/* Pop-up book viewer — all rules are scoped under .pb so they won't touch the host app.
   Theme with the custom properties on .pb (colors, fonts). */
.pb{position:relative;width:100%;height:100%;overflow:hidden;font-family:var(--f-ui);color:var(--ink);-webkit-user-select:none;user-select:none}
.pb *{box-sizing:content-box}
.pb .pick,.pb .pick *{box-sizing:border-box}
.pb{
  --wall:#ebe7e1; --wall-2:#d9d3ca; --floor:#cfe6f3; --floor-2:#a9cfe6;
  --paper:#f7f4ec; --paper-ink:#2b2a2e; --cloth:#e3e4e1; --edge:#efe9dc; --edge-line:#d4cab5;
  --ink:#2b2a2e; --muted:#6c675f; --card:#ffffffeb; --chip:#ffffffd9; --chip-line:#00000014; --teal:#2f6f73;
  --f-story:"Helvetica Neue",Helvetica,Arial,"Noto Sans KR","Noto Sans SC","Noto Sans JP","Noto Sans Devanagari","Noto Sans Bengali","Noto Sans Arabic","Noto Sans Thai",sans-serif; --f-cover:"Helvetica Neue",Helvetica,Arial,sans-serif; --f-ui:"Figtree",system-ui,sans-serif;
}
@media (prefers-color-scheme: dark){.pb:not([data-theme="light"]){--wall:#2b2a2f;--wall-2:#1d1c21;--floor:#2c4656;--floor-2:#1c2f3b;--ink:#ece8e1;--muted:#aaa49a;--card:#1f2a33eb;--chip:#1f1e23e0;--chip-line:#ffffff1a;color-scheme:dark}
}
.pb[data-theme="dark"]{--wall:#2b2a2f;--wall-2:#1d1c21;--floor:#2c4656;--floor-2:#1c2f3b;--ink:#ece8e1;--muted:#aaa49a;--card:#1f2a33eb;--chip:#1f1e23e0;--chip-line:#ffffff1a;color-scheme:dark}
.pb{position:relative;height:100%;overflow:hidden;
  background:radial-gradient(60% 45% at 50% 30%,#ffffff40,transparent 70%),
    linear-gradient(to bottom,var(--wall) 0,var(--wall-2) 46%,var(--floor) 46.2%,var(--floor-2) 100%);
  cursor:grab;touch-action:none}
.pb.dragging{cursor:grabbing}
.pb .stage{position:absolute;inset:0;perspective:1700px;perspective-origin:50% 38%}
.pb .orbit{position:absolute;left:50%;top:54%;width:0;height:0;transform-style:preserve-3d}
.pb .book{position:absolute;left:0;top:calc(var(--ph)/-2);width:0;height:var(--ph);transform-style:preserve-3d}
.pb .floorshadow{position:absolute;left:calc(var(--pw)*-1.25);top:-8%;width:calc(var(--pw)*2.5);height:116%;border-radius:50%;
  background:radial-gradient(closest-side,#00000059,#0000 100%);filter:blur(8px);transform:translateZ(calc(var(--T)*-1 - var(--bt) - 3px))}
.pb .leaf{position:absolute;left:0;top:0;width:var(--pw);height:var(--ph);transform-origin:left center;transform-style:preserve-3d;transition:transform 1.15s cubic-bezier(.45,.05,.25,1)}
.pb .leaf.board{top:-2.4%;height:104.8%;width:calc(var(--pw)*1.032)}
.pb .face{position:absolute;inset:0;backface-visibility:hidden;overflow:hidden;background:var(--paper);color:var(--paper-ink)}
.pb .face.front{transform:translateZ(.4px);border-radius:1px 4px 4px 1px}
.pb .face.back{transform:rotateY(180deg) translateZ(.4px);border-radius:4px 1px 1px 4px}
.pb .face.front::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,#0000001f,#0000 10%);pointer-events:none}
.pb .face.back::after{content:"";position:absolute;inset:0;background:linear-gradient(270deg,#0000001f,#0000 10%);pointer-events:none}
.pb .leaf.board .face{background:var(--cloth)}
.pb .leaf.board .face.front{transform:translateZ(calc(var(--bt)/2))}
.pb .leaf.board .face.back{transform:rotateY(180deg) translateZ(calc(var(--bt)/2))}
.pb .edge{position:absolute;background:#f8f6f1}
.pb .blk.side,.pb .blk.tb{background-color:#fff}
.pb .edge.r{top:0;bottom:0;right:0;width:var(--bt);transform-origin:right center;transform:translateZ(calc(var(--bt)/-2)) rotateY(90deg)}
.pb .edge.t{left:0;right:0;top:0;height:var(--bt);transform-origin:center top;transform:translateZ(calc(var(--bt)/-2)) rotateX(90deg)}
.pb .edge.b{left:0;right:0;bottom:0;height:var(--bt);transform-origin:center bottom;transform:translateZ(calc(var(--bt)/-2)) rotateX(-90deg)}
.pb .blk{position:absolute;transition:all 1.15s cubic-bezier(.45,.05,.25,1)}
.pb .blk.side{top:.4%;bottom:.4%;background:repeating-linear-gradient(90deg,#fff 0 1.6px,#f1eee8 1.6px 2.4px)}
.pb .blk.tb{background:repeating-linear-gradient(0deg,#fff 0 1.6px,#f1eee8 1.6px 2.4px)}
.pb .blk.r.side{left:calc(var(--pw) - var(--tR));width:var(--tR);transform-origin:right center;transform:translateZ(var(--zR)) rotateY(90deg)}
.pb .blk.r.top{left:0;width:var(--pw);top:.4%;height:var(--tR);transform-origin:center top;transform:translateZ(var(--zR)) rotateX(90deg)}
.pb .blk.r.bot{left:0;width:var(--pw);bottom:.4%;height:var(--tR);transform-origin:center bottom;transform:translateZ(var(--zR)) rotateX(-90deg)}
.pb .blk.l.side{left:calc(var(--pw)*-1);width:var(--tL);transform-origin:left center;transform:translateZ(var(--zL)) rotateY(-90deg)}
.pb .blk.l.top{left:calc(var(--pw)*-1);width:var(--pw);top:.4%;height:var(--tL);transform-origin:center top;transform:translateZ(var(--zL)) rotateX(90deg)}
.pb .blk.l.bot{left:calc(var(--pw)*-1);width:var(--pw);bottom:.4%;height:var(--tL);transform-origin:center bottom;transform:translateZ(var(--zL)) rotateX(-90deg)}
.pb .cover{position:absolute;inset:0;background:var(--cloth) var(--pb-cover,none) center bottom/100% 100% no-repeat;font-family:var(--f-cover);color:#2b2a2e}
.pb .cover .t{position:absolute;top:7.2%;left:8%;right:8%;display:flex;flex-direction:column;gap:calc(var(--pw)*.022)}
.pb .cover h1{margin:0;font:700 calc(var(--pw)*.135)/.92 var(--f-cover);letter-spacing:-.035em}
.pb .cover .sub{margin:0;font-size:calc(var(--pw)*.031);color:var(--teal)}
.pb .cover .cred,.pb .credits{display:flex;flex-direction:column;gap:.35em;font:500 calc(var(--pw)*.02)/1.2 var(--f-cover);letter-spacing:.08em;text-transform:uppercase}
.pb .endpaper{position:absolute;inset:0;background:radial-gradient(circle at 30% 30%,#2f6f7322 1.5px,#0000 2px) 0 0/16px 16px,radial-gradient(circle at 70% 70%,#e8798f26 1.5px,#0000 2px) 0 0/16px 16px,#f1ede4}
.pb .titlepage{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:flex-end;gap:calc(var(--pw)*.03);padding:0 10% 14%;font-family:var(--f-cover)}
.pb .titlepage h2{margin:0;font:700 calc(var(--pw)*.1)/.95 var(--f-cover);letter-spacing:-.03em;text-wrap:balance}
.pb .titlepage h2{overflow-wrap:anywhere}
.pb .cover h1{overflow-wrap:anywhere}
.pb .titlepage p{margin:0;font-size:calc(var(--pw)*.034);color:var(--teal)}
.pb .words{position:absolute;left:9%;right:9%;bottom:7%;font:calc(var(--pw)*.052)/1.32 var(--f-story);text-wrap:pretty;white-space:pre-line}
.pb .words.big{font-size:calc(var(--pw)*.1125);font-weight:700;letter-spacing:-.03em;text-align:center;bottom:40%}
.pb .folio{position:absolute;bottom:3%;font:500 calc(var(--pw)*.026) var(--f-ui);color:#9a948a}
.pb .face.front .folio{right:6%}
.pb .face.back .folio{left:6%}
.pb .scene{position:absolute;left:calc(var(--pw)*-1);width:calc(var(--pw)*2);top:0;height:var(--ph);transform-style:preserve-3d;transform:translateZ(1.2px);pointer-events:none}
.pb .flat{position:absolute;transform-style:preserve-3d;transform-origin:50% 100%;transform:rotateX(0deg);opacity:0;
  transition:transform .55s cubic-bezier(.5,0,.7,.2),opacity .35s .2s}
.pb .scene.up .flat{opacity:1;transform:rotateX(calc(var(--lean,-54deg))) translateZ(var(--tz,0px));transition:transform 1.1s cubic-bezier(.2,1.25,.4,1) var(--delay,0s),opacity .3s var(--delay,0s)}
.pb .flat img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;object-position:50% 100%;max-width:none;backface-visibility:hidden;
  filter:drop-shadow(0 calc(var(--pw)*.01) calc(var(--pw)*.012) #0000004d)}
.pb .flat .back{position:absolute;inset:0;background:var(--b) center bottom/contain no-repeat;transform:rotateY(180deg);backface-visibility:hidden;filter:brightness(0) opacity(.12)}
.pb .shade{position:absolute;height:calc(var(--ph)*.06);border-radius:50%;background:radial-gradient(closest-side,#0000003d,#0000);opacity:0;transition:opacity .4s}
.pb .scene.up .shade{opacity:1;transition:opacity .8s var(--delay,0s)}
.pb .spring svg{position:absolute;left:50%;bottom:0;transform:translateX(-50%);overflow:visible}
.pb .spring .bob{position:absolute;left:0;right:0;animation:pb-bob var(--dur,2.4s) ease-in-out infinite}
.pb .spring .bob img{position:static;width:100%;height:auto}
@keyframes pb-bob{0%,100%{transform:translateY(0) rotate(-4deg)}50%{transform:translateY(-6%) rotate(4deg)}}
.pb .cloud .hang{position:absolute;top:var(--top);transform-origin:50% 0;animation:pb-sway var(--dur,3.6s) ease-in-out infinite}
.pb .cloud .hang i{display:block;margin:0 auto;width:1px;height:var(--len);background:#7a7280}
.pb .cloud .hang img{position:static;display:block;width:100%;height:auto;margin-top:-2px}
@keyframes pb-sway{0%,100%{transform:rotate(-6deg)}50%{transform:rotate(6deg)}}
.pb .cloud .petal{position:absolute;top:20%;border-radius:50% 0 50% 50%;animation:pb-fall var(--dur) linear var(--dl) infinite;opacity:0}
@keyframes pb-fall{0%{transform:translateY(0) rotate(0);opacity:0}10%{opacity:1}88%{opacity:1}100%{transform:translateY(calc(var(--pw)*1.15)) rotate(340deg);opacity:0}}
.pb .storycard{height:auto!important;top:auto!important;background:#fffaf1;border-radius:calc(var(--pw)*.025);
  box-shadow:0 calc(var(--pw)*.012) calc(var(--pw)*.03) #0000002e,inset 0 0 0 1px #e8dfcf;padding:calc(var(--pw)*.035) calc(var(--pw)*.05)}
.pb .storycard .words{position:static;font:400 calc(var(--pw)*.0625)/1.32 var(--f-story);letter-spacing:-.005em;text-align:center;color:var(--paper-ink);text-wrap:balance}
.pb .stage{transform-origin:50% 50%}
.pb .zoom{display:inline-flex;gap:4px}
.pb .lang{font:500 14px var(--f-ui);color:var(--ink);background:var(--chip);border:1px solid var(--chip-line);border-radius:999px;padding:9px 12px;cursor:pointer}
.pb [lang=ur] .words,.pb [lang=ur].words{font-family:"Noto Nastaliq Urdu",serif;line-height:2.1}
.pb [lang=ar] .words,.pb [lang=ar].words{line-height:1.7}
.pb .cover [dir=rtl],.pb .titlepage[dir=rtl]{text-align:right}
.pb .flat .clip{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;box-sizing:border-box;border:calc(var(--pw)*.014) solid #fffaf1;border-radius:calc(var(--pw)*.012);
  background:#fffaf1;backface-visibility:hidden;box-shadow:0 calc(var(--pw)*.015) calc(var(--pw)*.04) #00000040}
.pb .flat .clipback{position:absolute;inset:0;background:#efe9dc;border-radius:calc(var(--pw)*.012);transform:rotateY(180deg);backface-visibility:hidden}
.pb .scene{visibility:hidden}
.pb .scene.up,.pb .scene.folding{visibility:visible}
.pb .playbtn{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:calc(var(--pw)*.22);height:calc(var(--pw)*.22);border-radius:50%;border:0;
  background:#ffffffe0;box-shadow:0 4px 18px #0004;display:none;align-items:center;justify-content:center;pointer-events:auto;cursor:pointer;backface-visibility:hidden}
.pb .playbtn svg{width:42%;height:42%;margin-left:8%}
.pb .needtap .playbtn{display:flex}
.pb .pb-caption{position:absolute;left:0;right:0;display:flex;justify-content:center;align-items:center;pointer-events:none;
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));z-index:2;transition:opacity .45s}
.pb .pb-caption.fade{opacity:0}
.pb .pb-caption .cap{max-width:30em;font:500 clamp(21px,5.4vw,40px)/1.32 var(--f-story);letter-spacing:-.01em;color:var(--ink);text-align:center;white-space:pre-line;text-wrap:balance}
.pb .pb-caption .cap small{display:block;margin-top:.5em;font:500 max(12px,.42em)/1.4 var(--f-ui);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.pb .pb-caption .cap b{display:block;font-weight:700;letter-spacing:-.03em}
.pb .pb-caption:empty{display:none}
.pb:not(.lay-book) .storycard{display:none}
.pb.lay-book .pb-caption{display:none}
.pb.lay-a .pb-caption{top:60%;bottom:var(--barH)}
.pb.lay-b .pb-caption{top:59%;bottom:var(--barH)}
.pb.lay-b .pb-caption .cap{background:var(--card);border-radius:22px;padding:.7em 1em;box-shadow:0 10px 30px #1b3a5326}
.pb.lay-b .floorshadow{display:none}
.pb.lay-b .stage::after{content:"";position:absolute;left:50%;top:var(--shadowY,52%);width:min(70vw,560px);height:28px;transform:translateX(-50%);border-radius:50%;
  background:radial-gradient(closest-side,#1b3a5340,#0000);animation:pb-shadowpulse 6s ease-in-out infinite}
@keyframes pb-shadowpulse{50%{transform:translateX(-50%) scale(.86);opacity:.7}}
.pb.lay-c .pb-caption{top:60%;bottom:var(--barH)}
.pb.lay-c .pb-caption .cap{text-align:left}
.pb.lay-c.wide .pb-caption{left:54%;right:0;top:10%;justify-content:flex-start;padding-right:max(32px,5vw)}
.pb.lay-c.wide .pb-caption .cap{font-size:clamp(22px,2.7vw,44px);max-width:16em}
.pb.lay-d .pb-caption{bottom:var(--barH);top:auto;padding-top:16px;padding-bottom:16px}
.pb.lay-d .pb-caption .cap{background:#1d2b36d9;color:#fff;border-radius:16px;padding:.55em .9em;font-size:clamp(19px,4.6vw,34px)}
.pb.lay-d .pb-caption .cap small{color:#cfe0ea}
.pb.lay-e .pb-caption{top:calc(12px + env(safe-area-inset-top,0px));bottom:auto;min-height:24%}
.pb.lay-e .hint{display:none}
.pb .lay{font:500 14px var(--f-ui);color:var(--ink);background:var(--chip);border:1px solid var(--chip-line);border-radius:999px;padding:9px 12px;cursor:pointer}
.pb [data-tip]{position:relative}
.pb [data-tip]::after{content:attr(data-tip);position:absolute;left:50%;bottom:calc(100% + 9px);transform:translate(-50%,4px);white-space:nowrap;
  font:500 12px/1 var(--f-ui);letter-spacing:.02em;color:#fff;background:#1d2b36;padding:7px 10px;border-radius:8px;box-shadow:0 4px 14px #0003;
  opacity:0;pointer-events:none;transition:opacity .15s,transform .15s;z-index:5}
.pb [data-tip]::before{content:"";position:absolute;left:50%;bottom:calc(100% + 3px);transform:translateX(-50%);border:6px solid transparent;border-top-color:#1d2b36;border-bottom:0;
  opacity:0;pointer-events:none;transition:opacity .15s;z-index:5}
@media (hover:hover){.pb [data-tip]:hover::after{opacity:1;transform:translate(-50%,0);transition-delay:.25s}
.pb [data-tip]:hover::before{opacity:1;transition-delay:.25s}
}
.pb [data-tip]:focus-visible::after,.pb [data-tip]:focus-within::after,.pb [data-tip].tipshow::after{opacity:1;transform:translate(-50%,0)}
.pb [data-tip]:focus-visible::before,.pb [data-tip]:focus-within::before,.pb [data-tip].tipshow::before{opacity:1}
.pb .bar{flex-direction:column;gap:8px}
.pb .bar .row{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap}
@media (min-width:900px){.pb .bar{flex-direction:row;gap:18px}
}
.pb .btn.icon{width:44px;height:44px;padding:0;justify-content:center}
.pb .btn.icon svg{width:21px;height:21px}
.pb .btn.icon[aria-pressed="false"]{color:var(--muted)}
.pb .btn,.pb .pick{transition:background-color .18s,color .18s,border-color .18s,transform .12s}
.pb .btn:active:not([disabled]),.pb .btn.flash,.pb .btn[aria-pressed="true"],.pb .pick:focus-within,.pb .pick.flash{background:var(--teal);border-color:var(--teal);color:#fff}
.pb .pick:focus-within .chev,.pb .pick.flash .chev{color:#ffffffcc}
.pb .btn:active:not([disabled]){transform:scale(.94)}
.pb .btn.zoomed{border-color:var(--teal);color:var(--teal)}
.pb .btn:hover:not([disabled]):not([aria-pressed="true"]):not(.flash){background:var(--chip-hover,#fff)}
.pb .pick{position:relative;display:inline-flex;align-items:center;gap:6px;height:44px;box-sizing:border-box;padding:0 10px 0 13px;color:var(--ink);background:var(--chip);border:1px solid var(--chip-line);border-radius:999px;backdrop-filter:blur(6px);cursor:pointer}
.pb .pick>svg{width:19px;height:19px;flex:none}
.pb .pick .chev{width:15px;height:15px;pointer-events:none;color:var(--muted)}
.pb .pick select{appearance:none;-webkit-appearance:none;background:transparent;border:0;padding:0;margin:0;font:500 14px var(--f-ui);color:inherit;cursor:pointer;max-width:9.5em}
.pb .pick:focus-within{outline:2px solid var(--teal);outline-offset:2px}
.pb .book.closed .leaf .face.front,.pb .book.closed .leaf .face.back{visibility:hidden}
.pb .book.closed .leaf.frontboard .face.front{visibility:visible}
.pb .book.done .leaf .face.front,.pb .book.done .leaf .face.back{visibility:hidden}
.pb .book.done .leaf.backboard .face.back{visibility:visible}
.pb .hint{transition:opacity .8s}
.pb.quiet .hint{opacity:0}
.pb .book.closed .blk.r.bot{bottom:-2.4%;width:calc(var(--pw)*1.032)}
.pb .book.closed .blk.r.top{top:-2.4%;width:calc(var(--pw)*1.032)}
.pb .book.closed .blk.r.side{top:-2.4%;bottom:-2.4%;left:calc(var(--pw)*1.032 - var(--tR))}
.pb .book.done .blk.l.bot{bottom:-2.4%;left:calc(var(--pw)*-1.032);width:calc(var(--pw)*1.032)}
.pb .book.done .blk.l.top{top:-2.4%;left:calc(var(--pw)*-1.032);width:calc(var(--pw)*1.032)}
.pb .book.done .blk.l.side{top:-2.4%;bottom:-2.4%;left:calc(var(--pw)*-1.032)}
.pb .cloud.side .swing{position:absolute;top:0;left:0;right:0;transform-origin:50% 0;animation:pb-sway var(--dur,4s) ease-in-out infinite;display:flex;flex-direction:column;align-items:center}
.pb .cloud.side .swing>i{display:block;width:1px;background:linear-gradient(#7a728000,#7a7280 40%)}
.pb .cloud.side .swing>img{position:static;height:auto;filter:drop-shadow(0 6px 10px #0000001f)}
.pb .cloud.side .dangle{display:flex;flex-direction:column;align-items:center;margin-top:-6%;transform-origin:50% 0;animation:pb-sway calc(var(--dur,4s)*.8) ease-in-out infinite reverse}
.pb .cloud.side .dangle i{display:block;width:1px;background:#7a7280}
.pb .cloud.side .dangle img{position:static;height:auto}
@media (prefers-reduced-motion:reduce){.pb .cloud.side .swing,.pb .cloud.side .dangle{animation:none}
}
.pb .bar{position:absolute;left:0;right:0;bottom:0;display:flex;justify-content:center;align-items:center;gap:10px;flex-wrap:wrap;
  padding-block:12px calc(14px + env(safe-area-inset-bottom,0px));padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));pointer-events:none}
.pb .bar>*{pointer-events:auto}
.pb .btn{font:500 14px var(--f-ui);color:var(--ink);background:var(--chip);border:1px solid var(--chip-line);border-radius:999px;padding:9px 16px;cursor:pointer;backdrop-filter:blur(6px);display:inline-flex;align-items:center;gap:6px}
.pb .btn:focus-visible{outline:2px solid var(--teal);outline-offset:2px}
.pb .btn[disabled]{opacity:.45;cursor:default}
.pb .btn.round{width:44px;height:44px;padding:0;justify-content:center;font-size:18px}
.pb .where{min-width:150px;text-align:center;font:500 13px var(--f-ui);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.pb .hint{position:absolute;top:calc(14px + env(safe-area-inset-top,0px));left:0;right:0;text-align:center;font:500 12px var(--f-ui);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);pointer-events:none;
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.pb .btn svg{width:16px;height:16px}
@media (prefers-reduced-motion:reduce){.pb .spring .bob,.pb .cloud .hang,.pb .cloud .petal{animation:none!important}
.pb .leaf,.pb .flat,.pb .blk{transition-duration:.01s!important}
}


/* compact mode (editor preview): page arrows only, smaller caption */
.pb.compact .row.tools,.pb.compact .hint{display:none}
.pb.compact .pb-caption .cap{font-size:clamp(15px,3vw,24px)}
.pb.compact .where{min-width:110px}