.page-lower--history {
  --history-blue: #075eae;
  --history-deep: #17365d;
  --history-sky: #e9faff;
  --history-sky-strong: #c9f0fb;
  --history-paper: #fffefa;
  --history-ink-soft: #38698e;
  --history-line: rgba(42, 148, 214, .22);
  --history-gold: #d9a441;
}

.page-lower--history .lower-main {
  background:
    radial-gradient(circle at 9% 26rem, rgba(159, 233, 246, .26), transparent 17rem),
    radial-gradient(circle at 86% 72rem, rgba(217, 164, 65, .11), transparent 18rem),
    linear-gradient(180deg, #fff 0%, #f7fdff 38%, #fff 100%);
}

@media (min-width: 1200px) {
  .page-lower--history .lower-breadcrumb,
  .page-lower--history .lower-hero__inner,
  .page-lower--history .lower-nav,
  .page-lower--history .lower-page-nav,
  .page-lower--history .lower-content,
  .page-lower--history .history-archive,
  .page-lower--history .history-points,
  .page-lower--history .history-faq,
  .page-lower--history .lower-related,
  .page-lower--history .lower-pager,
  .page-lower--history .lower-back {
    width: min(1680px, 100% - 64px);
  }

  .page-lower--history .lower-hero__inner {
    grid-template-columns: minmax(0, .78fr) minmax(480px, .84fr);
  }
}

.history-hero .lower-hero__inner {
  background:
    linear-gradient(90deg, rgba(255, 255, 255, .96) 0 40%, rgba(255, 255, 255, .28) 68%),
    radial-gradient(circle at 82% 16%, rgba(159, 233, 246, .38), transparent 16rem),
    linear-gradient(135deg, #fff 0%, #edfaff 52%, #d9f5fb 100%);
}

.history-hero__visual {
  aspect-ratio: 16 / 11;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .68), rgba(210, 240, 249, .5)),
    #effbff;
  box-shadow:
    inset 0 0 0 6px rgba(255, 255, 255, .68),
    0 18px 38px rgba(12, 111, 172, .16);
}

.history-hero__visual img {
  object-position: center 48%;
}

.history-hero__visual figcaption,
.history-photo-frame figcaption {
  position: absolute;
  z-index: 1;
  color: #fff;
  font-size: .78rem;
  font-weight: 700;
  line-height: 1.25;
  background: rgba(0, 72, 143, .78);
  border: 1px solid rgba(255, 255, 255, .38);
  border-radius: 999px;
  backdrop-filter: blur(6px);
}

.history-hero__visual figcaption {
  left: 1rem;
  bottom: 1rem;
  padding: .42rem .82rem;
}

.history-answer {
  background:
    radial-gradient(circle at 96% 12%, rgba(159, 233, 246, .22), transparent 8rem),
    linear-gradient(180deg, rgba(255, 255, 255, .98), rgba(247, 253, 255, .96));
}

.history-highlights {
  overflow: hidden;
}

.history-highlights::before {
  position: absolute;
  top: 1.1rem;
  right: 1.2rem;
  width: clamp(72px, 8vw, 132px);
  aspect-ratio: 1;
  content: "";
  background:
    radial-gradient(circle at 36% 34%, rgba(255, 255, 255, .92) 0 16%, transparent 17%),
    rgba(159, 233, 246, .24);
  border-radius: 50%;
}

.history-highlights__grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: clamp(.75rem, 1.4vw, 1rem);
  margin-top: clamp(1rem, 2vw, 1.4rem);
}

.history-highlight-card {
  position: relative;
  display: grid;
  align-content: start;
  gap: .55rem;
  min-height: 152px;
  padding: clamp(.9rem, 1.5vw, 1.18rem);
  color: var(--history-deep);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .96), rgba(244, 252, 255, .96)),
    #fff;
  border: 1px solid var(--history-line);
  border-radius: 8px;
  box-shadow: 0 12px 24px rgba(12, 111, 172, .08);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.history-highlight-card::after {
  position: absolute;
  right: .7rem;
  bottom: .7rem;
  width: 1.4rem;
  aspect-ratio: 1;
  content: "";
  border: 2px solid rgba(42, 148, 214, .2);
  border-radius: 50%;
}

.history-highlight-card time {
  color: #00488f;
  font-size: clamp(1.65rem, 2.8vw, 2.35rem);
  font-weight: 700;
  line-height: 1;
}

.history-highlight-card strong {
  color: var(--history-deep);
  font-size: clamp(.9rem, 1vw, 1rem);
  line-height: 1.55;
}

.history-highlight-card--anniversary {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, .96), rgba(255, 251, 237, .96)),
    #fff;
  border-color: rgba(217, 164, 65, .3);
}

.history-year-nav {
  justify-content: flex-start;
  overflow-x: auto;
  flex-wrap: nowrap;
  -webkit-overflow-scrolling: touch;
}

.history-year-nav a {
  flex: 0 0 auto;
}

.history-timeline {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 3vw, 2.4rem);
  margin-top: clamp(1.8rem, 4vw, 3.8rem);
  padding: 0;
  list-style: none;
}

.history-timeline::before {
  position: absolute;
  top: 8rem;
  right: auto;
  bottom: 1.4rem;
  left: clamp(1.6rem, 3vw, 2.4rem);
  width: 3px;
  height: auto;
  content: "";
  background: linear-gradient(180deg, rgba(42, 148, 214, .16), rgba(42, 148, 214, .62), rgba(217, 164, 65, .32));
  border-radius: 999px;
}

.history-timeline__head {
  position: relative;
  z-index: 1;
  padding: clamp(1.35rem, 3vw, 2.4rem);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .98), rgba(247, 253, 255, .95)),
    #fff;
  border: 1px solid var(--history-line);
  border-radius: 8px;
  box-shadow: 0 16px 34px rgba(12, 111, 172, .08);
}

.history-timeline__head h2 {
  margin: 0 0 .7rem;
  color: #00488f;
  font-size: clamp(1.55rem, 2.8vw, 2.5rem);
  line-height: 1.35;
}

.history-timeline__head p:last-child {
  margin: 0;
  color: var(--history-deep);
  line-height: 1.9;
}

.history-era {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1rem, 2vw, 1.4rem);
  padding: clamp(1.1rem, 2.4vw, 1.6rem);
  background:
    radial-gradient(circle at 96% 12%, rgba(159, 233, 246, .18), transparent 9rem),
    rgba(255, 255, 255, .78);
  border: 1px solid rgba(42, 148, 214, .14);
  border-radius: 8px;
}

.history-era--start,
.history-era--current {
  background:
    radial-gradient(circle at 94% 9%, rgba(159, 233, 246, .28), transparent 12rem),
    linear-gradient(180deg, rgba(255, 255, 255, .92), rgba(239, 251, 255, .8));
}

.history-era--middle,
.history-era--newgen,
.history-era--late {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .94), rgba(250, 254, 255, .82)),
    rgba(255, 255, 255, .9);
}

.history-era--anniversary {
  background:
    radial-gradient(circle at 86% 12%, rgba(217, 164, 65, .16), transparent 14rem),
    linear-gradient(180deg, rgba(255, 255, 255, .96), rgba(255, 252, 240, .82));
  border-color: rgba(217, 164, 65, .24);
}

.history-era__heading {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: clamp(.85rem, 2vw, 1.25rem);
}

.history-timeline__year {
  display: grid;
  place-items: center;
  min-width: clamp(5.4rem, 9vw, 7.2rem);
  min-height: clamp(5.4rem, 9vw, 7.2rem);
  color: #fff;
  font-size: clamp(1.45rem, 2.6vw, 2.15rem);
  font-weight: 700;
  line-height: 1;
  background:
    radial-gradient(circle at 34% 28%, rgba(255, 255, 255, .3), transparent 32%),
    linear-gradient(180deg, #4ca5e5 0%, #075eae 100%);
  border: 5px solid rgba(255, 255, 255, .8);
  border-radius: 50%;
  box-shadow: 0 12px 24px rgba(12, 111, 172, .16);
}

.history-era__heading h2 {
  margin: 0;
  color: #00488f;
  font-size: clamp(1.32rem, 2.4vw, 2.05rem);
  line-height: 1.45;
}

.history-event-list {
  display: grid;
  gap: clamp(1rem, 2vw, 1.35rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.history-timeline__item {
  display: grid;
  grid-template-columns: minmax(8.5rem, .22fr) minmax(0, 1fr);
  gap: clamp(.8rem, 1.6vw, 1.15rem);
  align-items: start;
}

.history-timeline__date {
  position: sticky;
  top: 148px;
  display: grid;
  gap: .48rem;
  justify-items: start;
  padding-top: .2rem;
}

.history-timeline__date time {
  color: #00488f;
  font-size: clamp(1.05rem, 1.4vw, 1.25rem);
  font-weight: 700;
  line-height: 1.2;
}

.history-timeline__label {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: .28rem .72rem;
  color: #075eae;
  font-size: .78rem;
  font-weight: 700;
  line-height: 1.2;
  background: #eefaff;
  border: 1px solid rgba(42, 148, 214, .2);
  border-radius: 999px;
}

.history-timeline__label--farewell {
  color: #705b17;
  background: #fff8df;
  border-color: rgba(217, 164, 65, .28);
}

.history-timeline__card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, .54fr);
  gap: clamp(1rem, 2vw, 1.45rem);
  align-items: center;
  min-height: 100%;
  padding: clamp(1rem, 2vw, 1.45rem);
  background: rgba(255, 255, 255, .96);
  border: 1px solid var(--history-line);
  border-radius: 8px;
  box-shadow: 0 14px 30px rgba(12, 111, 172, .08);
}

.history-timeline__card:not(:has(.history-timeline__media)) {
  grid-template-columns: 1fr;
}

.history-timeline__item--wide .history-timeline__card {
  grid-template-columns: minmax(0, .8fr) minmax(320px, .62fr);
}

.history-milestone .history-timeline__card {
  border-color: rgba(31, 126, 209, .34);
  box-shadow:
    0 18px 38px rgba(12, 111, 172, .12),
    inset 0 0 0 4px rgba(233, 250, 255, .86);
}

.history-milestone--anniversary .history-timeline__card,
.history-milestone--baby .history-timeline__card,
.history-milestone--may .history-timeline__card,
.history-milestone--kira .history-timeline__card {
  background:
    radial-gradient(circle at 95% 10%, rgba(159, 233, 246, .28), transparent 9rem),
    #fff;
}

.history-timeline__body h3 {
  margin: 0 0 .55rem;
  color: #00488f;
  font-size: clamp(1.12rem, 1.7vw, 1.42rem);
  line-height: 1.45;
}

.history-timeline__body p {
  margin: 0;
  color: var(--history-deep);
  font-size: clamp(.96rem, 1.05vw, 1.05rem);
  line-height: 1.9;
}

.history-text-nowrap {
  display: block;
  white-space: nowrap;
}

.history-timeline__media,
.history-archive-card {
  position: relative;
  overflow: hidden;
  container-type: inline-size;
  margin: 0;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .86), rgba(237, 250, 255, .76)),
    #effbff;
  border: 1px solid rgba(42, 148, 214, .18);
  border-radius: 8px;
  box-shadow: inset 0 0 0 7px rgba(255, 255, 255, .72);
}

.history-timeline__media::after,
.history-archive-card::after {
  position: absolute;
  right: clamp(.55rem, 2.4cqw, 1rem);
  bottom: clamp(.55rem, 2.4cqw, 1rem);
  z-index: 4;
  color: #fff;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(8px, 2.6cqw, 15px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .03em;
  white-space: nowrap;
  content: "(C)TOBA AQUARIUM";
  text-shadow: 0 1px 3px rgba(0, 31, 56, .72);
  pointer-events: none;
}

.history-timeline__media {
  aspect-ratio: 4 / 3;
}

.history-photo-frame::before {
  position: absolute;
  inset: .55rem;
  z-index: 1;
  content: "";
  border: 1px solid rgba(255, 255, 255, .62);
  border-radius: 6px;
  pointer-events: none;
}

.history-photo-frame figcaption {
  left: .85rem;
  bottom: .85rem;
  max-width: calc(100% - 1.7rem);
  padding: .36rem .7rem;
}

.history-timeline__media img,
.history-archive-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.history-timeline__media--contain {
  aspect-ratio: 900 / 506;
}

.history-timeline__media.history-timeline__media--contain img {
  object-fit: contain;
}

.history-name-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(.75rem, 1.4vw, 1rem);
  margin-top: clamp(1rem, 2vw, 1.35rem);
}

.history-name-grid .history-archive-card {
  aspect-ratio: 4 / 3;
  min-height: 0;
}

.history-name-grid figcaption {
  position: absolute;
  left: .65rem;
  bottom: .65rem;
  padding: .3rem .65rem;
  color: #fff;
  font-weight: 700;
  line-height: 1.2;
  background: rgba(0, 72, 143, .78);
  border-radius: 999px;
}

.history-data-card {
  align-items: stretch;
  background:
    linear-gradient(#effaff 1px, transparent 1px) 0 2.8rem / 100% 1.9rem,
    #fff;
}

.history-data-card__number,
.history-data-card__stats {
  display: grid;
  place-items: center;
  color: #00488f;
  text-align: center;
  background:
    radial-gradient(circle at 32% 24%, rgba(255, 255, 255, .9), transparent 26%),
    #e9faff;
  border: 1px solid rgba(42, 148, 214, .2);
  border-radius: 8px;
}

.history-data-card__number {
  min-height: 132px;
  margin: 0;
  font-weight: 700;
}

.history-data-card__number span,
.history-data-card__stats span {
  display: block;
  color: #00488f;
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  line-height: .95;
}

.history-data-card__stats {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .8rem;
  padding: clamp(.85rem, 1.6vw, 1.2rem);
}

.history-data-card__stats p {
  margin: 0;
  color: var(--history-deep);
  font-weight: 700;
}

.history-note {
  background:
    linear-gradient(90deg, rgba(255, 255, 255, .96), rgba(255, 253, 247, .95)),
    #fff;
  border-left: 6px solid rgba(217, 164, 65, .54);
}

.history-stamp {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  margin-bottom: .7rem;
  padding: .34rem .82rem;
  color: #705b17;
  font-size: .78rem;
  font-weight: 700;
  line-height: 1.2;
  background: #fff8df;
  border: 1px solid rgba(217, 164, 65, .28);
  border-radius: 999px;
}

.history-archive,
.history-points,
.history-faq {
  width: min(100% - 48px, 1160px);
  margin-right: auto;
  margin-left: auto;
  margin-top: clamp(1.8rem, 4vw, 3.2rem);
}

.history-archive__grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: clamp(.75rem, 1.4vw, 1rem);
  margin-top: clamp(1rem, 2vw, 1.5rem);
}

.history-archive-card {
  aspect-ratio: 4 / 3;
  min-height: 168px;
}

.history-archive-card figcaption {
  position: absolute;
  right: auto;
  bottom: .65rem;
  left: .65rem;
  max-width: calc(100% - 1.3rem);
  padding: .42rem .62rem;
  color: #fff;
  font-size: .82rem;
  font-weight: 700;
  line-height: 1.35;
  background: rgba(0, 72, 143, .78);
  border-radius: 8px;
}

.history-archive-card figcaption time {
  margin-right: .35rem;
  color: #bdf3ff;
}

.history-points__grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: clamp(.85rem, 1.6vw, 1.15rem);
  margin-top: clamp(1rem, 2vw, 1.5rem);
}

.history-point-card {
  position: relative;
  min-height: 100%;
  padding: clamp(1rem, 1.8vw, 1.28rem);
  background:
    radial-gradient(circle at 92% 12%, rgba(159, 233, 246, .24), transparent 5rem),
    #f8fdff;
  border: 1px solid var(--history-line);
  border-radius: 8px;
}

.history-point-card h3 {
  margin: 0 0 .55rem;
  color: #00488f;
  font-size: clamp(1rem, 1.35vw, 1.16rem);
  line-height: 1.45;
}

.history-point-card p {
  margin: 0;
  color: var(--history-deep);
  line-height: 1.75;
}

.page-lower--history .lower-related__grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.history-highlight-card:hover,
.history-highlight-card:focus-visible {
  border-color: rgba(31, 126, 209, .46);
  box-shadow: 0 16px 30px rgba(12, 111, 172, .13);
  transform: translateY(-2px);
}

.history-highlight-card:focus-visible,
.history-year-nav a:focus-visible {
  outline: 3px solid rgba(42, 148, 214, .42);
  outline-offset: 3px;
}

@media (max-width: 1180px) {
  .history-highlights__grid,
  .history-archive__grid,
  .history-points__grid,
  .page-lower--history .lower-related__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .history-timeline__card,
  .history-timeline__item--wide .history-timeline__card {
    grid-template-columns: minmax(0, 1fr) minmax(260px, .58fr);
  }
}

@media (max-width: 900px) {
  .history-highlights__grid,
  .history-archive__grid,
  .history-points__grid,
  .page-lower--history .lower-related__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .history-timeline::before {
    left: 1.35rem;
  }

  .history-timeline__item {
    grid-template-columns: 1fr;
  }

  .history-timeline__date {
    position: static;
    display: flex;
    align-items: center;
    gap: .6rem;
  }

  .history-timeline__card,
  .history-timeline__item--wide .history-timeline__card {
    grid-template-columns: 1fr;
  }

  .history-timeline__media {
    min-height: 260px;
  }

  .history-name-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .page-lower--history .history-archive,
  .page-lower--history .history-points,
  .page-lower--history .history-faq {
    width: min(100% - 28px, 720px);
    padding: 1rem;
  }

  .history-hero__visual {
    width: 100%;
    min-width: 0;
    min-height: 0;
    aspect-ratio: 4 / 3;
  }

  .history-highlights__grid,
  .history-archive__grid,
  .history-points__grid,
  .page-lower--history .lower-related__grid,
  .history-name-grid {
    grid-template-columns: 1fr;
  }

  .history-highlight-card {
    min-height: 118px;
  }

  .history-timeline {
    gap: 1.2rem;
  }

  .history-timeline::before {
    display: none;
  }

  .history-timeline__head,
  .history-era,
  .history-timeline__card {
    padding: 1rem;
  }

  .history-era__heading {
    grid-template-columns: 1fr;
  }

  .history-timeline__year {
    min-width: 4.6rem;
    min-height: 4.6rem;
    font-size: 1.25rem;
  }

  .history-timeline__media {
    min-height: 220px;
  }

  .history-hero__visual,
  .history-timeline__media,
  .page-lower--history .history-archive-card {
    display: block;
    aspect-ratio: 4 / 3;
    min-height: 0;
  }

  .history-hero__visual img,
  .history-timeline__media img,
  .history-archive-card img {
    width: 100%;
    height: 100%;
    aspect-ratio: auto;
    object-fit: cover;
  }

  .history-timeline__media.history-timeline__media--contain {
    aspect-ratio: 900 / 506;
  }

  .history-timeline__media.history-timeline__media--contain img {
    height: 100%;
    object-fit: contain;
  }

  .history-data-card__stats {
    grid-template-columns: 1fr;
  }

  .history-hero__visual figcaption,
  .history-photo-frame figcaption,
  .history-archive-card figcaption {
    position: absolute;
    left: .65rem;
    right: auto;
    bottom: .65rem;
    max-width: calc(100% - 1.3rem);
    margin: 0;
    color: #fff;
    background: rgba(0, 72, 143, .78);
    border: 1px solid rgba(255, 255, 255, .38);
  }

  .history-text-nowrap {
    white-space: normal;
  }

  .history-archive-card {
    min-height: 230px;
  }
}