.page-about {
  --about-index-w: 172px;
  --about-body-max: 38em;
}

.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(20px, 3vw, 36px) clamp(36px, 6vw, 72px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 32px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(30px, 6vw, 54px);
  line-height: 1.14;
  color: var(--white);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: var(--about-body-max);
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 0;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__meta li {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
  padding-right: 16px;
  margin-right: 16px;
  border-right: 1px solid var(--line);
}

.page-about .about-hero__meta li:last-child {
  border-right: 0;
  padding-right: 0;
  margin-right: 0;
}

.page-about .hero-figure {
  margin: 0;
  position: relative;
}

.page-about .hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), 0 100%);
  filter: saturate(0.88) contrast(1.04);
}

.page-about .hero-figure__cap {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 64px);
    align-items: end;
  }
  .page-about .hero-figure {
    align-self: stretch;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
  }
}

/* ---------- 长卷骨架 ---------- */
.page-about .longform {
  display: grid;
  gap: 24px;
  padding-bottom: clamp(48px, 8vw, 104px);
}

@media (min-width: 1000px) {
  .page-about .longform {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    column-gap: clamp(32px, 5vw, 72px);
  }
}

/* ---------- 章节索引 ---------- */
.page-about .chapter-index {
  align-self: start;
}

.page-about .chapter-index__label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

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

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

.page-about .chapter-index__list > li {
  flex: 0 0 auto;
}

.page-about .chapter-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  white-space: nowrap;
  font-size: 13px;
  line-height: 1.3;
  color: var(--mist);
  text-decoration: none;
  background: var(--ink-800);
  border-bottom: 2px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .chapter-index__num {
  font-family: var(--font-score);
  font-size: 15px;
  line-height: 1;
  color: var(--lime-deep);
}

.page-about .chapter-index__link:hover,
.page-about .chapter-index__link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--lime);
  background: var(--ink-900);
}

@media (min-width: 1000px) {
  .page-about .chapter-index {
    position: sticky;
    top: 96px;
    padding-top: 6px;
  }
  .page-about .chapter-index__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .chapter-index__list > li {
    flex: 1 1 auto;
  }
  .page-about .chapter-index__link {
    width: 100%;
    box-sizing: border-box;
    padding: 9px 10px 9px 12px;
    background: transparent;
    border-bottom: 0;
    border-left: 2px solid var(--line);
    white-space: normal;
  }
  .page-about .chapter-index__link:hover,
  .page-about .chapter-index__link:focus-visible {
    background: var(--ink-900);
    border-left-color: var(--lime);
  }
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  padding-block: clamp(28px, 4vw, 48px);
  scroll-margin-top: 104px;
}

.page-about .chapter::before {
  content: "";
  display: block;
  width: 56px;
  height: 6px;
  margin-bottom: 22px;
  background: var(--line);
}

.page-about .chapter:nth-of-type(odd)::before {
  background: var(--lime);
}

.page-about .chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  margin-bottom: 18px;
}

.page-about .chapter__index {
  font-family: var(--font-score);
  font-size: clamp(26px, 4vw, 38px);
  line-height: 0.9;
  color: var(--lime);
  letter-spacing: 0.02em;
}

.page-about .chapter__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.28;
  color: var(--white);
}

.page-about .chapter__body {
  max-width: var(--about-body-max);
}

.page-about .chapter__body p {
  margin: 0 0 16px;
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--mist);
}

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

.page-about .chapter__body--after {
  margin-top: 26px;
}

.page-about .chapter__tail {
  margin: 24px 0 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 要点 ---------- */
.page-about .points {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .points li {
  position: relative;
  padding-left: 22px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  background: var(--lime);
}

/* ---------- 通栏图片 ---------- */
.page-about .wide-figure {
  margin: 26px 0 0;
}

.page-about .wide-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(0.85);
}

.page-about .wide-figure figcaption,
.page-about .side-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* ---------- 数据链路 ---------- */
.page-about .flow {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 3px;
}

.page-about .flow__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 16px 16px 14px;
  background: var(--ink-800);
  border-left: 3px solid var(--line);
  transition: border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .flow__item:hover {
  border-left-color: var(--lime);
  background: var(--ink-900);
}

.page-about .flow__num {
  font-family: var(--font-score);
  font-size: 20px;
  line-height: 1.1;
  color: var(--lime-deep);
}

.page-about .flow__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .flow__body p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 关键数字 ---------- */
.page-about .stat-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 26px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .stat {
  padding: 18px 16px 20px;
  background: var(--ink-900);
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-score);
  font-size: clamp(38px, 9vw, 66px);
  line-height: 0.92;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .stat__cap {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--mist);
}

@media (min-width: 720px) {
  .page-about .stat-row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .stat {
    padding: 22px 18px 24px;
  }
}

/* ---------- 团队 ---------- */
.page-about .chapter__split {
  display: grid;
  gap: 26px;
}

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

.page-about .side-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(0.85);
}

@media (min-width: 760px) {
  .page-about .chapter__split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(24px, 4vw, 40px);
    align-items: start;
  }
}

.page-about .crew {
  display: grid;
  gap: 1px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .crew__item {
  padding: 14px 16px;
  background: var(--ink-800);
}

.page-about .crew__tag {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 8px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-950);
  background: var(--lime);
}

.page-about .crew__item p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

@media (min-width: 620px) {
  .page-about .crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .aside-note {
  margin-top: 26px;
}

.page-about .aside-note p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 阶段时间线 ---------- */
.page-about .stage {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .stage .step {
  border-top: 1px solid var(--line);
}

.page-about .stage .step:first-child {
  border-top: 2px solid var(--line);
}

.page-about .stage .step__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
  transition: color 160ms var(--ease);
}

.page-about .stage .step__head:hover .step__title,
.page-about .stage .step__head:focus-visible .step__title {
  color: var(--lime);
}

.page-about .stage .step__num {
  font-family: var(--font-score);
  font-size: 26px;
  line-height: 1;
  color: var(--lime-deep);
  min-width: 2ch;
}

.page-about .stage .step__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--white);
  transition: color 160ms var(--ease);
}

.page-about .stage .step__body {
  padding: 0 0 18px 0;
}

.page-about .stage .step__body p {
  margin: 0;
  max-width: var(--about-body-max);
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .stage .step[data-open="false"] .step__body {
  display: none;
}

.page-about .stage .step[data-open="true"] .step__body {
  display: block;
}

/* ---------- 合作 ---------- */
.page-about .partner-list {
  display: grid;
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .partner-list__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 16px;
  background: var(--ink-900);
}

.page-about .partner-list__num {
  font-family: var(--font-score);
  font-size: clamp(28px, 6vw, 40px);
  line-height: 1;
  color: var(--lime);
}

.page-about .partner-list__item p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

@media (min-width: 760px) {
  .page-about .partner-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .partner-list__item {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }
}

/* ---------- 收尾通道 ---------- */
.page-about .closing {
  padding-block: clamp(40px, 7vw, 88px);
  background: var(--ink-900);
  border-top: 1px solid var(--line);
}

.page-about .closing__title {
  margin: 0 0 22px;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(20px, 3vw, 28px);
  color: var(--white);
}

.page-about .closing__grid {
  display: grid;
  gap: 4px;
}

.page-about .passage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 6px 16px;
  padding: 18px 20px;
  text-decoration: none;
  background: var(--ink-800);
  border-left: 3px solid var(--line);
  transition: border-color 160ms var(--ease), background 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .passage:hover,
.page-about .passage:focus-visible {
  border-left-color: var(--lime);
  background: var(--ink-950);
  transform: translateX(4px);
}

.page-about .passage__kicker {
  grid-column: 1;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--lime);
}

.page-about .passage__text {
  grid-column: 1;
  font-family: var(--font-head);
  font-size: 15px;
  line-height: 1.6;
  color: var(--white);
}

.page-about .passage__arrow {
  grid-column: 2;
  grid-row: 1 / span 2;
  font-family: var(--font-score);
  font-size: 22px;
  color: var(--mist);
  transition: color 160ms var(--ease);
}

.page-about .passage:hover .passage__arrow,
.page-about .passage:focus-visible .passage__arrow {
  color: var(--lime);
}

.page-about .closing__note {
  margin: 22px 0 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

@media (min-width: 860px) {
  .page-about .closing__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .passage {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
    padding: 22px 20px 24px;
    min-height: 150px;
    border-left: 0;
    border-top: 3px solid var(--line);
  }
  .page-about .passage:hover,
  .page-about .passage:focus-visible {
    border-left-color: transparent;
    border-top-color: var(--lime);
    transform: translateY(-4px);
  }
  .page-about .passage__arrow {
    grid-column: 1;
    grid-row: auto;
    justify-self: end;
    margin-top: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .passage,
  .page-about .flow__item,
  .page-about .chapter-index__link,
  .page-about .stage .step__title {
    transition: none;
  }
  .page-about .passage:hover,
  .page-about .passage:focus-visible {
    transform: none;
  }
}
<<<END>>>