.page-about {
  --about-rail: 300px;
  display: block;
}

/* ===== Hero 首屏：左右分屏品牌叙事 ===== */
.page-about .about-hero {
  background:
    linear-gradient(135deg, rgba(13,79,60,0.32) 0%, rgba(13,79,60,0.08) 38%, transparent 60%),
    var(--black);
  border-top: 1px solid var(--line-gray);
  border-bottom: 1px solid var(--line-gray);
  overflow: hidden;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacer-4);
  padding: var(--spacer-5) 0;
}

.page-about .about-hero-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--spacer-2);
  position: relative;
}

.page-about .hero-emblem {
  width: 104px;
  height: auto;
}

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

.page-about .hero-brand-note {
  color: var(--gray);
  font-size: 0.875rem;
  margin: 0;
  border-left: 2px solid var(--deep-green);
  padding-left: calc(var(--spacer-1) + 4px);
}

.page-about .hero-vertical {
  display: none;
}

.page-about .about-hero-content h1 {
  font-family: var(--font-title);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.8rem, 5vw, 3.6rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 0 0 var(--spacer-3);
  color: var(--white);
}

.page-about .hero-title-accent {
  color: var(--bright-gold);
}

.page-about .about-hero-lead {
  color: var(--gray);
  font-size: 1rem;
  line-height: 1.8;
  max-width: 680px;
  margin: 0 0 var(--spacer-4);
  border-left: 2px solid var(--gold);
  padding-left: var(--spacer-3);
}

.page-about .hero-stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  max-width: 520px;
}

.page-about .hero-stat {
  background: var(--charcoal);
  border: 1px solid var(--line-gray);
  border-top: 2px solid var(--deep-green);
  padding: var(--spacer-2) var(--spacer-1);
  transition: border-color var(--transition), background var(--transition);
}

.page-about .hero-stat:hover {
  border-color: var(--gold);
  background: #202020;
}

.page-about .hero-stat .data-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--bright-gold);
  line-height: 1.2;
}

.page-about .hero-stat-label {
  display: block;
  color: var(--gray);
  font-size: 0.75rem;
  margin-top: 4px;
}

/* ===== 通用章节头 ===== */
.page-about .about-section-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--spacer-1);
  margin-bottom: var(--spacer-4);
}

.page-about .about-section-head--center {
  align-items: center;
  text-align: center;
}

.page-about .section-index {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--gold);
  background: var(--charcoal);
  border: 1px solid var(--line-gray);
  padding: 0.25rem 0.75rem;
}

.page-about .about-section-head h2 {
  font-family: var(--font-title);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  line-height: 1.2;
  margin: 0;
  color: var(--white);
  letter-spacing: -0.01em;
}

.page-about .section-rule {
  width: 72px;
  height: 3px;
  background: linear-gradient(90deg, var(--gold) 0%, rgba(212,175,55,0.08) 100%);
}

.page-about .section-rule--center {
  margin-left: auto;
  margin-right: auto;
}

.page-about .section-sub {
  color: var(--gray);
  font-size: 0.9375rem;
  max-width: 640px;
  margin: var(--spacer-1) auto 0;
  line-height: 1.7;
}

/* ===== 品牌起源 ===== */
.page-about .about-origin {
  padding: var(--spacer-6) 0;
  background: linear-gradient(180deg, var(--black) 0%, var(--charcoal) 100%);
  border-bottom: 1px solid var(--line-gray);
}

.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacer-4);
}

.page-about .about-origin-content p {
  color: var(--white);
  margin-bottom: var(--spacer-3);
  max-width: 840px;
  line-height: 1.8;
}

.page-about .about-origin-content strong {
  color: var(--bright-gold);
  font-weight: 600;
}

.page-about .origin-year-line {
  font-family: var(--font-title);
  font-style: italic;
  font-size: 1.25rem;
  color: var(--bright-gold);
}

.page-about .origin-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacer-2);
  margin-top: var(--spacer-4);
  padding-top: var(--spacer-4);
  border-top: 1px solid var(--line-gray);
}

.page-about .origin-fact {
  display: flex;
  flex-direction: column;
}

.page-about .fact-num {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--gold);
  line-height: 1.2;
}

.page-about .fact-label {
  font-size: 0.8125rem;
  color: var(--gray);
  margin-top: 4px;
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  padding: var(--spacer-6) 0;
  background: var(--black);
  border-bottom: 1px solid var(--line-gray);
}

.page-about .about-timeline {
  position: relative;
}

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

.page-about .timeline-grid {
  display: flex;
  flex-direction: column;
}

.page-about .timeline-item {
  position: relative;
  padding-left: 28px;
  padding-bottom: var(--spacer-4);
}

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

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  bottom: -8px;
  width: 1px;
  background: var(--line-gray);
}

.page-about .timeline-item:last-child::before {
  bottom: 12px;
}

.page-about .timeline-head {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: var(--spacer-2);
}

.page-about .timeline-dot {
  position: absolute;
  left: -33px;
  top: 2px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--gold);
  border: 2px solid var(--black);
  box-shadow: 0 0 0 1px var(--gold);
  transition: background var(--transition), box-shadow var(--transition);
}

.page-about .timeline-item:nth-child(2) .timeline-dot {
  background: var(--bright-gold);
}

.page-about .timeline-item:nth-child(3) .timeline-dot {
  background: var(--bright-green);
}

.page-about .timeline-item:nth-child(4) .timeline-dot {
  background: var(--bright-gold);
}

.page-about .timeline-dot:hover {
  background: var(--bright-gold);
  box-shadow: 0 0 0 6px rgba(212, 175, 55, 0.12);
}

.page-about .timeline-year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  color: var(--bright-gold);
  line-height: 1.4;
}

.page-about .timeline-card {
  background: var(--charcoal);
  border: 1px solid var(--line-gray);
  padding: var(--spacer-3);
  transition: border-color var(--transition), background var(--transition);
}

.page-about .timeline-card:hover {
  border-color: var(--bright-gold);
  background: #202020;
}

.page-about .timeline-card .tag {
  display: inline-block;
  margin-bottom: var(--spacer-1);
}

.page-about .timeline-card h3 {
  font-family: var(--font-title);
  font-style: italic;
  font-weight: 900;
  font-size: 1.15rem;
  margin: 0 0 var(--spacer-1);
  color: var(--white);
}

.page-about .timeline-card p {
  color: var(--gray);
  font-size: 0.9rem;
  line-height: 1.7;
  margin: 0;
}

/* ===== 数据服务网络 ===== */
.page-about .about-network {
  padding: var(--spacer-6) 0;
  background: var(--charcoal);
  border-bottom: 1px solid var(--line-gray);
}

.page-about .about-network-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacer-5);
}

.page-about .network-intro {
  color: var(--gray);
  margin: 0 0 var(--spacer-4);
  max-width: 700px;
  line-height: 1.8;
}

.page-about .network-list {
  border-top: 1px solid var(--line-gray);
  display: flex;
  flex-direction: column;
}

.page-about .network-item {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  gap: var(--spacer-2);
  align-items: start;
  padding: var(--spacer-3) 0;
  border-bottom: 1px solid var(--line-gray);
  transition: background var(--transition), padding-left var(--transition);
}

.page-about .network-item:hover {
  background: rgba(13, 79, 60, 0.2);
  padding-left: 8px;
}

.page-about .network-num {
  font-family: var(--font-mono);
  color: var(--gold);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.page-about .network-copy h3 {
  font-family: var(--font-title);
  font-style: italic;
  font-size: 1rem;
  font-weight: 900;
  margin: 0 0 4px;
  color: var(--white);
}

.page-about .network-copy p {
  color: var(--gray);
  font-size: 0.9rem;
  line-height: 1.7;
  margin: 0;
}

.page-about .network-rate {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--bright-green);
  border: 1px solid rgba(30, 122, 90, 0.5);
  padding: 3px 10px;
  white-space: nowrap;
  margin-top: 2px;
}

.page-about .about-network-aside {
  display: flex;
  flex-direction: column;
  gap: var(--spacer-4);
}

.page-about .about-img-frame {
  position: relative;
  overflow: hidden;
  background: var(--black);
  border: 1px solid var(--line-gray);
}

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

.page-about .about-img-frame--data {
  aspect-ratio: 10 / 7;
}

.page-about .about-fig-label {
  display: block;
  padding: 8px 12px;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--gray);
  background: var(--charcoal);
  border-top: 1px solid var(--line-gray);
}

.page-about .network-trust {
  border: 1px solid var(--line-gray);
  border-left: 3px solid var(--gold);
  background: var(--black);
  padding: var(--spacer-2) var(--spacer-3);
}

.page-about .trust-row {
  display: flex;
  align-items: baseline;
  gap: var(--spacer-2);
  padding: 10px 0;
  border-bottom: 1px solid var(--line-gray);
}

.page-about .trust-row:last-child {
  border-bottom: none;
}

.page-about .trust-num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--bright-gold);
  font-size: 1.05rem;
  min-width: 76px;
}

.page-about .trust-row span:last-child {
  color: var(--gray);
  font-size: 0.8125rem;
}

/* ===== 团队与文化 ===== */
.page-about .about-team {
  padding: var(--spacer-6) 0;
  background: var(--black);
  border-bottom: 1px solid var(--line-gray);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacer-5);
}

.page-about .about-team-visual {
  display: flex;
  flex-direction: column;
  gap: var(--spacer-3);
}

.page-about .about-img-frame--team {
  aspect-ratio: 3 / 2;
}

.page-about .team-motto {
  border: 1px solid var(--line-gray);
  border-left: 3px solid var(--deep-green);
  background: var(--charcoal);
  padding: var(--spacer-2) var(--spacer-3);
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .motto-quote {
  font-family: var(--font-title);
  font-size: 2rem;
  color: var(--gold);
  line-height: 1;
}

.page-about .team-motto p {
  color: var(--white);
  font-style: italic;
  font-family: var(--font-title);
  margin: 0;
}

.page-about .team-lead {
  color: var(--white);
  font-size: 1.05rem;
  line-height: 1.8;
  border-left: 2px solid var(--gold);
  padding-left: var(--spacer-3);
  margin: 0 0 var(--spacer-4);
}

.page-about .team-roster {
  list-style: none;
  margin: 0 0 var(--spacer-3);
  padding: 0;
  border-top: 1px solid var(--line-gray);
}

.page-about .team-role {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 12px;
  padding: var(--spacer-2) 0;
  border-bottom: 1px solid var(--line-gray);
  transition: background var(--transition);
}

.page-about .team-role:hover {
  background: rgba(13, 79, 60, 0.14);
}

.page-about .role-name {
  font-family: var(--font-title);
  font-style: italic;
  font-weight: 900;
  color: var(--white);
  font-size: 1rem;
}

.page-about .role-count {
  grid-row: 1 / 3;
  grid-column: 2;
  font-size: 1.5rem;
  color: var(--gold);
  align-self: center;
}

.page-about .role-count.data-num {
  font-family: var(--font-mono);
}

.page-about .role-desc {
  color: var(--gray);
  font-size: 0.875rem;
  line-height: 1.6;
  grid-column: 1;
}

.page-about .team-culture {
  color: var(--gray);
  font-size: 0.9rem;
  line-height: 1.8;
  border-top: 1px solid var(--line-gray);
  padding-top: var(--spacer-3);
  margin: 0;
}

/* ===== 资质与合作 ===== */
.page-about .about-partners {
  padding: var(--spacer-6) 0;
  background: var(--charcoal);
  border-bottom: 1px solid var(--line-gray);
}

.page-about .partner-summary {
  max-width: 820px;
  margin: 0 auto var(--spacer-4);
  text-align: center;
  color: var(--gray);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.page-about .partner-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacer-3);
  margin-top: var(--spacer-4);
}

.page-about .partner-card {
  background: var(--black);
  border: 1px solid var(--line-gray);
  border-top: 3px solid var(--deep-green);
  padding: var(--spacer-3);
  transition: border-color var(--transition), transform var(--transition);
}

.page-about .partner-card:hover {
  border-color: var(--gold);
  transform: translateY(-4px);
}

.page-about .partner-num {
  font-family: var(--font-mono);
  color: var(--gold);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

.page-about .partner-card h3 {
  font-family: var(--font-title);
  font-style: italic;
  font-weight: 900;
  font-size: 1.05rem;
  margin: 8px 0 6px;
  color: var(--white);
}

.page-about .partner-card p {
  color: var(--gray);
  font-size: 0.875rem;
  line-height: 1.7;
  margin: 0;
}

/* ===== CTA 区块 ===== */
.page-about .about-cta {
  padding: var(--spacer-5) 0;
  background: var(--deep-green);
  border-top: 3px solid var(--gold);
}

.page-about .about-cta-inner {
  display: flex;
  flex-direction: column;
  gap: var(--spacer-3);
  align-items: flex-start;
}

.page-about .about-cta-copy .text-kicker.text-gold {
  color: var(--bright-gold);
}

.page-about .about-cta h2 {
  font-family: var(--font-title);
  font-style: italic;
  font-weight: 900;
  font-size: 1.6rem;
  margin: 8px 0 0;
  color: var(--white);
}

.page-about .about-cta p {
  color: rgba(240, 240, 240, 0.75);
  font-size: 0.9375rem;
  margin: 6px 0 0;
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacer-2);
}

.page-about .about-cta .btn-primary {
  background: var(--gold);
  color: var(--black);
  border: 1px solid var(--gold);
}

.page-about .about-cta .btn-primary:hover {
  background: var(--bright-gold);
  border-color: var(--bright-gold);
}

.page-about .about-cta .btn-outline {
  border-color: rgba(240, 240, 240, 0.5);
  color: var(--white);
}

.page-about .about-cta .btn-outline:hover {
  border-color: var(--bright-gold);
  color: var(--bright-gold);
}

/* ===== 底部氛围图 ===== */
.page-about .about-atmosphere {
  padding: var(--spacer-5) 0 var(--spacer-6);
  background: var(--black);
}

.page-about .about-img-frame--wide {
  aspect-ratio: 16 / 7;
  border: 1px solid var(--line-gray);
}

/* ===== 桌面端增强 ===== */
@media (min-width: 768px) {
  .page-about .hero-stat .data-num {
    font-size: 1.9rem;
  }

  .page-about .hero-stat-label {
    font-size: 0.8125rem;
  }

  .page-about .hero-stat {
    padding: var(--spacer-2);
  }

  .page-about .origin-facts {
    gap: var(--spacer-3);
  }

  .page-about .partner-cards {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacer-4);
  }

  .page-about .about-cta-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .about-img-frame--wide {
    aspect-ratio: 8 / 3;
  }

  .page-about .about-img-frame--wide img {
    min-height: 180px;
  }
}

@media (min-width: 992px) {
  .page-about .about-hero-grid {
    grid-template-columns: var(--about-rail) 1fr;
    gap: var(--spacer-6);
    align-items: center;
    min-height: 520px;
    padding: var(--spacer-6) 0;
  }

  .page-about .about-hero-brand {
    border-right: 1px solid var(--line-gray);
    padding-right: var(--spacer-5);
    min-height: 360px;
    justify-content: center;
  }

  .page-about .hero-vertical {
    display: block;
    position: absolute;
    right: var(--spacer-3);
    bottom: 0;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.3em;
    color: var(--gray);
  }

  .page-about .about-hero-content {
    padding-top: var(--spacer-2);
    padding-bottom: var(--spacer-2);
  }

  .page-about .about-origin-grid {
    grid-template-columns: 280px 1fr;
    gap: var(--spacer-6);
  }

  .page-about .about-origin .about-section-head {
    position: sticky;
    top: 100px;
    align-self: start;
  }

  /* 水平时间轴 */
  .page-about .timeline-track {
    display: block;
    position: absolute;
    top: 16px;
    left: 3%;
    width: 94%;
    height: 60px;
    overflow: visible;
    pointer-events: none;
  }

  .page-about .timeline-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacer-4);
  }

  .page-about .timeline-item {
    padding-left: 0;
    padding-bottom: 0;
  }

  .page-about .timeline-item::before {
    content: none;
  }

  .page-about .timeline-item:nth-child(even) {
    transform: translateY(30px);
  }

  .page-about .timeline-item:nth-child(odd) {
    transform: translateY(0);
  }

  .page-about .timeline-head {
    flex-direction: column;
    align-items: center;
    gap: 6px;
    margin-bottom: var(--spacer-3);
    position: relative;
    z-index: 1;
  }

  .page-about .timeline-dot {
    position: static;
    width: 22px;
    height: 22px;
    box-shadow: 0 0 0 1px var(--gold), 0 0 0 6px var(--black);
  }

  .page-about .timeline-item:nth-child(2) .timeline-dot {
    box-shadow: 0 0 0 1px var(--bright-gold), 0 0 0 6px var(--black);
  }

  .page-about .timeline-item:nth-child(3) .timeline-dot {
    box-shadow: 0 0 0 1px var(--bright-green), 0 0 0 6px var(--black);
  }

  .page-about .timeline-item:nth-child(4) .timeline-dot {
    box-shadow: 0 0 0 1px var(--bright-gold), 0 0 0 6px var(--black);
  }

  .page-about .timeline-year {
    font-size: 1.1rem;
  }

  .page-about .about-network-grid {
    grid-template-columns: 1.4fr 1fr;
    gap: var(--spacer-6);
  }

  .page-about .about-team-grid {
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacer-6);
    align-items: start;
  }

  .page-about .about-team-visual {
    position: sticky;
    top: 100px;
  }

  .page-about .about-network .about-section-head,
  .page-about .about-team .about-section-head {
    position: static;
  }

  .page-about .network-item {
    grid-template-columns: 48px 1fr auto;
    gap: var(--spacer-2);
    padding: var(--spacer-3) 0;
  }
}