.page-about {
  background: var(--color-primary);
  color: var(--color-text);
}

/* 页面头部 */
.page-about .page-head {
  padding: clamp(68px, 10vw, 128px) 0 clamp(32px, 5vw, 56px);
  background:
    radial-gradient(circle at 82% 18%, rgba(0, 194, 168, 0.14), transparent 30%),
    radial-gradient(circle at 12% 80%, rgba(255, 107, 53, 0.08), transparent 28%),
    var(--color-primary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.page-about .breadcrumb {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}
.page-about .breadcrumb a {
  color: var(--color-teal);
  text-decoration: none;
  transition: color 0.2s ease;
}
.page-about .breadcrumb a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}
.page-about .breadcrumb-sep {
  margin: 0 8px;
  color: var(--color-text-secondary);
  opacity: 0.6;
}
.page-about .page-title {
  margin-top: 16px;
  font-family: var(--font-heading);
  font-size: clamp(2.1rem, 4.5vw, 3.4rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--color-white);
}
.page-about .page-desc {
  margin-top: 18px;
  max-width: 660px;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text-secondary);
}

/* 章节头部通用（本页作用域） */
.page-about .section-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin-bottom: 28px;
}
.page-about .section-index {
  font-family: var(--font-number);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  transition: color 0.3s ease;
}
.page-about .section-index.is-in-view {
  color: var(--color-teal);
}
.page-about .section-title {
  margin-top: 8px;
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-white);
}
.page-about .section-desc {
  margin-top: 12px;
  max-width: 480px;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
}

/* 品牌故事 */
.page-about .story-section {
  padding: clamp(48px, 7vw, 88px) 0;
  background: var(--color-primary);
}
.page-about .story-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}
.page-about .story-copy .section-head {
  margin-bottom: 8px;
}
.page-about .story-lead {
  margin: 16px 0 20px;
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.45;
  color: var(--color-white);
}
.page-about .story-text {
  margin-bottom: 16px;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text-secondary);
}
.page-about .story-text strong {
  color: var(--color-teal);
  font-weight: 600;
}
.page-about .story-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.page-about .story-visual {
  position: relative;
}
.page-about .story-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 520px;
  margin: 0 auto;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* 发展里程碑 */
.page-about .milestone-section {
  position: relative;
  overflow: hidden;
  background: var(--color-deep);
  padding: clamp(48px, 7vw, 88px) 0;
}
.page-about .milestone-bg {
  position: absolute;
  top: 0;
  right: 0;
  width: 720px;
  height: 480px;
  opacity: 0.6;
  pointer-events: none;
}
.page-about .milestone-section .container {
  position: relative;
  z-index: 1;
}
.page-about .timeline {
  position: relative;
  margin-top: 40px;
  padding-left: 32px;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent), rgba(255, 255, 255, 0.15) 40%, var(--color-teal));
}
.page-about .timeline-item {
  position: relative;
  margin-bottom: 36px;
  padding: 24px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
}
.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 32px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.15);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.page-about .timeline-item.is-current {
  border-color: rgba(0, 194, 168, 0.35);
  background: rgba(0, 194, 168, 0.06);
}
.page-about .timeline-item.is-current::before {
  background: var(--color-teal);
  box-shadow: 0 0 0 4px rgba(0, 194, 168, 0.18);
}
.page-about .timeline-item.is-in-view::before {
  transform: scale(1.25);
  box-shadow: 0 0 0 8px rgba(255, 107, 53, 0.2);
}
.page-about .timeline-item.is-current.is-in-view::before {
  box-shadow: 0 0 0 8px rgba(0, 194, 168, 0.22);
}
.page-about .timeline-version {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 107, 53, 0.06);
  font-family: var(--font-number);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
}
.page-about .timeline-item.is-current .timeline-version {
  color: var(--color-teal);
  border-color: rgba(0, 194, 168, 0.3);
  background: rgba(0, 194, 168, 0.08);
}
.page-about .timeline-title {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-white);
}
.page-about .timeline-desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}
.page-about .timeline-figure {
  margin: 8px 0 36px;
  padding: 8px;
  border-radius: var(--radius);
  background: var(--color-primary);
  border: 1px solid rgba(255, 255, 255, 0.08);
}
.page-about .timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: calc(var(--radius) - 4px);
}

/* 数据规模 */
.page-about .stats-section {
  padding: clamp(48px, 7vw, 88px) 0;
  background:
    repeating-linear-gradient(45deg, rgba(255, 255, 255, 0.012) 0, rgba(255, 255, 255, 0.012) 1px, transparent 1px, transparent 12px),
    linear-gradient(180deg, var(--color-primary), rgba(11, 59, 66, 0.35));
}
.page-about .stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.page-about .stats-item {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 8px;
  min-height: 150px;
  padding: 28px 16px;
  border-radius: var(--radius);
  background: var(--color-deep);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.12);
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}
.page-about .stats-item.is-in-view {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
}
.page-about .stats-item.is-accent {
  background: var(--color-accent);
}
.page-about .stats-item.is-teal {
  background: var(--color-teal);
  color: var(--color-text-light);
}
.page-about .stats-item.is-accent .stats-label {
  color: rgba(255, 255, 255, 0.85);
}
.page-about .stats-item.is-teal .stats-label {
  color: rgba(26, 43, 60, 0.75);
}
.page-about .stats-item.is-featured {
  grid-column: 1 / -1;
  min-height: 180px;
}
.page-about .stats-num {
  font-family: var(--font-number);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-white);
}
.page-about .stats-num.is-large {
  font-size: clamp(2.4rem, 5vw, 3.4rem);
}
.page-about .stats-num--orange {
  color: var(--color-accent);
}
.page-about .stats-num--teal {
  color: var(--color-teal);
}
.page-about .stats-label {
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
}
.page-about .stats-item.is-accent .stats-num {
  color: var(--color-white);
}
.page-about .stats-item.is-teal .stats-num {
  color: var(--color-text-light);
}
.page-about .stats-split {
  grid-column: 1 / -1;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 16px;
}
.page-about .stats-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.page-about .stats-plus {
  color: var(--color-accent);
  font-family: var(--font-number);
  font-size: 1.4rem;
  font-weight: 700;
  align-self: center;
}
.page-about .stats-banner {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 4px;
  padding: 18px 24px;
  border: 1px dashed rgba(0, 194, 168, 0.45);
  border-radius: var(--radius);
  background: rgba(0, 194, 168, 0.05);
  color: var(--color-text-secondary);
  text-align: center;
  font-size: 0.92rem;
}
.page-about .stats-chart {
  margin-top: 36px;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-deep);
  border: 1px solid rgba(255, 255, 255, 0.08);
}
.page-about .stats-chart img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .stats-chart-cap {
  padding: 14px 20px;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

/* 团队与组织 */
.page-about .team-section {
  padding: clamp(48px, 7vw, 88px) 0;
  background:
    linear-gradient(135deg, rgba(255, 107, 53, 0.04), transparent 40%),
    var(--color-light);
  color: var(--color-text-light);
}
.page-about .team-section .section-index {
  color: var(--color-accent);
}
.page-about .team-section .section-index.is-in-view {
  color: var(--color-teal);
}
.page-about .team-section .section-title {
  color: var(--color-text-light);
}
.page-about .team-section .section-desc {
  color: rgba(26, 43, 60, 0.7);
}
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 40px;
}
.page-about .team-item {
  padding: 28px 24px;
  border-radius: var(--radius);
  background: var(--color-white);
  border-top: 3px solid transparent;
  box-shadow: 0 4px 24px rgba(10, 30, 60, 0.06);
}
.page-about .team-item:nth-child(1) {
  border-top-color: var(--color-accent);
}
.page-about .team-item:nth-child(2) {
  border-top-color: var(--color-teal);
}
.page-about .team-item:nth-child(3) {
  border-top-color: var(--color-accent);
}
.page-about .team-item:nth-child(4) {
  border-top-color: var(--color-teal);
}
.page-about .team-title {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-light);
}
.page-about .team-desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.65;
  color: rgba(26, 43, 60, 0.75);
}
.page-about .team-foot {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 20px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid rgba(26, 43, 60, 0.12);
}
.page-about .team-statement {
  max-width: 660px;
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
  color: rgba(26, 43, 60, 0.8);
}
.page-about .team-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 16px;
}
.page-about .team-actions .btn-ghost {
  border-color: rgba(26, 43, 60, 0.4);
  color: var(--color-text-light);
}
.page-about .team-actions .btn-ghost:hover {
  background: rgba(26, 43, 60, 0.06);
  border-color: rgba(26, 43, 60, 0.6);
}
.page-about .team-contact {
  font-family: var(--font-number);
  font-size: 0.85rem;
  color: rgba(26, 43, 60, 0.6);
}

/* 响应式增强 */
@media (min-width: 640px) {
  .page-about .team-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 768px) {
  .page-about .timeline {
    max-width: 760px;
    padding-left: 48px;
  }
  .page-about .timeline-item {
    padding: 28px 32px;
  }
  .page-about .timeline-item::before {
    left: -47px;
    width: 16px;
    height: 16px;
    top: 34px;
  }
  .page-about .timeline-figure {
    padding: 12px;
  }
  .page-about .team-foot {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (min-width: 900px) {
  .page-about .story-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 64px;
  }
}

@media (min-width: 1024px) {
  .page-about .stats-grid {
    grid-template-columns: repeat(6, 1fr);
  }
  .page-about .stats-item {
    grid-column: span 2;
    min-height: 170px;
  }
  .page-about .stats-item.is-featured {
    grid-column: span 2;
    min-height: 170px;
  }
  .page-about .stats-item.is-wide {
    grid-column: span 3;
  }
  .page-about .stats-split {
    grid-column: span 3;
  }
  .page-about .team-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }
}