/* =============================================================================
   General
   ========================================================================== */

.flipbook,
.flipbook-list {
  --flipbook-control: 2.5rem;
  /* Rounding follows --b-radius-s, override with --flipbook-radius */
  --flipbook-radius-s: var(--flipbook-radius, var(--b-radius-s, 0px));
  --flipbook-radius-m: calc(var(--flipbook-radius-s) * 2);
  --flipbook-round: min(50%, calc(var(--flipbook-radius-s) * 999));
  --flipbook-shadow: 0 2px 10px rgba(var(--c-neutral-darkest), 0.12);
}

.flipbook__button {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  text-decoration: none;
}

.flipbook__icon {
  flex-shrink: 0;
  width: 1.25em;
  height: 1.25em;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.flipbook li,
.flipbook-list li {
  margin: 0;
  list-style: none;
}

.flipbook__visuallyhidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.flipbook :focus-visible,
.flipbook-list :focus-visible {
  outline: 2px solid rgb(var(--c-primary));
  outline-offset: 2px;
}

.flipbook__panel :focus-visible,
.flipbook__nav:focus-visible {
  outline-offset: -2px;
}

html.flipbook-locked {
  overflow: hidden;
}

/* =============================================================================
   List
   ========================================================================== */

.flipbook-list {
  display: grid;
  gap: var(--g-gap);
  margin-bottom: var(--g-gap);
  padding: 0;
}

/* Every catalog is a card, phones show the cover on the left */
.flipbook-list__item {
  display: grid;
  grid-template-columns: 38% 1fr;
  overflow: hidden;
  border-radius: calc(var(--flipbook-radius-m) * 2);
  background-color: rgb(var(--c-neutral-lightest));
  box-shadow: 0 1px 3px rgba(var(--c-neutral-darkest), 0.08), 0 8px 24px rgba(var(--c-neutral-darkest), 0.06);
}

.flipbook-list__media {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--g-gap-s);
  background-color: rgb(var(--c-neutral-lighter));
}

.flipbook-list__cover {
  position: relative;
  display: block;
  width: 100%;
  text-transform: none;
}

.flipbook-list__thumbnail {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1 / 1.1;
}

.flipbook-list__thumbnail img,
.flipbook-list__placeholder {
  display: block;
  max-width: 100%;
  max-height: 100%;
  border-radius: var(--flipbook-radius-s);
  box-shadow: 0 4px 14px rgba(var(--c-neutral-darkest), 0.18);
}

.flipbook-list__thumbnail img {
  width: auto;
  height: auto;
}

.flipbook-list__placeholder {
  width: 70%;
  aspect-ratio: 1 / 1.414;
  background-color: rgb(var(--c-neutral-lightest));
}

.flipbook-list__open {
  position: absolute;
  top: 50%;
  left: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--flipbook-round);
  background-color: rgb(var(--c-neutral-lightest));
  box-shadow: 0 6px 18px rgba(var(--c-neutral-darkest), 0.25);
  color: rgb(var(--c-primary));
  opacity: 0;
  transform: translate(-50%, -40%);
  transition: opacity 0.25s, transform 0.25s;
}

.flipbook-list__open .flipbook__icon {
  width: 1.6rem;
  height: 1.6rem;
}

.flipbook-list__item:hover .flipbook-list__open {
  opacity: 1;
  transform: translate(-50%, -50%);
}

.flipbook-list__body {
  display: flex;
  flex-direction: column;
  gap: var(--g-gap-s);
  padding: var(--g-gap-s);
}

.flipbook-list__text {
  display: flex;
  flex-direction: column;
  gap: 0.25em;
}

.flipbook-list__title {
  margin: 0;
  font-size: var(--f-size-l-2);
  line-height: 1.3;
  hyphens: manual;
  overflow-wrap: break-word;
}

.flipbook-list__meta,
.flipbook__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0 0.5em;
  margin: 0;
  color: rgb(var(--c-neutral-dark));
  font-size: var(--f-size-s-1);
}

.flipbook-list__meta span + span::before,
.flipbook__meta span + span::before {
  content: '·';
  margin-right: 0.5em;
}

.flipbook-list__description {
  margin: 0.25em 0 0;
  color: rgb(var(--c-neutral-darker));
}

.flipbook-list__actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  margin-top: auto;
}

.flipbook-list__empty {
  margin: 0;
  color: rgb(var(--c-neutral-dark));
}

/* =============================================================================
   Single view
   ========================================================================== */

.flipbook {
  display: flex;
  flex-direction: column;
  gap: var(--g-gap-s);
  margin-bottom: var(--g-gap);
  scroll-margin-top: calc(var(--m-scroll, 0px) + var(--g-gap));
}

.flipbook__back {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  gap: 0.5em;
  margin-bottom: var(--g-gap-s);
  text-decoration: none;
}

.flipbook__back .flipbook__icon {
  width: 1.15em;
  height: 1.15em;
  stroke-width: 2.5;
  transition: transform 0.2s;
}

.flipbook__back:hover .flipbook__icon,
.flipbook__back:focus-visible .flipbook__icon {
  transform: translateX(-3px);
}

.flipbook__header {
  display: flex;
  flex-direction: column;
  gap: 0.15em;
}

.flipbook__title {
  margin: 0;
}

.flipbook__description > :last-child {
  margin-bottom: 0;
}

.flipbook__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.flipbook__preparing {
  margin: 0;
  color: rgb(var(--c-neutral-dark));
}

.flipbook__notfound {
  margin: 0;
  color: rgb(var(--c-neutral-dark));
}

/* Viewer */
.flipbook__viewer {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--g-gap);
  margin-top: var(--g-gap-s);
}

.flipbook.-ready .flipbook__viewer {
  padding-top: var(--g-gap-s);
  /* The page corners and shadows of the page flip reach far beyond the book */
  overflow-x: hidden;
  overflow-x: clip;
}

.flipbook__book {
  /* The arrows stand next to the book on wide screens */
  --flipbook-nav-space: 0px;
  position: relative;
  box-sizing: border-box;
  width: 100%;
  max-width: calc(78vh * var(--page-ratio) * 2 + var(--flipbook-nav-space) * 2);
  padding-inline: var(--flipbook-nav-space);
  margin-inline: auto;
}

.flipbook__stage {
  display: grid;
  gap: var(--g-gap-s);
}

.flipbook__stage:focus-visible {
  outline: 2px solid rgb(var(--c-primary));
  outline-offset: 6px;
}

.flipbook__page {
  position: relative;
  background-color: rgb(var(--c-neutral-lightest));
}

.flipbook__page img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: var(--page-ratio);
  box-shadow: var(--flipbook-shadow);
}

.flipbook.-ready .flipbook__stage {
  display: block;
}

.flipbook.-ready .flipbook__page {
  position: absolute;
  box-shadow: var(--flipbook-shadow);
}

.flipbook.-ready .flipbook__page img {
  height: 100%;
  object-fit: contain;
  box-shadow: none;
}

.flipbook__nav {
  display: none;
  position: absolute;
  top: 50%;
  z-index: 2;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 0;
  border-radius: var(--flipbook-round);
  background-color: rgb(var(--c-neutral-lighter));
  color: rgb(var(--c-neutral-darkest));
  cursor: pointer;
  transform: translateY(-50%);
  transition: background-color 0.2s, color 0.2s, opacity 0.2s;
}

.flipbook__nav:hover,
.flipbook__nav:focus-visible {
  background-color: rgb(var(--c-primary));
  color: rgb(var(--c-neutral-lightest));
}

.flipbook__nav:disabled {
  opacity: 0;
  pointer-events: none;
}

.flipbook__nav.-prev {
  left: 0;
}

.flipbook__nav.-next {
  right: 0;
}

/* The fold in the middle of a spread */
.stf__wrapper.--landscape .flipbook__page.--left::after,
.stf__wrapper.--landscape .flipbook__page.--right::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  width: 5%;
  pointer-events: none;
}

.stf__wrapper.--landscape .flipbook__page.--left::after {
  right: 0;
  background: linear-gradient(to left, rgba(var(--c-neutral-darkest), 0.08), transparent);
}

.stf__wrapper.--landscape .flipbook__page.--right::after {
  left: 0;
  background: linear-gradient(to right, rgba(var(--c-neutral-darkest), 0.06), transparent);
}

/* Links */
.flipbook__link {
  position: absolute;
  z-index: 1;
  display: block;
  border-radius: min(2px, var(--flipbook-radius-s));
  transition: background-color 0.2s;
}

/* The external link icon of gkmb_base would sit somewhere on the page image */
.flipbook .flipbook__link.flipbook__link::after {
  content: none;
}

.flipbook__link:hover,
.flipbook__link:focus-visible {
  background-color: rgba(var(--c-primary), 0.15);
  outline: 2px solid rgba(var(--c-primary), 0.6);
}

/* Search marks */
.flipbook__mark {
  position: absolute;
  z-index: 1;
  border-radius: min(2px, var(--flipbook-radius-s));
  background-color: rgb(255 214 0 / 0.45);
  box-shadow: 0 0 0 1px rgb(230 180 0 / 0.6);
  mix-blend-mode: multiply;
  pointer-events: none;
}

/* Zoom */
.flipbook__zoom {
  position: absolute;
  inset: 0 var(--flipbook-nav-space);
  z-index: 3;
  overflow: auto;
  overscroll-behavior: contain;
  border-radius: var(--flipbook-radius-s);
  background-color: rgb(var(--c-neutral-lightest));
  box-shadow: var(--flipbook-shadow);
  cursor: grab;
}

.flipbook__zoom[hidden] {
  display: none;
}

.flipbook__zoom.-dragging {
  cursor: grabbing;
  user-select: none;
}

.flipbook__zoomcontent {
  display: flex;
  margin-inline: auto;
}

.flipbook__zoompage {
  position: relative;
  flex: 1 1 0;
}

.flipbook__zoompage img {
  display: block;
  width: 100%;
  height: auto;
  pointer-events: none;
}

/* Toolbar */
.flipbook__toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.375rem var(--g-gap-s);
  padding: 0.375rem;
  border-radius: var(--flipbook-radius-m);
  background-color: rgb(var(--c-neutral-lighter));
}

.flipbook__paging,
.flipbook__tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
}

.flipbook__paging[hidden] {
  display: none;
}

.flipbook__tool {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--flipbook-control);
  height: var(--flipbook-control);
  padding: 0;
  border: 0;
  border-radius: var(--flipbook-radius-m);
  background-color: transparent;
  color: rgb(var(--c-neutral-darkest));
  line-height: 1;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background-color 0.2s;
}

.flipbook__tool.-text {
  /* A row of its own on phones, the icons would wrap apart next to it */
  flex: 0 0 100%;
  gap: 0.4em;
  width: auto;
  padding: 0 0.6em;
  font: inherit;
  font-weight: var(--f-weight-sb);
}

a.flipbook__tool {
  text-decoration: none;
}

.flipbook__tool:hover,
.flipbook__tool:focus-visible {
  background-color: rgb(var(--c-neutral-lightest));
  box-shadow: 0 1px 4px rgba(var(--c-neutral-darkest), 0.12);
  color: rgb(var(--c-primary));
}

.flipbook__tool[aria-expanded="true"],
.flipbook__tool[aria-pressed="true"] {
  background-color: rgb(var(--c-primary));
  color: rgb(var(--c-neutral-lightest));
}

.flipbook__tool:disabled {
  opacity: 0.35;
  cursor: default;
  pointer-events: none;
}

.flipbook__tool[hidden] {
  display: none;
}

.flipbook__pageform {
  display: flex;
  align-items: center;
  margin: 0;
  font-variant-numeric: tabular-nums;
  font-weight: var(--f-weight-sb);
}

.flipbook__pageinput {
  box-sizing: border-box;
  height: var(--flipbook-control);
  margin: 0;
  padding: 0 0.25rem;
  background: rgb(var(--c-neutral-lightest));
  border: 1px solid rgb(var(--c-neutral-light));
  border-radius: var(--flipbook-radius-s);
  color: inherit;
  font: inherit;
  font-size: var(--f-size);
  line-height: 1;
  text-align: center;
}

.flipbook__pageinput:focus {
  border-color: rgb(var(--c-primary));
  outline: none;
  box-shadow: 0 0 0 3px rgba(var(--c-primary), 0.15);
}

.flipbook__pagetotal {
  padding: 0 0.25rem;
  font-size: var(--f-size);
  white-space: nowrap;
}

/* Phones page through by swiping, first and last page stay in the page overview */
.flipbook__paging [data-flipbook-action="first"],
.flipbook__paging [data-flipbook-action="last"] {
  display: none;
}

/* Panels */
.flipbook__panel {
  margin-top: calc(var(--g-gap-s) - var(--g-gap));
  padding: var(--g-gap-s);
  border-radius: var(--flipbook-radius-m);
  background-color: rgb(var(--c-neutral-lighter));
}

.flipbook__panel[hidden] {
  display: none;
}

.flipbook__toc,
.flipbook__searchresults,
.flipbook__share {
  margin: 0;
  padding: 0;
}

/* Lies over the catalog at its full height, closed until the button "Contents" opens it */
.flipbook__panel.-toc {
  position: absolute;
  inset: 0 auto 0 0;
  z-index: 5;
  width: min(22rem, 100%);
  margin: 0;
  overflow-y: auto;
  box-shadow: var(--flipbook-shadow);
  font-size: var(--f-size-s-1);
  animation: flipbook-toc-in 0.2s ease-out;
}

.flipbook__viewer.-fullscreen .flipbook__panel.-toc {
  max-height: none;
}

@keyframes flipbook-toc-in {
  from {
    transform: translateX(-100%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .flipbook__panel.-toc {
    animation: none;
  }
}

/* Head and search stay in view while a long table of contents scrolls */
.flipbook__tocfixed {
  position: sticky;
  top: calc(var(--g-gap-s) * -1);
  z-index: 1;
  margin: calc(var(--g-gap-s) * -1) calc(var(--g-gap-s) * -1) 0.5em;
  padding: var(--g-gap-s) var(--g-gap-s) 0.5em;
  background-color: rgb(var(--c-neutral-lighter));
}

.flipbook__tocsearch {
  display: block;
  margin-top: 0.5em;
}

.flipbook__tocnone {
  margin: 0;
  padding: 0.4em 0.75em;
  color: rgb(var(--c-neutral-dark));
}

.flipbook__tocnone[hidden] {
  display: none;
}

.flipbook__tochead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--g-gap-s);
  margin-bottom: 0.25em;
  padding-left: 0.75em;
}

.flipbook__tocheading {
  margin: 0;
  color: rgb(var(--c-neutral-dark));
  font-size: var(--f-size-s-1);
  font-weight: var(--f-weight-sb);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.flipbook__tocitem {
  break-inside: avoid;
}

.flipbook__toclink {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--g-gap-s);
  margin-bottom: 1px;
  padding: 0.4em 0.75em;
  font-size: var(--f-size-l-1);
  border-radius: var(--flipbook-radius-m);
  color: rgb(var(--c-neutral-darkest));
  font-weight: var(--f-weight-sb);
  text-decoration: none;
  text-transform: none;
  transition: background-color 0.2s, color 0.2s;
}

.flipbook__toclink:hover,
.flipbook__toclink:focus-visible {
  background-color: rgb(var(--c-neutral-lightest));
  color: rgb(var(--c-neutral-darkest));
}

.flipbook__toclink[aria-current] {
  box-shadow: inset 3px 0 0 rgb(var(--c-primary)), 0 1px 4px rgba(var(--c-neutral-darkest), 0.08);
  background-color: rgb(var(--c-neutral-lightest));
  color: rgb(var(--c-neutral-darkest));
}

.flipbook__tocitem[hidden] {
  display: none;
}

.flipbook__tocitem.-level1 .flipbook__toclink,
.flipbook__tocitem.-level2 .flipbook__toclink {
  padding-block: 0.2em;
  margin-bottom: 0;
}

.flipbook__tocitem.-level1 .flipbook__toclink {
  padding-left: 1.25em;
  font-weight: var(--f-weight-n);
}

.flipbook__tocitem.-level2 .flipbook__toclink {
  padding-left: 1.75em;
  font-size: var(--f-size);
  font-weight: var(--f-weight-n);
}

.flipbook__tocpage {
  flex-shrink: 0;
  color: rgb(var(--c-neutral-dark));
  font-variant-numeric: tabular-nums;
  font-weight: var(--f-weight-n);
}

.flipbook__searchlabel {
  display: block;
  margin-bottom: 0.4em;
  font-weight: var(--f-weight-sb);
}

.flipbook__searchfield {
  width: 100%;
  height: var(--flipbook-control);
  padding: 0 0.85em 0 2.5em;
  background: rgb(var(--c-neutral-lightest)) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='2' stroke-linecap='round'%3E%3Ccircle cx='10.5' cy='10.5' r='6.5'/%3E%3Cpath d='M15.5 15.5L20 20'/%3E%3C/svg%3E") no-repeat 0.75em center / 1.1em;
  border: 1px solid rgb(var(--c-neutral-light));
  border-radius: var(--flipbook-radius-m);
  font: inherit;
}

/* Browser and template styles set content-box for search fields */
.flipbook input.flipbook__searchfield {
  box-sizing: border-box;
}

.flipbook__searchfield:focus {
  border-color: rgb(var(--c-primary));
  outline: none;
  box-shadow: 0 0 0 3px rgba(var(--c-primary), 0.15);
}

.flipbook__searchstatus {
  margin: 0.75em 0 0.25em;
  color: rgb(var(--c-neutral-dark));
  font-size: var(--f-size-s-1);
}

.flipbook__searchstatus:empty {
  display: none;
}

/* Red text of the customer would lose contrast on the grey panel */
.flipbook__searchresults:not(:empty),
.flipbook__text {
  border-radius: var(--flipbook-radius-m);
  background-color: rgb(var(--c-neutral-lightest));
}

.flipbook__searchresults {
  max-height: 50vh;
  overflow-y: auto;
}

.flipbook__text {
  padding: var(--g-gap-s);
}

.flipbook__searchresult {
  display: flex;
  align-items: baseline;
  gap: var(--g-gap-s);
  width: 100%;
  padding: 0.6em 0.75em;
  border: 0;
  border-bottom: 1px solid rgb(var(--c-neutral-lighter));
  border-radius: 0;
  background: none;
  color: rgb(var(--c-neutral-darkest));
  font: inherit;
  line-height: 1.5;
  text-align: left;
  cursor: pointer;
}

/* A tinted background would lower the contrast of the red page number */
.flipbook__searchresult:hover,
.flipbook__searchresult:focus-visible {
  box-shadow: inset 3px 0 0 rgb(var(--c-primary));
  background: none;
  color: rgb(var(--c-neutral-darkest));
}

.flipbook__searchpage {
  flex: 0 0 4.5em;
  color: rgb(var(--c-primary));
  font-weight: var(--f-weight-sb);
}

.flipbook__searchsnippet mark {
  padding: 0;
  border-radius: min(2px, var(--flipbook-radius-s));
  background-color: rgba(var(--c-primary), 0.15);
  color: inherit;
  font-style: normal;
  font-weight: var(--f-weight-sb);
}

.flipbook__share {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.flipbook__sharelink {
  display: inline-flex;
  align-items: center;
  min-height: var(--flipbook-control);
  padding: 0 1em;
  border: 1px solid rgb(var(--c-neutral-light));
  border-radius: var(--flipbook-radius-s);
  background-color: rgb(var(--c-neutral-lightest));
  color: rgb(var(--c-neutral-darkest));
  font: inherit;
  font-weight: var(--f-weight-sb);
  line-height: 1.2;
  text-decoration: none;
  text-transform: none;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}

.flipbook__sharelink:hover,
.flipbook__sharelink:focus-visible {
  border-color: rgb(var(--c-primary));
  background-color: rgb(var(--c-neutral-lightest));
  color: rgb(var(--c-primary));
}

/* Share dialog */
.flipbook__dialog {
  width: min(32rem, calc(100vw - 2rem));
  max-height: calc(100dvh - 2rem);
  padding: 0;
  overflow-y: auto;
  border: 0;
  border-radius: var(--flipbook-radius-m);
  background-color: rgb(var(--c-neutral-lightest));
  box-shadow: var(--flipbook-shadow);
  color: rgb(var(--c-neutral-darkest));
}

.flipbook__dialog::backdrop {
  background-color: rgba(var(--c-neutral-darkest), 0.5);
}

.flipbook__dialogcontent {
  padding: var(--g-gap);
}

.flipbook__dialoghead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--g-gap-s);
  margin-bottom: var(--g-gap-s);
}

.flipbook__dialogtitle {
  margin: 0;
  font-size: var(--f-size-l-2);
}

/* QR code */
.flipbook__qr {
  display: none;
  margin-top: var(--g-gap);
}

.flipbook__qrcode {
  flex: 0 0 9rem;
  width: 9rem;
  height: 9rem;
}

.flipbook__qrcode svg {
  display: block;
  width: 100%;
  height: 100%;
}

.flipbook__qrtext {
  display: flex;
  flex-direction: column;
  gap: var(--g-gap-s);
}

.flipbook__qrhint {
  margin: 0;
  color: rgb(var(--c-neutral-dark));
}

.flipbook__qrdownloads {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* Text version */
.flipbook__text {
  max-height: 60vh;
  overflow-y: auto;
}

.flipbook__textpage {
  max-width: 75ch;
}

.flipbook__textpage + .flipbook__textpage {
  margin-top: var(--g-gap);
  padding-top: var(--g-gap-s);
  border-top: 1px solid rgb(var(--c-neutral-light));
}

.flipbook__textheading {
  margin: 0 0 0.5em;
  font-size: var(--f-size);
}

.flipbook__textpage p {
  margin: 0 0 0.75em;
  line-height: 1.6;
}

/* Thumbnails */
.flipbook__thumbnails {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  scroll-snap-type: x proximity;
}

.flipbook__thumbnail {
  flex: 0 0 4.5rem;
  padding: 0.3rem 0.3rem 0.2rem;
  border: 2px solid transparent;
  border-radius: var(--flipbook-radius-s);
  background: none;
  color: rgb(var(--c-neutral-dark));
  line-height: 1.2;
  cursor: pointer;
  scroll-snap-align: center;
  transition: border-color 0.2s, color 0.2s;
}

.flipbook__thumbnail img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: var(--page-ratio);
  box-shadow: 0 1px 4px rgba(var(--c-neutral-darkest), 0.2);
}

.flipbook__thumbnail:hover,
.flipbook__thumbnail:focus-visible,
.flipbook__thumbnail[aria-current] {
  border-color: rgb(var(--c-primary));
  background: none;
  color: rgb(var(--c-primary));
}

.flipbook__thumbnailnumber {
  display: block;
  margin-top: 0.3em;
  font-size: var(--f-size-s-1);
  text-align: center;
}

/* Fullscreen */
.flipbook__viewer.-fullscreen {
  position: fixed;
  inset: 0;
  z-index: 1000;
  justify-content: center;
  margin: 0;
  padding: var(--g-gap-s);
  border-radius: 0;
  background-color: rgb(var(--c-neutral-lightest));
  overflow: auto;
}

.flipbook__viewer.-fullscreen .flipbook__book {
  max-width: calc((100dvh - 9rem) * var(--page-ratio) * 2 + var(--flipbook-nav-space) * 2);
}

.flipbook__viewer.-fullscreen .flipbook__panel {
  flex-shrink: 0;
  max-height: 35vh;
  overflow-y: auto;
}

/* Page flip (StPageFlip, MIT) */
.stf__parent {
  position: relative;
  display: block;
  box-sizing: border-box;
  transform: translateZ(0);
  touch-action: pan-y;
}

.stf__wrapper {
  position: relative;
  width: 100%;
  box-sizing: border-box;
}

.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;
  top: 0;
  left: 0;
}

/* =============================================================================
   Media Queries
   ========================================================================== */

@media (min-width: 640px) {
  .flipbook-list.-below {
    grid-template-columns: repeat(2, 1fr);
  }

  .flipbook-list.-below .flipbook-list__item {
    display: flex;
    flex-direction: column;
  }

  .flipbook-list.-below .flipbook-list__media {
    padding: var(--g-gap);
  }

  .flipbook-list.-below .flipbook-list__body {
    flex-grow: 1;
    padding: var(--g-gap-s) var(--g-gap) var(--g-gap);
  }

  .flipbook-list__actions {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .flipbook-list.-beside .flipbook-list__item {
    grid-template-columns: 36% 1fr;
  }

  .flipbook-list.-beside .flipbook-list__media {
    padding: var(--g-gap);
  }

  .flipbook-list.-beside .flipbook-list__body {
    justify-content: center;
    padding: var(--g-gap) var(--g-gap) var(--g-gap) calc(var(--g-gap) * 0.75);
  }

  .flipbook__paging [data-flipbook-action="first"],
  .flipbook__paging [data-flipbook-action="last"] {
    display: inline-flex;
  }

  .flipbook__thumbnail {
    flex-basis: 5.5rem;
  }

  .flipbook__searchfield {
    max-width: 28rem;
  }

  .flipbook__tool.-text {
    flex: none;
  }

  .flipbook__qr {
    display: flex;
    align-items: center;
    gap: var(--g-gap-s);
  }
}

@media (min-width: 800px) {
  .flipbook,
  .flipbook-list {
    margin-bottom: calc(var(--g-gap) * 2);
  }

    .flipbook__viewer.-fullscreen {
    padding: var(--g-gap) var(--g-gap) var(--g-gap-s);
  }

  .flipbook__toolbar {
    justify-content: space-between;
  }

  .flipbook__panel {
    padding: var(--g-gap-s) var(--g-gap);
  }

  .flipbook__stage {
    grid-template-columns: repeat(2, 1fr);
  }

  .flipbook.-ready .flipbook__book {
    --flipbook-nav-space: 3.5rem;
  }

  .flipbook.-ready .flipbook__nav:not([hidden]) {
    display: flex;
  }

  .flipbook.-ready.-zoomed .flipbook__nav:not([hidden]) {
    display: none;
  }
}

@media (min-width: 1024px) {
  .flipbook-list.-below {
    grid-template-columns: repeat(3, 1fr);
  }

  .flipbook-list.-beside {
    grid-template-columns: repeat(2, 1fr);
  }
}


/* Windows high contrast: colors, backgrounds and shadows are replaced, states need system colors or outlines */
@media (forced-colors: active) {
  .flipbook__tool[aria-expanded="true"],
  .flipbook__tool[aria-pressed="true"] {
    forced-color-adjust: none;
    background-color: Highlight;
    color: HighlightText;
  }

  .flipbook__tool:disabled {
    color: GrayText;
  }

  .flipbook__nav {
    border: 1px solid ButtonText;
  }

  .flipbook__dialog {
    border: 1px solid CanvasText;
  }

  .flipbook__toclink[aria-current],
  .flipbook__thumbnail[aria-current] {
    outline: 3px solid Highlight;
    outline-offset: -3px;
  }

  .flipbook__pageinput:focus,
  .flipbook__searchfield:focus {
    outline: 2px solid Highlight;
    outline-offset: 0;
  }

  /* The marks have no text, without opting out they would disappear */
  .flipbook__mark {
    forced-color-adjust: none;
    background-color: Highlight;
    outline: 2px solid Highlight;
    opacity: 0.45;
    mix-blend-mode: normal;
  }

  .flipbook__link:hover,
  .flipbook__link:focus-visible {
    outline: 2px solid Highlight;
  }

  .flipbook__searchsnippet mark {
    forced-color-adjust: none;
    background-color: Mark;
    color: MarkText;
  }

  /* A QR code needs dark modules on a light background to be scanned */
  .flipbook__qrcode {
    forced-color-adjust: none;
  }
}