/* ---------- preview / scene ---------- */
.preview__intro {
  display: grid;
  gap: 18px;
  max-width: 720px;
}
.scene {
  display: none;
  position: relative;
  height: 320svh;
  margin-top: 40px;
}
.reading {
  display: block;
  margin-top: 48px;
}
html.js .scene {
  display: block;
}
html.js .reading {
  display: none;
}
@media (prefers-reduced-motion: reduce), (max-height: 660px) {
  html.js .scene {
    display: none;
  }
  html.js .reading {
    display: block;
  }
}
.scene__stage {
  position: sticky;
  top: var(--header-h);
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  grid-template-areas: 'controls card' 'notice card';
  grid-template-rows: auto auto;
  align-content: center;
  align-items: center;
  column-gap: 64px;
  row-gap: 24px;
  height: calc(100svh - var(--header-h));
  padding: 24px 0;
}
.scene__card {
  grid-area: card;
  display: grid;
  padding: 36px 32px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--surface);
  box-shadow: var(--sh-hero);
  transform: rotate(-1.2deg);
}
.scene__layer {
  grid-area: 1 / 1;
  display: grid;
  align-content: center;
  gap: 22px;
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.4s ease, visibility 0.4s;
}
.scene__layer[data-on='true'] {
  visibility: visible;
  opacity: 1;
}
.scene__controls {
  grid-area: controls;
  display: grid;
  gap: 12px;
  max-width: 360px;
}
.scene__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.scene__notice {
  grid-area: notice;
  max-width: 360px;
}
.cmp {
  display: grid;
  gap: 4px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  color: var(--muted);
  transition: background-color 0.4s ease, border-color 0.4s ease, color 0.4s ease;
}
.cmp[data-emph='true'] {
  border-color: var(--pri-200);
  background: var(--pri-soft);
  color: var(--ink);
}
.cmp .sentence {
  font-size: 28px;
  line-height: 1.4;
}
.cmp .tr {
  font-size: 16px;
  color: inherit;
}
.cmp__explain {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink2);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.cmp__explain[data-on='true'] {
  opacity: 1;
  transform: none;
}

.reading__list {
  display: grid;
  gap: 12px;
}
.reading__item {
  display: grid;
  gap: 6px;
  padding: 20px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--surface);
  box-shadow: var(--sh-card);
}
.reading__item .sentence {
  font-size: 29px;
}
.reading__cmp {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}
.reading__cmp .sentence {
  font-size: 26px;
}

@media (max-width: 900px) {
  .scene__stage {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: 'card' 'controls' 'notice';
    row-gap: 20px;
    padding: 16px 0;
  }
  .scene__controls,
  .scene__notice {
    max-width: none;
  }
  .scene__card {
    padding: 22px 20px;
  }
}
@media (max-width: 480px) {
  .scene__card {
    transform: rotate(-0.8deg);
  }
  .scene__layer {
    gap: 14px;
  }
  .cmp {
    padding: 10px 14px;
  }
  .scene__stage .sentence {
    font-size: 27px;
  }
  .scene__stage .tr {
    font-size: 15px;
  }
  .scene__stage .cmp .sentence {
    font-size: 21px;
  }
  .scene__stage .cmp .tr,
  .scene__stage .cmp__explain {
    font-size: 14px;
    line-height: 1.65;
  }
  .scene__controls .btn {
    min-height: 44px;
    padding-block: 8px;
  }
  .scene__controls {
    gap: 8px;
  }
  .scene__row {
    gap: 8px;
  }
  .reading__item .sentence {
    font-size: 24px;
  }
  .reading__cmp .sentence {
    font-size: 22px;
  }
}