.page-about {
  background: var(--c-navy);
  color: #fff;
  overflow-x: hidden;
}

.page-about .about-breadcrumb {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 18px var(--pad) 0;
}

.page-about .about-hero {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: clamp(40px, 7vw, 72px) var(--pad) 0;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(42px, 8vw, 72px);
  line-height: 0.95;
  letter-spacing: 0.02em;
  margin: 10px 0 24px;
  max-width: 12em;
}

.page-about .about-hero .lead {
  font-size: 17px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.85);
  max-width: 56em;
  margin: 0 0 28px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 40px;
}

.page-about .about-hero .btn--ghost {
  border-color: rgba(255, 255, 255, 0.55);
  color: #fff;
}

.page-about .about-hero__scan {
  width: 100%;
  height: 12px;
  background:
    linear-gradient(90deg, var(--c-green) 0 56px, transparent 56px 60px, var(--c-green) 60px 116px, transparent 116px 120px, var(--c-green) 120px 176px, transparent 176px 100%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.35) 0 1px, transparent 1px 44px);
}

.page-about .about-hero__scan::after {
  content: "COORD / 大区网格";
  display: block;
  padding-top: 6px;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: rgba(255, 255, 255, 0.55);
}

.page-about .data-banner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--pad);
  position: relative;
}

.page-about .data-banner__map {
  display: block;
  width: 100%;
  height: auto;
  max-height: 320px;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-bottom: none;
  background: var(--c-navy);
}

.page-about .data-banner__floor {
  height: 10px;
  background: var(--c-green);
  transform: skewX(-18deg) scaleX(1.02);
  margin-bottom: 28px;
}

.page-about .data-banner__items {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about .data-banner__item {
  background: rgba(255, 255, 255, 0.06);
  border-left: 3px solid var(--c-green);
  padding: 18px 12px;
  display: grid;
  gap: 6px;
}

.page-about .data-banner__num {
  font-family: var(--font-num);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1;
  color: #fff;
}

.page-about .data-banner__label {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
}

.page-about .data-banner__coord {
  display: block;
  margin-top: 16px;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: rgba(255, 255, 255, 0.45);
  text-align: right;
}

.page-about .about-layout {
  max-width: var(--container-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
}

.page-about .about-index {
  background: var(--c-navy);
  padding: 24px 0 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.page-about .about-index__inner {
  padding: 0 var(--pad);
}

.page-about .about-index__note {
  font-family: var(--font-display);
  letter-spacing: 0.2em;
  font-size: 16px;
  color: var(--c-green);
  margin-bottom: 14px;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 10px 14px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  color: #fff;
  text-decoration: none;
  font-size: 14px;
  transition: border-color 0.2s, background 0.2s;
}

.page-about .about-index__link span {
  font-family: var(--font-num);
  color: var(--c-green);
}

.page-about .about-index__link:hover {
  border-color: var(--c-green);
  background: rgba(57, 255, 20, 0.08);
}

.page-about .about-index__live {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 16px;
}

.page-about .about-index__doc {
  border-color: rgba(255, 255, 255, 0.45);
  color: #fff;
}

.page-about .about-content {
  background: var(--c-light);
  padding: 32px var(--pad) 64px;
  color: var(--c-ink);
  position: relative;
  background-image:
    linear-gradient(rgba(10, 31, 68, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10, 31, 68, 0.04) 1px, transparent 1px);
  background-size: 28px 28px;
}

.page-about .about-chapter {
  padding: 40px 0;
  border-bottom: 1px solid var(--c-line);
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.page-about .about-chapter__index {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(64px, 10vw, 92px);
  line-height: 0.9;
  color: transparent;
  -webkit-text-stroke: 1px rgba(10, 31, 68, 0.28);
  user-select: none;
}

.page-about .about-chapter__body .chapter-index {
  display: block;
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.22em;
  color: var(--c-orange);
  margin-bottom: 8px;
}

.page-about .about-chapter__body .chapter-title {
  font-family: var(--font-display);
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.1;
  color: var(--c-ink);
  margin: 0 0 20px;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--c-orange);
  display: inline-block;
}

.page-about .about-chapter__body p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-ink);
  margin: 0 0 16px;
}

.page-about .about-chapter__note {
  background: #fff;
  border-left: 4px solid var(--c-green);
  padding: 14px 16px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-muted);
  margin-top: 20px;
}

.page-about .metric-grid {
  list-style: none;
  margin: 20px 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about .metric-grid__item {
  background: #fff;
  border: 1px solid var(--c-line);
  padding: 18px 14px;
  display: grid;
  gap: 6px;
  box-shadow: 4px 4px 0 rgba(10, 31, 68, 0.08);
}

.page-about .metric-grid__num {
  font-family: var(--font-num);
  font-size: clamp(24px, 4vw, 36px);
  line-height: 1;
  color: var(--c-navy);
}

.page-about .metric-grid__label {
  font-size: 13px;
  color: var(--c-muted);
}

.page-about .about-list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 24px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--c-ink);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 12px;
  height: 4px;
  background: var(--c-orange);
  transform: skewX(-18deg);
}

.page-about .venue-net {
  background: #fff;
  border: 1px solid var(--c-line);
  padding: 18px;
  margin-top: 22px;
  box-shadow: var(--shadow-hard);
}

.page-about .venue-net svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .venue-net text {
  font-family: var(--font-body);
  font-size: 13px;
  fill: #fff;
}

.page-about .arch-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 18px;
}

.page-about .arch-grid__figure {
  margin: 0;
  order: -1;
}

.page-about .arch-grid__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--c-line);
  box-shadow: 6px 6px 0 rgba(10, 31, 68, 0.12);
}

.page-about .arch-grid__figcaption {
  font-size: 13px;
  color: var(--c-muted);
  margin-top: 10px;
  line-height: 1.5;
}

.page-about .timeline {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-left: 2px solid var(--c-line);
  margin-left: 6px;
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 28px 26px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 6px;
  width: 14px;
  height: 14px;
  background: var(--c-navy);
  border: 3px solid var(--c-orange);
  border-radius: 50%;
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__version {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.08em;
  background: var(--c-navy);
  color: #fff;
  padding: 4px 12px;
  margin-bottom: 8px;
}

.page-about .timeline__desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-muted);
}

.page-about .timeline-figure {
  margin-top: 28px;
}

.page-about .timeline-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--c-line);
}

.page-about .compliance-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 18px;
}

.page-about .compliance-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-top: 4px solid var(--c-green);
  padding: 20px 16px;
  box-shadow: 6px 6px 0 rgba(10, 31, 68, 0.08);
}

.page-about .compliance-card__title {
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 10px;
  color: var(--c-navy);
}

.page-about .compliance-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-muted);
  margin-bottom: 6px;
}

.page-about .compliance-card__id {
  font-family: var(--font-num);
  font-size: 20px;
  color: var(--c-navy);
  letter-spacing: 0.04em;
}

.page-about .about-chapter__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-content .btn--ghost {
  border-color: var(--c-navy);
  color: var(--c-navy);
}

@media (min-width: 760px) {
  .page-about .data-banner__map {
    max-height: 400px;
  }

  .page-about .data-banner__items {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-chapter {
    grid-template-columns: 86px 1fr;
    gap: 28px;
  }

  .page-about .metric-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .compliance-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 260px minmax(0, 1fr);
    max-width: 1280px;
  }

  .page-about .about-index {
    position: relative;
    border-top: none;
    padding: 48px 0;
  }

  .page-about .about-index__inner {
    position: sticky;
    top: 32px;
    padding: 0 32px 0 40px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    align-items: stretch;
    overflow-x: visible;
    scrollbar-width: auto;
  }

  .page-about .about-index__link {
    justify-content: space-between;
    border: none;
    border-left: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 0;
    padding: 10px 4px 10px 16px;
    font-size: 15px;
  }

  .page-about .about-index__link:hover {
    border-left-color: var(--c-green);
    background: rgba(255, 255, 255, 0.04);
  }

  .page-about .about-content {
    padding: 56px 56px 72px;
  }

  .page-about .arch-grid {
    grid-template-columns: 1fr 340px;
    gap: 36px;
    align-items: start;
  }

  .page-about .arch-grid__figure {
    order: 2;
  }
}