.page-about {
  --about-gap: clamp(44px, 7vw, 96px);
  --about-panel-radius: var(--radius-lg);
}

.page-about .about-shell {
  padding-block: clamp(18px, 3vw, 30px) clamp(64px, 9vw, 120px);
}

.page-about .about-layout {
  margin-top: clamp(18px, 3vw, 34px);
}

.page-about .about-main > section {
  margin-top: var(--about-gap);
}

.page-about .about-main > section:first-child {
  margin-top: 0;
}

/* ---------- 章节头 ---------- */
.page-about .about-head {
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .about-head h2 {
  margin: 0.25em 0 0.45em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-head__note {
  margin: 0;
  max-width: 46ch;
  color: var(--silver);
  font-size: 0.95rem;
  line-height: 1.85;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding-top: clamp(10px, 2vw, 26px);
}

.page-about .about-hero h1 {
  margin: 0.16em 0 0.4em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.6rem, 8.4vw, 5.4rem);
  line-height: 0.94;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero__lead {
  margin: 0 0 0.9em;
  max-width: 34em;
  font-size: clamp(1.02rem, 2.4vw, 1.28rem);
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-hero__text {
  margin: 0 0 1.6em;
  max-width: 36em;
  color: var(--silver);
  font-size: 0.96rem;
  line-height: 1.85;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding-top: 18px;
  border-top: 1px solid var(--steel-soft);
}

.page-about .about-hero__facts div {
  display: flex;
  flex-direction: column-reverse;
  gap: 6px;
  min-width: 0;
}

.page-about .about-hero__facts dt {
  color: var(--silver);
  font-size: 0.76rem;
  line-height: 1.4;
  letter-spacing: 0.02em;
}

.page-about .about-hero__facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 3.4vw, 1.75rem);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
    gap: clamp(34px, 4.4vw, 64px);
  }

  .page-about .about-hero__media {
    align-self: start;
    margin-top: clamp(0px, 2.6vw, 38px);
  }
}

/* ---------- 时间轴 ---------- */
.page-about .track {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .track::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 12px;
  bottom: 26px;
  border-left: 1px dashed var(--steel);
  opacity: 0.9;
}

.page-about .track__item {
  position: relative;
  padding: 0 0 clamp(28px, 4vw, 44px) 34px;
}

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

.page-about .track__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(40, 224, 200, 0.14);
}

.page-about .track__year {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.98rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .track__panel {
  border-radius: var(--about-panel-radius);
}

.page-about .track__panel h3 {
  margin: 0 0 0.55em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .track__panel p {
  margin: 0 0 0.95em;
  color: var(--silver);
  font-size: 0.95rem;
  line-height: 1.85;
}

.page-about .track__media {
  margin: 4px 0 1em;
}

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

.page-about .track__panel .track__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 0;
}

.page-about .track__foot a {
  color: var(--white);
  font-size: 0.86rem;
  text-decoration: none;
  border-bottom: 1px solid var(--steel);
  padding-bottom: 2px;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .track__foot a:hover,
.page-about .track__foot a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

@media (min-width: 900px) {
  .page-about .track::before {
    left: 119px;
  }

  .page-about .track__item {
    display: grid;
    grid-template-columns: 110px minmax(0, 1fr);
    gap: clamp(20px, 2.8vw, 36px);
    padding-left: 0;
  }

  .page-about .track__item::before {
    left: 112px;
    top: 12px;
  }

  .page-about .track__year {
    margin: 14px 0 0;
    text-align: right;
    padding-right: 4px;
  }
}

/* ---------- 团队 ---------- */
.page-about .team-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .team-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-radius: var(--about-panel-radius);
}

.page-about .team-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .team-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 2.6rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .team-card__num span {
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: 0.82rem;
  letter-spacing: 0;
  color: var(--silver);
}

.page-about .team-card p {
  margin: 0;
  color: var(--silver);
  font-size: 0.94rem;
  line-height: 1.85;
}

.page-about .team-card__list {
  margin: auto 0 0;
  padding: 12px 0 0;
  list-style: none;
  display: grid;
  gap: 6px;
  border-top: 1px solid var(--steel-soft);
}

.page-about .team-card__list li {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

@media (min-width: 820px) {
  .page-about .team-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: clamp(14px, 2vw, 22px);
  }

  .page-about .team-card--a {
    min-height: 380px;
  }

  .page-about .team-card--b {
    margin-top: 34px;
    min-height: 320px;
  }

  .page-about .team-card--c {
    margin-top: 14px;
    min-height: 350px;
  }
}

/* ---------- 维护流程 ---------- */
.page-about .about-flow__grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
}

.page-about .flow {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .flow__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2vw, 22px);
  align-items: start;
  padding-bottom: clamp(14px, 2vw, 20px);
  border-bottom: 1px solid var(--steel-soft);
}

.page-about .flow__step:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .flow__num {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 3vw, 2rem);
  line-height: 1;
  letter-spacing: 0.03em;
  color: var(--cyan);
  opacity: 0.9;
}

.page-about .flow__step h3 {
  margin: 0 0 0.45em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .flow__step p {
  margin: 0;
  color: var(--silver);
  font-size: 0.93rem;
  line-height: 1.85;
}

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

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

@media (min-width: 900px) {
  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: center;
  }
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-reach__grid {
  display: grid;
  gap: clamp(22px, 3vw, 44px);
}

.page-about .about-reach__big {
  margin: 0.08em 0 0.2em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(4rem, 12vw, 7rem);
  line-height: 0.85;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-reach__big span {
  margin-left: 4px;
  font-size: 0.38em;
  color: var(--cyan);
}

.page-about .about-reach__cap {
  margin: 0;
  max-width: 20ch;
  color: var(--silver);
  font-size: 0.84rem;
  line-height: 1.6;
}

.page-about .about-reach__text h2 {
  margin: 0 0 0.7em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.16;
  color: var(--white);
}

.page-about .about-reach__text p {
  margin: 0 0 1em;
  color: var(--silver);
  font-size: 0.95rem;
  line-height: 1.85;
}

.page-about .about-reach__list {
  margin: 1.4em 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
  border-top: 1px solid var(--steel-soft);
  padding-top: 16px;
}

.page-about .about-reach__list li {
  display: grid;
  gap: 2px;
  color: var(--text);
  font-size: 0.92rem;
  line-height: 1.75;
}

.page-about .about-reach__list span {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

@media (min-width: 860px) {
  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.62fr);
    align-items: start;
    gap: clamp(28px, 4.4vw, 68px);
  }
}

/* ---------- 合作与交流 ---------- */
.page-about .partners {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  border-top: 1px solid var(--steel-soft);
}

.page-about .partners li {
  display: grid;
  gap: 6px;
  padding: clamp(16px, 2.4vw, 24px) 0;
  border-bottom: 1px solid var(--steel-soft);
}

.page-about .partners h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .partners p {
  margin: 0;
  color: var(--silver);
  font-size: 0.94rem;
  line-height: 1.85;
  max-width: 64ch;
}

.page-about .partners a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid var(--steel);
}

.page-about .partners a:hover,
.page-about .partners a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--cyan);
}

@media (min-width: 760px) {
  .page-about .partners li {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: clamp(18px, 3vw, 34px);
    align-items: baseline;
  }
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(40px, 6vw, 84px);
  padding: clamp(24px, 4vw, 44px);
  display: grid;
  gap: 16px;
  border: 1px solid var(--steel);
  border-radius: var(--about-panel-radius);
  background:
    radial-gradient(120% 140% at 92% 8%, rgba(127, 233, 220, 0.16), transparent 58%),
    linear-gradient(135deg, rgba(18, 41, 74, 0.96), rgba(10, 26, 47, 0.94) 62%);
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.2vw, 2rem);
  line-height: 1.2;
  color: var(--white);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 54ch;
  color: var(--silver);
  font-size: 0.95rem;
  line-height: 1.85;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

/* ---------- 右侧索引 ---------- */
.page-about .about-toc {
  display: none;
}

.page-about .about-toc .eyebrow {
  margin: 0 0 12px;
}

.page-about .about-toc .toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
  border-left: 1px solid var(--steel-soft);
}

.page-about .about-toc a {
  display: block;
  margin-left: -1px;
  padding: 7px 0 7px 14px;
  border-left: 2px solid transparent;
  color: var(--silver);
  font-size: 0.84rem;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--white);
  border-left-color: var(--cyan);
}

@media (min-width: 1280px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 168px;
    gap: clamp(28px, 3.4vw, 52px);
    align-items: start;
  }

  .page-about .about-toc {
    display: block;
    position: sticky;
    top: calc(var(--bar-h) + 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc a,
  .page-about .track__foot a {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>