/* ═══════════════════════════════════════════════
   BAR SNOW — book.css  (CAST BOOK)
   dual-page 3D flip book + single-page mobile mode
   ═══════════════════════════════════════════════ */

.bookstage{
  position:relative;overflow:hidden;
  padding:clamp(90px,10vw,150px) 0 clamp(100px,11vw,170px);
}
.bookstage__head{position:relative;z-index:2}

.book-wrap{
  position:relative;z-index:2;
  display:flex;flex-direction:column;align-items:center;
  margin-top:clamp(10px,2vw,30px);
}

/* warm light pool on the bright counter */
.book-wrap::before{
  content:"";position:absolute;left:50%;top:52%;
  width:min(1100px,96vw);height:min(560px,58vw);
  transform:translate(-50%,-42%);
  background:radial-gradient(50% 42% at 50% 52%,rgba(255,236,196,.55),rgba(255,220,160,.2) 55%,transparent 75%);
  pointer-events:none;
}

.book{cursor:grab}
.book.is-grabbing{cursor:grabbing}
.book{
  --bw:clamp(560px,72vw,880px);
  --bh:calc(var(--bw) * .68);
  --pw:calc(var(--bw) / 2);
  position:relative;
  width:var(--bw);height:var(--bh);
  transform-style:preserve-3d;
  perspective:2400px;
  outline:none;
  touch-action:pan-y;
}
.book.is-single{
  --bw:min(86vw,400px);
  --bh:calc(var(--bw) * 1.36);
  --pw:var(--bw);
}

/* table shadow under the book */
.book__shadow{
  position:absolute;left:4%;right:4%;bottom:-7%;height:16%;
  background:radial-gradient(50% 50% at 50% 50%,rgba(8,3,1,.55),transparent 70%);
  filter:blur(6px);
  transform:none;
}

/* boards (hard covers) behind the leaves */
.book__board{
  position:absolute;top:-1.2%;height:102.4%;width:calc(var(--pw) * 1.03);
  background:
    linear-gradient(120deg,rgba(255,255,255,.05),transparent 40%),
    #2A130D;
  border-radius:4px 10px 10px 4px;
  box-shadow:inset 0 0 0 1px rgba(0,0,0,.5),0 10px 30px rgba(5,2,1,.6);
}
.book__board::before{
  content:"";position:absolute;inset:0;border-radius:inherit;
  background-image:var(--tex-wood);background-size:300px 300px;
  opacity:.4;mix-blend-mode:overlay;
}
.book__board--right{right:calc(-1 * var(--pw) * .015)}
.book__board--left{left:calc(-1 * var(--pw) * .015);border-radius:10px 4px 4px 10px;display:none}
.book.is-open .book__board--left{display:block}
.book.is-single .book__board--left{display:none!important}
.book__board--right{left:50%}
.book.is-single .book__board--right{left:0;width:calc(var(--pw) * 1.045)}

/* page-edge stack (thickness illusion) */
.book__edges{
  position:absolute;top:.6%;height:98.8%;width:10px;pointer-events:none;
  background:repeating-linear-gradient(90deg,#E7DCC2 0 1.6px,#C9BC9C 1.6px 2.6px);
  opacity:.9;
}
.book__edges--right{left:calc(50% + var(--pw) - 10px);border-radius:0 3px 3px 0}
.book__edges--left{left:calc(50% - var(--pw));border-radius:3px 0 0 3px}
.book.is-single .book__edges--right{left:calc(var(--pw) - 10px)}
.book.is-single .book__edges--left{display:none}

/* ── leaf ──────────────────────────────────────── */
.leaf{
  position:absolute;top:0;left:50%;
  width:var(--pw);height:100%;
  transform-style:preserve-3d;
  transform-origin:left center;
  will-change:transform;
}
.book.is-single .leaf{left:0}
.leaf__face{
  position:absolute;inset:0;
  -webkit-backface-visibility:hidden;backface-visibility:hidden;
  overflow:hidden;
  background:linear-gradient(180deg,#F7F1E1,#EFE7D2);
  border-radius:0 8px 8px 0;
  box-shadow:inset 0 0 0 1px rgba(122,110,92,.18);
}
.leaf__face::before{ /* paper grain + warm wash */
  content:"";position:absolute;inset:0;
  background:
    linear-gradient(180deg,rgba(255,238,192,.42),rgba(238,206,148,.22) 45%,rgba(214,168,104,.26)),
    var(--tex-paper);
  background-size:auto,240px 240px;opacity:.62;
  pointer-events:none;
}
.leaf__face--back{
  transform:rotateY(180deg);
  border-radius:8px 0 0 8px;
}
/* spine-side shading */
.leaf__face--front::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(90deg,rgba(92,61,36,.22),rgba(92,61,36,.05) 9%,transparent 16%);
}
.leaf__face--back::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(-90deg,rgba(92,61,36,.22),rgba(92,61,36,.05) 9%,transparent 16%);
}
/* dynamic flip shade (JS-driven opacity) */
.leaf__shade{
  position:absolute;inset:0;z-index:9;opacity:0;pointer-events:none;
}
.leaf__face--front .leaf__shade{background:linear-gradient(90deg,rgba(20,10,4,.5),rgba(20,10,4,.06) 60%,transparent)}
.leaf__face--back .leaf__shade{background:linear-gradient(-90deg,rgba(20,10,4,.5),rgba(20,10,4,.06) 60%,transparent)}

/* ── cover faces ───────────────────────────────── */
.leaf__face--cover{
  background:
    radial-gradient(120% 90% at 30% 12%,rgba(255,214,150,.1),transparent 50%),
    linear-gradient(150deg,#4A1F14,#31120B 58%,#240C07);
  border-radius:4px 10px 10px 4px;
  box-shadow:inset 0 0 0 1px rgba(0,0,0,.55),inset 0 1px 0 rgba(255,214,150,.12);
}
.leaf__face--cover::before{
  background-image:var(--tex-wood);background-size:300px 300px;opacity:.5;mix-blend-mode:overlay;
}
.cover-art{
  position:absolute;inset:7%;border:1px solid rgba(232,185,106,.55);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;
  color:var(--amber-soft);text-align:center;
}
.cover-art::before{content:"";position:absolute;inset:6px;border:1px solid rgba(232,185,106,.3)}
.cover-art__rabbit{width:74px;height:52px;fill:currentColor;filter:drop-shadow(0 0 12px rgba(240,164,56,.4))}
.cover-art__title{
  font-family:var(--font-en);font-weight:700;font-size:clamp(24px,3vw,34px);
  letter-spacing:.28em;text-indent:.28em;
  background:linear-gradient(180deg,#F5D9A0,#C89044);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.cover-art__sub{font-family:var(--font-en);font-size:11px;letter-spacing:.5em;text-indent:.5em;opacity:.85}
.cover-art__year{font-family:var(--font-en);font-size:10px;letter-spacing:.3em;opacity:.6}
.cover-art__hint{
  position:absolute;bottom:8%;left:0;right:0;
  font-family:var(--font-ui);font-size:11px;letter-spacing:.2em;color:rgba(232,185,106,.75);
}

/* ── page content ──────────────────────────────── */
.pg{
  position:absolute;inset:0;z-index:1;
  display:flex;flex-direction:column;
  padding:7.5% 8% 6.5%;
}
.pg__head{
  display:flex;align-items:center;justify-content:space-between;
  font-family:var(--font-en);font-size:11px;letter-spacing:.26em;color:var(--ink-mute);
  text-transform:uppercase;
}
.pg__head b{color:var(--verm);font-weight:700;font-size:13px}
.pg__figure{
  position:relative;flex:1;min-height:0;margin:5% 0 4%;
  display:flex;align-items:flex-end;justify-content:center;
}
.pg__figure img{
  max-width:92%;max-height:100%;width:auto;height:auto;object-fit:contain;
  filter:drop-shadow(0 10px 16px rgba(40,24,10,.3));
}
.pg__figure--photo img{ /* non-cutout (Snowman) */
  max-height:100%;border:8px solid #FBF7EC;border-bottom-width:30px;
  box-shadow:0 4px 10px rgba(40,24,10,.25),0 14px 30px rgba(40,24,10,.2);
  transform:rotate(-1.6deg);
  filter:none;
}
.pg__figure-shadow{
  position:absolute;bottom:-2%;left:50%;width:64%;height:7%;
  transform:translateX(-50%);
  background:radial-gradient(50% 50% at 50% 50%,rgba(40,24,10,.3),transparent 72%);
  filter:blur(3px);
}
.pg__name{
  text-align:center;
}
.pg__name-jp{
  font-family:var(--font-jp);font-weight:800;
  font-size:clamp(19px,2.3vw,26px);letter-spacing:.14em;color:var(--ink);
  line-height:1.4;
}
.pg__name-en{
  margin-top:3px;
  font-family:var(--font-en);font-weight:600;font-size:clamp(10px,1vw,12px);
  letter-spacing:.34em;color:var(--ink-mute);text-transform:uppercase;
}
.pg__role{
  display:inline-block;margin-top:8px;padding:3px 12px;
  border:1.6px solid var(--verm);border-radius:3px;
  font-family:var(--font-jp);font-weight:800;font-size:12px;letter-spacing:.3em;text-indent:.3em;
  color:var(--verm);transform:rotate(-2deg);
}
.pg__foot{
  display:flex;align-items:center;gap:10px;margin-top:4%;
  font-family:var(--font-en);font-size:10px;letter-spacing:.22em;color:var(--ink-mute);
}
.pg__foot::before,.pg__foot::after{content:"";flex:1;height:1px;background:var(--paper-line)}
/* intro / closing pages */
.pg--plain{justify-content:center;align-items:center;text-align:center;gap:18px}
.pg--plain .pg__logo{width:64%;opacity:.95}
.pg--plain h3{
  font-family:var(--font-jp);font-weight:800;font-size:clamp(17px,1.9vw,22px);
  letter-spacing:.2em;color:var(--ink);
}
.pg--plain p{font-size:13px;line-height:2.2;color:var(--ink-soft);letter-spacing:.06em}
.pg--plain .stamp-ring{width:92px;height:92px;transform:rotate(-10deg)}
.pg__cta{
  display:inline-block;margin-top:6px;padding:12px 26px;border-radius:999px;
  background:var(--ink);color:var(--paper);
  font-family:var(--font-ui);font-weight:700;font-size:13px;letter-spacing:.1em;
  transition:transform .3s var(--ease-soft),background-color .3s;
}
.pg__cta:hover{transform:translateY(-2px);background:var(--verm)}

/* flip drop-shadow cast on the page beneath */
.book__flipshadow{
  position:absolute;top:0;left:50%;width:var(--pw);height:100%;
  pointer-events:none;opacity:0;z-index:1;
  background:linear-gradient(90deg,rgba(15,8,3,.42),transparent 70%);
  transform-origin:left center;
}
.book.is-single .book__flipshadow{left:0}

/* ── book UI ───────────────────────────────────── */
.book__ui{
  position:relative;z-index:3;
  display:flex;align-items:center;gap:22px;
  margin-top:clamp(40px,4.6vw,56px);
}
.book__arrow{
  width:52px;height:52px;border-radius:50%;
  border:1.5px solid rgba(43,33,24,.5);
  background:rgba(250,245,232,.6);
  display:flex;align-items:center;justify-content:center;
  transition:background-color .3s,border-color .3s,transform .3s var(--ease-soft),opacity .3s;
}
.book__arrow svg{width:20px;height:20px;fill:var(--ink)}
.book__arrow:hover{background:#F6F1E4;border-color:var(--verm);transform:translateY(-2px)}
.book__arrow[disabled]{opacity:.28;pointer-events:none}
.book__pagenum{
  min-width:120px;text-align:center;
  font-family:var(--font-wood);font-size:12px;letter-spacing:.26em;color:var(--ink-soft);
}
.book__hint{
  margin-top:16px;
  font-family:var(--font-ui);font-size:11.5px;letter-spacing:.16em;color:var(--ink-mute);
}
.book__hint-sp{display:none}
@media(max-width:760px){
  .book__hint-pc{display:none}
  .book__hint-sp{display:inline}
  .book-wrap{margin-top:6px}
}

@media(prefers-reduced-motion:reduce){
  .bookstage .book-wrap{display:none}
  .bookstage .rm-cast-grid{display:grid}
}
/* reduced-motion fallback grid (hidden otherwise) */
.rm-cast-grid{
  display:none;position:relative;z-index:2;
  grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:20px;
  max-width:1160px;margin:30px auto 0;padding:0 clamp(20px,4vw,44px);
}
.rm-cast-grid figure{
  background:#F7F1E1;padding:10px 10px 14px;border-radius:4px;text-align:center;
}
.rm-cast-grid img{width:100%;height:190px;object-fit:contain}
.rm-cast-grid figcaption{
  margin-top:8px;font-family:var(--font-jp);font-weight:600;font-size:13px;
  letter-spacing:.1em;color:var(--ink);
}