.page-about {
  --page-accent-blue: #00D4FF;
  --page-accent-purple: #9500FF;
  --page-bg-primary: #0A0E1A;
  --page-bg-secondary: #12172B;
  --page-text-white: #FFFFFF;
  --page-text-light: #B0B8C8;
  --page-text-dim: #6A7284;
  --page-font-heading: 'Inter', 'PingFang SC', system-ui, sans-serif;
  --page-font-body: 'Inter', 'PingFang SC', system-ui, sans-serif;
  --page-font-data: 'JetBrains Mono', 'Courier New', monospace;
  --page-gap: 24px;
  --page-radius: 8px;
  --page-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 面包屑 ===== */
.page-about .page-about__breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--page-font-body);
  font-size: 0.875rem;
  color: var(--page-text-dim);
  margin-bottom: 24px;
  position: relative;
  z-index: 2;
}
.page-about .page-about__breadcrumb a {
  color: var(--page-text-light);
  text-decoration: none;
  transition: color var(--page-transition);
}
.page-about .page-about__breadcrumb a:hover {
  color: var(--page-accent-blue);
}
.page-about .page-about__breadcrumb span[aria-current="page"] {
  color: var(--page-accent-blue);
}

/* ===== 首屏 Hero ===== */
.page-about .page-about__hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--page-bg-primary);
  overflow: hidden;
  padding-top: calc(var(--header-height, 72px) + 32px);
  padding-bottom: 64px;
}
.page-about .page-about__hero-bg-wrap {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.page-about .page-about__hero-bg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.25;
  filter: grayscale(0.6) contrast(1.2) brightness(0.5);
}
.page-about .page-about__hero-gradient {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 40%;
  background: linear-gradient(to top, #0A0E1A 0%, transparent 100%);
  z-index: 1;
}
.page-about .page-about__hero-inner {
  position: relative;
  z-index: 2;
  width: 100%;
}
.page-about .page-about__hero-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--gap);
}
.page-about .page-about__hero-brand {
  font-family: var(--page-font-heading);
  font-weight: 800;
  font-size: clamp(3.5rem, 12vw, 8rem);
  line-height: 1.05;
  color: var(--page-text-white);
  margin: 0 0 8px;
  letter-spacing: -0.02em;
  text-shadow: 0 0 60px rgba(0, 212, 255, 0.25);
}
.page-about .page-about__hero-sub {
  font-family: var(--page-font-heading);
  font-weight: 600;
  font-size: clamp(1.125rem, 3vw, 1.75rem);
  color: var(--page-text-light);
  margin: 0 0 16px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
}
.page-about .page-about__hero-slogan {
  font-family: var(--page-font-heading);
  font-weight: 800;
  font-size: clamp(2rem, 6vw, 4rem);
  line-height: 1.1;
  color: var(--page-accent-blue);
  margin: 0 0 16px;
  text-shadow: 0 0 40px rgba(0, 212, 255, 0.45), 0 0 80px rgba(0, 212, 255, 0.2);
  letter-spacing: 0.04em;
}
.page-about .page-about__hero-desc {
  font-family: var(--page-font-body);
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--page-text-dim);
  margin: 0;
  letter-spacing: 0.15em;
}

/* ===== 通用章节标题 ===== */
.page-about .page-about__section-heading {
  font-family: var(--page-font-heading);
  font-weight: 800;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.1;
  color: var(--page-text-white);
  margin: 0 0 20px;
  position: relative;
}
.page-about .page-about__section-heading::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 1.2em;
  background: var(--page-accent-blue);
  margin-right: 12px;
  vertical-align: -0.15em;
  border-radius: 3px;
}
.page-about .page-about__section-heading--center {
  text-align: center;
}
.page-about .page-about__section-heading--center::before {
  display: none;
}

/* ===== 使命章节 ===== */
.page-about .page-about__mission {
  background: var(--page-bg-secondary);
  padding-top: 80px;
  padding-bottom: 80px;
}
.page-about .page-about__mission .grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--page-gap);
  align-items: center;
}
.page-about .page-about__mission-text {
  padding-right: 32px;
}
.page-about .page-about__mission-para {
  font-family: var(--page-font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--page-text-light);
  margin: 0 0 16px;
}
.page-about .page-about__mission-para:last-child {
  margin-bottom: 0;
}
.page-about .page-about__mission-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 240px;
}
.page-about .page-about__data-flow {
  position: relative;
  width: 300px;
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}
.page-about .page-about__data-line {
  display: block;
  width: 6px;
  height: 60%;
  background: linear-gradient(to top, var(--page-accent-blue), var(--page-accent-purple));
  border-radius: 3px;
  animation: page-about-pulse-line 1.8s ease-in-out infinite;
  animation-delay: var(--delay, 0s);
  opacity: 0.7;
}
@keyframes page-about-pulse-line {
  0%, 100% { height: 40%; opacity: 0.4; }
  50% { height: 90%; opacity: 1; }
}

/* ===== 理念演变时间线 ===== */
.page-about .page-about__journey {
  background: var(--page-bg-primary);
  padding-top: 80px;
  padding-bottom: 80px;
  position: relative;
}
.page-about .page-about__journey-sub {
  text-align: center;
  font-family: var(--page-font-body);
  font-size: 1.0625rem;
  color: var(--page-text-dim);
  margin: -8px 0 48px;
}
.page-about .page-about__timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--page-gap);
  position: relative;
}
.page-about .page-about__timeline::before {
  content: '';
  position: absolute;
  top: 40px;
  left: calc(12.5% + 12px);
  right: calc(12.5% + 12px);
  height: 2px;
  background: linear-gradient(to right, var(--page-accent-blue), var(--page-accent-purple));
  opacity: 0.3;
  z-index: 0;
}
.page-about .page-about__timeline-item {
  position: relative;
  z-index: 1;
  padding-top: 80px;
}
.page-about .page-about__timeline-item::before {
  content: '';
  position: absolute;
  top: 34px;
  left: 50%;
  transform: translateX(-50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--page-bg-primary);
  border: 3px solid var(--page-accent-blue);
  box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.15);
  transition: box-shadow var(--page-transition), border-color var(--page-transition);
}
.page-about .page-about__timeline-item:hover::before {
  border-color: var(--page-accent-purple);
  box-shadow: 0 0 0 6px rgba(149, 0, 255, 0.2);
}
.page-about .page-about__timeline-card {
  background: var(--page-bg-secondary);
  border-radius: var(--page-radius);
  padding: 24px 20px;
  border: 1px solid rgba(0, 212, 255, 0.1);
  transition: transform var(--page-transition), border-color var(--page-transition), box-shadow var(--page-transition);
  cursor: default;
  transform: rotate(0deg);
  position: relative;
  overflow: hidden;
}
.page-about .page-about__timeline-card::after {
  content: attr(data-hover-desc);
  position: absolute;
  inset: 0;
  background: var(--page-bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  font-family: var(--page-font-body);
  font-size: 0.9375rem;
  color: var(--page-text-light);
  line-height: 1.6;
  opacity: 0;
  transform: rotateY(180deg);
  transition: opacity var(--page-transition), transform var(--page-transition);
  backface-visibility: hidden;
  border-radius: var(--page-radius);
}
.page-about .page-about__timeline-card:hover::after {
  opacity: 1;
  transform: rotateY(0deg);
}
.page-about .page-about__timeline-card:hover .page-about__timeline-num,
.page-about .page-about__timeline-card:hover .page-about__timeline-title,
.page-about .page-about__timeline-card:hover .page-about__timeline-desc {
  opacity: 0;
  pointer-events: none;
}
.page-about .page-about__timeline-card:hover {
  transform: rotate(0deg) translateY(-4px);
  border-color: var(--page-accent-blue);
  box-shadow: 0 12px 32px rgba(0, 212, 255, 0.12);
}
.page-about .page-about__timeline-num {
  font-family: var(--page-font-heading);
  font-weight: 800;
  font-size: 2.5rem;
  line-height: 1;
  color: var(--page-accent-purple);
  display: block;
  margin-bottom: 12px;
  transition: opacity var(--page-transition);
}
.page-about .page-about__timeline-title {
  font-family: var(--page-font-heading);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--page-text-white);
  margin: 0 0 8px;
  transition: opacity var(--page-transition);
}
.page-about .page-about__timeline-desc {
  font-family: var(--page-font-body);
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--page-text-light);
  margin: 0;
  transition: opacity var(--page-transition);
}

/* ===== 数据驱动章节 ===== */
.page-about .page-about__data-driven {
  background: var(--page-bg-secondary);
  padding-top: 80px;
  padding-bottom: 80px;
}
.page-about .page-about__data-driven .grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.page-about .page-about__data-driven-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about .page-about__data-chart-wrap {
  position: relative;
  width: 100%;
  max-width: 500px;
  border-radius: var(--page-radius);
  overflow: hidden;
  border: 1px solid rgba(0, 212, 255, 0.12);
  box-shadow: 0 0 40px rgba(0, 212, 255, 0.06);
}
.page-about .page-about__data-chart {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}
.page-about .page-about__data-driven-text {
  padding-left: 16px;
}
.page-about .page-about__data-driven-para {
  font-family: var(--page-font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--page-text-light);
  margin: 0 0 16px;
}
.page-about .page-about__data-stats {
  display: flex;
  gap: 24px;
  margin-top: 32px;
  flex-wrap: wrap;
}
.page-about .page-about__stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.page-about .page-about__stat-value {
  font-family: var(--page-font-data);
  font-weight: 600;
  font-size: 1.75rem;
  color: var(--page-accent-blue);
}
.page-about .page-about__stat-label {
  font-family: var(--page-font-body);
  font-size: 0.8125rem;
  color: var(--page-text-dim);
  letter-spacing: 0.04em;
}

/* ===== 本地化承诺章节 ===== */
.page-about .page-about__local {
  background: var(--page-bg-primary);
  padding-top: 80px;
  padding-bottom: 80px;
}
.page-about .page-about__local .grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.page-about .page-about__local-text {
  padding-right: 16px;
}
.page-about .page-about__local-para {
  font-family: var(--page-font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--page-text-light);
  margin: 0 0 16px;
}
.page-about .page-about__local-contact {
  margin-top: 32px;
  padding: 24px;
  border-radius: var(--page-radius);
}
.page-about .page-about__local-contact-label {
  font-family: var(--page-font-body);
  font-size: 0.9375rem;
  color: var(--page-text-dim);
  margin: 0 0 8px;
}
.page-about .page-about__local-email {
  font-family: var(--page-font-body);
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--page-accent-blue);
  text-decoration: none;
  transition: color var(--page-transition), text-shadow var(--page-transition);
  display: inline-block;
  margin-bottom: 8px;
}
.page-about .page-about__local-email:hover {
  color: var(--page-text-white);
  text-shadow: 0 0 20px rgba(0, 212, 255, 0.35);
}
.page-about .page-about__local-contact-note {
  font-family: var(--page-font-body);
  font-size: 0.875rem;
  color: var(--page-text-dim);
  margin: 0;
  font-style: italic;
}
.page-about .page-about__local-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about .page-about__local-map {
  width: 100%;
  max-width: 480px;
  height: auto;
  border-radius: var(--page-radius);
  object-fit: cover;
  border: 1px solid rgba(149, 0, 255, 0.12);
  box-shadow: 0 0 32px rgba(149, 0, 255, 0.06);
}

/* ===== CTA 章节 ===== */
.page-about .page-about__cta {
  background: var(--page-bg-secondary);
  padding-top: 72px;
  padding-bottom: 72px;
}
.page-about .page-about__cta-desc {
  font-family: var(--page-font-body);
  font-size: 1.125rem;
  color: var(--page-text-light);
  margin: 0 0 32px;
}
.page-about .page-about__cta-links {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.page-about .page-about__cta-links .btn {
  padding: 14px 32px;
  font-family: var(--page-font-heading);
  font-weight: 700;
  font-size: 1rem;
  border-radius: 6px;
  text-decoration: none;
  transition: background var(--page-transition), color var(--page-transition), box-shadow var(--page-transition), transform var(--page-transition);
  display: inline-block;
}
.page-about .page-about__cta-links .btn-primary {
  background: var(--page-accent-blue);
  color: #0A0E1A;
  border: none;
}
.page-about .page-about__cta-links .btn-primary:hover {
  background: #33ddff;
  box-shadow: 0 0 32px rgba(0, 212, 255, 0.3);
  transform: translateY(-2px);
}
.page-about .page-about__cta-links .btn-outline {
  background: transparent;
  color: var(--page-accent-purple);
  border: 2px solid var(--page-accent-purple);
}
.page-about .page-about__cta-links .btn-outline:hover {
  background: rgba(149, 0, 255, 0.1);
  box-shadow: 0 0 24px rgba(149, 0, 255, 0.2);
  transform: translateY(-2px);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .page-about .page-about__hero {
    min-height: 70vh;
    padding-top: calc(var(--header-height, 72px) + 24px);
    padding-bottom: 40px;
  }
  .page-about .page-about__hero-brand {
    font-size: clamp(2.8rem, 14vw, 4.5rem);
  }
  .page-about .page-about__hero-slogan {
    font-size: clamp(1.6rem, 7vw, 2.8rem);
  }
  .page-about .page-about__mission .grid,
  .page-about .page-about__data-driven .grid,
  .page-about .page-about__local .grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .page-about .page-about__mission-text,
  .page-about .page-about__data-driven-text,
  .page-about .page-about__local-text {
    padding-right: 0;
    padding-left: 0;
  }
  .page-about .page-about__mission-visual {
    min-height: 160px;
    order: -1;
  }
  .page-about .page-about__data-driven-visual {
    order: -1;
  }
  .page-about .page-about__local-visual {
    order: -1;
  }
  .page-about .page-about__timeline {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .page-about .page-about__timeline::before {
    display: none;
  }
  .page-about .page-about__timeline-item {
    padding-top: 0;
  }
  .page-about .page-about__timeline-item::before {
    display: none;
  }
  .page-about .page-about__timeline-card {
    transform: rotate(0deg) !important;
  }
  .page-about .page-about__timeline-card::after {
    display: none;
  }
  .page-about .page-about__timeline-card:hover .page-about__timeline-num,
  .page-about .page-about__timeline-card:hover .page-about__timeline-title,
  .page-about .page-about__timeline-card:hover .page-about__timeline-desc {
    opacity: 1;
  }
  .page-about .page-about__data-stats {
    flex-direction: column;
    gap: 16px;
  }
  .page-about .page-about__cta-links {
    flex-direction: column;
    align-items: center;
  }
  .page-about .page-about__cta-links .btn {
    width: 100%;
    max-width: 280px;
    text-align: center;
  }
  .page-about .page-about__section-heading {
    font-size: clamp(1.6rem, 5vw, 2.2rem);
  }
  .page-about .page-about__data-chart-wrap {
    max-width: 100%;
  }
  .page-about .page-about__local-map {
    max-width: 100%;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .page-about .page-about__timeline {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--page-gap);
  }
  .page-about .page-about__timeline::before {
    display: none;
  }
  .page-about .page-about__timeline-item {
    padding-top: 0;
  }
  .page-about .page-about__timeline-item::before {
    display: none;
  }
  .page-about .page-about__mission .grid,
  .page-about .page-about__data-driven .grid,
  .page-about .page-about__local .grid {
    gap: 32px;
  }
}

.page-about {
  --delay: inherit;
}