.page-about {
  --about-rail: 88px;
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ---------- 通用章节头 ---------- */
.page-about .about-section {
  padding-top: clamp(44px, 7vw, 88px);
}

.page-about .sec-head {
  max-width: 760px;
  margin-bottom: clamp(22px, 3.4vw, 40px);
}

.page-about .sec-head__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .sec-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.6vw, 40px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .sec-head__sub {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fog);
  max-width: 42em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 4.5vw, 52px) 0 clamp(32px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(ellipse at 78% 0%, rgba(69, 242, 206, .10), transparent 58%),
    linear-gradient(180deg, rgba(15, 46, 38, .55), transparent 72%);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 3vw, 32px);
}

.page-about .about-hero__rail {
  display: none;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .34em;
  color: var(--fog);
  writing-mode: vertical-rl;
  text-orientation: mixed;
  line-height: 1.7;
  border-left: 1px solid var(--line-cyan);
  padding-left: 14px;
  justify-self: start;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--fog);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 66px);
  line-height: 1.07;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 15em;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(243, 248, 245, .8);
  max-width: 40em;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 12px;
  margin-top: clamp(24px, 3.4vw, 38px);
  padding-top: clamp(18px, 2.6vw, 26px);
  border-top: 1px solid var(--line);
}

.page-about .hstat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .hstat__num {
  font-family: var(--font-num);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4.6vw, 48px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .hstat__lab {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--fog);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__fig {
  margin-bottom: clamp(24px, 3.6vw, 42px);
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl__item {
  position: relative;
  margin-left: 6px;
  padding-left: 24px;
  padding-bottom: clamp(16px, 2.4vw, 26px);
  border-left: 1px solid var(--line);
}

.page-about .tl__item:last-child {
  padding-bottom: 0;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 10px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(69, 242, 206, .12);
}

.page-about .tl__node {
  border-radius: var(--r-md);
  transition: background .24s var(--ease);
}

.page-about .tl__node[open] {
  background: rgba(15, 46, 38, .72);
  box-shadow: inset 0 0 0 1px var(--line-soft);
}

.page-about .tl__sum {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 10px 12px;
  list-style: none;
  cursor: pointer;
  border-radius: var(--r-md);
}

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

.page-about .tl__year {
  font-family: var(--font-num);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .tl__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
}

.page-about .tl__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 2vw, 20px);
  color: var(--paper);
}

.page-about .tl__title::after {
  content: "+";
  display: inline-block;
  margin-left: 10px;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--fog);
  transition: color .2s var(--ease);
}

.page-about .tl__node[open] .tl__title::after {
  content: "−";
  color: var(--cyan);
}

.page-about .tl__sum:hover .tl__title::after {
  color: var(--cyan);
}

.page-about .tl__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--fog);
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  padding: 2px 9px;
}

.page-about .tl__panel {
  padding: 0 12px 16px;
}

.page-about .tl__panel p {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 15px;
  line-height: 1.85;
  color: var(--fog);
  max-width: 42em;
}

/* ---------- 服务范围 ---------- */
.page-about .scope {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 42px);
}

.page-about .scope__text h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.6vw, 38px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .scope__lead {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fog);
  max-width: 40em;
}

.page-about .scope__list {
  list-style: none;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .scope__list li {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .scope__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .scope__val {
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .map-grid {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 5px;
  padding: clamp(12px, 2vw, 20px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(circle at 28% 18%, rgba(69, 242, 206, .12), transparent 62%),
    var(--pitch);
}

.page-about .map-cell {
  aspect-ratio: 1 / 1;
  border-radius: 4px;
  background: rgba(147, 175, 165, .1);
}

.page-about .map-cell.is-on {
  background: var(--cyan);
  opacity: .82;
  box-shadow: 0 0 7px rgba(69, 242, 206, .4);
}

.page-about .map-cell.is-on:nth-child(3n) {
  opacity: .5;
}

.page-about .map-cell.is-on:nth-child(5n) {
  opacity: .95;
}

.page-about .scope__fig {
  margin-top: clamp(14px, 2vw, 20px);
}

/* ---------- 团队与流程 ---------- */
.page-about .team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.6vw, 44px);
}

.page-about .team-bar {
  display: flex;
  height: 34px;
  border-radius: var(--r-pill);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .team-bar__seg {
  display: block;
  height: 100%;
  transition: filter .2s var(--ease);
}

.page-about .team-bar__seg--a { width: 38.7%; background: var(--cyan); }
.page-about .team-bar__seg--b { width: 22.6%; background: var(--mist); }
.page-about .team-bar__seg--c { width: 25.8%; background: var(--grid); }
.page-about .team-bar__seg--d { width: 12.9%; background: var(--orange); }

.page-about .team-bar__seg:hover {
  filter: brightness(1.18);
}

.page-about .legend {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 14px;
}

.page-about .legend__item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}

.page-about .legend__dot {
  width: 9px;
  height: 9px;
  border-radius: 2px;
  align-self: center;
  flex: none;
}

.page-about .legend__dot--a { background: var(--cyan); }
.page-about .legend__dot--b { background: var(--mist); }
.page-about .legend__dot--c { background: var(--grid); }
.page-about .legend__dot--d { background: var(--orange); }

.page-about .legend__num {
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 22px;
  line-height: 1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .legend__lab {
  font-size: 13px;
  color: var(--fog);
}

.page-about .team__note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--line-cyan);
  font-size: 14px;
  line-height: 1.8;
  color: var(--fog);
  max-width: 38em;
}

.page-about .team__flow-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .flow__step {
  position: relative;
  padding: 14px 16px 14px 18px;
  border-radius: var(--r-md);
  background: var(--pitch);
  border: 1px solid var(--line);
  border-left: 2px solid var(--grid);
}

.page-about .flow__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .flow__name {
  margin: 6px 0 4px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--paper);
}

.page-about .flow__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--fog);
}

.page-about .rhythm {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .rhythm__cell {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .rhythm__num {
  font-family: var(--font-num);
  font-weight: 600;
  font-size: clamp(24px, 3.2vw, 32px);
  line-height: 1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .rhythm__num em {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--fog);
  margin-left: 3px;
}

.page-about .rhythm__lab {
  font-size: 12px;
  line-height: 1.6;
  color: var(--fog);
}

.page-about .team__scale {
  margin: 18px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--fog);
  max-width: 40em;
}

.page-about .about-team__fig {
  margin-top: clamp(24px, 3.6vw, 40px);
}

/* ---------- 合作生态 ---------- */
.page-about .eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
}

.page-about .eco h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.6vw, 38px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .eco__lead {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fog);
  max-width: 40em;
}

.page-about .eco__types {
  list-style: none;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .eco__type {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 12px 16px;
  border-radius: var(--r-md);
  background: rgba(15, 46, 38, .7);
  border: 1px solid var(--line-soft);
}

.page-about .eco__type-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--paper);
}

.page-about .eco__type-desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--fog);
}

.page-about .eco__aside {
  padding: clamp(18px, 2.6vw, 26px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line-cyan);
  background:
    linear-gradient(160deg, rgba(69, 242, 206, .1), transparent 62%),
    var(--pitch);
}

.page-about .eco__aside-tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .eco__aside-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .eco__aside-meta {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  color: var(--fog);
}

/* ---------- 品质承诺 ---------- */
.page-about .promise {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .promise__card {
  position: relative;
  padding: clamp(18px, 2.6vw, 26px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--pitch);
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}

.page-about .promise__card:hover {
  border-color: var(--line-cyan);
  transform: translateY(-2px);
}

.page-about .promise__idx {
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 30px;
  line-height: 1;
  color: var(--grid);
}

.page-about .promise__name {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--paper);
}

.page-about .promise__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--fog);
}

/* ---------- 末尾引导 ---------- */
.page-about .cta {
  margin-top: clamp(24px, 4vw, 44px);
  padding: clamp(22px, 3.4vw, 36px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line-cyan);
  background:
    radial-gradient(ellipse at 12% 0%, rgba(69, 242, 206, .14), transparent 60%),
    var(--pitch);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.6vw, 28px);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .cta__sub {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--fog);
  max-width: 36em;
}

.page-about .cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: start;
}

.page-about .cta__actions .btn {
  flex: 1 1 auto;
  justify-content: center;
  text-align: center;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .eco__type {
    grid-template-columns: minmax(0, 180px) minmax(0, 1fr);
    align-items: baseline;
    gap: 12px;
  }

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

  .page-about .cta__actions {
    flex-direction: column;
    flex-wrap: nowrap;
  }

  .page-about .cta__actions .btn {
    flex: none;
    min-width: 190px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 28px;
  }

  .page-about .about-hero__rail {
    display: block;
  }

  .page-about .tl__sum {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
    padding: 10px 16px;
  }

  .page-about .tl__item {
    padding-left: 30px;
  }

  .page-about .scope {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }

  .page-about .team {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    align-items: start;
  }

  .page-about .eco {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    align-items: start;
  }

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

@media (min-width: 1180px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .rhythm {
    gap: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .promise__card,
  .page-about .team-bar__seg,
  .page-about .tl__node,
  .page-about .tl__title::after {
    transition: none;
  }
}
<<<END>>>