.page-about {
  --ab-line: rgba(138, 154, 168, .22);
  --ab-line-soft: rgba(138, 154, 168, .12);
  --ab-gap: clamp(1.25rem, 4vw, 2.5rem);
  background: var(--bf-deep-900);
  color: var(--bf-cream-100);
  font-family: var(--bf-font-body);
  overflow-x: clip;
}

.page-about a {
  color: inherit;
}

/* ---------- hero ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(1.5rem, 4vw, 2.5rem) 0 clamp(2.25rem, 5vw, 3.5rem);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: -12% -25% auto -25%;
  height: 82%;
  z-index: -1;
  background:
    linear-gradient(118deg, rgba(43, 227, 198, .18) 0%, rgba(43, 227, 198, 0) 48%),
    linear-gradient(298deg, rgba(255, 107, 74, .12) 0%, rgba(255, 107, 74, 0) 42%);
  clip-path: polygon(0 0, 100% 0, 100% 58%, 0 100%);
  pointer-events: none;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-hero__intro {
  margin: 1rem 0 0;
  font-size: clamp(1rem, 2.2vw, 1.1rem);
  line-height: 1.8;
  color: var(--bf-cream-100);
  max-width: 34em;
}

.page-about .ab-hero .bf-crumbs {
  margin-bottom: 1.25rem;
}

.page-about .ab-hero .bf-crumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--bf-rock-400);
}

.page-about .ab-hero .bf-crumbs__list li + li::before {
  content: "/";
  margin-right: .5rem;
  color: rgba(138, 154, 168, .55);
}

.page-about .ab-hero .bf-crumbs__list a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--bf-ease), color var(--bf-ease);
}

.page-about .ab-hero .bf-crumbs__list a:hover {
  color: var(--bf-cyan-500);
  border-color: var(--bf-cyan-500);
}

.page-about .bf-eyebrow {
  margin: 0 0 .75rem;
  font-family: var(--bf-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--bf-cyan-500);
}

.page-about h1 {
  margin: 0;
  font-family: var(--bf-font-display);
  font-size: clamp(1.85rem, 6vw, 3.1rem);
  line-height: 1.14;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--bf-ice-50);
}

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

.page-about .ab-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--bf-radius);
  border: 1px solid var(--bf-line-cyan);
  object-fit: cover;
}

.page-about .ab-hero__caption {
  margin-top: .8rem;
  font-size: 13px;
  line-height: 1.65;
  color: var(--bf-rock-400);
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
  border-radius: 14px;
  overflow: hidden;
}

.page-about .ab-stats__item {
  background: var(--bf-deep-700);
  padding: 1rem 1.05rem;
}

.page-about .ab-stats__num {
  display: block;
  font-family: var(--bf-font-mono);
  font-size: clamp(1.35rem, 3.4vw, 1.8rem);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--bf-cyan-500);
}

.page-about .ab-stats__label {
  display: block;
  margin-top: .35rem;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--bf-rock-400);
}

/* ---------- 索引条 ---------- */
.page-about .ab-index {
  border-top: 1px solid var(--ab-line);
  border-bottom: 1px solid var(--ab-line);
  background: rgba(14, 47, 74, .55);
}

.page-about .ab-index__list {
  display: flex;
  gap: .4rem;
  margin: 0 auto;
  padding: .8rem var(--bf-gutter);
  max-width: var(--bf-max);
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-index__list a {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .45rem .8rem;
  border: 1px solid var(--ab-line);
  border-radius: 999px;
  white-space: nowrap;
  font-size: 13.5px;
  text-decoration: none;
  color: var(--bf-cream-100);
  transition: border-color var(--bf-ease), color var(--bf-ease), background-color var(--bf-ease);
}

.page-about .ab-index__list a .bf-mono {
  font-size: 11px;
  color: var(--bf-rock-400);
  transition: color var(--bf-ease);
}

.page-about .ab-index__list a:hover,
.page-about .ab-index__list a:focus-visible {
  border-color: var(--bf-cyan-500);
  color: var(--bf-cyan-500);
}

.page-about .ab-index__list a[aria-current="true"] {
  background: rgba(43, 227, 198, .12);
  border-color: var(--bf-cyan-500);
  color: var(--bf-cyan-500);
}

.page-about .ab-index__list a[aria-current="true"] .bf-mono {
  color: var(--bf-cyan-500);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-sec {
  padding-block: clamp(2.25rem, 5vw, 3.75rem);
  border-top: 1px solid var(--ab-line-soft);
}

.page-about .ab-sec__head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.page-about .ab-sec__num {
  margin: 0;
  font-size: clamp(2.4rem, 7vw, 3.6rem);
  line-height: .85;
  letter-spacing: -.05em;
  color: rgba(43, 227, 198, .16);
  -webkit-text-stroke: 1px rgba(43, 227, 198, .45);
}

.page-about .ab-sec__title {
  margin: 0;
  font-family: var(--bf-font-display);
  font-size: clamp(1.35rem, 3.6vw, 1.85rem);
  line-height: 1.28;
  letter-spacing: -.01em;
  font-weight: 800;
  color: var(--bf-ice-50);
}

.page-about .ab-lead {
  margin: 0 0 1.1rem;
  font-size: clamp(1rem, 2.3vw, 1.12rem);
  line-height: 1.78;
  color: var(--bf-cream-100);
}

.page-about .ab-text {
  margin: 0 0 1rem;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(244, 235, 221, .88);
}

.page-about .ab-sub {
  margin: 0 0 .6rem;
  font-size: 1.05rem;
  line-height: 1.4;
  font-weight: 700;
  color: var(--bf-cyan-500);
  letter-spacing: .01em;
}

.page-about .ab-quote {
  margin: 1.5rem 0 0;
  padding: 1rem 0 1rem 1.15rem;
  border-left: 2px solid var(--bf-cyan-500);
  font-size: clamp(1rem, 2.4vw, 1.12rem);
  line-height: 1.7;
  color: var(--bf-ice-50);
}

.page-about .ab-link {
  color: var(--bf-cyan-500);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 227, 198, .45);
  transition: border-color var(--bf-ease), background-color var(--bf-ease);
}

.page-about .ab-link:hover {
  border-color: var(--bf-cyan-500);
  background: rgba(43, 227, 198, .12);
}

/* ---------- 团队树 ---------- */
.page-about .ab-tree-wrap {
  margin-top: 1.6rem;
}

.page-about .ab-tree {
  display: grid;
  gap: .9rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-tree__node {
  position: relative;
  padding: 1.1rem 1.1rem 1.25rem;
  border: 1px solid var(--ab-line);
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(14, 47, 74, .9), rgba(7, 26, 43, .55));
  transition: border-color var(--bf-ease), transform var(--bf-ease);
}

.page-about .ab-tree__node:hover {
  border-color: var(--bf-line-cyan);
  transform: translateY(-2px);
}

.page-about .ab-tree__count {
  margin: 0 0 .45rem;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--bf-coral-500);
}

.page-about .ab-tree__title {
  margin: 0 0 .5rem;
  font-size: 1.02rem;
  line-height: 1.35;
  font-weight: 700;
  color: var(--bf-ice-50);
}

.page-about .ab-tree__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(244, 235, 221, .82);
}

/* ---------- 图文行 ---------- */
.page-about .ab-media-row {
  display: grid;
  gap: 1.25rem;
  margin-top: 1.75rem;
}

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

.page-about .ab-media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 14px;
  border: 1px solid var(--ab-line);
  object-fit: cover;
}

.page-about .ab-media__caption {
  margin-top: .7rem;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--bf-rock-400);
}

.page-about .ab-media--wide {
  margin-top: 1.6rem;
}

.page-about .ab-media-row__text .ab-text:last-child {
  margin-bottom: 0;
}

/* ---------- 三审流程 ---------- */
.page-about .ab-flow {
  display: grid;
  gap: .75rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-step {
  border: 1px solid var(--ab-line);
  border-radius: 14px;
  background: rgba(14, 47, 74, .45);
  transition: border-color var(--bf-ease);
}

.page-about .ab-step:hover,
.page-about .ab-step[open] {
  border-color: var(--bf-line-cyan);
}

.page-about .ab-step__summary {
  display: flex;
  align-items: center;
  gap: .85rem;
  padding: 1rem 1.1rem;
  cursor: pointer;
  list-style: none;
  color: var(--bf-ice-50);
  font-size: 1rem;
  font-weight: 600;
}

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

.page-about .ab-step__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--bf-font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--bf-cyan-500);
  transition: transform var(--bf-ease);
}

.page-about .ab-step[open] .ab-step__summary::after {
  transform: rotate(45deg);
}

.page-about .ab-step__summary:focus-visible {
  outline: 2px solid var(--bf-cyan-500);
  outline-offset: 2px;
  border-radius: 12px;
}

.page-about .ab-step__num {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--bf-cyan-500);
}

.page-about .ab-step__panel {
  padding: 0 1.1rem 1.15rem;
}

.page-about .ab-step__panel p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(244, 235, 221, .84);
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  position: relative;
  display: grid;
  gap: 1.35rem;
  margin: 1.6rem 0 0;
  padding: 0 0 0 1.9rem;
  list-style: none;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: .55rem;
  bottom: .55rem;
  width: 1px;
  background: linear-gradient(180deg, var(--bf-clay-500), rgba(185, 107, 75, .1));
}

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

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: -1.9rem;
  top: .5rem;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--bf-deep-900);
  border: 1px solid var(--bf-clay-500);
}

.page-about .ab-tl--current::before {
  background: var(--bf-coral-500);
  border-color: var(--bf-coral-500);
  box-shadow: 0 0 0 4px rgba(255, 107, 74, .16);
}

.page-about .ab-tl__mark {
  margin: 0 0 .35rem;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--bf-rock-400);
}

.page-about .ab-tl--current .ab-tl__mark {
  color: var(--bf-coral-500);
}

.page-about .ab-tl__card {
  padding: .9rem 1rem 1rem;
  border: 1px solid var(--ab-line);
  border-radius: 12px;
  background: rgba(14, 47, 74, .38);
  transition: border-color var(--bf-ease), background-color var(--bf-ease);
}

.page-about .ab-tl:hover .ab-tl__card,
.page-about .ab-tl__card:focus-within {
  border-color: var(--bf-line-cyan);
  background: rgba(14, 47, 74, .62);
}

.page-about .ab-tl__title {
  margin: 0 0 .4rem;
  font-size: 1rem;
  line-height: 1.4;
  font-weight: 700;
  color: var(--bf-ice-50);
}

.page-about .ab-tl__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 235, 221, .82);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partner-grid {
  display: grid;
  gap: .85rem;
  margin-top: 1.4rem;
}

.page-about .ab-partner-card {
  padding: 1.1rem 1.15rem 1.2rem;
  border: 1px solid var(--ab-line);
  border-radius: 14px;
  background: linear-gradient(160deg, rgba(95, 140, 106, .16), rgba(7, 26, 43, .5));
  transition: border-color var(--bf-ease), transform var(--bf-ease);
}

.page-about .ab-partner-card:hover {
  border-color: rgba(43, 227, 198, .5);
  transform: translateY(-2px);
}

.page-about .ab-partner-card__num {
  margin: 0 0 .5rem;
  font-size: 1.5rem;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--bf-cyan-500);
}

.page-about .ab-partner-card__title {
  margin: 0 0 .45rem;
  font-size: .98rem;
  line-height: 1.4;
  font-weight: 700;
  color: var(--bf-ice-50);
}

.page-about .ab-partner-card__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(244, 235, 221, .8);
}

.page-about .ab-fold {
  margin-top: 1.35rem;
  border: 1px solid var(--ab-line);
  border-radius: 14px;
  background: rgba(3, 11, 18, .4);
  transition: border-color var(--bf-ease);
}

.page-about .ab-fold:hover,
.page-about .ab-fold[open] {
  border-color: var(--bf-line-cyan);
}

.page-about .ab-fold__summary {
  padding: 1rem 1.1rem;
  cursor: pointer;
  list-style: none;
  font-size: .95rem;
  font-weight: 600;
  color: var(--bf-cyan-500);
}

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

.page-about .ab-fold__summary::after {
  content: " ↓";
  font-family: var(--bf-font-mono);
  color: var(--bf-cyan-500);
}

.page-about .ab-fold[open] .ab-fold__summary::after {
  content: " ↑";
}

.page-about .ab-fold__summary:focus-visible {
  outline: 2px solid var(--bf-cyan-500);
  outline-offset: 2px;
  border-radius: 12px;
}

.page-about .ab-fold__panel {
  padding: 0 1.1rem 1.1rem;
}

.page-about .ab-list {
  margin: 0;
  padding-left: 1.1rem;
  display: grid;
  gap: .5rem;
}

.page-about .ab-list li {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 235, 221, .84);
}

.page-about .ab-list strong {
  color: var(--bf-ice-50);
  font-weight: 600;
}

.page-about .ab-honor {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .75rem 1.1rem;
  margin-top: 1.35rem;
  padding: 1rem 1.15rem;
  border-left: 2px solid var(--bf-clay-500);
  background: rgba(185, 107, 75, .1);
  border-radius: 0 12px 12px 0;
}

.page-about .ab-honor__num {
  margin: 0;
  font-size: 1.15rem;
  letter-spacing: .04em;
  color: var(--bf-cream-100);
}

.page-about .ab-honor__text {
  flex: 1 1 16rem;
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 235, 221, .86);
}

/* ---------- 内容标准 ---------- */
.page-about .ab-standards {
  display: grid;
  gap: 1px;
  margin: 1.5rem 0 1.6rem;
  padding: 0;
  list-style: none;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
  border-radius: 14px;
  overflow: hidden;
}

.page-about .ab-standards__item {
  background: var(--bf-deep-700);
  padding: 1rem 1.1rem;
}

.page-about .ab-standards__num {
  margin: 0 0 .4rem;
  font-size: .95rem;
  letter-spacing: .02em;
  color: var(--bf-coral-500);
}

.page-about .ab-standards__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(244, 235, 221, .84);
}

/* ---------- CTA ---------- */
.page-about .ab-cta {
  margin-top: clamp(2rem, 5vw, 3.5rem);
  padding-block: clamp(2rem, 5vw, 3.25rem);
  border-top: 1px solid var(--bf-line-cyan);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(43, 227, 198, .16), rgba(43, 227, 198, 0) 62%),
    var(--bf-midnight-950);
}

.page-about .ab-cta__inner {
  display: grid;
  gap: 1.5rem;
}

.page-about .ab-cta__title {
  margin: 0 0 .6rem;
  font-family: var(--bf-font-display);
  font-size: clamp(1.3rem, 3.6vw, 1.75rem);
  line-height: 1.3;
  font-weight: 800;
  color: var(--bf-ice-50);
}

.page-about .ab-cta__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 235, 221, .82);
}

.page-about .ab-cta__links {
  display: grid;
  gap: .6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-cta__link {
  display: flex;
  align-items: center;
  gap: .8rem;
  padding: .95rem 1.1rem;
  border: 1px solid var(--bf-line-cyan);
  border-radius: 999px;
  text-decoration: none;
  font-size: .95rem;
  font-weight: 600;
  color: var(--bf-cream-100);
  transition: border-color var(--bf-ease), background-color var(--bf-ease), color var(--bf-ease);
}

.page-about .ab-cta__link .bf-mono {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--bf-cyan-500);
}

.page-about .ab-cta__link:hover,
.page-about .ab-cta__link:focus-visible {
  background: rgba(43, 227, 198, .14);
  border-color: var(--bf-cyan-500);
  color: var(--bf-cyan-500);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 860px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: end;
    gap: clamp(2rem, 5vw, 3.5rem);
  }

  .page-about .ab-tree {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: .9rem;
    padding-top: .75rem;
    position: relative;
  }

  .page-about .ab-tree::before {
    content: "";
    position: absolute;
    left: 1.1rem;
    right: 1.1rem;
    top: 0;
    height: 1px;
    background: linear-gradient(90deg, rgba(43, 227, 198, .55), rgba(43, 227, 198, .08));
  }

  .page-about .ab-tree__node::before {
    content: "";
    position: absolute;
    left: 1.15rem;
    top: -.75rem;
    width: 1px;
    height: .75rem;
    background: rgba(43, 227, 198, .45);
  }

  .page-about .ab-media-row {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    align-items: start;
    gap: clamp(1.5rem, 4vw, 2.5rem);
  }

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

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

  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    align-items: center;
    gap: clamp(1.5rem, 4vw, 3rem);
  }
}

@media (min-width: 1000px) {
  .page-about .ab-sec {
    display: grid;
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(1.5rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .ab-sec__head {
    position: sticky;
    top: 6.5rem;
    flex-direction: column;
    align-items: flex-start;
    gap: .5rem;
    margin-bottom: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tree__node,
  .page-about .ab-partner-card,
  .page-about .ab-step__summary::after,
  .page-about .ab-cta__link,
  .page-about .ab-index__list a {
    transition: none;
  }

  .page-about .ab-tree__node:hover,
  .page-about .ab-partner-card:hover {
    transform: none;
  }
}
<<<END>>>