.page-about {
  background: var(--sand);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .section {
  padding: clamp(52px, 7vw, 100px) 0;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.16;
  margin: 0;
}

.page-about h2 {
  font-size: clamp(1.6rem, 4.4vw, 2.5rem);
}

.page-about h3 {
  font-size: clamp(1.05rem, 2.4vw, 1.25rem);
}

.page-about p {
  margin: 0 0 1em;
  line-height: 1.78;
  font-size: 1rem;
}

.page-about .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--red);
  margin: 0 0 14px;
}

.page-about .eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--gold);
}

.page-about .ab-textlink {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 74, 122, 0.35);
}

.page-about .ab-textlink:hover,
.page-about .ab-textlink:focus-visible {
  border-bottom-color: var(--gold);
  color: var(--red);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--header-h) + 30px) 0 clamp(64px, 9vw, 118px);
  background: var(--red-deep);
  color: #fff;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 46px), 0 100%);
}

.page-about .ab-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
}

.page-about .ab-hero__scrim {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(120% 80% at 84% 6%, rgba(201, 161, 90, 0.42), transparent 62%),
    linear-gradient(178deg, rgba(18, 26, 43, 0.84) 0%, rgba(74, 30, 29, 0.76) 52%, rgba(107, 45, 43, 0.94) 100%);
}

.page-about .ab-hero__inner {
  position: relative;
}

.page-about .ab-hero .crumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.66);
}

.page-about .ab-hero .crumbs__list li::marker {
  content: "";
}

.page-about .ab-hero .crumbs__list li + li::before {
  content: "/";
  margin: 0 8px 0 2px;
  color: rgba(255, 255, 255, 0.4);
}

.page-about .ab-hero .crumbs__link {
  color: var(--gold-2);
  text-decoration: none;
}

.page-about .ab-hero .crumbs__link:hover,
.page-about .ab-hero .crumbs__link:focus-visible {
  text-decoration: underline;
}

.page-about .ab-hero .eyebrow {
  color: var(--gold-2);
}

.page-about .ab-hero .eyebrow::before {
  background: var(--gold-2);
}

.page-about .ab-hero h1 {
  font-size: clamp(2rem, 6.4vw, 4.1rem);
  max-width: 18ch;
  margin: 0 0 22px;
}

.page-about .ab-hero__lede {
  max-width: 58ch;
  font-size: clamp(0.98rem, 1.6vw, 1.1rem);
  color: rgba(255, 255, 255, 0.86);
  margin: 0;
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 22px;
  margin-top: 38px;
}

.page-about .ab-stat {
  border-left: 2px solid var(--gold);
  padding-left: 14px;
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 4.6vw, 2.2rem);
  color: #fff;
  line-height: 1.05;
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.7);
}

/* ---------- 起源 ---------- */
.page-about .ab-origin {
  background: var(--sand);
}

.page-about .ab-origin__grid {
  display: grid;
  gap: 34px;
}

.page-about .ab-origin__text h2 {
  max-width: 22ch;
  margin-bottom: 20px;
}

.page-about .ab-origin__text p {
  max-width: 62ch;
  color: var(--ink-2);
}

.page-about .ab-origin__points {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-origin__points li {
  position: relative;
  padding-left: 20px;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--ink-2);
}

.page-about .ab-origin__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 9px;
  height: 9px;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .ab-origin__points strong {
  color: var(--red);
  font-weight: 800;
  margin-right: 6px;
}

.page-about .ab-origin__note {
  background: var(--sand-3);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  padding: 26px 24px;
  box-shadow: var(--shadow-1);
  align-self: start;
}

.page-about .ab-origin__note-kicker {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 16px;
}

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

.page-about .ab-origin__steps li {
  counter-increment: orig;
  position: relative;
  padding-left: 40px;
  font-size: 0.92rem;
  line-height: 1.66;
  color: var(--ink-2);
}

.page-about .ab-origin__steps li::before {
  content: "0" counter(orig);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.86rem;
  color: var(--gold);
}

/* ---------- 时间线 ---------- */
.page-about .ab-line {
  background: linear-gradient(180deg, var(--sand-3), var(--sand) 40%);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-line__shell {
  display: grid;
  gap: 34px;
}

.page-about .ab-rail__title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 14px;
}

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

.page-about .ab-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 13px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--line-soft);
  color: var(--ink-2);
  text-decoration: none;
  font-size: 0.82rem;
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}

.page-about .ab-rail__list a:hover,
.page-about .ab-rail__list a:focus-visible {
  border-color: var(--gold);
  color: var(--red);
}

.page-about .ab-rail__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.76rem;
  color: var(--gold);
}

.page-about .ab-line__head h2 {
  max-width: 20ch;
  margin-bottom: 18px;
}

.page-about .ab-line__lede {
  max-width: 62ch;
  color: var(--ink-2);
}

.page-about .ab-figure {
  margin: 30px 0 34px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--red);
  box-shadow: var(--shadow-2);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-figure__cap {
  padding: 12px 18px 14px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.82);
  background: var(--red);
}

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

.page-about .ab-node {
  border-bottom: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 18px);
}

.page-about .ab-node summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 20px 0 18px;
  cursor: pointer;
  list-style: none;
  position: relative;
}

.page-about .ab-node summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-node summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 4px;
  border-radius: 4px;
}

.page-about .ab-node__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--gold);
  padding: 2px 8px;
  border: 1px solid rgba(201, 161, 90, 0.5);
  border-radius: 4px;
}

.page-about .ab-node__title {
  flex: 1 1 auto;
  min-width: 0;
  font-size: clamp(1rem, 2.6vw, 1.18rem);
  color: var(--ink);
}

.page-about .ab-node__meta {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--muted);
  letter-spacing: 0.03em;
}

.page-about .ab-node__cue {
  position: relative;
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  margin-left: auto;
  align-self: center;
}

.page-about .ab-node__cue::before,
.page-about .ab-node__cue::after {
  content: "";
  position: absolute;
  background: var(--red);
  transition: transform 0.16s var(--ease), opacity 0.16s var(--ease);
}

.page-about .ab-node__cue::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-about .ab-node__cue::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

.page-about .ab-node[open] .ab-node__cue::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .ab-node[open] {
  border-left: 3px solid var(--gold);
  padding-left: 16px;
  margin-left: -19px;
}

.page-about .ab-node__body {
  padding: 0 0 8px;
  max-width: 66ch;
}

.page-about .ab-node__body p {
  color: var(--ink-2);
  font-size: 0.96rem;
}

.page-about .ab-node__body p:last-child {
  margin-bottom: 18px;
}

/* ---------- 服务能力 ---------- */
.page-about .ab-growth {
  background: var(--sand);
}

.page-about .ab-growth__head h2 {
  max-width: 22ch;
  margin-bottom: 28px;
}

.page-about .ab-growth__bands {
  display: grid;
  gap: 16px;
}

.page-about .ab-band {
  border-radius: var(--radius);
  padding: 24px 22px 20px;
  position: relative;
  overflow: hidden;
}

.page-about .ab-band h3 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

.page-about .ab-band p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
}

.page-about .ab-band__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.7rem, 5vw, 2.4rem);
  line-height: 1;
  margin: 0 0 12px;
}

.page-about .ab-band--red {
  background: var(--red);
  color: #fff;
}

.page-about .ab-band--red .ab-band__num {
  color: var(--gold-2);
}

.page-about .ab-band--red p {
  color: rgba(255, 255, 255, 0.84);
}

.page-about .ab-band--gold {
  background: var(--sand-2);
  color: var(--ink);
  border: 1px solid rgba(201, 161, 90, 0.5);
}

.page-about .ab-band--gold .ab-band__num {
  color: var(--red);
}

.page-about .ab-band--gold p {
  color: var(--ink-2);
}

.page-about .ab-band--night {
  background: var(--night);
  color: #fff;
}

.page-about .ab-band--night .ab-band__num {
  color: var(--cyan);
}

.page-about .ab-band--night p {
  color: rgba(255, 255, 255, 0.8);
}

.page-about .ab-growth__foot {
  margin: 26px 0 0;
  font-size: 0.94rem;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  background: var(--sand-3);
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-team__grid {
  display: grid;
  gap: 30px;
}

.page-about .ab-team__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-1);
  background: var(--night);
}

.page-about .ab-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-team__text h2 {
  max-width: 16ch;
  margin-bottom: 18px;
}

.page-about .ab-team__text p {
  max-width: 62ch;
  color: var(--ink-2);
}

.page-about .ab-team__flow {
  list-style: none;
  counter-reset: flow;
  margin: 24px 0 18px;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ab-team__flow li {
  counter-increment: flow;
  position: relative;
  padding: 14px 0 14px 46px;
  border-top: 1px solid var(--line-soft);
  font-size: 0.94rem;
  line-height: 1.66;
  color: var(--ink-2);
}

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

.page-about .ab-team__flow li::before {
  content: counter(flow);
  position: absolute;
  left: 0;
  top: 14px;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--red);
  color: var(--gold-2);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
}

.page-about .ab-team__flow strong {
  color: var(--ink);
  font-weight: 800;
  margin-right: 8px;
}

.page-about .ab-team__link-line {
  font-size: 0.92rem;
  color: var(--muted);
  margin: 0;
}

/* ---------- 合作生态 ---------- */
.page-about .ab-eco {
  background: var(--sand);
}

.page-about .ab-eco__head {
  display: grid;
  gap: 14px;
  margin-bottom: 30px;
}

.page-about .ab-eco__head h2 {
  max-width: 16ch;
}

.page-about .ab-eco__lede {
  max-width: 54ch;
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0;
}

.page-about .ab-eco__cards {
  display: grid;
  gap: 16px;
}

.page-about .ab-eco__card {
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 24px 22px;
  backdrop-filter: blur(6px);
}

.page-about .ab-eco__card h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  color: var(--red);
}

.page-about .ab-eco__card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--ink-2);
}

.page-about .ab-eco__kicker {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px !important;
}

.page-about .ab-eco__card--award {
  background: var(--red);
  border-color: var(--red);
}

.page-about .ab-eco__card--award h3 {
  color: var(--gold-2);
}

.page-about .ab-eco__card--award p {
  color: rgba(255, 255, 255, 0.84);
}

.page-about .ab-eco__card--award .ab-eco__kicker {
  color: rgba(255, 255, 255, 0.6);
}

/* ---------- 下一步 ---------- */
.page-about .ab-next {
  background: var(--night);
  color: #fff;
}

.page-about .ab-next .eyebrow {
  color: var(--cyan);
}

.page-about .ab-next .eyebrow::before {
  background: var(--cyan);
}

.page-about .ab-next__head h2 {
  max-width: 14ch;
  margin-bottom: 16px;
}

.page-about .ab-next__head p {
  max-width: 56ch;
  color: rgba(255, 255, 255, 0.76);
}

.page-about .ab-next__links {
  display: grid;
  gap: 12px;
  margin-top: 32px;
}

.page-about .ab-next__link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 20px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  color: #fff;
  text-decoration: none;
  background: rgba(255, 255, 255, 0.04);
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .ab-next__link:hover,
.page-about .ab-next__link:focus-visible {
  border-color: var(--gold);
  background: rgba(201, 161, 90, 0.12);
  transform: translateY(-2px);
}

.page-about .ab-next__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--gold);
}

.page-about .ab-next__label {
  font-size: 0.95rem;
  line-height: 1.55;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-origin__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

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

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 40px;
    align-items: start;
  }

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

  .page-about .ab-eco__card--award {
    grid-column: 1 / -1;
  }

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

@media (min-width: 980px) {
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    max-width: 860px;
  }

  .page-about .ab-line__shell {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .ab-line__rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .ab-rail__list li {
    position: relative;
  }

  .page-about .ab-rail__list a {
    display: flex;
    width: 100%;
    padding: 10px 0 10px 16px;
    border: 0;
    border-radius: 0;
    background: transparent;
    border-left: 2px solid transparent;
    margin-left: -1px;
    transition: border-color 0.16s var(--ease), color 0.16s var(--ease), background 0.16s var(--ease);
  }

  .page-about .ab-rail__list a:hover,
  .page-about .ab-rail__list a:focus-visible {
    border-left-color: var(--gold);
    background: rgba(201, 161, 90, 0.1);
  }

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

  .page-about .ab-eco__card--award {
    grid-column: auto;
  }

  .page-about .ab-eco__head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: end;
    gap: 40px;
  }

  .page-about .ab-eco__lede {
    justify-self: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-next__link,
  .page-about .ab-node__cue::before,
  .page-about .ab-node__cue::after,
  .page-about .ab-rail__list a {
    transition: none;
  }

  .page-about .ab-next__link:hover,
  .page-about .ab-next__link:focus-visible {
    transform: none;
  }
}
<<<END>>>