.page-about {
  --ab-pad: clamp(20px, 4vw, 64px);
  --ab-line: 1px solid var(--line-700);
  --ab-gap: clamp(28px, 5vw, 72px);
  background: var(--ink-950);
  color: var(--paper-100);
  font-family: var(--font-body);
  overflow-x: hidden;
  padding-bottom: clamp(48px, 7vw, 104px);
}

.page-about .ab-wrap {
  width: 100%;
  max-width: calc(var(--max-w) - 120px);
  margin-inline: auto;
  padding-inline: var(--ab-pad);
}

.page-about .breadcrumb {
  padding-block: 20px 4px;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel-400);
}

.page-about .breadcrumb__link {
  color: var(--steel-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--paper-100);
  border-bottom-color: var(--amber-500);
}

.page-about .breadcrumb__item [aria-current="page"] {
  color: var(--paper-100);
}

.page-about .breadcrumb__sep {
  color: var(--line-700);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  padding-bottom: clamp(32px, 5vw, 56px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 100%;
  background-image:
    linear-gradient(to right, rgba(23, 50, 79, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(23, 50, 79, 0.35) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), transparent 78%);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  border: 1px solid var(--line-700);
  border-top: 3px solid var(--amber-500);
  padding-block: clamp(28px, 5vw, 64px);
  padding-inline: clamp(20px, 4vw, 56px);
  margin-top: 16px;
  background: linear-gradient(160deg, var(--ink-900), var(--ink-950) 72%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .ab-hero__inner::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 22px;
  height: 22px;
  border-left: 1px solid var(--line-700);
  background: var(--ink-800);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.page-about .ab-hero__kicker {
  margin: 0 0 18px;
  color: var(--amber-500);
}

.page-about .ab-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.2vw, 82px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--paper-100);
}

.page-about .ab-hero__lede {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 680px;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--steel-400);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.5vw, 36px);
}

.page-about .ab-hero__data {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: clamp(20px, 3vw, 32px) auto 0;
  padding: 0 var(--ab-pad);
  list-style: none;
  border-top: var(--ab-line);
}

.page-about .ab-hero__cell {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 2px;
  border-bottom: var(--ab-line);
}

.page-about .ab-hero__num {
  flex: 0 0 auto;
  min-width: 96px;
  font-size: 26px;
  font-weight: 500;
  color: var(--blue-500);
  letter-spacing: 0.02em;
}

.page-about .ab-hero__cap {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--steel-400);
}

/* ---------- 章节通用 ---------- */

.page-about .ab-chapter {
  padding-block: clamp(44px, 7vw, 108px);
}

.page-about .ab-chapter--dark {
  background: var(--ink-900);
  border-top: var(--ab-line);
  border-bottom: var(--ab-line);
}

.page-about .ab-chapter__head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 12px;
  column-gap: 16px;
  border-top: var(--ab-line);
  padding-top: 16px;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .ab-chapter__idx {
  font-size: 13px;
  color: var(--amber-500);
  letter-spacing: 0.1em;
  padding: 2px 8px;
  border: 1px solid var(--amber-700);
}

.page-about .ab-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--paper-100);
}

.page-about .ab-chapter__rule {
  display: none;
  height: 1px;
  background: var(--line-700);
}

.page-about .ab-intro {
  margin: 0 0 clamp(24px, 4vw, 40px);
  max-width: 720px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--steel-400);
}

.page-about .ab-body {
  margin: 0;
  max-width: 720px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--steel-400);
}

.page-about .ab-inline-link {
  color: var(--blue-500);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--blue-700);
  transition: border-color var(--ease), color var(--ease);
}

.page-about .ab-inline-link:hover,
.page-about .ab-inline-link:focus-visible {
  color: var(--paper-100);
  border-bottom-color: var(--amber-500);
}

.page-about .ab-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .ab-split--tight {
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .ab-split__text p {
  margin: 0 0 18px;
  max-width: 660px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--steel-400);
}

.page-about .ab-quote {
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 16px 0 16px 20px;
  border-left: 3px solid var(--amber-500);
  background: var(--ink-800);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.6;
  letter-spacing: -0.01em;
  color: var(--paper-100);
}

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

.page-about .ab-figure .img-frame {
  background: var(--ink-800);
  border: 1px solid var(--line-700);
}

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

.page-about .ab-figure .img-frame__caption {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--steel-400);
}

/* ---------- 通道四段 ---------- */

.page-about .ab-gates {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--ab-line);
}

.page-about .ab-gate {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 16px;
  padding: 22px 0 22px 14px;
  border-bottom: var(--ab-line);
  transition: background var(--ease);
}

.page-about .ab-gate::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 2px;
  height: 0;
  background: var(--amber-500);
  transition: height var(--ease);
}

.page-about .ab-gate:hover::before,
.page-about .ab-gate:focus-within::before {
  height: calc(100% - 44px);
}

.page-about .ab-gate__idx {
  grid-row: 1 / span 2;
  font-size: 13px;
  color: var(--blue-500);
  letter-spacing: 0.1em;
  padding-top: 4px;
}

.page-about .ab-gate__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2.2vw, 23px);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--paper-100);
}

.page-about .ab-gate__text {
  grid-column: 2;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel-400);
}

.page-about .ab-gate__link {
  grid-column: 2;
  justify-self: start;
  margin-top: 6px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--amber-500);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--ease);
}

.page-about .ab-gate__link:hover,
.page-about .ab-gate__link:focus-visible {
  border-bottom-color: var(--amber-500);
}

/* ---------- 时间线 ---------- */

.page-about .ab-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 0 26px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line-700);
}

.page-about .ab-timeline__item {
  position: relative;
  padding-bottom: clamp(20px, 3vw, 30px);
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 9px;
  width: 11px;
  height: 11px;
  background: var(--ink-950);
  border: 1px solid var(--blue-500);
  box-sizing: border-box;
}

.page-about .ab-timeline__item--now::before {
  background: var(--amber-500);
  border-color: var(--amber-500);
  box-shadow: 0 0 0 4px rgba(255, 158, 44, 0.16);
}

.page-about .ab-timeline__year {
  display: block;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--blue-500);
  margin-bottom: 4px;
}

.page-about .ab-timeline__item--now .ab-timeline__year {
  color: var(--amber-500);
}

.page-about .ab-timeline__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--paper-100);
}

.page-about .ab-timeline__text {
  margin: 0;
  max-width: 460px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel-400);
}

/* ---------- 团队数据 ---------- */

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--line-700);
  border: 1px solid var(--line-700);
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px 20px;
  background: var(--ink-800);
}

.page-about .ab-stat__num {
  font-size: clamp(30px, 5.4vw, 52px);
  line-height: 1;
  font-weight: 500;
  color: var(--paper-100);
  letter-spacing: -0.02em;
}

.page-about .ab-stat__label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--amber-500);
}

.page-about .ab-stat__desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel-400);
}

.page-about .ab-stats--three .ab-stat {
  background: var(--ink-900);
}

/* ---------- 案例归档 ---------- */

.page-about .ab-archive {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .ab-archive__main p {
  margin: 0 0 16px;
  max-width: 700px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--steel-400);
}

.page-about .ab-archive__side {
  border-top: 2px solid var(--blue-500);
  background: var(--ink-800);
  padding: 18px 18px 8px;
}

.page-about .ab-archive__side .label {
  display: block;
  margin: 0 0 12px;
  color: var(--steel-400);
}

.page-about .ab-facts {
  margin: 0;
}

.page-about .ab-facts__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-700);
}

.page-about .ab-facts__row:last-child {
  border-bottom: 0;
}

.page-about .ab-facts dt {
  font-size: 13px;
  color: var(--steel-400);
}

.page-about .ab-facts dd {
  margin: 0;
  font-size: 14px;
  color: var(--paper-100);
  text-align: right;
}

/* ---------- 合作生态 ---------- */

.page-about .ab-eco {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 12px;
  list-style: none;
  margin: 0 0 clamp(24px, 4vw, 40px);
  padding: 0;
}

.page-about .ab-eco__node {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--line-700);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--paper-100);
  background: var(--ink-950);
  transition: border-color var(--ease), transform var(--ease);
}

.page-about .ab-eco__dot {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  background: var(--blue-500);
  transition: background var(--ease);
}

.page-about .ab-eco__node:hover,
.page-about .ab-eco__node:focus-within {
  border-color: var(--amber-500);
}

.page-about .ab-eco__node:hover .ab-eco__dot,
.page-about .ab-eco__node:focus-within .ab-eco__dot {
  background: var(--amber-500);
}

/* ---------- 收尾 ---------- */

.page-about .ab-chapter--closing {
  padding-bottom: clamp(20px, 3vw, 40px);
}

.page-about .ab-next {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--ab-line);
}

.page-about .ab-next__item {
  border-bottom: var(--ab-line);
}

.page-about .ab-next__link {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 16px;
  padding: 20px 12px 20px 0;
  text-decoration: none;
  transition: background var(--ease), padding-left var(--ease);
}

.page-about .ab-next__link:hover,
.page-about .ab-next__link:focus-visible {
  background: var(--ink-900);
  padding-left: 12px;
}

.page-about .ab-next__idx {
  grid-row: 1 / span 2;
  align-self: start;
  font-size: 13px;
  color: var(--blue-500);
  padding-top: 3px;
  letter-spacing: 0.1em;
}

.page-about .ab-next__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2.1vw, 21px);
  color: var(--paper-100);
  letter-spacing: -0.01em;
}

.page-about .ab-next__desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--steel-400);
}

.page-about .ab-next__link:hover .ab-next__name,
.page-about .ab-next__link:focus-visible .ab-next__name {
  color: var(--amber-500);
}

/* ---------- 动效 ---------- */

.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 240ms ease, transform 240ms ease;
}

.page-about [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .ab-hero__data {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }

  .page-about .ab-hero__cell {
    border-bottom: 0;
    border-top: 1px solid var(--line-700);
    border-bottom: var(--ab-line);
  }

  .page-about .ab-eco {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .ab-stats--three {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-chapter__head {
    grid-template-columns: auto auto 1fr;
    align-items: center;
  }

  .page-about .ab-chapter__rule {
    display: block;
    margin-left: 8px;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .ab-split--reverse {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  }

  .page-about .ab-split--reverse .ab-figure {
    order: 0;
  }

  .page-about .ab-split--reverse .ab-timeline {
    order: 1;
  }

  .page-about .ab-split--tight {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .ab-archive {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.85fr);
    gap: clamp(32px, 5vw, 80px);
  }

  .page-about .ab-archive__side {
    position: sticky;
    top: 32px;
  }

  .page-about .ab-gate {
    grid-template-columns: 64px minmax(0, 1fr) 168px;
    align-items: start;
    padding-block: 26px;
    column-gap: 24px;
  }

  .page-about .ab-gate__idx {
    grid-row: auto;
    padding-top: 6px;
  }

  .page-about .ab-gate__text {
    grid-column: 2;
  }

  .page-about .ab-gate__link {
    grid-column: 3;
    grid-row: 1;
    justify-self: end;
    margin-top: 6px;
  }

  .page-about .ab-gate__name {
    grid-column: 2;
  }

  .page-about .ab-hero__data {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 24px;
  }

  .page-about .ab-hero__cell {
    display: block;
  }

  .page-about .ab-hero__num {
    display: block;
    min-width: 0;
    font-size: 30px;
    margin-bottom: 6px;
  }

  .page-about .ab-hero__cap {
    display: block;
    font-size: 12px;
    line-height: 1.6;
  }

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

@media (min-width: 1200px) {
  .page-about .ab-hero__title {
    max-width: 16ch;
  }

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

  .page-about .ab-timeline::before {
    left: 6px;
  }

  .page-about .ab-timeline__item::before {
    left: -34px;
    width: 13px;
    height: 13px;
  }
}
<<<END>>>