.page-about {
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  padding-bottom: clamp(40px, 6vw, 72px);
}

.page-about .breadcrumb {
  padding-block: 14px 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 6px 0 clamp(28px, 5vw, 56px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-hero h1 {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-size: clamp(34px, 7.4vw, 76px);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--g-deep);
}

.page-about .about-hero h1 em {
  font-style: normal;
  background: linear-gradient(transparent 64%, var(--lime) 64%);
  padding: 0 2px;
}

.page-about .about-hero__intro {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(15px, 1.7vw, 17px);
  color: var(--ink-2);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  font-size: 13px;
  color: var(--ink-2);
}

.page-about .about-hero__facts .data {
  font-family: var(--font-data);
  font-size: 20px;
  font-weight: 600;
  color: var(--g-deep);
  margin-right: 5px;
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__board {
  position: relative;
  padding: clamp(22px, 4vw, 32px);
  color: var(--white);
  display: grid;
  align-content: start;
  gap: 4px;
}

.page-about .about-hero__board::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--g-deep);
  clip-path: polygon(0 0, 100% 4%, 100% 100%, 0 96%);
  z-index: 0;
}

.page-about .about-hero__board > * {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__board-title {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .about-hero__board-big {
  margin: 6px 0 0;
  font-family: var(--font-data);
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__board-sub {
  margin: 0;
  font-size: 13px;
  color: var(--grey-2);
}

.page-about .about-hero__board-list {
  margin: 18px 0 0;
  display: grid;
  gap: 0;
}

.page-about .about-hero__board-list > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-top: 1px solid var(--line-dark-soft);
}

.page-about .about-hero__board-list dt {
  font-size: 13px;
  color: var(--grey-2);
}

.page-about .about-hero__board-list dd {
  margin: 0;
  font-family: var(--font-data);
  font-size: 18px;
  font-weight: 600;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

/* ---------- 章节导视 ---------- */
.page-about .about-toc {
  background: var(--g-deep);
  border-top: 3px solid var(--lime);
  color: var(--white);
}

.page-about .about-toc__wrap {
  padding-inline: 0;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__list li {
  flex: 0 0 auto;
}

.page-about .about-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 13px 16px;
  font-size: 14px;
  color: var(--white);
  text-decoration: none;
  white-space: nowrap;
  border-right: 1px solid var(--line-dark-soft);
  transition: background var(--t), color var(--t);
}

.page-about .about-toc__list a .data {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--lime);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  background: var(--g-field);
  color: var(--lime);
}

/* ---------- 通用章节 ---------- */
.page-about .about-sec {
  padding: clamp(36px, 6vw, 72px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-sec--dark {
  background: var(--g-deep);
  color: var(--white);
  border-bottom-color: var(--line-dark-soft);
}

.page-about .about-sec--paper {
  background: var(--white);
}

.page-about .about-sec__head {
  max-width: 68ch;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-sec h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(26px, 4.6vw, 44px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--g-deep);
}

.page-about .about-sec--dark h2 {
  color: var(--white);
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--g-turf);
}

.page-about .about-sec--dark .eyebrow {
  color: var(--lime);
}

.page-about .about-sec__intro {
  margin: 0;
  font-size: 15.5px;
  color: var(--ink-2);
}

.page-about .about-sec--dark .about-sec__intro {
  color: var(--grey-2);
}

.page-about .about-sec__grid {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .about-sec__text p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 15.5px;
  color: var(--ink-2);
}

.page-about .about-sec__cta {
  margin-top: 8px;
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.94) contrast(1.03);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid var(--lime);
  font-size: 12px;
  line-height: 1.6;
  color: var(--grey);
}

/* ---------- S2 做法 ---------- */
.page-about .about-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .about-rules li {
  display: grid;
  grid-template-columns: 44px 1fr;
  column-gap: 12px;
  padding: 20px 0;
  border-top: 1px solid var(--line-dark-soft);
  transition: border-color var(--t);
}

.page-about .about-rules li:last-child {
  border-bottom: 1px solid var(--line-dark-soft);
}

.page-about .about-rules li:hover {
  border-top-color: var(--lime);
}

.page-about .about-rules__num {
  grid-row: 1 / span 2;
  padding-top: 5px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-rules h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.4vw, 23px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--white);
}

.page-about .about-rules p {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  color: var(--grey-2);
}

/* ---------- S3 覆盖 ---------- */
.page-about .about-reach {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .about-reach__chart {
  background: var(--g-field);
  border: 1px solid var(--g-deep);
  padding: clamp(16px, 3vw, 26px);
}

.page-about .stand {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .stand__tiers rect {
  fill: none;
  stroke: rgba(247, 248, 244, 0.38);
  stroke-width: 1.5;
}

.page-about .stand__core {
  fill: var(--lime);
  transition: fill var(--t);
}

.page-about .about-reach__chart:hover .stand__core {
  fill: var(--orange);
}

.page-about .stand__labels text {
  fill: rgba(247, 248, 244, 0.92);
  font-family: var(--font-body);
  font-size: 20px;
  letter-spacing: 0.02em;
}

.page-about .about-reach__stats {
  margin: 0;
  display: grid;
}

.page-about .about-reach__stats > div {
  display: grid;
  gap: 2px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-reach__stats > div:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-reach__stats dd {
  order: 1;
  margin: 0;
  font-family: var(--font-data);
  font-size: clamp(26px, 3.6vw, 34px);
  font-weight: 600;
  line-height: 1;
  color: var(--g-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .about-reach__stats dt {
  order: 2;
  font-size: 13.5px;
  color: var(--ink-2);
}

/* ---------- S4 团队 ---------- */
.page-about .about-team__roles {
  margin: 22px 0 0;
  display: grid;
}

.page-about .about-team__roles > div {
  display: grid;
  gap: 2px 14px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  align-items: baseline;
}

.page-about .about-team__roles > div:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__roles dt {
  font-family: var(--font-data);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--g-deep);
  letter-spacing: 0.02em;
}

.page-about .about-team__roles dd {
  margin: 0;
  font-size: 14px;
  color: var(--ink-2);
}

.page-about .about-flow {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-flow li {
  padding: 12px 0 0;
  border-top: 2px solid var(--g-field);
  font-size: 13px;
  color: var(--ink-2);
}

.page-about .about-flow .data {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-data);
  font-size: 15px;
  font-weight: 600;
  color: var(--g-deep);
  letter-spacing: 0.02em;
}

/* ---------- S5 节点 ---------- */
.page-about .about-banner {
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

.page-about .about-banner figcaption {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid var(--orange);
  font-size: 12px;
  color: var(--grey);
}

.page-about .about-timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 28px;
  border-left: 1px solid var(--line);
  display: grid;
  gap: 6px;
}

.page-about .tl {
  position: relative;
  padding: 6px 0 14px;
  outline-offset: 4px;
}

.page-about .tl__dot {
  position: absolute;
  left: -34px;
  top: 14px;
  width: 11px;
  height: 11px;
  border: 1.5px solid var(--g-field);
  border-radius: 50%;
  background: var(--cream);
  transition: background var(--t), border-color var(--t);
}

.page-about .tl:hover .tl__dot,
.page-about .tl:focus-within .tl__dot {
  background: var(--lime);
  border-color: var(--g-deep);
}

.page-about .tl__year {
  display: block;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--g-turf);
  font-variant-numeric: tabular-nums;
}

.page-about .tl h3 {
  margin: 5px 0 6px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 25px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--g-deep);
}

.page-about .tl p {
  margin: 0;
  max-width: 60ch;
  font-size: 14.5px;
  color: var(--ink-2);
}

.page-about .tl__note {
  height: 0;
  margin-top: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 13px;
  color: var(--g-turf);
  transition: opacity var(--t), margin-top var(--t);
}

.page-about .tl:hover .tl__note,
.page-about .tl:focus-within .tl__note {
  height: auto;
  margin-top: 8px;
  opacity: 1;
}

/* ---------- S6 共建 ---------- */
.page-about .about-community {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-map {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}

.page-about .about-map li {
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  background: var(--g-field);
  border: 1px solid var(--line-dark-soft);
  font-family: var(--font-data);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  color: var(--grey-2);
  transition: background var(--t), color var(--t), border-color var(--t);
}

.page-about .about-map li.is-core {
  background: var(--g-deep);
  border-color: rgba(216, 244, 60, 0.45);
  color: var(--lime);
}

.page-about .about-map:hover li.is-core {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--g-deep);
}

.page-about .about-map li.is-core:hover {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--g-deep);
}

.page-about .about-community__text p {
  margin: 0 0 18px;
  max-width: 58ch;
  font-size: 15px;
  color: var(--grey-2);
}

.page-about .about-community__list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-community__list li {
  padding: 12px 0;
  border-top: 1px solid var(--line-dark-soft);
  font-size: 14px;
  color: var(--grey-2);
}

.page-about .about-community__list li:last-child {
  border-bottom: 1px solid var(--line-dark-soft);
}

.page-about .about-community__list strong {
  display: block;
  margin-bottom: 2px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--lime);
}

/* ---------- 下一步入口 ---------- */
.page-about .about-next {
  background: var(--lime);
  color: var(--g-deep);
  padding: clamp(34px, 5vw, 60px) 0;
}

.page-about .about-next h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 4vw, 38px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--g-deep);
}

.page-about .about-next__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
}

.page-about .about-next__list li {
  border-top: 1px solid rgba(11, 43, 36, 0.28);
}

.page-about .about-next__list li:last-child {
  border-bottom: 1px solid rgba(11, 43, 36, 0.28);
}

.page-about .about-next__list a {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 2px 12px;
  padding: 14px 0;
  color: var(--g-deep);
  text-decoration: none;
  transition: padding-left var(--t), background var(--t);
}

.page-about .about-next__list a .data {
  grid-row: 1 / span 2;
  font-family: var(--font-data);
  font-size: 14px;
  font-weight: 600;
  color: var(--g-deep);
  opacity: 0.65;
}

.page-about .about-next__list a strong {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0;
}

.page-about .about-next__desc {
  font-size: 13.5px;
  color: var(--g-field);
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  padding-left: 8px;
  background: rgba(11, 43, 36, 0.07);
}

.page-about .about-next__list a:hover strong {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.page-about .about-next__meta {
  margin: 18px 0 0;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--g-field);
}

.page-about .about-next__meta .data {
  font-family: var(--font-data);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-map {
    grid-template-columns: repeat(6, 1fr);
    gap: 8px;
  }

  .page-about .about-map li {
    font-size: 11px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(3, 1fr);
    gap: 0 18px;
  }

  .page-about .about-next__list a {
    grid-template-columns: 44px 1fr;
    padding: 16px 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-toc {
    position: sticky;
    top: 0;
    z-index: 6;
  }

  .page-about .about-toc__wrap {
    padding-inline: var(--pad);
  }

  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .about-hero__board::before {
    inset: 0 -16px 0 0;
    clip-path: polygon(0 0, 100% 3%, 100% 100%, 0 96%);
  }

  .page-about .about-sec__grid--7-5 {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .about-sec__grid--5-7 {
    grid-template-columns: 5fr 7fr;
    align-items: start;
  }

  .page-about .about-sec__grid--7-5 .about-figure {
    margin-top: clamp(0px, 3vw, 40px);
  }

  .page-about .about-sec__grid--5-7 .about-figure--tilt {
    margin-top: clamp(0px, 2vw, 26px);
  }

  .page-about .about-rules li {
    grid-template-columns: 56px 1fr;
    column-gap: 16px;
    padding: 22px 0;
  }

  .page-about .about-rules li:nth-child(even) {
    padding-left: clamp(24px, 6vw, 96px);
  }

  .page-about .about-reach {
    grid-template-columns: 1.12fr 1fr;
    align-items: center;
  }

  .page-about .about-team__roles > div {
    grid-template-columns: 140px 1fr;
  }

  .page-about .about-community {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .page-about .about-timeline {
    padding-left: 34px;
  }

  .page-about .tl__dot {
    left: -40px;
  }

  .page-about .about-next__list a {
    grid-template-columns: 56px 1fr;
    padding: 18px 0;
  }

  .page-about .about-next__list a strong {
    font-size: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__list a,
  .page-about .about-rules li,
  .page-about .about-map li,
  .page-about .tl__dot,
  .page-about .tl__note,
  .page-about .about-next__list a,
  .page-about .stand__core {
    transition: none;
  }
}
<<<END>>>