.etb-pdf-toggle,
.etb-pdf-actions button,
.etb-pdf-actions a {
  align-items: center;
  background: #fff;
  border: 1px solid #bdc8dd;
  border-radius: 6px;
  color: #273650;
  cursor: pointer;
  display: inline-flex;
  font: inherit;
  justify-content: center;
  min-height: 44px;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.etb-pdf-toggle {
  font-size: .86rem;
  font-weight: 850;
  gap: 8px;
  padding: 8px 13px;
}

.etb-pdf-toggle:hover,
.etb-pdf-toggle.is-active,
.etb-pdf-actions button:hover,
.etb-pdf-actions a:hover {
  background: #f4f2ff;
  border-color: #8170ee;
  color: #4c3dcc;
}

.etb-pdf-toggle:focus-visible,
.etb-pdf-actions button:focus-visible,
.etb-pdf-actions a:focus-visible,
.etb-pdf-page-control input:focus-visible {
  outline: 3px solid rgba(103, 86, 232, .34);
  outline-offset: 2px;
}

.etb-pdf-icon,
.etb-pdf-icon svg {
  display: block;
  height: 20px;
  width: 20px;
}

.etb-pdf-icon svg {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.etb-page-link.is-active-reference {
  background: #ece9ff;
  border-color: #7664ea;
  box-shadow: 0 0 0 2px rgba(103, 86, 232, .12);
  color: #4939ca;
}

.etb-pdf-compare[hidden] {
  display: none !important;
}

.etb-pdf-compare {
  background: #fff;
  border: 1px solid #cfd8e7;
  box-shadow: 0 16px 40px rgba(35, 46, 73, .12);
  display: flex;
  flex-direction: column;
  min-height: 620px;
  min-width: 0;
  overflow: hidden;
  scroll-margin-top: 92px;
}

.etb-pdf-compare-head {
  align-items: center;
  background: #fff;
  border-bottom: 1px solid #dce3ef;
  display: flex;
  flex: 0 0 auto;
  gap: 14px;
  justify-content: space-between;
  min-height: 66px;
  padding: 10px 12px 10px 15px;
}

.etb-pdf-title {
  align-items: center;
  display: flex;
  gap: 10px;
  min-width: 0;
}

.etb-pdf-title > .etb-pdf-icon {
  background: #eeebff;
  color: #5543d1;
  display: grid;
  flex: 0 0 42px;
  height: 42px;
  place-items: center;
  width: 42px;
}

.etb-pdf-title > span {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.etb-pdf-title small {
  color: #7462e6;
  font-size: .66rem;
  font-weight: 850;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.etb-pdf-title strong {
  color: #1d2b43;
  font-size: .9rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.etb-pdf-actions {
  align-items: center;
  display: flex;
  flex: 0 0 auto;
  gap: 6px;
}

.etb-pdf-actions button,
.etb-pdf-actions a {
  padding: 0;
  text-decoration: none;
  width: 44px;
}

.etb-pdf-page-control {
  align-items: center;
  background: #f7f8fb;
  border: 1px solid #d7deea;
  border-radius: 6px;
  color: #5f6c82;
  display: flex;
  font-size: .72rem;
  font-weight: 800;
  gap: 5px;
  height: 44px;
  padding: 0 7px 0 10px;
}

.etb-pdf-page-control input {
  background: #fff;
  border: 1px solid #c7d0df;
  border-radius: 4px;
  color: #1c2a42;
  font: inherit;
  font-size: .82rem;
  height: 30px;
  padding: 0 4px;
  text-align: center;
  width: 48px;
}

.etb-pdf-compare-caption {
  align-items: baseline;
  background: #f7f8fc;
  border-bottom: 1px solid #dce3ef;
  display: flex;
  flex: 0 0 auto;
  flex-wrap: wrap;
  gap: 4px 10px;
  min-height: 48px;
  padding: 9px 15px;
}

.etb-pdf-compare-caption strong {
  color: #25344e;
  font-size: .82rem;
}

.etb-pdf-compare-caption span {
  color: #66738a;
  font-size: .76rem;
}

.etb-pdf-viewer {
  background: #e9edf4;
  border: 0;
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
  position: relative;
}

.etb-pdf-viewer .textbook-pdf-stage {
  height: 100%;
  min-height: 0;
  overflow: auto;
  padding: 14px;
  scrollbar-gutter: stable;
}

.etb-pdf-viewer .textbook-pdf-page {
  box-shadow: 0 8px 22px rgba(20, 30, 50, .2);
  margin: 0 auto;
}

.etb-pdf-viewer .textbook-pdf-highlight-layer {
  display: none;
}

.etb-pdf-viewer .textbook-pdf-page-badge {
  left: auto;
  right: 16px;
}

html[data-theme="night"] .etb-pdf-toggle,
html[data-theme="night"] .etb-pdf-compare,
html[data-theme="night"] .etb-pdf-compare-head,
html[data-theme="night"] .etb-pdf-actions button,
html[data-theme="night"] .etb-pdf-actions a {
  background: #1b2539;
  border-color: #46536c;
  color: #edf2ff;
}

html[data-theme="night"] .etb-pdf-title strong { color: #edf2ff; }
html[data-theme="night"] .etb-pdf-compare-caption { background: #222f46; border-color: #46536c; }
html[data-theme="night"] .etb-pdf-compare-caption strong { color: #edf2ff; }
html[data-theme="night"] .etb-pdf-compare-caption span { color: #b7c1d6; }
html[data-theme="night"] .etb-pdf-page-control { background: #222f46; border-color: #46536c; color: #cbd4e7; }
html[data-theme="night"] .etb-pdf-page-control input { background: #172034; border-color: #526079; color: #edf2ff; }
html[data-theme="night"] .etb-pdf-viewer { background: #101827; }

@media (min-width: 1180px) {
  .etb-reading-layout.etb-pdf-compare-active {
    grid-template-columns: minmax(0, .93fr) minmax(500px, 1.07fr);
  }

  .etb-reading-layout.etb-pdf-compare-active > .etb-toc,
  .etb-reading-layout.etb-pdf-compare-active > .etb-margin-column {
    display: none;
  }

  .etb-reading-layout.etb-pdf-compare-active > .etb-reading-column,
  .etb-reading-layout.etb-pdf-compare-active > .etb-pdf-compare {
    grid-row: 1;
  }

  .etb-reading-layout.etb-pdf-compare-active > .etb-reading-column { grid-column: 1; }
  .etb-reading-layout.etb-pdf-compare-active > .etb-pdf-compare { grid-column: 2; }

  .etb-pdf-compare {
    height: calc(100vh - 104px);
    max-height: 980px;
    position: sticky;
    top: 86px;
  }
}

@media (min-width: 1720px) {
  .etb-reading-layout.etb-pdf-compare-active {
    grid-template-columns: 190px minmax(500px, .88fr) minmax(620px, 1.12fr);
  }

  .etb-reading-layout.etb-pdf-compare-active > .etb-toc {
    display: flex;
    grid-column: 1;
    grid-row: 1;
  }

  .etb-reading-layout.etb-pdf-compare-active > .etb-reading-column { grid-column: 2; }
  .etb-reading-layout.etb-pdf-compare-active > .etb-pdf-compare { grid-column: 3; }
}

@media (max-width: 1179px) {
  .etb-reading-layout.etb-pdf-compare-active {
    grid-template-columns: 1fr;
  }

  .etb-reading-layout.etb-pdf-compare-active > .etb-toc,
  .etb-reading-layout.etb-pdf-compare-active > .etb-reading-column,
  .etb-reading-layout.etb-pdf-compare-active > .etb-pdf-compare,
  .etb-reading-layout.etb-pdf-compare-active > .etb-margin-column {
    grid-column: 1;
  }

  .etb-reading-layout.etb-pdf-compare-active > .etb-toc { grid-row: 1; }
  .etb-reading-layout.etb-pdf-compare-active > .etb-reading-column { grid-row: 2; }
  .etb-reading-layout.etb-pdf-compare-active > .etb-pdf-compare { grid-row: 3; }
  .etb-reading-layout.etb-pdf-compare-active > .etb-margin-column { grid-row: 4; }

  .etb-pdf-compare {
    height: min(76vh, 760px);
    min-height: 540px;
    position: static;
  }
}

@media (max-width: 680px) {
  .etb-pdf-toggle { width: 100%; }

  .etb-pdf-compare {
    height: 72vh;
    min-height: 510px;
  }

  .etb-pdf-compare-head {
    align-items: stretch;
    flex-direction: column;
    padding: 12px;
  }

  .etb-pdf-actions {
    display: grid;
    grid-template-columns: 44px minmax(102px, 1fr) 44px 44px 44px;
  }

  .etb-pdf-page-control { justify-content: center; }
  .etb-pdf-actions button, .etb-pdf-actions a { width: 100%; }
  .etb-pdf-compare-caption { align-items: flex-start; flex-direction: column; }
  .etb-pdf-viewer .textbook-pdf-stage { padding: 9px; }
}

@media (prefers-reduced-motion: reduce) {
  .etb-pdf-toggle,
  .etb-pdf-actions button,
  .etb-pdf-actions a { transition-duration: .01ms !important; }
}