.page-about {
  --about-title-lg: clamp(2.1rem, 5.4vw, 4.4rem);
  --about-rail-pad: 64px;
  --about-rail-left: 26px;
  display: block;
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-rail-wrap {
  position: relative;
  width: 100%;
  max-width: var(--sheet);
  margin-inline: auto;
  padding-inline: var(--pad-x);
  padding-block-end: clamp(24px, 4vw, 48px);
}

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

/* ── 刊头 ───────────────────────────── */
.page-about .about-head {
  padding-block: clamp(18px, 3vw, 36px) clamp(36px, 5vw, 64px);
  border-bottom: 1px solid var(--ink-14);
}

.page-about .about-head .crumbs {
  margin-bottom: clamp(26px, 4vw, 52px);
}

.page-about .about-head__intro {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--about-title-lg);
  line-height: 1.05;
  letter-spacing: -0.012em;
  color: var(--ink);
}

.page-about .about-head__aside {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .about-head__aside .lede {
  margin: 0;
  color: var(--ink-70);
}

.page-about .about-head__meta {
  position: relative;
  margin: 0;
  padding-left: 22px;
  font-size: var(--step-caption);
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-head__meta::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 13px;
  height: 1px;
  background: var(--turq);
}

/* ── 规模数字 ───────────────────────── */
.page-about .about-figures {
  list-style: none;
  margin: clamp(30px, 4vw, 54px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-14);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-figure {
  display: grid;
  gap: 6px;
  background: var(--paper);
  padding: clamp(16px, 2vw, 26px);
}

.page-about .about-figure__num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.6vw, 1.95rem);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--deep);
}

.page-about .about-figure__key {
  font-size: var(--step-caption);
  line-height: 1.5;
  color: var(--slate);
}

/* ── 通用区块 ───────────────────────── */
.page-about .about-block {
  position: relative;
  padding-block: clamp(56px, 7vw, 104px);
}

.page-about .about-block::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 48px;
  height: 1px;
  background: var(--ink-45);
}

.page-about .about-head + .about-block::before {
  display: none;
}

.page-about .about-block__grid {
  display: grid;
  gap: clamp(28px, 3.5vw, 48px);
}

.page-about .about-block__lead {
  min-width: 0;
}

.page-about .about-block__title {
  margin: 0 0 clamp(16px, 2vw, 24px);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-h2);
  line-height: 1.2;
  letter-spacing: -0.005em;
  color: var(--ink);
}

.page-about .about-block__lead .prose {
  margin: 0 0 0.9em;
  max-width: 44em;
}

.page-about .about-block__lead .prose:last-child {
  margin-bottom: 0;
}

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

.page-about .about-block__banner {
  margin-top: clamp(26px, 3.4vw, 44px);
}

/* ── 协同步骤 ───────────────────────── */
.page-about .about-steps {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: clamp(12px, 2vw, 24px);
  padding-block: clamp(18px, 2.2vw, 26px);
  border-bottom: 1px solid var(--ink-08);
}

.page-about .about-step:first-child {
  border-top: 1px solid var(--ink-08);
}

.page-about .about-step__num {
  padding-top: 0.4em;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  color: var(--turq);
}

.page-about .about-step__name {
  margin: 0 0 6px;
  font-size: var(--step-body);
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-step__text {
  margin: 0;
  max-width: 42em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink-70);
}

/* ── 四地服务点 ─────────────────────── */
.page-about .about-cities {
  list-style: none;
  margin: clamp(26px, 3.4vw, 44px) 0 0;
  padding: 0;
}

.page-about .about-city {
  display: grid;
  gap: 6px;
  padding: clamp(18px, 2.4vw, 26px) clamp(12px, 1.6vw, 20px);
  border-bottom: 1px solid var(--ink-08);
  border-radius: var(--r-md);
  transition: background-color 180ms ease;
}

.page-about .about-city:first-child {
  border-top: 1px solid var(--ink-08);
}

.page-about .about-city:hover,
.page-about .about-city:focus-within {
  background: var(--ink-08);
}

.page-about .about-city__mark {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  line-height: 1;
  color: var(--deep);
}

.page-about .about-city__focus {
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--turq);
}

.page-about .about-city__note {
  font-size: 1rem;
  line-height: 1.78;
  color: var(--ink-70);
}

.page-about .about-note {
  position: relative;
  margin: clamp(20px, 2.4vw, 32px) 0 0;
  padding-left: 26px;
  font-size: var(--step-caption);
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-note::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 16px;
  height: 1px;
  background: var(--slate);
}

/* ── 团队角色切换 ───────────────────── */
.page-about .about-team {
  margin-top: clamp(26px, 3.4vw, 44px);
}

.page-about .about-team .tabs__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(24px, 3vw, 38px);
}

.page-about .about-team .tabs__tab {
  appearance: none;
  border: 1px solid var(--ink-14);
  background: transparent;
  color: var(--ink-70);
  font: inherit;
  font-size: 1rem;
  padding: 10px 22px;
  border-radius: var(--r-pill);
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}

.page-about .about-team .tabs__tab:hover {
  border-color: var(--ink-45);
  color: var(--ink);
}

.page-about .about-team .tabs__tab[aria-selected="true"] {
  background: var(--deep);
  border-color: var(--deep);
  color: var(--paper-white);
}

.page-about .about-role {
  display: grid;
  gap: clamp(18px, 2.4vw, 32px);
}

.page-about .about-role__metric {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0;
}

.page-about .about-role__num {
  font-family: var(--font-mono);
  font-size: clamp(2.6rem, 6vw, 4rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--deep);
}

.page-about .about-role__unit {
  font-size: var(--step-caption);
  color: var(--slate);
}

.page-about .about-role__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-role__list li {
  position: relative;
  padding-left: 26px;
  font-size: 1rem;
  line-height: 1.82;
  color: var(--ink-70);
}

.page-about .about-role__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 14px;
  height: 2px;
  background: var(--signal);
}

/* ── 交付检查 ───────────────────────── */
.page-about .about-checks {
  list-style: none;
  margin: clamp(26px, 3.4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ink-14);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-check {
  background: var(--paper-white);
  padding: clamp(20px, 2.6vw, 32px);
}

.page-about .about-check__k {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--signal);
}

.page-about .about-check__v {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink-70);
}

/* ── 时间线 ─────────────────────────── */
.page-about .about-block--timeline .about-block__title {
  font-size: var(--step-h1);
}

.page-about .about-timeline {
  margin-top: clamp(30px, 4vw, 52px);
}

.page-about .about-timeline__bar {
  display: flex;
  gap: clamp(18px, 4vw, 46px);
  border-bottom: 1px solid var(--ink-14);
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-timeline__node {
  position: relative;
  flex: 0 0 auto;
  padding: 12px 2px 16px;
  border: 0;
  background: none;
  font-family: var(--font-mono);
  font-size: 1rem;
  letter-spacing: 0.06em;
  color: var(--ink-45);
  cursor: pointer;
  transition: color 160ms ease;
}

.page-about .about-timeline__node::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  border-radius: var(--r-pill);
  background: transparent;
  transition: background-color 160ms ease;
}

.page-about .about-timeline__node:hover {
  color: var(--ink);
}

.page-about .about-timeline__node[aria-selected="true"] {
  color: var(--ink);
}

.page-about .about-timeline__node[aria-selected="true"]::after {
  background: var(--signal);
}

.page-about .about-timeline__panel {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
  padding-top: clamp(28px, 4vw, 48px);
}

.page-about .about-timeline__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--sand);
}

.page-about .about-timeline__panel .prose {
  margin: 0;
  max-width: 42em;
}

.page-about .about-timeline__figure {
  margin-top: clamp(40px, 5vw, 76px);
  max-width: 760px;
}

/* ── 收尾入口 ───────────────────────── */
.page-about .about-next {
  position: relative;
  padding-block: clamp(56px, 7vw, 100px) clamp(48px, 6vw, 96px);
}

.page-about .about-next::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 48px;
  height: 1px;
  background: var(--ink-45);
}

.page-about .about-next__panel {
  background: var(--deep);
  border-radius: var(--r-lg);
  padding: clamp(26px, 4vw, 56px);
  color: rgba(255, 255, 255, 0.8);
}

.page-about .about-next__title {
  margin: 0 0 clamp(20px, 3vw, 32px);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-h2);
  line-height: 1.2;
  color: var(--paper-white);
}

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

.page-about .about-next__item {
  display: grid;
  gap: 6px;
  padding-block: clamp(14px, 1.8vw, 20px);
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.page-about .about-next__item:last-child {
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
}

.page-about .about-next__link {
  width: fit-content;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  color: var(--paper-white);
  border-bottom-color: var(--lime);
}

.page-about .about-next__desc {
  font-size: 0.9375rem;
  line-height: 1.72;
}

/* ── 平板与桌面 ─────────────────────── */
@media (min-width: 640px) {
  .page-about .about-next__item {
    grid-template-columns: minmax(0, 150px) minmax(0, 1fr);
    align-items: baseline;
    gap: clamp(16px, 2vw, 32px);
  }

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

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

  .page-about .about-city {
    grid-template-columns: 72px 150px minmax(0, 1fr);
    align-items: center;
    gap: clamp(14px, 2.4vw, 32px);
  }

  .page-about .about-role {
    grid-template-columns: minmax(0, 3fr) minmax(0, 7fr);
    align-items: start;
    gap: clamp(24px, 3vw, 48px);
  }

  .page-about .about-timeline__panel {
    grid-template-columns: minmax(0, 4fr) minmax(0, 6fr);
    align-items: start;
    gap: clamp(24px, 3vw, 56px);
  }
}

@media (min-width: 900px) {
  .page-about .about-rail-wrap {
    padding-left: calc(var(--pad-x) + var(--about-rail-pad));
  }

  .page-about .about-rail {
    display: block;
    position: absolute;
    left: calc(var(--pad-x) + var(--about-rail-left));
    top: 0;
    bottom: clamp(24px, 4vw, 48px);
    width: 1px;
    background: var(--ink-14);
  }

  .page-about .about-rail::after {
    content: "";
    position: absolute;
    left: -9px;
    top: 0;
    bottom: 0;
    width: 9px;
    background: repeating-linear-gradient(
      to bottom,
      var(--ink-14) 0 1px,
      transparent 1px 26px
    );
  }

  .page-about .about-head__intro {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    align-items: end;
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-block__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    align-items: start;
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-block__side {
    margin-top: clamp(20px, 3vw, 48px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-city,
  .page-about .about-team .tabs__tab,
  .page-about .about-timeline__node,
  .page-about .about-timeline__node::after,
  .page-about .about-next__link {
    transition-duration: 0.01ms;
  }
}
<<<END>>>