.page-about {
  --about-radius: clamp(20px, 3vw, 34px);
  --about-num: var(--font-mono);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.35rem, 3.5vw, 2.25rem) 0 clamp(2.75rem, 7vw, 6rem);
  background:
    radial-gradient(115% 85% at 88% -10%, rgba(59, 42, 107, .62) 0%, transparent 60%),
    radial-gradient(90% 70% at 0% 110%, rgba(47, 243, 208, .10) 0%, transparent 62%),
    linear-gradient(175deg, var(--deep-sea) 0%, var(--ink) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan-30) 22%, var(--sand-40) 70%, transparent);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.9rem, 5vw, 3.4rem);
  margin-top: clamp(1.4rem, 4vw, 2.75rem);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.35rem, 8.2vw, 5.2rem);
  line-height: 1.02;
  letter-spacing: -.015em;
  margin: .55rem 0 1.15rem;
  color: var(--mist);
}

.page-about .about-hero__lede {
  max-width: 34em;
  color: var(--mist-86);
}

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

.page-about .about-hero__aside {
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
  padding: clamp(1.1rem, 3vw, 1.7rem);
  border: 1px solid var(--mist-10);
  border-radius: var(--about-radius);
  background: linear-gradient(160deg, rgba(4, 24, 31, .92), rgba(6, 42, 51, .72));
  box-shadow: var(--shadow-lift);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-hero__facts li {
  display: grid;
  gap: .2rem;
  padding-bottom: .9rem;
  border-bottom: 1px dashed var(--mist-16);
}

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

.page-about .about-hero__num {
  font-family: var(--about-num);
  font-size: clamp(1.5rem, 4.4vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-hero__label {
  font-size: .88rem;
  line-height: 1.55;
  color: var(--mist-64);
}

.page-about .about-hero .vertical-note {
  color: var(--sand);
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-origin__media {
  margin: 0;
  border: 1px solid var(--mist-10);
}

.page-about .about-origin__body {
  max-width: 62ch;
}

.page-about .about-origin__prose p {
  color: var(--mist-86);
}

.page-about .about-origin .section-title {
  margin-bottom: 1.1rem;
}

/* ---------- 团队 ---------- */
.page-about .about-team__head {
  max-width: 70ch;
  margin-bottom: clamp(1.6rem, 4vw, 2.5rem);
}

.page-about .about-team__head .lede {
  margin-top: .9rem;
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.6rem);
  align-items: start;
}

.page-about .about-team__figure {
  margin: 0;
  aspect-ratio: 4 / 3;
  border-radius: var(--about-radius);
  overflow: hidden;
  border: 1px solid var(--mist-10);
}

.page-about .about-team__list {
  display: grid;
  gap: .7rem;
}

.page-about .about-team__item {
  border: 1px solid var(--mist-10);
  border-radius: var(--radius-sm);
  background: var(--mist-06);
  overflow: hidden;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.page-about .about-team__item[open] {
  border-color: var(--cyan-30);
  background: rgba(47, 243, 208, .07);
}

.page-about .about-team__item summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .3rem .9rem;
  padding: .95rem 1.1rem;
  cursor: pointer;
  list-style: none;
}

.page-about .about-team__item summary::-webkit-details-marker {
  display: none;
}

.page-about .about-team__role {
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--mist);
}

.page-about .about-team__count {
  font-family: var(--about-num);
  font-size: .78rem;
  letter-spacing: .02em;
  color: var(--sand);
}

.page-about .about-team__item p {
  margin: 0;
  padding: 0 1.1rem 1.05rem;
  font-size: .93rem;
  line-height: 1.75;
  color: var(--mist-64);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__head {
  margin-bottom: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-timeline__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.8rem);
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.4rem;
  position: relative;
  display: grid;
  gap: .55rem;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: .32rem;
  top: .5rem;
  bottom: .5rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--sand) 55%, var(--wine));
  opacity: .75;
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.22rem;
  top: 1.15rem;
  width: .62rem;
  height: .62rem;
  border-radius: 50%;
  background: var(--deep-sea);
  border: 2px solid var(--cyan);
}

.page-about .about-timeline__node summary {
  display: grid;
  grid-template-columns: 4.4rem auto;
  column-gap: .8rem;
  row-gap: .18rem;
  align-items: center;
  padding: .8rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  list-style: none;
  border: 1px solid var(--mist-10);
  background: var(--mist-06);
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.page-about .about-timeline__node summary::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline__node[open] summary {
  border-color: var(--cyan-30);
  background: rgba(47, 243, 208, .08);
}

.page-about .about-timeline__when {
  grid-row: 1 / span 2;
  font-family: var(--about-num);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .about-timeline__stage {
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--sand);
}

.page-about .about-timeline__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--mist);
}

.page-about .about-timeline__node p {
  margin: .55rem 0 0;
  padding-left: .15rem;
  font-size: .92rem;
  line-height: 1.78;
  color: var(--mist-64);
}

.page-about .about-timeline__figure {
  margin: 0;
  aspect-ratio: 12 / 7;
  border-radius: var(--about-radius);
  overflow: hidden;
  border: 1px solid var(--mist-10);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco__head {
  max-width: 66ch;
  margin-bottom: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-eco__head .lede {
  margin-top: .9rem;
}

.page-about .about-eco__grid {
  display: grid;
  gap: clamp(.9rem, 2.2vw, 1.4rem);
}

.page-about .about-eco__card {
  display: flex;
  flex-direction: column;
  gap: .7rem;
  align-items: flex-start;
}

.page-about .about-eco__card .card__title {
  margin: 0;
  font-size: clamp(1.02rem, 2.6vw, 1.18rem);
  line-height: 1.45;
}

.page-about .about-eco__card .card__text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--mist-64);
}

/* ---------- 服务原则 ---------- */
.page-about .about-principles__head {
  max-width: 66ch;
  margin-bottom: clamp(1.6rem, 4vw, 2.4rem);
}

.page-about .about-principles__head .lede {
  margin-top: .9rem;
}

.page-about .about-principles__grid {
  display: grid;
  gap: clamp(.9rem, 2.2vw, 1.3rem);
}

.page-about .about-principles__card {
  position: relative;
  padding: clamp(1.15rem, 3vw, 1.6rem);
  padding-top: clamp(1.5rem, 3.6vw, 2rem);
  border-radius: var(--about-radius);
  border: 1px solid var(--mist-10);
  background: linear-gradient(165deg, rgba(122, 31, 61, .30), rgba(4, 24, 31, .55));
  overflow: hidden;
  transition: transform .35s var(--ease), border-color .35s var(--ease);
}

.page-about .about-principles__card:nth-child(even) {
  background: linear-gradient(165deg, rgba(59, 42, 107, .38), rgba(4, 24, 31, .55));
}

.page-about .about-principles__card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan-30);
}

.page-about .about-principles__index {
  position: absolute;
  top: -.5rem;
  right: .7rem;
  font-family: var(--about-num);
  font-size: clamp(2.6rem, 8vw, 4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--mist-10);
  pointer-events: none;
}

.page-about .about-principles__card h3 {
  position: relative;
  margin: 0 0 .55rem;
  font-size: clamp(1.02rem, 2.6vw, 1.2rem);
  color: var(--mist);
}

.page-about .about-principles__card p {
  position: relative;
  margin: 0;
  font-size: .92rem;
  line-height: 1.78;
  color: var(--mist-64);
}

.page-about .about-principles__note {
  margin-top: clamp(1.2rem, 3vw, 1.8rem);
  display: flex;
  justify-content: flex-end;
}

.page-about .about-principles__note .vertical-note {
  color: var(--sand);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__inner {
  padding: clamp(1.5rem, 4vw, 2.6rem);
  border-radius: var(--about-radius);
  border: 1px solid var(--mist-10);
  background:
    radial-gradient(100% 130% at 100% 0%, rgba(47, 243, 208, .12), transparent 62%),
    linear-gradient(150deg, rgba(6, 42, 51, .95), rgba(4, 24, 31, .95));
}

.page-about .about-next__lede {
  margin-top: .85rem;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.4rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-eco__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: clamp(2rem, 6vw, 5.5rem);
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: center;
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: clamp(1.8rem, 4.5vw, 3.4rem);
  }

  .page-about .about-team__figure {
    position: sticky;
    top: 6rem;
  }

  .page-about .about-timeline__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
    gap: clamp(1.8rem, 4.5vw, 3.2rem);
  }

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

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

@media (min-width: 1180px) {
  .page-about .about-hero__aside {
    margin-bottom: .75rem;
  }
}

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

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