.page-about {
  --about-tight: clamp(1.5rem, 4vw, 2.5rem);
  --about-gap: clamp(2.25rem, 6vw, 4rem);
  padding-bottom: clamp(2.5rem, 7vw, 5rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.75rem, 5vw, 3rem) 0 clamp(2.25rem, 6vw, 3.75rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -32%;
  right: -14%;
  width: min(620px, 80vw);
  height: min(620px, 80vw);
  background: radial-gradient(circle, rgba(47, 184, 166, 0.18) 0%, rgba(47, 184, 166, 0) 62%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  bottom: -38%;
  left: -10%;
  width: min(440px, 62vw);
  height: min(440px, 62vw);
  background: radial-gradient(circle, rgba(255, 90, 54, 0.16) 0%, rgba(255, 90, 54, 0) 66%);
  pointer-events: none;
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
  margin-top: clamp(1.25rem, 4vw, 2.25rem);
}

.page-about .about-hero-copy h1.display {
  margin: 0.85rem 0 1.15rem;
  max-width: 15em;
}

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

.page-about .about-facts > div {
  background: var(--ink-800);
  padding: 0.9rem 0.95rem 1rem;
}

.page-about .about-facts dt {
  color: var(--mist);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  line-height: 1.5;
}

.page-about .about-facts dd {
  margin: 0.4rem 0 0;
  color: var(--paper);
  font-size: 0.9rem;
}

.page-about .about-facts dd .mono {
  font-size: 1.5rem;
  line-height: 1;
  color: var(--signal-soft);
  margin-right: 0.2rem;
}

/* ---------- 布局与锚点轨道 ---------- */
.page-about .about-layout {
  padding-top: clamp(2rem, 5vw, 3.25rem);
}

.page-about .about-rail {
  margin-bottom: var(--about-tight);
}

.page-about .about-rail-list {
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail-list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--line);
  color: var(--mist);
  font-size: 0.8rem;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-rail-list a .mono {
  font-size: 0.68rem;
  color: var(--signal-soft);
  letter-spacing: 0.1em;
}

.page-about .about-rail-list a:hover,
.page-about .about-rail-list a:focus-visible {
  color: var(--paper);
  border-color: var(--teal);
  background: var(--ink-800);
}

.page-about .about-top {
  display: none;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding: var(--about-gap) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec--band {
  background: linear-gradient(180deg, rgba(18, 36, 58, 0.95) 0%, rgba(18, 36, 58, 0.55) 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: clamp(1.75rem, 5vw, 3rem) clamp(1rem, 3vw, 2rem);
  margin: clamp(1rem, 3vw, 1.75rem) 0;
}

.page-about .about-sec-head {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-sec-head h2 {
  margin: 0.6rem 0 0.9rem;
  max-width: 22em;
}

.page-about .about-sec-head .prose {
  max-width: var(--measure);
}

/* ---------- 起点 ---------- */
.page-about .about-duo {
  display: grid;
  gap: 1.1rem;
}

.page-about .about-duo .prose {
  margin: 0;
  max-width: var(--measure);
}

.page-about .about-pillars {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-pillar {
  background: var(--ink-900);
  padding: 1.25rem 1.1rem 1.4rem;
  position: relative;
  transition: background var(--dur) var(--ease);
}

.page-about .about-pillar:hover {
  background: var(--ink-800);
}

.page-about .about-pillar-idx {
  display: inline-block;
  color: var(--signal);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
}

.page-about .about-pillar h3 {
  margin: 0.5rem 0 0.45rem;
  font-size: 1.08rem;
  color: var(--paper);
}

.page-about .about-pillar p {
  margin: 0;
  color: var(--mist);
  font-size: 0.9rem;
  line-height: 1.68;
}

/* ---------- 历程 ---------- */
.page-about .about-tl-wrap {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .tl-item {
  display: grid;
  grid-template-columns: 3.75rem minmax(0, 1fr);
  gap: 0 0.9rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  background: var(--ink-900);
  padding: 1.05rem 1rem 1.2rem;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .tl-item:hover,
.page-about .tl-item:focus-within {
  border-left-color: var(--signal);
  background: var(--ink-700);
}

.page-about .tl-year {
  color: var(--signal-soft);
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  padding-top: 0.15rem;
}

.page-about .tl-body h3 {
  margin: 0 0 0.45rem;
  font-size: 1rem;
  color: var(--paper);
}

.page-about .tl-body p {
  margin: 0;
  color: var(--mist);
  font-size: 0.88rem;
  line-height: 1.7;
}

.page-about .tl-chip {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.7rem;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(1.5rem, 4vw, 2rem) 0 0;
}

.page-about .about-figure--solo {
  margin-top: 0;
}

.page-about .about-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-about .about-figure .media-caption {
  margin-top: 0.6rem;
  color: var(--mist);
  font-size: 0.76rem;
  line-height: 1.6;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .about-team-copy .prose {
  margin: 0;
  max-width: var(--measure);
}

.page-about .about-team-copy .prose + .prose {
  margin-top: 1rem;
}

.page-about .about-cities {
  list-style: none;
  margin: clamp(1.1rem, 3vw, 1.6rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-cities li {
  background: var(--ink-800);
  padding: 0.85rem 0.9rem;
  color: var(--mist);
  font-size: 0.86rem;
  line-height: 1.6;
}

.page-about .about-cities .mono {
  display: block;
  color: var(--paper);
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  margin-bottom: 0.3rem;
}

.page-about .about-map-wrap {
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  padding: clamp(0.75rem, 2vw, 1.25rem);
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 50% 130%, rgba(47, 184, 166, 0.14) 0%, rgba(47, 184, 166, 0) 62%),
    var(--ink-900);
}

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

.page-about .map-line {
  fill: none;
  stroke: var(--teal);
  stroke-width: 1.6;
  stroke-dasharray: 4 6;
  opacity: 0.75;
}

.page-about .map-line--soft {
  stroke: var(--line);
  stroke-dasharray: 2 8;
  opacity: 1;
}

.page-about .map-halo {
  fill: var(--signal);
  opacity: 0.16;
}

.page-about .map-node {
  fill: var(--signal);
}

.page-about .map-label {
  fill: var(--paper);
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.12em;
}

/* ---------- 合作 ---------- */
.page-about .partner-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .partner-card {
  border: 1px solid var(--line);
  background: var(--ink-900);
  padding: 1.15rem 1.1rem 1.25rem;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .partner-card:hover,
.page-about .partner-card:focus-within {
  border-color: var(--teal);
  background: var(--ink-700);
}

.page-about .partner-card h3 {
  margin: 0.5rem 0 0.5rem;
  font-size: 1.02rem;
  color: var(--paper);
}

.page-about .partner-card p {
  margin: 0;
  color: var(--mist);
  font-size: 0.88rem;
  line-height: 1.68;
}

.page-about .partner-card .partner-type {
  margin: 0.9rem 0 0;
  width: 100%;
  border-top: 1px solid var(--line);
  padding-top: 0.6rem;
  color: var(--teal-glow);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
}

/* ---------- 成果 ---------- */
.page-about .about-stats {
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats > div {
  background: var(--ink-900);
  padding: 1.2rem 1.1rem 1.35rem;
  display: flex;
  flex-direction: column-reverse;
  gap: 0.5rem;
}

.page-about .about-stats dt {
  color: var(--mist);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  line-height: 1.55;
}

.page-about .about-stats dd {
  margin: 0;
}

.page-about .stat-num {
  font-size: clamp(1.9rem, 4.4vw, 2.6rem);
  line-height: 1;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .stat-unit {
  font-size: 0.82rem;
  color: var(--signal-soft);
  margin-left: 0.35rem;
}

/* ---------- 下一步 ---------- */
.page-about .next-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .next-item {
  background: var(--ink-900);
  padding: 1.2rem 1.1rem 1.35rem;
  transition: background var(--dur) var(--ease);
}

.page-about .next-item:hover {
  background: var(--ink-700);
}

.page-about .next-item .mono {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--amber);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
}

.page-about .next-item h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  color: var(--paper);
}

.page-about .next-item p {
  margin: 0;
  color: var(--mist);
  font-size: 0.87rem;
  line-height: 1.66;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 620px) {
  .page-about .about-cities {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .about-duo {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.75rem;
  }

  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .partner-card:nth-child(even) {
    margin-top: 1.75rem;
  }

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

@media (min-width: 860px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 0.85fr);
    align-items: end;
    gap: clamp(2rem, 5vw, 3.75rem);
  }
}

@media (min-width: 940px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: center;
  }

  .page-about .about-figure--solo {
    margin-top: 0;
  }
}

@media (min-width: 980px) {
  .page-about .about-tl-wrap {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .about-tl-wrap .about-figure {
    margin-top: 0;
  }

  .page-about .about-timeline .tl-item:nth-child(odd) {
    margin-right: clamp(0rem, 3.5vw, 2.25rem);
  }

  .page-about .about-timeline .tl-item:nth-child(even) {
    margin-left: clamp(0rem, 3.5vw, 2.25rem);
  }
}

@media (min-width: 1040px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(1.5rem, 3vw, 3rem);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 2rem;
    margin-bottom: 0;
  }

  .page-about .about-rail-list {
    flex-direction: column;
    gap: 0.1rem;
    overflow: visible;
  }

  .page-about .about-rail-list a {
    border: 0;
    border-left: 2px solid transparent;
    padding: 0.38rem 0 0.38rem 0.7rem;
    background: transparent;
  }

  .page-about .about-rail-list a:hover,
  .page-about .about-rail-list a:focus-visible {
    border-left-color: var(--signal);
    background: transparent;
  }

  .page-about .about-top {
    display: inline-block;
    margin-top: 1.35rem;
    font-size: 0.74rem;
    color: var(--mist);
    text-decoration: none;
    border-bottom: 1px solid var(--line);
    transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
  }

  .page-about .about-top:hover,
  .page-about .about-top:focus-visible {
    color: var(--signal-soft);
    border-color: var(--signal);
  }
}
<<<END>>>