.page-about {
  --about-hero-bg: linear-gradient(135deg, rgba(0, 212, 255, 0.16), transparent 42%), radial-gradient(circle at 84% 18%, rgba(255, 46, 76, 0.22), transparent 36%);
  --about-border: rgba(255, 255, 255, 0.12);
  --about-blue-glow: 0 0 80px rgba(0, 212, 255, 0.18);
  --about-red-glow: 0 0 60px rgba(255, 46, 76, 0.14);
  color: var(--clr-text);
}

.page-about .breadcrumb {
  padding-top: calc(var(--header-top) + var(--header-h) + 24px);
  padding-bottom: 0;
  font-size: var(--fz-sm);
  color: var(--clr-text-secondary);
}

.page-about .breadcrumb a {
  color: var(--clr-text-secondary);
  text-decoration: none;
  transition: color var(--ease-out);
}

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

.page-about .breadcrumb span[aria-current="page"] {
  color: var(--clr-text);
  font-weight: 600;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 48px 0 56px;
  background: var(--about-hero-bg), var(--clr-bg);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  bottom: -60px;
  left: -8%;
  width: 116%;
  height: 120px;
  background: linear-gradient(100deg, transparent 4%, var(--clr-primary) 24%, transparent 46%, var(--clr-accent) 68%, transparent 90%);
  opacity: 0.14;
  transform: rotate(-3deg);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero-copy {
  max-width: 860px;
}

.page-about .about-hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: var(--fz-md);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--clr-primary);
}

.page-about .about-hero-kicker::before {
  content: "";
  width: 32px;
  height: 2px;
  background: var(--clr-primary);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: var(--fz-3xl);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  line-height: 1.02;
}

.page-about .about-hero-lead {
  margin: 0;
  max-width: 640px;
  font-size: var(--fz-lg);
  line-height: 1.65;
  color: var(--clr-text-secondary);
}

.page-about .about-hero-visual {
  position: relative;
  margin: 40px 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-border);
  box-shadow: var(--shadow-float);
}

.page-about .about-hero-visual img.about-hero-bg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 420px;
  object-fit: cover;
  object-position: center;
}

.page-about .about-hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 12, 16, 0.1), rgba(11, 12, 16, 0.78));
}

.page-about .about-hero-meta {
  position: absolute;
  left: 20px;
  bottom: 18px;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero-meta-tag {
  padding: 6px 14px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: var(--radius-full);
  background: rgba(11, 12, 16, 0.56);
  backdrop-filter: blur(8px);
  font-size: var(--fz-sm);
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--clr-text);
}

.page-about .about-hero-stats {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 36px;
}

.page-about .about-hero-stat-card {
  position: relative;
  padding: 22px 20px;
  background: rgba(20, 22, 30, 0.86);
  border: 1px solid var(--about-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.page-about .about-hero-stat-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--clr-primary);
  opacity: 0.9;
}

.page-about .about-hero-stat-card:nth-child(4n)::before {
  background: var(--clr-accent);
}

.page-about .about-hero-stat-num {
  font-family: var(--font-display);
  font-size: 52px;
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: 1px;
  color: var(--clr-primary);
}

.page-about .about-hero-stat-card:nth-child(4n) .about-hero-stat-num {
  color: var(--clr-accent);
}

.page-about .about-hero-stat-unit {
  margin-left: 6px;
  font-family: var(--font-display);
  font-size: var(--fz-xl);
  font-weight: 700;
  color: var(--clr-text);
}

.page-about .about-hero-stat-label {
  display: block;
  margin-top: 10px;
  font-size: var(--fz-sm);
  color: var(--clr-text-secondary);
}

/* ---------- 我们是谁 ---------- */
.page-about .about-who-wrap {
  display: grid;
  gap: 36px;
}

.page-about .about-who-copy {
  max-width: 760px;
}

.page-about .about-who-copy h2 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: var(--fz-2xl);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  line-height: 1.1;
}

.page-about .about-who-copy p {
  margin: 0 0 16px;
  font-size: var(--fz-md);
  line-height: 1.75;
  color: var(--clr-text-secondary);
}

.page-about .about-who-copy p strong {
  color: var(--clr-text);
}

.page-about .about-who-facts {
  display: grid;
  gap: 14px;
}

.page-about .about-fact-card {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 16px;
  padding: 20px;
  background: var(--clr-card);
  border: 1px solid var(--about-border);
  border-radius: var(--radius-md);
  transition: transform var(--ease-out), box-shadow var(--ease-out), border-color var(--ease-out);
}

.page-about .about-fact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-float);
  border-color: rgba(0, 212, 255, 0.44);
}

.page-about .about-fact-num {
  font-family: var(--font-display);
  font-size: var(--fz-3xl);
  font-weight: 700;
  line-height: 1;
  color: var(--clr-primary);
  min-width: 60px;
}

.page-about .about-fact-card:nth-child(2) .about-fact-num {
  color: var(--clr-success);
}

.page-about .about-fact-card:nth-child(3) .about-fact-num {
  color: var(--clr-warning);
}

.page-about .about-fact-text {
  font-size: var(--fz-sm);
  line-height: 1.6;
  color: var(--clr-text-secondary);
}

/* ---------- 发展里程碑 ---------- */
.page-about .about-section-desc {
  margin: 12px 0 0;
  max-width: 720px;
  font-size: var(--fz-md);
  color: var(--clr-text-secondary);
}

.page-about .about-timeline-wrap {
  position: relative;
  display: grid;
  gap: 28px;
  margin-top: 40px;
}

.page-about .about-timeline-img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 340px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-border);
  box-shadow: var(--shadow-card);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--clr-primary), var(--clr-accent));
  opacity: 0.55;
}

.page-about .about-timeline-item {
  position: relative;
  padding: 0 0 28px 32px;
}

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

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--clr-bg);
  border: 3px solid var(--clr-primary);
  box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.14);
}

.page-about .about-timeline-item:nth-child(even)::before {
  border-color: var(--clr-accent);
  box-shadow: 0 0 0 4px rgba(255, 46, 76, 0.12);
}

.page-about .about-timeline-year {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-size: var(--fz-lg);
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--clr-primary);
}

.page-about .about-timeline-card {
  padding: 18px 20px;
  background: var(--clr-card);
  border: 1px solid var(--about-border);
  border-radius: var(--radius-md);
  transition: transform var(--ease-out), border-color var(--ease-out), box-shadow var(--ease-out);
}

.page-about .about-timeline-card:hover {
  transform: translateX(6px);
  border-color: rgba(0, 212, 255, 0.46);
  box-shadow: var(--shadow-card);
}

.page-about .about-timeline-card h3 {
  margin: 0 0 8px;
  font-size: var(--fz-lg);
  font-weight: 700;
  color: var(--clr-text);
}

.page-about .about-timeline-card p {
  margin: 0;
  font-size: var(--fz-sm);
  line-height: 1.65;
  color: var(--clr-text-secondary);
}

/* ---------- 数据基础设施 ---------- */
.page-about .about-pipeline {
  display: grid;
  gap: 16px;
  margin-top: 40px;
}

.page-about .about-pipeline-step {
  position: relative;
  padding: 26px 24px 24px;
  background: linear-gradient(140deg, rgba(20, 22, 30, 0.96), rgba(28, 31, 40, 0.9));
  border: 1px solid var(--about-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--ease-out), border-color var(--ease-out);
}

.page-about .about-pipeline-step:hover {
  transform: translateY(-5px) rotate(-0.6deg);
  border-color: var(--clr-primary);
}

.page-about .about-pipeline-step::after {
  content: "";
  position: absolute;
  right: -22px;
  top: -22px;
  width: 88px;
  height: 88px;
  background: linear-gradient(135deg, transparent 40%, rgba(0, 212, 255, 0.12));
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-pipeline-num {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-display);
  font-size: var(--fz-xl);
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--clr-accent);
}

.page-about .about-pipeline-step:nth-child(even) .about-pipeline-num {
  color: var(--clr-primary);
}

.page-about .about-pipeline-step h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: var(--fz-xl);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.page-about .about-pipeline-step p {
  margin: 0;
  font-size: var(--fz-sm);
  line-height: 1.65;
  color: var(--clr-text-secondary);
}

.page-about .about-pipeline-note {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 28px;
  padding: 22px;
  background: rgba(0, 212, 255, 0.07);
  border-left: 4px solid var(--clr-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.page-about .about-pipeline-note p {
  margin: 0;
  font-size: var(--fz-md);
  line-height: 1.7;
  color: var(--clr-text);
}

/* ---------- 团队与组织 ---------- */
.page-about .about-team-layout {
  display: grid;
  gap: 28px;
  margin-top: 40px;
}

.page-about .about-team-img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 360px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-border);
  box-shadow: var(--shadow-card);
}

.page-about .about-team-list {
  display: grid;
  gap: 14px;
}

.page-about .about-team-card {
  padding: 22px;
  background: var(--clr-card);
  border: 1px solid var(--about-border);
  border-radius: var(--radius-md);
  transition: transform var(--ease-out), box-shadow var(--ease-out);
}

.page-about .about-team-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-float);
}

.page-about .about-team-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--fz-lg);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--clr-primary);
}

.page-about .about-team-card p {
  margin: 0;
  font-size: var(--fz-sm);
  line-height: 1.65;
  color: var(--clr-text-secondary);
}

.page-about .about-team-total {
  display: inline-block;
  margin-bottom: 8px;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  background: rgba(255, 46, 76, 0.14);
  border: 1px solid rgba(255, 46, 76, 0.4);
  font-family: var(--font-display);
  font-size: var(--fz-md);
  font-weight: 700;
  color: var(--clr-accent);
}

.page-about .about-team-statement {
  margin: 28px 0 0;
  padding: 18px 24px;
  font-size: var(--fz-sm);
  line-height: 1.7;
  color: var(--clr-text-secondary);
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-md);
}

/* ---------- 资质与合作 ---------- */
.page-about .about-qualification {
  position: relative;
}

.page-about .about-qualification::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--clr-primary), var(--clr-accent), transparent);
  opacity: 0.6;
}

.page-about .about-qualification-grid {
  display: grid;
  gap: 16px;
  margin-top: 40px;
}

.page-about .about-qual-card {
  position: relative;
  padding: 26px 24px;
  background: linear-gradient(150deg, rgba(20, 22, 30, 0.96), rgba(20, 22, 30, 0.82));
  border: 1px solid var(--about-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--ease-out), border-color var(--ease-out), box-shadow var(--ease-out);
}

.page-about .about-qual-card:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 46, 76, 0.55);
  box-shadow: var(--about-red-glow), var(--shadow-card);
}

.page-about .about-qual-card:nth-child(even):hover {
  border-color: rgba(0, 212, 255, 0.55);
  box-shadow: var(--about-blue-glow), var(--shadow-card);
}

.page-about .about-qual-badge {
  display: inline-block;
  margin-bottom: 14px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.38);
  font-family: var(--font-display);
  font-size: var(--fz-md);
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--clr-primary);
}

.page-about .about-qual-card:nth-child(even) .about-qual-badge {
  background: rgba(255, 46, 76, 0.1);
  border-color: rgba(255, 46, 76, 0.4);
  color: var(--clr-accent);
}

.page-about .about-qual-card h3 {
  margin: 0 0 10px;
  font-size: var(--fz-lg);
  font-weight: 700;
}

.page-about .about-qual-card p {
  margin: 0;
  font-size: var(--fz-sm);
  line-height: 1.65;
  color: var(--clr-text-secondary);
}

.page-about .about-qualification-footer {
  display: grid;
  gap: 24px;
  margin-top: 36px;
  padding: 24px;
  background: var(--clr-card);
  border: 1px solid var(--about-border);
  border-radius: var(--radius-lg);
}

.page-about .about-qual-img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 260px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.page-about .about-qual-footer-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
}

.page-about .about-qual-footer-copy h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: var(--fz-xl);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.page-about .about-qual-footer-copy p:not(.section-kicker) {
  margin: 0 0 16px;
  font-size: var(--fz-sm);
  line-height: 1.7;
  color: var(--clr-text-secondary);
}

/* ---------- 滚动显现 ---------- */
.page-about .reveal[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.page-about .reveal[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

.page-about .reveal.is-visible {
  opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .reveal[data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-timeline-card:hover,
  .page-about .about-pipeline-step:hover,
  .page-about .about-team-card:hover,
  .page-about .about-fact-card:hover,
  .page-about .about-qual-card:hover {
    transform: none;
  }
}

/* ---------- 平板以上 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-hero-stat-num {
    font-size: 62px;
  }

  .page-about .about-who-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-timeline-item {
    padding-left: 40px;
  }

  .page-about .about-pipeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-pipeline-note {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .about-pipeline-note p {
    max-width: 780px;
  }

  .page-about .about-pipeline-note .link-more {
    white-space: nowrap;
  }

  .page-about .about-qualification-footer {
    grid-template-columns: 5fr 6fr;
    align-items: center;
  }

  .page-about .about-qualification-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1100px) {
  .page-about .about-hero {
    padding: 72px 0 88px;
  }

  .page-about .about-hero h1 {
    font-size: var(--fz-4xl);
  }

  .page-about .about-hero-visual img.about-hero-bg {
    max-height: 520px;
  }

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

  .page-about .about-who-wrap {
    grid-template-columns: 7fr 5fr;
    gap: 72px;
    align-items: center;
  }

  .page-about .about-who-facts {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .page-about .about-timeline-wrap {
    grid-template-columns: 5fr 7fr;
    gap: 44px;
    align-items: start;
  }

  .page-about .about-timeline-img {
    position: sticky;
    top: calc(var(--header-top) + var(--header-h) + 24px);
    max-height: 480px;
  }

  .page-about .about-pipeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-pipeline-step {
    min-height: 260px;
  }

  .page-about .about-team-layout {
    grid-template-columns: 5fr 7fr;
    gap: 44px;
    align-items: center;
  }

  .page-about .about-team-img {
    max-height: 460px;
  }

  .page-about .about-team-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-qualification-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-qual-footor-copy h3 {
    font-size: var(--fz-2xl);
  }
}