/* ---------- App-style flipbook page: dark canvas, menu, the book — nothing else ---------- */
html, body{height:100%}
html{scrollbar-gutter:stable}
body{
  overflow:hidden;
  background:radial-gradient(1200px 700px at 50% 30%, #14181f 0%, var(--hero) 55%, #07090c 100%);
}
body > .site-header{margin-top:14px}
.site-header{z-index:1100}
.drawer{z-index:12000}

/* ---------- Loading / error overlay ---------- */
#loader{
  position:fixed;inset:0;z-index:900;
  background:radial-gradient(1200px 700px at 50% 30%, #14181f 0%, var(--hero) 55%, #07090c 100%);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:26px;
  transition:opacity .45s var(--ease);
}
#loader.hidden{opacity:0;pointer-events:none}
.ld-book{width:78px;height:56px;position:relative;perspective:420px}
.ld-book::before,.ld-book::after{
  content:"";position:absolute;top:0;width:38px;height:56px;background:#fff;
  border-radius:2px;box-shadow:0 8px 22px rgba(0,0,0,.55);
}
.ld-book::before{left:0;transform-origin:right center;animation:ldL 1.6s ease-in-out infinite}
.ld-book::after{right:0;transform-origin:left center;animation:ldR 1.6s ease-in-out infinite}
@keyframes ldL{0%,100%{transform:rotateY(24deg)}50%{transform:rotateY(38deg)}}
@keyframes ldR{0%,100%{transform:rotateY(-24deg)}50%{transform:rotateY(-38deg)}}
.ld-eyebrow{
  font-size:11px;letter-spacing:.24em;text-transform:uppercase;
  color:var(--gold-2);font-weight:700;
}
.ld-title{font-family:var(--serif);font-size:clamp(26px,3.4vw,40px);font-weight:400;color:#fff;text-align:center}
.ld-title em{font-style:italic;color:rgba(255,255,255,.55)}
.ld-sub{font-size:13px;color:rgba(255,255,255,.5)}
.ld-bar{width:min(300px,70vw);height:3px;border-radius:99px;background:rgba(255,255,255,.12);overflow:hidden}
.ld-bar i{display:block;height:100%;width:0;background:#fff;border-radius:99px;transition:width .25s}
#loader.error .ld-book,#loader.error .ld-bar{display:none}

/* ---------- Stage / book ---------- */
#stage{
  position:fixed;inset:0;overflow:auto;display:none;
  scrollbar-width:thin;scrollbar-color:rgba(255,255,255,.2) transparent;
}
body.ready #stage{display:block}
body.thumbs-open #stageInner{padding-left:250px}
@media (max-width:980px){ body.thumbs-open #stageInner{padding-left:12px} }
#stageInner{
  min-width:100%;min-height:100%;
  display:flex;align-items:center;justify-content:center;
  padding:118px 90px 108px;
}
#book{position:relative;display:flex;perspective:2600px;filter:drop-shadow(0 26px 54px rgba(0,0,0,.6))}
.page-slot{position:relative;background:#fff;overflow:hidden;flex:none}
.page-slot.blank{background:transparent;box-shadow:none}
.page-slot canvas{display:block;width:100%;height:100%}
#slotL{border-radius:4px 0 0 4px}
#slotR{border-radius:0 4px 4px 0}
#slotL::after,#slotR::after{content:"";position:absolute;top:0;bottom:0;width:5%;pointer-events:none;z-index:2}
#slotL::after{right:0;background:linear-gradient(to left, rgba(0,0,0,.18), transparent)}
#slotR::after{left:0;background:linear-gradient(to right, rgba(0,0,0,.14), transparent)}
.page-slot.blank::after{display:none}

#flipper{position:absolute;top:0;height:100%;width:50%;z-index:5;transform-style:preserve-3d;will-change:transform}
#flipper.fwd{left:50%;transform-origin:left center}
#flipper.bwd{left:0;transform-origin:right center}
.face{position:absolute;inset:0;background:#fff;overflow:hidden;backface-visibility:hidden;-webkit-backface-visibility:hidden}
.face canvas{display:block;width:100%;height:100%}
.face.back{transform:rotateY(180deg)}
.face .sheen{position:absolute;inset:0;pointer-events:none}
#flipper.fwd .face.front .sheen{background:linear-gradient(to right, rgba(0,0,0,.16), transparent 30%)}
#flipper.fwd .face.back  .sheen{background:linear-gradient(to left , rgba(0,0,0,.22), transparent 45%)}
#flipper.bwd .face.front .sheen{background:linear-gradient(to left , rgba(0,0,0,.16), transparent 30%)}
#flipper.bwd .face.back  .sheen{background:linear-gradient(to right, rgba(0,0,0,.22), transparent 45%)}

/* Page-turn arrows — flanking the book */
.edge{
  position:fixed;top:50%;transform:translateY(-50%);z-index:20;
  display:flex;align-items:center;cursor:pointer;
}
.edge.left{left:16px}
.edge.right{right:16px}
.edge .chip{
  width:46px;height:46px;border-radius:99px;
  background:rgba(15,18,24,.82);border:1px solid rgba(255,255,255,.18);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  display:grid;place-items:center;
  box-shadow:0 10px 26px rgba(0,0,0,.45);
  transition:background .2s,border-color .2s,transform .2s;
}
.edge:hover .chip{background:rgba(255,255,255,.16);border-color:rgba(255,255,255,.45);transform:scale(1.06)}
.edge svg{width:20px;height:20px;stroke:#fff}
.edge.disabled{display:none}

/* ---------- Bottom toolbar ---------- */
#toolbar{
  position:fixed;left:50%;bottom:18px;transform:translateX(-50%);z-index:30;
  display:flex;align-items:center;gap:4px;padding:8px 10px;
  background:rgba(15,18,24,.94);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border:1px solid rgba(255,255,255,.13);border-radius:14px;
  box-shadow:0 12px 34px rgba(0,0,0,.5);
  opacity:0;pointer-events:none;transition:opacity .3s;
  max-width:calc(100vw - 20px);
}
body.ready #toolbar{opacity:1;pointer-events:auto}
.tool{
  width:38px;height:38px;border:none;background:none;color:rgba(255,255,255,.6);
  border-radius:9px;cursor:pointer;display:flex;align-items:center;justify-content:center;
  flex:none;text-decoration:none;
}
.tool:hover{background:rgba(255,255,255,.09);color:#fff}
.tool.active{color:#fff;background:rgba(255,255,255,.12)}
.tool svg{width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.sep{width:1px;height:22px;background:rgba(255,255,255,.14);margin:0 6px;flex:none}
#pageBox{display:flex;align-items:center;gap:8px;padding:0 8px;font-size:13px;color:rgba(255,255,255,.6);font-variant-numeric:tabular-nums;flex:none}
#pageInput{
  width:56px;background:rgba(0,0,0,.4);border:1px solid rgba(255,255,255,.16);border-radius:7px;
  color:#fff;font:inherit;font-size:13px;text-align:center;padding:6px 4px;
}
#pageInput:focus{outline:none;border-color:rgba(255,255,255,.5)}
#zoomLabel{font-size:12.5px;color:rgba(255,255,255,.6);width:44px;text-align:center;font-variant-numeric:tabular-nums;flex:none}

#slider{
  position:fixed;left:50%;bottom:74px;transform:translateX(-50%);z-index:29;
  width:min(560px,70vw);appearance:none;height:4px;border-radius:2px;
  background:rgba(255,255,255,.14);cursor:pointer;
  opacity:0;pointer-events:none;transition:opacity .3s;
}
body.ready #slider{opacity:.95;pointer-events:auto}
#slider::-webkit-slider-thumb{
  appearance:none;width:15px;height:15px;border-radius:50%;
  background:var(--ink);border:2.5px solid #fff;box-shadow:0 2px 8px rgba(0,0,0,.6);
}
#slider::-moz-range-thumb{width:12px;height:12px;border-radius:50%;background:var(--ink);border:2.5px solid #fff}

/* ---------- Thumbnails ---------- */
#thumbs{
  position:fixed;top:104px;left:14px;bottom:14px;width:190px;z-index:40;
  background:rgba(13,16,21,.97);border:1px solid rgba(255,255,255,.12);border-radius:14px;
  transform:translateX(calc(-100% - 20px));transition:transform .28s cubic-bezier(.4,0,.2,1);
  display:flex;flex-direction:column;overflow:hidden;
  box-shadow:0 18px 50px rgba(0,0,0,.5);
}
#thumbs.open{transform:translateX(0)}
#thumbs header{
  display:flex;align-items:center;justify-content:space-between;
  padding:13px 16px;font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;
  color:rgba(255,255,255,.75);border-bottom:1px solid rgba(255,255,255,.1);flex:none;
}
#thumbs header button{background:none;border:none;color:rgba(255,255,255,.5);cursor:pointer;font-size:18px;line-height:1}
#thumbs header button:hover{color:#fff}
#thumbList{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:14px;scrollbar-width:none;-ms-overflow-style:none}
#thumbList::-webkit-scrollbar{display:none}
.thumb{cursor:pointer;text-align:center}
.thumb .tframe{
  background:#fff;border-radius:3px;overflow:hidden;
  border:2px solid transparent;min-height:80px;
  box-shadow:0 3px 10px rgba(0,0,0,.45);
}
.thumb.current .tframe{border-color:#fff}
.thumb canvas{display:block;width:100%}
.thumb .tnum{font-size:11px;color:rgba(255,255,255,.45);margin-top:6px}

#vtoast{
  position:fixed;top:112px;left:50%;transform:translateX(-50%);z-index:950;
  background:rgba(15,18,24,.96);border:1px solid rgba(255,255,255,.14);border-radius:10px;
  color:#fff;padding:11px 18px;font-size:13px;box-shadow:0 8px 24px rgba(0,0,0,.5);
  opacity:0;pointer-events:none;transition:opacity .25s;max-width:80vw;
}
#vtoast.show{opacity:1}

/* Single-page mode (phones) */
body.single #slotL{border-radius:4px}
body.single #slotL::after{display:none}
body.single #slotR{display:none}

@media (max-width:720px){
  #stageInner{padding:104px 52px 104px}
  .edge.left{left:6px}
  .edge.right{right:6px}
  .edge .chip{width:40px;height:40px}
  #slider{width:56vw}
  #toolbar{gap:2px;padding:7px 8px}
  .tool{width:34px;height:34px}
  #zoomLabel{width:38px;font-size:12px}
  #firstBtn,#lastBtn,#shotBtn,#fsBtn{display:none}
  #toolbar .sep{margin:0 2px}
  #thumbs{width:160px}
}
@media (prefers-reduced-motion:reduce){
  #flipper{transition:none !important}
  .ld-book::before,.ld-book::after{animation:none}
}