.page-about {
  --ab-line: rgba(169, 184, 204, .2);
  --ab-line-strong: rgba(169, 184, 204, .42);
  --ab-cut: 18px;
  background-color: var(--bs-ink);
  color: var(--bs-paper);
  overflow-x: hidden;
}

.page-about .ab-h2 {
  margin: 0 0 clamp(14px, 1.8vw, 22px);
  font-size: clamp(1.55rem, 3.4vw, 2.55rem);
  font-weight: 300;
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--bs-paper);
}

.page-about .bs-index {
  margin: 0 0 14px;
  color: var(--bs-silver);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: calc(var(--bs-bar) + 36px) 0 clamp(52px, 8vw, 92px);
  background-color: var(--bs-ink);
  background-image: radial-gradient(120% 100% at 92% 0%, rgba(18, 41, 74, .95), rgba(5, 11, 24, 0) 62%);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 60px);
}

.page-about .ab-hero__lead .bs-breadcrumb {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .ab-hero .bs-display {
  margin: 0;
  max-width: 15ch;
}

.page-about .ab-hero .bs-lede {
  max-width: 46ch;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  color: var(--bs-silver);
}

.page-about .ab-hero__stats {
  display: grid;
  gap: 1px;
  align-self: end;
  padding: 1px;
  background-color: var(--ab-line-strong);
  clip-path: polygon(22px 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%, 0 22px);
}

.page-about .ab-stat {
  display: grid;
  gap: 7px;
  padding: clamp(16px, 2.4vw, 24px);
  background-color: var(--bs-navy);
}

.page-about .ab-stat__num {
  font-family: var(--bs-mono);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: .03em;
  color: var(--bs-paper);
}

.page-about .ab-stat:first-child .ab-stat__num {
  color: var(--bs-signal);
}

.page-about .ab-stat__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--bs-silver);
}

/* ---------- 起点 ---------- */
.page-about .ab-origin__grid {
  display: grid;
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
}

.page-about .ab-origin__body p {
  max-width: 60ch;
  margin: 0 0 1.05em;
  line-height: 1.85;
  color: var(--bs-silver);
}

.page-about .ab-origin__sign {
  margin-top: clamp(20px, 3vw, 30px);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--bs-signal);
  text-transform: uppercase;
}

.page-about .ab-origin__fig {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--ab-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .ab-origin__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  filter: saturate(.85) contrast(1.05);
}

/* ---------- 流程带 ---------- */
.page-about .ab-flow {
  position: relative;
  padding: clamp(52px, 8vw, 92px) 0;
  background-color: var(--bs-navy);
  background-image: repeating-linear-gradient(12deg, rgba(169, 184, 204, .055) 0 1px, transparent 1px 26px);
  border-top: 1px solid var(--ab-line);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-flow__lede {
  max-width: 58ch;
  margin: 0;
  color: var(--bs-silver);
  line-height: 1.8;
}

.page-about .ab-flow__banner {
  display: block;
  width: min(100% - 2 * var(--bs-gutter), var(--bs-max));
  margin: clamp(26px, 4vw, 46px) auto;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .ab-flow__banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 2vw, 18px);
}

.page-about .ab-step {
  padding: clamp(20px, 2.4vw, 26px);
  background-color: var(--bs-panel);
  border-top: 1px solid var(--ab-line-strong);
  clip-path: polygon(var(--ab-cut) 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%, 0 var(--ab-cut));
}

.page-about .ab-step__no {
  display: block;
  margin-bottom: 12px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--bs-silver);
}

.page-about .ab-step__title {
  margin: 0 0 10px;
  font-size: 1.06rem;
  font-weight: 500;
  line-height: 1.35;
  color: var(--bs-paper);
}

.page-about .ab-step__time {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 10px;
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--bs-signal);
  border: 1px solid rgba(53, 240, 160, .38);
  background-color: rgba(53, 240, 160, .07);
}

.page-about .ab-step__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--bs-silver);
}

/* ---------- 团队 ---------- */
.page-about .ab-sec-head {
  max-width: 62ch;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .ab-sec-head__lede {
  margin: 0;
  line-height: 1.8;
  color: var(--bs-silver);
}

.page-about .ab-team {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 1.6vw, 18px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .ab-team__card {
  display: grid;
  gap: 9px;
  padding: clamp(18px, 2vw, 24px);
  background-color: var(--bs-navy);
  border: 1px solid var(--ab-line);
  transition: border-color .3s var(--bs-ease), background-color .3s var(--bs-ease);
}

.page-about .ab-team__card:hover {
  border-color: var(--bs-signal);
  background-color: var(--bs-panel);
}

.page-about .ab-team__no {
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--bs-silver);
}

.page-about .ab-team__name {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 500;
  color: var(--bs-paper);
}

.page-about .ab-team__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--bs-silver);
}

/* ---------- 数据（浅色段） ---------- */
.page-about .ab-data {
  padding: clamp(52px, 8vw, 92px) 0;
  background-color: var(--bs-paper);
  color: var(--bs-ink);
}

.page-about .ab-data__inner {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .ab-data .bs-index {
  color: var(--bs-signal-deep);
}

.page-about .ab-data .ab-h2 {
  color: var(--bs-ink);
}

.page-about .ab-data__intro p {
  max-width: 54ch;
  margin: 0;
  line-height: 1.85;
  color: #3c4b60;
}

.page-about .ab-data__panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  padding: 1px;
  background-color: rgba(5, 11, 24, .16);
  border: 1px solid rgba(5, 11, 24, .16);
}

.page-about .ab-metric {
  display: grid;
  gap: 6px;
  padding: clamp(16px, 2.4vw, 26px);
  background-color: var(--bs-paper);
}

.page-about .ab-metric__num {
  font-family: var(--bs-mono);
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: .01em;
  color: var(--bs-ink);
}

.page-about .ab-metric__label {
  font-size: 12.5px;
  line-height: 1.55;
  color: #465871;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background-image: linear-gradient(180deg, var(--bs-silver), rgba(169, 184, 204, .12));
}

.page-about .ab-timeline__item {
  position: relative;
  padding-left: 30px;
  padding-bottom: clamp(16px, 2.2vw, 24px);
}

.page-about .ab-timeline__dot {
  position: absolute;
  left: 0;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background-color: var(--bs-ink);
  border: 1px solid var(--bs-silver);
}

.page-about .ab-timeline__item--now .ab-timeline__dot {
  background-color: var(--bs-signal);
  border-color: var(--bs-signal);
  box-shadow: 0 0 0 4px rgba(53, 240, 160, .16);
}

.page-about .ab-timeline__fold summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: 3px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-timeline__fold summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--bs-mono);
  font-size: 13px;
  color: var(--bs-silver);
}

.page-about .ab-timeline__fold[open] summary::after {
  content: "－";
  color: var(--bs-signal);
}

.page-about .ab-timeline__fold summary:focus-visible {
  outline: 2px solid var(--bs-signal);
  outline-offset: 4px;
}

.page-about .ab-timeline__year {
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--bs-silver);
}

.page-about .ab-timeline__item--now .ab-timeline__year {
  color: var(--bs-signal);
}

.page-about .ab-timeline__title {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--bs-paper);
}

.page-about .ab-timeline__body {
  max-width: 62ch;
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--bs-silver);
}

/* ---------- 协作与资质 ---------- */
.page-about .ab-partner__card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--ab-line);
  background-color: var(--bs-navy);
}

.page-about .ab-partner__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .2;
  pointer-events: none;
}

.page-about .ab-partner__body {
  position: relative;
  padding: clamp(26px, 4vw, 52px);
}

.page-about .ab-partner .bs-index {
  color: var(--bs-silver);
}

.page-about .ab-partner__body > p {
  max-width: 56ch;
  margin: 0 0 clamp(20px, 3vw, 32px);
  line-height: 1.85;
  color: var(--bs-silver);
}

.page-about .ab-partner__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 22px);
}

.page-about .ab-partner__item {
  padding-left: 14px;
  border-left: 2px solid rgba(53, 240, 160, .45);
}

.page-about .ab-partner__itemtitle {
  margin: 0 0 6px;
  font-size: .98rem;
  font-weight: 500;
  color: var(--bs-paper);
}

.page-about .ab-partner__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--bs-silver);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  padding: clamp(52px, 8vw, 96px) 0 0;
  background-image: linear-gradient(180deg, rgba(18, 41, 74, 0), rgba(18, 41, 74, .55));
}

.page-about .ab-cta__title {
  margin: 0 0 14px;
  font-size: clamp(1.5rem, 3.2vw, 2.3rem);
  font-weight: 300;
  line-height: 1.2;
  color: var(--bs-paper);
}

.page-about .ab-cta__lede {
  max-width: 54ch;
  margin: 0 0 clamp(22px, 3vw, 32px);
  line-height: 1.85;
  color: var(--bs-silver);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .ab-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

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

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }

  .page-about .ab-origin__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

  .page-about .ab-origin__fig {
    margin-top: clamp(8px, 2vw, 24px);
  }

  .page-about .ab-data__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
  }

  .page-about .ab-timeline__item {
    padding-left: 40px;
  }

  .page-about .ab-timeline::before {
    left: 5px;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-team {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team__card {
    transition: none;
  }
}
<<<END>>>