.page-about {
  --about-rail: 190px;
  --about-gap: clamp(24px, 4vw, 56px);
  display: block;
  padding-block-start: clamp(84px, 11vw, 124px);
  padding-block-end: clamp(56px, 8vw, 96px);
  background: var(--field);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  margin-bottom: clamp(20px, 3vw, 34px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
  padding-bottom: clamp(36px, 6vw, 72px);
}

.page-about .about-hero__media {
  max-width: 460px;
}

.page-about .about-hero__caption {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

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

.page-about .about-hero__body h1 {
  margin: 14px 0 0;
  font-size: clamp(34px, 7vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
}

.page-about .about-hero__lead {
  max-width: 34em;
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: 32px 0 0;
  padding: 22px 20px;
  border: 2px solid var(--ink);
  border-radius: var(--r-card);
  background: var(--white);
  box-shadow: var(--shadow-hard);
}

.page-about .about-hero__facts .figure-num {
  min-width: 0;
}

.page-about .about-hero__facts dt {
  order: 2;
}

.page-about .about-hero__facts .figure-num__value {
  font-family: var(--font-num);
  font-size: clamp(34px, 6vw, 48px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--grass);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__facts .figure-num__unit {
  margin-left: 3px;
  font-size: 13px;
  font-weight: 400;
  color: var(--muted);
}

.page-about .about-hero__facts .figure-num__label {
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 索引 + 内容流 ---------- */
.page-about .about-layout {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-rail {
  min-width: 0;
  padding: 14px 0 6px;
  border-top: 3px solid var(--ink);
}

.page-about .about-rail__caption {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-rail__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 2px solid var(--line);
  border-radius: var(--r-pill);
  background: var(--white);
  color: var(--ink-2);
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.page-about .about-rail__link .index-rail__num {
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--muted);
}

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

.page-about .about-rail__link.is-current {
  border-color: var(--ink);
  background: var(--yellow);
  color: var(--ink);
}

.page-about .about-rail__link.is-current .index-rail__num {
  color: var(--ink);
}

/* ---------- 内容区块 ---------- */
.page-about .about-flow {
  display: grid;
  gap: clamp(52px, 8vw, 96px);
  min-width: 0;
}

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

.page-about .about-block .section-head {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-block .section-head__title {
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 800;
}

.page-about .about-block .section-head__note {
  max-width: 40em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  padding: 8px 0 0;
}

.page-about .about-timeline__line {
  display: none;
  width: 100%;
  height: 150px;
  margin-bottom: -86px;
}

.page-about .about-timeline__nodes {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: tl;
}

.page-about .tl-node {
  position: relative;
  padding: 20px 18px 20px 22px;
  border: 2px solid var(--ink);
  border-left: 8px solid var(--grass);
  border-radius: var(--r-card);
  background: var(--white);
  box-shadow: var(--shadow-soft);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-left-color 0.2s ease;
}

.page-about .tl-node:nth-child(3) {
  border-left-color: var(--red);
}

.page-about .tl-node__year {
  display: block;
  font-family: var(--font-num);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .tl-node__title {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .tl-node__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-2);
}

.page-about .tl-node__pop {
  margin: 12px 0 0;
  padding: 7px 12px;
  border-radius: 6px;
  background: var(--line);
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-2);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.page-about .tl-node:hover,
.page-about .tl-node:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}

.page-about .tl-node:hover .tl-node__pop,
.page-about .tl-node:focus-visible .tl-node__pop {
  background: var(--yellow);
  color: var(--ink);
}

.page-about .about-timeline__media {
  margin-top: clamp(28px, 4vw, 44px);
}

/* ---------- 团队与流程 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
  align-items: start;
}

.page-about .about-team__lead {
  max-width: 34em;
  margin: 0 0 26px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-2);
}

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

.page-about .flow-step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 6px 16px;
  padding: 16px 16px 16px 14px;
  border: 2px solid var(--line);
  border-radius: var(--r-card);
  background: var(--white);
}

.page-about .flow-step__num {
  grid-row: 1 / span 2;
  font-family: var(--font-num);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--grass);
  font-variant-numeric: tabular-nums;
}

.page-about .flow-step__title {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
}

.page-about .flow-step__text {
  grid-column: 2;
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-2);
}

.page-about .quote-note {
  position: relative;
  margin: 0;
  padding: 24px 22px;
}

.page-about .quote-note::before {
  content: "“";
  position: absolute;
  top: -6px;
  left: 14px;
  font-family: var(--font-num);
  font-size: 60px;
  line-height: 1;
  color: var(--yellow);
}

.page-about .quote-note .card__label {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--yellow);
}

.page-about .quote-note .card__body {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.85;
  color: var(--white);
}

/* ---------- 栏目矩阵 ---------- */
.page-about .about-columns {
  display: grid;
  gap: 16px;
}

.page-about .col-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  border: 2px solid var(--ink);
  border-radius: var(--r-card);
  background: var(--white);
  box-shadow: var(--shadow-soft);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .col-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}

.page-about .col-card__tag {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
}

.page-about .col-card__title {
  margin: 0;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .col-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .col-card__link {
  margin: auto 0 0;
  padding-top: 8px;
}

.page-about .col-card__link a {
  font-size: 13px;
  font-weight: 700;
  color: var(--grass);
  text-decoration: none;
  border-bottom: 2px solid var(--yellow);
}

.page-about .col-card__link a:hover,
.page-about .col-card__link a:focus-visible {
  color: var(--red);
}

.page-about .about-columns__foot {
  max-width: 46em;
  margin: 24px 0 0;
  padding-left: 16px;
  border-left: 4px solid var(--yellow);
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-2);
}

/* ---------- 纠错机制 ---------- */
.page-about .about-review {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
  align-items: start;
}

.page-about .review-steps {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 3px solid var(--ink);
}

.page-about .review-step {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .review-step__time {
  font-family: var(--font-num);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--red);
  font-variant-numeric: tabular-nums;
}

.page-about .review-step__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 800;
}

.page-about .review-step__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .about-review__cta {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .about-review__cta a {
  font-weight: 700;
  color: var(--grass);
  border-bottom: 2px solid var(--yellow);
  text-decoration: none;
}

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

.page-about .about-review__caption {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 覆盖范围 ---------- */
.page-about .coverage-grid {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  align-items: start;
}

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

.page-about .coverage-stat {
  padding: 16px 14px;
  border: 2px solid var(--ink);
  border-radius: var(--r-card);
  background: var(--ink);
  color: var(--white);
}

.page-about .coverage-stat__value {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(28px, 5vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--yellow);
  font-variant-numeric: tabular-nums;
}

.page-about .coverage-stat__value small {
  margin-left: 2px;
  font-size: 13px;
  font-weight: 400;
  color: var(--white);
}

.page-about .coverage-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(244, 247, 241, 0.78);
}

.page-about .coverage-partners {
  min-width: 0;
  padding: 24px 22px;
  border: 2px solid var(--ink);
  border-left: 8px solid var(--grass);
  border-radius: var(--r-card);
  background: var(--white);
  box-shadow: var(--shadow-soft);
}

.page-about .coverage-partners__title {
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 800;
}

.page-about .coverage-partners > p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .coverage-list {
  display: grid;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .coverage-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-2);
}

.page-about .coverage-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 10px;
  height: 10px;
  background: var(--yellow);
  border: 2px solid var(--ink);
}

.page-about .coverage-partners__foot {
  margin-top: 16px !important;
  font-size: 13px !important;
  color: var(--muted) !important;
}

.page-about .coverage-partners__foot a {
  font-weight: 700;
  color: var(--grass);
  text-decoration: none;
  border-bottom: 2px solid var(--yellow);
}

/* ---------- 团队构成 ---------- */
.page-about .team-mix {
  display: grid;
  gap: 12px;
  margin-bottom: 26px;
}

.page-about .mix-bar {
  padding: 18px 18px 18px 20px;
  border: 2px solid var(--ink);
  border-radius: var(--r-card);
  background: var(--white);
  box-shadow: var(--shadow-soft);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .mix-bar--tech {
  border-left: 10px solid var(--grass);
}

.page-about .mix-bar--data {
  border-left: 10px solid var(--yellow);
}

.page-about .mix-bar--ops {
  border-left: 10px solid var(--red);
}

.page-about .mix-bar:hover,
.page-about .mix-bar:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}

.page-about .mix-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 0;
}

.page-about .mix-bar__name {
  font-size: 16px;
  font-weight: 800;
}

.page-about .mix-bar__num {
  font-family: var(--font-num);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .mix-bar__duty {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

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

.page-about .rhythm-notes .note {
  margin: 0;
  padding: 16px 18px;
  border: 2px solid var(--line);
  border-radius: var(--r-card);
  background: var(--white);
  font-size: 13px;
  line-height: 1.85;
  color: var(--ink-2);
}

/* ---------- 收尾 ---------- */
.page-about .about-close__box {
  padding: clamp(24px, 4vw, 40px);
  border: 3px solid var(--ink);
  border-radius: var(--r-card);
  background: var(--grass);
  box-shadow: var(--shadow-hard);
  color: var(--white);
}

.page-about .about-close__title {
  margin: 0 0 18px;
  font-size: clamp(20px, 3.6vw, 30px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-close__steps {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: close;
}

.page-about .about-close__steps li {
  position: relative;
  padding-left: 34px;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(244, 247, 241, 0.94);
  counter-increment: close;
}

.page-about .about-close__steps li::before {
  content: counter(close, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 700;
  color: var(--yellow);
}

.page-about .about-close__steps a {
  color: var(--white);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--yellow);
}

.page-about .about-close__steps a:hover,
.page-about .about-close__steps a:focus-visible {
  color: var(--yellow);
}

/* ---------- 焦点可见 ---------- */
.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .review-step {
    grid-template-columns: 150px minmax(0, 1fr);
    align-items: start;
    gap: 20px;
  }
}

@media (min-width: 760px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 5fr) minmax(0, 8fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-hero__facts {
    padding: 26px 24px;
  }

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

  .page-about .about-timeline__nodes {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    align-items: start;
  }

  .page-about .tl-node:nth-child(1) { margin-top: 76px; }
  .page-about .tl-node:nth-child(2) { margin-top: 40px; }
  .page-about .tl-node:nth-child(3) { margin-top: 4px; }
  .page-about .tl-node:nth-child(4) { margin-top: 0; }

  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }

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

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

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

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 120px;
    padding-top: 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    gap: 8px;
  }

  .page-about .about-rail__link {
    width: 100%;
    justify-content: flex-start;
    border-radius: 10px;
    border-width: 0 0 0 3px;
    border-color: transparent;
    background: transparent;
    padding: 9px 12px;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: var(--line);
  }

  .page-about .about-rail__link.is-current {
    border-color: var(--ink);
    background: var(--yellow);
  }

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

  .page-about .about-team,
  .page-about .about-review {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: clamp(28px, 3vw, 48px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node,
  .page-about .col-card,
  .page-about .mix-bar {
    transition: none;
  }

  .page-about .tl-node:hover,
  .page-about .col-card:hover,
  .page-about .mix-bar:hover,
  .page-about .tl-node:focus-visible,
  .page-about .mix-bar:focus-visible {
    transform: none;
  }
}
<<<END>>>