.page-about {
  --about-rule: 1px solid var(--grey);
  --about-rule-strong: 2px solid var(--ink);
  padding-bottom: 64px;
  color: var(--ink);
  font-family: var(--font-sans);
}

.page-about .breadcrumb {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 26px;
  padding: 26px 0 34px;
  border-bottom: var(--about-rule-strong);
}

.page-about .about-hero__kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  font-size: clamp(34px, 9vw, 84px);
  font-weight: 300;
  line-height: 1.04;
  letter-spacing: -0.02em;
  max-width: 12em;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-hero__side {
  background: var(--navy);
  color: var(--paper);
  border: var(--about-rule-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow-2);
  padding: 16px 20px;
}

.page-about .about-stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid rgba(246, 241, 230, 0.24);
}

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

.page-about .about-stat__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-about .about-stat__label {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(246, 241, 230, 0.82);
}

/* ---------- 主布局 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 20px;
  padding-top: 20px;
}

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

/* ---------- 章节索引 ---------- */
.page-about .about-toc {
  border-top: var(--about-rule-strong);
  padding-top: 12px;
}

.page-about .about-toc .toc__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
}

.page-about .about-toc .toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  padding: 6px 10px;
  border: 2px solid var(--grey);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--ink);
  font-size: 13px;
  text-decoration: none;
  transition: border-color 140ms ease, background-color 140ms ease;
}

.page-about .about-toc__link .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  border-color: var(--orange);
}

.page-about .about-toc__link[data-active="true"] {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--white);
}

.page-about .about-toc__link[data-active="true"] .mono {
  color: var(--white);
}

/* ---------- 章节通用 ---------- */
.page-about .chapter {
  margin-top: 28px;
  padding-top: 30px;
  border-top: var(--about-rule-strong);
}

.page-about .chapter__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
}

.page-about .chapter__head .section__index {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--orange);
  letter-spacing: 0.04em;
}

.page-about .chapter__head .section__title {
  margin: 0;
  font-size: clamp(22px, 5vw, 32px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-about .chapter__lede {
  margin: 0 0 16px;
  max-width: 30em;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.6;
}

.page-about .chapter p {
  margin: 0 0 16px;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .chapter p a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: var(--grey);
}

.page-about .chapter p a:hover {
  color: var(--orange);
  text-decoration-thickness: 2px;
  text-decoration-color: var(--orange);
}

/* ---------- 要点列表 ---------- */
.page-about .about-points {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-point {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: var(--about-rule);
}

.page-about .about-point:first-child {
  border-top: var(--about-rule-strong);
}

.page-about .about-point__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--orange);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 12px;
}

.page-about .about-point__title {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .about-point__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 测绘四步 ---------- */
.page-about .about-method {
  display: grid;
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-method__item {
  padding: 14px 14px 16px;
  background: var(--white);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  transition: box-shadow 140ms ease, border-color 140ms ease;
}

.page-about .about-method__item:hover {
  box-shadow: var(--shadow-2);
  border-color: var(--orange);
}

.page-about .about-method__step {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .about-method__title {
  margin: 6px 0 6px;
  font-size: 16px;
  font-weight: 700;
}

.page-about .about-method__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 图注 ---------- */
.page-about .about-shot {
  margin: 26px 0 20px;
}

.page-about .about-shot img {
  display: block;
  width: 100%;
  height: auto;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background: var(--white);
}

.page-about .about-shot figcaption {
  display: flex;
  gap: 10px;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-soft);
}

.page-about .about-shot__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  color: var(--orange);
  letter-spacing: 0.04em;
}

/* ---------- 引言块 ---------- */
.page-about .about-quote {
  margin: 34px 0;
  padding: 26px 20px;
  background: var(--mint);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-2);
  text-align: right;
}

.page-about .about-quote__index {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--navy-2);
}

.page-about .about-quote__text {
  margin: 0;
  font-size: clamp(23px, 5vw, 40px);
  font-weight: 300;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--navy);
}

/* ---------- 三道校订 ---------- */
.page-about .about-gates {
  display: grid;
  gap: 14px;
  margin: 22px 0 0;
}

.page-about .about-gate {
  background: var(--white);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}

.page-about .about-gate__bar {
  height: 8px;
  background: var(--orange);
}

.page-about .about-gate:nth-child(2) .about-gate__bar {
  background: var(--navy);
}

.page-about .about-gate:nth-child(3) .about-gate__bar {
  background: var(--green);
}

.page-about .about-gate__body {
  padding: 14px 16px 18px;
}

.page-about .about-gate__step {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-gate__title {
  margin: 6px 0 8px;
  font-size: 17px;
  font-weight: 700;
}

.page-about .about-gate__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-soft);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 18px;
  margin-top: 20px;
}

.page-about .about-team__badge {
  background: var(--navy);
  color: var(--paper);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  padding: 18px 20px;
}

.page-about .about-team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 48px;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-team__unit {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(246, 241, 230, 0.82);
}

.page-about .about-team__row {
  padding: 14px 0;
  border-top: var(--about-rule);
}

.page-about .about-team__row:first-child {
  border-top: var(--about-rule-strong);
}

.page-about .about-team__name {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
}

.page-about .about-team__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-team__text a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: var(--grey);
}

.page-about .about-team__text a:hover {
  color: var(--orange);
  text-decoration-color: var(--orange);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(210px, 1fr);
  gap: 12px;
  margin: 20px 0 18px;
  padding: 4px 2px 14px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x proximity;
}

.page-about .about-node {
  scroll-snap-align: start;
  padding: 14px 15px;
  background: var(--white);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  transition: box-shadow 140ms ease, border-color 140ms ease;
}

.page-about .about-node:hover {
  border-color: var(--orange);
  box-shadow: var(--shadow-2);
}

.page-about .about-node__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .about-node__title {
  margin: 8px 0 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.45;
}

.page-about .about-node__detail {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-soft);
}

/* ---------- 服务准则 ---------- */
.page-about .about-rules {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rule {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: var(--about-rule);
}

.page-about .about-rule:first-child {
  border-top: var(--about-rule-strong);
}

.page-about .about-rule__num {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--orange);
}

.page-about .about-rule__title {
  margin: 0 0 5px;
  font-size: 16px;
  font-weight: 700;
}

.page-about .about-rule__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-next {
  margin-top: 40px;
  padding: 20px 18px;
  background: var(--navy);
  color: var(--paper);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-2);
}

.page-about .about-next__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

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

.page-about .about-next__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid rgba(246, 241, 230, 0.22);
  color: var(--paper);
  font-size: 15px;
  text-decoration: none;
  transition: color 140ms ease;
}

.page-about .about-next__list li:first-child .about-next__link {
  border-top: 0;
}

.page-about .about-next__link:hover {
  color: var(--orange);
}

.page-about .about-next__arrow {
  font-family: var(--font-mono);
  color: var(--orange);
}

/* ---------- 显现 ---------- */
.page-about [data-reveal="pending"] {
  opacity: 0;
}

.page-about [data-reveal="done"] {
  opacity: 1;
  transition: opacity 240ms ease;
}

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

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

  .page-about .about-gate:nth-child(2) {
    margin-top: 22px;
  }

  .page-about .about-gate:nth-child(3) {
    margin-top: 44px;
  }

  .page-about .about-team {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }

  .page-about .chapter__lede {
    font-size: 19px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about {
    padding-bottom: 88px;
  }

  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: end;
    gap: 40px;
    padding: 40px 0 52px;
  }

  .page-about .about-hero__side {
    padding: 20px 24px;
  }

  .page-about .about-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
    padding-top: 26px;
  }

  .page-about .about-toc {
    position: sticky;
    top: 92px;
    border-top: var(--about-rule-strong);
  }

  .page-about .about-toc .toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc__link {
    border: 0;
    border-left: 3px solid var(--grey);
    border-radius: 0;
    background: transparent;
    padding: 7px 10px;
  }

  .page-about .about-toc__link:hover {
    border-left-color: var(--orange);
    background: var(--orange-soft);
  }

  .page-about .about-toc__link[data-active="true"] {
    background: var(--orange-soft);
    border-left-color: var(--orange);
    color: var(--ink);
  }

  .page-about .about-toc__link[data-active="true"] .mono {
    color: var(--orange);
  }

  .page-about .chapter {
    margin-top: 34px;
    padding-top: 34px;
  }

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

  .page-about .about-quote {
    margin: 40px 0;
    padding: 34px 32px;
  }

  .page-about .about-timeline {
    grid-auto-columns: minmax(0, 1fr);
    overflow: visible;
    padding-bottom: 6px;
  }

  .page-about .about-node {
    min-height: 118px;
  }

  .page-about .about-node__detail {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 180ms ease, opacity 180ms ease, margin-top 180ms ease;
  }

  .page-about .about-node:hover .about-node__detail,
  .page-about .about-node:focus-within .about-node__detail {
    max-height: 130px;
    margin-top: 8px;
    opacity: 1;
  }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal="pending"] {
    opacity: 1;
  }

  .page-about [data-reveal="done"] {
    transition: none;
  }

  .page-about .about-method__item,
  .page-about .about-node,
  .page-about .about-toc__link,
  .page-about .about-next__link {
    transition: none;
  }

  .page-about .about-node__detail {
    transition: none;
  }
}
<<<END>>>