.page-about {
  --about-line: 1px solid rgba(185, 194, 207, .16);
  --about-line-soft: 1px solid rgba(185, 194, 207, .1);
  --about-body: rgba(232, 239, 247, .84);
  background-color: var(--ink-900);
  color: var(--text-light);
  font-family: var(--font-ui);
  padding-top: var(--header-h);
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
}

.page-about a {
  color: inherit;
}

.page-about .about-mono {
  font-family: var(--font-mono);
  letter-spacing: .04em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(2.4rem, 6vw, 4.5rem);
  border-bottom: var(--about-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: 2;
  top: -18%;
  right: -12%;
  width: min(820px, 92%);
  height: 150%;
  background: linear-gradient(158deg, rgba(51, 225, 218, .17), rgba(226, 61, 142, .11) 52%, transparent 76%);
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: 1;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 11, 26, .58) 0%, rgba(6, 11, 26, .82) 52%, var(--ink-900) 100%);
  pointer-events: none;
}

.page-about .about-hero__media {
  position: absolute;
  z-index: 0;
  inset: 0;
  margin: 0;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: .42;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 3;
  display: grid;
  gap: clamp(2rem, 5vw, 3.4rem);
}

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  margin: 0 0 1.6rem;
  padding: 0;
  list-style: none;
  font-size: .8rem;
  color: var(--grey-300);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.6vw, 3.9rem);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: .01em;
  margin-top: .8rem;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--cyan-400);
  border-bottom: 2px solid rgba(226, 61, 142, .6);
  padding-bottom: .04em;
}

.page-about .about-hero__lede {
  margin: 1.15rem 0 0;
  max-width: 46ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.6rem;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: rgba(185, 194, 207, .16);
  border: var(--about-line);
}

.page-about .about-facts__item {
  background: rgba(12, 22, 48, .82);
  padding: 1rem 1.05rem;
}

.page-about .about-facts__item dt {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--grey-300);
}

.page-about .about-facts__num {
  margin: .4rem 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 4.4vw, 1.85rem);
  line-height: 1.1;
  color: var(--cyan-400);
}

.page-about .about-facts__num small {
  font-family: var(--font-ui);
  font-size: .72rem;
  color: var(--grey-300);
  margin-left: .3rem;
  letter-spacing: .04em;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding-block: clamp(2.6rem, 7vw, 5.2rem);
  border-bottom: var(--about-line-soft);
}

.page-about .about-head {
  max-width: 60ch;
  margin-bottom: clamp(1.8rem, 4vw, 2.8rem);
}

.page-about .about-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 4.4vw, 2.4rem);
  line-height: 1.24;
  margin-top: .7rem;
}

.page-about .about-head__lede {
  margin: .85rem 0 0;
  font-size: .97rem;
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  display: grid;
  gap: 1.4rem;
}

.page-about .about-origin__head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 4.4vw, 2.4rem);
  line-height: 1.24;
  margin-top: .7rem;
  color: var(--text-dark);
}

.page-about .about-origin__link {
  margin: 1.6rem 0 0;
}

.page-about .about-origin__link .btn {
  color: var(--text-dark);
  border-color: rgba(16, 24, 42, .28);
}

.page-about .about-origin-section {
  background-color: var(--paper-100);
  color: var(--text-dark);
}

.page-about .about-origin-section .eyebrow {
  color: var(--clay-500);
}

.page-about .about-origin-section .prose--paper p {
  color: rgba(16, 24, 42, .86);
}

/* ---------- 版本线 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0.5rem;
  top: .7rem;
  bottom: .7rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan-400) 0%, rgba(51, 225, 218, .14) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 1.7rem 2.15rem;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0.5rem;
  top: .5rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  transform: translateX(-50%);
  background: var(--ink-900);
  border: 1.5px solid var(--cyan-400);
  transition: background-color .28s ease, box-shadow .28s ease;
}

.page-about .timeline__item:hover::before,
.page-about .timeline__item:focus-within::before {
  background: var(--cyan-400);
  box-shadow: 0 0 0 4px rgba(51, 225, 218, .14);
}

.page-about .timeline__ver {
  display: block;
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .12em;
  color: var(--cyan-200);
  margin-bottom: .3rem;
}

.page-about .timeline__title {
  font-family: var(--font-ui);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--text-light);
}

.page-about .timeline__desc {
  margin: .4rem 0 0;
  font-size: .94rem;
  line-height: 1.75;
  color: var(--about-body);
}

.page-about .about-shot {
  margin: clamp(2rem, 5vw, 3rem) 0 0;
}

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

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(1.8rem, 4vw, 2.6rem);
}

.page-about .about-team__intro h2 {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 4.4vw, 2.4rem);
  line-height: 1.24;
  margin-top: .7rem;
}

.page-about .about-team__lede {
  margin: .9rem 0 0;
  font-size: .97rem;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-team__figure {
  margin: 1.6rem 0 0;
  border: var(--about-line);
  overflow: hidden;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.92) contrast(1.04);
}

.page-about .about-team__cards {
  display: grid;
  gap: .9rem;
}

.page-about .team-card {
  --accent: var(--cyan-400);
  border: var(--about-line);
  border-left: 2px solid var(--accent);
  background: linear-gradient(180deg, rgba(12, 22, 48, .92), rgba(12, 22, 48, .58));
  padding: .95rem 1.05rem 1.05rem;
  transition: transform .3s ease, border-color .3s ease, background-color .3s ease;
}

.page-about .team-card:hover {
  transform: translateY(-2px);
  border-color: rgba(51, 225, 218, .42);
  border-left-color: var(--accent);
}

.page-about .team-card--build { --accent: var(--moss-soft); }
.page-about .team-card--care { --accent: var(--clay-500); }
.page-about .team-card--safety { --accent: var(--grey-300); }

.page-about .team-card__head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: .55rem .8rem;
  cursor: pointer;
  list-style: none;
  padding: .15rem 0;
}

.page-about .team-card__head::-webkit-details-marker {
  display: none;
}

.page-about .team-card__num {
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 4.2vw, 1.95rem);
  line-height: 1;
  color: var(--accent);
}

.page-about .team-card__role {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: .05em;
}

.page-about .team-card__sign {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--grey-300);
  transition: transform .28s ease, color .28s ease;
}

.page-about .team-card[open] .team-card__sign {
  transform: rotate(45deg);
  color: var(--cyan-400);
}

.page-about .team-card__body {
  padding-top: .55rem;
  border-top: var(--about-line-soft);
  margin-top: .7rem;
}

.page-about .team-card__body p {
  margin: .55rem 0 0;
  font-size: .92rem;
  line-height: 1.78;
  color: rgba(232, 239, 247, .8);
}

/* ---------- 覆盖 ---------- */
.page-about .about-reach {
  display: grid;
  gap: clamp(1.7rem, 4vw, 2.6rem);
}

.page-about .about-reach__panel {
  border: var(--about-line);
  background:
    radial-gradient(circle at 78% 12%, rgba(51, 225, 218, .12), transparent 58%),
    rgba(12, 22, 48, .6);
  padding: 1rem;
}

.page-about .about-reach__map {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-reach__caption {
  margin: .8rem 0 0;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .04em;
  color: var(--grey-300);
}

.page-about .about-reach__text h2 {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 4.4vw, 2.4rem);
  line-height: 1.24;
  margin-top: .7rem;
}

.page-about .about-reach__lede {
  margin: .9rem 0 0;
  font-size: .97rem;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .reach-list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: var(--about-line);
}

.page-about .reach-list__item {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  align-items: baseline;
  gap: .8rem;
  padding: .85rem 0;
  border-bottom: var(--about-line-soft);
}

.page-about .reach-list__num {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--amber-400);
  letter-spacing: .02em;
}

.page-about .reach-list__num small {
  font-family: var(--font-ui);
  font-size: .72rem;
  color: var(--grey-300);
  margin-left: .2rem;
}

.page-about .reach-list__label {
  font-size: .9rem;
  line-height: 1.65;
  color: var(--about-body);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco-section {
  background-color: var(--paper-100);
  color: var(--text-dark);
}

.page-about .about-eco-section .eyebrow {
  color: var(--clay-500);
}

.page-about .about-eco__head {
  max-width: 58ch;
  margin-bottom: clamp(1.8rem, 4vw, 2.6rem);
}

.page-about .about-eco__head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 4.4vw, 2.4rem);
  line-height: 1.26;
  margin-top: .7rem;
}

.page-about .about-eco__head p {
  margin: .85rem 0 0;
  font-size: .97rem;
  line-height: 1.8;
  color: rgba(16, 24, 42, .8);
}

.page-about .eco-list {
  display: grid;
  gap: 1px;
  background: rgba(16, 24, 42, .14);
  border: 1px solid rgba(16, 24, 42, .14);
}

.page-about .eco-item {
  background: var(--paper-100);
  padding: 1.4rem 1.2rem 1.5rem;
  transition: background-color .3s ease;
}

.page-about .eco-item:hover {
  background: #efeade;
}

.page-about .eco-item__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 5.4vw, 2.5rem);
  line-height: 1;
  color: var(--moss-500);
}

.page-about .eco-item__title {
  margin-top: .7rem;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--text-dark);
}

.page-about .eco-item p {
  margin: .55rem 0 0;
  font-size: .92rem;
  line-height: 1.78;
  color: rgba(16, 24, 42, .78);
}

/* ---------- 安全 ---------- */
.page-about .about-safety {
  display: grid;
  gap: clamp(1.7rem, 4vw, 2.6rem);
}

.page-about .about-safety__text h2 {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 4.4vw, 2.4rem);
  line-height: 1.24;
  margin-top: .7rem;
}

.page-about .about-safety__text p {
  margin: .9rem 0 0;
  font-size: .96rem;
  line-height: 1.82;
  color: var(--about-body);
  max-width: 58ch;
}

.page-about .about-safety__link {
  margin-top: 1.4rem;
}

.page-about .safety-marks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(185, 194, 207, .16);
  border: var(--about-line);
  align-content: start;
}

.page-about .safety-marks__item {
  background: rgba(12, 22, 48, .84);
  padding: .9rem 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: .4rem 1rem;
}

.page-about .safety-marks__key {
  font-size: .82rem;
  color: var(--grey-300);
  letter-spacing: .04em;
}

.page-about .safety-marks__val {
  font-family: var(--font-mono);
  font-size: .95rem;
  color: var(--cyan-200);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-block: clamp(2.4rem, 6vw, 4rem) clamp(1.6rem, 4vw, 2.4rem);
  background:
    radial-gradient(circle at 88% 0%, rgba(226, 61, 142, .16), transparent 52%),
    var(--ink-800);
  border-top: var(--about-line);
}

.page-about .about-next__inner {
  display: grid;
  gap: 1.5rem;
}

.page-about .about-next__text h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.2vw, 2.15rem);
  line-height: 1.26;
  margin-top: .7rem;
}

.page-about .about-next__text p {
  margin: .8rem 0 0;
  max-width: 52ch;
  font-size: .95rem;
  line-height: 1.78;
  color: var(--about-body);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  align-content: start;
}

.page-about .about-endnote {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .5rem 1.5rem;
  margin-top: clamp(2rem, 5vw, 3rem);
  padding-top: 1.1rem;
  border-top: var(--about-line-soft);
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .04em;
  color: var(--grey-300);
}

.page-about .about-endnote p {
  margin: 0;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .team-card--safety {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

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

  .page-about .about-origin {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(2rem, 5vw, 4.5rem);
    align-items: start;
  }

  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 5.5rem minmax(0, 1fr);
    column-gap: 1.6rem;
    align-items: start;
    padding-bottom: 2rem;
  }

  .page-about .timeline__ver {
    margin-bottom: 0;
    padding-top: .16rem;
  }

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

  .page-about .about-team__cards {
    grid-template-columns: minmax(0, 1fr);
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
  }

  .page-about .team-card--safety {
    grid-column: auto;
  }

  .page-about .about-reach {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
    gap: clamp(2rem, 5vw, 3.6rem);
  }

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

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .about-next__actions {
    justify-content: flex-end;
  }

  .page-about .about-shot {
    margin-left: auto;
    margin-right: 0;
    width: min(100%, 860px);
  }
}

@media (min-width: 1024px) {
  .page-about {
    padding-left: var(--rail-w);
  }

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

  .page-about .team-card {
    padding: 1.15rem 1.3rem 1.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .team-card__sign,
  .page-about .timeline__item::before {
    transition: opacity .2s ease;
    transform: none;
  }

  .page-about .team-card:hover {
    transform: none;
  }
}
<<<END>>>