.page-about {
  --ab-tilt: -1.15deg;
  --ab-hair: rgba(242, 236, 227, .16);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-top: clamp(100px, 14vw, 172px);
  padding-bottom: clamp(36px, 6vw, 72px);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 56px);
  align-items: end;
}

.page-about .ab-hero__media {
  margin: 0;
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--ab-hair);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  filter: saturate(.72) contrast(1.06) brightness(.9);
}

.page-about .ab-hero__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .05em;
  color: var(--cyan-ink);
  background: var(--cyan);
}

.page-about .ab-hero__crumbs {
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  font-size: .8125rem;
  color: var(--mist);
}

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

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

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(2rem, 6.4vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .ab-mark {
  display: inline;
  background: var(--chu);
  color: var(--white);
  padding: .04em .18em .08em;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

.page-about .ab-hero__lede {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  max-width: 34em;
  color: var(--paper);
  opacity: .92;
}

.page-about .ab-hero__stamp {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--ab-hair);
  font-size: .875rem;
  letter-spacing: .02em;
  color: var(--mist);
}

/* ---------- 通用区块头 ---------- */
.page-about .ab-head {
  margin-bottom: clamp(28px, 4.4vw, 52px);
}

.page-about .ab-head__note {
  margin: 8px 0 0;
  color: var(--mist);
  font-size: .9375rem;
  max-width: 40em;
}

/* ---------- 我们是谁 ---------- */
.page-about .ab-identity__lead {
  max-width: 62em;
}

.page-about .ab-identity__lead p {
  margin: 0 0 1em;
  color: var(--paper);
  opacity: .9;
}

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

.page-about .ab-metrics {
  list-style: none;
  margin: clamp(30px, 4.6vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-hair);
  border-top: 2px solid var(--gold);
}

.page-about .ab-metric {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(18px, 3vw, 30px) clamp(14px, 2.4vw, 24px);
  background: var(--ink);
}

.page-about .ab-metric__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.9rem, 5.4vw, 3.2rem);
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--cyan);
}

.page-about .ab-metric__label {
  font-size: .875rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 服务范围 ---------- */
.page-about .ab-reach .section-head__title {
  color: var(--paper);
}

.page-about .ab-reach__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 58px);
}

.page-about .ab-reach__lead {
  margin: 0 0 clamp(24px, 3.4vw, 34px);
  max-width: 32em;
  color: var(--paper);
  opacity: .92;
}

.page-about .ab-reach__sub {
  margin: 0 0 14px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: .02em;
}

.page-about .ab-reach__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(24px, 3.4vw, 34px);
  padding: 0;
}

.page-about .ab-reach__tags li {
  font-size: .875rem;
  font-weight: 600;
  padding: 7px 16px;
  border: 1px solid rgba(63, 224, 206, .42);
  border-radius: var(--radius-pill);
  color: var(--paper);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .ab-reach__tags li:hover {
  background: var(--cyan);
  color: var(--cyan-ink);
  border-color: var(--cyan);
}

.page-about .ab-reach__specs {
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 30px);
  padding: 0;
}

.page-about .ab-reach__specs li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px solid rgba(242, 236, 227, .16);
}

.page-about .ab-reach__specs li:first-child {
  border-top: 1px solid rgba(242, 236, 227, .16);
}

.page-about .ab-reach__spec-k {
  min-width: 5.6em;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-about .ab-reach__spec-v {
  font-size: .9375rem;
  color: var(--paper);
}

.page-about .ab-reach__link {
  margin: 0;
  font-size: .9375rem;
  color: var(--mist);
}

.page-about .ab-reach__link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 224, 206, .5);
  transition: border-color var(--dur) var(--ease);
}

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

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

.page-about .ab-grid-map {
  height: 128px;
  margin-top: 18px;
  background-image:
    radial-gradient(circle, rgba(63, 224, 206, .85) 2px, transparent 2.6px),
    radial-gradient(circle, rgba(63, 224, 206, .3) 1.4px, transparent 2px);
  background-size: 26px 26px, 13px 13px;
  background-position: 0 0, 7px 7px;
  -webkit-mask-image: linear-gradient(100deg, rgba(0, 0, 0, .1), #000 40%, #000 68%, rgba(0, 0, 0, .18));
  mask-image: linear-gradient(100deg, rgba(0, 0, 0, .1), #000 40%, #000 68%, rgba(0, 0, 0, .18));
}

.page-about .ab-reach__mapnote {
  margin: 10px 0 0;
  font-size: .8125rem;
  letter-spacing: .02em;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
}

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

.page-about .ab-ruler__cap {
  display: block;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .22em;
  color: var(--mist);
  text-transform: uppercase;
  margin-bottom: 18px;
}

.page-about .ab-ruler__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 6px;
  position: relative;
}

.page-about .ab-ruler__list::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line-strong);
}

.page-about .ab-ruler__item {
  position: relative;
  padding: 30px 0 30px 30px;
  font-family: var(--font-mono);
  font-size: .875rem;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-about .ab-ruler__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-2);
  border: 1px solid var(--mist);
  transform: translateY(-50%);
}

.page-about .ab-ruler__item.is-now {
  color: var(--cyan);
}

.page-about .ab-ruler__item.is-now::before {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(63, 224, 206, .16);
}

.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2.6vw, 26px);
}

.page-about .ab-step__box {
  border: 1px solid var(--ab-hair);
  border-left: 3px solid var(--chu);
  background: linear-gradient(180deg, rgba(242, 236, 227, .048), rgba(242, 236, 227, .01));
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .ab-step__box[open] {
  border-left-color: var(--cyan);
  background: linear-gradient(180deg, rgba(242, 236, 227, .07), rgba(242, 236, 227, .015));
}

.page-about .ab-step__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: clamp(16px, 2.4vw, 22px) clamp(16px, 2.6vw, 26px);
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-step__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -3px;
}

.page-about .ab-step__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .ab-step__title {
  font-size: clamp(1rem, 2.2vw, 1.1875rem);
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-step__arrow {
  position: relative;
  width: 14px;
  height: 14px;
  flex: none;
}

.page-about .ab-step__arrow::before,
.page-about .ab-step__arrow::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: var(--cyan);
  transition: transform var(--dur) var(--ease);
}

.page-about .ab-step__arrow::after {
  transform: rotate(90deg);
}

.page-about .ab-step__box[open] .ab-step__arrow::after {
  transform: rotate(0deg);
}

.page-about .ab-step__body {
  padding: 0 clamp(16px, 2.6vw, 26px) clamp(20px, 2.8vw, 28px);
  border-top: 1px solid var(--ab-hair);
  padding-top: clamp(16px, 2.4vw, 22px);
}

.page-about .ab-step__body p {
  margin: 0 0 .9em;
  max-width: 38em;
  color: var(--paper);
  opacity: .88;
}

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

.page-about .ab-step__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
}

.page-about .ab-step__more a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(233, 180, 76, .5);
  transition: border-color var(--dur) var(--ease);
}

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

/* ---------- 团队 ---------- */
.page-about .ab-team .section-head__title {
  color: var(--paper);
}

.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4.6vw, 54px);
}

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

.page-about .ab-team__lead {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 36em;
  color: var(--paper);
  opacity: .9;
}

.page-about .ab-team__roles {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-role {
  display: grid;
  grid-template-columns: minmax(5.4em, 7.4em) minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid rgba(242, 236, 227, .16);
}

.page-about .ab-role:first-child {
  border-top: 1px solid rgba(242, 236, 227, .16);
}

.page-about .ab-role__name {
  font-size: .875rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .ab-role__bar {
  display: block;
  height: 6px;
  background: rgba(242, 236, 227, .1);
  overflow: hidden;
}

.page-about .ab-role__bar i {
  display: block;
  height: 100%;
  width: var(--ab-w, 0%);
  background: linear-gradient(90deg, var(--chu), var(--gold));
  transform-origin: left center;
  transition: width .5s var(--ease);
}

.page-about .ab-role__num {
  font-family: var(--font-mono);
  font-size: .875rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .ab-role--dev { --ab-w: 45.8%; }
.page-about .ab-role--content { --ab-w: 25%; }
.page-about .ab-role--service { --ab-w: 20.8%; }
.page-about .ab-role--ops { --ab-w: 8.3%; }

.page-about .ab-team__foot {
  margin: clamp(20px, 3vw, 28px) 0 0;
  max-width: 36em;
  font-size: .9375rem;
  color: var(--mist);
}

.page-about .ab-team__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 224, 206, .5);
  transition: border-color var(--dur) var(--ease);
}

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

/* ---------- 备案与对外信息 ---------- */
.page-about .ab-legal__card {
  position: relative;
  background: var(--paper);
  color: var(--paper-ink);
  padding: clamp(26px, 4.6vw, 54px);
  border-top: 4px solid var(--chu);
}

.page-about .ab-legal__eyebrow {
  color: var(--chu-deep);
  margin: 0 0 10px;
}

.page-about .ab-legal__title {
  margin: 0 0 clamp(22px, 3.2vw, 34px);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  letter-spacing: -.01em;
  line-height: 1.2;
  color: var(--paper-ink);
}

.page-about .ab-legal__list {
  margin: 0;
  padding: 0;
}

.page-about .ab-legal__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(26, 24, 23, .14);
}

.page-about .ab-legal__row:first-child {
  border-top: 1px solid rgba(26, 24, 23, .14);
}

.page-about .ab-legal__row dt {
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: rgba(26, 24, 23, .58);
}

.page-about .ab-legal__row dd {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  font-size: .9375rem;
  color: var(--paper-ink);
}

.page-about .ab-legal__mono {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: .01em;
}

.page-about .ab-legal__note {
  font-size: .8125rem;
  color: rgba(26, 24, 23, .58);
}

.page-about .ab-legal__row dd a {
  color: var(--chu-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(124, 29, 34, .4);
  transition: border-color var(--dur) var(--ease);
}

.page-about .ab-legal__row dd a:hover,
.page-about .ab-legal__row dd a:focus-visible {
  border-bottom-color: var(--chu-deep);
}

.page-about .ab-legal__foot {
  margin: clamp(22px, 3.2vw, 32px) 0 0;
  max-width: 46em;
  font-size: .9375rem;
  color: rgba(26, 24, 23, .78);
}

.page-about .ab-legal__foot a {
  color: var(--chu-deep);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(124, 29, 34, .4);
  transition: border-color var(--dur) var(--ease);
}

.page-about .ab-legal__foot a:hover,
.page-about .ab-legal__foot a:focus-visible {
  border-bottom-color: var(--chu-deep);
}

/* ---------- 为什么选我们 ---------- */
.page-about .ab-why__head {
  background: var(--chu);
  padding: clamp(24px, 4vw, 44px) clamp(22px, 4vw, 46px);
  margin-bottom: clamp(26px, 4vw, 44px);
  position: relative;
  overflow: hidden;
}

.page-about .ab-why__head::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -60px;
  width: 200px;
  height: 200px;
  border: 1px solid rgba(255, 255, 255, .28);
  transform: rotate(18deg);
  pointer-events: none;
}

.page-about .ab-why__title {
  margin: 0;
  font-weight: 900;
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  letter-spacing: -.01em;
  line-height: 1.15;
  color: var(--white);
}

.page-about .ab-why__sub {
  margin: 10px 0 0;
  font-size: .9375rem;
  color: rgba(255, 255, 255, .86);
}

.page-about .ab-why__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 36px);
}

.page-about .ab-why__item {
  border-top: 2px solid var(--gold);
  padding-top: 18px;
}

.page-about .ab-why__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--gold);
  margin-bottom: 10px;
}

.page-about .ab-why__ititle {
  margin: 0 0 10px;
  font-size: clamp(1.0625rem, 2.2vw, 1.25rem);
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-why__item p {
  margin: 0;
  font-size: .9375rem;
  color: var(--mist);
  line-height: 1.9;
}

/* ---------- 下一页入口 ---------- */
.page-about .ab-next {
  margin-top: clamp(34px, 5vw, 58px);
  padding-top: clamp(24px, 3.4vw, 34px);
  border-top: 1px solid var(--ab-hair);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px 26px;
  justify-content: space-between;
}

.page-about .ab-next__lead {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .ab-next__links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
  padding: 0;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-legal__row {
    grid-template-columns: 8.4em minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

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

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

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 4.2fr) minmax(0, 6.8fr);
    gap: clamp(30px, 5vw, 74px);
  }

  .page-about .ab-hero__media {
    transform: rotate(var(--ab-tilt));
  }

  .page-about .ab-reach__grid {
    grid-template-columns: minmax(0, 1.28fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(32px, 5vw, 68px);
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-about .ab-timeline__grid {
    grid-template-columns: 136px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 66px);
  }

  .page-about .ab-ruler {
    display: block;
    position: -webkit-sticky;
    position: sticky;
    top: 124px;
    align-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-hero__media,
  .page-about .ab-role__bar i,
  .page-about .ab-step__arrow::after {
    transform: none;
    transition: none;
  }
}
<<<END>>>