/* ICSTM catalogue — visual language taken from the printed brochure:
   navy #002144, azure #089ACB, white paper, letterspaced caps. */

:root{
  --ink:#002144;
  --ink-deep:#001426;
  --ink-lift:#0A2F55;
  --azure:#089ACB;
  --azure-soft:#4FBEE6;
  --mist:#8AA6C2;
  --paper:#ffffff;
  --rail:60px;
  --caps:'Arial Narrow','Helvetica Neue',system-ui,-apple-system,'Segoe UI',sans-serif;
  --body:system-ui,-apple-system,'Segoe UI',Roboto,Arial,sans-serif;
}

*{box-sizing:border-box}

html,body{height:100%}

body{
  margin:0;
  background:var(--ink-deep);
  color:var(--paper);
  font-family:var(--body);
  overflow:hidden;
  display:grid;
  grid-template-rows:var(--rail) 1fr var(--rail);
  /* faint vignette so the white pages read as lit objects on a dark stage */
  background-image:radial-gradient(120% 90% at 50% 42%, #0A3159 0%, #001426 70%);
}

.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- rails ---------- */

.rail{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding:0 20px;
  background:rgba(0,20,38,.72);
  border-bottom:1px solid rgba(138,166,194,.16);
  backdrop-filter:blur(8px);
  position:relative;
  z-index:20;
}
.rail--bottom{
  border-bottom:0;
  border-top:1px solid rgba(138,166,194,.16);
  gap:24px;
}

.mark{display:flex;align-items:center;gap:12px;min-width:0}
.mark__name{
  font-family:var(--caps);
  font-weight:700;
  font-size:26px;
  letter-spacing:.16em;
  line-height:1;
  padding-right:2px;
}
.mark__rule{width:1px;height:26px;background:rgba(138,166,194,.35)}
.mark__sub{
  font-size:10px;
  line-height:1.35;
  letter-spacing:.09em;
  text-transform:uppercase;
  color:var(--mist);
}

.rail__actions{display:flex;align-items:center;gap:8px;flex:none}

.btn{
  display:inline-flex;
  align-items:center;
  gap:7px;
  height:34px;
  padding:0 13px;
  border:1px solid rgba(138,166,194,.3);
  border-radius:2px;
  background:transparent;
  color:var(--paper);
  font-family:var(--body);
  font-size:11px;
  font-weight:600;
  letter-spacing:.11em;
  text-transform:uppercase;
  text-decoration:none;
  cursor:pointer;
  transition:border-color .18s, background .18s, color .18s;
}
.btn:hover{border-color:var(--azure);color:var(--azure-soft)}
.btn svg{width:13px;height:13px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;flex:none}
#btn-contents svg{fill:currentColor;stroke:none}
.btn--ghost{border-color:transparent}
.btn[aria-expanded="true"]{border-color:var(--azure);color:var(--azure-soft)}

:focus-visible{outline:2px solid var(--azure-soft);outline-offset:2px}

/* ---------- stage ---------- */

.stage{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:22px 74px;
  min-height:0;
}

.book-frame{
  width:100%;
  height:100%;
  display:flex;
  align-items:center;
  justify-content:center;
}

/* stretch mode reads the size of this element, so it needs a real height */
.book{width:100%;height:100%}
.stf__wrapper{height:100%}

/* the pages themselves */
.page{
  background:var(--paper);
  overflow:hidden;
}
.page img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
  /* the scanned page carries its own margins; nothing to add here */
}
.page--empty{background:#e9eef4}

/* base styles required by StPageFlip (MIT, bundled in lib/) */
.stf__parent{position:relative;display:block;box-sizing:border-box;transform:translateZ(0);touch-action:pan-y;margin:0 auto}
.sft__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}
.stf__item{box-shadow:0 10px 34px rgba(0,0,0,.42)}

.turn{
  position:absolute;
  top:50%;
  transform:translateY(-50%);
  width:46px;
  height:76px;
  border:0;
  border-radius:2px;
  background:rgba(10,47,85,.55);
  color:var(--paper);
  cursor:pointer;
  display:grid;
  place-items:center;
  transition:background .18s,color .18s,opacity .18s;
  z-index:10;
}
.turn:hover{background:var(--azure);color:#001426}
.turn[disabled]{opacity:.2;cursor:default;background:rgba(10,47,85,.35)}
.turn svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.turn--prev{left:14px}
.turn--next{right:14px}

.hint{
  position:absolute;
  left:50%;
  bottom:6px;
  transform:translateX(-50%);
  margin:0;
  font-size:10px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--mist);
  opacity:.75;
  transition:opacity .6s;
  pointer-events:none;
}
.hint.is-gone{opacity:0}

/* ---------- the spine: position + preview ---------- */

.spine{
  position:relative;
  flex:1;
  height:100%;
  display:flex;
  align-items:center;
  cursor:pointer;
  min-width:0;
  touch-action:none;
}
.spine__track{
  position:relative;
  width:100%;
  height:3px;
  background:rgba(138,166,194,.22);
}
.spine__fill{
  position:absolute;
  inset:0 auto 0 0;
  width:0;
  background:var(--azure);
  transition:width .25s ease;
}
.spine__fill::after{
  content:"";
  position:absolute;
  right:-4px;
  top:50%;
  width:9px;
  height:9px;
  margin-top:-4.5px;
  background:var(--azure-soft);
  border-radius:50%;
}
.spine__ticks{
  position:absolute;
  inset:0;
  pointer-events:none;
}
.spine__ticks i{
  position:absolute;
  top:50%;
  width:1px;
  height:11px;
  margin-top:-5.5px;
  background:rgba(138,166,194,.4);
}

.spine__peek{
  position:absolute;
  bottom:calc(100% + 12px);
  transform:translateX(-50%);
  opacity:0;
  visibility:hidden;
  transition:opacity .14s;
  pointer-events:none;
  text-align:center;
}
.spine.is-peeking .spine__peek{opacity:1;visibility:visible}
.spine__peek img{
  display:block;
  width:104px;
  height:auto;
  background:var(--paper);
  box-shadow:0 10px 26px rgba(0,0,0,.55);
  border:1px solid rgba(255,255,255,.14);
}
.spine__peek span{
  display:block;
  margin-top:6px;
  font-size:10px;
  letter-spacing:.14em;
  color:var(--mist);
}

.counter{display:flex;align-items:center;gap:6px;flex:none;font-size:13px;color:var(--mist)}
.counter input{
  width:46px;
  height:30px;
  text-align:center;
  border:1px solid rgba(138,166,194,.3);
  border-radius:2px;
  background:transparent;
  color:var(--paper);
  font-family:var(--body);
  font-size:13px;
  font-variant-numeric:tabular-nums;
}
.counter input:focus{border-color:var(--azure)}
.counter__total{font-variant-numeric:tabular-nums}

/* ---------- all pages overlay ---------- */

.contents{
  position:fixed;
  inset:0;
  z-index:40;
  background:rgba(0,20,38,.97);
  display:flex;
  flex-direction:column;
}
.contents[hidden]{display:none}
.contents__head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:var(--rail);
  padding:0 20px;
  border-bottom:1px solid rgba(138,166,194,.16);
  flex:none;
}
.contents__head h2{
  margin:0;
  font-family:var(--caps);
  font-size:15px;
  font-weight:700;
  letter-spacing:.2em;
  text-transform:uppercase;
}
.contents__grid{
  flex:1;
  overflow-y:auto;
  padding:22px;
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(120px,1fr));
  gap:18px 16px;
  align-content:start;
}
.thumb{
  border:0;
  padding:0;
  background:none;
  cursor:pointer;
  text-align:center;
  color:var(--mist);
  font-size:11px;
  letter-spacing:.1em;
}
.thumb img{
  display:block;
  width:100%;
  height:auto;
  background:var(--paper);
  border:1px solid rgba(138,166,194,.2);
  transition:border-color .16s, transform .16s;
}
.thumb:hover img{border-color:var(--azure);transform:translateY(-2px)}
.thumb span{display:block;margin-top:7px}
.thumb.is-current img{border-color:var(--azure-soft);box-shadow:0 0 0 2px var(--azure)}

.noscript{padding:40px;text-align:center;color:var(--mist)}
.noscript a{color:var(--azure-soft)}

/* ---------- narrow screens ---------- */

@media (max-width:820px){
  :root{--rail:52px}
  .mark__sub{display:none}
  .btn{font-size:0;gap:0;padding:0 11px}
  .btn svg{width:15px;height:15px}
  #full-label{display:none}
  .stage{padding:12px 8px}
  .turn{width:34px;height:60px;background:rgba(10,47,85,.4)}
  .turn--prev{left:2px}
  .turn--next{right:2px}
  .hint{display:none}
  .contents__grid{grid-template-columns:repeat(auto-fill,minmax(92px,1fr));gap:14px 10px;padding:14px}
}

@media (prefers-reduced-motion:reduce){
  *{transition-duration:.01ms !important;animation-duration:.01ms !important}
}