/* Final reader-quality layer.  It intentionally comes after legacy reader
   skins so every Aasta manuscript shares one calm, book-first presentation. */

#readerView {
  --aasta-reader-ink: #2a211c;
  --aasta-reader-cream: #f7f0df;
  --aasta-reader-control: #f3e6d2;
  --aasta-reader-accent: #a52834;
}

/* The application chrome belongs to the dim room, not the current paper
   theme. This prevents dark paper-theme icons on a dark reading bar. */
#readerView .reader-topbar,
#readerView .reader-topbar button,
#readerView .reader-topbar .icon-button,
#readerView .reader-topbar .chapter-pill,
#readerView .reader-topbar .chapter-pill * {
  color: var(--aasta-reader-control) !important;
}

#readerView .reader-topbar .icon-button,
#readerView > .reader-topbar > #exitReaderButton {
  border-radius: 4px;
  opacity: .92;
}

#readerView .reader-topbar .icon-button:hover,
#readerView .reader-topbar .icon-button:focus-visible,
#readerView > .reader-topbar > #exitReaderButton:hover,
#readerView > .reader-topbar > #exitReaderButton:focus-visible,
#readerView .chapter-pill:hover,
#readerView .chapter-pill:focus-visible {
  color: #fff8ed !important;
  outline: 2px solid rgba(224, 173, 95, .72);
  outline-offset: -3px;
  background: rgba(255, 246, 226, .1) !important;
}

#readerView > .reader-topbar > #chapterMenuButton {
  min-width: 112px;
  padding-inline: 13px;
}

/* Give real facing pages a bookish measure and breathing room. The measuring
   page uses the same metrics, so pagination remains honest. */
#readerView[data-reader-view='spread'].flipbook-spread-mode {
  --flipbook-width: min(1590px, calc(100vw - clamp(52px, 6vw, 148px)));
  --flipbook-height: min(842px, calc(100dvh - 132px));
  --flipbook-pad-x: clamp(58px, 5vw, 102px);
  --flipbook-pad-y: clamp(48px, 5.2vh, 76px);
}

#readerView[data-reader-view='spread'] :is(.measure-page, .flipbook-physical-page, .flipbook-leaf-face) .reader-block-paragraph,
#readerView[data-reader-view='spread'] :is(.measure-page, .flipbook-physical-page, .flipbook-leaf-face) .reader-block-body,
#readerView[data-reader-view='spread'] :is(.measure-page, .flipbook-physical-page, .flipbook-leaf-face) li {
  max-width: 49ch;
  margin-inline: auto;
  font-size: var(--reader-font-size);
  line-height: var(--reader-line-height);
  letter-spacing: .002em;
  color: var(--aasta-reader-ink);
}

#readerView[data-reader-view='spread'] :is(.flipbook-left-page, .flipbook-leaf-face.flipbook-left-page) .reader-block,
#readerView[data-reader-view='spread'] :is(.flipbook-left-page, .flipbook-leaf-face.flipbook-left-page) .reader-block-body {
  transform: translateX(clamp(2px, .45vw, 9px));
}

#readerView[data-reader-view='spread'] :is(.flipbook-right-page, .flipbook-leaf-face.flipbook-right-page) .reader-block,
#readerView[data-reader-view='spread'] :is(.flipbook-right-page, .flipbook-leaf-face.flipbook-right-page) .reader-block-body {
  transform: translateX(-5px);
}

#readerView[data-reader-view='spread'] :is(.measure-page, .flipbook-physical-page, .flipbook-leaf-face) .reader-block-paragraph + .reader-block-paragraph {
  margin-block-start: .42em;
  text-indent: 1.42em;
}

#readerView[data-reader-view='spread'] :is(.measure-page, .flipbook-physical-page, .flipbook-leaf-face) .reader-block-chapter-heading + .reader-block-paragraph,
#readerView[data-reader-view='spread'] :is(.measure-page, .flipbook-physical-page, .flipbook-leaf-face) .reader-dropcap {
  text-indent: 0;
}

#readerView[data-reader-view='spread'] :is(.measure-page, .flipbook-physical-page, .flipbook-leaf-face) .reader-block-chapter-heading {
  margin: clamp(12px, 2vh, 28px) auto clamp(40px, 7vh, 82px);
  text-align: center;
}

#readerView[data-reader-view='spread'] :is(.measure-page, .flipbook-physical-page, .flipbook-leaf-face) .reader-block-chapter-heading h1 {
  max-width: 15ch;
  font-size: clamp(38px, 3.25vw, 58px);
  line-height: 1.08;
}

/* The arrows are quiet edge affordances instead of heavy circular controls. */
#readerView.flipbook-spread-mode .page-controls button {
  width: 42px;
  min-width: 42px;
  height: 86px;
  min-height: 86px;
  border: 0;
  border-radius: 0;
  color: rgba(73, 55, 39, .72);
  background: transparent;
  box-shadow: none;
  opacity: .72;
  font-size: 34px;
}

#readerView.flipbook-spread-mode .page-controls button:hover,
#readerView.flipbook-spread-mode .page-controls button:focus-visible {
  color: var(--aasta-reader-ink);
  background: rgba(255, 252, 239, .46);
  outline: 1px solid rgba(88, 61, 39, .25);
  outline-offset: 2px;
}

/* A visible, restrained paper leaf for desktop spreads. */
#readerView.flipbook-spread-mode .flipbook-turn-leaf {
  perspective: 2200px;
  filter: drop-shadow(0 12px 17px rgba(25, 14, 8, .24));
}

#readerView.flipbook-spread-mode .flipbook-turn-leaf::after {
  opacity: .92;
}

#readerView.flipbook-spread-mode .flipbook-turn-forward.flipbook-leaf-animate {
  animation: aastaPremiumPhysicalPageForward 440ms cubic-bezier(.2,.7,.16,1) both;
}

#readerView.flipbook-spread-mode .flipbook-turn-previous.flipbook-leaf-animate {
  animation: aastaPremiumPhysicalPagePrevious 440ms cubic-bezier(.2,.7,.16,1) both;
}

#readerView.flipbook-spread-mode .flipbook-turn-leaf.flipbook-leaf-animate::after {
  animation: aastaPremiumFoldShadow 440ms ease both;
}

@keyframes aastaPremiumPhysicalPageForward {
  0% { opacity: 1; transform: rotateY(0deg) skewY(0); }
  45% { opacity: 1; transform: rotateY(-76deg) skewY(-.4deg); }
  100% { opacity: .98; transform: rotateY(-180deg) skewY(0); }
}

@keyframes aastaPremiumPhysicalPagePrevious {
  0% { opacity: 1; transform: rotateY(0deg) skewY(0); }
  45% { opacity: 1; transform: rotateY(76deg) skewY(.4deg); }
  100% { opacity: .98; transform: rotateY(180deg) skewY(0); }
}

@keyframes aastaPremiumFoldShadow {
  0%, 100% { opacity: .12; }
  48% { opacity: .66; }
}

/* Single-page devices receive the same physical cue, never a generic slide. */
#readerView[data-reader-view='single'] .single-page-turn-leaf {
  z-index: 20;
  overflow: visible;
  transform-style: preserve-3d;
  perspective: 1800px;
  background: var(--reader-page);
  box-shadow: 0 18px 34px rgba(20, 12, 7, .3);
}

#readerView[data-reader-view='single'] .single-page-turn-next { transform-origin: left center !important; }
#readerView[data-reader-view='single'] .single-page-turn-previous { transform-origin: right center !important; }
#readerView[data-reader-view='single'] .single-page-turn-face,
#readerView[data-reader-view='single'] .single-page-turn-back {
  display: block !important;
  position: absolute !important;
  inset: 0 !important;
  width: 100% !important;
  height: 100% !important;
  backface-visibility: hidden !important;
}
#readerView[data-reader-view='single'] .single-page-turn-back {
  background: var(--reader-page) !important;
  transform: rotateY(180deg);
}
#readerView[data-reader-view='single'] .single-page-turn-previous .single-page-turn-back { transform: rotateY(-180deg); }
#readerView[data-reader-view='single'] .single-page-turn-leaf::after {
  display: block !important;
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(90deg, rgba(38, 20, 9, .28), transparent 32%, rgba(255, 255, 255, .12));
}

@keyframes aastaSinglePageTurnNext {
  0% { opacity: 1; transform: rotateY(0); }
  52% { opacity: 1; transform: rotateY(-88deg); }
  100% { opacity: .98; transform: rotateY(-180deg); }
}
@keyframes aastaSinglePageTurnPrevious {
  0% { opacity: 1; transform: rotateY(0); }
  52% { opacity: 1; transform: rotateY(88deg); }
  100% { opacity: .98; transform: rotateY(180deg); }
}

@media (max-width: 899px) {
  #readerView .reader-topbar .icon-button,
  #readerView > .reader-topbar > #exitReaderButton { color: var(--aasta-reader-control) !important; }
  #readerView .reader-block-paragraph { line-height: 1.7; }
}

@media (prefers-reduced-motion: reduce) {
  #readerView .flipbook-turn-leaf,
  #readerView .single-page-turn-leaf { display: none !important; animation: none !important; }
}