/* ═══════════════════════════════════════════════════════════
   Переплёт — читальня
   ═══════════════════════════════════════════════════════════ */

:root{
  --bg:#0d0c0b;
  --ink:#efe9df;
  --ink-2:#a49b8e;
  --ink-3:#6d665d;
  --line:rgba(239,233,223,.10);
  --line-2:rgba(239,233,223,.18);
  --accent:#c8a35c;
  --paper:#fbf8f2;
  --ff:"Inter","SF Pro Text",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --fd:"Playfair Display",Georgia,"Iowan Old Style","Times New Roman",serif;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--ff);
  color:var(--ink);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow:hidden;
}
img{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
::selection{background:var(--accent);color:#171310}

.backdrop{
  position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(1100px 620px at 18% -8%, rgba(200,163,92,.16), transparent 62%),
    radial-gradient(900px 620px at 92% 8%, rgba(120,140,190,.10), transparent 60%),
    radial-gradient(1200px 800px at 50% 120%, rgba(224,54,74,.08), transparent 65%),
    linear-gradient(180deg,#100e0d 0%, #0b0a09 55%, #0d0b0a 100%);
}
.backdrop::after{
  content:"";position:absolute;inset:0;opacity:.05;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

.view{position:relative;z-index:1}
[hidden]{display:none !important}

/* ═══════════ БИБЛИОТЕКА ═══════════ */
.view--library{
  height:100%;overflow-y:auto;overflow-x:hidden;
  padding:clamp(38px,6vh,84px) clamp(20px,5vw,72px) 56px;
  display:flex;flex-direction:column;gap:clamp(30px,5vh,54px);
}
.lib__head{max-width:640px}
.lib__brand{
  display:inline-flex;align-items:center;gap:10px;
  font-size:12px;letter-spacing:.24em;text-transform:uppercase;
  color:var(--ink-2);margin-bottom:22px;
}
.lib__mark{
  width:20px;height:20px;border-radius:5px;flex:none;position:relative;
  background:linear-gradient(140deg,var(--accent),#8a6c33);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.22);
}
.lib__mark::after{
  content:"";position:absolute;left:50%;top:4px;bottom:4px;width:1px;background:rgba(0,0,0,.45);
}
.lib__title{
  font-family:var(--fd);font-weight:400;
  font-size:clamp(46px,7.4vw,92px);line-height:.95;margin:0 0 18px;letter-spacing:-.02em;
}
.lib__title::after{
  content:"";display:block;width:64px;height:2px;margin-top:22px;
  background:linear-gradient(90deg,var(--accent),transparent);
}
.lib__sub{margin:0;max-width:46ch;color:var(--ink-2);font-size:15.5px;line-height:1.65}

.shelf{
  display:grid;gap:clamp(20px,2.4vw,32px);
  grid-template-columns:repeat(auto-fill,minmax(340px,1fr));
}

.card{
  --accent:#c8a35c;
  position:relative;display:flex;gap:22px;
  padding:22px;border-radius:16px;
  background:linear-gradient(150deg,rgba(255,255,255,.055),rgba(255,255,255,.018));
  border:1px solid var(--line);
  backdrop-filter:blur(8px);
  cursor:pointer;outline:none;
  transition:transform .4s cubic-bezier(.2,.8,.2,1), border-color .3s, box-shadow .4s, background .3s;
  animation:rise .6s cubic-bezier(.2,.8,.2,1) backwards;
  animation-delay:calc(var(--i,0) * 90ms);
}
@keyframes rise{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
.card:hover,.card:focus-visible{
  transform:translateY(-4px);
  border-color:color-mix(in srgb, var(--accent) 45%, transparent);
  box-shadow:0 26px 50px -26px rgba(0,0,0,.9);
  background:linear-gradient(150deg,rgba(255,255,255,.075),rgba(255,255,255,.025));
}

.card__cover{
  position:relative;flex:none;width:134px;align-self:flex-start;
  border-radius:3px 6px 6px 3px;overflow:hidden;
  box-shadow:0 16px 30px -14px rgba(0,0,0,.9), 0 0 0 1px rgba(0,0,0,.5);
  transition:transform .45s cubic-bezier(.2,.8,.2,1);
  transform-origin:left center;
}
.card:hover .card__cover{transform:perspective(900px) rotateY(-9deg) scale(1.02)}
.card__cover img{width:100%;height:auto}
.card__spine{
  position:absolute;left:0;top:0;bottom:0;width:9px;
  background:linear-gradient(90deg,rgba(0,0,0,.55),rgba(0,0,0,.05) 60%,rgba(255,255,255,.12));
}
.card__gloss{
  position:absolute;inset:0;pointer-events:none;opacity:.5;transition:opacity .4s;
  background:linear-gradient(105deg,rgba(255,255,255,.22) 0%,transparent 34%);
}
.card:hover .card__gloss{opacity:.85}

.card__body{display:flex;flex-direction:column;min-width:0;flex:1}
.card__tag{
  align-self:flex-start;font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--accent);border:1px solid color-mix(in srgb,var(--accent) 38%,transparent);
  padding:3px 9px;border-radius:100px;margin-bottom:12px;
}
.card__title{
  font-family:var(--fd);font-weight:400;font-size:23px;line-height:1.18;
  margin:0 0 4px;letter-spacing:-.01em;
}
.card__author{margin:0 0 12px;font-size:12.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3)}
.card__blurb{margin:0 0 auto;font-size:13.5px;line-height:1.6;color:var(--ink-2)}
.card__foot{
  display:flex;justify-content:space-between;gap:12px;align-items:baseline;
  margin-top:18px;padding-top:12px;border-top:1px solid var(--line);
  font-size:11px;color:var(--ink-3);
}
.card__imprint{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.card__pages{flex:none;font-variant-numeric:tabular-nums}
.card__cta{
  display:inline-flex;align-items:center;gap:8px;margin-top:14px;
  font-size:12.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink);
  opacity:.55;transition:opacity .3s,gap .3s,color .3s;
}
.card:hover .card__cta{opacity:1;gap:13px;color:var(--accent)}
.card__cta-arrow{width:20px;height:1px;background:currentColor;position:relative}
.card__cta-arrow::after{
  content:"";position:absolute;right:0;top:-3px;width:7px;height:7px;
  border-top:1px solid currentColor;border-right:1px solid currentColor;transform:rotate(45deg);
}

.lib__foot{margin-top:auto;padding-top:26px;font-size:11.5px;color:var(--ink-3);border-top:1px solid var(--line)}

/* ═══════════ ЧИТАЛКА ═══════════ */
.view--reader{height:100%;display:grid;grid-template-rows:auto minmax(0,1fr) auto}

.rbar{
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px;
  padding:14px clamp(14px,2.4vw,26px);
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,rgba(0,0,0,.35),transparent);
}
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:8px 14px;border-radius:9px;font-size:13px;
  border:1px solid var(--line);color:var(--ink-2);
  transition:color .25s,border-color .25s,background .25s;
}
.btn:hover{color:var(--ink);border-color:var(--line-2);background:rgba(255,255,255,.05)}
.btn--back{justify-self:start}
.btn__arrow{width:14px;height:1px;background:currentColor;position:relative}
.btn__arrow::after{
  content:"";position:absolute;left:0;top:-3px;width:7px;height:7px;
  border-bottom:1px solid currentColor;border-left:1px solid currentColor;transform:rotate(45deg);
}

.rbar__meta{display:flex;align-items:center;gap:11px;min-width:0}
.rbar__title{font-family:var(--fd);font-size:16px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rbar__dot{width:3px;height:3px;border-radius:50%;background:var(--accent);flex:none}
.rbar__author{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);white-space:nowrap}

.rbar__tools{justify-self:end;display:flex;align-items:center;gap:10px}
.seg{display:flex;border:1px solid var(--line);border-radius:9px;overflow:hidden}
.seg button{padding:7px 13px;font-size:12px;color:var(--ink-3);transition:color .22s,background .22s}
.seg button+button{border-left:1px solid var(--line)}
.seg button:hover{color:var(--ink)}
.seg button.is-on{color:#171310;background:var(--accent)}
.iconbtn{
  width:34px;height:34px;display:grid;place-items:center;
  border:1px solid var(--line);border-radius:9px;color:var(--ink-2);
  transition:color .25s,border-color .25s,background .25s;
}
.iconbtn:hover{color:var(--ink);border-color:var(--line-2);background:rgba(255,255,255,.05)}
.iconbtn svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round}

/* ── сцена ── */
.stage{
  position:relative;display:grid;place-items:center;
  min-height:0;padding:clamp(12px,2.2vh,26px);
  overscroll-behavior:contain;
}
.nav{
  position:absolute;top:0;bottom:0;width:clamp(48px,8vw,110px);z-index:4;
  opacity:0;transition:opacity .3s;
}
.nav--prev{left:0}
.nav--next{right:0}
.stage:hover .nav{opacity:1}
.nav::before{
  content:"";position:absolute;top:50%;left:50%;width:11px;height:11px;
  border-top:1.5px solid var(--ink-2);border-right:1.5px solid var(--ink-2);
  transition:border-color .25s,transform .25s;
}
.nav--next::before{transform:translate(-50%,-50%) rotate(45deg)}
.nav--prev::before{transform:translate(-50%,-50%) rotate(-135deg)}
.nav:hover::before{border-color:var(--accent)}
.nav--next:hover::before{transform:translate(-40%,-50%) rotate(45deg)}
.nav--prev:hover::before{transform:translate(-60%,-50%) rotate(-135deg)}

/* ── книга ── */
.book{
  position:relative;
  perspective:2600px;perspective-origin:50% 42%;
  filter:drop-shadow(0 34px 44px rgba(0,0,0,.62));
  transition:width .35s cubic-bezier(.2,.8,.2,1), height .35s cubic-bezier(.2,.8,.2,1),
             transform .45s cubic-bezier(.2,.8,.2,1);
}
/* обложка и последняя непарная страница стоят по центру сцены */
.book.is-cover{transform:translateX(-25%)}
.book.is-tail{transform:translateX(25%)}
.book.is-single{transform:none}
.book::before{
  content:"";position:absolute;left:2%;right:2%;bottom:-26px;height:36px;pointer-events:none;
  background:radial-gradient(50% 50% at 50% 50%, rgba(0,0,0,.6), transparent 72%);
  filter:blur(6px);
}
.book__slot{
  position:absolute;top:0;height:100%;width:var(--pw,50%);
  background:var(--paper);overflow:hidden;
}
.book__slot--l{left:0;border-radius:3px 0 0 3px;box-shadow:inset -14px 0 26px -18px rgba(0,0,0,.75)}
.book__slot--r{right:0;border-radius:0 3px 3px 0;box-shadow:inset 14px 0 26px -18px rgba(0,0,0,.75)}
.book.is-single .book__slot--l{display:none}
.book.is-single .book__slot--r{width:100%;border-radius:3px}
.book.is-cover .book__slot--l,
.book.is-tail  .book__slot--r{background:transparent;box-shadow:none}

.pg{width:100%;height:100%;object-fit:contain;background:var(--paper);user-select:none;-webkit-user-drag:none}
.pg.is-empty{opacity:0}

.book__gutter{
  position:absolute;top:0;bottom:0;left:50%;width:44px;transform:translateX(-50%);
  z-index:3;pointer-events:none;opacity:.85;transition:opacity .3s;
  background:linear-gradient(90deg,
    rgba(0,0,0,0) 0%, rgba(0,0,0,.16) 34%, rgba(0,0,0,.34) 48%,
    rgba(255,255,255,.10) 50%,
    rgba(0,0,0,.34) 52%, rgba(0,0,0,.16) 66%, rgba(0,0,0,0) 100%);
}
.book.is-single .book__gutter,
.book.is-cover .book__gutter,
.book.is-tail .book__gutter{opacity:0}

/* ── переворачиваемый лист ── */
.leaf{
  position:absolute;top:0;left:50%;width:var(--pw,50%);height:100%;
  transform-origin:left center;transform-style:preserve-3d;
  z-index:5;visibility:hidden;will-change:transform;
}
.book.is-single .leaf{left:0;width:100%}
.book.is-turning .leaf{visibility:visible}
.leaf__face{
  position:absolute;inset:0;overflow:hidden;
  backface-visibility:hidden;-webkit-backface-visibility:hidden;
  background:var(--paper);box-shadow:0 0 26px rgba(0,0,0,.4);
}
.leaf__face--front{border-radius:0 3px 3px 0}
.leaf__face--back{transform:rotateY(180deg);border-radius:3px 0 0 3px}
.leaf.is-blank-back .leaf__face--back .pg{opacity:0}
.leaf__shade{
  position:absolute;inset:0;pointer-events:none;opacity:0;
  background:linear-gradient(90deg, rgba(0,0,0,.55) 0%, rgba(0,0,0,.16) 26%, rgba(255,255,255,.10) 92%);
}
.leaf__shade--back{
  background:linear-gradient(270deg, rgba(0,0,0,.55) 0%, rgba(0,0,0,.16) 26%, rgba(255,255,255,.08) 92%);
}

.book__cast{
  position:absolute;top:0;bottom:0;left:50%;width:52%;
  transform-origin:left center;z-index:4;pointer-events:none;opacity:0;
  background:linear-gradient(90deg, rgba(0,0,0,.55), rgba(0,0,0,.12) 55%, transparent);
}
.book.is-single .book__cast{width:100%}

/* подсказка про колесо */
.wheelhint{
  position:absolute;left:50%;bottom:14px;transform:translate(-50%,10px);
  opacity:0;pointer-events:none;transition:opacity .5s,transform .5s;z-index:6;
}
.wheelhint.is-on{opacity:1;transform:translate(-50%,0)}
.wheelhint span{
  position:relative;display:inline-flex;align-items:center;gap:10px;
  padding:8px 16px 8px 12px;border-radius:100px;
  background:rgba(16,14,13,.82);border:1px solid var(--line-2);
  backdrop-filter:blur(8px);
  font-size:12px;letter-spacing:.06em;color:var(--ink-2);
}
.wheelhint span::before{
  content:"";width:13px;height:20px;border-radius:7px;border:1.5px solid currentColor;flex:none;
}
.wheelhint span::after{
  content:"";position:absolute;left:19px;top:15px;width:1.5px;height:5px;border-radius:2px;
  background:currentColor;animation:scrollwheel 1.5s infinite;
}
@keyframes scrollwheel{0%{transform:translateY(0);opacity:1}70%{transform:translateY(5px);opacity:0}100%{opacity:0}}

/* ── низ ── */
.rfoot{
  display:grid;grid-template-columns:1fr auto;align-items:center;
  gap:8px 20px;padding:12px clamp(14px,2.4vw,26px) 16px;
  border-top:1px solid var(--line);
  background:linear-gradient(0deg,rgba(0,0,0,.35),transparent);
}
.scrub{grid-column:1 / -1;position:relative;height:18px;cursor:pointer;touch-action:none;outline:none}
.scrub__track{position:absolute;top:8px;left:0;right:0;height:2px;background:var(--line-2);border-radius:2px;overflow:hidden}
.scrub__fill{height:100%;width:0;background:linear-gradient(90deg,color-mix(in srgb,var(--accent) 55%,transparent),var(--accent));transition:width .25s}
.scrub__knob{
  position:absolute;top:3px;left:0;width:12px;height:12px;border-radius:50%;
  background:var(--accent);transform:translateX(-50%);pointer-events:none;
  box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 18%,transparent);
  transition:left .25s,transform .2s;
}
.scrub:hover .scrub__knob,.scrub:focus-visible .scrub__knob{transform:translateX(-50%) scale(1.22)}
.rfoot__no{font-size:13px;font-variant-numeric:tabular-nums;color:var(--ink)}
.rfoot__no i{font-style:normal;color:var(--ink-3);font-size:11.5px}
.rfoot__hint{justify-self:end;font-size:11px;letter-spacing:.06em;color:var(--ink-3)}

/* ═══════════ адаптив ═══════════ */
@media (max-width:900px){
  .rbar{grid-template-columns:auto 1fr;gap:10px}
  .rbar__meta{justify-self:start}
  .rbar__tools{grid-column:1 / -1;justify-self:stretch;justify-content:space-between}
  .rfoot{grid-template-columns:1fr}
  .rfoot__hint{display:none}
  .rfoot__no{justify-self:center}
}
@media (max-width:640px){
  .card{flex-direction:column;gap:16px}
  .card__cover{width:112px}
  .nav{opacity:1;width:44px}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
}