.page-about {
  --about-gap: clamp(20px, 3vw, 30px);
  --about-accent: var(--cyan);
  padding-block: clamp(18px, 3.5vw, 30px) clamp(48px, 8vw, 92px);
  overflow-x: clip;
}

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

/* ---------- 面包屑 ---------- */
.page-about .about-breadcrumb {
  margin-bottom: clamp(16px, 3vw, 26px);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--muted);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--line);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color 160ms var(--ease);
}

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

.page-about .breadcrumb [aria-current="page"] {
  color: var(--text);
}

/* ---------- 封面导语区 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(8px, 2vw, 18px);
  margin-bottom: clamp(46px, 7vw, 86px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(var(--line) 1px, transparent 1px);
  background-size: 100% 92px;
  opacity: 0.18;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 76%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 76%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__copy {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(34px, 5.4vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-stretch: 87%;
  font-weight: 900;
  color: var(--text);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 46ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-hero__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-hero__facts .mono {
  color: var(--cyan);
  font-size: 15px;
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__figure img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.page-about .media-frame__cap {
  margin: 10px 0 0;
  font-size: 12.5px;
  letter-spacing: 0.05em;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 章节标题栏 ---------- */
.page-about .section-head__index {
  color: var(--cyan);
}

/* ---------- 01 时间线 ---------- */
.page-about .rail-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
}

.page-about .rail-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--cyan) 0%, var(--line) 52%, transparent 100%);
}

.page-about .rail-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
}

.page-about .rail-timeline__dot {
  position: absolute;
  left: -30px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  transition: background-color 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .rail-timeline__item:hover .rail-timeline__dot {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(37, 225, 212, 0.14);
}

.page-about .rail-timeline__stage {
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .rail-timeline__body h3 {
  margin: 0 0 6px;
  font-size: 19px;
  line-height: 1.4;
  color: var(--text);
  font-weight: 700;
}

.page-about .rail-timeline__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 02 三类服务 ---------- */
.page-about .about-services__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .about-service {
  display: grid;
  gap: 13px;
  align-content: start;
  padding: clamp(20px, 2.4vw, 28px);
  border-top: 2px solid var(--about-accent, var(--cyan));
}

.page-about .about-service:nth-child(1) { --about-accent: var(--cyan); }
.page-about .about-service:nth-child(2) { --about-accent: var(--orange); }
.page-about .about-service:nth-child(3) { --about-accent: var(--rose); }

.page-about .about-service > .tag {
  justify-self: start;
}

.page-about .about-service h3 {
  margin: 0;
  font-size: 21px;
  line-height: 1.35;
  color: var(--text);
  font-weight: 700;
}

.page-about .about-service p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-service__list {
  margin: 2px 0 0;
  padding: 12px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 8px;
}

.page-about .about-service__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text);
}

.page-about .about-service__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 1px;
  background: var(--about-accent, var(--cyan));
}

/* ---------- 03 版本档案 ---------- */
.page-about .about-versions__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .archive-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .archive-item {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  grid-template-areas:
    "ver body"
    "kind body";
  align-items: start;
  gap: 4px 16px;
  padding: 16px 10px;
  border-bottom: 1px solid var(--line);
  transition: background-color 180ms var(--ease), padding-left 180ms var(--ease);
}

.page-about .archive-item:hover {
  background: rgba(37, 225, 212, 0.06);
  padding-left: 18px;
}

.page-about .archive-item__ver {
  grid-area: ver;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  padding-top: 2px;
}

.page-about .archive-item__body {
  grid-area: body;
  min-width: 0;
}

.page-about .archive-item__body h3 {
  margin: 0 0 4px;
  font-size: 17px;
  line-height: 1.45;
  color: var(--text);
  font-weight: 700;
}

.page-about .archive-item__body p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .archive-item__kind {
  grid-area: kind;
  justify-self: start;
  align-self: start;
  margin-top: 2px;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  line-height: 1.6;
  border: 1px solid var(--line);
  color: var(--muted);
}

.page-about .archive-item__kind--nav {
  border-color: rgba(37, 225, 212, 0.45);
  color: var(--cyan-soft);
}

.page-about .archive-item__kind--export {
  border-color: rgba(255, 155, 61, 0.45);
  color: var(--orange);
}

.page-about .archive-item__kind--right {
  border-color: rgba(255, 78, 124, 0.45);
  color: var(--rose);
}

.page-about .about-versions__figure {
  margin: 0;
}

.page-about .about-versions__figure img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

/* ---------- 04 运营数据 ---------- */
.page-about .about-numbers__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-number {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: clamp(16px, 2.2vw, 26px);
  background: var(--panel);
}

.page-about .about-number dt {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-number dd {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: flex-end;
  gap: 5px;
}

.page-about .about-number__value {
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-number__unit {
  font-size: 12.5px;
  color: var(--muted);
}

.page-about .about-numbers__note {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  max-width: 68ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
  padding-left: 16px;
  border-left: 2px solid var(--orange);
}

/* ---------- 05 合作生态 ---------- */
.page-about .about-partners__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
}

.page-about .about-partners__figure {
  margin: 0;
}

.page-about .about-partners__figure img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.page-about .about-partners__copy {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .about-partners__lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-partners__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-partners__list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
}

.page-about .about-partners__list .mono {
  font-size: 12px;
  color: var(--orange);
}

.page-about .about-partners__copy .btn {
  justify-self: start;
}

/* ---------- 06 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .about-role {
  display: grid;
  gap: 9px;
  align-content: start;
  padding: clamp(20px, 2.4vw, 26px);
}

.page-about .about-role__key {
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-role h3 {
  margin: 0;
  font-size: 19px;
  line-height: 1.4;
  color: var(--text);
  font-weight: 700;
}

.page-about .about-role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-team__note {
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
  padding-left: 16px;
  border-left: 2px solid var(--rose);
}

/* ---------- 相关入口 ---------- */
.page-about .about-next__inner {
  border-top: 1px solid var(--line);
  padding-top: clamp(20px, 3vw, 32px);
}

.page-about .about-next h2 {
  margin: 0 0 18px;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.35;
  color: var(--text);
  font-weight: 700;
}

.page-about .about-next__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-next__list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 14.5px;
  text-decoration: none;
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  border-color: var(--cyan);
  background: rgba(37, 225, 212, 0.07);
}

.page-about .about-next__list .mono {
  color: var(--cyan);
  font-size: 12.5px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .rail-timeline__item {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }

  .page-about .rail-timeline__stage {
    padding-top: 3px;
  }

  .page-about .archive-item {
    grid-template-columns: 92px minmax(0, 1fr) auto;
    grid-template-areas: "ver .page-about kind";
    gap: 0 18px;
    align-items: start;
  }

  .page-about .archive-item__kind {
    margin-top: 3px;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 5.5fr) minmax(0, 6.5fr);
    align-items: end;
  }

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

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

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

@media (min-width: 1020px) {
  .page-about .about-versions__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-versions__figure {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .archive-item,
  .page-about .rail-timeline__dot,
  .page-about .about-next__list a,
  .page-about .breadcrumb a {
    transition: none;
  }
}
<<<END>>>