.page-about {
  --about-accent: #FF6A00;
  --about-deep: #0A2A1C;
  --about-mid: #146B4A;
  --about-card: #0F4A35;
  --about-line: #2B7A5A;
  --about-text: #F2F7F4;
  --about-muted: #B8D4C3;
  font-family: var(--font-sans);
  color: var(--about-text);
  background: linear-gradient(170deg, var(--bg) 0%, var(--bg-deep) 70%);
  overflow-x: hidden;
}

/* 共享类在本页的间距与层级扩展 */
.page-about .section-kicker {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  color: var(--about-accent);
  margin: 0 0 0.75rem;
  text-transform: uppercase;
}

.page-about .section-head {
  max-width: var(--container);
  margin: 0 auto 3rem;
  padding: 0 var(--gutter);
}

.page-about .section-head h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 900;
  line-height: 1.2;
  margin: 0 0 1rem;
}

.page-about .lead {
  font-size: 1.125rem;
  color: var(--about-muted);
  max-width: 34em;
  line-height: 1.7;
  margin: 0;
}

.page-about .btn {
  padding: 0.875rem 1.75rem;
  border-radius: 0;
  text-decoration: none;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .btn-accent {
  background: var(--about-accent);
  color: var(--about-deep);
  border: 3px solid var(--about-deep);
  box-shadow: 6px 6px 0 rgba(255, 106, 0, 0.28);
}

.page-about .btn-accent:hover,
.page-about .btn-accent:focus {
  transform: translate(2px, 2px);
  box-shadow: 3px 3px 0 rgba(255, 106, 0, 0.28);
}

.page-about .hero-ghost {
  background: transparent;
  color: var(--about-text);
  border: 2px solid var(--about-line);
}

.page-about .hero-ghost:hover,
.page-about .hero-ghost:focus {
  border-color: var(--about-accent);
  color: var(--about-accent);
}

.page-about .breadcrumb {
  display: flex;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--about-muted);
  margin-bottom: 1.75rem;
}

.page-about .breadcrumb a {
  color: var(--about-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* 首屏：左右分屏 */
.page-about .about-hero {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  max-width: var(--container);
  margin: 0 auto;
  padding: calc(var(--gutter) * 1.2) var(--gutter) var(--gutter);
}

.page-about .hero-copy {
  padding: 2rem 0;
  position: relative;
  z-index: 2;
}

.page-about .about-hero h1 {
  font-size: clamp(2.125rem, 5vw, 3.75rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 0 1.25rem;
}

.page-about .h1-accent {
  color: var(--about-accent);
}

.page-about .hero-note {
  font-size: 1rem;
  color: var(--about-muted);
  line-height: 1.75;
  max-width: 32em;
  margin: 0 0 2rem;
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 2rem 0 2.25rem;
}

.page-about .fact-block {
  background: var(--about-card);
  border: 3px solid var(--about-line);
  box-shadow: 4px 4px 0 rgba(255, 106, 0, 0.12);
  padding: 1.25rem 0.75rem;
  text-align: center;
}

.page-about .fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--about-accent);
  line-height: 1;
  margin-bottom: 0.4rem;
}

.page-about .fact-label {
  font-size: 0.8125rem;
  color: var(--about-muted);
  letter-spacing: 0.03em;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-about .hero-visual {
  position: relative;
  margin-top: 2rem;
}

.page-about .hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  border: 4px solid var(--about-line);
  box-shadow: 10px 10px 0 rgba(255, 106, 0, 0.14);
  object-fit: cover;
}

/* 发展历程 */
.page-about .about-milestones {
  background: var(--about-deep);
  padding: calc(var(--gutter) * 1.5) 0;
  border-top: 4px solid var(--about-line);
  border-bottom: 4px solid var(--about-line);
}

.page-about .timeline-wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.page-about .timeline {
  position: relative;
  margin: 0.5rem 0 0 0.5rem;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  background: var(--about-line);
}

.page-about .timeline-item {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
  position: relative;
}

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

.page-about .timeline-marker {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--about-accent);
  color: var(--about-deep);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 3px solid var(--about-deep);
  box-shadow: 0 0 0 2px var(--about-accent);
  position: relative;
  z-index: 1;
  margin-top: 0.25rem;
}

.page-about .timeline-content {
  background: var(--about-card);
  border: 2px solid var(--about-line);
  box-shadow: 5px 5px 0 rgba(255, 106, 0, 0.08);
  padding: 1.5rem;
  flex: 1;
}

.page-about .timeline-content h3 {
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--about-text);
  margin: 0 0 0.5rem;
}

.page-about .timeline-content p {
  font-size: 0.9375rem;
  color: var(--about-muted);
  line-height: 1.7;
  margin: 0 0 0.75rem;
}

.page-about .timeline-content .tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--about-accent);
  background: rgba(255, 106, 0, 0.08);
  border: 1px solid rgba(255, 106, 0, 0.4);
  padding: 0.25rem 0.6rem;
  letter-spacing: 0.05em;
}

.page-about .milestone-visual {
  position: relative;
  align-self: center;
}

.page-about .milestone-visual img {
  display: block;
  width: 100%;
  height: auto;
  border: 4px solid var(--about-line);
  box-shadow: 8px 8px 0 rgba(255, 106, 0, 0.14);
  object-fit: cover;
}

.page-about .milestone-visual .v-note {
  position: absolute;
  right: -0.5rem;
  bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--about-muted);
  transform: rotate(90deg);
  transform-origin: right bottom;
  background: var(--about-deep);
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--about-line);
}

/* 团队实力 */
.page-about .about-team {
  padding: calc(var(--gutter) * 1.5) 0;
  background: linear-gradient(to bottom, var(--bg-deep), var(--bg), var(--bg-mid) 140%);
}

.page-about .team-grid {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about .role-card {
  background: var(--about-card);
  border: 3px solid var(--about-line);
  box-shadow: 6px 6px 0 rgba(255, 106, 0, 0.12);
  padding: 2rem 1.75rem;
  position: relative;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .role-card:hover {
  border-color: var(--about-accent);
  transform: translate(-2px, -2px);
  box-shadow: 10px 10px 0 rgba(255, 106, 0, 0.18);
}

.page-about .role-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--about-accent);
  background: rgba(255, 106, 0, 0.1);
  border: 1px solid rgba(255, 106, 0, 0.35);
  padding: 0.3rem 0.6rem;
  margin-bottom: 1.25rem;
}

.page-about .role-card h3 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--about-text);
  margin: 0 0 0.75rem;
}

.page-about .role-card p {
  font-size: 0.9375rem;
  color: var(--about-muted);
  line-height: 1.7;
  margin: 0 0 1.25rem;
}

.page-about .role-tags {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .role-tags li {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--about-muted);
  padding: 0.4rem 0 0.4rem 1.1rem;
  position: relative;
  border-top: 1px solid rgba(43, 122, 90, 0.35);
}

.page-about .role-tags li:first-child {
  border-top: none;
  padding-top: 0.625rem;
}

.page-about .role-tags li::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--about-accent);
  font-weight: 700;
}

.page-about .team-metrics {
  max-width: var(--container);
  margin: 3rem auto 0;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.page-about .metric-block {
  background: var(--about-accent);
  color: var(--about-deep);
  text-align: center;
  padding: 1.5rem 1rem;
  border: 3px solid var(--about-deep);
  box-shadow: 6px 6px 0 rgba(255, 106, 0, 0.25);
}

.page-about .metric-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1;
  margin-bottom: 0.4rem;
}

.page-about .metric-label {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.03em;
}

/* 本地服务 */
.page-about .about-local {
  max-width: var(--container);
  margin: 0 auto;
  padding: calc(var(--gutter) * 1.5) var(--gutter);
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.page-about .local-copy h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 900;
  line-height: 1.2;
  margin: 0 0 1.25rem;
}

.page-about .local-copy p {
  font-size: 1rem;
  color: var(--about-muted);
  line-height: 1.75;
  margin: 0 0 1.25rem;
  max-width: 28em;
}

.page-about .local-address {
  display: block;
  background: var(--about-card);
  border-left: 4px solid var(--about-accent);
  padding: 1.25rem 1.5rem;
  margin: 1.75rem 0;
  font-style: normal;
  line-height: 2;
}

.page-about .addr-line {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--about-text);
}

.page-about .local-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-about .local-visual img {
  display: block;
  width: 100%;
  height: auto;
  border: 4px solid var(--about-line);
  box-shadow: 10px 10px 0 rgba(255, 106, 0, 0.14);
  object-fit: cover;
}

/* data-reveal 渐进增强 */
.page-about [data-reveal] {
  opacity: 1;
  transform: none;
}

.page-about [data-reveal][data-revealed] {
  animation: aboutRise 0.5s ease both;
}

@keyframes aboutRise {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 桌面端 */
@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: 7fr 5fr;
    gap: 3rem;
    align-items: center;
    min-height: calc(100vh - var(--header-h));
  }

  .page-about .about-hero::before {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    width: 42%;
    height: 100%;
    background: var(--about-mid);
    clip-path: polygon(18% 0, 100% 0, 100% 100%, 0 100%);
    opacity: 0.6;
    pointer-events: none;
  }

  .page-about .hero-copy {
    padding: 4rem 0;
  }

  .page-about .hero-visual {
    margin-top: 0;
  }

  .page-about .hero-visual img {
    max-height: 70vh;
    object-fit: cover;
  }

  .page-about .timeline-wrap {
    grid-template-columns: 3fr 2fr;
    gap: 4rem;
    align-items: center;
  }

  .page-about .timeline {
    margin-left: 1rem;
  }

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

  .page-about .about-local {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
  }

  .page-about .local-copy {
    order: 1;
  }

  .page-about .local-visual {
    order: 2;
  }
}

@media (min-width: 1200px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .hero-facts {
    gap: 1.5rem;
  }

  .page-about .hero-copy {
    padding-right: 2rem;
  }
}