:root{
  --bg-1:#13213d;
  --bg-2:#0b1426;
  --ink:#e9edf5;
  --ink-soft:#aab3c4;
  --accent:#e8752c;
  --bar:rgba(12,20,38,.86);
  --bar-line:rgba(255,255,255,.1);
  --btn-hover:rgba(255,255,255,.1);
  --ui:-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;
  --safe-b:env(safe-area-inset-bottom,0px);
}
*{box-sizing:border-box}

/* The page itself never scrolls. On iPhone Safari a scrollable page
   makes the address bar slide in and out, which resizes the viewport
   and makes the book jump around — locking the body prevents that. */
html,body{height:100%;margin:0;overflow:hidden;overscroll-behavior:none}
body{
  position:fixed;inset:0;
  display:flex;flex-direction:column;
  background:radial-gradient(120% 90% at 50% 0%, var(--bg-1) 0%, var(--bg-2) 70%);
  color:var(--ink);font-family:var(--ui);
  -webkit-tap-highlight-color:transparent;
  -webkit-text-size-adjust:100%;
}

/* ---------- top bar ---------- */
.fb-top{
  flex:0 0 auto;display:flex;align-items:center;justify-content:center;
  padding:max(12px, env(safe-area-inset-top,0px)) 20px 4px;min-height:48px;
}
.fb-title{
  margin:0;font-size:15px;font-weight:600;letter-spacing:.01em;color:var(--ink);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%;
}

/* ---------- stage + book ---------- */
.fb-stage{
  position:relative;flex:1 1 auto;min-height:0;
  display:flex;align-items:center;justify-content:center;
  overflow:hidden;touch-action:none;user-select:none;-webkit-user-select:none;
}
.fb-zoom{transform-origin:50% 50%;will-change:transform;transition:transform .25s ease}
.fb-zoom.no-anim{transition:none}
.fb-bookwrap{position:relative;visibility:hidden}
.fb-bookwrap.is-ready{visibility:visible}
.fb-book{filter:drop-shadow(0 18px 30px rgba(0,0,0,.45))}

.fb-page{background:#fff;overflow:hidden}
/* HTML pages (catalog): laid out at a fixed design size, then scaled to the page */
.fb-page .fb-html{
  position:absolute;left:0;top:0;width:var(--html-w,460px);height:var(--html-h,650px);
  transform:scale(var(--page-scale,1));transform-origin:0 0;
}
.fb-page--pdf.is-failed::after{
  content:"This page could not be displayed";position:absolute;inset:0;display:grid;place-items:center;
  font:13px var(--ui);color:#8b93a5;background:#fff;
}
.fb-page img{
  display:block;width:100%;height:100%;object-fit:contain;
  -webkit-user-drag:none;pointer-events:none;
}
.fb-page .fb-page-spin{
  position:absolute;inset:0;display:grid;place-items:center;
  background:#fff;transition:opacity .2s ease;
}
.fb-page .fb-page-spin::after{
  content:"";width:26px;height:26px;border-radius:50%;
  border:3px solid #e3e7ef;border-top-color:var(--accent);
  animation:fb-spin .8s linear infinite;
}
.fb-page.is-loaded .fb-page-spin{opacity:0;pointer-events:none}
@keyframes fb-spin{to{transform:rotate(360deg)}}

/* large previous/next arrows beside the book (hidden on phones) */
.fb-side{
  position:absolute;top:50%;z-index:5;transform:translateY(-50%);
  width:48px;height:48px;border-radius:50%;border:0;cursor:pointer;
  display:grid;place-items:center;color:#fff;
  background:rgba(255,255,255,.08);transition:background .15s ease,opacity .15s ease;
}
.fb-side:hover{background:rgba(255,255,255,.18)}
.fb-side:disabled{opacity:0;pointer-events:none}
.fb-side-prev{left:16px}
.fb-side-next{right:16px}
.fb-side svg{width:26px;height:26px}

/* pan/pinch layer, only present while zoomed in */
.fb-pan{position:absolute;inset:0;z-index:6;cursor:grab;touch-action:none}
.fb-pan.is-dragging{cursor:grabbing}

/* ---------- loader ---------- */
.fb-loader{
  position:absolute;inset:0;z-index:8;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:14px;transition:opacity .3s ease;
}
.fb-loader.is-hidden{opacity:0;pointer-events:none}
.fb-loader-ring svg{width:56px;height:56px;transform:rotate(-90deg)}
.fb-loader-ring circle{fill:none;stroke-width:3.5}
.fb-loader-ring circle:first-child{stroke:rgba(255,255,255,.12)}
.fb-loader-ring circle:last-child{
  stroke:var(--accent);stroke-linecap:round;
  stroke-dasharray:119.4;stroke-dashoffset:119.4;transition:stroke-dashoffset .2s ease;
}
.fb-loader-text{font-size:13px;color:var(--ink-soft);text-align:center;max-width:280px;line-height:1.5}
.fb-loader.is-error .fb-loader-ring{display:none}
.fb-loader.is-error .fb-loader-text{color:#f3b3a3;font-size:14px}
.fb-loader-text a{color:#ffb488}

/* ---------- toolbar ---------- */
.fb-toolbar{
  flex:0 0 auto;align-self:center;z-index:10;
  display:flex;align-items:center;gap:2px;
  margin:6px 12px calc(12px + var(--safe-b));padding:6px 8px;
  background:var(--bar);border:1px solid var(--bar-line);border-radius:14px;
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  box-shadow:0 10px 30px -12px rgba(0,0,0,.6);
  max-width:calc(100vw - 24px);
}
.fb-icon-btn{
  width:40px;height:40px;flex:0 0 auto;border:0;border-radius:9px;
  display:inline-grid;place-items:center;cursor:pointer;
  background:transparent;color:var(--ink);text-decoration:none;
  transition:background .15s ease,color .15s ease,opacity .15s ease;
}
.fb-icon-btn:hover{background:var(--btn-hover)}
.fb-icon-btn.is-active{color:var(--accent);background:rgba(232,117,44,.14)}
.fb-icon-btn:disabled{opacity:.3;cursor:default;background:transparent}
.fb-icon-btn svg,.fb-side svg{fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.fb-icon-btn svg{width:20px;height:20px}
.fb-icon-btn:focus-visible,.fb-side:focus-visible,.fb-counter input:focus-visible,.fb-thumb:focus-visible{
  outline:2px solid var(--accent);outline-offset:2px;
}
.fb-sep{width:1px;height:22px;background:var(--bar-line);margin:0 6px}

.fb-counter{display:flex;align-items:center;gap:4px;margin:0 4px;font-size:13px;color:var(--ink-soft);font-variant-numeric:tabular-nums}
.fb-counter input{
  width:58px;height:30px;border-radius:7px;border:1px solid var(--bar-line);
  background:rgba(255,255,255,.06);color:var(--ink);text-align:center;
  font:inherit;font-size:13px;font-weight:600;
}
.fb-counter-total{white-space:nowrap}

/* ---------- thumbnails ---------- */
.fb-thumbs{
  position:absolute;left:0;right:0;bottom:calc(70px + var(--safe-b));z-index:9;
  margin:0 auto;width:min(960px, calc(100vw - 24px));
  background:var(--bar);border:1px solid var(--bar-line);border-radius:14px;
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  box-shadow:0 18px 40px -16px rgba(0,0,0,.7);
  animation:fb-rise .2s ease;
}
.fb-thumbs[hidden]{display:none}
@keyframes fb-rise{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.fb-thumbs-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:6px 6px 0 16px;font-size:12px;font-weight:600;color:var(--ink-soft);
}
.fb-thumbs-strip{
  display:flex;gap:12px;overflow-x:auto;padding:10px 16px 14px;
  scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch;touch-action:pan-x;
}
.fb-thumb{
  flex:0 0 auto;width:84px;border:0;padding:0;background:none;cursor:pointer;
  color:var(--ink-soft);font:inherit;font-size:11px;scroll-snap-align:start;text-align:center;
}
.fb-thumb-img{
  display:block;position:relative;overflow:hidden;width:84px;border-radius:3px;background:#fff center/contain no-repeat;
  box-shadow:0 0 0 1px rgba(255,255,255,.12);margin-bottom:5px;
  transition:box-shadow .15s ease,transform .15s ease;
}
.fb-thumb-img .fb-thumb-html{position:absolute;left:0;top:0;transform-origin:0 0;pointer-events:none}
.fb-thumb:hover .fb-thumb-img{transform:translateY(-2px)}
.fb-thumb.is-current{color:var(--accent);font-weight:600}
.fb-thumb.is-current .fb-thumb-img{box-shadow:0 0 0 2px var(--accent)}

/* ---------- toast ---------- */
.fb-toast{
  position:fixed;left:50%;bottom:calc(84px + var(--safe-b));z-index:20;
  transform:translate(-50%,8px);opacity:0;pointer-events:none;
  background:#fff;color:#1c2b45;font-size:13px;font-weight:600;
  padding:9px 14px;border-radius:9px;box-shadow:0 10px 30px -10px rgba(0,0,0,.5);
  transition:opacity .2s ease,transform .2s ease;
}
.fb-toast.is-shown{opacity:1;transform:translate(-50%,0)}

.fb-noscript{position:fixed;inset:auto 0 40% 0;text-align:center;color:var(--ink-soft)}
.fb-noscript a{color:#ffb488}

/* ---------- phones ---------- */
@media (max-width: 640px), (pointer: coarse) and (max-height: 500px){
  .fb-desktop{display:none}
  .fb-side{display:none}
  .fb-sep{margin:0 3px}
  .fb-icon-btn{width:38px;height:38px}
  .fb-top{min-height:40px;padding-bottom:0}
  .fb-title{font-size:14px}
}
/* phone held sideways: every pixel of height counts, so drop the title bar */
@media (max-height: 500px){
  .fb-top{display:none}
  .fb-stage{padding-top:env(safe-area-inset-top,0px)}
  .fb-toolbar{margin-top:4px;margin-bottom:calc(6px + var(--safe-b));padding:3px 6px}
  .fb-thumbs{bottom:calc(56px + var(--safe-b))}
}
@media (prefers-reduced-motion: reduce){
  .fb-zoom,.fb-thumbs,.fb-toast{transition:none;animation:none}
}

/* StPageFlip injects its own base styles, but its wrapper rule has a typo
   (".sft__wrapper") — restate it so the book's inner layers position correctly. */
.stf__wrapper{position:relative;width:100%;box-sizing:border-box}

/* catalog: small link to the admin panel in the top-right corner */
.fb-top{position:relative}
.fb-admin-link{
  position:absolute;right:20px;top:50%;transform:translateY(-35%);
  color:#ffb488;text-decoration:none;font-size:12.5px;font-weight:600;
}
.fb-admin-link:hover{text-decoration:underline}
@media (max-width: 640px){ .fb-admin-link{display:none} }

/* ---------- phone page-turner (book-mobile.js) ---------- */
.mf-book{position:relative}
.mf-store{display:none}
.mf-camera{
  position:absolute;left:0;top:0;width:calc(var(--mf-w) * 2);height:var(--mf-h);
  transform-style:preserve-3d;perspective:calc(var(--mf-w) * 5);will-change:transform;
}
.mf-slot{position:absolute;top:0;width:var(--mf-w);height:var(--mf-h);overflow:hidden;background:#fff}
.mf-slot.is-empty{background:transparent}
.mf-slot-l{left:0}
.mf-slot-r{left:var(--mf-w)}
.mf-slot > .fb-page,.mf-slice > .fb-page{position:absolute;inset:0;width:100%;height:100%}
/* soft gutter shading either side of the spine, like a bound book */
.mf-slot-l:not(.is-empty)::after,.mf-slot-r:not(.is-empty)::after{content:"";position:absolute;top:0;bottom:0;width:9%;pointer-events:none;z-index:2}
.mf-slot-l::after{right:0;background:linear-gradient(to left,rgba(0,0,0,.16),rgba(0,0,0,0))}
.mf-slot-r::after{left:0;background:linear-gradient(to right,rgba(0,0,0,.16),rgba(0,0,0,0))}
.mf-spine{display:none}
/* shadows thrown by the turning page onto the pages underneath */
.mf-underlay{position:absolute;top:0;width:var(--mf-w);height:var(--mf-h);pointer-events:none;opacity:0;z-index:3}
.mf-underlay-l{left:0;background:linear-gradient(to left,rgba(0,0,0,.45),rgba(0,0,0,.08) 70%,rgba(0,0,0,0))}
.mf-underlay-r{left:var(--mf-w);background:linear-gradient(to right,rgba(0,0,0,.45),rgba(0,0,0,.08) 70%,rgba(0,0,0,0))}
/* the turning page: hinged strips */
.mf-leaf{position:absolute;top:0;left:var(--mf-w);z-index:5;transform-style:preserve-3d;pointer-events:none}
.mf-strip{position:absolute;top:0;height:100%;transform-origin:0 50%;transform-style:preserve-3d}
.mf-face{position:absolute;inset:0;overflow:hidden;background:#fff;-webkit-backface-visibility:hidden;backface-visibility:hidden}
.mf-back{transform:rotateY(180deg)}
.mf-slice{position:absolute;top:0}
.mf-shade{position:absolute;inset:0;background:#000;opacity:0;pointer-events:none}
/* page-edge arrows on phones (like the andwis viewer) */
body.fb-mf .fb-side{
  display:grid;width:34px;height:34px;z-index:7;
  background:rgba(11,20,38,.38);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);
}
body.fb-mf .fb-side svg{width:18px;height:18px}
body.fb-mf .fb-side-prev{left:8px}
body.fb-mf .fb-side-next{right:8px}
/* sound on/off button */
.fb-icon-btn.is-muted{color:var(--ink-soft)}
/* phones: fit the toolbar on one row (full screen isn't available on iPhone anyway) */
@media (max-width: 440px){
  body.fb-mf #btnFull{display:none}
  .fb-toolbar{padding:5px 6px;gap:0}
  .fb-icon-btn{width:36px;height:38px}
  .fb-counter input{width:50px}
  .fb-sep{margin:0 2px}
}