.page-about {
  --ab-rail: 248px;
  --ab-gut: clamp(22px, 4.5vw, 68px);
  background: var(--ink);
  color: var(--mist);
}

/* 面包屑 */
.page-about .ab-crumb {
  padding-top: clamp(16px, 3vw, 28px);
}

/* 首屏 */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 7vw, 88px) 0 clamp(48px, 7vw, 92px);
  background: linear-gradient(114deg, var(--night) 0%, var(--ink) 62%, var(--char) 100%);
}
.page-about .ab-hero::before {
  content: "";
  position: absolute;
  left: 42%;
  right: -14%;
  bottom: -46%;
  height: 82%;
  background: var(--lime-veil);
  transform: rotate(-7deg);
  pointer-events: none;
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 5px;
  height: 100%;
  background: linear-gradient(180deg, var(--lime), var(--gold));
  opacity: 0.85;
}
.page-about .ab-hero > .wrap {
  position: relative;
  z-index: 1;
}
.page-about .ab-hero__kicker {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin: 0 0 20px;
  text-transform: uppercase;
}
.page-about .ab-hero__title {
  margin: 0 0 clamp(26px, 4vw, 44px);
  font-size: clamp(38px, 9vw, 84px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.03em;
  color: var(--mist);
}
.page-about .ab-hero__mark {
  color: var(--lime);
  border-bottom: 5px solid var(--lime);
  padding-bottom: 2px;
}
.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}
.page-about .ab-hero__lead {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}
.page-about .ab-figs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}
.page-about .ab-fig {
  display: grid;
  grid-template-columns: minmax(84px, auto) minmax(0, 1fr);
  align-items: baseline;
  gap: 16px;
  padding: 14px 0;
  border-top: 1px solid var(--rule);
}
.page-about .ab-fig:last-child {
  border-bottom: 1px solid var(--rule);
}
.page-about .ab-fig__num {
  font-size: clamp(20px, 2.4vw, 26px);
  color: var(--lime);
  letter-spacing: -0.02em;
}
.page-about .ab-fig__lbl {
  font-size: 13px;
  line-height: 1.6;
  color: var(--sage);
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.9fr);
    align-items: end;
  }
}

/* 章节骨架 */
.page-about .ab-sec {
  padding: clamp(52px, 8vw, 104px) 0;
}
.page-about .ab-sec--tint {
  background: linear-gradient(180deg, var(--char) 0%, var(--ink) 100%);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.page-about .ab-sec__grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}
.page-about .ab-sec__no {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
  padding-bottom: 8px;
  border-bottom: 2px solid var(--gold);
  margin-bottom: 16px;
}
.page-about .ab-sec__title {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 38px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--mist);
}
.page-about .ab-sec__body > * + * {
  margin-top: clamp(18px, 2.4vw, 28px);
}
.page-about .ab-lead {
  margin: 0;
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.85;
  color: var(--mist);
  max-width: 62ch;
}
.page-about .ab-p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--sage);
  max-width: 66ch;
}
.page-about .ab-p a,
.page-about .ab-sec__body a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 4px;
}
.page-about .ab-note {
  margin: 0;
  padding: 14px 18px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--sage);
  border-left: 3px solid var(--gold);
  background: rgba(242, 178, 60, 0.07);
}
.page-about .ab-sub {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--mist);
  letter-spacing: -0.01em;
}

@media (min-width: 900px) {
  .page-about .ab-sec__grid {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: var(--ab-gut);
  }
  .page-about .ab-sec__rail {
    position: sticky;
    top: 92px;
    align-self: start;
  }
}

/* S1 三个时刻 */
.page-about .ab-serve {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}
.page-about .ab-serve__item {
  display: flex;
  gap: clamp(14px, 2.4vw, 26px);
  padding: clamp(20px, 2.6vw, 28px) 0;
  border-bottom: 1px solid var(--rule);
}
.page-about .ab-serve__no {
  flex: 0 0 auto;
  font-size: 13px;
  color: var(--gold);
  padding-top: 4px;
}
.page-about .ab-serve__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--mist);
}
.page-about .ab-serve__text p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--sage);
  max-width: 58ch;
}

/* S2 流程 */
.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}
.page-about .ab-flow__step {
  position: relative;
  padding: 22px 22px 24px;
  background: var(--night);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--lime);
}
.page-about .ab-flow__idx {
  display: block;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--gold);
  margin-bottom: 10px;
}
.page-about .ab-flow__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
  color: var(--mist);
}
.page-about .ab-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--sage);
}
.page-about .ab-flow__figure {
  margin: 0;
}
.page-about .ab-flow__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--rule);
  filter: saturate(0.85) contrast(1.05);
}

@media (min-width: 820px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    align-items: start;
  }
  .page-about .ab-flow__step:nth-child(2) {
    margin-top: 30px;
  }
  .page-about .ab-flow__step:nth-child(3) {
    margin-top: 60px;
  }
}

/* S3 版本长卷 */
.page-about .ab-ver__head {
  max-width: 72ch;
}
.page-about .ab-ver__lead {
  margin-top: 16px;
}
.page-about .ab-axis {
  display: block;
  width: 100%;
  height: clamp(52px, 7vw, 88px);
  margin: clamp(26px, 4vw, 44px) 0 clamp(18px, 2.4vw, 28px);
}
.page-about .ab-ver {
  display: grid;
  gap: 0;
}
.page-about .ab-ver__item {
  position: relative;
  padding: 24px 0 26px 26px;
  border-left: 2px solid var(--rule);
  transition: border-color 0.35s var(--ease);
}
.page-about .ab-ver__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 32px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gold);
  transition: background 0.35s var(--ease), transform 0.35s var(--ease);
}
.page-about .ab-ver__item:hover::before,
.page-about .ab-ver__item:focus-visible::before {
  background: var(--lime);
  transform: scale(1.35);
}
.page-about .ab-ver__item:hover,
.page-about .ab-ver__item:focus-visible {
  border-left-color: var(--gold);
  outline: none;
}
.page-about .ab-ver__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 10px;
}
.page-about .ab-ver__year {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold);
}
.page-about .ab-ver__ver {
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 700;
  color: var(--mist);
}
.page-about .ab-ver__title {
  margin: 0 0 10px;
  font-size: clamp(17px, 2vw, 22px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--mist);
}
.page-about .ab-ver__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--sage);
  max-width: 62ch;
}
.page-about .ab-ver__more {
  margin-top: 10px;
  padding-left: 14px;
  border-left: 2px solid var(--rule);
  font-size: 13px;
  color: rgba(143, 167, 156, 0.85);
  transition: color 0.35s var(--ease), border-color 0.35s var(--ease);
}
.page-about .ab-ver__item:hover .ab-ver__more,
.page-about .ab-ver__item:focus-visible .ab-ver__more {
  color: var(--mist);
  border-left-color: var(--lime);
}
.page-about .ab-ver__item--now::before {
  background: var(--lime);
  box-shadow: 0 0 0 6px rgba(198, 255, 61, 0.18);
}
.page-about .ab-ver__plate {
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--rule);
  padding-left: 26px;
  padding-top: 10px;
  padding-bottom: 10px;
}
.page-about .ab-ver__plate img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--rule);
  transform: skewY(-1.2deg);
}
.page-about .ab-ver__plate figcaption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--sage);
}

@media (min-width: 820px) {
  .page-about .ab-ver__item {
    display: grid;
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 0 30px;
    padding: 30px 0 34px 34px;
  }
  .page-about .ab-ver__rail {
    display: block;
    margin-bottom: 0;
  }
  .page-about .ab-ver__year {
    display: block;
    margin-bottom: 6px;
  }
  .page-about .ab-ver__plate {
    padding-left: 34px;
    padding-top: 14px;
    padding-bottom: 18px;
  }
}

/* S4 团队 */
.page-about .ab-bar {
  display: flex;
  height: 20px;
  width: 100%;
  overflow: hidden;
  background: var(--rule);
}
.page-about .ab-bar__seg {
  transform-origin: left center;
  animation: ab-grow 0.9s var(--ease) both;
}
.page-about .ab-bar__seg--edit {
  flex: 32 0 0;
  background: var(--lime);
  animation-delay: 0.05s;
}
.page-about .ab-bar__seg--data {
  flex: 18 0 0;
  background: var(--gold);
  animation-delay: 0.15s;
}
.page-about .ab-bar__seg--tech {
  flex: 15 0 0;
  background: #4A6B62;
  animation-delay: 0.25s;
}
.page-about .ab-bar__seg--ops {
  flex: 9 0 0;
  background: #2F4A43;
  animation-delay: 0.35s;
}
@keyframes ab-grow {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}
.page-about .ab-team {
  margin: 0;
  padding: 0;
}
.page-about .ab-team__row {
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
}
.page-about .ab-team__row dt {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 700;
  color: var(--mist);
  margin-bottom: 6px;
}
.page-about .ab-team__row dt .mono {
  font-size: 12.5px;
  color: var(--gold);
  font-weight: 400;
}
.page-about .ab-team__dot {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
}
.page-about .ab-team__dot--edit {
  background: var(--lime);
}
.page-about .ab-team__dot--data {
  background: var(--gold);
}
.page-about .ab-team__dot--tech {
  background: #4A6B62;
}
.page-about .ab-team__dot--ops {
  background: #2F4A43;
}
.page-about .ab-team__row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--sage);
  max-width: 60ch;
}

/* S5 标准与荣誉 */
.page-about .ab-honors {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.page-about .ab-honors__item {
  background: var(--ink);
  padding: clamp(20px, 2.6vw, 28px);
}
.page-about .ab-honors__k {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--gold);
  border: 1px solid var(--gold);
  padding: 3px 9px;
  margin-bottom: 14px;
}
.page-about .ab-honors__item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.45;
  color: var(--mist);
}
.page-about .ab-honors__item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--sage);
}
.page-about .ab-quote {
  position: relative;
  margin: 0;
  padding: clamp(26px, 4vw, 44px);
  border: 2px solid var(--mist);
  background: transparent;
}
.page-about .ab-quote::after {
  content: "BRAND NOTE / 001";
  position: absolute;
  right: -12px;
  top: 50%;
  transform: translateY(-50%) rotate(90deg);
  transform-origin: center;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--sage);
  white-space: nowrap;
}
.page-about .ab-quote p {
  margin: 0 0 14px;
  font-size: clamp(18px, 2.4vw, 26px);
  font-weight: 800;
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--mist);
}
.page-about .ab-quote__sig {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

@media (min-width: 760px) {
  .page-about .ab-honors {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* S6 生态 */
.page-about .ab-eco {
  display: grid;
  gap: 18px;
}
.page-about .ab-eco__cell {
  padding: 24px 22px;
  background: var(--night);
  border-left: 3px solid var(--lime);
}
.page-about .ab-eco__num {
  display: block;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1;
  color: var(--lime);
  letter-spacing: -0.04em;
  margin-bottom: 10px;
}
.page-about .ab-eco__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--mist);
}
.page-about .ab-eco__cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--sage);
}
.page-about .ab-coop {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .ab-coop__item {
  padding: 18px 0 18px 20px;
  border-bottom: 1px solid var(--rule);
  border-left: 2px solid var(--rule);
  transition: border-left-color 0.3s var(--ease);
}
.page-about .ab-coop__item:hover {
  border-left-color: var(--gold);
}
.page-about .ab-coop__item h4 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 800;
  color: var(--mist);
}
.page-about .ab-coop__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--sage);
  max-width: 58ch;
}

@media (min-width: 760px) {
  .page-about .ab-eco {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* S7 服务地区 */
.page-about .ab-metrics {
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.page-about .ab-metric {
  background: var(--ink);
  padding: 18px 20px;
}
.page-about .ab-metric__num {
  display: block;
  font-size: clamp(20px, 2.6vw, 27px);
  color: var(--lime);
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}
.page-about .ab-metric__lbl {
  font-size: 13px;
  line-height: 1.6;
  color: var(--sage);
}
.page-about .ab-scene {
  margin: 0;
}
.page-about .ab-scene img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--rule);
  filter: saturate(0.7) brightness(0.82);
}
.page-about .ab-scene figcaption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sage);
}

@media (min-width: 700px) {
  .page-about .ab-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* CTA */
.page-about .ab-cta {
  padding: clamp(48px, 7vw, 92px) 0;
  background: linear-gradient(102deg, var(--char) 0%, var(--night) 70%);
  border-top: 1px solid var(--rule);
}
.page-about .ab-cta__inner {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
}
.page-about .ab-cta__title {
  margin: 0 0 12px;
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--mist);
}
.page-about .ab-cta__text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--sage);
  max-width: 56ch;
}
.page-about .ab-cta__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

@media (min-width: 880px) {
  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) auto;
    align-items: center;
  }
}

/* 动效降级 */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-bar__seg {
    animation: none;
  }
  .page-about .ab-ver__item,
  .page-about .ab-ver__item::before,
  .page-about .ab-ver__more,
  .page-about .ab-coop__item {
    transition: none;
  }
}
<<<END>>>