui-muted)}
.small{font-size:.82em;line-height:1.55}

#app{position:fixed;inset:0;display:grid;grid-template-rows:auto 1fr auto}

/* ---------------- desk ---------------- */
#stage{
  position:relative;
  overflow:hidden;
  display:grid;place-items:center;
  background:
    radial-gradient(120% 90% at 50% 6%, var(--desk-glow), transparent 60%),
    radial-gradient(90% 70% at 50% 108%, rgba(0,0,0,.55), transparent 62%),
    linear-gradient(160deg,var(--desk-a),var(--desk-b));
}
#stage::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:var(--deskGrain);
  opacity:.5;mix-blend-mode:overlay;
}
#scene{position:relative;width:100%;height:100%;display:grid;place-items:center;padding:26px 20px}

/* ---------------- book ---------------- */
.book{
  position:relative;
  perspective:2600px;
  perspective-origin:50% 46%;
  touch-action:pan-y;
}
.book-block{
  position:relative;
  transform-style:preserve-3d;
  transition:transform .5s var(--ease);
}
.book-shadow{
  position:absolute;left:50%;bottom:-30px;transform:translateX(-50%);
  width:min(88%,1080px);height:56px;
  background:radial-gradient(closest-side,rgba(0,0,0,.62),rgba(0,0,0,0));
  filter:blur(9px);pointer-events:none;
}
.edge{position:absolute;top:0;bottom:0;width:26px;pointer-events:none;z-index:0;
  background:linear-gradient(to right,var(--cover-edge),var(--cover-a) 45%,var(--cover-b));
  box-shadow:0 24px 60px rgba(0,0,0,.55);border-radius:6px;
}

.edge::after{content:"";position:absolute;inset:7px 0;border-top:1px solid rgba(255,220,160,.18);border-bottom:1px solid rgba(0,0,0,.35)}

.leaves{position:absolute;inset:0;transform-style:preserve-3d}

.leaf{
  position:absolute;top:0;
  left:var(--spineX,0px);
  transform-style:preserve-3d;
  transform-origin:left center;
  transition:transform var(--flip) var(--ease);
  will-change:transform;
}
.blank{position:absolute;inset:0;background:linear-gradient(168deg,var(--paper-2),var(--paper))}
.blank::after{content:"";position:absolute;inset:0;background-image:var(--paperGrain);opacity:.3;mix-blend-mode:multiply}
.leaf.flipped{transform:rotateY(-180deg)}
.leaf.noanim{transition:none}
.face{
  position:absolute;inset:0;
  backface-visibility:hidden;-webkit-backface-visibility:hidden;
  overflow:hidden;
  background:linear-gradient(168deg,var(--paper),var(--paper-2));
  color:var(--ink);
}
.face::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:var(--paperGrain);
  opacity:calc(.30 + var(--warm) * .006);
  mix-blend-mode:multiply;
}
.face::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(140% 110% at 18% 8%,rgba(255,255,255,.22),transparent 55%);
  opacity:.5;
}
html[data-theme="dark"] .face::after{opacity:.12}
.face-front{border-radius:2px 10px 10px 2px;box-shadow:inset 1px 0 0 rgba(255,255,255,.35),0 1px 0 rgba(0,0,0,.12)}
.face-back{transform:rotateY(180deg);border-radius:10px 2px 2px 10px}

/* spine gutter shadow + outer shade */
.gutter{position:absolute;top:0;bottom:0;width:16%;pointer-events:none;z-index:3}
.gutter-r{right:0;background:linear-gradient(to left,rgba(60,40,20,.34),rgba(60,40,20,.10) 38%,transparent)}
.gutter-l{left:0;background:linear-gradient(to right,rgba(60,40,20,.34),rgba(60,40,20,.10) 38%,transparent)}
.face-front .gutter-l,.face-back .gutter-r{opacity:.35}
html[data-theme="dark"] .gutter-r{background:linear-gradient(to left,rgba(0,0,0,.75),rgba(0,0,0,.28) 38%,transparent)}
html[data-theme="dark"] .gutter-l{background:linear-gradient(to right,rgba(0,0,0,.75),rgba(0,0,0,.28) 38%,transparent)}

/* moving shadow while a leaf is in flight */
.sweep{position:absolute;inset:0;pointer-events:none;z-index:4;opacity:0;
  background:linear-gradient(100deg,rgba(20,10,0,.42),rgba(20,10,0,0) 62%)}
.leaf.turning .sweep{animation:sweepFade var(--flip) var(--ease)}
@keyframes sweepFade{0%{opacity:.9}55%{opacity:.35}100%{opacity:0}}

/* cast shadow onto the page beneath */
.cast{position:absolute;inset:0;pointer-events:none;z-index:2;opacity:0;
  background:linear-gradient(90deg,rgba(0,0,0,.30),transparent 55%)}
.leaf.cast-on .cast{animation:castFade var(--flip) var(--ease)}
@keyframes castFade{0%{opacity:.15}45%{opacity:.75}100%{opacity:0}}

/* ---------------- page content ---------------- */
.pg{
  position:absolute;inset:0;
  isolation:isolate;
  padding:calc(var(--fs) * 2.6) calc(var(--fs) * 2.3) calc(var(--fs) * 2.9);
  display:flex;flex-direction:column;
  overflow:hidden;
  font-size:var(--fs);
  line-height:1.78;
}
.pg-back{padding-left:calc(var(--fs) * 2.9);padding-right:calc(var(--fs) * 2.1)}
.pgnum{
  position:absolute;bottom:calc(var(--fs) * .95);left:0;right:0;
  text-align:center;font-size:.72em;letter-spacing:.14em;color:var(--ink-soft);opacity:.75;
}
.pgnum span{display:inline-block;padding:0 .7em}
.folio-rule{width:34px;height:1px;background:var(--ink-soft);opacity:.4;margin:0 auto calc(var(--fs)*.55)}

/* running head */
.rhead{
  font-size:.68em;letter-spacing:.18em;text-transform:uppercase;
  color:var(--ink-soft);opacity:.72;text-align:center;
  margin:0 0 calc(var(--fs) * 1.15);
  padding-bottom:.55em;border-bottom:1px solid var(--rule);
}

.para{margin:0 0 1.02em;text-align:justify;hyphens:auto}
.para.first::first-letter{}
.drop::first-letter{
  float:left;font-size:3.1em;line-height:.82;padding:.06em .12em 0 0;
  color:var(--accent);font-weight:600;
}
h1.pt,h2.pt,h3.pt{margin:0 0 .7em;line-height:1.32;color:var(--ink);font-weight:650}
h1.pt{font-size:1.62em}
h2.pt{font-size:1.28em}
h3.pt{font-size:1.06em}
.sub{font-size:.9em;color:var(--ink-soft);margin:-.5em 0 1.2em;line-height:1.85}
.center{text-align:center}

ul.pt,ol.pt{margin:0 0 1.1em;padding-left:1.35em}
ul.pt li,ol.pt li{margin-bottom:.5em}
blockquote.pt{
  margin:0 0 1.15em;padding:.15em 0 .15em 1.05em;
  border-left:2px solid var(--accent);
  color:var(--ink-soft);font-style:italic;
}
.box{
  margin:0 0 1.15em;padding:.95em 1.05em;border-radius:4px;
  background:linear-gradient(180deg,rgba(140,28,19,.07),rgba(140,28,19,.02));
  border:1px solid var(--rule);border-left:3px solid var(--accent);
  font-size:.92em;line-height:1.68;
}
.box b{color:var(--accent)}
.box.alt{border-left-color:var(--accent-2);background:linear-gradient(180deg,rgba(31,92,74,.08),rgba(31,92,74,.02))}
.box.alt b{color:var(--accent-2)}
table.pt{width:100%;border-collapse:collapse;font-size:.86em;margin:0 0 1.1em}
table.pt th,table.pt td{border-bottom:1px solid var(--rule);padding:.42em .5em;text-align:left;vertical-align:top}
table.pt th{color:var(--accent);font-weight:650;letter-spacing:.02em}

.illus{margin:.4em auto 1.15em;display:block;max-width:100%;height:auto}

/* --- verse blocks --- */
.v{margin:0 0 1.35em;break-inside:avoid}
.v-head{
  display:flex;align-items:baseline;gap:.55em;margin-bottom:.42em;
}
.v-num{
  font-size:.68em;letter-spacing:.1em;color:#fff;background:var(--accent);
  padding:.16em .6em;border-radius:99px;font-weight:600;white-space:nowrap;
}
.v-tag{font-size:.66em;letter-spacing:.1em;color:var(--ink-soft);text-transform:uppercase}
.v-dev{
  font-size:1.06em;line-height:1.82;text-align:center;margin:0 0 .5em;
  color:var(--ink);font-weight:500;letter-spacing:.005em;
}
.v-iast{
  font-size:.78em;line-height:1.6;text-align:center;margin:0 0 .55em;
  color:var(--ink-soft);font-style:italic;
  font-family:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Times New Roman",serif;
}
.v-hi{
  font-size:.93em;line-height:1.72;margin:.35em 0 0;text-align:justify;
  padding:.6em .8em;border-radius:4px;background:rgba(140,28,19,.05);
  border:1px solid var(--rule);
}
.v-hi .lbl{color:var(--accent);font-weight:650;font-size:.86em;letter-spacing:.04em}
.v-en{font-size:.82em;line-height:1.6;margin:.45em 0 0;color:var(--ink-soft);font-style:italic;
  font-family:Georgia,"Times New Roman",serif}
.v-en .lbl{font-style:normal;font-weight:650;letter-spacing:.06em;font-size:.86em;opacity:.7}
mark{background:rgba(224,181,103,.55);color:inherit;border-radius:2px;padding:0 .1em}
html[data-theme="dark"] mark{background:rgba(217,167,92,.32)}

/* cover / title / part pages */
.cover-pg{
  position:absolute;inset:0;display:grid;place-content:center;text-align:center;
  padding:calc(var(--fs)*2);
  background:
    radial-gradient(90% 70% at 50% 12%,rgba(255,220,160,.20),transparent 60%),
    linear-gradient(160deg,var(--cover-a),var(--cover-b));
  color:#f4e3c4;
}
.cover-pg::before{
  content:"";position:absolute;inset:calc(var(--fs)*.9);
  border:1px solid rgba(217,178,106,.55);border-radius:3px;
  box-shadow:inset 0 0 0 3px rgba(0,0,0,.22),inset 0 0 0 4px rgba(217,178,106,.28);
}
.cover-pg .orn{width:min(46%,220px);margin:0 auto calc(var(--fs)*.9);display:block;opacity:.9}
.cover-pg h1{font-size:1.95em;line-height:1.25;margin:0 0 .35em;font-weight:650;letter-spacing:.01em}
.cover-pg .cs{font-size:.9em;opacity:.85;margin:0 0 1.4em}
.cover-pg .ca{font-size:.82em;letter-spacing:.14em;text-transform:uppercase;opacity:.7}
.title-pg{align-items:center;justify-content:center;text-align:center}
.part-pg-wrap{align-items:center;justify-content:center}
.part-pg{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;text-align:center;margin-top:-6%}
.part-pg .pn{font-size:.7em;letter-spacing:.28em;color:var(--accent);margin-bottom:1.1em}
.part-pg .orn{margin-bottom:1.1em;opacity:.75}
.part-pg h2{font-size:1.38em;margin:0 0 .55em}
.part-pg .pr{font-size:.84em;color:var(--ink-soft);max-width:26em;line-height:1.65}
.part-pg-wrap .folio-rule{margin-top:1.4em}

/* TOC inside the book */
.toc-page{display:flex;flex-direction:column}
.toc-row{
  display:flex;align-items:baseline;gap:.7em;width:100%;text-align:left;
  background:transparent;border:0;border-bottom:1px solid var(--rule);
  padding:.5em .2em;cursor:pointer;color:var(--ink);font:inherit;font-size:.9em;
}
.toc-row:hover{background:rgba(140,28,19,.07)}
.toc-row .tr-t{flex:1;line-height:1.45}
.toc-row .tr-p{font-size:.78em;color:var(--ink-soft);font-variant-numeric:tabular-nums}

/* ---------------- chrome ---------------- */
#topbar,#bottombar{
  background:var(--ui-bg);
  backdrop-filter:blur(14px) saturate(1.2);
  -webkit-backdrop-filter:blur(14px) saturate(1.2);
  border-bottom:1px solid var(--ui-line);
  z-index:30;
}
#topbar{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:8px 12px}
#bottombar{display:flex;align-items:center;gap:12px;padding:8px 14px calc(8px + env(safe-area-inset-bottom));border-bottom:0;border-top:1px solid var(--ui-line)}
.tb-left{display:flex;align-items:center;gap:10px;min-width:0}
.tb-right{display:flex;align-items:center;gap:4px;flex-wrap:nowrap}
.bookmark-label{min-width:0;display:flex;flex-direction:column;line-height:1.2}
#bkTitle{font-weight:620;font-size:.94em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#bkChapter{font-size:.74em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

.ibtn,.nbtn{
  width:38px;height:38px;border-radius:9px;border:1px solid transparent;background:transparent;
  display:grid;place-items:center;cursor:pointer;color:var(--ui-fg);
  transition:background .18s,border-color .18s,transform .12s;flex:0 0 auto;
}
.ibtn svg,.nbtn svg{width:21px;height:21px}
.ibtn:hover,.nbtn:hover{background:rgba(255,235,205,.10);border-color:var(--ui-line)}
.ibtn:active,.nbtn:active{transform:scale(.93)}
.ibtn:focus-visible,.nbtn:focus-visible,#track:focus-visible,.sw:focus-visible,.seg button:focus-visible{outline:2px solid var(--ui-accent);outline-offset:2px}
.ibtn.on{background:rgba(224,181,103,.18);border-color:rgba(224,181,103,.4);color:var(--ui-accent)}
.ibtn.off svg{opacity:.4}

.progress-wrap{flex:1;display:flex;align-items:center;gap:10px;min-width:0}
.track{position:relative;flex:1;height:22px;cursor:pointer;touch-action:none}
.track::before{content:"";position:absolute;left:0;right:0;top:50%;transform:translateY(-50%);height:4px;border-radius:99px;background:rgba(255,235,205,.14)}
.fill{position:absolute;left:0;top:50%;transform:translateY(-50%);height:4px;border-radius:99px;background:linear-gradient(90deg,var(--gold-dim),var(--ui-accent));width:0%}
.knob{position:absolute;top:50%;width:14px;height:14px;margin:-7px 0 0 -7px;border-radius:50%;background:var(--ui-accent);left:0%;box-shadow:0 2px 8px rgba(0,0,0,.5);transition:transform .15s}
.track:hover .knob{transform:scale(1.18)}
.prog-meta{display:flex;flex-direction:column;font-size:.72em;line-height:1.25;min-width:74px;text-align:right}

/* nav zones */
.nav-zone{position:absolute;top:0;bottom:0;width:18%;z-index:12;cursor:pointer}
.nav-prev{left:0}
.nav-next{right:0}
.nav-zone:hover::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(255,255,255,.05),transparent)}
.nav-next:hover::after{background:linear-gradient(270deg,rgba(255,255,255,.05),transparent)}

.hint{
  position:absolute;bottom:16px;left:50%;transform:translateX(-50%);
  background:var(--ui-bg);border:1px solid var(--ui-line);color:var(--ui-fg);
  padding:7px 14px;border-radius:99px;font-size:.78em;z-index:20;
  animation:hintIn .5s var(--ease);
}
@keyframes hintIn{from{opacity:0;transform:translate(-50%,8px)}}

/* quick exit */
#quickExit{
  position:fixed;right:14px;bottom:calc(66px + env(safe-area-inset-bottom));z-index:40;
  width:34px;height:34px;border-radius:50%;border:1px solid var(--ui-line);
  background:rgba(20,15,12,.62);color:rgba(242,231,213,.6);
  display:grid;place-items:center;cursor:pointer;backdrop-filter:blur(8px);
  transition:opacity .2s,color .2s,background .2s;opacity:.5;
}
#quickExit:hover{opacity:1;color:#fff;background:rgba(120,20,15,.85)}
#quickExit svg{width:17px;height:17px}

/* ---------------- panels ---------------- */
#scrim{position:fixed;inset:0;background:rgba(6,4,3,.62);backdrop-filter:blur(3px);z-index:50;animation:fade .22s ease}
@keyframes fade{from{opacity:0}}
.panel{
  position:fixed;top:0;bottom:0;width:min(400px,90vw);z-index:60;
  background:var(--panel);border:1px solid var(--ui-line);
  display:flex;flex-direction:column;
  box-shadow:0 30px 90px rgba(0,0,0,.6);
  transition:transform .3s var(--ease);
}
.panel.wide{width:min(560px,94vw)}
.panel-l{left:0;transform:translateX(-102%);border-left:0}
.panel-r{right:0;transform:translateX(102%);border-right:0}
.panel.open{transform:translateX(0)}
.panel-head{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:14px 16px;border-bottom:1px solid var(--ui-line);
  background:linear-gradient(180deg,var(--panel-2),var(--panel));
}
.panel-head h2{margin:0;font-size:1em;font-weight:640;letter-spacing:.02em}
.xbtn{background:transparent;border:0;color:var(--ui-muted);cursor:pointer;font-size:1.05em;padding:4px 8px;border-radius:7px}
.xbtn:hover{color:var(--ui-fg);background:rgba(255,235,205,.08)}
.panel-body{padding:14px 16px 26px;overflow:auto;flex:1;overscroll-behavior:contain}

/* TOC */
.toc-ch{
  display:flex;gap:10px;align-items:baseline;width:100%;text-align:left;
  background:transparent;border:0;border-bottom:1px solid var(--ui-line);
  padding:11px 6px;cursor:pointer;color:var(--ui-fg);transition:background .15s;
}
.toc-ch:hover{background:rgba(255,235,205,.06)}
.toc-ch .n{font-size:.72em;color:var(--ui-accent);min-width:2.2em;font-variant-numeric:tabular-nums}
.toc-ch .t{flex:1;font-size:.92em;line-height:1.45}
.toc-ch .p{font-size:.72em;color:var(--ui-muted);font-variant-numeric:tabular-nums}
.toc-ch.current{background:rgba(224,181,103,.12)}
.toc-ch.current .t{color:var(--ui-accent)}
.toc-prog{height:3px;background:rgba(255,235,205,.13);border-radius:99px;margin-top:10px;overflow:hidden}
.toc-prog i{display:block;height:100%;background:var(--ui-accent);width:0}

/* search */
#searchInput{
  width:100%;padding:11px 13px;border-radius:9px;font:inherit;font-size:.92em;
  background:var(--panel-2);border:1px solid var(--ui-line);color:var(--ui-fg);
}
#searchInput:focus{outline:none;border-color:var(--ui-accent)}
.search-opts{display:flex;gap:12px;margin:10px 0 4px;font-size:.78em;color:var(--ui-muted);flex-wrap:wrap}
.search-opts label{display:flex;gap:5px;align-items:center;cursor:pointer}
.results{margin-top:12px}
.res{
  width:100%;text-align:left;background:transparent;border:0;border-bottom:1px solid var(--ui-line);
  padding:10px 6px;cursor:pointer;color:var(--ui-fg);
}
.res:hover{background:rgba(255,235,205,.06)}
.res .rh{font-size:.72em;color:var(--ui-accent);letter-spacing:.06em;margin-bottom:3px}
.res .rb{font-size:.86em;line-height:1.5;color:var(--ui-muted)}
.res mark{background:rgba(224,181,103,.4);color:var(--ui-fg)}

/* bookmarks */
.bm{display:flex;gap:10px;align-items:center;border-bottom:1px solid var(--ui-line);padding:9px 4px}
.bm button.j{flex:1;text-align:left;background:transparent;border:0;color:var(--ui-fg);cursor:pointer;padding:0}
.bm .p{font-size:.74em;color:var(--ui-accent)}
.bm .s{font-size:.84em;color:var(--ui-muted);line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.bm .d{background:transparent;border:0;color:var(--ui-muted);cursor:pointer;padding:4px 6px;border-radius:6px}
.bm .d:hover{color:#e0715f;background:rgba(224,113,95,.12)}

/* settings */
.set-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 0;border-bottom:1px solid var(--ui-line);font-size:.88em}
.set-row>span:first-child{color:var(--ui-fg)}
.seg{display:flex;background:var(--panel-2);border:1px solid var(--ui-line);border-radius:9px;overflow:hidden}
.seg button{background:transparent;border:0;padding:7px 11px;cursor:pointer;color:var(--ui-muted);font-size:.86em}
.seg button.on{background:rgba(224,181,103,.2);color:var(--ui-accent)}
#fontSeg button:nth-child(1){font-size:.72em}
#fontSeg button:nth-child(2){font-size:.84em}
#fontSeg button:nth-child(3){font-size:.96em}
#fontSeg button:nth-child(4){font-size:1.1em}
#fontSeg button:nth-child(5){font-size:1.24em}
input[type=range]{width:150px;accent-color:var(--ui-accent)}
.sw{width:44px;height:25px;border-radius:99px;border:1px solid var(--ui-line);background:var(--panel-2);position:relative;cursor:pointer;transition:background .2s}
.sw i{position:absolute;top:2px;left:2px;width:19px;height:19px;border-radius:50%;background:var(--ui-muted);transition:transform .2s,background .2s}
.sw[aria-checked="true"]{background:rgba(224,181,103,.28)}
.sw[aria-checked="true"] i{transform:translateX(19px);background:var(--ui-accent)}

/* library */
.gen-box{background:var(--panel-2);border:1px solid var(--ui-line);border-radius:11px;padding:14px;margin-bottom:20px}
.gen-box h3,.lib-h{margin:0 0 10px;font-size:.95em;font-weight:640}
.lib-h{margin:6px 0 10px}
.gen-row{display:flex;gap:8px}
#topicInput{flex:1;min-width:0;padding:11px 12px;border-radius:9px;font:inherit;font-size:.9em;background:var(--panel);border:1px solid var(--ui-line);color:var(--ui-fg)}
#topicInput:focus{outline:none;border-color:var(--ui-accent)}
button.primary{
  padding:10px 16px;border-radius:9px;border:0;cursor:pointer;font-weight:620;font-size:.88em;
  background:linear-gradient(180deg,#c2913f,#9a6f28);color:#1c130a;
  box-shadow:0 3px 12px rgba(194,145,63,.3);
}
button.primary:hover{filter:brightness(1.08)}
button.primary:disabled{opacity:.5;cursor:progress}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.chip{background:transparent;border:1px solid var(--ui-line);color:var(--ui-muted);border-radius:99px;padding:5px 11px;font-size:.76em;cursor:pointer}
.chip:hover{color:var(--ui-accent);border-color:rgba(224,181,103,.4)}
.lib-list{display:grid;gap:10px}
.lib-card{
  display:flex;gap:12px;align-items:center;text-align:left;width:100%;
  background:var(--panel-2);border:1px solid var(--ui-line);border-radius:11px;padding:12px;cursor:pointer;
  transition:border-color .18s,transform .12s;
}
.lib-card:hover{border-color:rgba(224,181,103,.45)}
.lib-card:active{transform:scale(.99)}
.lib-thumb{width:44px;height:60px;border-radius:3px 6px 6px 3px;flex:0 0 auto;position:relative;overflow:hidden;
  box-shadow:inset -4px 0 8px rgba(0,0,0,.45),2px 3px 10px rgba(0,0,0,.4)}
.lib-meta{min-width:0;flex:1}
.lib-meta .t{font-size:.92em;font-weight:620;margin-bottom:3px}
.lib-meta .d{font-size:.74em;color:var(--ui-muted);line-height:1.45}
.lib-del{background:transparent;border:0;color:var(--ui-muted);cursor:pointer;padding:6px;border-radius:7px}
.lib-del:hover{color:#e0715f}
.lib-badge{font-size:.64em;letter-spacing:.08em;padding:2px 7px;border-radius:99px;border:1px solid rgba(121,179,155,.5);color:var(--accent-2);margin-left:6px;vertical-align:middle}

/* view options */
.vopt{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:11px 0;border-bottom:1px solid var(--ui-line);font-size:.88em}

/* toast */
#toast{
  position:fixed;left:50%;bottom:calc(84px + env(safe-area-inset-bottom));transform:translate(-50%,14px);
  background:var(--ui-bg);border:1px solid var(--ui-line);color:var(--ui-fg);
  padding:10px 18px;border-radius:99px;font-size:.84em;z-index:80;
  opacity:0;pointer-events:none;transition:opacity .25s,transform .25s var(--ease);
  backdrop-filter:blur(12px);max-width:80vw;text-align:center;
}
#toast.show{opacity:1;transform:translate(-50%,0)}

/* ---------------- neutral (quick exit) page ---------------- */
#neutral[hidden]{display:none!important}
#neutral{
  position:fixed;inset:0;z-index:200;display:flex;background:#f2f2f0;color:#26261f;
  font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  display:flex;flex-direction:column;
}
.neu-bar{display:flex;align-items:center;gap:9px;padding:11px 16px;background:#e6e6e2;border-bottom:1px solid #d4d4cf}
.neu-dot{width:9px;height:9px;border-radius:50%;background:#8a8a82}
.neu-title{font-weight:600;font-size:.95em}
.neu-time{margin-left:auto;font-size:.82em;color:#6b6b63}
.neu-sheet{margin:26px auto;max-width:560px;width:calc(100% - 32px);background:#fff;border:1px solid #e0e0da;border-radius:12px;padding:24px 26px;
  background-image:repeating-linear-gradient(180deg,transparent 0 27px,#eef0f4 27px 28px)}
.neu-sheet h1{margin:0 0 16px;font-size:1.15em;color:#3a3a33}
.neu-sheet ul{margin:0;padding-left:20px;line-height:28px;font-size:.95em;color:#4a4a42}
.neu-note{margin:20px 0 0;font-size:.82em;color:#8a8a82}
#neuBack{
  position:absolute;right:16px;bottom:16px;width:38px;height:38px;border-radius:50%;
  border:1px solid #d4d4cf;background:#fff;color:#8a8a82;cursor:pointer;font-size:1.1em;opacity:.55;
}
#neuBack:hover{opacity:1}

/* ---------------- fullscreen ---------------- */
body.fullscreen #topbar,body.fullscreen #bottombar{
  opacity:0;pointer-events:none;transform:translateY(-8px);transition:opacity .3s,transform .3s;
}
body.fullscreen #topbar.show,body.fullscreen #bottombar.show{opacity:1;pointer-events:auto;transform:none}
body.fullscreen #quickExit{bottom:20px}

/* ---------------- responsive ---------------- */
@media (max-width:860px){
  :root{--fs:16px}
  #scene{padding:14px 10px}
  .edge{width:12px}
  .bookmark-label{display:none}
  .prog-meta{min-width:60px}
  .ibtn{width:36px;height:36px}
  .nav-zone{width:24%}
}
@media (max-width:560px){
  .ibtn svg,.nbtn svg{width:19px;height:19px}
  #bkChapter{display:none}
  .pg{padding:calc(var(--fs)*1.9) calc(var(--fs)*1.5) calc(var(--fs)*2.2)}
  .pg-back{padding-left:calc(var(--fs)*1.5);padding-right:calc(var(--fs)*1.5)}
  .cover-pg h1{font-size:1.5em}
  .panel{width:100vw}
  .panel.wide{width:100vw}
  .progress-wrap{gap:6px}
  .prog-meta{display:none}
}
@media (prefers-reduced-motion:reduce){
  :root{--flip:120ms}
  .leaf.turning .sweep,.leaf.cast-on .cast{animation:none;opacity:0}
  *{scroll-behavior:auto!important}
}


/* --- book internals used by JS --- */
.leaves{position:absolute;inset:0;transform-style:preserve-3d;pointer-events:none}
.leaf{pointer-events:auto}
.cover-pg .orn{color:var(--gold)}
.part-pg .orn{color:var(--accent)}
.title-pg .orn{color:var(--accent);opacity:.8}
.illus{color:var(--accent);opacity:.85}
.v-num{font-variant-numeric:tabular-nums}
.v-head{border-bottom:1px solid var(--rule);padding-bottom:.3em;margin-bottom:.55em}