.page-about {
  --about-node-accent: var(--orange);
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.6vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  margin: 10px 0 16px;
}

.page-about h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
}

.page-about .lead {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
  max-width: 42em;
  margin: 0;
}

.page-about .eyebrow {
  color: var(--teal);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0;
}

.page-about .about-body {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
  max-width: 40em;
  margin: 0 0 14px;
}

.page-about p:last-child {
  margin-bottom: 0;
}

.page-about .breadcrumb {
  margin: 0 0 4px;
  padding-top: 22px;
}

.page-about .breadcrumb__link,
.page-about .breadcrumb__current {
  font-size: 13px;
  color: var(--muted);
}

.page-about .breadcrumb__link:hover {
  color: var(--orange);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-bottom: clamp(48px, 8vw, 96px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(90% 120% at 88% -10%, rgba(47, 211, 180, 0.16), transparent 60%),
    radial-gradient(75% 110% at 4% 110%, rgba(255, 107, 44, 0.15), transparent 62%),
    var(--ink);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(33, 65, 92, 0.35) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(33, 65, 92, 0.28) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(120% 90% at 50% 0%, #000 20%, transparent 78%);
  mask-image: radial-gradient(120% 90% at 50% 0%, #000 20%, transparent 78%);
  opacity: 0.75;
}

.page-about .about-hero .container {
  position: relative;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
  margin-top: 26px;
}

.page-about .about-hero h1 {
  margin: 14px 0 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7vw, 64px);
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.page-about .about-hero__hl {
  color: var(--orange);
  display: inline-block;
}

.page-about .about-hero__lead {
  max-width: 34em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__console {
  position: relative;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(18, 40, 61, 0.96), rgba(12, 29, 47, 0.96));
  box-shadow: 0 30px 60px -40px rgba(0, 0, 0, 0.9);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-hero__console-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 14px;
  margin-bottom: 14px;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-hero__console-head .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-hero__lanes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-hero__lane {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(7, 19, 32, 0.6);
}

.page-about .about-hero__lane--a {
  border-left: 3px solid var(--orange);
}

.page-about .about-hero__lane--b {
  border-left: 3px solid var(--teal);
}

.page-about .about-hero__lane-code {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
}

.page-about .about-hero__lane-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
}

.page-about .about-hero__lane-state {
  flex: 1 0 100%;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

.page-about .about-hero__console-note {
  margin: 14px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 12px;
  margin: 16px 0 0;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
}

.page-about .about-hero__stats dt {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
}

.page-about .about-hero__stats dd {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 24px;
  letter-spacing: -0.01em;
  color: var(--white);
}

/* ---------- 双版本机制 ---------- */
.page-about .about-dual {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--ink-2);
  border-bottom: 1px solid var(--line);
}

.page-about .about-dual__head {
  max-width: 46em;
  margin-bottom: 32px;
}

.page-about .about-dual__compare {
  display: grid;
  gap: 16px;
  margin-bottom: 32px;
}

.page-about .about-dual__col {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(7, 19, 32, 0.55);
}

.page-about .about-dual__col--a {
  border-top: 3px solid var(--orange);
}

.page-about .about-dual__col--b {
  border-top: 3px solid var(--teal);
}

.page-about .about-dual__col-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .about-dual__col-head .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-dual__col-head h3 {
  margin: 0;
  font-size: 21px;
}

.page-about .about-dual__col p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-dual__spine {
  height: 1px;
  background: linear-gradient(90deg, var(--orange), var(--teal));
  opacity: 0.7;
}

.page-about .about-dual__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-dual__fact {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-dual__fact:hover {
  border-color: var(--orange-soft);
  transform: translateY(-2px);
}

.page-about .about-dual__fact .mono {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
  margin-bottom: 8px;
}

.page-about .about-dual__fact h3 {
  font-size: 18px;
}

.page-about .about-dual__fact p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .about-timeline__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-timeline__index {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-timeline__index a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 12px;
  border-left: 2px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-timeline__index a .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .about-timeline__index a:hover,
.page-about .about-timeline__index a:focus-visible {
  color: var(--white);
  border-left-color: var(--orange);
  background: rgba(255, 107, 44, 0.09);
}

.page-about .about-timeline__figure {
  margin: 0 0 4px;
}

.page-about .figure__media {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.page-about .figure__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .figure__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-timeline__nodes {
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 25px;
  position: relative;
  display: grid;
  gap: 18px;
}

.page-about .about-timeline__nodes::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--orange), var(--teal));
  opacity: 0.55;
}

.page-about .about-timeline__node {
  --about-node-accent: var(--orange);
  position: relative;
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-timeline__node--pass {
  --about-node-accent: var(--teal);
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 26px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--about-node-accent);
  box-shadow: 0 0 0 4px rgba(255, 107, 44, 0.1);
}

.page-about .about-timeline__node--pass::before {
  box-shadow: 0 0 0 4px rgba(47, 211, 180, 0.12);
}

.page-about .about-timeline__node:hover {
  border-color: var(--about-node-accent);
  transform: translateY(-2px);
}

.page-about .about-timeline__node-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  margin-bottom: 8px;
}

.page-about .about-timeline__code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--about-node-accent);
}

.page-about .about-timeline__year {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 26px;
  letter-spacing: -0.01em;
}

.page-about .about-timeline__stage {
  margin-left: auto;
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-timeline__node h3 {
  font-size: 19px;
}

.page-about .about-timeline__node p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 服务网络 ---------- */
.page-about .about-network {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--ink-2);
  border-bottom: 1px solid var(--line);
}

.page-about .about-network__head {
  max-width: 46em;
}

.page-about .about-network__body {
  display: grid;
  gap: 28px;
  margin-top: 30px;
}

.page-about .about-network__figure {
  margin: 0;
}

.page-about .about-network__cards {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
}

.page-about .about-network__card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(18, 40, 61, 0.92), rgba(12, 29, 47, 0.92));
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-network__card:hover,
.page-about .about-network__card:focus-within {
  border-color: var(--teal);
  transform: translateY(-2px);
}

.page-about .about-network__card--alt:hover,
.page-about .about-network__card--alt:focus-within {
  border-color: var(--orange);
}

.page-about .about-network__num {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 38px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--teal);
}

.page-about .about-network__card--alt .about-network__num {
  color: var(--orange);
}

.page-about .about-network__card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}

.page-about .about-network__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 团队与资质 ---------- */
.page-about .about-trust {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .about-trust__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-trust__figure {
  margin: 0;
}

.page-about .about-trust__certs {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-trust__item {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-trust__badge {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--teal);
}

.page-about .about-trust__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .about-ecosystem {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--ink-2);
  border-bottom: 1px solid var(--line);
}

.page-about .about-ecosystem__head {
  max-width: 46em;
}

.page-about .about-ecosystem__map {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .about-ecosystem__hub {
  padding: 20px;
  border: 1px solid var(--orange);
  border-radius: var(--radius);
  background: rgba(255, 107, 44, 0.1);
  text-align: center;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-ecosystem__hub .mono {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
  margin-bottom: 6px;
}

.page-about .about-ecosystem__hub p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
}

.page-about .about-ecosystem__ring {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.page-about .about-ecosystem__node {
  display: grid;
  gap: 4px;
  padding: 14px 12px;
  text-align: center;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background: rgba(7, 19, 32, 0.5);
  transition: border-color 0.18s var(--ease), border-style 0.18s var(--ease);
}

.page-about .about-ecosystem__node:hover {
  border-style: solid;
  border-color: var(--teal);
}

.page-about .about-ecosystem__node-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
}

.page-about .about-ecosystem__node-desc {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.6;
}

.page-about .about-ecosystem__meta {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px dashed var(--line);
}

.page-about .arrow-link {
  display: inline-block;
  margin-top: 4px;
  font-size: 14px;
  font-weight: 600;
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 211, 180, 0.4);
  padding-bottom: 2px;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .arrow-link:hover {
  color: var(--white);
  border-bottom-color: var(--white);
}

/* ---------- 开放日 ---------- */
.page-about .about-open {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .about-open__inner {
  display: grid;
  gap: 28px;
}

.page-about .about-open__stats {
  display: grid;
  gap: 12px;
  margin: 0;
}

.page-about .about-open__stats > div {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.page-about .about-open__stats dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 6px;
}

.page-about .about-open__stats dd {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 32px;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--ink-2);
}

.page-about .about-next__panel {
  padding: clamp(22px, 4vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(140deg, rgba(255, 107, 44, 0.12), rgba(47, 211, 180, 0.08)),
    var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-next__panel h2 {
  margin-top: 0;
}

.page-about .about-next__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-next__list a {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 14px 10px;
  color: var(--white);
  text-decoration: none;
  border-top: 1px solid var(--line);
  transition: background 0.18s var(--ease), padding-left 0.18s var(--ease);
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  background: rgba(255, 107, 44, 0.1);
  padding-left: 16px;
}

.page-about .about-next__list .mono {
  grid-row: span 2;
  align-self: center;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-next__label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
}

.page-about .about-next__desc {
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-dual__compare {
    grid-template-columns: minmax(0, 1fr);
  }

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

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
    margin-top: 40px;
  }

  .page-about .about-hero__lane-state {
    flex: 0 0 auto;
    margin-left: auto;
    text-align: right;
  }

  .page-about .about-dual__compare {
    grid-template-columns: minmax(0, 1fr) 1px minmax(0, 1fr);
    gap: 0 24px;
    align-items: stretch;
  }

  .page-about .about-dual__spine {
    width: 1px;
    height: auto;
    background: linear-gradient(180deg, var(--orange), var(--teal));
  }

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

  .page-about .about-timeline__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-timeline__rail {
    position: sticky;
    top: 88px;
  }

  .page-about .about-network__body {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-trust__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-ecosystem__map {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    align-items: center;
    gap: 24px;
  }

  .page-about .about-ecosystem__ring {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-open__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-about .about-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-dual__fact,
  .page-about .about-timeline__node,
  .page-about .about-network__card,
  .page-about .about-next__list a {
    transition: none;
  }

  .page-about .about-dual__fact:hover,
  .page-about .about-timeline__node:hover,
  .page-about .about-network__card:hover {
    transform: none;
  }
}
<<<END>>>