.page-about {
  --about-title-size: clamp(2.75rem, 7vw, 4.5rem);
}

.page-about .breadcrumb {
  padding: 1.25rem 0 0;
}

/* ===== 我们是谁 ===== */
.page-about__intro {
  padding: 2.5rem 0 3rem;
}

.page-about__intro-grid {
  display: block;
}

.page-about__intro-head {
  margin-bottom: 1.75rem;
}

.page-about__intro-head h1 {
  font-family: var(--font-head);
  font-size: var(--about-title-size);
  line-height: 1.05;
  color: var(--c-primary);
  margin: 0.5rem 0 0;
}

.page-about__intro-body > p {
  color: var(--c-text-secondary);
  line-height: 1.7;
}

.page-about__intro-statement {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--c-primary);
  border-left: 4px solid var(--c-accent);
  padding-left: 1.25rem;
  margin: 0 0 1.5rem;
}

.page-about__intro-statement strong {
  color: var(--c-accent);
}

.page-about__intro-media {
  margin-top: 2rem;
}

.page-about__intro-img,
.page-about__map-img,
.page-about__team-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
}

.page-about__intro-meta {
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.page-about__meta-item {
  background: var(--c-surface);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  box-shadow: 0 8px 24px var(--c-shadow);
  border-bottom: 3px solid var(--c-secondary);
}

.page-about__meta-item span {
  display: block;
  font-size: 0.75rem;
  color: var(--c-text-secondary);
  letter-spacing: 0.06em;
}

.page-about__meta-item strong {
  font-family: var(--font-head);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--c-primary);
  line-height: 1.1;
}

/* ===== 关键数据带 ===== */
.page-about__statsband {
  background: var(--c-primary);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.page-about__statsband::before {
  content: "";
  position: absolute;
  width: 22rem;
  height: 22rem;
  border-radius: 50%;
  background: var(--c-accent);
  opacity: 0.18;
  top: -8rem;
  right: -7rem;
}

.page-about__statsband::after {
  content: "";
  position: absolute;
  width: 10rem;
  height: 10rem;
  border-radius: 50%;
  background: var(--c-secondary);
  opacity: 0.15;
  bottom: -3rem;
  left: 16%;
}

.page-about__statsband-inner {
  position: relative;
  z-index: 1;
}

.page-about__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  padding: 3rem 0;
}

.page-about__stat {
  display: flex;
  flex-direction: column;
}

.page-about__stat-num {
  font-family: var(--font-head);
  font-size: clamp(2.75rem, 9vw, 4.5rem);
  font-weight: 700;
  color: var(--c-accent);
  line-height: 1;
}

.page-about__stat-label {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  margin-top: 0.5rem;
}

/* ===== 发展里程碑 ===== */
.page-about__milestones {
  padding: 4rem 0 3rem;
}

.page-about__section-head {
  margin-bottom: 2.5rem;
}

.page-about__section-head h2 {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.1;
  margin: 0.25rem 0 0.75rem;
  color: var(--c-primary);
}

.page-about__section-head .section__lead {
  max-width: 640px;
}

.page-about__milestone-grid {
  display: block;
}

.page-about__timeline {
  position: relative;
  padding-left: 0;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--c-secondary);
  opacity: 0.45;
}

.page-about__timeline-item {
  position: relative;
  padding-left: 2.5rem;
  margin-bottom: 1.5rem;
}

.page-about__timeline-dot {
  position: absolute;
  left: 7px;
  top: 0.4rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--c-secondary);
  box-shadow: 0 0 0 4px var(--c-secondary-soft);
}

.page-about__timeline-card {
  background: var(--c-surface);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.25rem;
  box-shadow: 0 8px 24px var(--c-shadow);
}

.page-about__timeline-year {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--c-accent);
  margin-bottom: 0.25rem;
}

.page-about__timeline-card h3 {
  font-family: var(--font-head);
  font-size: 1.25rem;
  color: var(--c-primary);
  margin: 0.25rem 0 0.4rem;
}

.page-about__timeline-card p {
  font-size: 0.9rem;
  color: var(--c-text-secondary);
  margin: 0;
}

.page-about__map {
  margin-top: 2.5rem;
}

.page-about__map-caption {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--c-text-secondary);
  text-align: center;
}

/* ===== 团队与服务网络 ===== */
.page-about__team {
  background: var(--c-primary);
  color: rgba(255, 255, 255, 0.82);
  position: relative;
  overflow: hidden;
}

.page-about__team::after {
  content: "";
  position: absolute;
  bottom: -8rem;
  left: 8%;
  width: 16rem;
  height: 16rem;
  border-radius: 50%;
  background: var(--c-secondary);
  opacity: 0.12;
}

.page-about__team .page-wrap {
  position: relative;
  z-index: 1;
}

.page-about__team-grid {
  display: block;
}

.page-about__team-figure {
  margin: 0 0 2rem;
}

.page-about__team-caption {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.6);
}

.page-about__team-copy .section__label {
  color: var(--c-accent);
}

.page-about__team-copy h2 {
  color: #fff;
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.1;
  margin: 0.25rem 0 1rem;
}

.page-about__team-lead {
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.7;
}

.page-about__team-features {
  list-style: none;
  margin: 1.75rem 0 2rem;
  padding: 0;
}

.page-about__team-features li {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: 1rem;
  color: rgba(255, 255, 255, 0.85);
}

.page-about__team-features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 50%;
  background: var(--c-secondary);
}

/* ===== 资质与认证 ===== */
.page-about__certs {
  background: var(--c-bg);
  padding: 4rem 0;
}

.page-about__cert-grid {
  display: grid;
  gap: 1.5rem;
  margin-top: 2rem;
}

.page-about__cert-card {
  background: var(--c-surface);
  border-radius: var(--radius-lg);
  padding: 2rem 1.75rem;
  box-shadow: 0 12px 32px var(--c-shadow);
  border-top: 4px solid var(--c-border);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about__cert-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px var(--c-shadow);
}

.page-about__cert-icon {
  width: 72px;
  height: 72px;
  padding: 14px;
  box-sizing: border-box;
  margin-bottom: 1.5rem;
  display: block;
  border-radius: 50%;
  transition: transform 0.3s ease;
}

.page-about__cert-card:hover .page-about__cert-icon {
  transform: scale(1.08) rotate(-3deg);
}

.page-about__cert-icon--quality {
  color: var(--c-secondary);
  background: var(--c-secondary-soft);
}

.page-about__cert-icon--environment {
  color: var(--c-accent);
  background: var(--c-accent-soft);
}

.page-about__cert-icon--safety {
  color: var(--c-primary);
  background: var(--c-primary-soft);
}

.page-about__cert-card h3 {
  font-family: var(--font-head);
  font-size: 1.6rem;
  color: var(--c-primary);
  margin: 0.25rem 0 0.5rem;
}

.page-about__cert-card p {
  color: var(--c-text-secondary);
  font-size: 0.925rem;
  line-height: 1.6;
  margin: 0;
}

/* ===== 合作伙伴与荣誉 ===== */
.page-about__partners {
  background: var(--c-primary);
  color: rgba(255, 255, 255, 0.8);
  position: relative;
  overflow: hidden;
}

.page-about__partners::before {
  content: "";
  position: absolute;
  top: -10rem;
  right: -8rem;
  width: 24rem;
  height: 24rem;
  border-radius: 50%;
  background: var(--c-accent);
  opacity: 0.14;
}

.page-about__partners .page-wrap {
  position: relative;
  z-index: 1;
}

.page-about__partners-grid {
  display: block;
}

.page-about__partners-copy .section__label {
  color: var(--c-secondary);
}

.page-about__partners-copy h2 {
  color: #fff;
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.1;
  margin: 0.25rem 0 1rem;
}

.page-about__partners-copy p {
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.7;
  max-width: 640px;
}

.page-about__award {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  margin-top: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.06);
}

.page-about__award-icon {
  width: 2rem;
  height: 2rem;
  color: var(--c-accent);
  flex: 0 0 2rem;
  margin-top: 0.25rem;
}

.page-about__award strong {
  display: block;
  font-family: var(--font-head);
  font-size: 1.4rem;
  color: #fff;
}

.page-about__award p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  margin: 0.25rem 0 0;
}

.page-about__partners-actions {
  margin-top: 2.5rem;
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  padding: 2rem;
  border-left: 4px solid var(--c-secondary);
}

.page-about__partners-statement {
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.7;
  margin: 0 0 1.25rem;
}

.page-about__trust-strip {
  display: inline-block;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  color: var(--c-accent);
  background: rgba(255, 107, 53, 0.12);
  border-radius: 999px;
  padding: 0.45rem 1rem;
  margin-bottom: 1.25rem;
}

.page-about__partners-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about__partners-links .btn--ghost {
  border: 1px solid rgba(255, 255, 255, 0.55);
  color: #fff;
}

/* ===== 桌面响应 ===== */
@media (min-width: 768px) {
  .page-about__intro-meta {
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
  }

  .page-about__cert-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.75rem;
  }

  .page-about__timeline-item {
    padding-left: 2.75rem;
  }

  .page-about__timeline-dot {
    left: 8px;
  }
}

@media (min-width: 1024px) {
  .page-about__intro-grid {
    display: grid;
    grid-template-columns: 1fr 1.7fr;
    gap: 4rem;
    align-items: start;
  }

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

  .page-about__stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
  }

  .page-about__milestone-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3.5rem;
    align-items: center;
  }

  .page-about__map {
    margin-top: 0;
  }

  .page-about__timeline {
    padding-left: 0;
  }

  .page-about__timeline::before {
    left: 50%;
    transform: translateX(-50%);
    opacity: 0.5;
  }

  .page-about__timeline-item {
    width: 50%;
    padding: 0 3rem 2.75rem;
    margin-bottom: 0;
  }

  .page-about__timeline-item:nth-child(odd) {
    margin-left: 0;
    margin-right: auto;
  }

  .page-about__timeline-item:nth-child(even) {
    margin-left: auto;
    margin-right: 0;
  }

  .page-about__timeline-item:nth-child(odd) .page-about__timeline-dot {
    right: -9px;
    left: auto;
  }

  .page-about__timeline-item:nth-child(even) .page-about__timeline-dot {
    left: -9px;
    right: auto;
  }

  .page-about__timeline-item:nth-child(odd) .page-about__timeline-card {
    text-align: right;
  }

  .page-about__team-grid {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 3.5rem;
    align-items: center;
  }

  .page-about__team-figure {
    margin-bottom: 0;
  }

  .page-about__cert-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
  }

  .page-about__partners-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.9fr;
    gap: 4rem;
    align-items: center;
  }

  .page-about__partners-actions {
    margin-top: 0;
  }
}