.page-about {
  --about-card-bg: #1F1F1F;
  --about-border: #404040;
  --about-meta: #B3B3B3;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .coverage-sect {
  margin: 0;
}

.page-about .coverage-top,
.page-about .coverage-span {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-lg);
}

.page-about .coverage-top__rail,
.page-about .coverage-span__rail {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
  border-bottom: 3px solid var(--about-border);
  padding-bottom: var(--space-sm);
}

.page-about .coverage-top__num,
.page-about .coverage-span__num {
  font-family: var(--font-title);
  font-size: clamp(72px, 18vw, 120px);
  line-height: 0.85;
  color: transparent;
  -webkit-text-stroke: 2px var(--blue-electric);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.page-about .coverage-top__en,
.page-about .coverage-span__en {
  font-family: var(--font-label);
  font-size: 13px;
  letter-spacing: 0.35em;
  color: var(--gray-light);
  text-transform: uppercase;
}

.page-about .page-title {
  font-family: var(--font-title);
  font-size: clamp(36px, 6vw, 72px);
  line-height: 1;
  margin: 0 0 var(--space-md);
  color: var(--white);
  -webkit-text-stroke: 1px var(--blue-electric);
  text-shadow: 6px 6px 0 rgba(0, 229, 255, 0.22);
}

.page-about .page-lead {
  font-size: 17px;
  line-height: 1.7;
  color: var(--gray-light);
  max-width: 920px;
  margin: 0 0 var(--space-xl);
}

.page-about .number-pill {
  color: var(--yellow-bright);
  font-family: var(--font-title);
  font-size: 1.6em;
  padding: 0 0.25em;
  background: rgba(255, 107, 53, 0.2);
  border: 2px solid var(--orange-bright);
  white-space: nowrap;
}

.page-about .scale-overview {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.page-about .scale-poster {
  margin: 0;
  position: relative;
  border: 3px solid var(--about-border);
  box-shadow: var(--shadow-lg);
  background: var(--about-card-bg);
}

.page-about .scale-poster__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .scale-poster__num {
  position: absolute;
  left: 6%;
  bottom: 16%;
  font-family: var(--font-title);
  font-size: clamp(88px, 16vw, 180px);
  line-height: 0.8;
  color: var(--yellow-bright);
  text-shadow: 6px 6px 0 var(--purple-deep), 12px 12px 0 rgba(0, 229, 255, 0.5);
}

.page-about .scale-fact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-sm);
}

.page-about .scale-fact {
  background: var(--about-card-bg);
  border: 2px solid var(--about-border);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  box-shadow: var(--shadow-sm);
}

.page-about .scale-fact__num {
  font-family: var(--font-title);
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1;
}

.page-about .scale-fact__label {
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray-light);
}

.page-about .scale-fact--quarter { border-top: 5px solid var(--orange-bright); }
.page-about .scale-fact--quarter .scale-fact__num { color: var(--orange-bright); }
.page-about .scale-fact--tag1 { border-top: 5px solid var(--yellow-bright); }
.page-about .scale-fact--tag1 .scale-fact__num { color: var(--yellow-bright); }
.page-about .scale-fact--tag2 { border-top: 5px solid var(--blue-electric); }
.page-about .scale-fact--tag2 .scale-fact__num { color: var(--blue-electric); }
.page-about .scale-fact--batch { border-top: 5px solid var(--pink-rose); }
.page-about .scale-fact--batch .scale-fact__num { color: var(--pink-rose); }
.page-about .scale-fact--perday { border-top: 5px solid var(--green-fluoro); }
.page-about .scale-fact--perday .scale-fact__num { color: var(--green-fluoro); }
.page-about .scale-fact--sub { border-top: 5px solid var(--purple-light); }
.page-about .scale-fact--sub .scale-fact__num { color: var(--purple-light); }
.page-about .scale-fact--clarity { border-top: 5px solid var(--gray-light); }
.page-about .scale-fact--clarity .scale-fact__num { color: var(--gray-light); }
.page-about .scale-fact--latest { border-top: 5px solid var(--white); }
.page-about .scale-fact--latest .scale-fact__num { color: var(--white); }

.page-about .season-track {
  margin-top: var(--space-2xl);
}

.page-about .season-track__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
}

.page-about .season-track__title {
  font-family: var(--font-title);
  font-size: clamp(24px, 4vw, 34px);
  margin: 0;
  color: var(--white);
}

.page-about .season-track__link {
  font-family: var(--font-label);
  font-size: 13px;
  color: var(--blue-electric);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.page-about .season-track__link:hover {
  border-color: var(--blue-electric);
}

.page-about .season-track__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-sm);
}

.page-about .season-chip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  background: var(--about-card-bg);
  border: 2px solid var(--about-border);
  padding: var(--space-md);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s, box-shadow 0.15s;
}

.page-about .season-chip:hover {
  transform: translateY(-4px);
  box-shadow: 8px 8px 0 rgba(0, 229, 255, 0.7);
}

.page-about .season-chip__code {
  font-family: var(--font-label);
  color: var(--yellow-bright);
  font-weight: bold;
  font-size: 14px;
}

.page-about .season-chip__num {
  font-family: var(--font-title);
  font-size: 32px;
  color: var(--white);
  margin-left: auto;
}

.page-about .season-chip__unit {
  font-family: var(--font-label);
  color: var(--gray-light);
  font-size: 12px;
}

.page-about .taxonomy-lead {
  font-size: 17px;
  line-height: 1.7;
  max-width: 860px;
  color: var(--gray-light);
  margin: var(--space-lg) 0 var(--space-xl);
}

.page-about .taxonomy-tree {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.page-about .taxonomy-branch {
  background: var(--about-card-bg);
  border: 2px solid var(--about-border);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
}

.page-about .taxonomy-branch__head {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  border-bottom: 2px dashed var(--about-border);
  padding-bottom: var(--space-sm);
  margin-bottom: var(--space-md);
}

.page-about .taxonomy-branch__idx {
  font-family: var(--font-label);
  font-size: 12px;
  color: var(--gray-light);
}

.page-about .taxonomy-branch__name {
  font-family: var(--font-title);
  font-size: 28px;
  line-height: 1;
  text-transform: uppercase;
}

.page-about .taxonomy-branch__meta {
  margin-left: auto;
  font-family: var(--font-label);
  font-size: 12px;
  color: var(--gray-light);
}

.page-about .taxonomy-branch:nth-child(1) .taxonomy-branch__name { color: var(--orange-bright); }
.page-about .taxonomy-branch:nth-child(2) .taxonomy-branch__name { color: var(--yellow-bright); }
.page-about .taxonomy-branch:nth-child(3) .taxonomy-branch__name { color: var(--blue-electric); }
.page-about .taxonomy-branch:nth-child(4) .taxonomy-branch__name { color: var(--pink-rose); }
.page-about .taxonomy-branch:nth-child(5) .taxonomy-branch__name { color: var(--purple-light); }
.page-about .taxonomy-branch:nth-child(6) .taxonomy-branch__name { color: var(--gray-light); }

.page-about .taxonomy-branch__chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.page-about .taxonomy-note {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-lg);
  align-items: center;
}

.page-about .taxonomy-note__text {
  color: var(--gray-light);
  line-height: 1.7;
  margin: 0;
}

.page-about .taxonomy-note__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 3px solid var(--about-border);
  box-shadow: var(--shadow-sm);
}

.page-about .batch-intro {
  font-size: 17px;
  line-height: 1.7;
  color: var(--gray-light);
  max-width: 920px;
  margin: var(--space-lg) 0 0;
}

.page-about .batch-flow {
  list-style: none;
  margin: var(--space-xl) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-md);
}

.page-about .batch-flow__item {
  background: rgba(31, 31, 31, 0.72);
  border: 2px solid var(--about-border);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.page-about .batch-flow__step {
  font-family: var(--font-title);
  font-size: 56px;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 2px var(--yellow-bright);
  display: block;
  margin-bottom: var(--space-md);
}

.page-about .batch-flow__body h3 {
  font-family: var(--font-title);
  font-size: 22px;
  margin: 0 0 var(--space-sm);
  color: var(--white);
}

.page-about .batch-flow__body p {
  font-size: 15px;
  line-height: 1.65;
  color: var(--gray-light);
  margin: 0 0 var(--space-md);
}

.page-about .batch-flow__badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.page-about .batch-summary {
  margin-top: var(--space-xl);
  border: 3px solid var(--blue-electric);
  background: rgba(31, 31, 31, 0.8);
  padding: var(--space-lg);
  display: grid;
  gap: var(--space-md);
  box-shadow: var(--shadow-lg);
}

.page-about .batch-summary__badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.page-about .batch-summary__text {
  margin: 0;
  color: var(--gray-light);
  line-height: 1.7;
}

.page-about .version-lead {
  font-size: 17px;
  line-height: 1.7;
  color: var(--gray-light);
  max-width: 920px;
  margin: var(--space-lg) 0 var(--space-xl);
}

.page-about .version-compare {
  display: flex;
  gap: var(--space-sm);
  align-items: stretch;
  overflow-x: auto;
  padding: 0 2px var(--space-md);
  scroll-snap-type: x mandatory;
  margin-bottom: var(--space-xl);
}

.page-about .version-compare__col {
  flex: 0 0 260px;
  scroll-snap-align: start;
  background: var(--about-card-bg);
  border: 2px solid var(--about-border);
  box-shadow: var(--shadow-sm);
  padding: var(--space-lg);
}

.page-about .version-compare__col--new {
  border-color: var(--blue-electric);
}

.page-about .version-compare__arrow {
  flex: 0 0 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-title);
  font-size: 36px;
  color: var(--yellow-bright);
}

.page-about .version-compare__tag {
  font-family: var(--font-label);
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--yellow-bright);
  display: block;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px dashed var(--about-border);
}

.page-about .version-compare__col--old .version-compare__tag {
  color: var(--gray-light);
}

.page-about .version-compare__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .version-compare__list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--about-border);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .version-compare__list li:last-child {
  border-bottom: 0;
}

.page-about .version-compare__list span {
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gray-light);
}

.page-about .version-compare__list strong {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.4;
  color: var(--white);
}

.page-about .version-compare__visual {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 3px solid var(--about-border);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--space-xl);
}

.page-about .access-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.page-about .access-cell {
  background: var(--about-card-bg);
  border: 2px solid var(--about-border);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  box-shadow: var(--shadow-sm);
}

.page-about .access-cell__label {
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: 0.15em;
  color: var(--blue-electric);
  text-transform: uppercase;
}

.page-about .access-cell__value {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  color: var(--white);
}

@media (min-width: 600px) {
  .page-about .scale-fact-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .season-track__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .taxonomy-tree {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .taxonomy-note {
    grid-template-columns: 1.2fr 1fr;
  }
}

@media (min-width: 760px) {
  .page-about .batch-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 992px) {
  .page-about .coverage-top,
  .page-about .coverage-span {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: var(--space-2xl);
  }

  .page-about .coverage-top__rail,
  .page-about .coverage-span__rail {
    flex-direction: column;
    align-items: flex-start;
    border-bottom: 0;
    border-right: 3px solid var(--about-border);
    padding-right: var(--space-lg);
    padding-bottom: 0;
  }

  .page-about .scale-overview {
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--space-xl);
  }

  .page-about .taxonomy-tree {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .batch-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .version-compare {
    overflow: visible;
    gap: var(--space-md);
  }

  .page-about .version-compare__col {
    flex: 1 1 0;
  }

  .page-about .version-compare__arrow {
    flex: 0 0 64px;
  }

  .page-about .access-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}