.page-about {
  --ab-rail: 88px;
  --ab-aside: 300px;
  --ab-soft: rgba(247, 242, 232, .07);
  --ab-soft-line: rgba(247, 242, 232, .16);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.8rem, 5vw, 4rem) clamp(2.2rem, 6vw, 4.6rem);
  background:
    radial-gradient(120% 90% at 88% 6%, rgba(224, 165, 38, .22) 0%, rgba(224, 165, 38, 0) 58%),
    linear-gradient(158deg, var(--ink) 0%, var(--ink-2) 56%, var(--ink-3) 100%);
  color: var(--sand);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -30%;
  width: 46vw;
  height: 46vw;
  max-width: 520px;
  max-height: 520px;
  border: 1px solid var(--ab-soft-line);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .ab-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 1.6rem;
}

.page-about .ab-hero__side {
  display: flex;
  align-items: baseline;
  gap: .8rem;
}

.page-about .ab-hero__stamp {
  margin: 0;
  font-size: .78rem;
  letter-spacing: .22em;
  color: var(--gold-soft);
}

.page-about .ab-hero__vertical {
  margin: 0;
  font-size: .8rem;
  letter-spacing: .28em;
  color: var(--slate);
}

.page-about .ab-crumbs {
  margin-bottom: 1.2rem;
  font-size: .82rem;
}

.page-about .ab-crumbs a,
.page-about .ab-crumbs .crumbs__sep,
.page-about .ab-crumbs span {
  color: var(--slate);
}

.page-about .ab-crumbs a:hover {
  color: var(--gold-soft);
}

.page-about .ab-hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.1rem, 7vw, 4.2rem);
  line-height: 1.1;
  letter-spacing: -.01em;
  font-weight: 900;
  color: var(--sand);
}

.page-about .ab-hero .lede {
  max-width: 40em;
  color: rgba(247, 242, 232, .82);
}

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

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.6rem;
}

.page-about .ab-vcard {
  padding: 1.15rem 1.2rem 1.25rem;
  border: 1px solid var(--ab-soft-line);
  border-radius: var(--r-md);
  background: var(--ab-soft);
}

.page-about .ab-vcard__label {
  margin: 0 0 .35rem;
  font-size: .8rem;
  letter-spacing: .16em;
  color: var(--slate);
}

.page-about .ab-vcard__ver {
  margin: 0 0 .6rem;
  font-size: clamp(1.9rem, 5vw, 2.4rem);
  font-weight: 600;
  line-height: 1;
  color: var(--gold);
}

.page-about .ab-vcard__meta,
.page-about .ab-vcard__note {
  margin: 0 0 .9rem;
  font-size: .84rem;
  line-height: 1.65;
  color: rgba(247, 242, 232, .7);
}

.page-about .ab-vcard__note {
  margin: .9rem 0 0;
}

/* ---------- 品牌起点 ---------- */
.page-about .ab-origin {
  background: var(--sand);
  color: var(--text);
}

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

.page-about .ab-origin h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.6rem, 4.4vw, 2.4rem);
  line-height: 1.25;
  color: var(--ink);
}

.page-about .ab-origin .prose p {
  margin: 0 0 1rem;
  color: var(--muted-ink);
}

.page-about .ab-origin .prose p:last-child {
  margin-bottom: 0;
}

.page-about .ab-origin__aside {
  padding: 1.2rem;
  border-radius: var(--r-md);
  background: var(--sand-card);
}

.page-about .ab-origin__asidehead {
  margin: 0 0 .9rem;
  font-size: .86rem;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--ink);
}

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

.page-about .ab-lines__item {
  padding-bottom: .9rem;
  border-bottom: 1px solid var(--line);
}

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

.page-about .ab-lines__item p {
  margin: .5rem 0 0;
  font-size: .9rem;
  line-height: 1.65;
  color: var(--muted-ink);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  background: linear-gradient(180deg, var(--sand) 0%, #fffdf8 42%, var(--sand) 100%);
}

.page-about .ab-sechead {
  max-width: 46rem;
  margin-bottom: 1.8rem;
}

.page-about .ab-sechead h2 {
  margin: .4rem 0 0;
  font-size: clamp(1.6rem, 4.6vw, 2.6rem);
  line-height: 1.22;
  color: var(--ink);
}

.page-about .ab-timeline__fig {
  margin: 0 0 2rem;
}

.page-about .ab-timeline__fig .figure__media {
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--ink);
}

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

.page-about .figure__cap {
  margin-top: .7rem;
  font-size: .82rem;
  color: var(--slate);
}

.page-about .ab-timeline__grid {
  display: grid;
  gap: 1.4rem;
}

.page-about .ab-years {
  display: flex;
  gap: .5rem;
  margin: 0 0 .4rem;
  padding: 0 0 .5rem;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-years__link {
  display: inline-flex;
  align-items: baseline;
  gap: .4rem;
  padding: .5rem .85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fffdf8;
  color: var(--muted-ink);
  font-size: .84rem;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .2s var(--ease), color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .ab-years__link .mono {
  font-size: .82rem;
  color: var(--ink);
}

.page-about .ab-years__link:hover {
  border-color: var(--gold);
  color: var(--ink);
}

.page-about .ab-years__link.is-current {
  border-color: var(--gold);
  background: var(--gold);
  color: var(--ink);
}

.page-about .ab-years__link.is-current .mono {
  color: var(--ink);
}

.page-about .ab-stack {
  display: grid;
  gap: 1rem;
}

.page-about .ab-node {
  position: relative;
  display: grid;
  gap: .9rem;
  padding: 1.2rem 1.15rem 1.25rem;
  border: 1px solid var(--line);
  border-left: 4px solid var(--ink-3);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: #fffdf8;
  box-shadow: 0 10px 26px rgba(11, 31, 51, .05);
}

.page-about .ab-node--now {
  border-left-color: var(--red);
  background: linear-gradient(160deg, #fffdf8 0%, var(--sand-card) 100%);
}

.page-about .ab-node__year {
  display: flex;
  align-items: baseline;
  gap: .6rem;
}

.page-about .ab-node__num {
  font-size: clamp(1.7rem, 5vw, 2.3rem);
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
}

.page-about .ab-node__ver {
  padding: .18rem .5rem;
  border-radius: 6px;
  background: var(--ink);
  color: var(--gold-soft);
  font-size: .78rem;
}

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

.page-about .ab-node__body h3 {
  margin: 0 0 .5rem;
  font-size: clamp(1.05rem, 3vw, 1.28rem);
  line-height: 1.35;
  color: var(--ink);
}

.page-about .ab-node__body p {
  margin: 0 0 .8rem;
  font-size: .94rem;
  line-height: 1.72;
  color: var(--muted-ink);
}

.page-about .ab-more {
  border-top: 1px dashed var(--line);
  padding-top: .6rem;
}

.page-about .ab-more summary {
  cursor: pointer;
  font-size: .86rem;
  font-weight: 600;
  color: var(--ink-3);
  list-style: none;
}

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

.page-about .ab-more summary::before {
  content: "＋ ";
  color: var(--gold);
}

.page-about .ab-more[open] summary::before {
  content: "－ ";
}

.page-about .ab-more p {
  margin: .6rem 0 0;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--muted-ink);
}

.page-about .ab-node .ky-copy {
  margin-top: .2rem;
}

/* ---------- 服务规模数据带 ---------- */
.page-about .ab-scale {
  background: linear-gradient(120deg, var(--ink) 0%, var(--ink-2) 68%, var(--ink-3) 100%);
  color: var(--sand);
}

.page-about .ab-scale__head {
  max-width: 42rem;
  margin-bottom: 1.8rem;
}

.page-about .ab-scale__head h2 {
  margin: .4rem 0 0;
  font-size: clamp(1.6rem, 4.6vw, 2.5rem);
  line-height: 1.24;
  color: var(--sand);
}

.page-about .eyebrow--light {
  color: var(--gold);
}

.page-about .ab-scale__band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--ab-soft-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .ab-scale__item {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: 1.25rem 1.1rem;
  background: rgba(18, 50, 77, .92);
}

.page-about .ab-scale__num {
  font-size: clamp(1.7rem, 6vw, 2.6rem);
  font-weight: 600;
  line-height: 1;
  color: var(--gold);
}

.page-about .ab-scale__unit {
  font-size: .82rem;
  line-height: 1.5;
  color: rgba(247, 242, 232, .74);
}

.page-about .ab-scale__foot {
  margin-top: 1.5rem;
  display: grid;
  gap: 1rem;
}

.page-about .ab-scale__foot p {
  margin: 0;
  max-width: 46rem;
  font-size: .95rem;
  line-height: 1.78;
  color: rgba(247, 242, 232, .78);
}

.page-about .ab-scale__link {
  justify-self: start;
  padding-bottom: .18rem;
  border-bottom: 1px solid var(--gold);
  color: var(--gold-soft);
  font-size: .92rem;
  text-decoration: none;
}

.page-about .ab-scale__link:hover {
  color: var(--gold);
}

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

.page-about .ab-team__grid {
  display: grid;
  gap: 1.8rem;
}

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

.page-about .ab-team__media .figure__media {
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .ab-team h2 {
  margin: .4rem 0 .9rem;
  font-size: clamp(1.6rem, 4.4vw, 2.4rem);
  line-height: 1.24;
  color: var(--ink);
}

.page-about .ab-team .lede {
  color: var(--muted-ink);
}

.page-about .ab-crews {
  display: grid;
  gap: .75rem;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-crews__item {
  padding: .95rem 1rem;
  border-radius: var(--r-sm);
  background: var(--sand-card);
  border-left: 3px solid var(--gold);
}

.page-about .ab-crews__name {
  margin: 0 0 .3rem;
  font-weight: 700;
  font-size: .98rem;
  color: var(--ink);
}

.page-about .ab-crews__desc {
  margin: 0;
  font-size: .89rem;
  line-height: 1.68;
  color: var(--muted-ink);
}

/* ---------- 资质 ---------- */
.page-about .ab-cert {
  background: #fffdf8;
}

.page-about .ab-cert__grid {
  display: grid;
  gap: 1.8rem;
}

.page-about .ab-cert h2 {
  margin: .4rem 0 .9rem;
  font-size: clamp(1.55rem, 4.4vw, 2.3rem);
  line-height: 1.26;
  color: var(--ink);
}

.page-about .ab-cert__body > p {
  margin: 0;
  max-width: 40em;
  font-size: .96rem;
  line-height: 1.78;
  color: var(--muted-ink);
}

.page-about .ab-cert__cards {
  display: grid;
  gap: .9rem;
  margin-top: 1.4rem;
}

.page-about .ab-cert__card {
  padding: 1.05rem 1.1rem;
  background: var(--sand);
}

.page-about .ab-cert__card .card__title {
  margin: 0;
  font-size: 1.1rem;
  color: var(--ink-3);
}

.page-about .ab-cert__card .card__meta {
  margin: .2rem 0 .6rem;
  font-size: .82rem;
  color: var(--slate);
}

.page-about .ab-cert__card .card__body {
  margin: 0;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--muted-ink);
}

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

.page-about .ab-cert__media .figure__media {
  border-radius: var(--r-lg);
  overflow: hidden;
}

/* ---------- 合作生态 ---------- */
.page-about .ab-eco {
  background: linear-gradient(150deg, var(--ink-2) 0%, var(--ink) 62%, #081827 100%);
  color: var(--sand);
}

.page-about .ab-eco .ab-sechead h2 {
  color: var(--sand);
}

.page-about .ab-eco__lede {
  margin: .9rem 0 0;
  font-size: .96rem;
  line-height: 1.8;
  color: rgba(247, 242, 232, .76);
}

.page-about .ab-eco__grid {
  display: grid;
  gap: .9rem;
}

.page-about .ab-eco__card {
  padding: 1.2rem 1.15rem 1.3rem;
  background: rgba(247, 242, 232, .05);
  border: 1px solid var(--ab-soft-line);
  border-radius: var(--r-md);
}

.page-about .ab-eco__card .card__title {
  margin: 0 0 .55rem;
  font-size: 1.06rem;
  color: var(--sand);
}

.page-about .ab-eco__card .card__body {
  margin: 0 0 .9rem;
  font-size: .9rem;
  line-height: 1.72;
  color: rgba(247, 242, 232, .74);
}

.page-about .ab-eco__cta {
  margin-top: 1.6rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--ab-soft-line);
}

.page-about .ab-eco__cta p {
  margin: 0;
  flex: 1 1 260px;
  font-size: .92rem;
  line-height: 1.7;
  color: rgba(247, 242, 232, .78);
}

/* ---------- 延伸入口 ---------- */
.page-about .ab-next {
  background: var(--sand);
}

.page-about .ab-next__grid {
  display: grid;
  gap: 1.6rem;
}

.page-about .ab-next__intro h2 {
  margin: .4rem 0 .8rem;
  font-size: clamp(1.5rem, 4.3vw, 2.2rem);
  line-height: 1.26;
  color: var(--ink);
}

.page-about .ab-next__intro p {
  margin: 0;
  max-width: 34em;
  font-size: .94rem;
  line-height: 1.75;
  color: var(--muted-ink);
}

.page-about .ab-next__links {
  display: grid;
  gap: .7rem;
}

.page-about .ab-nextlink {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: .2rem .9rem;
  padding: 1rem 1.1rem;
  border-radius: var(--r-sm);
  background: #fffdf8;
  border: 1px solid var(--line);
  text-decoration: none;
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .ab-nextlink:hover {
  border-color: var(--gold);
  transform: translateY(-2px);
}

.page-about .ab-nextlink__k {
  grid-row: span 2;
  font-size: .86rem;
  color: var(--gold);
  align-self: start;
  padding-top: .1rem;
}

.page-about .ab-nextlink__t {
  font-weight: 700;
  font-size: 1rem;
  color: var(--ink);
}

.page-about .ab-nextlink__d {
  font-size: .86rem;
  line-height: 1.6;
  color: var(--muted-ink);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .ab-origin__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .72fr);
    gap: 2rem;
    align-items: start;
  }

  .page-about .ab-origin__rail {
    display: none;
  }

  .page-about .ab-scale__foot {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }

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

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

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

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr) var(--ab-aside);
    gap: clamp(1.6rem, 3vw, 2.8rem);
    align-items: start;
  }

  .page-about .ab-hero__side {
    flex-direction: column;
    align-items: center;
    height: 100%;
    padding-top: .4rem;
  }

  .page-about .ab-hero__vertical {
    writing-mode: vertical-rl;
    text-orientation: upright;
    letter-spacing: .34em;
  }

  .page-about .ab-hero__aside {
    margin-top: 2.6rem;
  }

  .page-about .ab-origin__grid {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr) 280px;
    gap: clamp(1.6rem, 3vw, 2.6rem);
  }

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

  .page-about .ab-origin__aside {
    margin-top: 2.4rem;
  }

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

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.4rem);
    align-items: center;
  }

  .page-about .ab-cert__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .78fr);
    gap: clamp(2rem, 4vw, 3.2rem);
    align-items: start;
  }

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

  .page-about .ab-next__grid {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.4fr);
    gap: 2.4rem;
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-about .ab-timeline__grid {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.2rem);
    align-items: start;
  }

  .page-about .ab-timeline__rail {
    position: sticky;
    top: clamp(88px, 12vh, 120px);
    align-self: start;
  }

  .page-about .ab-years {
    flex-direction: column;
    overflow: visible;
    gap: .45rem;
    padding: 0;
  }

  .page-about .ab-years__link {
    justify-content: flex-start;
    width: 100%;
    border-radius: var(--r-sm);
  }

  .page-about .ab-node {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 1.4rem;
    padding: 1.5rem 1.6rem 1.6rem;
  }

  .page-about .ab-node__year {
    flex-direction: column;
    align-items: flex-start;
    gap: .5rem;
  }

  .page-about .ab-node--now {
    margin-left: -1.2rem;
    margin-right: 1.2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-nextlink,
  .page-about .ab-years__link {
    transition: none;
  }

  .page-about .ab-nextlink:hover {
    transform: none;
  }
}
<<<END>>>