.page-about {
  --about-sec-gap: clamp(48px, 8vw, 88px);
  --about-num: clamp(52px, 11vw, 96px);
  background: var(--ink-950);
  color: var(--text);
  overflow-x: clip;
}

.page-about .about-crumbs {
  padding-top: 22px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(760px 380px at 88% -10%, rgba(47, 243, 208, 0.12), transparent 62%),
    radial-gradient(620px 340px at -6% 22%, rgba(76, 141, 255, 0.10), transparent 60%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
  padding-top: 28px;
  padding-bottom: clamp(48px, 8vw, 84px);
}

.page-about .about-hero__copy h1 {
  margin: 14px 0 18px;
  font-size: clamp(38px, 6.6vw, 78px);
  font-weight: 900;
  line-height: 1.03;
  letter-spacing: -0.025em;
  color: var(--text);
}

.page-about .about-hero__copy .lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.8;
  color: var(--text-2);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 22px;
  margin-top: 32px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__stat {
  display: grid;
  gap: 6px;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(23px, 3vw, 31px);
  line-height: 1;
  color: var(--text);
}

.page-about .about-hero__num small {
  font-size: 0.48em;
  font-weight: 600;
  color: var(--cyan);
  margin-left: 3px;
}

.page-about .about-hero__label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-3);
}

.page-about .about-hero__figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel-800);
  box-shadow: 0 30px 70px -50px rgba(47, 243, 208, 0.55);
}

.page-about .about-hero__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.05);
}

/* ---------- 主体与右栏索引 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 0;
  padding-top: clamp(36px, 6vw, 64px);
  padding-bottom: clamp(48px, 8vw, 88px);
}

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

.page-about .about-toc__inner {
  position: sticky;
  top: 104px;
  border-left: 1px solid var(--line);
  padding-left: 20px;
}

.page-about .about-toc__label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-3);
}

.page-about .about-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  font-size: 13px;
  color: var(--text-2);
  text-decoration: none;
  line-height: 1.4;
  transition: color 0.24s var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--cyan);
}

.page-about .about-toc__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-3);
  transition: color 0.24s var(--ease);
}

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

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  position: relative;
  border-top: 1px solid var(--line);
  padding: var(--about-sec-gap) 0;
}

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

.page-about .about-section__num {
  position: absolute;
  top: clamp(38px, 6vw, 66px);
  right: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--about-num);
  line-height: 0.82;
  letter-spacing: -0.04em;
  color: rgba(47, 243, 208, 0.10);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.page-about .about-main > .about-section:first-child .about-section__num {
  top: clamp(4px, 1vw, 14px);
}

.page-about .about-section__head {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 12px;
  max-width: 40ch;
  margin-bottom: clamp(26px, 4vw, 42px);
}

.page-about .about-section__head h2 {
  margin: 0;
  font-size: clamp(25px, 3.4vw, 38px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-section__lede {
  position: relative;
  z-index: 1;
  max-width: 60ch;
  margin: -14px 0 clamp(24px, 3.6vw, 38px);
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-2);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--blue) 55%, var(--orange));
  opacity: 0.55;
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(28px, 4vw, 42px);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-950);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 3px rgba(47, 243, 208, 0.1);
  transition: background 0.32s var(--ease), box-shadow 0.32s var(--ease);
}

.page-about .about-timeline__item.is-in::before {
  background: var(--cyan);
  box-shadow: 0 0 14px rgba(47, 243, 208, 0.7);
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: 7px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-timeline__item h3 {
  margin: 0 0 8px;
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-timeline__item p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-2);
}

/* ---------- 四条业务线 ---------- */
.page-about .about-cap-grid {
  display: grid;
  gap: 14px;
}

.page-about .about-cap {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(165deg, rgba(17, 27, 54, 0.9), rgba(10, 16, 36, 0.92));
  padding: clamp(19px, 3vw, 26px);
  transition: border-color 0.28s var(--ease), transform 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.page-about .about-cap::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--grad-field);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}

.page-about .about-cap:hover,
.page-about .about-cap:focus-visible,
.page-about .about-cap:focus-within {
  border-color: rgba(47, 243, 208, 0.48);
  transform: translateY(-4px);
  box-shadow: 0 22px 46px -34px rgba(47, 243, 208, 0.6);
  outline: none;
}

.page-about .about-cap:hover::after,
.page-about .about-cap:focus-within::after {
  opacity: 1;
}

.page-about .about-cap__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--text-3);
}

.page-about .about-cap h3 {
  margin: 11px 0 12px;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-cap p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--text-2);
}

.page-about .about-cap__note {
  max-height: 0;
  margin-top: 0;
  padding-top: 0;
  overflow: hidden;
  opacity: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  line-height: 1.6;
  color: var(--cyan);
  border-top: 1px dashed rgba(47, 243, 208, 0.3);
  transition: max-height 0.34s var(--ease), opacity 0.26s var(--ease),
    margin-top 0.34s var(--ease), padding-top 0.34s var(--ease);
}

.page-about .about-cap:hover .about-cap__note,
.page-about .about-cap:focus-within .about-cap__note {
  max-height: 96px;
  margin-top: 14px;
  padding-top: 12px;
  opacity: 1;
}

/* ---------- 数据来路 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 1px;
  margin: 0 0 clamp(26px, 4vw, 42px);
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-steps__item {
  background: var(--ink-900);
  padding: clamp(19px, 2.6vw, 26px);
}

.page-about .about-steps__idx {
  display: inline-block;
  margin-bottom: 10px;
  padding: 2px 8px;
  border: 1px solid rgba(76, 141, 255, 0.4);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--blue);
}

.page-about .about-steps__item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-steps__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--text-2);
}

.page-about .about-data__split {
  display: grid;
  gap: 24px;
}

.page-about .about-data__split .figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel-800);
}

.page-about .about-data__split .figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-data__facts p {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-2);
}

.page-about .about-facts {
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-facts li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 13px 0;
  background: var(--ink-950);
}

.page-about .about-facts__num {
  min-width: 62px;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  color: var(--orange);
  line-height: 1;
}

.page-about .about-facts__label {
  font-size: 13.5px;
  color: var(--text-2);
}

.page-about .about-data__tail {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-3);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 28px;
}

.page-about .about-team .figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel-800);
}

.page-about .about-team .figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-team__body p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-2);
}

.page-about .about-team__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 26px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-team__stats li {
  display: grid;
  gap: 6px;
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-team__num small {
  font-size: 0.5em;
  margin-left: 1px;
}

.page-about .about-team__label {
  font-size: 11.5px;
  letter-spacing: 0.08em;
  line-height: 1.5;
  color: var(--text-3);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 14px;
}

.page-about .about-partner {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(158deg, rgba(17, 27, 54, 0.74), rgba(10, 16, 36, 0.6));
  backdrop-filter: blur(7px);
  padding: clamp(20px, 2.8vw, 26px);
  transition: border-color 0.28s var(--ease), transform 0.28s var(--ease);
}

.page-about .about-partner:hover {
  border-color: rgba(76, 141, 255, 0.5);
  transform: translateY(-3px);
}

.page-about .about-partner h3 {
  margin: 14px 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--text-2);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  position: relative;
  border-top: 1px solid var(--line);
  background:
    radial-gradient(620px 320px at 90% 10%, rgba(255, 90, 31, 0.18), transparent 65%),
    linear-gradient(102deg, rgba(255, 90, 31, 0.16), rgba(76, 141, 255, 0.1) 52%, rgba(47, 243, 208, 0.1));
  overflow: hidden;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--grad-field);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 34px;
  padding-top: clamp(46px, 8vw, 84px);
  padding-bottom: clamp(46px, 8vw, 84px);
}

.page-about .about-cta__copy h2 {
  margin: 14px 0 16px;
  font-size: clamp(26px, 4vw, 44px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.022em;
  color: var(--text);
}

.page-about .about-cta__copy p {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-2);
}

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

.page-about .about-cta__aside {
  border-top: 1px solid var(--line);
  padding-top: 22px;
}

.page-about .about-cta__aside-label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-3);
}

.page-about .about-cta__links {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-cta__links a {
  display: block;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-cap-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

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

  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
    gap: 56px;
    padding-top: 36px;
  }

  .page-about .about-data__split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 38px;
    align-items: center;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 52px;
    align-items: center;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: end;
    gap: 60px;
  }

  .page-about .about-cta__aside {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding-top: 0;
    padding-left: 28px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) 208px;
    gap: 72px;
  }

  .page-about .about-toc {
    display: block;
  }
}

@media (max-width: 400px) {
  .page-about .about-team__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (hover: none) {
  .page-about .about-cap__note {
    max-height: 96px;
    margin-top: 14px;
    padding-top: 12px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cap,
  .page-about .about-partner,
  .page-about .about-toc__link,
  .page-about .about-cta__links a,
  .page-about .about-timeline__item::before {
    transition: none;
  }

  .page-about .about-cap:hover,
  .page-about .about-partner:hover {
    transform: none;
  }
}
<<<END>>>