/* Blätter-Ansicht */
.viewer {
  --bar-h: 64px; --foot-h: 56px;
  position: fixed; inset: 0; z-index: 100;
  display: grid; grid-template-rows: var(--bar-h) 1fr var(--foot-h);
  color: #fff; font-family: var(--font, system-ui, sans-serif);
  background:
    radial-gradient(ellipse 60% 55% at 50% 46%, rgba(255,255,255,.09), rgba(255,255,255,0) 70%),
    linear-gradient(180deg, #353b3f 0%, #272b2e 100%);
  opacity: 0; transition: opacity .35s ease;
  outline: none;
}
.viewer.is-open { opacity: 1; }
.viewer.is-closing { opacity: 0; transition-duration: .3s; }
.viewer.is-closing .viewer__bookwrap { transform: scale(.94) !important; opacity: 0; transition: transform .35s ease, opacity .3s ease; }

.viewer__bar {
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 16px;
  padding: 0 14px 0 22px; padding-top: env(safe-area-inset-top);
}
.viewer__title { min-width: 0; display: flex; flex-direction: column; line-height: 1.25; }
.viewer__brand { font-size: 13px; color: rgba(255,255,255,.6); }
.viewer__name { font-size: 17px; font-weight: 600; letter-spacing: -0.01em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.viewer__count { margin: 0; font-size: 14px; color: rgba(255,255,255,.75); font-variant-numeric: tabular-nums; white-space: nowrap; }
.viewer__actions { justify-self: end; display: flex; gap: 2px; }
.vbtn {
  width: 44px; height: 44px; display: grid; place-items: center; flex: none;
  border: 0; border-radius: 12px; background: transparent; color: rgba(255,255,255,.82); cursor: pointer;
  transition: background-color .2s, color .2s;
}
.vbtn:hover { background: rgba(255,255,255,.1); color: #fff; }
.vbtn[aria-pressed="true"] { background: rgba(228,237,100,.18); color: #e4ed64; }
.vbtn:disabled { opacity: .35; cursor: default; background: transparent; }
.vbtn--close { margin-left: 6px; background: rgba(255,255,255,.08); }
.vbtn:focus-visible, .viewer__nav:focus-visible, .vthumb:focus-visible { outline: 3px solid #e4ed64; outline-offset: 2px; }

.viewer__stage { position: relative; min-height: 0; display: grid; place-items: center; overflow: hidden; }
.viewer__progress { position: absolute; left: 0; right: 0; top: 0; height: 2px; overflow: hidden; }
.viewer__progress span { display: block; height: 100%; background: #e4ed64; transform-origin: 0 50%; transform: scaleX(0); transition: transform .3s ease, opacity .6s ease .4s; }
.viewer.is-loaded .viewer__progress span { transform: scaleX(1); opacity: 0; }

.viewer__bookwrap {
  position: absolute; left: 50%; top: 50%; translate: -50% -50%; opacity: 0;
  transition: transform .75s cubic-bezier(.3,.7,.2,1), opacity .25s ease;
  filter: drop-shadow(0 40px 46px rgba(0,0,0,.42)) drop-shadow(0 4px 8px rgba(0,0,0,.22));
}
.viewer__bookwrap.is-visible { opacity: 1; }
.viewer__book { position: relative; }
.viewer__book.is-static { display: block; }
.viewer__book.is-static .vpage { position: relative; }

/* Grundstile der Blätter-Bibliothek */
.stf__parent { position: relative; display: block; box-sizing: border-box; transform: translateZ(0); touch-action: pan-y; }
.stf__wrapper { position: relative; width: 100%; height: 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; }

.vpage { background: #fff; overflow: hidden; }
.vpage__paper { position: absolute; inset: 0; background: #fbfbfa; }
.vpage__paper::before { /* sanfter Ladeschimmer, solange die Seite noch nicht gezeichnet ist */
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(0,0,0,0) 35%, rgba(0,0,0,.035) 50%, rgba(0,0,0,0) 65%);
  background-size: 300% 100%; animation: vshimmer 1.6s linear infinite;
}
@keyframes vshimmer { from { background-position: 150% 0; } to { background-position: -150% 0; } }
.vpage__img, .vpage__canvas { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; background: #fff; }
.vpage__canvas { opacity: 0; transition: opacity .35s ease; }
.vpage__canvas.is-ready { opacity: 1; }
/* Falz in der Buchmitte */
.is-double .vpage.--left .vpage__paper::after,
.is-double .vpage.--right .vpage__paper::after {
  content: ""; position: absolute; top: 0; bottom: 0; width: 9%; z-index: 2; pointer-events: none;
}
.is-double .vpage.--left .vpage__paper::after { right: 0; background: linear-gradient(270deg, rgba(0,0,0,.16), rgba(0,0,0,.05) 35%, rgba(0,0,0,0)); }
.is-double .vpage.--right .vpage__paper::after { left: 0; background: linear-gradient(90deg, rgba(0,0,0,.18), rgba(0,0,0,.05) 30%, rgba(0,0,0,0)); }
.is-double .vpage[data-density="hard"] .vpage__paper::after { display: none; }

.viewer__nav {
  position: absolute; top: 50%; z-index: 5; width: 56px; height: 56px; margin-top: -28px;
  display: grid; place-items: center; border-radius: 50%; cursor: pointer;
  border: 1px solid rgba(255,255,255,.16); background: rgba(255,255,255,.07); color: #fff;
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
  transition: background-color .2s, transform .25s cubic-bezier(.2,.7,.1,1), opacity .2s;
}
.viewer__nav svg { width: 24px; height: 24px; }
.viewer__nav:hover { background: rgba(255,255,255,.16); transform: scale(1.06); }
.viewer__nav:disabled { opacity: 0; pointer-events: none; }
.viewer__nav--prev { left: 20px; }
.viewer__nav--next { right: 20px; }
.viewer.is-one .viewer__nav { display: none; }

.viewer__status { position: absolute; inset: 0; z-index: 6; display: grid; place-content: center; gap: 14px; text-align: center; background: rgba(39,43,46,.92); font-size: 17px; }
.viewer__status-link { justify-self: center; color: #e4ed64; }

.viewer__foot { display: flex; align-items: center; justify-content: center; padding: 0 24px; padding-bottom: env(safe-area-inset-bottom); }
.viewer__scrub { width: min(560px, 100%); accent-color: #e4ed64; -webkit-appearance: none; appearance: none; background: transparent; height: 32px; cursor: pointer; }
.viewer__scrub::-webkit-slider-runnable-track { height: 3px; border-radius: 3px; background: rgba(255,255,255,.22); }
.viewer__scrub::-moz-range-track { height: 3px; border-radius: 3px; background: rgba(255,255,255,.22); }
.viewer__scrub::-webkit-slider-thumb { -webkit-appearance: none; width: 18px; height: 18px; margin-top: -7.5px; border-radius: 50%; background: #e4ed64; border: 0; box-shadow: 0 2px 8px rgba(0,0,0,.4); }
.viewer__scrub::-moz-range-thumb { width: 18px; height: 18px; border-radius: 50%; background: #e4ed64; border: 0; }
.viewer.is-one .viewer__foot { visibility: hidden; }

/* Seitenübersicht */
.viewer__thumbs {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 8; height: 186px;
  overflow-x: auto; overflow-y: hidden; overscroll-behavior: contain;
  background: rgba(30,33,35,.94); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid rgba(255,255,255,.08);
  animation: vslideup .4s cubic-bezier(.2,.7,.1,1);
}
@keyframes vslideup { from { transform: translateY(100%); } to { transform: none; } }
.viewer__thumbs-track { display: flex; gap: 14px; padding: 22px 24px; width: max-content; }
.vthumb {
  --r: .707; position: relative; flex: none; padding: 0; border: 0; background: none; cursor: pointer;
  display: flex; flex-direction: column; align-items: center; gap: 8px; color: rgba(255,255,255,.6); font-size: 12px;
}
.vthumb__img { display: block; height: 116px; width: calc(116px * var(--r)); background: rgba(255,255,255,.12); border-radius: 2px; overflow: hidden; box-shadow: 0 0 0 2px transparent; transition: box-shadow .2s, transform .2s; }
.vthumb__img canvas { width: 100%; height: 100%; display: block; }
.vthumb:hover .vthumb__img { transform: translateY(-3px); }
.vthumb.is-current .vthumb__img { box-shadow: 0 0 0 2px #e4ed64; }
.vthumb.is-current { color: #e4ed64; }

/* Lupe */
.viewer__zoom { position: absolute; inset: 0; z-index: 9; background: #1f2325; animation: vfade .25s ease; }
@keyframes vfade { from { opacity: 0; } }
.viewer__zoom-scroll { position: absolute; inset: 0; overflow: auto; cursor: grab; overscroll-behavior: contain; }
.viewer__zoom-scroll.is-panning { cursor: grabbing; user-select: none; }
.viewer__zoom-inner { display: flex; justify-content: center; gap: 0; min-width: min-content; padding: 24px 16px 96px; }
.vzoom__page { flex: none; width: var(--zw); height: var(--zh); background: #fff; box-shadow: 0 20px 40px rgba(0,0,0,.4); }
.vzoom__page canvas { width: 100%; height: 100%; display: block; }
.viewer__zoom-bar { position: absolute; left: 50%; bottom: 20px; transform: translateX(-50%); display: flex; gap: 4px; padding: 6px; border-radius: 16px; background: rgba(53,59,63,.95); box-shadow: 0 12px 30px rgba(0,0,0,.4); }

.viewer__toast {
  position: absolute; left: 50%; bottom: 74px; z-index: 12; transform: translate(-50%, 12px);
  padding: 10px 16px; border-radius: 12px; background: #e4ed64; color: #23292c; font-size: 15px; font-weight: 600;
  opacity: 0; pointer-events: none; transition: opacity .25s, transform .25s;
}
.viewer__toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

.viewer__flyer {
  position: fixed; z-index: 101; margin: 0; object-fit: cover; pointer-events: none;
  border-radius: 2px 5px 5px 2px; box-shadow: 0 30px 60px -20px rgba(0,0,0,.6);
  transition: transform .62s cubic-bezier(.3,.75,.15,1), opacity .25s ease, border-radius .62s;
}
.viewer__flyer.is-flying { border-radius: 0; }
.viewer__flyer.is-done { opacity: 0; }

@media (max-width: 720px) {
  .viewer { --bar-h: 58px; --foot-h: 52px; }
  .viewer__bar { grid-template-columns: 1fr auto; padding-left: 16px; padding-right: 8px; }
  .viewer__count { display: none; }
  .viewer__actions [data-act="fullscreen"], .viewer__actions [data-act="share"] { display: none; }
  .vbtn { width: 40px; height: 40px; }
  .viewer__nav { display: none; }
  .viewer__foot { flex-direction: column; gap: 0; }
  .viewer__thumbs { height: 160px; }
  .vthumb__img { height: 96px; width: calc(96px * var(--r)); }
}
@media (max-width: 720px) {
  .viewer__foot::before { content: attr(data-count); font-size: 13px; color: rgba(255,255,255,.72); font-variant-numeric: tabular-nums; }
  .viewer__scrub { height: 26px; }
}
@media (prefers-reduced-motion: reduce) {
  .viewer, .viewer__bookwrap, .viewer__flyer, .vpage__canvas { transition: none !important; }
  .vpage__paper::before { animation: none; }
}