.page-about {
  --about-rule-dark: rgba(154, 166, 160, .22);
  --about-rule-light: rgba(20, 24, 26, .16);
  --about-ink-soft: #59635D;
}

/* ---------- 章节标题组件 ---------- */
.page-about .sec-head {
  max-width: 68ch;
}

.page-about .sec-head__lede {
  margin-top: 14px;
}

.page-about .section--paper .sec-head .lede,
.page-about .section--paper .sec-head__lede {
  color: var(--about-ink-soft);
}

.page-about .section--ice .sec-head .lede,
.page-about .section--ice .sec-head__lede {
  color: var(--about-ink-soft);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(40px, 6vw, 92px) clamp(44px, 5vw, 80px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -10%;
  bottom: -34%;
  width: 44%;
  height: 128%;
  background: var(--ink-800);
  opacity: .62;
  transform: skewX(-8deg);
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 56px);
  margin-top: clamp(22px, 3.5vw, 44px);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(250px, 3fr);
    align-items: end;
  }
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(40px, 8vw, 112px);
  line-height: .94;
  letter-spacing: -.02em;
  margin: 18px 0 0;
  color: var(--ice);
  text-transform: none;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--lime);
}

.page-about .about-hero__lede {
  margin-top: clamp(18px, 2.4vw, 30px);
  max-width: 60ch;
}

.page-about .index-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-rule-dark);
}

.page-about .index-list li {
  border-bottom: 1px solid var(--about-rule-dark);
}

.page-about .index-list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 2px;
  color: var(--ice);
  text-decoration: none;
  font-size: .9rem;
  line-height: 1.5;
  transition: color .15s var(--ease), padding-left .15s var(--ease);
}

.page-about .index-list a .num {
  font-size: .72rem;
  color: var(--mist);
  transition: color .15s var(--ease);
}

.page-about .index-list a:hover,
.page-about .index-list a:focus-visible {
  color: var(--lime);
  padding-left: 6px;
}

.page-about .index-list a:hover .num,
.page-about .index-list a:focus-visible .num {
  color: var(--lime);
}

/* ---------- 时间轴 ---------- */
.page-about .about-seasons {
  background: var(--ink-900);
  padding-block: clamp(40px, 5vw, 76px) clamp(48px, 6vw, 88px);
}

.page-about .timeline {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0 0 14px;
  display: flex;
  gap: 0;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  border-top: 1px solid var(--line);
  scrollbar-width: thin;
  scrollbar-color: var(--ink-700) transparent;
}

.page-about .timeline::-webkit-scrollbar {
  height: 4px;
}

.page-about .timeline::-webkit-scrollbar-thumb {
  background: var(--ink-700);
}

.page-about .timeline__item {
  position: relative;
  flex: 0 0 clamp(212px, 24vw, 288px);
  scroll-snap-align: start;
  padding: 26px 20px 12px 0;
  border-right: 1px solid var(--about-rule-dark);
}

.page-about .timeline__item:not(:first-child) {
  padding-left: 20px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 36px;
  height: 2px;
  background: var(--mist);
  transition: width .22s var(--ease), background-color .22s var(--ease);
}

.page-about .timeline__item:hover::before,
.page-about .timeline__item:focus-within::before {
  width: 100%;
  background: var(--lime);
}

.page-about .timeline__no {
  display: block;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--mist);
  letter-spacing: .08em;
  transition: color .18s var(--ease);
}

.page-about .timeline__item:hover .timeline__no {
  color: var(--lime);
}

.page-about .timeline__title {
  margin: 14px 0 0;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--ice);
  letter-spacing: .02em;
}

.page-about .timeline__desc {
  margin: 10px 0 0;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 三件事 ---------- */
.page-about .about-principles {
  color: var(--graphite);
}

.page-about .about-principles__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 60px);
}

@media (min-width: 960px) {
  .page-about .about-principles__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }

  .page-about .sec-head--sticky {
    position: sticky;
    top: calc(var(--rail-h) + 76px);
    align-self: start;
  }
}

.page-about .about-principles .eyebrow {
  color: var(--about-ink-soft);
}

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

.page-about .pillar {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  column-gap: 16px;
  border-top: 1px solid var(--about-rule-light);
  padding: 24px 0 28px;
}

.page-about .pillar:last-child {
  border-bottom: 1px solid var(--about-rule-light);
}

.page-about .pillar__no {
  grid-row: 1 / span 3;
  font-size: 1.35rem;
  line-height: 1.2;
  color: var(--ink-700);
  letter-spacing: .06em;
}

.page-about .pillar__title {
  grid-column: 2;
  margin: 0;
  font-size: 1.14rem;
  font-weight: 700;
  letter-spacing: .01em;
}

.page-about .pillar__text {
  grid-column: 2;
  margin: 10px 0 0;
  font-size: .95rem;
  line-height: 1.78;
  color: #3A423E;
  max-width: 62ch;
}

.page-about .pillar__stat {
  grid-column: 2;
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 14px 0 0;
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--about-ink-soft);
}

.page-about .pillar__stat .num {
  font-size: 1.32rem;
  color: var(--ink-800);
  letter-spacing: .04em;
}

/* ---------- 流程 ---------- */
.page-about .about-workflow {
  background: var(--ink-900);
  padding-block: clamp(44px, 5vw, 84px);
}

.page-about .workflow-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  margin-top: clamp(28px, 4vw, 48px);
}

@media (min-width: 960px) {
  .page-about .workflow-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .workflow-media {
    position: sticky;
    top: calc(var(--rail-h) + 76px);
    margin: 0;
  }
}

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

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

.page-about .flow__step {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  column-gap: 16px;
  padding: 22px 0;
  border-top: 1px solid var(--about-rule-dark);
}

.page-about .flow__step:first-child {
  border-top-color: var(--line);
}

.page-about .flow__no {
  font-size: 1.1rem;
  line-height: 1.6;
  color: var(--ink-700);
  letter-spacing: .08em;
}

.page-about .flow__title {
  margin: 0;
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: .02em;
}

.page-about .flow__text {
  margin: 8px 0 0;
  font-size: .93rem;
  line-height: 1.78;
  color: var(--mist);
  max-width: 60ch;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  color: var(--graphite);
}

.page-about .about-team .eyebrow {
  color: var(--about-ink-soft);
}

.page-about .team-media {
  margin: clamp(26px, 3.5vw, 44px) 0 0;
}

.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-rule-light);
  border: 1px solid var(--about-rule-light);
  margin-top: clamp(26px, 3.5vw, 42px);
}

@media (min-width: 760px) {
  .page-about .team-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .team-stats .stat {
  background: var(--paper);
  padding: 22px 18px 24px;
}

.page-about .team-stats .stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 3.4vw, 2.6rem);
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--ink-800);
  line-height: 1;
}

.page-about .team-stats .stat-label {
  display: block;
  margin-top: 10px;
  font-size: .76rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--about-ink-soft);
}

.page-about .team-note {
  margin: clamp(22px, 3vw, 34px) 0 0;
  max-width: 68ch;
  font-size: .95rem;
  line-height: 1.8;
  color: #3A423E;
}

/* ---------- 服务网络 ---------- */
.page-about .network {
  margin-top: clamp(32px, 4vw, 56px);
  padding: clamp(22px, 3vw, 40px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 44px);
}

@media (min-width: 940px) {
  .page-about .network {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }
}

.page-about .network__title {
  margin: 12px 0 0;
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  font-weight: 700;
  color: var(--ice);
  letter-spacing: .01em;
  line-height: 1.4;
}

.page-about .network__intro {
  margin: 12px 0 0;
  font-size: .92rem;
  line-height: 1.78;
  color: var(--mist);
  max-width: 46ch;
}

.page-about .network__map {
  margin-top: 22px;
}

.page-about .netmap {
  display: block;
  width: 100%;
  height: auto;
  color: var(--line);
}

.page-about .netmap__nodes circle {
  fill: var(--lime);
}

.page-about .netmap__labels text {
  fill: var(--ice);
  font-family: var(--font-body);
  font-size: 15px;
  letter-spacing: .06em;
}

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

.page-about .network__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 14px 0;
  border-top: 1px solid var(--about-rule-dark);
}

.page-about .network__item:last-child {
  border-bottom: 1px solid var(--about-rule-dark);
}

.page-about .network__city {
  font-family: var(--font-mono);
  font-size: .92rem;
  letter-spacing: .14em;
  color: var(--lime);
}

.page-about .network__duty {
  font-size: .88rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 合作机构 ---------- */
.page-about .about-partners {
  background: var(--ink-900);
  padding-block: clamp(44px, 5vw, 84px);
}

.page-about .partners-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(28px, 4vw, 46px);
}

@media (min-width: 960px) {
  .page-about .partners-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
}

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

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

.page-about .partners-item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  column-gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--about-rule-dark);
}

.page-about .partners-item:last-child {
  border-bottom: 1px solid var(--about-rule-dark);
}

.page-about .partners-no {
  font-size: 1.4rem;
  line-height: 1.2;
  color: var(--lime);
  letter-spacing: .06em;
}

.page-about .partners-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ice);
  letter-spacing: .02em;
}

.page-about .partners-item p {
  margin: 8px 0 0;
  font-size: .89rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .partners-note {
  margin: 22px 0 0;
  font-size: .89rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .partners-note a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--ink-700);
  transition: border-color .15s var(--ease);
}

.page-about .partners-note a:hover,
.page-about .partners-note a:focus-visible {
  border-bottom-color: var(--lime);
}

/* ---------- 四个理由 ---------- */
.page-about .about-why {
  padding-block: clamp(44px, 5vw, 84px);
  color: var(--graphite);
}

.page-about .about-why .eyebrow {
  color: var(--about-ink-soft);
}

.page-about .about-why .lede a {
  color: var(--ink-800);
  text-decoration: none;
  border-bottom: 1px solid rgba(20, 24, 26, .35);
}

.page-about .about-why .lede a:hover,
.page-about .about-why .lede a:focus-visible {
  border-bottom-color: var(--ink-800);
}

.page-about .why__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 48px);
}

.page-about .why__head {
  max-width: 62ch;
}

.page-about .reason-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  column-gap: clamp(24px, 4vw, 56px);
}

@media (min-width: 720px) {
  .page-about .reason-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .reason {
  padding: 22px 0 26px;
  border-top: 1px solid var(--about-rule-light);
}

.page-about .reason__no {
  display: block;
  font-size: 1.25rem;
  line-height: 1;
  color: var(--ink-700);
  letter-spacing: .08em;
}

.page-about .reason__title {
  margin: 12px 0 0;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .01em;
}

.page-about .reason__text {
  margin: 9px 0 0;
  font-size: .92rem;
  line-height: 1.76;
  color: #3A423E;
  max-width: 40ch;
}

.page-about .why__footer {
  margin-top: clamp(18px, 2.5vw, 30px);
  padding-top: 22px;
  border-top: 1px solid var(--about-rule-light);
}

.page-about .why__footer-text {
  margin: 0;
  max-width: 70ch;
  font-size: .95rem;
  line-height: 1.8;
  color: #3A423E;
}

.page-about .why__footer-text a {
  color: var(--ink-800);
  font-weight: 500;
  text-decoration: none;
  border-bottom: 1px solid rgba(20, 24, 26, .35);
}

.page-about .why__footer-text a:hover,
.page-about .why__footer-text a:focus-visible {
  border-bottom-color: var(--ink-800);
}

/* ---------- 窄屏收口 ---------- */
@media (max-width: 560px) {
  .page-about .about-hero::after {
    width: 62%;
    right: -22%;
    opacity: .45;
  }

  .page-about .pillar,
  .page-about .flow__step,
  .page-about .partners-item {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 8px;
  }

  .page-about .pillar__no,
  .page-about .pillar__title,
  .page-about .pillar__text,
  .page-about .pillar__stat {
    grid-column: 1;
  }

  .page-about .pillar__no {
    grid-row: auto;
  }

  .page-about .timeline__item,
  .page-about .timeline__item:not(:first-child) {
    flex-basis: 80vw;
    padding-left: 0;
    padding-right: 18px;
  }
}
<<<END>>>