.page-about {
  padding-bottom: clamp(64px, 9vw, 120px);
  color: var(--c-text);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-block: clamp(24px, 4vw, 40px) clamp(44px, 7vw, 80px);
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: clamp(26px, 5vw, 52px);
}

.page-about .about-hero__aside {
  display: none;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--c-accent);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6vw, 62px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 16em;
}

.page-about .about-hero__lead {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 38em;
  font-size: clamp(16px, 1.4vw, 17px);
  line-height: 1.82;
  color: var(--c-muted);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 1px;
  list-style: none;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-radius: var(--r-soft);
  overflow: hidden;
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--c-surface);
}

.page-about .about-stats__num {
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  line-height: 1.1;
}

.page-about .about-stats__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-muted);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-sec {
  padding-top: clamp(56px, 8vw, 104px);
}

.page-about .about-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding-bottom: 18px;
  margin-bottom: clamp(28px, 4vw, 46px);
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-head__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-accent);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  max-width: 20em;
}

.page-about .about-head__desc {
  margin: 12px 0 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--c-muted);
}

/* ---------- 起点 ---------- */

.page-about .about-start {
  max-width: 44em;
}

.page-about .about-start p {
  margin: 0 0 18px;
  font-size: 16.5px;
  line-height: 1.85;
}

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

.page-about .about-start p:first-child::first-letter {
  font-size: 1.05em;
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline__visual {
  margin: 0 0 clamp(28px, 4vw, 44px);
  border-radius: var(--r-card);
  overflow: hidden;
}

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

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 24px;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 18px;
  bottom: 18px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-accent) 0%, var(--c-line) 45%, rgba(30, 43, 77, 0.2) 100%);
}

.page-about .tl-node {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 20px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-card);
  background: var(--c-surface);
  transition: border-color var(--t-base), transform var(--t-base);
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 28px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-bg);
  border: 2px solid var(--c-line);
  transition: border-color var(--t-base), background var(--t-base);
}

.page-about .tl-node:hover,
.page-about .tl-node:focus-within {
  border-color: var(--c-accent);
  transform: translateY(-2px);
}

.page-about .tl-node:hover::before,
.page-about .tl-node:focus-within::before {
  border-color: var(--c-accent);
  background: var(--c-accent);
}

.page-about .tl-node__meta {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .tl-node__year {
  font-size: 18px;
  font-weight: 700;
}

.page-about .tl-node__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.page-about .tl-node__desc {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .tl-node__more {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--t-base);
}

.page-about .tl-node__more > div {
  overflow: hidden;
}

.page-about .tl-node__more p {
  margin: 0;
  padding-top: 12px;
  margin-top: 12px;
  border-top: 1px dashed var(--c-line);
  max-width: 42em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-accent-soft);
}

.page-about .tl-node:hover .tl-node__more,
.page-about .tl-node:focus-within .tl-node__more {
  grid-template-rows: 1fr;
}

/* ---------- 团队 ---------- */

.page-about .about-team__visual {
  margin: 0 0 clamp(26px, 4vw, 40px);
  border-radius: var(--r-card);
  overflow: hidden;
}

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

.page-about .team-switch {
  position: relative;
}

.page-about .team-switch__input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

.page-about .team-switch__rail {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.page-about .team-switch__tab {
  display: inline-block;
  padding: 9px 18px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  font-size: 14px;
  color: var(--c-text);
  background: transparent;
  cursor: pointer;
  user-select: none;
  transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast), transform var(--t-fast);
}

.page-about .team-switch__tab:hover {
  border-color: var(--c-accent);
  transform: translateY(-2px);
}

.page-about #tab-content:checked ~ .team-switch__rail .team-switch__tab--content,
.page-about #tab-tech:checked ~ .team-switch__rail .team-switch__tab--tech,
.page-about #tab-risk:checked ~ .team-switch__rail .team-switch__tab--risk,
.page-about #tab-service:checked ~ .team-switch__rail .team-switch__tab--service {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-bg);
  font-weight: 700;
}

.page-about #tab-content:focus-visible ~ .team-switch__rail .team-switch__tab--content,
.page-about #tab-tech:focus-visible ~ .team-switch__rail .team-switch__tab--tech,
.page-about #tab-risk:focus-visible ~ .team-switch__rail .team-switch__tab--risk,
.page-about #tab-service:focus-visible ~ .team-switch__rail .team-switch__tab--service {
  outline: 2px solid var(--c-accent-soft);
  outline-offset: 3px;
}

.page-about .team-panel {
  display: none;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--c-line);
  border-radius: var(--r-card);
  background: var(--c-surface);
}

.page-about #tab-content:checked ~ .team-switch__panels .team-panel--content,
.page-about #tab-tech:checked ~ .team-switch__panels .team-panel--tech,
.page-about #tab-risk:checked ~ .team-switch__panels .team-panel--risk,
.page-about #tab-service:checked ~ .team-switch__panels .team-panel--service {
  display: block;
}

.page-about .team-panel__lead {
  margin: 0 0 20px;
  padding-left: 14px;
  border-left: 2px solid var(--c-accent);
  font-size: 16.5px;
  line-height: 1.72;
}

.page-about .team-panel__facts {
  display: grid;
  gap: 1px;
  margin: 0;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-radius: var(--r-soft);
  overflow: hidden;
}

.page-about .team-panel__facts > div {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  background: var(--c-bg);
}

.page-about .team-panel__facts dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-data);
}

.page-about .team-panel__facts dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .about-team__rhythm {
  margin-top: clamp(24px, 4vw, 36px);
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--c-line);
  border-radius: var(--r-card);
  background: linear-gradient(135deg, rgba(34, 224, 214, 0.07), transparent 62%);
}

.page-about .about-team__rhythm-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.01em;
}

.page-about .about-team__rhythm p {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-muted);
}

/* ---------- 伙伴 ---------- */

.page-about .about-network {
  align-items: start;
}

.page-about .about-flow {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-radius: var(--r-card);
  overflow: hidden;
}

.page-about .about-flow__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 16px;
  background: var(--c-surface);
  transition: background var(--t-fast);
}

.page-about .about-flow__item:hover {
  background: var(--c-bg);
}

.page-about .about-flow__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  padding-top: 4px;
}

.page-about .about-flow__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16.5px;
  line-height: 1.4;
}

.page-about .about-flow__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .about-network__visual {
  display: grid;
  gap: 18px;
}

.page-about .about-net {
  width: 100%;
  max-width: 300px;
  height: auto;
  color: var(--c-accent);
}

.page-about .about-net__edges {
  stroke: currentColor;
  stroke-width: 0.9;
  opacity: 0.4;
}

.page-about .about-net__dots {
  fill: var(--c-line);
}

.page-about .about-net__hub {
  fill: var(--c-accent);
}

.page-about .about-network__visual .media-frame {
  border-radius: var(--r-card);
  overflow: hidden;
}

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

/* ---------- 服务覆盖 ---------- */

.page-about .about-reach {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-radius: var(--r-card);
  overflow: hidden;
}

.page-about .about-reach__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px;
  background: var(--c-surface);
}

.page-about .about-reach__num {
  font-size: clamp(30px, 5vw, 42px);
  font-weight: 700;
  line-height: 1;
}

.page-about .about-reach__label {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--c-muted);
}

.page-about .about-reach__meta {
  margin-top: clamp(20px, 3vw, 30px);
  max-width: 52em;
}

.page-about .about-reach__meta p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--c-muted);
}

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

.page-about .about-reach__meta a {
  color: var(--c-accent);
  border-bottom: 1px solid rgba(34, 224, 214, 0.35);
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-about .about-reach__meta a:hover {
  color: var(--c-accent-soft);
  border-color: var(--c-accent-soft);
}

.page-about .about-reach__links {
  color: var(--c-text) !important;
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: 68px minmax(0, 1fr);
    gap: 36px;
  }

  .page-about .about-hero__aside {
    display: block;
    padding-top: 6px;
  }

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

  .page-about .about-head {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .about-head__idx {
    padding-top: 9px;
  }

  .page-about .about-timeline {
    padding-left: 30px;
  }

  .page-about .tl-node {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 26px;
    padding: 24px 26px;
  }

  .page-about .tl-node::before {
    left: -31px;
    top: 32px;
  }

  .page-about .tl-node__meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .page-about .about-network__visual {
    gap: 22px;
    justify-items: end;
  }

  .page-about .about-net {
    max-width: 260px;
  }

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

@media (min-width: 1080px) {
  .page-about .about-flow__item {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 18px;
    padding: 22px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node,
  .page-about .tl-node::before,
  .page-about .tl-node__more,
  .page-about .team-switch__tab,
  .page-about .about-flow__item {
    transition: none;
  }

  .page-about .tl-node:hover,
  .page-about .tl-node:focus-within,
  .page-about .team-switch__tab:hover {
    transform: none;
  }
}
<<<END>>>