.page-about {
  background: var(--white);
  color: var(--near-black);
  overflow: clip;
}

/* ===== 品牌宣言 ===== */
.page-about .about-hero {
  position: relative;
  padding: 128px 0 64px;
  background:
    radial-gradient(ellipse at 82% 12%, rgba(242, 169, 0, .16), transparent 42%),
    linear-gradient(135deg, var(--space-navy) 0%, var(--space-navy-light) 100%);
  color: var(--white);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .about-breadcrumb {
  margin-bottom: 40px;
}

.page-about .about-breadcrumb .breadcrumb-item {
  color: rgba(255, 255, 255, .6);
}

.page-about .about-breadcrumb .breadcrumb-item[aria-current="page"] {
  color: rgba(255, 255, 255, .92);
}

.page-about .about-hero-top {
  margin-bottom: 48px;
}

.page-about .about-hero .eyebrow {
  color: var(--gold);
  margin-bottom: 16px;
}

.page-about .about-hero h1 {
  max-width: 17em;
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(1.85rem, 5vw, 3.6rem);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
}

.page-about .about-slogan {
  margin: 0 0 48px;
  font-family: var(--font-heading);
  font-size: clamp(2.6rem, 9vw, 5.75rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--gold);
  max-width: 9ch;
}

.page-about .about-hero-bottom {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, .12);
}

.page-about .about-hero-desc {
  margin: 0 0 32px;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, .82);
  max-width: 54ch;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.page-about .about-hero .btn-primary {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--space-navy);
  font-weight: 700;
}

.page-about .about-hero .btn-outline {
  border-color: rgba(255, 255, 255, .55);
  color: var(--white);
  background: transparent;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 0;
}

.page-about .about-stat {
  margin: 0;
  padding: 20px 16px;
  background: rgba(255, 255, 255, .05);
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: var(--radius-sm);
  transition: background var(--transition-timing), border-color var(--transition-timing);
}

.page-about .about-stat:hover {
  background: rgba(255, 255, 255, .09);
  border-color: rgba(242, 169, 0, .35);
}

.page-about .about-stat dt {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.5vw, 2.1rem);
  font-weight: 600;
  line-height: 1.2;
  color: var(--gold);
  margin-bottom: 6px;
}

.page-about .about-stat dd {
  margin: 0;
  font-size: .875rem;
  line-height: 1.4;
  color: rgba(255, 255, 255, .68);
}

/* ===== 发展历程 ===== */
.page-about .about-history {
  background: var(--white);
  padding: 88px 0 96px;
}

.page-about .about-heading {
  margin-bottom: 56px;
}

.page-about .about-heading h2 {
  margin: 14px 0 16px;
  font-family: var(--font-heading);
  font-size: clamp(1.7rem, 4.4vw, 3rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
  max-width: 17em;
}

.page-about .about-heading-lead {
  margin: 0;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--mid-gray);
  max-width: 48ch;
}

.page-about .about-timeline {
  position: relative;
  padding-left: 32px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--space-navy-light) 0%, var(--gold) 100%);
}

.page-about .about-timeline-item {
  position: relative;
  margin-bottom: 40px;
}

.page-about .about-timeline-dot {
  position: absolute;
  left: -17px;
  top: 26px;
  width: 0;
  height: 0;
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  border-left: 10px solid var(--gold);
  opacity: .95;
  transition: transform var(--transition-timing), filter var(--transition-timing);
}

.page-about .about-timeline-item:hover .about-timeline-dot {
  transform: translateX(3px);
  filter: drop-shadow(0 0 8px rgba(242, 169, 0, .7));
}

.page-about .about-timeline-card {
  padding: 24px 24px 26px;
  background: var(--light-gray);
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: background var(--transition-timing);
}

.page-about .about-timeline-item:hover .about-timeline-card {
  background: var(--white);
}

.page-about .about-phase {
  display: inline-block;
  margin-bottom: 10px;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--space-navy-light);
  background: rgba(11, 27, 58, .06);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
}

.page-about .about-timeline-card h3 {
  margin: 0 0 12px;
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 900;
  line-height: 1.25;
}

.page-about .about-timeline-card p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.75;
  color: rgba(10, 10, 10, .72);
}

.page-about .about-growth {
  margin: 0 0 48px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-float);
}

.page-about .about-history-foot {
  margin-top: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--border-gray);
  font-size: .95rem;
  color: var(--mid-gray);
}

/* ===== 服务优势 ===== */
.page-about .about-advantages {
  background: var(--light-gray);
  padding: 88px 0 96px;
}

.page-about .about-advantage-list {
  border-top: 1px solid var(--border-gray);
}

.page-about .about-advantage-item {
  position: relative;
  padding: 44px 0;
  border-bottom: 1px solid var(--border-gray);
}

.page-about .about-advantage-num {
  position: absolute;
  top: 20px;
  right: 0;
  font-family: var(--font-heading);
  font-size: clamp(3.5rem, 9vw, 6.5rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(11, 27, 58, .16);
  pointer-events: none;
  transition: -webkit-text-stroke-color var(--transition-timing);
}

.page-about .about-advantage-item:hover .about-advantage-num {
  -webkit-text-stroke-color: rgba(242, 169, 0, .55);
}

.page-about .about-advantage-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.page-about .about-advantage-content h3 {
  margin: 0 0 12px;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 900;
  line-height: 1.25;
}

.page-about .about-advantage-content p {
  margin: 0;
  font-size: .975rem;
  line-height: 1.8;
  color: rgba(10, 10, 10, .68);
}

.page-about .about-advantage-meta {
  margin-top: 20px;
  padding-left: 16px;
  border-left: 3px solid var(--gold);
  font-size: .9rem;
  color: var(--space-navy-light);
}

/* ===== 团队与资质 ===== */
.page-about .about-team {
  position: relative;
  background-color: var(--space-navy);
  background-image:
    linear-gradient(rgba(255, 255, 255, .03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .03) 1px, transparent 1px);
  background-size: 48px 48px;
  color: rgba(255, 255, 255, .9);
  padding: 88px 0 96px;
}

.page-about .about-team .eyebrow {
  color: var(--gold);
}

.page-about .about-team h2 {
  color: var(--white);
}

.page-about .about-team .about-heading-lead {
  color: rgba(255, 255, 255, .6);
}

.page-about .about-team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

.page-about .about-team-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 32px;
}

.page-about .about-team-stat {
  padding: 20px 12px;
  text-align: center;
  background: rgba(255, 255, 255, .05);
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: var(--radius-sm);
}

.page-about .about-team-stat .data-number {
  display: block;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  color: var(--gold);
  margin-bottom: 6px;
}

.page-about .about-team-stat-label {
  font-size: .75rem;
  line-height: 1.4;
  color: rgba(255, 255, 255, .64);
}

.page-about .about-team-desc {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, .78);
  max-width: 58ch;
}

.page-about .about-map {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-hover);
}

.page-about .about-cert-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 72px;
}

.page-about .about-cert {
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 24px;
  background: rgba(255, 255, 255, .05);
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: var(--radius-md);
  transition: background var(--transition-timing), border-color var(--transition-timing);
}

.page-about .about-cert:hover {
  background: rgba(255, 255, 255, .08);
  border-color: rgba(242, 169, 0, .4);
}

.page-about .about-cert img,
.page-about .about-cert-shield {
  width: 72px;
  height: 72px;
  border-radius: 14px;
  object-fit: cover;
  flex-shrink: 0;
}

.page-about .about-cert-shield {
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(242, 169, 0, .12);
  border: 1px solid rgba(242, 169, 0, .35);
  color: var(--gold);
}

.page-about .about-cert-shield svg {
  width: 44px;
  height: 44px;
}

.page-about .about-cert-info h3 {
  margin: 0 0 4px;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--white);
}

.page-about .about-cert-info p {
  margin: 0;
  font-size: .875rem;
  color: rgba(255, 255, 255, .62);
}

/* ===== 合作伙伴与生态 ===== */
.page-about .about-partners {
  background: var(--light-gray);
  padding: 88px 0 96px;
}

.page-about .about-partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 56px;
}

.page-about .about-partner-item {
  padding: 36px 32px;
  background: var(--white);
  border-top: 3px solid transparent;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 20px rgba(10, 10, 10, .03);
  transition: border-color var(--transition-timing), box-shadow var(--transition-timing), transform var(--transition-timing);
}

.page-about .about-partner-item:hover {
  border-top-color: var(--gold);
  box-shadow: var(--shadow-float);
  transform: translateY(-3px);
}

.page-about .about-partner-num {
  display: block;
  margin-bottom: 18px;
  font-family: var(--font-mono);
  font-size: .875rem;
  color: var(--gold);
  letter-spacing: .08em;
}

.page-about .about-partner-item h3 {
  margin: 0 0 12px;
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 900;
}

.page-about .about-partner-item p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.75;
  color: rgba(10, 10, 10, .68);
}

.page-about .about-partner-cta {
  display: flex;
  flex-direction: column;
  gap: 28px;
  align-items: flex-start;
  padding: 48px 32px;
  background: var(--space-navy);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}

.page-about .about-partner-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .03) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.page-about .about-cta-text {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--white);
  position: relative;
  z-index: 1;
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  position: relative;
  z-index: 1;
}

.page-about .about-partner-cta .btn-primary {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--space-navy);
  font-weight: 700;
}

.page-about .about-partner-cta .btn-outline {
  border-color: rgba(255, 255, 255, .5);
  color: var(--white);
  background: transparent;
}

/* ===== 响应式增强 ===== */
@media (min-width: 640px) {
  .page-about .about-cert-wrap {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-partner-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 48px 48px;
  }
}

@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 160px 0 72px;
  }

  .page-about .about-hero-stats {
    gap: 20px;
  }

  .page-about .about-team-layout {
    grid-template-columns: 1fr 1.1fr;
    align-items: center;
  }
}

@media (min-width: 992px) {
  .page-about .about-hero-bottom {
    grid-template-columns: 1fr 1.1fr;
    gap: 72px;
    align-items: end;
  }

  .page-about .about-team-stats {
    gap: 16px;
  }

  .page-about .about-partner-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .about-advantage-item {
    padding: 56px 0;
  }

  .page-about .about-cert img,
  .page-about .about-cert-shield {
    width: 88px;
    height: 88px;
  }
}