.page-about {
  --about-gap: clamp(32px, 5vw, 76px);
  --about-rule: 1px solid var(--line);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: .55rem;
  padding: 22px 0 4px;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .08em;
  color: var(--quiet);
}
.page-about .breadcrumb a {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--lake);
  border-bottom-color: var(--lake);
}
.page-about .breadcrumb__sep {
  color: rgba(195, 205, 214, .32);
}

/* ---------- 通用小节标题微调 ---------- */
.page-about .sect__head {
  max-width: 62ch;
}
.page-about .sect__idx {
  color: var(--lake);
  font-size: .8125rem;
  letter-spacing: .12em;
  margin: 0 0 .8em;
}
.page-about .sect__title {
  margin: 0 0 .7em;
  color: var(--mist);
  letter-spacing: -.015em;
}
.page-about .sect__sum {
  color: var(--silver);
  line-height: 1.8;
  margin: 0;
}

/* ---------- 01 开场 ---------- */
.page-about .about-open {
  padding-block: clamp(20px, 3vw, 40px) clamp(52px, 8vw, 104px);
  position: relative;
}
.page-about .about-open::before {
  content: "";
  position: absolute;
  inset: -10% 40% 30% -10%;
  background:
    radial-gradient(closest-side at 30% 40%, rgba(20, 112, 143, .32), transparent 72%),
    radial-gradient(closest-side at 70% 70%, rgba(46, 158, 134, .18), transparent 70%);
  pointer-events: none;
  z-index: -1;
}
.page-about .about-open__grid {
  row-gap: clamp(30px, 4vw, 48px);
}
.page-about .about-open__main {
  min-width: 0;
}
.page-about .about-open .eyebrow {
  color: var(--quiet);
  font-family: var(--font-mono);
  letter-spacing: .16em;
  font-size: .8125rem;
  margin: 0 0 1em;
}
.page-about .about-open__title {
  margin: 0 0 .55em;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(2rem, 5.2vw, 3.9rem);
  line-height: 1.08;
  letter-spacing: -.028em;
  color: var(--mist);
}
.page-about .about-open__lead {
  max-width: 36em;
  margin: 0 0 1.5em;
  padding-left: 1.05em;
  border-left: 2px solid var(--blue);
  font-size: clamp(1.02rem, 1.3vw, 1.2rem);
  line-height: 1.76;
  color: var(--mist);
}
.page-about .about-open__body {
  max-width: 40em;
  margin: 0;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-open__aside {
  align-self: start;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--glass);
  border: 1px solid var(--line);
  border-left: 2px solid var(--lake);
  border-radius: 3px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.page-about .about-open__aside-title {
  margin: 0 0 1.1em;
  font-size: .75rem;
  letter-spacing: .18em;
  color: var(--lake);
}
.page-about .about-facts {
  display: grid;
  gap: 0;
  margin: 0;
}
.page-about .about-fact {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .35em .9em;
  padding: .85em 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .about-fact:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-fact dt {
  flex: 0 0 auto;
  font-size: .8125rem;
  color: var(--quiet);
  letter-spacing: .04em;
}
.page-about .about-fact dd {
  flex: 1 1 auto;
  margin: 0;
  text-align: right;
  color: var(--mist);
  font-size: .9375rem;
  line-height: 1.6;
}

/* ---------- 02 演进时间轴 ---------- */
.page-about .about-axis {
  position: relative;
  overflow: hidden;
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
  padding-block: clamp(48px, 7vw, 88px) clamp(24px, 4vw, 44px);
}
.page-about .about-axis__stage {
  position: relative;
}
.page-about .about-axis__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .2;
  filter: saturate(.85);
  pointer-events: none;
}
.page-about .about-axis__stage > .wrap {
  position: relative;
  z-index: 1;
}
.page-about .about-axis__head {
  max-width: 58ch;
}

.page-about .about-timeline {
  display: flex;
  gap: 0;
  margin: 0;
  padding: clamp(34px, 4vw, 52px) 0 20px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--blue-deep) transparent;
}
.page-about .about-timeline::-webkit-scrollbar {
  height: 6px;
}
.page-about .about-timeline::-webkit-scrollbar-track {
  background: var(--line-soft);
  border-radius: 3px;
}
.page-about .about-timeline::-webkit-scrollbar-thumb {
  background: var(--blue-deep);
  border-radius: 3px;
}
.page-about .about-step {
  position: relative;
  flex: 0 0 auto;
  width: min(76vw, 310px);
  padding: 34px 28px 0 0;
  scroll-snap-align: start;
}
.page-about .about-step::before {
  content: "";
  position: absolute;
  top: 5px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--blue) 0%, rgba(20, 112, 143, .16) 100%);
}
.page-about .about-step:last-child::before {
  background: linear-gradient(90deg, var(--blue) 0%, transparent 100%);
}
.page-about .about-step__node {
  position: absolute;
  top: 0;
  left: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--blue-deep);
  border: 1px solid var(--silver);
  transition: background .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}
.page-about .about-step:first-child .about-step__node {
  background: var(--pulse);
  border-color: var(--pulse);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, .16);
}
.page-about .about-step:hover .about-step__node,
.page-about .about-step:focus-within .about-step__node {
  background: var(--pulse);
  border-color: var(--pulse);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, .16);
}
.page-about .about-step__no {
  display: block;
  font-size: .8125rem;
  letter-spacing: .14em;
  color: var(--lake);
  margin: 0 0 .9em;
}
.page-about .about-step__title {
  margin: 0 0 .6em;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--mist);
  letter-spacing: -.005em;
}
.page-about .about-step__body {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team {
  padding-block: var(--about-gap);
}
.page-about .about-team__grid {
  row-gap: clamp(36px, 5vw, 56px);
  align-items: start;
}
.page-about .about-team__text {
  min-width: 0;
}
.page-about .about-team__text .sect__sum {
  border-left: 2px solid var(--blue);
  padding-left: 1.05em;
}
.page-about .about-groups {
  list-style: none;
  margin: clamp(30px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .about-group {
  position: relative;
  padding: 18px 18px 16px 18px;
  background: var(--solid);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--blue-deep);
  border-radius: 3px;
  transition: border-left-color .25s var(--ease), transform .3s var(--ease), background .25s var(--ease);
}
.page-about .about-group:nth-child(2) {
  margin-left: 18px;
}
.page-about .about-group:nth-child(3) {
  margin-left: 36px;
}
.page-about .about-group:hover,
.page-about .about-group:focus-within {
  border-left-color: var(--pulse);
  background: #102F3C;
  transform: translateX(4px);
}
.page-about .about-group__idx {
  display: inline-block;
  font-size: .75rem;
  letter-spacing: .14em;
  color: var(--quiet);
  margin-bottom: .5em;
}
.page-about .about-group__name {
  margin: 0 0 .45em;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--mist);
}
.page-about .about-group__desc {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.78;
  color: var(--silver);
}
.page-about .about-group__tasks {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  margin: 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  line-height: 1.7;
  color: var(--lake);
  transition: max-height .34s var(--ease), opacity .24s var(--ease), margin-top .34s var(--ease);
}
.page-about .about-group:hover .about-group__tasks,
.page-about .about-group:focus-within .about-group__tasks {
  max-height: 5em;
  opacity: 1;
  margin-top: .7em;
}
.page-about .about-team__fig {
  margin: 0;
}
.page-about .about-team__fig img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 4;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 3px;
  filter: saturate(.85) contrast(1.05);
}
.page-about .about-team__cap {
  margin: .9em 0 0;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--quiet);
}

/* ---------- 04 更新与数据 ---------- */
.page-about .about-flow {
  padding-block: var(--about-gap);
  border-top: var(--about-rule);
}
.page-about .about-flow__grid {
  row-gap: clamp(32px, 4vw, 48px);
  align-items: start;
}
.page-about .about-flow__intro {
  min-width: 0;
}
.page-about .about-flow__list {
  display: grid;
  gap: 0;
  min-width: 0;
}
.page-about .about-flow__item {
  display: grid;
  grid-template-columns: 3.2rem 1fr;
  gap: 0 1.2rem;
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .about-flow__item:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-flow__no {
  font-size: .8125rem;
  letter-spacing: .14em;
  color: var(--lake);
  padding-top: .3em;
}
.page-about .about-flow__name {
  margin: 0 0 .5em;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--mist);
}
.page-about .about-flow__desc {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.82;
  color: var(--silver);
}

/* ---------- 05 服务覆盖 ---------- */
.page-about .about-reach {
  padding-block: var(--about-gap);
  position: relative;
}
.page-about .about-reach::before {
  content: "";
  position: absolute;
  inset: 0 0 0 0;
  background: linear-gradient(180deg, rgba(10, 75, 96, .34) 0%, rgba(6, 26, 36, 0) 78%);
  pointer-events: none;
  z-index: -1;
}
.page-about .about-reach__head {
  max-width: 54ch;
}
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin-top: clamp(32px, 4vw, 52px);
  border-top: 1px solid rgba(46, 158, 134, .5);
}
.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: .45em;
  padding: clamp(22px, 3vw, 34px) clamp(18px, 2.6vw, 32px) clamp(20px, 2.6vw, 30px) 0;
  border-right: 1px solid var(--line-soft);
}
.page-about .about-stat:last-child {
  border-right: 0;
  padding-right: 0;
}
.page-about .about-stat__num {
  font-size: clamp(1.9rem, 3.6vw, 2.9rem);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--mist);
}
.page-about .about-stat__unit {
  font-size: .55em;
  margin-left: .08em;
  color: var(--lake);
}
.page-about .about-stat__label {
  font-size: .9375rem;
  color: var(--lake);
  letter-spacing: .02em;
}
.page-about .about-stat__note {
  font-size: .875rem;
  line-height: 1.75;
  color: var(--quiet);
}
.page-about .about-reach__foot {
  margin: clamp(28px, 3.4vw, 44px) 0 0;
  max-width: 62ch;
  padding-left: 1.05em;
  border-left: 2px solid var(--blue);
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--silver);
}

/* ---------- 06 青海在地 ---------- */
.page-about .about-plateau {
  padding-block: 0 var(--about-gap);
}
.page-about .about-plateau__fig {
  margin: 0 0 clamp(36px, 5vw, 60px);
}
.page-about .about-plateau__fig img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 7;
  height: auto;
  object-fit: cover;
  filter: saturate(.8) brightness(.85);
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
}
.page-about .about-plateau__grid {
  row-gap: 28px;
}
.page-about .about-plateau__text {
  min-width: 0;
}
.page-about .about-plateau__text .sect__sum {
  margin-bottom: 1.4em;
}
.page-about .about-plateau__body {
  margin: 0;
  max-width: 42em;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--silver);
}

/* ---------- 07 合作生态 ---------- */
.page-about .about-eco {
  padding-block: var(--about-gap);
  border-top: var(--about-rule);
}
.page-about .about-eco__grid {
  row-gap: clamp(32px, 4vw, 48px);
  align-items: start;
}
.page-about .about-eco__main {
  min-width: 0;
}
.page-about .about-eco__body {
  margin: 0;
  max-width: 46em;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--silver);
}
.page-about .about-eco__aside {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: 3px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.page-about .about-eco__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}
.page-about .about-eco__item {
  display: grid;
  gap: .35em;
  padding: 1em 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .about-eco__item:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-eco__num {
  font-size: 1.0625rem;
  letter-spacing: .02em;
  color: var(--lake);
}
.page-about .about-eco__txt {
  font-size: .875rem;
  line-height: 1.72;
  color: var(--silver);
}

/* ---------- 08 未来方向 ---------- */
.page-about .about-next {
  padding-block: var(--about-gap);
}
.page-about .about-next__grid {
  row-gap: clamp(32px, 4vw, 48px);
  align-items: start;
}
.page-about .about-next__intro {
  min-width: 0;
}
.page-about .about-next__paths {
  display: grid;
  gap: 0;
  min-width: 0;
}
.page-about .about-path {
  padding: clamp(18px, 2.6vw, 28px) 0 clamp(18px, 2.6vw, 28px) clamp(16px, 2vw, 24px);
  border-top: 1px solid var(--line-soft);
  border-left: 2px solid transparent;
  transition: border-left-color .25s var(--ease), padding-left .3s var(--ease);
}
.page-about .about-path:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-path:hover,
.page-about .about-path:focus-within {
  border-left-color: var(--lake);
  padding-left: clamp(22px, 2.6vw, 32px);
}
.page-about .about-path__no {
  display: block;
  font-size: .75rem;
  letter-spacing: .16em;
  color: var(--quiet);
  margin-bottom: .6em;
}
.page-about .about-path__name {
  margin: 0 0 .5em;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--mist);
}
.page-about .about-path__desc {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.82;
  color: var(--silver);
}

/* ---------- 收束 ---------- */
.page-about .about-start {
  padding-block: 0 clamp(60px, 8vw, 110px);
}
.page-about .about-start__panel {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  padding: clamp(26px, 4vw, 52px);
  background: linear-gradient(135deg, rgba(20, 112, 143, .28) 0%, rgba(10, 75, 96, .42) 55%, rgba(6, 26, 36, .9) 100%);
  border: 1px solid var(--line);
  border-radius: 3px;
}
.page-about .about-start__title {
  margin: 0 0 .6em;
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  font-weight: 700;
  letter-spacing: -.015em;
  color: var(--mist);
}
.page-about .about-start__desc {
  margin: 0;
  max-width: 52ch;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--silver);
}
.page-about .about-start__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .8rem 1rem;
}
.page-about .about-start__link {
  font-size: .875rem;
  color: var(--quiet);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .about-start__link:hover,
.page-about .about-start__link:focus-visible {
  color: var(--lake);
  border-bottom-color: var(--lake);
}

/* ---------- 触屏设备：职责卡附加信息常显 ---------- */
@media (hover: none) {
  .page-about .about-group__tasks {
    max-height: 6em;
    opacity: 1;
    margin-top: .7em;
  }
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-start__panel {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (max-width: 1080px) {
  .page-about .about-open__main,
  .page-about .about-open__aside,
  .page-about .about-team__text,
  .page-about .about-team__fig,
  .page-about .about-flow__intro,
  .page-about .about-flow__list,
  .page-about .about-eco__main,
  .page-about .about-eco__aside,
  .page-about .about-next__intro,
  .page-about .about-next__paths,
  .page-about .about-plateau__text {
    grid-column: 1 / -1;
  }
  .page-about .about-open__aside {
    max-width: 34rem;
  }
  .page-about .about-team__fig img {
    aspect-ratio: 16 / 10;
  }
  .page-about .about-stats {
    grid-template-columns: minmax(0, 1fr);
    border-top: 0;
  }
  .page-about .about-stat {
    border-right: 0;
    border-top: 1px solid rgba(46, 158, 134, .45);
    padding-right: 0;
  }
  .page-about .about-stat:first-child {
    border-top: 1px solid rgba(46, 158, 134, .5);
  }
}

@media (max-width: 720px) {
  .page-about .breadcrumb {
    padding-top: 18px;
  }
  .page-about .about-open__title {
    font-size: clamp(1.8rem, 8vw, 2.4rem);
  }
  .page-about .about-open__lead {
    font-size: 1rem;
    padding-left: .85em;
  }
  .page-about .about-open__aside {
    max-width: none;
    padding: 16px;
  }
  .page-about .about-fact {
    flex-direction: column;
    gap: .2em;
  }
  .page-about .about-fact dd {
    text-align: left;
  }
  .page-about .about-step {
    width: min(84vw, 300px);
    padding-right: 20px;
  }
  .page-about .about-group:nth-child(2),
  .page-about .about-group:nth-child(3) {
    margin-left: 0;
  }
  .page-about .about-flow__item {
    grid-template-columns: minmax(0, 1fr);
    gap: .5em 0;
  }
  .page-about .about-flow__no {
    padding-top: 0;
  }
  .page-about .about-plateau__fig img {
    aspect-ratio: 4 / 3;
  }
  .page-about .about-eco__aside {
    padding: 16px;
  }
  .page-about .about-path {
    padding-left: 14px;
  }
  .page-about .about-path:hover,
  .page-about .about-path:focus-within {
    padding-left: 18px;
  }
  .page-about .about-start__panel {
    padding: 22px 18px;
  }
}
<<<END>>>