/* ============================================================
   ROCK TOUGH Plywood — Premium Flipbook Viewer
   "Plywood that fights back."
   ============================================================ */

/* ---- StPageFlip core (bundled, MIT — Nodlik/StPageFlip) ---- */
.stf__parent{position:relative;display:block;box-sizing:border-box;transform:translateZ(0);-ms-touch-action:pan-y;touch-action:pan-y}
.stf__wrapper{position:relative;width:100%;box-sizing:border-box}
.stf__parent canvas{position:absolute;width:100%;height:100%;left:0;top:0}
.stf__block{position:absolute;width:100%;height:100%;box-sizing:border-box;perspective:2000px}
.stf__item{display:none;position:absolute;transform-style:preserve-3d}
.stf__outerShadow,.stf__innerShadow,.stf__hardShadow,.stf__hardInnerShadow{position:absolute;left:0;top:0}

/* ============================================================ Brand tokens ============================================================ */
:root{
  --pink:#EE1451;
  --pink-bright:#ff2d63;
  --pink-soft:#ff5a83;
  --gold:#F4B321;
  --gold-soft:#ffd166;
  --ink:#0b0b0d;
  --ink-2:#121216;
  --ink-3:#1a1a20;
  --steel:#26262e;
  --line:rgba(255,255,255,.10);
  --line-soft:rgba(255,255,255,.06);
  --text:#f5f5f7;
  --muted:#9b9ba6;
  --muted-2:#6f6f7a;
  --radius:14px;
  --chrome-blur:saturate(140%) blur(16px);
  --ease:cubic-bezier(.22,.61,.36,1);
  --font:"Inter","Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
}

/* ============================================================ Reset / base ============================================================ */
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%;overflow:hidden}
body{
  font-family:var(--font);
  color:var(--text);
  background:
    radial-gradient(125% 100% at 50% -18%, #24242f 0%, #14141a 46%, #09090c 100%),
    #09090c;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  user-select:none;-webkit-user-select:none;-webkit-touch-callout:none;-webkit-tap-highlight-color:transparent;
}
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background:
    radial-gradient(60% 50% at 50% 42%, rgba(238,20,81,.10), transparent 70%),
    radial-gradient(100% 100% at 50% 120%, rgba(0,0,0,.55), transparent 60%),
    repeating-linear-gradient(115deg, rgba(255,255,255,.012) 0 2px, transparent 2px 5px);
  mix-blend-mode:screen;opacity:.9;
}
img{ -webkit-user-drag:none; user-drag:none; pointer-events:none; }
a{ -webkit-user-drag:none; }

/* ============================================================ App shell ============================================================ */
#app{position:fixed;inset:0;z-index:1;display:flex;flex-direction:column;height:100%;width:100%;}

/* ---------------- Header ---------------- */
.app-header{
  flex:0 0 auto;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:12px clamp(14px,3vw,30px);
  background:linear-gradient(180deg, rgba(12,12,15,.86), rgba(12,12,15,.50));
  backdrop-filter:var(--chrome-blur);-webkit-backdrop-filter:var(--chrome-blur);
  border-bottom:1px solid var(--line-soft);position:relative;z-index:30;
}
.app-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,transparent,var(--pink) 18%,var(--gold) 50%,var(--pink) 82%,transparent);opacity:.55;
}
.brand{display:flex;align-items:center;gap:14px;min-width:0}
.brand .logo{ height:42px;width:auto;display:block;-webkit-user-drag:none;filter:drop-shadow(0 2px 6px rgba(0,0,0,.4)); }
.brand .tagline{font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted);border-left:1px solid var(--line);padding-left:14px;white-space:nowrap;}
.brand .tagline b{color:var(--pink-soft);font-weight:600}
.apptitle{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  display:flex;align-items:center;gap:.7em;pointer-events:none;user-select:none;
  font-size:clamp(12px,1.45vw,16px);font-weight:600;letter-spacing:.24em;text-transform:uppercase;white-space:nowrap;
  color:#f1eadc;text-shadow:0 1px 12px rgba(0,0,0,.55);
}
.apptitle span{color:#f4eee2}
.apptitle b{color:var(--gold);font-weight:700;letter-spacing:.20em}
.apptitle .dot{width:5px;height:5px;background:var(--pink);display:inline-block;transform:rotate(45deg);border-radius:1px;box-shadow:0 0 9px rgba(238,20,81,.75)}
.social{display:flex;align-items:center;gap:9px}
.social a{
  width:38px;height:38px;border-radius:11px;display:grid;place-items:center;color:var(--muted);
  background:rgba(255,255,255,.04);border:1px solid var(--line);
  transition:transform .25s var(--ease), color .25s, background .25s, border-color .25s, box-shadow .25s;
}
.social a svg{width:18px;height:18px;display:block}
.social a:hover{color:#fff;transform:translateY(-2px);background:linear-gradient(180deg,var(--pink),#c50f41);border-color:transparent;box-shadow:0 8px 20px rgba(238,20,81,.35);}

/* ---------------- Stage ---------------- */
.stage{position:relative;flex:1 1 auto;min-height:0;display:flex;align-items:center;justify-content:center;padding:clamp(10px,2.4vw,34px);perspective:2200px;perspective-origin:50% 44%;}
.tilt{position:relative;z-index:1;width:100%;height:100%;transform-style:preserve-3d;transition:transform .25s cubic-bezier(.22,.61,.36,1);will-change:transform;}
#flipbook{position:relative;z-index:1;width:100%;height:100%;margin:0 auto;touch-action:pan-y;will-change:transform;}
#flipbook .stf__wrapper{height:100%!important}

/* soft ambient ground pool behind the book for depth */
.stage::after{
  content:"";position:absolute;z-index:0;pointer-events:none;
  left:50%;top:54%;transform:translate(-50%,-50%);
  width:min(86vw,1220px);height:min(70vh,820px);
  background:radial-gradient(closest-side, rgba(0,0,0,.55), rgba(0,0,0,.30) 52%, transparent 78%);
  filter:blur(30px);opacity:.4;
}

/* pages */
.page{width:100%;height:100%;background:#ffffff;}
/* hard pages (cover/back + all pages on mobile) are double-sided: white reverse, never a mirrored image */
.stf__item.--hard .page-content{ -webkit-backface-visibility:hidden!important; backface-visibility:hidden!important; }
.page-content{
  position:relative;width:100%;height:100%;
  background-color:#fbfaf7;background-repeat:no-repeat;background-position:center center;background-size:cover;
  -webkit-backface-visibility:hidden;backface-visibility:hidden;
  box-shadow:0 16px 42px -14px rgba(0,0,0,.55), 0 3px 10px rgba(0,0,0,.30);
}
.stf__item.--soft.--left  .page-content{ box-shadow:0 16px 42px -14px rgba(0,0,0,.55), inset -30px 0 52px -24px rgba(0,0,0,.36); }
.stf__item.--soft.--right .page-content{ box-shadow:0 16px 42px -14px rgba(0,0,0,.55), inset  30px 0 52px -24px rgba(0,0,0,.36); }
.page-back{ display:none !important; }
.page-back.show-back{
  display:block !important;position:absolute;inset:0;
  background-repeat:no-repeat;background-position:center;background-size:cover;background-color:#fff;
  transform:rotateY(180deg);
  -webkit-backface-visibility:hidden;backface-visibility:hidden;
}
.page-content::before{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:2;opacity:var(--wm-opacity,.20);
  background-image:url("../assets/watermark.svg");background-repeat:repeat;background-size:300px auto;mix-blend-mode:normal;
}

/* ---------------- Footer / controls ---------------- */
.app-footer{
  flex:0 0 auto;display:flex;align-items:center;justify-content:center;
  padding:13px clamp(12px,3vw,26px) calc(13px + env(safe-area-inset-bottom,0px));position:relative;z-index:30;
}
.controls{
  display:flex;align-items:center;gap:6px;padding:8px 10px;
  background:linear-gradient(180deg, rgba(22,22,27,.92), rgba(14,14,18,.92));
  backdrop-filter:var(--chrome-blur);-webkit-backdrop-filter:var(--chrome-blur);
  border:1px solid var(--line);border-radius:999px;
  box-shadow:0 12px 40px rgba(0,0,0,.5), inset 0 1px 0 rgba(255,255,255,.05);
}
.ctrl{
  -webkit-appearance:none;appearance:none;cursor:pointer;width:42px;height:42px;border-radius:999px;border:1px solid transparent;
  background:transparent;color:var(--muted);display:grid;place-items:center;
  transition:color .2s, background .2s, transform .15s var(--ease), box-shadow .2s;
}
.ctrl svg{width:20px;height:20px;display:block}
.ctrl:hover{color:#fff;background:rgba(255,255,255,.07)}
.ctrl:active{transform:scale(.92)}
.ctrl.is-active{color:#fff;background:linear-gradient(180deg,var(--pink),#c50f41);box-shadow:0 6px 16px rgba(238,20,81,.4)}
.ctrl:disabled{opacity:.3;cursor:default;pointer-events:none}
.ctrl--accent{color:#fff;background:linear-gradient(180deg,var(--pink),#c50f41);box-shadow:0 6px 16px rgba(238,20,81,.35)}
.ctrl--accent:hover{filter:brightness(1.08);background:linear-gradient(180deg,var(--pink-bright),#d11147)}
.ctrl-sep{width:1px;height:26px;background:var(--line);margin:0 4px}
.pageind{display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:96px;padding:0 12px;gap:6px;user-select:none;}
.pageind .num{font-size:13px;letter-spacing:.06em;color:#e9e9ee;font-variant-numeric:tabular-nums}
.pageind .num b{color:var(--pink-soft);font-weight:700}
.pageind .track{position:relative;width:100%;height:3px;border-radius:3px;background:rgba(255,255,255,.10);overflow:hidden}
.pageind .fill{position:absolute;left:0;top:0;bottom:0;width:0;border-radius:3px;background:linear-gradient(90deg,var(--pink),var(--gold));transition:width .5s var(--ease)}
.ctrl[data-tip]{position:relative}
.ctrl[data-tip]::after{
  content:attr(data-tip);position:absolute;bottom:calc(100% + 10px);left:50%;transform:translateX(-50%) translateY(4px);
  background:#000;color:#fff;font-size:11px;letter-spacing:.03em;padding:5px 9px;border-radius:7px;white-space:nowrap;
  opacity:0;pointer-events:none;transition:opacity .18s, transform .18s;border:1px solid var(--line);
}
.ctrl[data-tip]:hover::after{opacity:1;transform:translateX(-50%) translateY(0)}

/* ============================================================ Loading screen ============================================================ */
#loader{
  position:fixed;inset:0;z-index:200;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:30px;
  background:radial-gradient(70% 60% at 50% 38%, rgba(238,20,81,.16), transparent 68%),radial-gradient(120% 90% at 50% 0%, #1b1b22, var(--ink) 70%);
  transition:opacity .7s var(--ease), visibility .7s;
}
#loader.hidden{opacity:0;visibility:hidden}
.loader-logo{width:min(60vw,360px);height:auto;-webkit-user-drag:none;filter:drop-shadow(0 8px 30px rgba(0,0,0,.5));animation:logoIn 1s var(--ease) both, logoPulse 3.2s ease-in-out 1s infinite;}
@keyframes logoIn{from{opacity:0;transform:translateY(14px) scale(.97)}to{opacity:1;transform:none}}
@keyframes logoPulse{0%,100%{filter:drop-shadow(0 8px 30px rgba(0,0,0,.5))}50%{filter:drop-shadow(0 8px 44px rgba(238,20,81,.45))}}
.loader-bar{position:relative;width:min(70vw,300px);height:4px;border-radius:4px;background:rgba(255,255,255,.10);overflow:hidden}
.loader-bar i{position:absolute;left:0;top:0;bottom:0;width:0%;border-radius:4px;background:linear-gradient(90deg,var(--pink),var(--gold));box-shadow:0 0 14px rgba(238,20,81,.6);transition:width .35s var(--ease)}
.loader-text{font-size:11px;letter-spacing:.34em;text-transform:uppercase;color:var(--muted)}
.loader-text b{color:var(--pink-soft);font-weight:600}

/* ============================================================ Overview ============================================================ */
#overview{
  position:fixed;inset:0;z-index:120;display:flex;flex-direction:column;
  background:rgba(8,8,11,.86);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  opacity:0;visibility:hidden;transition:opacity .35s var(--ease),visibility .35s;
}
#overview.open{opacity:1;visibility:visible}
.ov-head{display:flex;align-items:center;justify-content:space-between;padding:18px clamp(16px,4vw,40px);border-bottom:1px solid var(--line-soft)}
.ov-title{font-size:13px;letter-spacing:.22em;text-transform:uppercase;color:var(--muted)}
.ov-title b{color:#fff;font-weight:600}
.ov-grid{flex:1;overflow-y:auto;display:grid;gap:16px;padding:clamp(16px,3vw,34px);grid-template-columns:repeat(auto-fill,minmax(190px,1fr));align-content:start;}
.ov-thumb{
  position:relative;cursor:pointer;border-radius:9px;overflow:hidden;border:1px solid var(--line);
  background:#15151a center/cover no-repeat;aspect-ratio:1.339/1;
  transition:transform .25s var(--ease),border-color .25s,box-shadow .25s;
}
.ov-thumb:hover{transform:translateY(-4px);border-color:var(--pink);box-shadow:0 14px 30px rgba(0,0,0,.5)}
.ov-thumb.is-current{border-color:var(--gold);box-shadow:0 0 0 2px var(--gold) inset}
.ov-thumb .pn{position:absolute;left:8px;bottom:7px;font-size:11px;letter-spacing:.05em;background:rgba(0,0,0,.6);padding:2px 8px;border-radius:20px;color:#fff}

/* ============================================================ Zoom ============================================================ */
#zoom{
  position:fixed;inset:0;z-index:140;display:none;
  background:rgba(7,7,10,.94);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  cursor:zoom-out;overflow:hidden;touch-action:none;
}
#zoom.open{display:block}
#zoom .zviewport{position:absolute;inset:0;display:flex;align-items:center;justify-content:center}
#zoom .zimg{background-repeat:no-repeat;background-position:center;background-size:contain;transform-origin:center center;transition:transform .12s ease-out;will-change:transform;cursor:grab;}
#zoom .zimg.grabbing{cursor:grabbing;transition:none}
.zoom-tools{position:absolute;left:50%;bottom:24px;transform:translateX(-50%);display:flex;gap:8px;z-index:2}

/* ============================================================ PROTECTED VIEW ============================================================ */
#protect{
  position:fixed;inset:0;z-index:300;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:24px;text-align:center;
  background:rgba(6,6,9,.97);opacity:0;visibility:hidden;transition:opacity .12s linear,visibility .12s;
}
#protect.show{opacity:1;visibility:visible}
#protect .plogo{width:min(56vw,300px);height:auto;-webkit-user-drag:none;opacity:.95}
#protect .ptitle{font-size:clamp(20px,4vw,30px);font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:#fff}
#protect .ptitle span{color:var(--pink-soft)}
#protect .psub{font-size:13px;letter-spacing:.05em;color:var(--muted);max-width:380px;line-height:1.6}
#protect .lock{width:46px;height:46px;color:var(--pink-soft)}
#protect .pclose{margin-top:6px;font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted-2)}
#app.protected .stage{filter:blur(26px) brightness(.4);transition:filter .05s linear}

/* ============================================================ Hint chip ============================================================ */
#hint{
  position:fixed;left:50%;bottom:96px;transform:translateX(-50%);z-index:40;display:flex;align-items:center;gap:9px;
  padding:9px 16px;border-radius:999px;background:rgba(20,20,26,.82);border:1px solid var(--line);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);font-size:12px;letter-spacing:.04em;color:var(--text);
  box-shadow:0 10px 30px rgba(0,0,0,.45);opacity:0;transition:opacity .5s var(--ease);pointer-events:none;
}
#hint.show{opacity:1}
#hint svg{width:16px;height:16px;color:var(--pink-soft)}

/* ============================================================ Responsive ============================================================ */
@media (max-width:820px){
  .brand .tagline{display:none}
  .apptitle{display:none}
  .brand .logo{height:34px}
  .social{gap:6px}
  .social a{width:34px;height:34px;border-radius:9px}
  .social a svg{width:16px;height:16px}
  .controls{gap:2px;padding:6px 7px}
  .ctrl{width:38px;height:38px}
  .ctrl svg{width:18px;height:18px}
  .pageind{min-width:74px;padding:0 6px}
  .stage{padding:10px}
}
@media (max-width:560px){
  .ctrl--hide-sm{display:none}
  .ctrl-sep--hide-sm{display:none}
  .pageind{min-width:64px}
  .app-header{padding:10px 14px}
}
@media (max-width:380px){ .ctrl{width:34px;height:34px} }
.ov-grid::-webkit-scrollbar{width:10px}
.ov-grid::-webkit-scrollbar-thumb{background:rgba(255,255,255,.14);border-radius:10px}
.ov-grid::-webkit-scrollbar-track{background:transparent}
@media (prefers-reduced-motion:reduce){ .loader-logo{animation:logoIn .4s var(--ease) both} }


/* ============================================================
   AWESOME upgrades — studio environment, page-block thickness,
   grounded contact shadow
   ============================================================ */

/* studio floor + top spotlight */
.stage::before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(56% 42% at 50% 24%, rgba(255,255,255,.07), transparent 70%),
    radial-gradient(70% 50% at 50% 30%, rgba(238,20,81,.07), transparent 72%),
    radial-gradient(46% 20% at 50% 84%, rgba(255,255,255,.08), transparent 72%),
    linear-gradient(180deg, transparent 54%, rgba(0,0,0,.5) 100%);
}

/* dynamic contact shadow under the book (placed by JS) */
#bookShadow{
  position:absolute;z-index:0;pointer-events:none;border-radius:50%;
  background:radial-gradient(closest-side, rgba(0,0,0,.62), rgba(0,0,0,.34) 55%, transparent 80%);
  filter:blur(20px);opacity:.85;transition:opacity .35s ease;
}

/* page-block THICKNESS on the outer fore-edges (cream stacked-paper edges) */
.stf__item.--right .page-content{
  box-shadow:
    1px 0 0 rgba(255,255,255,.55), 3px 0 0 #efe9da, 5px 0 0 #e7e0ce, 7px 1px 0 #ddd5c0,
    9px 1px 0 #d2cab3, 11px 2px 0 #c7bea6, 13px 3px 2px rgba(0,0,0,.30),
    0 20px 48px -14px rgba(0,0,0,.62);
}
.stf__item.--left .page-content{
  box-shadow:
    -1px 0 0 rgba(255,255,255,.55), -3px 0 0 #efe9da, -5px 0 0 #e7e0ce, -7px 1px 0 #ddd5c0,
    -9px 1px 0 #d2cab3, -11px 2px 0 #c7bea6, -13px 3px 2px rgba(0,0,0,.30),
    0 20px 48px -14px rgba(0,0,0,.62);
}
/* interior spreads: thickness on the fore-edge + soft gutter at the spine */
.stf__item.--soft.--right .page-content{
  box-shadow:
    1px 0 0 rgba(255,255,255,.55), 3px 0 0 #efe9da, 5px 0 0 #e7e0ce, 7px 1px 0 #ddd5c0,
    9px 1px 0 #d2cab3, 11px 2px 0 #c7bea6, 13px 3px 2px rgba(0,0,0,.30),
    inset 34px 0 62px -26px rgba(0,0,0,.42), 0 20px 48px -14px rgba(0,0,0,.62);
}
.stf__item.--soft.--left .page-content{
  box-shadow:
    -1px 0 0 rgba(255,255,255,.55), -3px 0 0 #efe9da, -5px 0 0 #e7e0ce, -7px 1px 0 #ddd5c0,
    -9px 1px 0 #d2cab3, -11px 2px 0 #c7bea6, -13px 3px 2px rgba(0,0,0,.30),
    inset -34px 0 62px -26px rgba(0,0,0,.42), 0 20px 48px -14px rgba(0,0,0,.62);
}

/* subtle cinematic entrance for the whole stage */
@keyframes stageIn{from{opacity:0;transform:scale(.975)}to{opacity:1;transform:none}}
.stage{animation:stageIn 1s cubic-bezier(.22,.61,.36,1) both;}


/* glossy floor reflection of the book (rebuilt on each settle) */
#reflection{display:none!important;}
.rp{position:absolute;overflow:hidden;opacity:.5;filter:blur(.4px);
  -webkit-mask-image:linear-gradient(to bottom, rgba(0,0,0,.55), rgba(0,0,0,0) 94%);
          mask-image:linear-gradient(to bottom, rgba(0,0,0,.55), rgba(0,0,0,0) 94%);}
.rp .rpimg{position:absolute;left:0;top:0;width:100%;background-repeat:no-repeat;background-position:center;background-size:cover;transform:scaleY(-1);}
#bookShadow{display:none;}

/* ambient light motes */
#motes{position:absolute;inset:0;z-index:0;pointer-events:none;}

/* ============================================================
   Custom double-sided-leaf flip engine
   ============================================================ */
.fb-wrap{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;}
.fb-book{position:relative;transform-style:preserve-3d;}
.fb-leaf{position:absolute;top:0;transform-origin:left center;transform-style:preserve-3d;will-change:transform;}
.fb-face{
  position:absolute;inset:0;background-repeat:no-repeat;background-position:center;background-size:cover;background-color:#fbfaf7;
  -webkit-backface-visibility:hidden;backface-visibility:hidden;overflow:hidden;
  box-shadow:0 18px 48px -14px rgba(0,0,0,.62), 0 4px 12px rgba(0,0,0,.34);
}
.fb-face.fb-back{transform:rotateY(180deg);}
.fb-face.fb-white{background-color:#f6f3ec;background-image:none!important;}
.fb-face::after{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:3;
  background-image:url("../assets/watermark.svg");background-repeat:repeat;background-size:300px auto;
  opacity:var(--wm-opacity,.2);
}
.fb-face.fb-white::after{opacity:0;}
.fb-glare{position:absolute;inset:0;pointer-events:none;z-index:2;opacity:0;
  background:linear-gradient(105deg, rgba(255,255,255,0) 32%, rgba(255,255,255,.20) 50%, rgba(255,255,255,0) 68%);}
.fb-leaf.flipping .fb-glare,.pp-flip.flipping .fb-glare{animation:fbGlare 950ms ease both;}
@keyframes fbGlare{0%{opacity:0}45%{opacity:.85}60%{opacity:.85}100%{opacity:0}}
/* spine gutter on spreads */
.fb-gutter{position:absolute;top:0;pointer-events:none;z-index:60;opacity:0;transition:opacity .45s ease;
  background:linear-gradient(90deg, rgba(0,0,0,0) 0%, rgba(0,0,0,.30) 47%, rgba(0,0,0,.34) 50%, rgba(0,0,0,.30) 53%, rgba(0,0,0,0) 100%);}
/* portrait single-page */
.pp-page{position:absolute;background-repeat:no-repeat;background-position:center;background-size:cover;background-color:#fbfaf7;overflow:hidden;
  box-shadow:0 18px 48px -14px rgba(0,0,0,.62), 0 4px 12px rgba(0,0,0,.34);}
.pp-page::after{content:"";position:absolute;inset:0;pointer-events:none;background-image:url("../assets/watermark.svg");background-repeat:repeat;background-size:300px auto;opacity:var(--wm-opacity,.2);}
.pp-flip{position:absolute;transform-origin:left center;transform-style:preserve-3d;will-change:transform;}

/* invisible blank partner pages (let cover/back float centered) */
.page-blank, .page-blank .page-content{ background:transparent!important; box-shadow:none!important; }
.page-blank .page-content::before{ display:none!important; }

/* watermark removed from the brochure pages (clean premium look) */
.page-content::before{ display:none !important; }