.page-about {
  --ab-rail-w: 15rem;
  --ab-pad: clamp(1.15rem, 4vw, 3.5rem);
  --ab-gap: clamp(1.5rem, 4vw, 3.5rem);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .breadcrumb {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(1rem, 2.5vw, 1.5rem) var(--ab-pad) 0;
}

.page-about .ab-inline-link {
  color: var(--ridge-brown);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-about .ab-inline-link:hover,
.page-about .ab-inline-link:focus-visible {
  color: var(--sand-orange);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(1.25rem, 3vw, 2.5rem) var(--ab-pad) clamp(2.25rem, 5vw, 4.5rem);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: var(--ab-gap);
  align-items: end;
}

.page-about .ab-hero__title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2.35rem, 7.2vw, 5.2rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  margin: 0.6rem 0 0;
  max-width: 18ch;
}

.page-about .ab-hero__lede {
  margin: clamp(1rem, 2.5vw, 1.6rem) 0 0;
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  line-height: 1.85;
  max-width: 58ch;
  color: var(--ink);
}

.page-about .ab-hero__meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin: clamp(1.4rem, 3vw, 2.2rem) 0 0;
  padding-top: 1.1rem;
  border-top: 2px solid var(--ink);
}

.page-about .ab-hero__meta-item {
  display: grid;
  gap: 0.3rem;
}

.page-about .ab-hero__meta-item dt {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ridge-brown);
}

.page-about .ab-hero__meta-item dd {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1rem, 2vw, 1.3rem);
  letter-spacing: -0.01em;
}

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

.page-about .media-frame {
  position: relative;
  overflow: hidden;
  border: var(--line);
  border-radius: var(--radius);
  background: var(--snow-cyan);
  box-shadow: var(--shadow);
}

.page-about .media-frame--portrait .media-frame__img {
  aspect-ratio: 4 / 5;
}

.page-about .media-frame--landscape .media-frame__img {
  aspect-ratio: 3 / 2;
}

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

.page-about .ab-plate {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.4rem 1rem;
  margin-top: 0.7rem;
  padding-top: 0.55rem;
  border-top: 1px dashed var(--snow-gray);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ridge-brown);
}

.page-about .ab-plate__city {
  color: var(--sand-orange);
}

/* ---------- 通用章节骨架 ---------- */
.page-about .ab-section {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(2.25rem, 5.5vw, 4.5rem) var(--ab-pad);
  border-top: 2px solid var(--ink);
}

.page-about .ab-section__grid {
  display: grid;
  gap: clamp(1.1rem, 3vw, 2rem);
}

.page-about .ab-rail__index {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 5vw, 4rem);
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: var(--sand-orange);
}

.page-about .ab-rail__note {
  margin: 0.8rem 0 0;
  padding-left: 0.85rem;
  border-left: 3px solid var(--sand-orange);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.85;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ridge-brown);
}

.page-about .ab-heading {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1.65rem, 3.8vw, 2.9rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 0 0 0.9rem;
  max-width: 20ch;
}

.page-about .ab-text {
  margin: 0 0 1.1rem;
  font-size: clamp(0.98rem, 1.35vw, 1.1rem);
  line-height: 1.85;
  max-width: 62ch;
}

.page-about .ab-quote {
  margin: clamp(1.5rem, 3.5vw, 2.4rem) 0 0;
  padding: clamp(1.15rem, 3vw, 1.9rem);
  border: var(--line);
  border-radius: var(--radius);
  background: var(--snow-cyan);
  box-shadow: 6px 6px 0 rgba(17, 17, 17, 0.12);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1.1rem, 2.6vw, 1.75rem);
  line-height: 1.45;
  letter-spacing: -0.01em;
  max-width: 46ch;
}

.page-about .ab-quote__cite {
  display: block;
  margin-top: 0.9rem;
  font-family: var(--font-mono);
  font-style: normal;
  font-weight: 400;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ridge-brown);
}

/* ---------- 时间轴手风琴 ---------- */
.page-about .ab-timeline {
  margin-top: clamp(1.4rem, 3vw, 2.2rem);
  border-top: 2px solid var(--ink);
}

.page-about .ab-timeline .accordion__item {
  border-bottom: 2px solid var(--ink);
}

.page-about .ab-timeline .accordion__trigger {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 1rem 0;
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .ab-timeline .accordion__trigger:focus-visible {
  outline: 3px solid var(--data-blue);
  outline-offset: 3px;
}

.page-about .ab-phase__tag {
  flex: none;
  padding: 0.25rem 0.55rem;
  border: 1px solid var(--snow-gray);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--ridge-brown);
  white-space: nowrap;
}

.page-about .ab-phase__title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1rem, 2.2vw, 1.35rem);
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.page-about .ab-timeline .accordion__trigger[aria-expanded="true"] .ab-phase__tag {
  background: var(--sand-orange);
  border-color: var(--sand-orange);
  color: var(--paper);
}

.page-about .ab-timeline .accordion__icon {
  position: relative;
  width: 1.5rem;
  height: 1.5rem;
  border: 2px solid var(--ink);
  border-radius: 50%;
  flex: none;
}

.page-about .ab-timeline .accordion__icon::before,
.page-about .ab-timeline .accordion__icon::after {
  content: "";
  position: absolute;
  left: 25%;
  right: 25%;
  top: 50%;
  height: 2px;
  background: var(--ink);
  transform: translateY(-50%);
}

.page-about .ab-timeline .accordion__icon::after {
  transform: translateY(-50%) rotate(90deg);
  transition: opacity 0.2s ease;
}

.page-about .ab-timeline .accordion__trigger[aria-expanded="true"] .accordion__icon::after {
  opacity: 0;
}

.page-about .ab-timeline .accordion__panel-inner {
  padding: 0 0 1.35rem;
}

.page-about .ab-timeline .accordion__panel-inner .ab-text:last-child {
  margin-bottom: 0;
}

/* ---------- 数据流程 ---------- */
.page-about .ab-steps {
  list-style: none;
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .ab-step {
  display: grid;
  gap: 0.35rem;
  padding: 1.1rem 1.15rem 1.25rem;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background: var(--paper);
}

.page-about .ab-step__num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--sand-orange);
}

.page-about .ab-step__title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}

.page-about .ab-step__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--ridge-brown);
}

.page-about .ab-flow__figure {
  margin: clamp(1.5rem, 3.5vw, 2.4rem) 0 0;
}

/* ---------- 深色统计带 ---------- */
.page-about .ab-band {
  margin-top: clamp(1.5rem, 4vw, 3rem);
  padding: clamp(2.2rem, 5.5vw, 4.2rem) var(--ab-pad);
  background: var(--night-blue);
  color: var(--paper);
}

.page-about .ab-band__inner {
  max-width: var(--shell);
  margin: 0 auto;
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
}

.page-about .ab-band .eyebrow {
  color: var(--snow-cyan);
}

.page-about .ab-band__title {
  margin: 0.6rem 0 0;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  max-width: 16ch;
}

.page-about .ab-band__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.5rem;
}

.page-about .ab-band__item {
  padding-top: 0.9rem;
  border-top: 2px solid rgba(191, 227, 224, 0.35);
}

.page-about .ab-band__value {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}

.page-about .ab-band__num {
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 6vw, 3.8rem);
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--field-green);
}

.page-about .ab-band__unit {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--snow-cyan);
}

.page-about .ab-band__label {
  margin: 0.65rem 0 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--snow-gray);
  max-width: 26ch;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.5rem);
  margin-top: 0.5rem;
}

.page-about .ab-team__total {
  padding-bottom: 1.2rem;
  border-bottom: 2px solid var(--ink);
}

.page-about .ab-team__num {
  font-family: var(--font-mono);
  font-size: clamp(3rem, 8vw, 5.2rem);
  line-height: 0.9;
  letter-spacing: -0.06em;
  color: var(--sand-orange);
}

.page-about .ab-team__unit {
  margin-left: 0.35rem;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.1rem;
}

.page-about .ab-team__caption {
  margin: 0.8rem 0 0;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--ridge-brown);
  max-width: 30ch;
}

.page-about .ab-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.page-about .ab-team__card {
  padding-top: 0.85rem;
  border-top: 3px solid var(--sand-orange);
}

.page-about .ab-team__card-num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  letter-spacing: -0.03em;
}

.page-about .ab-team__card-title {
  margin: 0.3rem 0 0.45rem;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.page-about .ab-team__card-text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--ridge-brown);
}

/* ---------- 认证与合作 ---------- */
.page-about .ab-trust {
  display: grid;
  gap: clamp(1.4rem, 3vw, 2.4rem);
  margin-top: clamp(1.2rem, 3vw, 2rem);
}

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

.page-about .ab-trust__list {
  margin: 0;
  display: grid;
  gap: 1.1rem;
}

.page-about .ab-trust__item {
  padding: 0.9rem 0 1rem;
  border-bottom: 1px solid var(--snow-gray);
}

.page-about .ab-trust__item:first-child {
  border-top: 1px solid var(--snow-gray);
}

.page-about .ab-trust__term {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sand-orange);
}

.page-about .ab-trust__desc {
  margin: 0.45rem 0 0;
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ---------- 规模网格 ---------- */
.page-about .ab-scale {
  list-style: none;
  margin: clamp(1.3rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  border-top: 2px solid var(--ink);
  border-left: 2px solid var(--ink);
}

.page-about .ab-scale__item {
  padding: 1.1rem 1.15rem 1.3rem;
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  display: grid;
  gap: 0.25rem;
  align-content: start;
}

.page-about .ab-scale__num {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4.6vw, 2.9rem);
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--sand-orange);
}

.page-about .ab-scale__unit {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
}

.page-about .ab-scale__label {
  margin: 0.2rem 0 0;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--ridge-brown);
}

/* ---------- 结尾引导 ---------- */
.page-about .ab-next {
  margin-top: clamp(1.5rem, 4vw, 3rem);
  padding: clamp(2.2rem, 5.5vw, 4rem) var(--ab-pad);
  background: var(--snow-cyan);
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
}

.page-about .ab-next__inner {
  max-width: var(--narrow);
  margin: 0 auto;
}

.page-about .ab-next__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.7rem, 4.5vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
}

.page-about .ab-next__text {
  margin: 0.9rem 0 0;
  font-size: clamp(0.98rem, 1.4vw, 1.08rem);
  line-height: 1.85;
}

.page-about .ab-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .ab-next__links {
  list-style: none;
  margin: clamp(1.2rem, 3vw, 1.8rem) 0 0;
  padding: 1rem 0 0;
  border-top: 1px dashed rgba(17, 17, 17, 0.35);
  display: grid;
  gap: 0.6rem;
  font-size: 0.92rem;
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .ab-band__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .ab-section__grid {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.5rem);
  }

  .page-about .ab-rail {
    position: sticky;
    top: 6.5rem;
    align-self: start;
  }

  .page-about .ab-band__inner {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 2fr);
    align-items: end;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.9fr);
    align-items: start;
    gap: clamp(1.5rem, 3vw, 2.5rem);
  }

  .page-about .ab-team__total {
    border-bottom: 0;
    border-right: 2px solid var(--ink);
    padding: 0 1.5rem 0 0;
  }

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

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

@media (min-width: 1100px) {
  .page-about {
    --ab-rail-w: 17rem;
  }

  .page-about .ab-timeline .accordion__trigger {
    gap: 1.25rem;
    padding: 1.15rem 0;
  }
}

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