.page-about {
  --about-line: rgba(47, 227, 200, 0.34);
  --about-body: rgba(244, 247, 250, 0.84);
  --about-ink-soft: rgba(10, 22, 38, 0.78);
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0;
}

.page-about .eyebrow--dark {
  color: #0f6f63;
}

.page-about .about-h2 {
  margin: 12px 0 0;
  font-size: clamp(26px, 5.2vw, 44px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-h2--dark {
  color: var(--ink);
}

.page-about .about-h3 {
  margin: 0 0 16px;
  font-size: var(--fs-22);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-lead {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: var(--fs-18);
  line-height: 1.85;
  color: var(--dim);
}

.page-about .about-p {
  margin: 18px 0 0;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-block {
  padding: 56px 0;
}

.page-about .about-block--teal {
  background: var(--teal);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-block--sand {
  background: var(--sand);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 28px 0 48px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 92% -14%, rgba(124, 107, 255, 0.18), transparent 62%),
    radial-gradient(90% 80% at -6% 0%, rgba(47, 227, 200, 0.12), transparent 58%);
}

.page-about .breadcrumbs {
  margin-bottom: 26px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(32px, 8vw, 68px);
  line-height: 1.02;
  letter-spacing: -0.025em;
  font-weight: 900;
  color: var(--paper);
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 26px rgba(47, 227, 200, 0.35);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 33em;
  font-size: var(--fs-18);
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .hero-stats {
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  background: var(--slate);
  padding: 18px 20px;
}

.page-about .hero-stats__head {
  margin: 0 0 6px;
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .hero-stats__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .hero-stats__row:last-child {
  border-bottom: 0;
  padding-bottom: 4px;
}

.page-about .hero-stats__key {
  font-size: var(--fs-14);
  color: var(--mist);
}

.page-about .hero-stats__num {
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .hero-stats__num--sm {
  font-size: var(--fs-18);
}

.page-about .hero-stats__unit {
  font-size: var(--fs-12);
  margin-left: 2px;
  color: var(--mist);
}

/* ---------- 来历 ---------- */
.page-about .origin__grid {
  display: grid;
  gap: 32px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .origin__aside {
  border-top: 2px solid var(--violet);
  padding-top: 18px;
}

.page-about .origin__aside-title {
  margin: 0 0 14px;
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--violet);
}

.page-about .origin__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .origin__list li {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .origin__list li:last-child {
  border-bottom: 0;
}

.page-about .origin__year {
  font-size: var(--fs-14);
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-about .origin__desc {
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--dim);
}

.page-about .about-quote {
  margin: 40px 0 0;
  padding: 26px 22px;
  background: var(--sand);
  color: var(--ink);
  border-left: 6px solid var(--orange);
  font-size: var(--fs-22);
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: -0.01em;
}

/* ---------- 时间线 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--slate);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-timeline__figure {
  margin-top: 30px;
}

.page-about .tl {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
}

.page-about .tl__item {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 18px;
  padding-bottom: 28px;
}

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

.page-about .tl__gutter {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.page-about .tl__dot {
  flex: none;
  width: 12px;
  height: 12px;
  margin-top: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 227, 200, 0.14), 0 0 16px rgba(47, 227, 200, 0.6);
}

.page-about .tl__line {
  flex: 1;
  width: 1px;
  min-height: 28px;
  margin-top: 8px;
  background: linear-gradient(180deg, var(--about-line), rgba(47, 227, 200, 0.04));
}

.page-about .tl__item:last-child .tl__line {
  display: none;
}

.page-about .tl__meta {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
}

.page-about .tl__ver {
  font-family: var(--font-mono);
  font-size: var(--fs-36);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .tl__year {
  font-size: var(--fs-14);
  color: var(--mist);
  letter-spacing: 0.08em;
}

.page-about .tl__title {
  margin: 10px 0 0;
  font-size: var(--fs-22);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .tl__text {
  margin: 10px 0 0;
  max-width: 34em;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .tl__note {
  margin: 12px 0 0;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--mist);
  padding-left: 10px;
  border-left: 2px solid var(--line-strong);
}

.page-about .tl__item--now .tl__body {
  border: 1px solid var(--line-strong);
  background: rgba(22, 40, 61, 0.72);
  padding: 18px 16px;
  margin-top: -6px;
}

.page-about .tl__item--now .tl__dot {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 51, 0.16), 0 0 18px rgba(255, 122, 51, 0.6);
}

/* ---------- 结构剖面 ---------- */
.page-about .structure__grid {
  display: grid;
  gap: 32px;
  grid-template-columns: minmax(0, 1fr);
  margin-top: 34px;
}

.page-about .profile {
  border-left: 1px solid var(--about-line);
  padding-left: 20px;
}

.page-about .profile__row {
  padding: 0 0 26px;
  margin-bottom: 26px;
  border-bottom: 1px dashed var(--line);
}

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

.page-about .profile__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .profile__num {
  font-family: var(--font-mono);
  font-size: var(--fs-52);
  line-height: 0.95;
  letter-spacing: -0.04em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .profile__title {
  margin: 0;
  font-size: var(--fs-18);
  font-weight: 700;
  color: var(--paper);
}

.page-about .profile__text {
  margin: 12px 0 0;
  max-width: 30em;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .clusters {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.page-about .cluster {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 12px;
  font-size: var(--fs-14);
  color: var(--paper);
  background: var(--slate);
  border: 1px solid var(--line);
  border-left: 2px solid var(--violet);
  transition: border-left-color 180ms ease-out, background-color 180ms ease-out, transform 180ms ease-out;
}

.page-about .cluster__no {
  font-size: var(--fs-12);
  color: var(--mist);
}

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

.page-about .groups {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .marks {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .marks__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 12px;
  background: rgba(22, 40, 61, 0.6);
  border-left: 2px solid var(--amber);
}

.page-about .marks__k {
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--amber);
  min-width: 72px;
}

.page-about .marks__v {
  font-size: var(--fs-14);
  color: var(--paper);
}

.page-about .structure__figure {
  align-self: start;
}

/* ---------- 团队 ---------- */
.page-about .team-rail {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 82%;
  gap: 12px;
  margin-top: 32px;
  padding-bottom: 10px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .team-card {
  scroll-snap-align: start;
  background: var(--slate);
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  padding: 20px 18px;
}

.page-about .team-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-52);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .team-card__name {
  margin: 8px 0 0;
  font-size: var(--fs-18);
  font-weight: 700;
  color: var(--cyan);
}

.page-about .team-card__text {
  margin: 10px 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--dim);
}

.page-about .team__lower {
  display: grid;
  gap: 32px;
  grid-template-columns: minmax(0, 1fr);
  margin-top: 44px;
}

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

.page-about .accordion__item {
  border-bottom: 1px solid var(--line);
}

.page-about .accordion__heading {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-about .accordion__trigger {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 16px 0;
  background: none;
  border: 0;
  color: var(--paper);
  font-family: inherit;
  font-size: var(--fs-16);
  font-weight: 700;
  text-align: left;
  cursor: pointer;
}

.page-about .accordion__trigger:hover {
  color: var(--cyan);
}

.page-about .accordion__trigger:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-about .accordion__step {
  font-size: var(--fs-12);
  color: var(--orange);
  letter-spacing: 0.06em;
}

.page-about .accordion__label {
  flex: 1;
}

.page-about .accordion__icon {
  flex: none;
  width: 12px;
  height: 12px;
  position: relative;
  transition: transform 200ms ease-out;
}

.page-about .accordion__icon::before,
.page-about .accordion__icon::after {
  content: "";
  position: absolute;
  background: var(--cyan);
}

.page-about .accordion__icon::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 2px;
}

.page-about .accordion__icon::after {
  left: 5px;
  top: 0;
  width: 2px;
  height: 12px;
}

.page-about .accordion__trigger[aria-expanded="true"] .accordion__icon {
  transform: rotate(135deg);
}

.page-about .accordion__panel {
  padding: 0 0 18px;
}

.page-about .accordion__panel p {
  margin: 0;
  max-width: 34em;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--dim);
}

.page-about .accordion__panel a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .team__figure {
  align-self: start;
}

/* ---------- 本地与下一步 ---------- */
.page-about .next__grid {
  display: grid;
  gap: 30px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .next__text {
  margin: 16px 0 0;
  max-width: 33em;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--about-ink-soft);
}

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

.page-about .next__btn {
  border-color: rgba(10, 22, 38, 0.42);
  color: var(--ink);
}

.page-about .next__btn:hover {
  border-color: var(--ink);
  background: rgba(10, 22, 38, 0.08);
}

.page-about .next__links {
  border-top: 2px solid var(--ink);
  padding-top: 16px;
}

.page-about .next__links-title {
  margin: 0 0 12px;
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: rgba(10, 22, 38, 0.6);
}

.page-about .next__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .next__list li {
  border-bottom: 1px solid rgba(10, 22, 38, 0.16);
}

.page-about .next__list li:last-child {
  border-bottom: 0;
}

.page-about .next__list a {
  display: block;
  padding: 12px 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .next__list a:hover {
  color: #0b5f57;
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .clusters {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .team-rail {
    grid-auto-columns: 48%;
  }

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

  .page-about .marks__item {
    flex-direction: column;
    gap: 4px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 34px 0 64px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-block {
    padding: 84px 0;
  }

  .page-about .origin__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: 48px;
  }

  .page-about .origin__aside {
    border-top: 0;
    border-left: 1px solid var(--line);
    border-top: 2px solid var(--violet);
    padding: 18px 0 0 22px;
  }

  .page-about .about-quote {
    margin-top: 48px;
    padding: 34px 32px;
    font-size: var(--fs-28);
  }

  .page-about .tl {
    margin-top: 48px;
  }

  .page-about .tl__item {
    grid-template-columns: 24px minmax(0, 1fr) 200px;
    gap: 26px;
    padding-bottom: 36px;
  }

  .page-about .tl__note {
    grid-column: 3;
    grid-row: 1;
    align-self: start;
    margin-top: 12px;
    border-left: 0;
    border-top: 1px solid var(--line-strong);
    padding: 8px 0 0;
  }

  .page-about .tl__ver {
    font-size: var(--fs-52);
  }

  .page-about .tl__body {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .tl__gutter {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .structure__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .profile__num {
    font-size: var(--fs-80);
  }

  .page-about .team-rail {
    grid-auto-flow: row;
    grid-auto-columns: auto;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    overflow: visible;
  }

  .page-about .team__lower {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .next__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: 48px;
    align-items: start;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__title {
    font-size: var(--fs-80);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .cluster,
  .page-about .accordion__icon {
    transition: none;
  }

  .page-about .cluster:hover,
  .page-about .cluster:focus-within {
    transform: none;
  }
}
<<<END>>>