.page-about {
  --about-white-glass: rgba(255, 255, 255, 0.9);
  --about-navy-glass: rgba(27, 42, 74, 0.72);
  --about-blue-tint: rgba(58, 80, 126, 0.08);
  --about-shadow-soft: 0 10px 30px rgba(27, 42, 74, 0.08);
}

.page-about [id] {
  scroll-margin-top: 120px;
}

.page-about .breadcrumb {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
  font-family: var(--font-index);
  font-size: 13px;
  color: var(--color-secondary);
}

.page-about .breadcrumb-crumb--current {
  color: var(--color-accent);
}

.page-about .breadcrumb-sep {
  color: var(--color-border);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  min-height: 620px;
  padding: 40px 32px;
  border-radius: 0 0 24px 24px;
  background: var(--color-primary);
}

.page-about .about-hero-bg {
  position: absolute;
  inset: 0;
}

.page-about .about-hero-bg-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}

.page-about .about-hero-glass {
  position: relative;
  width: min(720px, 100%);
  padding: 26px 30px;
  border: 1px solid rgba(217, 164, 65, 0.6);
  border-radius: 18px;
  background: var(--about-white-glass);
  backdrop-filter: blur(6px);
  color: var(--color-text);
  box-shadow: 0 24px 40px rgba(0, 0, 0, 0.18);
}

.page-about .about-hero-kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.page-about .about-hero .about-index {
  font-size: 60px;
  line-height: 0.9;
  color: var(--color-accent);
}

.page-about .about-hero-label {
  font-family: var(--font-index);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-secondary);
  padding-left: 14px;
  border-left: 1px solid rgba(217, 164, 65, 0.5);
}

.page-about .about-hero-eyebrow {
  margin: 0 0 8px;
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--color-secondary);
}

.page-about .about-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 34px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--color-primary);
}

.page-about .about-hero-lead {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text);
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.page-about .hero-stat {
  padding: 12px 8px;
  border-radius: 10px;
  border: 1px solid rgba(201, 191, 175, 0.7);
  background: rgba(58, 80, 126, 0.08);
  text-align: center;
}

.page-about .hero-stat strong {
  display: block;
  font-family: var(--font-index);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.page-about .hero-stat span {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: var(--color-secondary);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 40px;
  margin-top: 40px;
}

.page-about .about-side {
  position: sticky;
  top: 24px;
  align-self: start;
  max-height: calc(100vh - 48px);
  overflow-y: auto;
  padding: 8px 0 8px 16px;
  border-left: 2px solid var(--color-border);
}

.page-about .about-side-nav {
  display: flex;
  flex-direction: column;
}

.page-about .side-nav-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 10px;
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 191, 175, 0.5);
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .side-nav-link:hover {
  background: var(--about-blue-tint);
  color: var(--color-accent);
}

.page-about .side-nav-num {
  font-family: var(--font-index);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-secondary);
}

.page-about .side-nav-link:hover .side-nav-num {
  color: var(--color-accent);
}

.page-about .side-nav-text {
  font-size: 14px;
  font-weight: 600;
}

.page-about .about-content {
  min-width: 0;
}

.page-about .about-section {
  margin-top: 56px;
}

.page-about .about-section-head {
  display: flex;
  align-items: flex-end;
  gap: 16px;
  margin-bottom: 20px;
}

.page-about .section-index {
  font-family: var(--font-index);
  font-size: 72px;
  line-height: 0.8;
  font-weight: 700;
  color: var(--color-accent);
}

.page-about .about-section-head h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 30px;
  font-weight: 900;
  color: var(--color-text);
}

.page-about .section-kicker {
  margin: 0 0 6px;
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--color-secondary);
}

.page-about .about-section-intro {
  margin: 0 0 24px;
  max-width: 640px;
  font-size: 15px;
  color: var(--color-text);
}

.page-about .about-timeline {
  position: relative;
  margin-top: 16px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 12px;
  bottom: 12px;
  left: 162px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-gold) 0%, var(--color-border) 100%);
}

.page-about .timeline-row {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 24px;
  position: relative;
  margin-bottom: 20px;
}

.page-about .timeline-row:last-child {
  margin-bottom: 0;
}

.page-about .timeline-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  padding-top: 8px;
}

.page-about .timeline-year {
  font-family: var(--font-index);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
}

.page-about .timeline-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-gold);
  border: 3px solid var(--color-bg);
  box-sizing: border-box;
  box-shadow: 0 0 0 2px var(--color-gold);
  transition: background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .timeline-row:hover .timeline-dot {
  background: var(--color-accent);
  transform: scale(1.2);
}

.page-about .timeline-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-gold);
  border-radius: 14px;
  padding: 20px 22px;
  transition: box-shadow 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .timeline-row:hover .timeline-card {
  box-shadow: var(--about-shadow-soft);
}

.page-about .timeline-tag {
  display: inline-block;
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 8px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.page-about .timeline-card h3 {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 900;
  color: var(--color-text);
}

.page-about .timeline-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
}

.page-about .about-section--data {
  background: rgba(233, 237, 244, 0.56);
  border-radius: 20px;
  padding: 28px 24px;
}

.page-about .about-system-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 28px;
}

.page-about .system-card {
  display: flex;
  gap: 16px;
  padding: 20px;
  border-radius: 14px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  transition: background 0.2s var(--ease);
}

.page-about .system-card:hover {
  background: var(--about-blue-tint);
}

.page-about .system-card-idx {
  font-family: var(--font-index);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-accent);
}

.page-about .system-card-body h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 900;
  color: var(--color-text);
}

.page-about .system-card-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
}

.page-about .about-data-figure {
  margin: 0;
  border-radius: 16px;
  overflow: hidden;
  background: var(--color-primary);
}

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

.page-about .about-data-figure figcaption {
  padding: 10px 14px;
  font-family: var(--font-index);
  font-size: 12px;
  color: var(--color-on-dark);
  background: var(--color-primary);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  align-items: start;
}

.page-about .about-team-figure {
  margin: 0;
  border-radius: 16px;
  overflow: hidden;
  background: var(--color-primary);
}

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

.page-about .about-team-figure figcaption {
  padding: 10px 14px;
  font-family: var(--font-index);
  font-size: 12px;
  color: var(--color-on-dark);
  background: var(--color-primary);
}

.page-about .about-team-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .team-card {
  display: flex;
  gap: 16px;
  padding: 20px;
  border-radius: 12px;
  background: var(--color-white);
  border-left: 4px solid var(--color-accent);
  transition: background 0.2s var(--ease);
}

.page-about .team-card:hover {
  background: var(--about-blue-tint);
}

.page-about .team-card-num {
  font-family: var(--font-index);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-gold);
}

.page-about .team-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 900;
  color: var(--color-text);
}

.page-about .team-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
}

.page-about .about-cert-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.page-about .cert-card {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 24px;
  border-radius: 14px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .cert-card:hover {
  border-color: var(--color-gold);
  box-shadow: var(--about-shadow-soft);
}

.page-about .cert-icon {
  flex: 0 0 auto;
  color: var(--color-gold);
  transition: color 0.2s var(--ease), filter 0.2s var(--ease);
}

.page-about .cert-card:hover .cert-icon {
  color: var(--color-accent);
  filter: drop-shadow(0 2px 6px rgba(217, 164, 65, 0.45));
}

.page-about .cert-card-body h3 {
  margin: 0 0 6px;
  font-size: 20px;
  font-weight: 900;
  color: var(--color-primary);
}

.page-about .cert-card-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-secondary);
}

.page-about .about-coop-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.page-about .coop-stat {
  padding: 22px 18px;
  border-radius: 14px;
  background: var(--color-primary);
  border-bottom: 4px solid var(--color-gold);
  color: var(--color-white);
  text-align: center;
}

.page-about .coop-stat strong {
  display: block;
  font-family: var(--font-index);
  font-size: 30px;
  font-weight: 700;
  color: var(--color-gold);
}

.page-about .coop-stat span {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--color-on-dark);
}

.page-about .about-coop-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 24px;
}

.page-about .coop-card {
  padding: 24px;
  border-radius: 14px;
  background: var(--color-primary);
  border-bottom: 4px solid var(--color-gold);
  color: var(--color-white);
}

.page-about .coop-card--yunnan {
  border-bottom-color: var(--color-accent);
}

.page-about .coop-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 900;
  color: var(--color-white);
}

.page-about .coop-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-on-dark);
}

.page-about .about-coop-contact {
  padding: 16px 20px;
  border-left: 4px solid var(--color-gold);
  background: rgba(217, 164, 65, 0.12);
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 32px;
}

.page-about .about-coop-contact p {
  margin: 0;
  line-height: 1.7;
}

.page-about .about-coop-contact a {
  color: var(--color-primary);
  font-weight: 700;
  text-underline-offset: 4px;
}

.page-about .about-coop-contact a:hover {
  color: var(--color-accent);
}

.page-about .about-internal-links {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 2px solid var(--color-border);
}

.page-about .internal-links-title {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--color-secondary);
}

.page-about .internal-links-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .internal-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 16px;
  border-radius: 10px;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s var(--ease);
}

.page-about .internal-link:hover {
  background: var(--color-accent);
}

.page-about .internal-link-idx {
  font-family: var(--font-index);
  font-size: 12px;
  font-weight: 700;
  color: var(--color-gold);
}

@media (max-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .page-about .about-side {
    position: static;
    max-height: none;
    padding: 0;
    border-left: 0;
    margin-bottom: 8px;
  }

  .page-about .about-side-nav {
    flex-direction: row;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: thin;
  }

  .page-about .side-nav-link {
    flex: 0 0 auto;
    white-space: nowrap;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: var(--color-white);
    padding: 8px 14px;
  }

  .page-about .about-team-grid {
    grid-template-columns: 1fr;
  }

  .page-about .about-team-figure {
    max-width: 720px;
  }

  .page-about .about-coop-grid {
    grid-template-columns: 1fr;
  }

  .page-about .about-cert-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 820px) {
  .page-about .breadcrumb {
    font-size: 12px;
  }

  .page-about .about-hero {
    min-height: 0;
    padding: 24px 16px;
    border-radius: 0 0 16px 16px;
  }

  .page-about .about-hero-glass {
    padding: 22px 18px;
    border-radius: 14px;
  }

  .page-about .about-hero h1 {
    font-size: 26px;
  }

  .page-about .about-hero .about-index {
    font-size: 48px;
  }

  .page-about .about-hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-section-head {
    gap: 12px;
  }

  .page-about .section-index {
    font-size: 52px;
  }

  .page-about .about-section-head h2 {
    font-size: 24px;
  }

  .page-about .about-timeline::before {
    display: none;
  }

  .page-about .timeline-row {
    grid-template-columns: 1fr;
    gap: 8px;
    margin-bottom: 16px;
  }

  .page-about .timeline-meta {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 10px;
    padding-top: 0;
  }

  .page-about .timeline-dot {
    margin: 0;
  }

  .page-about .timeline-year {
    font-size: 15px;
  }

  .page-about .about-section--data {
    padding: 20px 14px;
  }

  .page-about .about-system-grid {
    grid-template-columns: 1fr;
  }

  .page-about .team-card {
    flex-direction: column;
    gap: 10px;
  }

  .page-about .about-coop-stats {
    grid-template-columns: 1fr;
  }

  .page-about .coop-stat {
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .page-about .coop-stat strong {
    font-size: 26px;
  }

  .page-about .coop-stat span {
    margin-top: 0;
  }
}