.material-book-section {
  padding: 72px var(--page-inset) 88px;
  background: linear-gradient(180deg, #fff, #eef6ff 38%, #f4f9ff 82%, #fff);
  color: var(--gm-ink);
  scroll-margin-top: 80px;
}
.material-book-section > h2 {
  max-width: 1320px;
  margin: 0 auto 38px;
  color: var(--gm-blue);
  font-size: 44px;
  font-weight: 600;
  line-height: 1.16;
  text-align: center;
  text-wrap: balance;
}
.material-book-selection {
  position: relative;
  max-width: 1260px;
  margin: 0 auto;
  padding: 0 48px 0 0;
  border: 0;
  min-width: 0;
}
.material-book-choice, .material-book-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.material-book {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, .4fr) minmax(0, .6fr);
  min-height: 650px;
  isolation: isolate;
  border-radius: 6px;
  background: var(--gm-blue);
  box-shadow: 0 24px 28px -16px rgb(18 45 74 / 36%), 0 6px 9px rgb(18 45 74 / 14%);
}
.material-book source { display: none; }
.material-book-cover {
  position: relative;
  padding: 66px 40px 40px 64px;
  border: 1px solid #12345c;
  border-radius: 6px 0 0 6px;
  color: #fff;
  background: linear-gradient(90deg, #1c4e7c, #143b6b 2%, #0e2b4e 3%, #24547e 5%, #164474 7%, #143b6b 80%, #183e67 94%, #0a2443 98%, #1d4d77);
  box-shadow: inset 0 2px 2px rgb(255 255 255 / 22%), inset 0 -2px 2px rgb(0 0 0 / 18%);
}
.material-book-logo {
  display: block;
  width: 100%;
  max-width: 300px;
  height: auto;
}
.material-book-index {
  display: grid;
  gap: 5px;
  margin: 110px -12px 0;
  max-width: 300px;
}
.material-book-index label {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  align-items: center;
  gap: 20px;
  min-height: 48px;
  padding: 10px 14px;
  border-radius: 18px;
  font-size: 18px;
  font-weight: 400;
  line-height: 1.35;
  cursor: pointer;
}
.material-book-index label > span:first-child { font-variant-numeric: tabular-nums; }
.material-book-pages {
  position: relative;
  min-width: 0;
  margin: 5px 10px 6px 0;
  z-index: 1;
  background: #fdfdfd;
  border-radius: 3% 1% 1% 3% / 1% 1% 1% 1%;
  box-shadow: -8px 0 12px -7px rgb(0 0 0 / 60%), 1px 1px 2px rgb(0 0 0 / 18%);
}
.material-book-pages::after {
  content: "";
  position: absolute;
  inset: 0 -9px 0 auto;
  width: 12px;
  border-radius: 0 5px 5px 0;
  background: repeating-linear-gradient(90deg, #d4d9de 0 1px, #fafafa 1px 3px);
  box-shadow: 1px 0 1px rgb(0 0 0 / 18%);
  pointer-events: none;
}
.material-book-page {
  display: none;
  grid-template-rows: auto minmax(260px, 1fr) auto;
  min-height: 639px;
  padding: 46px 44px 34px;
  background: linear-gradient(90deg, #dce0e3, #f8f9fa 2%, #fff 7%, #fdfdfd 92%, #f1f2f3 100%);
  border-radius: inherit;
  transform-origin: left center;
}
.material-book-page-heading h3 {
  margin: 0;
  color: var(--gm-blue);
  font-size: 40px;
  font-weight: 600;
  line-height: 1.18;
  text-wrap: balance;
}
.material-book-page-heading p {
  max-width: 37ch;
  margin-top: 12px;
  color: var(--gm-ink);
  font-size: 17px;
  line-height: 1.55;
}
.material-book-product {
  display: grid;
  place-items: center;
  min-width: 0;
}
.material-book-product img {
  display: block;
  width: 100%;
  height: 100%;
  max-height: 300px;
  object-fit: contain;
}
.material-book-page[data-chapter="baja"] .material-book-product img { height: auto; aspect-ratio: 2; object-fit: cover; }
.material-book-page-footer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px 16px;
  border-top: 1px solid var(--gm-line);
  padding-top: 18px;
}
.material-book-spec { grid-column: 1 / -1; }
.material-book-spec h4 {
  color: var(--gm-blue);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
}
.material-book-spec p {
  margin-top: 4px;
  color: var(--gm-blue);
  font-size: 16px;
  line-height: 1.5;
}
.material-book-link {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 11px 24px;
  border-radius: 999px;
  background: var(--gm-yellow);
  color: var(--gm-blue);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
  text-align: center;
}
.material-book-link:hover { background: var(--gm-yellow-hover); }
.material-book-folio {
  align-self: end;
  padding-bottom: 4px;
  color: var(--gm-blue);
  font-size: 13px;
  line-height: 1.4;
  font-variant-numeric: tabular-nums;
}
.material-book-tabs {
  position: absolute;
  left: 100%;
  top: 42px;
  bottom: 42px;
  display: grid;
  grid-template-rows: repeat(4, 1fr);
  gap: 10px;
  width: 46px;
  z-index: 0;
}
.material-book-tabs label {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 12px 9px;
  border-radius: 0 18px 18px 0;
  border: 1px solid rgb(255 255 255 / 50%);
  background: linear-gradient(90deg, #c7d3df, #edf0f3);
  color: var(--gm-blue);
  box-shadow: 3px 5px 8px rgb(20 59 107 / 12%);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
  writing-mode: vertical-rl;
  cursor: pointer;
}
#material-book-atap:checked ~ .material-book [data-chapter="atap"].material-book-page,
#material-book-baja:checked ~ .material-book [data-chapter="baja"].material-book-page,
#material-book-talang:checked ~ .material-book [data-chapter="talang"].material-book-page,
#material-book-semua:checked ~ .material-book [data-chapter="semua"].material-book-page {
  display: grid;
  animation: material-book-arrival .28s ease-out;
}
#material-book-atap:checked ~ .material-book label[data-chapter="atap"],
#material-book-baja:checked ~ .material-book label[data-chapter="baja"],
#material-book-talang:checked ~ .material-book label[data-chapter="talang"],
#material-book-semua:checked ~ .material-book label[data-chapter="semua"] {
  background: var(--gm-yellow);
  color: var(--gm-blue);
  font-weight: 600;
}
#material-book-atap:focus-visible ~ .material-book label[data-chapter="atap"],
#material-book-baja:focus-visible ~ .material-book label[data-chapter="baja"],
#material-book-talang:focus-visible ~ .material-book label[data-chapter="talang"],
#material-book-semua:focus-visible ~ .material-book label[data-chapter="semua"],
.material-book-link:focus-visible {
  outline: 3px solid var(--gm-blue);
  outline-offset: 4px;
}
.material-book-index label { outline-color: #fff !important; }
.material-book-catalogue { grid-template-rows: auto 1fr; gap: 20px; padding: 24px 0; }
.material-book-catalogue img.material-book-catalogue-logo {
  width: min(100%, 300px);
  height: auto;
}
.material-book-catalogue-products { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); align-items: center; width: 100%; }
.material-book-catalogue-products img { height: auto; }
@keyframes material-book-arrival {
  from { opacity: .4; transform: perspective(1600px) rotateY(-4deg); }
  to { opacity: 1; transform: none; }
}
@media (max-width: 1100px) {
  .material-book-section > h2 { font-size: 38px; }
  .material-book-cover { padding: 60px 28px 40px 44px; }
  .material-book-index label { gap: 14px; font-size: 16px; }
  .material-book-page { padding: 38px 32px 30px; }
  .material-book-page-heading h3 { font-size: 34px; }
}
@media (max-width: 760px) {
  .material-book-section { padding: 52px 20px 64px; scroll-margin-top: 68px; }
  .material-book-section > h2 { margin: 0 0 28px; font-size: 30px; text-align: left; }
  .material-book-selection { padding: 50px 2px 0 0; max-width: 580px; }
  .material-book { grid-template-columns: minmax(0, 1fr); min-height: 0; padding-left: 14px; }
  .material-book::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 0;
    width: 14px;
    border-radius: 5px 0 0 5px;
    background: linear-gradient(90deg, #0c2c50, #285c89 32%, #143b6b 62%, #0a2443);
    box-shadow: inset 1px 0 0 rgb(255 255 255 / 30%);
  }
  .material-book-cover { display: none; }
  .material-book-pages { margin: 3px 7px 4px 0; }
  .material-book-pages::after { right: -6px; width: 8px; }
  .material-book-page { grid-template-rows: auto minmax(210px, 1fr) auto; min-height: 572px; padding: 30px 22px 26px; }
  .material-book-page-heading h3 { font-size: 28px; line-height: 1.22; }
  .material-book-page-heading p { font-size: 15px; margin-top: 12px; }
  .material-book-product img { max-height: 240px; }
  .material-book-spec h4 { font-size: 16px; }
  .material-book-spec p { font-size: 14px; }
  .material-book-page-footer { gap: 16px 8px; padding-top: 16px; }
  .material-book-link { padding: 11px 18px; font-size: 13px; }
  .material-book-folio { font-size: 12px; }
  .material-book-tabs { left: 18px; right: 6px; top: -50px; bottom: auto; width: auto; height: 52px; grid-template-rows: none; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 3px; }
  .material-book-tabs label { writing-mode: horizontal-tb; border-radius: 15px 15px 0 0; padding: 9px 5px 11px; font-size: 12px; line-height: 1.25; text-align: center; }
  .material-book-catalogue { padding: 22px 0; }
}
@media (max-width: 359px) {
  .material-book-section { padding-inline: 16px; }
  .material-book-section > h2 { font-size: 28px; }
  .material-book-page { padding-inline: 18px; }
  .material-book-page-heading h3 { font-size: 26px; }
  .material-book-tabs { left: 14px; }
}
@media (prefers-reduced-motion: reduce) {
  .material-book-page { animation: none !important; }
}