.page-about {
  position: relative;
  background: var(--c-primary);
  color: var(--c-white);
  overflow: hidden;
}

/* ===== 首屏 ===== */
.page-about__hero {
  position: relative;
  padding: 28px 0 96px;
  background:
    radial-gradient(ellipse at 80% 10%, rgba(255, 107, 53, 0.14) 0%, transparent 48%),
    linear-gradient(180deg, var(--c-secondary) 0%, var(--c-primary) 100%);
  overflow: hidden;
}
.page-about__hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, transparent 80%, rgba(255, 107, 53, 0.5) 80%, rgba(255, 107, 53, 0.5) 81%, transparent 81%),
    linear-gradient(45deg, transparent 88%, rgba(0, 255, 136, 0.18) 88%, rgba(0, 255, 136, 0.18) 89%, transparent 89%);
  pointer-events: none;
}
.page-about__hero-inner {
  position: relative;
  z-index: 1;
}
.page-about__hero-eyebrow {
  margin: 24px 0 0;
  color: var(--c-green);
  font-family: var(--f-data);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.page-about__hero h1 {
  margin: 16px 0;
  max-width: 15em;
  font-family: var(--f-headline);
  font-weight: 900;
  font-size: clamp(32px, 6vw, 60px);
  line-height: 1.18;
}
.page-about__hero-strong {
  color: var(--c-white);
}
.page-about__hero-sep {
  color: var(--c-orange);
  font-weight: 300;
  margin: 0 0.1em;
}
.page-about__hero-dim {
  color: var(--c-text-secondary);
}
.page-about__hero-lead {
  max-width: 56ch;
  margin: 20px 0 0;
  color: var(--c-text-secondary);
  font-size: 17px;
  line-height: 1.85;
}
.page-about__hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}
.page-about__hero-stat {
  min-width: 128px;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.06);
  border-left: 3px solid var(--c-orange);
}
.page-about__hero-num {
  display: block;
  color: var(--c-orange);
  font-family: var(--f-data);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.2;
}
.page-about__hero-label {
  display: block;
  margin-top: 4px;
  color: var(--c-text-secondary);
  font-size: 13px;
}
.page-about__hero-marker {
  position: absolute;
  right: 0;
  bottom: 4px;
  z-index: 0;
  color: rgba(255, 255, 255, 0.03);
  font-family: var(--f-data);
  font-size: clamp(44px, 10vw, 120px);
  font-weight: 800;
  letter-spacing: 0.04em;
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
}

/* ===== 品牌故事 ===== */
.page-about__story {
  padding: 72px 0 40px;
}
.page-about__story-grid {
  gap: 40px;
  align-items: center;
}
.page-about__story-copy p {
  margin: 16px 0;
  color: var(--c-text-secondary);
  line-height: 1.85;
}
.page-about__mark-text {
  color: var(--c-green);
  font-family: var(--f-data);
  font-weight: 700;
}
.page-about__story-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.page-about__story-figure {
  margin: 0;
  overflow: hidden;
  position: relative;
  aspect-ratio: 4 / 3;
}
.page-about__story-figure::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--c-orange), var(--c-green));
  pointer-events: none;
}
.page-about__story-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== 发展里程碑 ===== */
.page-about__milestones {
  position: relative;
  padding: 72px 0;
  background: linear-gradient(180deg, var(--c-secondary) 0%, rgba(22, 33, 62, 0.92) 100%);
}
.page-about__milestones::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-orange) 0%, var(--c-green) 70%, var(--c-highlight) 100%);
}
.page-about__milestones-layout {
  display: block;
}
.page-about__milestones-aside {
  margin-bottom: 40px;
}
.page-about__milestones-brand {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.page-about__brand-mark {
  display: inline-flex;
  align-items: center;
  padding: 10px 14px;
  background: var(--c-orange);
  color: var(--c-white);
  font-family: var(--f-data);
  font-weight: 800;
  font-size: 22px;
  line-height: 1;
  transform: skewX(-6deg);
}
.page-about__milestones-brand p {
  margin: 0;
  color: var(--c-text-secondary);
  font-family: var(--f-data);
  font-size: 12px;
  letter-spacing: 0.14em;
}
.page-about__milestones-desc {
  margin: 12px 0 0;
  color: var(--c-text-secondary);
  line-height: 1.75;
}
.page-about__timeline {
  position: relative;
  padding-left: 28px;
}
.page-about__timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-orange), var(--c-green) 60%, var(--c-highlight));
  opacity: 0.6;
}
.page-about__milestone {
  position: relative;
  margin-bottom: 28px;
}
.page-about__milestone::before {
  content: '';
  position: absolute;
  left: -24px;
  top: 30px;
  width: 10px;
  height: 10px;
  background: var(--c-orange);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.16);
}
.page-about__milestone:nth-child(2)::before {
  background: var(--c-green);
  box-shadow: 0 0 0 4px rgba(0, 255, 136, 0.16);
}
.page-about__milestone:nth-child(3)::before {
  background: var(--c-highlight);
  box-shadow: 0 0 0 4px rgba(255, 195, 0, 0.16);
}
.page-about__milestone-card {
  position: relative;
  padding: 26px 26px 24px;
  background: var(--c-surface);
  clip-path: polygon(14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%, 0 14px);
}
.page-about__milestone-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 4px;
  background: var(--c-orange);
  pointer-events: none;
}
.page-about__milestone:nth-child(2) .page-about__milestone-card::before {
  background: var(--c-green);
}
.page-about__milestone:nth-child(3) .page-about__milestone-card::before {
  background: var(--c-highlight);
}
.page-about__milestone-year {
  display: block;
  margin-bottom: 4px;
  color: var(--c-muted);
  font-family: var(--f-data);
  font-size: 12px;
  letter-spacing: 0.08em;
}
.page-about__milestone-ver {
  display: inline-block;
  margin-bottom: 14px;
  padding: 4px 10px;
  background: var(--c-orange);
  color: var(--c-white);
  font-family: var(--f-data);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.2;
}
.page-about__milestone:nth-child(2) .page-about__milestone-ver {
  background: var(--c-green);
  color: var(--c-primary);
}
.page-about__milestone:nth-child(3) .page-about__milestone-ver {
  background: var(--c-highlight);
  color: var(--c-primary);
}
.page-about__milestone-card h3 {
  margin: 12px 0 10px;
  font-family: var(--f-headline);
  font-size: 22px;
  font-weight: 800;
}
.page-about__milestone-card p {
  margin: 0;
  color: var(--c-text-secondary);
  font-size: 15px;
  line-height: 1.8;
}
.page-about__milestone-figure {
  margin: 36px 0 0;
  overflow: hidden;
  position: relative;
  aspect-ratio: 3 / 1;
}
.page-about__milestone-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== 数据能力 ===== */
.page-about__capability {
  padding: 72px 0;
}
.page-about__capability-head {
  margin-bottom: 40px;
}
.page-about__capability-desc {
  margin: 0;
  color: var(--c-text-secondary);
  line-height: 1.85;
}
.page-about__capability-grid {
  gap: 40px;
}
.page-about__chart {
  padding: 24px;
  background: rgba(255, 255, 255, 0.04);
  border-top: 3px solid var(--c-green);
}
.page-about__chart-row {
  margin-bottom: 26px;
}
.page-about__chart-row:last-child {
  margin-bottom: 0;
}
.page-about__chart-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}
.page-about__chart-label {
  color: var(--c-text-secondary);
  font-size: 14px;
}
.page-about__chart-value {
  color: var(--c-green);
  font-family: var(--f-data);
  font-weight: 700;
  font-size: 18px;
}
.page-about__chart-track {
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
  transform: skewX(-12deg);
}
.page-about__chart-fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--c-orange), var(--c-green));
}
.page-about__capability-notes p {
  margin: 0 0 18px;
  color: var(--c-text-secondary);
  line-height: 1.85;
}
.page-about__capability-notes strong {
  color: var(--c-white);
}
.page-about__capability-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.page-about__capability-list li {
  position: relative;
  padding-left: 22px;
  color: var(--c-text-secondary);
  font-size: 15px;
  line-height: 1.6;
}
.page-about__capability-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 12px;
  height: 2px;
  background: var(--c-green);
}
.page-about__capability-figure {
  margin: 0;
  overflow: hidden;
  position: relative;
  aspect-ratio: 5 / 3;
}
.page-about__capability-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== 服务生态 ===== */
.page-about__ecosystem {
  padding: 72px 0;
}
.page-about__ecosystem-head {
  margin-bottom: 40px;
}
.page-about__ecosystem-desc {
  margin: 0;
  color: var(--c-text-secondary);
  line-height: 1.85;
}
.page-about__ecosystem-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about__eco-card {
  position: relative;
  padding: 28px 24px;
  background: rgba(255, 255, 255, 0.05);
  border-bottom: 3px solid var(--c-orange);
}
.page-about__eco-card:nth-child(even) {
  border-bottom-color: var(--c-green);
}
.page-about__eco-index {
  color: var(--c-green);
  font-family: var(--f-data);
  font-size: 13px;
  letter-spacing: 0.1em;
}
.page-about__eco-card h3 {
  margin: 12px 0 10px;
  font-family: var(--f-headline);
  font-size: 20px;
  font-weight: 800;
}
.page-about__eco-card p {
  margin: 0;
  color: var(--c-text-secondary);
  font-size: 15px;
  line-height: 1.75;
}
.page-about__ecosystem-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  margin-top: 32px;
  padding: 24px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}
.page-about__ecosystem-bottom p {
  margin: 0;
  color: var(--c-text-secondary);
  line-height: 1.7;
}

/* ===== 滚动显现 ===== */
.js-enabled .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.js-enabled .page-about [data-reveal][data-visible] {
  opacity: 1;
  transform: none;
}

/* ===== 桌面端布局 ===== */
@media (min-width: 900px) {
  .page-about__hero {
    padding: 40px 0 120px;
  }
  .page-about__hero-lead {
    max-width: 60ch;
    font-size: 19px;
  }
  .page-about__hero-stats {
    gap: 16px;
  }
  .page-about__hero-stat {
    min-width: 140px;
  }
  .page-about__story {
    padding: 100px 0 64px;
  }
  .page-about__story-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }
  .page-about__milestones-layout {
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: 56px;
    align-items: start;
  }
  .page-about__milestones-aside {
    position: sticky;
    top: calc(var(--header-height) + 24px);
  }
  .page-about__timeline {
    padding-left: 36px;
  }
  .page-about__milestone::before {
    left: -32px;
  }
  .page-about__capability {
    padding: 100px 0;
  }
  .page-about__capability-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-about__capability-figure {
    grid-column: 1 / -1;
  }
  .page-about__ecosystem {
    padding: 100px 0;
  }
  .page-about__ecosystem-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== 减弱动效 ===== */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}