/* =============================================================
   AL-ETEMAD · CATALOG FLIPBOOK
   A premium, lightweight single-page flip experience built from
   the real printed catalog (88 pages). GPU-accelerated 3D turns,
   lazy-loaded pages, swipe + keyboard + zoom.
   ============================================================= */

/* ---------- Launch banner (sits in the catalog section) ---------- */
.cat-book-cta{
  position:relative; display:grid; grid-template-columns:auto 1fr auto; align-items:center; gap:clamp(16px,3vw,34px);
  margin:0 0 38px; padding:clamp(20px,3vw,30px) clamp(22px,3.4vw,38px);
  border:1px solid var(--line); border-radius:22px; overflow:hidden;
  background:
    radial-gradient(120% 160% at 100% 0%, rgba(189,138,36,.16), transparent 55%),
    linear-gradient(180deg, var(--black-2), var(--black));
  transition:border-color .4s var(--ease), transform .4s var(--ease), box-shadow .4s var(--ease);
}
.cat-book-cta:hover{ border-color:rgba(189,138,36,.55); transform:translateY(-3px); box-shadow:0 26px 60px rgba(46,26,20,.14); }
.cat-book-cta__visual{
  width:clamp(78px,9vw,120px); aspect-ratio:1.4097/1; border-radius:8px; position:relative; flex:none;
  background:#0c0c0e center/cover no-repeat; box-shadow:0 14px 36px rgba(0,0,0,.6);
  outline:1px solid rgba(255,255,255,.08); transform:rotate(-3deg);
  transition:transform .5s var(--ease);
}
.cat-book-cta:hover .cat-book-cta__visual{ transform:rotate(0deg) scale(1.04); }
.cat-book-cta__visual::after{ content:""; position:absolute; inset:0; border-radius:8px;
  background:linear-gradient(115deg, rgba(255,255,255,.25) 0%, transparent 22%); }
.cat-book-cta__body{ min-width:0; }
.cat-book-cta__kick{ font-size:12px; font-weight:700; letter-spacing:.16em; text-transform:uppercase; color:var(--gold); }
.cat-book-cta__title{ font-family:var(--serif); font-size:clamp(22px,3vw,32px); font-weight:600; line-height:1.15; margin:6px 0 4px; }
.cat-book-cta__sub{ color:var(--grey); font-size:14px; max-width:52ch; }
.cat-book-cta__btn{ flex:none; }
@media (max-width:680px){
  .cat-book-cta{ grid-template-columns:auto 1fr; }
  .cat-book-cta__btn{ grid-column:1/-1; justify-self:stretch; }
}

/* ---------- Overlay shell ---------- */
.fb{ position:fixed; inset:0; z-index:6000; display:flex; flex-direction:column;
  opacity:0; visibility:hidden; transition:opacity .45s var(--ease), visibility .45s;
  --fb-fg:#f6f3ee; color:var(--fb-fg);
  -webkit-user-select:none; user-select:none; touch-action:none; }
.fb.is-open{ opacity:1; visibility:visible; }
.fb__backdrop{ position:absolute; inset:0;
  background:radial-gradient(130% 120% at 50% -10%, #1a1a1f 0%, #0b0b0d 55%, #060607 100%); }
.fb__backdrop::after{ content:""; position:absolute; inset:0; opacity:.5;
  background:radial-gradient(60% 50% at 50% 50%, transparent 40%, rgba(0,0,0,.6)); }

/* ---------- Top bar ---------- */
.fb__top{ position:relative; z-index:4; display:flex; align-items:center; gap:14px;
  padding:clamp(12px,2vw,20px) clamp(14px,3vw,32px); }
.fb__brand{ display:flex; align-items:center; gap:11px; min-width:0; }
.fb__brand .brandmark{ width:30px; flex:none; }
.fb__titles{ min-width:0; line-height:1.2; }
.fb__titles b{ font-family:var(--serif); font-size:18px; font-weight:600; display:block; }
.fb__titles span{ font-size:11px; letter-spacing:.12em; text-transform:uppercase; color:var(--grey); }
.fb__spacer{ flex:1; }
.fb__tool{ width:42px; height:42px; border-radius:50%; display:grid; place-items:center; flex:none;
  background:rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.1);
  transition:background .3s, border-color .3s, transform .3s, color .3s; }
.fb__tool:hover{ background:rgba(189,138,36,.16); border-color:rgba(189,138,36,.5); color:var(--gold-soft); }
.fb__tool svg{ width:19px; height:19px; fill:none; stroke:currentColor; stroke-width:1.9; stroke-linecap:round; stroke-linejoin:round; }
.fb__tool.is-off{ opacity:.42; }
.fb__tool[hidden]{ display:none; }

/* ---------- Stage + book ---------- */
.fb__stage{ position:relative; z-index:3; flex:1; min-height:0; display:grid; place-items:center;
  padding:6px clamp(8px,5vw,80px); perspective:2100px; perspective-origin:50% 46%; }
.fb-book{ position:relative; transform-style:preserve-3d; will-change:transform;
  box-shadow:0 40px 90px rgba(0,0,0,.6); border-radius:3px; }
.fb-book::after{ /* spine/ground shadow */
  content:""; position:absolute; left:6%; right:6%; bottom:-26px; height:40px; z-index:-1;
  background:radial-gradient(60% 100% at 50% 0%, rgba(0,0,0,.55), transparent 70%); filter:blur(6px); }

/* a page face (static current + flipping leaf share this) */
.fb-face{ position:absolute; inset:0; overflow:hidden; background:#fff center/cover no-repeat;
  border-radius:3px; backface-visibility:hidden; -webkit-backface-visibility:hidden; }
.fb-face img{ width:100%; height:100%; object-fit:contain; object-position:center; display:block;
  pointer-events:none; -webkit-user-drag:none; }

.fb-page{ z-index:1; box-shadow:inset 0 0 0 1px rgba(0,0,0,.04); }
/* current page sits flat; supports pan/zoom */
.fb-page .fb-face__media{ position:absolute; inset:0; transform-origin:0 0; transition:transform .28s var(--ease); will-change:transform; }
.fb.is-zoomed .fb-page .fb-face__media{ transition:none; cursor:grab; }
.fb.is-panning .fb-page .fb-face__media{ cursor:grabbing; }

/* the rotating leaf */
.fb-leaf{ z-index:3; will-change:transform;
  box-shadow:0 18px 40px rgba(0,0,0,.34); }
.fb-leaf--origin-left{ transform-origin:left center; }
.fb-leaf--origin-right{ transform-origin:right center; }

/* cylindrical shading — the page darkens toward the fold (spine) as it bends,
   the way light falls off a curved sheet of paper */
.fb-leaf__shade{ position:absolute; inset:0; z-index:2; pointer-events:none; opacity:0;
  background:linear-gradient(90deg,
    rgba(0,0,0,.46) 0%, rgba(0,0,0,.20) 18%, rgba(0,0,0,0) 42%,
    rgba(255,255,255,.04) 70%, rgba(255,255,255,.10) 100%); }
.fb-leaf--origin-right .fb-leaf__shade{ transform:scaleX(-1); }

/* travelling specular highlight — a soft band of light sliding across the curve */
.fb-leaf__gloss{ position:absolute; inset:0; z-index:3; pointer-events:none; opacity:0;
  background:linear-gradient(100deg,
    transparent 38%, rgba(255,255,255,.5) 50%, transparent 62%);
  mix-blend-mode:screen; }
.fb-leaf--origin-right .fb-leaf__gloss{ transform:scaleX(-1); }

/* contact shadow the lifting page casts on the sheet beneath it */
.fb-page__cast{ position:absolute; inset:0; z-index:2; pointer-events:none; opacity:0;
  border-radius:3px;
  background:linear-gradient(90deg,
    rgba(0,0,0,.5) 0%, rgba(0,0,0,.28) 22%, rgba(0,0,0,.08) 46%, transparent 66%); }
.fb-page__cast.fb-leaf--origin-right{ transform:scaleX(-1); }

/* page-edge highlight to read as paper */
.fb-face::before{ content:""; position:absolute; inset:0; z-index:1; pointer-events:none; border-radius:3px;
  box-shadow:inset 0 0 0 1px rgba(0,0,0,.06); }

/* loading shimmer behind a page until its image decodes */
.fb-face.is-loading{ background:#101013; }
.fb-face.is-loading::after{ content:""; position:absolute; inset:0; z-index:0;
  background:linear-gradient(100deg, transparent 20%, rgba(255,255,255,.05) 50%, transparent 80%);
  background-size:200% 100%; animation:fbShimmer 1.1s linear infinite; }
@keyframes fbShimmer{ from{ background-position:200% 0; } to{ background-position:-200% 0; } }

/* ---------- Side nav arrows ---------- */
.fb__arrow{ position:absolute; top:50%; transform:translateY(-50%); z-index:5;
  width:clamp(46px,5vw,62px); height:clamp(46px,5vw,62px); border-radius:50%;
  display:grid; place-items:center; background:rgba(18,18,21,.5); border:1px solid rgba(255,255,255,.12);
  backdrop-filter:blur(6px); transition:background .3s, border-color .3s, transform .3s, opacity .3s; }
.fb__arrow:hover{ background:rgba(189,138,36,.9); color:var(--black); border-color:transparent; }
.fb__arrow svg{ width:24px; height:24px; fill:none; stroke:currentColor; stroke-width:2.2; stroke-linecap:round; stroke-linejoin:round; }
.fb__arrow--prev{ inset-inline-start:clamp(8px,2.4vw,28px); }
.fb__arrow--next{ inset-inline-end:clamp(8px,2.4vw,28px); }
.fb__arrow.is-disabled{ opacity:0; pointer-events:none; }

/* ---------- Bottom bar (scrubber + counter) ---------- */
.fb__bottom{ position:relative; z-index:4; display:flex; align-items:center; gap:clamp(12px,2.4vw,24px);
  padding:clamp(10px,1.6vw,16px) clamp(16px,5vw,60px) clamp(16px,2.4vw,26px); }
.fb__counter{ font-size:13px; letter-spacing:.06em; color:var(--grey); white-space:nowrap; flex:none;
  font-variant-numeric:tabular-nums; }
.fb__counter b{ color:var(--fb-fg); font-weight:700; }
.fb__scrub{ position:relative; flex:1; height:34px; display:flex; align-items:center; cursor:pointer; touch-action:none; }
.fb__scrub-track{ position:relative; width:100%; height:4px; border-radius:4px; background:rgba(255,255,255,.12); overflow:hidden; }
.fb__scrub-fill{ position:absolute; inset-block:0; inset-inline-start:0; width:0; border-radius:4px;
  background:linear-gradient(90deg, var(--gold-deep), var(--gold-soft)); }
html[dir="rtl"] .fb__scrub-fill{ background:linear-gradient(270deg, var(--gold-deep), var(--gold-soft)); }
.fb__scrub-knob{ position:absolute; top:50%; width:16px; height:16px; border-radius:50%; background:var(--gold-soft);
  transform:translate(-50%,-50%); box-shadow:0 2px 10px rgba(0,0,0,.5); transition:transform .15s; }
html[dir="rtl"] .fb__scrub-knob{ transform:translate(50%,-50%); }
.fb__scrub:hover .fb__scrub-knob{ transform:translate(-50%,-50%) scale(1.18); }
html[dir="rtl"] .fb__scrub:hover .fb__scrub-knob{ transform:translate(50%,-50%) scale(1.18); }

/* a small floating page bubble shown while scrubbing */
.fb__scrub-bubble{ position:absolute; bottom:30px; transform:translateX(-50%); padding:5px 11px; border-radius:30px;
  background:var(--ivory); color:var(--black); font-size:12px; font-weight:700; white-space:nowrap;
  opacity:0; transition:opacity .2s; pointer-events:none; box-shadow:0 8px 24px rgba(0,0,0,.4); }
.fb__scrub.is-scrubbing .fb__scrub-bubble{ opacity:1; }

/* hint chip on first open */
.fb__hint{ position:absolute; left:50%; bottom:88px; transform:translateX(-50%); z-index:6;
  display:flex; align-items:center; gap:9px; padding:9px 16px; border-radius:40px;
  background:rgba(18,18,21,.82); border:1px solid rgba(255,255,255,.12); backdrop-filter:blur(8px);
  font-size:13px; color:var(--fb-fg); opacity:0; pointer-events:none; transition:opacity .5s; }
.fb__hint.is-show{ opacity:1; }
.fb__hint svg{ width:18px; height:18px; fill:none; stroke:var(--gold-soft); stroke-width:1.8; stroke-linecap:round; stroke-linejoin:round; }

/* ---------- Open / close transition on the book ---------- */
.fb__stage{ transition:transform .5s var(--ease-out), opacity .5s; }
.fb:not(.is-open) .fb__stage{ transform:scale(.92) translateY(18px); opacity:0; }

@media (max-width:680px){
  .fb__titles span{ display:none; }
  .fb__bottom{ gap:12px; }
  .fb__hint{ bottom:78px; font-size:12px; }
}
@media (prefers-reduced-motion:reduce){
  .fb-leaf{ transition:none !important; }
  .fb__stage{ transition:none !important; }
}