.page-about {
  --about-gold-soft: #E7D9A8;
  --about-navy-soft: #1E3A6E;
  --about-radius-lg: 28px;
  background-color: var(--color-paper);
  color: var(--color-ink);
  overflow-x: hidden;
  scroll-padding-top: 96px;
}

/* ---------- 封面区 ---------- */
.page-about__cover {
  position: relative;
  padding: 40px 0 72px;
  background-color: var(--color-navy);
  background-image:
    radial-gradient(circle at 82% 22%, rgba(201, 165, 78, 0.18), transparent 40%),
    radial-gradient(circle at 18% 72%, rgba(255, 107, 53, 0.10), transparent 38%);
  color: var(--color-paper);
  overflow: hidden;
}

.page-about__cover-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
  z-index: 0;
}

.page-about__cover .content-shell {
  position: relative;
  z-index: 2;
}

.page-about__cover .breadcrumb {
  margin-bottom: 40px;
  color: rgba(243, 239, 230, 0.72);
}

.page-about__cover .breadcrumb__link {
  color: var(--color-gold);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

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

.page-about__cover .breadcrumb__current {
  color: var(--color-paper);
}

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

.page-about__cover-title {
  font-family: var(--font-head);
  font-size: clamp(2.2rem, 6vw, 4.6rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-white);
  margin-bottom: 24px;
  max-width: 960px;
}

.page-about__cover-sub {
  display: block;
  color: var(--color-gold);
  font-size: clamp(1.1rem, 2.6vw, 1.8rem);
  font-weight: 700;
  letter-spacing: 0;
  margin-top: 14px;
}

.page-about__cover-desc {
  max-width: 660px;
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  line-height: 1.85;
  color: rgba(243, 239, 230, 0.88);
  margin-bottom: 32px;
}

.page-about__cover-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 36px;
}

.page-about__cover-actions .button--ghost {
  background: transparent;
  border: 1px solid rgba(201, 165, 78, 0.55);
  color: var(--color-paper);
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about__cover-actions .button--ghost:hover {
  border-color: var(--color-orange);
  color: var(--color-orange);
  background: rgba(255, 107, 53, 0.08);
}

.page-about__cover-note {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(18, 40, 76, 0.55);
  border: 1px solid rgba(201, 165, 78, 0.25);
  border-radius: 999px;
  padding: 8px 18px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-gold-soft);
}

.page-about__cover-note .notice-badge {
  background: var(--color-orange);
  color: var(--color-white);
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 12px;
}

/* ---------- 01 我们是谁 ---------- */
.page-about__intro {
  padding-top: var(--space-section);
  padding-bottom: var(--space-section);
}

.page-about__intro-head {
  margin-bottom: 36px;
}

.page-about__intro-title {
  font-family: var(--font-head);
  font-size: clamp(1.7rem, 3.8vw, 2.8rem);
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.25;
  color: var(--color-navy);
  max-width: 760px;
  margin: 14px 0 0;
}

.page-about__intro-body {
  display: grid;
  gap: 28px;
}

.page-about__intro-lead p {
  font-size: clamp(1.15rem, 1.8vw, 1.4rem);
  font-weight: 700;
  line-height: 1.7;
  color: var(--color-navy);
  border-left: 3px solid var(--color-gold);
  padding-left: 20px;
  margin: 0;
}

.page-about__intro-copy p {
  line-height: 1.9;
  color: #2F2F2F;
  margin: 0 0 16px;
}

.page-about__value-list {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: grid;
  gap: 12px;
}

.page-about__value-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 18px;
  background: var(--color-white);
  border: 1px solid var(--color-gold-soft);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  line-height: 1.6;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about__value-item:hover {
  border-color: var(--color-orange);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(18, 40, 76, 0.08);
}

.page-about__value-no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-orange);
  min-width: 32px;
}

/* ---------- 02 发展历程 ---------- */
.page-about__timeline {
  background-color: var(--color-navy);
  background-image:
    linear-gradient(180deg, rgba(30, 58, 110, 0.55), transparent 60%),
    radial-gradient(circle at 88% 12%, rgba(201, 165, 78, 0.14), transparent 42%);
  color: var(--color-paper);
}

.page-about__timeline .section-eyebrow {
  color: var(--color-gold);
}

.page-about__timeline .section-title {
  color: var(--color-white);
}

.page-about__timeline .section-desc {
  color: rgba(243, 239, 230, 0.72);
}

.page-about__timeline .section-head {
  align-items: flex-end;
  gap: 20px;
}

.page-about__timeline-grid {
  display: grid;
  gap: 40px;
  margin-top: 44px;
}

.page-about__timeline-list {
  position: relative;
  padding-left: 30px;
}

.page-about__timeline-list::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--color-gold) 0%,
    rgba(201, 165, 78, 0.5) 65%,
    rgba(255, 107, 53, 0.7) 100%
  );
  border-radius: 2px;
}

.page-about__t-item {
  position: relative;
  padding-bottom: 28px;
}

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

.page-about__t-marker {
  position: absolute;
  left: -30px;
  top: 10px;
  z-index: 2;
}

.page-about__t-dot {
  display: block;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-navy);
  border: 3px solid var(--color-gold);
  box-shadow: 0 0 0 4px rgba(201, 165, 78, 0.18);
  transition: background-color 0.3s var(--ease), border-color 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about__t-item:hover .page-about__t-dot {
  background: var(--color-orange);
  border-color: var(--color-orange);
  transform: scale(1.18);
  box-shadow: 0 0 0 7px rgba(255, 107, 53, 0.24);
}

.page-about__t-pop {
  position: absolute;
  left: 30px;
  top: 50%;
  transform: translateY(-50%) translateX(-6px);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  background: var(--color-navy-soft);
  color: var(--color-gold-soft);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid rgba(201, 165, 78, 0.45);
  transition: opacity 0.28s var(--ease), transform 0.28s var(--ease);
  z-index: 3;
}

.page-about__t-item:hover .page-about__t-pop {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

.page-about__t-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(201, 165, 78, 0.22);
  border-radius: var(--radius-lg);
  padding: 18px 22px;
  transition: background-color 0.3s var(--ease), border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about__t-item:hover .page-about__t-card {
  background: rgba(30, 58, 110, 0.75);
  border-color: rgba(255, 107, 53, 0.7);
  transform: translateX(4px);
}

.page-about__t-year {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-orange);
}

.page-about__t-title {
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-white);
  margin: 6px 0 8px;
}

.page-about__t-text {
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(243, 239, 230, 0.78);
  margin: 0;
}

.page-about__timeline-media .media-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(201, 165, 78, 0.25);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

.page-about__timeline-media img,
.page-about__credentials-visual img {
  width: 100%;
  height: auto;
  display: block;
}

.page-about__media-caption {
  margin-top: 14px;
  font-size: 0.78rem;
  line-height: 1.6;
  color: rgba(243, 239, 230, 0.6);
  border-left: 2px solid var(--color-gold);
  padding-left: 12px;
}

/* ---------- 03 数字一览 ---------- */
.page-about__stats {
  padding-top: var(--space-section);
  padding-bottom: var(--space-section);
}

.page-about__stat-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 40px;
}

.page-about__stat-card {
  background: var(--color-white);
  border: 1px solid var(--color-gold-soft);
  border-radius: var(--radius-lg);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about__stat-card--lg {
  background: var(--color-navy);
  border-color: var(--color-navy-soft);
  color: var(--color-paper);
  justify-content: space-between;
}

.page-about__stat-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-orange);
  box-shadow: 0 16px 36px rgba(18, 40, 76, 0.14);
}

.page-about__stat-num {
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--color-navy);
  display: block;
  transform-origin: left center;
  transition: color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about__stat-card:hover .page-about__stat-num {
  color: var(--color-orange);
  transform: scale(1.06);
}

.page-about__stat-card--lg .page-about__stat-num {
  color: var(--color-gold);
  font-size: clamp(3.2rem, 7vw, 5.4rem);
}

.page-about__stat-card--lg:hover .page-about__stat-num {
  color: var(--color-orange);
}

.page-about__stat-suffix {
  font-size: 0.5em;
  color: var(--color-orange);
  margin-left: 2px;
}

.page-about__stat-label {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-ink);
  margin: 0;
}

.page-about__stat-card--lg .page-about__stat-label {
  color: var(--color-paper);
}

.page-about__stat-text {
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--color-slate);
  margin: 0;
}

.page-about__stat-card--lg .page-about__stat-text {
  color: rgba(243, 239, 230, 0.78);
}

/* ---------- 04 资质与认证 ---------- */
.page-about__credentials {
  background: var(--color-white);
  padding-top: var(--space-section);
  padding-bottom: var(--space-section);
}

.page-about__credentials-grid {
  display: grid;
  gap: 40px;
}

.page-about__credentials-desc {
  line-height: 1.85;
  color: #2F2F2F;
  margin-bottom: 32px;
}

.page-about__credential-list {
  display: grid;
  gap: 14px;
  margin-bottom: 28px;
}

.page-about__credential-card {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--color-paper);
  border: 1px solid var(--color-gold-soft);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about__credential-card:hover {
  border-color: var(--color-orange);
  transform: translateX(4px);
}

.page-about__credential-icon {
  flex: none;
  width: 44px;
  height: 44px;
  transition: transform 0.3s var(--ease);
}

.page-about__credential-card:hover .page-about__credential-icon {
  transform: scale(1.08);
}

.page-about__credential-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-navy);
  margin: 0 0 6px;
}

.page-about__credential-text {
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--color-slate);
  margin: 0;
}

.page-about__credentials-visual .media-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-gold-soft);
  box-shadow: var(--shadow-card);
}

.page-about__credentials-visual .page-about__media-caption {
  color: var(--color-slate);
  border-left-color: var(--color-gold);
}

/* ---------- 05 合作与生态 ---------- */
.page-about__ecosystem {
  background-color: var(--color-navy);
  background-image: radial-gradient(circle at 80% 20%, rgba(201, 165, 78, 0.15), transparent 44%);
  color: var(--color-paper);
}

.page-about__ecosystem .section-eyebrow {
  color: var(--color-gold);
}

.page-about__ecosystem .section-title {
  color: var(--color-white);
}

.page-about__eco-grid {
  display: grid;
  gap: 40px;
}

.page-about__eco-desc {
  line-height: 1.85;
  color: rgba(243, 239, 230, 0.78);
  margin-bottom: 20px;
}

.page-about__eco-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin: 32px 0 40px;
}

.page-about__eco-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about__eco-num {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--color-gold);
}

.page-about__eco-plus {
  color: var(--color-orange);
}

.page-about__eco-label {
  font-size: 0.85rem;
  color: rgba(243, 239, 230, 0.68);
}

.page-about__eco-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.page-about__eco-svg {
  width: 100%;
  max-width: 420px;
  height: auto;
}

/* ---------- CTA 区 ---------- */
.page-about__cta {
  padding-top: var(--space-section);
  padding-bottom: var(--space-section);
}

.page-about__cta-card {
  position: relative;
  background: var(--color-gold-soft);
  border: 1px solid var(--color-gold);
  border-radius: var(--radius-xl);
  padding: 40px 28px;
  overflow: hidden;
}

.page-about__cta-card::after {
  content: "";
  position: absolute;
  right: -50px;
  top: -50px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 53, 0.22), transparent 68%);
  pointer-events: none;
}

.page-about__cta-card .section-eyebrow {
  position: relative;
  z-index: 1;
  color: var(--color-orange);
}

.page-about__cta-title {
  position: relative;
  z-index: 1;
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 900;
  color: var(--color-navy);
  margin: 10px 0 12px;
}

.page-about__cta-text {
  position: relative;
  z-index: 1;
  max-width: 640px;
  line-height: 1.8;
  color: #2F2F2F;
  margin-bottom: 28px;
}

.page-about__cta-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.page-about__cta-actions .button--ghost {
  background: transparent;
  border: 1px solid rgba(18, 40, 76, 0.35);
  color: var(--color-navy);
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about__cta-actions .button--ghost:hover {
  border-color: var(--color-orange);
  color: var(--color-orange);
}

/* ---------- 响应式布局 ---------- */
@media (min-width: 640px) {
  .page-about__stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about__stat-card--lg {
    grid-column: span 2;
  }

  .page-about__intro-body {
    grid-template-columns: 1fr 1.2fr;
    gap: 36px;
  }
}

@media (min-width: 1024px) {
  .page-about__cover {
    padding: 56px 0 96px;
  }

  .page-about__cover .breadcrumb {
    margin-bottom: 56px;
  }

  .page-about__cover-desc {
    max-width: 720px;
  }

  .page-about__intro-head {
    display: grid;
    grid-template-columns: 30% 70%;
    align-items: end;
    margin-bottom: 56px;
  }

  .page-about__intro-head .section-eyebrow {
    margin-bottom: 0;
  }

  .page-about__intro-title {
    margin: 0;
  }

  .page-about__intro-body {
    grid-template-columns: 5fr 7fr;
    gap: 56px;
  }

  .page-about__intro-lead p {
    padding-left: 28px;
  }

  .page-about__timeline-grid {
    grid-template-columns: 7fr 5fr;
    gap: 56px;
    align-items: start;
  }

  .page-about__timeline-media {
    position: sticky;
    top: 120px;
  }

  .page-about__stat-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
  }

  .page-about__stat-card--lg {
    grid-column: span 2;
    grid-row: span 2;
    min-height: 280px;
  }

  .page-about__credentials-grid {
    grid-template-columns: 7fr 5fr;
    gap: 64px;
    align-items: center;
  }

  .page-about__eco-grid {
    grid-template-columns: 6fr 6fr;
    gap: 64px;
    align-items: center;
  }

  .page-about__cta-card {
    padding: 56px 48px;
  }
}

@media (hover: hover) {
  .page-about__t-pop {
    opacity: 0;
    transform: translateY(-50%) translateX(-6px);
  }

  .page-about__t-item:hover .page-about__t-pop {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
  }
}