.page-about {
  --about-measure: 33em;
  --about-pad: 56px;
  background: var(--carbon);
  color: var(--chalk);
  font-family: var(--font-body);
}

@media (min-width: 900px) {
  .page-about {
    --about-pad: 96px;
  }
}

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

.page-about .about-crumb {
  padding-top: 28px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 24px 0 var(--about-pad);
  border-bottom: 2px solid var(--line-strong);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 82% 4%, var(--lime-ghost), transparent 56%),
    radial-gradient(circle at 2% 96%, rgba(76, 107, 87, 0.3), transparent 52%);
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: 40px;
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) 312px;
    gap: 64px;
    align-items: start;
  }
}

.page-about .about-hero__title {
  margin: 14px 0 22px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(3rem, 13vw, 7rem);
  line-height: 0.86;
  letter-spacing: -0.035em;
  color: var(--chalk);
}

.page-about .about-hero__lead {
  margin: 0 0 18px;
  max-width: var(--about-measure);
  font-size: clamp(1.05rem, 2.1vw, 1.35rem);
  line-height: 1.55;
  font-weight: 500;
  color: var(--chalk);
}

.page-about .about-hero__body {
  margin: 0;
  max-width: var(--about-measure);
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 32px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line-soft);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 24px;
}

@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__facts .bb-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.6rem, 4.4vw, 2.3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-fact-label {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

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

.page-about .about-hero__frame {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border: 2px solid var(--stone);
  box-shadow: 6px 6px 0 rgba(11, 15, 13, 0.6);
}

.page-about .about-hero__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-hero__figure figcaption {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  background: var(--ink);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-index__inner {
  display: flex;
  flex-wrap: wrap;
}

.page-about .about-index__item {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 15px 18px 13px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
  text-decoration: none;
  border-right: 1px solid var(--line-soft);
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-index__item:hover,
.page-about .about-index__item:focus-visible {
  color: var(--carbon);
  background: var(--lime);
  outline: none;
}

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

.page-about .about-index__item:hover .about-index__num,
.page-about .about-index__item:focus-visible .about-index__num {
  color: var(--carbon);
}

/* ---------- 通用区块骨架 ---------- */
.page-about .about-block {
  padding: var(--about-pad) 0;
}

.page-about .about-block--light {
  background: var(--chalk);
  color: var(--carbon);
}

.page-about .about-head {
  display: grid;
  gap: 10px;
  padding-bottom: 20px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-head__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--lime);
}

.page-about .about-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 4.6vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-about .about-head__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .about-block--light .about-head {
  border-bottom-color: rgba(11, 15, 13, 0.16);
}

.page-about .about-block--light .about-head__num {
  color: var(--clay);
}

.page-about .about-block--light .about-head h2 {
  color: var(--carbon);
}

.page-about .about-block--light .about-head__note {
  color: #55605A;
}

/* ---------- 01 数据流程 ---------- */
.page-about .about-flow__lede {
  margin: 0 0 32px;
  max-width: var(--about-measure);
  font-size: 15px;
  line-height: 1.75;
  color: #39413B;
}

.page-about .about-flow__figure {
  margin: 0 0 36px;
}

.page-about .about-flow__frame {
  aspect-ratio: 8 / 3;
  overflow: hidden;
  border: 2px solid var(--stone);
  box-shadow: 5px 5px 0 var(--stone);
}

.page-about .about-flow__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-flow__figure figcaption {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: #55605A;
}

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

.page-about .about-step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  padding: 26px 0;
  border-top: 1px solid rgba(11, 15, 13, 0.14);
}

@media (min-width: 760px) {
  .page-about .about-step {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 32px;
  }
}

.page-about .about-step__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--clay);
}

.page-about .about-step h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--carbon);
}

.page-about .about-step p {
  margin: 0;
  max-width: var(--about-measure);
  font-size: 15px;
  line-height: 1.75;
  color: #39413B;
}

/* ---------- 02 团队 ---------- */
.page-about .about-team__rows {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-team__row {
  display: grid;
  gap: 8px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line-soft);
  transition: background-color 0.2s var(--ease);
}

@media (min-width: 760px) {
  .page-about .about-team__row {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }
}

.page-about .about-team__row:hover {
  background: rgba(200, 241, 78, 0.045);
}

.page-about .about-team__name {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 15px;
  font-weight: 700;
  color: var(--lime);
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  color: var(--mist);
}

.page-about .about-team__row p {
  margin: 0;
  max-width: var(--about-measure);
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-authors {
  margin-top: 44px;
  padding: 28px 22px;
  border: 2px solid var(--stone);
  background: var(--ink);
}

@media (min-width: 760px) {
  .page-about .about-authors {
    padding: 32px 32px 36px;
  }
}

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

@media (min-width: 760px) {
  .page-about .about-authors__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 30px;
  }
}

.page-about .about-authors__list p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 03 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  background: var(--ink);
}

.page-about .about-timeline__bg {
  position: absolute;
  top: 4%;
  right: -16%;
  width: min(520px, 68%);
  opacity: 0.15;
  pointer-events: none;
}

.page-about .about-timeline__bg img {
  width: 100%;
  height: auto;
  filter: grayscale(1);
}

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

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 2px solid var(--moss);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 34px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -33px;
  top: 7px;
  width: 12px;
  height: 12px;
  background: var(--carbon);
  border: 2px solid var(--lime);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-timeline__stage {
  margin: 10px 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--chalk);
}

.page-about .about-timeline__item > p:not(.about-timeline__stage):not(.about-timeline__more) {
  margin: 0;
  max-width: var(--about-measure);
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-timeline__more {
  max-height: 0;
  margin-top: 0;
  padding-left: 12px;
  overflow: hidden;
  opacity: 0;
  border-left: 2px solid var(--amber);
  font-size: 13px;
  line-height: 1.7;
  color: var(--amber);
  transition: max-height 0.32s var(--ease), opacity 0.26s var(--ease), margin-top 0.32s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__more,
.page-about .about-timeline__item:focus-within .about-timeline__more {
  max-height: 140px;
  margin-top: 14px;
  opacity: 1;
}

@media (hover: none) {
  .page-about .about-timeline__more {
    max-height: none;
    margin-top: 14px;
    opacity: 1;
  }
}

/* ---------- 04 平台挑选 ---------- */
.page-about .about-review__grid {
  display: grid;
  gap: 34px;
}

@media (min-width: 900px) {
  .page-about .about-review__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
  }
}

.page-about .about-review__text p {
  margin: 0 0 16px;
  max-width: var(--about-measure);
  font-size: 15px;
  line-height: 1.75;
  color: #39413B;
}

.page-about .about-review__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-dim {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(11, 15, 13, 0.16);
}

@media (min-width: 560px) {
  .page-about .about-dim {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 28px;
  }
}

.page-about .about-dim li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid rgba(11, 15, 13, 0.12);
  font-size: 14px;
  color: var(--carbon);
}

.page-about .about-dim__idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--clay);
}

/* ---------- 05 合作 ---------- */
.page-about .about-partner__grid {
  display: grid;
  gap: 0;
}

@media (min-width: 860px) {
  .page-about .about-partner__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-partner__item {
  padding: 24px 0;
  border-top: 1px solid var(--line-soft);
}

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

@media (min-width: 860px) {
  .page-about .about-partner__item {
    padding: 4px 28px 4px;
    border-top: 0;
    border-bottom: 0;
    border-left: 1px solid var(--line-soft);
  }

  .page-about .about-partner__item:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .about-partner__item:last-child {
    border-bottom: 0;
    padding-right: 0;
  }
}

.page-about .about-partner__stat {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-partner__item h3 {
  margin: 14px 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--chalk);
}

.page-about .about-partner__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: var(--about-pad) 0;
  background: var(--ink);
  border-top: 2px solid var(--line-strong);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 28px;
}

@media (min-width: 860px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 48px;
  }
}

.page-about .about-cta h2 {
  margin: 12px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 4.4vw, 2.4rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 30em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
<<<END>>>