.page-about {
  --about-pad-y: 4.5rem;
  --about-pad-y-lg: 6.5rem;
  --about-rail-width: 8rem;
  --about-ink: rgba(230, 237, 247, 0.85);
  --about-ink-strong: #ffffff;
  --about-ink-dim: rgba(230, 237, 247, 0.6);
  --about-line: rgba(230, 237, 247, 0.14);
  background: var(--hh-blue-dark);
}

.page-about .page-about__hero {
  position: relative;
  padding: 2.25rem 0 3.75rem;
  background:
    linear-gradient(135deg, rgba(10, 31, 68, 0.98) 0%, rgba(18, 51, 103, 0.96) 55%, rgba(26, 74, 138, 0.92) 100%),
    var(--hh-blue-dark);
  color: var(--hh-blue-light);
  overflow: hidden;
}

.page-about .page-about__hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(230, 237, 247, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(230, 237, 247, 0.045) 1px, transparent 1px);
  background-size: 2rem 2rem;
  pointer-events: none;
}

.page-about .page-about__hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .page-about__crumb {
  margin-bottom: 2.75rem;
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  font-size: 0.875rem;
}

.page-about .page-about__crumb .page-about__crumb-sep {
  margin: 0 0.625rem;
  color: rgba(230, 237, 247, 0.35);
}

.page-about .page-about__hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

.page-about .page-about__hero-frame {
  padding: 1.5rem;
  max-width: 42rem;
}

.page-about .page-about__hero-kicker {
  margin: 0 0 0.875rem;
  font-family: var(--hh-font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--hh-orange);
}

.page-about .page-about__hero-frame h1 {
  margin: 0 0 1.25rem;
  font-family: var(--hh-font-display);
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--about-ink-strong);
}

.page-about .page-about__hero-lead {
  margin: 0 0 2rem;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--about-ink);
}

.page-about .page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.page-about .page-about__hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 14rem;
}

.page-about .page-about__hero-chart {
  width: 100%;
  max-width: 20rem;
  height: auto;
  display: block;
}

.page-about .page-about__chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-content: start;
}

.page-about .page-about__chapter-rail {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.page-about .page-about__chapter-index {
  font-family: var(--hh-font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--hh-orange);
  letter-spacing: -0.02em;
}

.page-about .page-about__chapter-tag {
  font-family: var(--hh-font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.375rem 0.875rem;
  border: 1px solid rgba(230, 237, 247, 0.35);
  border-radius: 999px;
  color: var(--about-ink);
  white-space: nowrap;
}

.page-about .page-about__chapter-content h2 {
  margin: 0 0 1.75rem;
  font-family: var(--hh-font-display);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  line-height: 1.25;
  color: var(--about-ink-strong);
}

.page-about .page-about__narrative,
.page-about .page-about__milestones,
.page-about .page-about__ecosystem {
  padding: var(--about-pad-y) 0;
}

.page-about .page-about__narrative {
  background: var(--hh-blue-dark);
  color: var(--about-ink);
}

.page-about .page-about__narrative-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: start;
}

.page-about .page-about__narrative-copy p {
  margin: 0 0 1.25rem;
  font-size: 1rem;
  line-height: 1.85;
}

.page-about .page-about__narrative-copy a {
  color: var(--hh-orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 107, 53, 0.5);
  transition: border-color 0.25s var(--hh-ease);
}

.page-about .page-about__narrative-copy a:hover {
  border-bottom-color: var(--hh-orange);
}

.page-about .page-about__narrative-quote {
  margin: 2.25rem 0 0.75rem;
  padding: 1.25rem 1.5rem;
  border-left: 3px solid var(--hh-orange);
  background: rgba(255, 255, 255, 0.045);
  font-size: 1.125rem;
  line-height: 1.75;
  color: rgba(230, 237, 247, 0.92);
}

.page-about .page-about__quote-ref {
  display: inline-block;
  font-family: var(--hh-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--about-ink-dim);
}

.page-about .page-about__narrative-figure {
  margin: 0;
  background: rgba(10, 31, 68, 0.45);
  border: 1px solid rgba(230, 237, 247, 0.08);
}

.page-about .page-about__milestones {
  background: var(--hh-blue-medium);
  color: var(--about-ink);
}

.page-about .page-about__milestones .page-about__chapter-tag {
  color: var(--about-ink);
}

.page-about .page-about__timeline {
  margin: 0;
  padding: 0;
  list-style: none;
  position: relative;
}

.page-about .page-about__timeline::before {
  content: "";
  position: absolute;
  left: 0.375rem;
  top: 0.25rem;
  bottom: 0;
  width: 1px;
  background: rgba(230, 237, 247, 0.18);
}

.page-about .page-about__timeline-item {
  position: relative;
  padding-left: 3.25rem;
  margin-bottom: 2rem;
}

.page-about .page-about__timeline-item:last-child {
  margin-bottom: 0;
}

.page-about .page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.25rem;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: var(--hh-orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.2);
  transition: box-shadow 0.3s var(--hh-ease), transform 0.3s var(--hh-ease);
}

.page-about .page-about__timeline-item:hover::before {
  transform: scale(1.2);
  box-shadow: 0 0 0 7px rgba(255, 107, 53, 0.26);
}

.page-about .page-about__timeline-card {
  padding: 1.375rem 1.5rem;
  background: rgba(10, 31, 68, 0.38);
  border: 1px solid rgba(230, 237, 247, 0.1);
  transition: transform 0.35s var(--hh-ease), border-color 0.35s var(--hh-ease), background-color 0.35s var(--hh-ease);
}

.page-about .page-about__timeline-card:hover {
  transform: translateX(0.5rem);
  border-color: rgba(255, 107, 53, 0.55);
  background: rgba(26, 74, 138, 0.38);
}

.page-about .page-about__timeline-year {
  display: inline-block;
  margin-bottom: 0.5rem;
  font-family: var(--hh-font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--hh-orange);
}

.page-about .page-about__timeline-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.125rem;
  line-height: 1.4;
  color: var(--about-ink-strong);
}

.page-about .page-about__timeline-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: rgba(230, 237, 247, 0.78);
}

.page-about .page-about__data {
  padding: var(--about-pad-y) 0;
  background-color: var(--hh-blue-light);
  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: 2rem 2rem;
  color: var(--hh-near-black);
}

.page-about .page-about__data .page-about__chapter-content h2 {
  color: var(--hh-blue-dark);
}

.page-about .page-about__data .page-about__chapter-tag {
  color: var(--hh-blue-dark);
  border-color: rgba(10, 31, 68, 0.35);
}

.page-about .page-about__data-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.75rem;
  align-items: center;
}

.page-about .page-about__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.page-about .page-about__stat {
  padding: 1.375rem 1.125rem;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(10, 31, 68, 0.07);
  box-shadow: 0 2px 10px rgba(10, 31, 68, 0.05);
  transition: transform 0.3s var(--hh-ease), box-shadow 0.3s var(--hh-ease);
}

.page-about .page-about__stat:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(10, 31, 68, 0.12);
}

.page-about .page-about__stat-value {
  display: block;
  font-family: var(--hh-font-display);
  font-size: clamp(1.625rem, 4vw, 2.5rem);
  line-height: 1.15;
  color: var(--hh-orange);
  margin-bottom: 0.375rem;
  letter-spacing: -0.01em;
}

.page-about .page-about__stat-label {
  display: block;
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--hh-gray);
}

.page-about .page-about__data-figure {
  margin: 0;
  background: rgba(10, 31, 68, 0.06);
  border: 1px solid rgba(10, 31, 68, 0.08);
}

.page-about .page-about__ecosystem {
  background: var(--hh-blue-dark);
  color: var(--about-ink);
}

.page-about .page-about__eco-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
  margin-bottom: 2.5rem;
}

.page-about .page-about__eco-copy p {
  margin: 0 0 1.25rem;
  font-size: 1rem;
  line-height: 1.85;
}

.page-about .page-about__eco-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .page-about__eco-tags .tag {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  font-size: 0.875rem;
  line-height: 1.4;
  border: 1px solid rgba(255, 107, 53, 0.5);
  border-radius: 999px;
  color: var(--hh-orange);
  background: rgba(255, 107, 53, 0.08);
}

.page-about .page-about__eco-figure {
  margin: 0;
  background: rgba(10, 31, 68, 0.45);
  border: 1px solid rgba(230, 237, 247, 0.08);
}

.page-about .page-about__eco-footer {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: flex-start;
  padding-top: 2rem;
  border-top: 1px solid var(--about-line);
}

.page-about .page-about__eco-footer p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: rgba(230, 237, 247, 0.75);
}

.page-about .figure-panel {
  overflow: hidden;
  border-radius: 4px;
}

.page-about .figure-panel img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
}

.page-about .breadcrumb__link {
  color: rgba(230, 237, 247, 0.65);
  text-decoration: none;
  transition: color 0.2s var(--hh-ease);
}

.page-about .breadcrumb__link:hover {
  color: var(--hh-orange);
}

.page-about .breadcrumb__item {
  color: var(--about-ink-strong);
  font-weight: 600;
}

@media (min-width: 768px) {
  .page-about .page-about__hero {
    padding: 3rem 0 5.5rem;
  }

  .page-about .page-about__hero-grid {
    grid-template-columns: 1.35fr 0.65fr;
    gap: 3.5rem;
  }

  .page-about .page-about__hero-frame {
    padding: 2rem;
  }

  .page-about .page-about__hero-visual {
    min-height: auto;
    justify-content: flex-end;
  }

  .page-about .page-about__chapter {
    grid-template-columns: var(--about-rail-width) 1fr;
    gap: 2.25rem;
  }

  .page-about .page-about__chapter-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    padding-top: 0.375rem;
  }

  .page-about .page-about__chapter-index {
    font-size: 3rem;
  }

  .page-about .page-about__narrative-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3rem;
    align-items: center;
  }

  .page-about .page-about__narrative-quote {
    margin-left: 0;
  }

  .page-about .page-about__data-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 3rem;
  }

  .page-about .page-about__stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }

  .page-about .page-about__eco-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3rem;
  }

  .page-about .page-about__eco-footer {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
  }

  .page-about .page-about__eco-footer p {
    max-width: 46rem;
  }
}

@media (min-width: 1200px) {
  .page-about .page-about__narrative,
  .page-about .page-about__milestones,
  .page-about .page-about__data,
  .page-about .page-about__ecosystem {
    padding: var(--about-pad-y-lg) 0;
  }

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