.page-about {
  --about-tl-pad: clamp(30px, 4.2vw, 64px);
  position: relative;
}

/* 左缘玻璃描边，与框架导航呼应 */
.page-about::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--line) 10%, var(--line) 90%, transparent);
  pointer-events: none;
}

.page-about .media-frame {
  margin: 0;
}

/* ---------- 开篇 ---------- */
.page-about .about-open__grid {
  display: grid;
  gap: clamp(30px, 4vw, 56px);
  margin-top: clamp(20px, 3vw, 36px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-open__lead {
  min-width: 0;
}

.page-about .about-open__figure {
  align-self: end;
}

.page-about .about-open__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  margin: clamp(22px, 2.8vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-open__jump a {
  display: inline-block;
  padding: 7px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--paper);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  transition: border-color .22s var(--ease), color .22s var(--ease), background .22s var(--ease);
}

.page-about .about-open__jump a:hover,
.page-about .about-open__jump a:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(59, 240, 208, .06);
}

/* ---------- 起点 ---------- */
.page-about .about-first p {
  max-width: 34em;
}

.page-about .about-first__grid {
  display: grid;
  gap: clamp(18px, 2.4vw, 28px);
  margin: clamp(26px, 3.4vw, 42px) 0 0;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-first__fact {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .about-first__fact .num {
  display: block;
  margin-bottom: 8px;
}

.page-about .about-first__fact p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-first .plate {
  margin-top: clamp(26px, 3.4vw, 40px);
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl__intro {
  max-width: 42em;
}

.page-about .about-tl__lead {
  margin-top: 14px;
  color: var(--muted);
}

.page-about .about-tl__list {
  position: relative;
  display: grid;
  gap: clamp(26px, 3.4vw, 44px);
  margin: clamp(34px, 5vw, 58px) 0 0;
  padding: 0 0 0 var(--about-tl-pad);
  list-style: none;
}

.page-about .about-tl__list::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 0;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg,
    var(--gold) 0%,
    var(--gold) 16%,
    var(--cyan-dim) 58%,
    rgba(46, 74, 67, .3) 100%);
  opacity: .6;
}

.page-about .about-stage {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px clamp(14px, 2vw, 26px);
  align-items: start;
  min-width: 0;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  top: 13px;
  left: calc(-1 * var(--about-tl-pad) - 4px);
  width: 10px;
  height: 10px;
  border: 2px solid var(--gold);
  background: var(--ink);
  transform: rotate(45deg);
  transition: background .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-stage:hover::before,
.page-about .about-stage:focus-within::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-stage__num {
  font-family: var(--font-num);
  font-size: clamp(30px, 4.4vw, 52px);
  font-weight: 700;
  line-height: .95;
  letter-spacing: -.02em;
  color: var(--gold);
  flex: none;
}

.page-about .about-stage__main {
  min-width: 0;
}

.page-about .about-stage__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(18px, 2.1vw, 23px);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-stage__body {
  margin-top: 10px;
  padding: clamp(14px, 1.8vw, 20px) clamp(16px, 2vw, 24px);
  border: 1px solid var(--line);
  border-left: 2px solid rgba(201, 162, 39, .5);
  border-radius: 2px;
  background: rgba(18, 48, 42, .5);
  transition: background .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-stage:hover .about-stage__body,
.page-about .about-stage:focus-within .about-stage__body {
  background: rgba(18, 48, 42, .84);
  border-left-color: var(--cyan);
}

.page-about .about-stage__body p {
  margin: 0;
  color: var(--paper);
  font-size: 16px;
  line-height: 1.72;
}

.page-about .about-stage__fix {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 12px !important;
  padding-top: 12px;
  border-top: 1px dashed rgba(46, 74, 67, .9);
  color: var(--muted) !important;
  font-size: 14px !important;
  line-height: 1.65 !important;
}

.page-about .about-stage__fix .tag {
  flex: none;
  margin-top: 2px;
}

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

.page-about .about-stage--figure::before {
  display: none;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}

.page-about .about-team__body p {
  max-width: 36em;
}

.page-about .stat-row {
  display: grid;
  gap: 1px;
  margin-top: clamp(24px, 3vw, 34px);
  border: 1px solid var(--line);
  background: var(--line);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .stat-cell {
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--ink-2);
}

.page-about .stat-cell__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(38px, 5.4vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--gold-soft);
}

.page-about .stat-cell__unit {
  margin-left: .14em;
  font-size: .4em;
  font-weight: 500;
  color: var(--muted);
}

.page-about .stat-cell__label {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.62;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners .h2 {
  max-width: 20em;
}

.page-about .about-partners__accordion {
  margin-top: clamp(24px, 3vw, 36px);
}

.page-about .about-partners__q,
.page-about .about-cadence__q {
  margin: 0;
}

.page-about .about-partners__q .accordion__trigger,
.page-about .about-cadence__q .accordion__trigger {
  font-family: var(--font-head);
  font-size: clamp(16px, 1.8vw, 19px);
  letter-spacing: -.01em;
  text-align: left;
}

.page-about .about-partners__label,
.page-about .about-cadence__label {
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .about-partners .plate {
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---------- 服务规模 ---------- */
.page-about .about-scale__head {
  max-width: 40em;
}

.page-about .about-scale__head p {
  margin-top: 14px;
  color: var(--muted);
}

.page-about .about-scale__list {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  margin: clamp(32px, 4.2vw, 52px) 0 0;
  padding: 0;
  list-style: none;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-scale__item {
  display: grid;
  gap: 10px clamp(18px, 2.6vw, 34px);
  padding-top: clamp(18px, 2.4vw, 26px);
  border-top: 1px solid var(--line);
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}

.page-about .about-scale__num {
  font-family: var(--font-num);
  font-size: clamp(46px, 7.4vw, 88px);
  font-weight: 700;
  line-height: .92;
  letter-spacing: -.03em;
  color: var(--gold-soft);
}

.page-about .about-scale__item:nth-child(2) .about-scale__num {
  color: var(--paper);
}

.page-about .about-scale__item:nth-child(3) .about-scale__num {
  color: var(--cyan);
}

.page-about .about-scale__unit {
  margin-left: .12em;
  font-size: .34em;
  font-weight: 500;
  color: var(--muted);
}

.page-about .about-scale__item:nth-child(3) .about-scale__unit {
  color: rgba(59, 240, 208, .72);
}

.page-about .about-scale__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.36;
  color: var(--paper);
}

.page-about .about-scale__text p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.72;
  max-width: 34em;
}

/* ---------- 维护节奏 ---------- */
.page-about .about-cadence p {
  max-width: 34em;
}

.page-about .about-cadence__accordion {
  margin-top: clamp(24px, 3vw, 36px);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__box {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
  padding-top: clamp(26px, 3.4vw, 40px);
  border-top: 1px solid var(--gold);
  grid-template-columns: minmax(0, 1fr);
  align-items: center;
}

.page-about .about-next__text p {
  max-width: 36em;
  color: var(--muted);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-first__grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }

  .page-about .stat-row {
    grid-template-columns: 1.3fr 1fr 1fr;
  }

  .page-about .about-scale__item {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .about-scale__num {
    min-width: 3.6em;
  }
}

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

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

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

  .page-about .about-scale__item:nth-child(1) {
    grid-column: 1 / -1;
  }

  .page-about .about-scale__item:nth-child(1) .about-scale__num {
    font-size: clamp(60px, 8vw, 110px);
  }

  .page-about .about-next__box {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

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

@media (min-width: 1180px) {
  .page-about .about-stage__body {
    max-width: 46em;
  }

  .page-about .about-tl__list {
    padding-right: clamp(0px, 6vw, 90px);
  }
}
<<<END>>>