.page-about {
  --ab-rail-w: 230px;
  --ab-content-gap: 56px;
  --ab-sec-gap: 88px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--gutter) + 16px) 0 72px;
  border-bottom: 1px solid var(--steel-500);
}

.page-about .ab-hero__visual {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.page-about .ab-hero__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.28;
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 55%);
  mask-image: linear-gradient(180deg, transparent 0%, #000 55%);
}

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

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 8vw, 68px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 20px 0 0;
  max-width: 15ch;
  color: #fff;
}

.page-about .ab-hero__lede {
  margin: 24px 0 0;
  max-width: 46rem;
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate-300);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

/* ---------- 三条承诺 ---------- */
.page-about .ab-pillars__head {
  max-width: 38rem;
}

.page-about .ab-pillars__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.4vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: #fff;
}

.page-about .ab-pillars__grid {
  display: grid;
  gap: var(--gap-block);
  margin-top: 40px;
  grid-template-columns: 1fr;
}

.page-about .ab-pillar {
  padding: 28px 24px 30px;
  background: var(--ink-700);
  border: 1px solid var(--steel-500);
  position: relative;
}

.page-about .ab-pillar--a {
  border-radius: var(--r-lg) var(--r-lg) var(--r-sm) var(--r-lg);
  background:
    linear-gradient(150deg, rgba(47, 227, 210, 0.16), transparent 68%),
    var(--ink-700);
}

.page-about .ab-pillar--b {
  border-radius: var(--r-sm) var(--r-lg) var(--r-lg) var(--r-lg);
  background:
    linear-gradient(150deg, rgba(255, 107, 74, 0.15), transparent 68%),
    var(--ink-700);
}

.page-about .ab-pillar--c {
  border-radius: var(--r-lg) var(--r-sm) var(--r-lg) var(--r-lg);
  background:
    linear-gradient(150deg, rgba(245, 194, 107, 0.13), transparent 68%),
    var(--ink-700);
}

.page-about .ab-pillar__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  color: var(--cyan-400);
  letter-spacing: 0.04em;
}

.page-about .ab-pillar__name {
  margin: 14px 0 10px;
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  letter-spacing: 0.01em;
}

.page-about .ab-pillar__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate-300);
}

/* ---------- 左右分栏主体 ---------- */
.page-about .ab-body {
  padding: 16px 0 calc(var(--gutter) * 2);
}

.page-about .ab-body__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .ab-rail {
  border-top: 1px solid var(--steel-500);
  padding-top: 16px;
}

.page-about .ab-rail__label {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--slate-300);
}

.page-about .ab-rail__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  white-space: nowrap;
  font-size: 14px;
  font-weight: 600;
  color: var(--slate-300);
  text-decoration: none;
  border: 1px solid var(--steel-500);
  border-radius: 999px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .ab-rail__link .num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan-600);
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: #fff;
  border-color: var(--cyan-400);
  outline: none;
}

.page-about .ab-rail__link:hover .num,
.page-about .ab-rail__link:focus-visible .num {
  color: var(--cyan-400);
}

.page-about .ab-content {
  min-width: 0;
}

.page-about .ab-sec {
  scroll-margin-top: 96px;
  padding-bottom: var(--ab-sec-gap);
}

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

.page-about .ab-sec__head {
  max-width: 42rem;
  margin-bottom: 32px;
}

.page-about .ab-sec__title {
  margin: 14px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 32px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: #fff;
}

.page-about .ab-sec__text {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate-300);
  max-width: 44rem;
}

.page-about .ab-sec__text:last-child {
  margin-bottom: 0;
}

/* ---------- 栏目分工 ---------- */
.page-about .ab-columns__layout {
  display: grid;
  gap: var(--gap-block);
  grid-template-columns: 1fr;
  align-items: start;
}

.page-about .ab-colgrid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .ab-colcard {
  padding: 20px 18px;
  background: var(--ink-700);
  border: 1px solid var(--steel-500);
  border-radius: var(--r-sm);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .ab-colcard:hover,
.page-about .ab-colcard:focus-within {
  border-color: var(--cyan-400);
  transform: translateY(-2px);
}

.page-about .ab-colcard__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--cyan-400);
  letter-spacing: 0.08em;
}

.page-about .ab-colcard__name {
  margin: 8px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: #fff;
}

.page-about .ab-colcard__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate-300);
}

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

.page-about .ab-figure .figure__media {
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--steel-500);
  background: var(--ink-700);
}

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

.page-about .ab-figure .figure__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate-300);
}

.page-about .ab-figure--wide {
  margin-bottom: 32px;
}

/* ---------- 时间线 ---------- */
.page-about .ab-track {
  border-radius: var(--r-md);
  background:
    radial-gradient(120% 100% at 0% 0%, rgba(47, 227, 210, 0.09), transparent 60%),
    var(--ink-700);
  border: 1px solid var(--steel-500);
  padding: 20px 0 24px;
}

.page-about .ab-track__scroller {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding: 0 20px;
  scrollbar-width: thin;
}

.page-about .ab-track__scroller:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: -2px;
}

.page-about .ab-track__list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: max-content;
}

.page-about .ab-track__item {
  position: relative;
  flex: 0 0 220px;
  width: 220px;
  padding: 30px 22px 4px 0;
  border-top: 2px solid var(--steel-500);
}

.page-about .ab-track__item::before {
  content: "";
  position: absolute;
  top: -7px;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan-400);
}

.page-about .ab-track__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--cyan-400);
  line-height: 1;
}

.page-about .ab-track__name {
  margin: 12px 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
}

.page-about .ab-track__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--slate-300);
}

/* ---------- 团队统计 ---------- */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0 0 28px;
}

.page-about .ab-stat {
  padding: 20px 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--steel-500);
  background: var(--ink-700);
}

.page-about .ab-stat__label {
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--slate-300);
}

.page-about .ab-stat__value {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-size: 14px;
  color: var(--mist-050);
}

.page-about .ab-stat__num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--coral-300);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-block);
  align-items: start;
}

.page-about .ab-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-partners__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-050);
  background: var(--ink-700);
  border-left: 2px solid var(--cyan-600);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}

.page-about .ab-partners__item .num {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--cyan-400);
  flex: 0 0 auto;
}

/* ---------- 服务准则 ---------- */
.page-about .ab-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .ab-rule {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 22px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--steel-500);
  background: var(--ink-700);
}

.page-about .ab-rule__num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--coral-500);
  letter-spacing: 0.04em;
  padding-top: 2px;
}

.page-about .ab-rule__name {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
  color: #fff;
}

.page-about .ab-rule__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate-300);
}

/* ---------- 结尾 ---------- */
.page-about .ab-cta {
  border-top: 1px solid var(--steel-500);
}

.page-about .ab-cta__inner {
  display: grid;
  gap: 24px;
  padding: 40px 28px;
  border-radius: var(--r-lg) var(--r-sm) var(--r-lg) var(--r-lg);
  background:
    radial-gradient(110% 130% at 100% 0%, rgba(47, 227, 210, 0.14), transparent 62%),
    var(--ink-700);
  border: 1px solid var(--steel-500);
}

.page-about .ab-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1.25;
  color: #fff;
}

.page-about .ab-cta__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate-300);
  max-width: 40rem;
}

.page-about .ab-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-pillars__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .ab-cta__inner {
    padding: 48px 40px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 56px 0 96px;
  }

  .page-about .ab-hero__visual {
    inset: 0 0 0 auto;
    width: 62%;
  }

  .page-about .ab-hero__img {
    opacity: 0.75;
    -webkit-mask-image: linear-gradient(102deg, transparent 4%, #000 58%);
    mask-image: linear-gradient(102deg, transparent 4%, #000 58%);
  }

  .page-about .ab-hero__title {
    max-width: 12ch;
  }

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

  .page-about .ab-body__inner {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: var(--ab-content-gap);
    align-items: start;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 40px;
    border-top: none;
    border-left: 1px solid var(--steel-500);
    padding: 0 0 0 20px;
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-rail__link {
    display: flex;
    width: 100%;
    border: none;
    border-radius: 0;
    padding: 8px 0;
    background: none;
    position: relative;
  }

  .page-about .ab-rail__link::before {
    content: "";
    position: absolute;
    left: -21px;
    top: 50%;
    width: 2px;
    height: 0;
    background: var(--cyan-400);
    transform: translateY(-50%);
    transition: height 0.3s var(--ease);
  }

  .page-about .ab-rail__link:hover::before,
  .page-about .ab-rail__link:focus-visible::before {
    height: 18px;
  }

  .page-about .ab-columns__layout {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 28px;
  }

  .page-about .ab-partners {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 32px;
  }

  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
    padding: 56px 48px;
  }

  .page-about .ab-cta__links {
    justify-content: flex-end;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-track__item {
    flex-basis: 250px;
    width: 250px;
  }

  .page-about .ab-track__scroller {
    padding: 0 28px;
  }
}
<<<PAGE_CSS_END>>>