.page-about {
  --ab-cut: 14px;
  --ab-cut-sm: 10px;
  background-color: var(--charcoal);
  background-image:
    repeating-linear-gradient(115deg, rgba(195, 210, 222, 0.045) 0 1px, transparent 1px 28px);
  color: var(--ink-base);
  font-family: var(--font-sans);
  padding-bottom: 48px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 28px 0 0;
  background:
    radial-gradient(120% 88% at 90% 6%, rgba(255, 90, 31, 0.22), transparent 58%),
    linear-gradient(162deg, #171C21 0%, var(--charcoal) 64%);
  border-bottom: 1px solid var(--line-soft);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -40px;
  right: -80px;
  width: 320px;
  height: 320px;
  background: linear-gradient(115deg, rgba(255, 138, 76, 0.18), transparent 62%);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 30% 100%);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__crumb {
  margin-bottom: 26px;
}

.page-about .ab-hero__crumb .breadcrumb__link,
.page-about .ab-hero__crumb .breadcrumb__item {
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}

.page-about .ab-hero__crumb .breadcrumb__link {
  text-decoration: none;
}

.page-about .ab-hero__crumb .breadcrumb__link:hover,
.page-about .ab-hero__crumb .breadcrumb__link:focus-visible {
  color: var(--pulse-orange);
}

.page-about .ab-hero__kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.page-about .ab-hero__kicker-idx {
  display: inline-block;
  padding: 3px 8px;
  background: var(--pulse-orange);
  color: var(--charcoal);
  font-weight: 700;
  letter-spacing: 0.1em;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 6px 100%, 0 calc(100% - 6px));
}

.page-about .ab-hero__title {
  margin: 0 0 20px;
  max-width: 20em;
  font-family: var(--font-sans);
  font-size: clamp(34px, 8.6vw, 78px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--ink-strong);
}

.page-about .ab-hero__title em {
  font-style: normal;
  color: var(--pulse-orange);
}

.page-about .ab-hero__lead {
  max-width: 52ch;
  margin: 0 0 34px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-base);
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-stats__item {
  padding: 16px 14px 18px;
  background: #14181D;
}

.page-about .ab-stats__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(28px, 6.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--pulse-orange);
}

.page-about .ab-stats__label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
}

/* ---------- 主布局 ---------- */
.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  padding: 30px 0 8px;
}

/* ---------- 左侧年份刻度 ---------- */
.page-about .ab-rail {
  display: flex;
  align-items: center;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: none;
}

.page-about .ab-rail::-webkit-scrollbar {
  display: none;
}

.page-about .ab-rail__label {
  flex: none;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--moss-bright);
  white-space: nowrap;
}

.page-about .ab-rail__years {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-rail__link {
  display: block;
  padding: 5px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  text-decoration: none;
  border: 1px solid var(--line-soft);
  white-space: nowrap;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--charcoal);
  background: var(--pulse-orange);
  border-color: var(--pulse-orange);
}

/* ---------- 叙事流 ---------- */
.page-about .ab-flow {
  min-width: 0;
}

.page-about .ab-sec {
  position: relative;
  margin: 0 0 20px;
  padding: 24px 18px 26px;
  background: var(--paper);
  color: var(--graphite);
  scroll-margin-top: 92px;
}

.page-about .ab-sec::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: var(--ab-cut);
  height: var(--ab-cut);
  background: linear-gradient(135deg, transparent 50%, var(--charcoal) 50%);
  pointer-events: none;
}

.page-about .ab-sec__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 14px;
}

.page-about .ab-sec__idx {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--read-orange);
}

.page-about .ab-sec__title {
  margin: 0;
  font-size: clamp(20px, 5.2vw, 29px);
  font-weight: 900;
  line-height: 1.26;
  letter-spacing: -0.005em;
  color: var(--charcoal);
}

.page-about .ab-sec__summary {
  margin: 0 0 20px;
  padding: 16px 18px;
  background: var(--moss);
  color: var(--ink-strong);
  font-size: 15.5px;
  line-height: 1.75;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-about .ab-sec__body p {
  margin: 0 0 13px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--graphite);
}

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

.page-about .ab-body--spaced {
  margin-top: 20px;
}

.page-about .ab-sec__body a {
  color: var(--read-orange);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .ab-sec__body a:hover,
.page-about .ab-sec__body a:focus-visible {
  color: var(--charcoal);
  background: rgba(255, 90, 31, 0.28);
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: 0 0 22px;
}

.page-about .ab-figure .figure__media {
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

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

.page-about .figure__caption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: var(--ink-dim);
}

.page-about .ab-figure--texture {
  margin-top: 4px;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 0 34px;
  list-style: none;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg,
    var(--pulse-orange) 0%,
    var(--blaze-orange) 38%,
    var(--moss-bright) 100%);
  opacity: 0.62;
}

.page-about .ab-tl {
  position: relative;
  padding-bottom: 18px;
  scroll-margin-top: 96px;
}

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

.page-about .ab-tl__node {
  position: absolute;
  left: -34px;
  top: 4px;
  display: block;
  width: 24px;
  height: 24px;
  background: var(--paper);
  z-index: 1;
}

.page-about .ab-tl__node svg {
  display: block;
  width: 24px;
  height: 24px;
}

.page-about .ab-tl__card {
  padding: 12px 14px 14px;
  background: rgba(30, 37, 43, 0.042);
  border-left: 3px solid var(--mist);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .ab-tl:hover .ab-tl__card,
.page-about .ab-tl:focus-within .ab-tl__card {
  border-left-color: var(--pulse-orange);
  background: rgba(255, 90, 31, 0.07);
}

.page-about .ab-tl__card--now {
  border-left-color: var(--pulse-orange);
  background: rgba(255, 90, 31, 0.08);
}

.page-about .ab-tl__yr {
  margin: 0 0 4px;
  font-family: var(--font-num);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--read-orange);
}

.page-about .ab-tl__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--charcoal);
}

.page-about .ab-tl__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: #3A434B;
}

/* ---------- 图文分栏 ---------- */
.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .ab-split__text p {
  margin: 0 0 13px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--graphite);
}

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

.page-about .ab-split__figure .figure__media {
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

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

/* ---------- 四步流程 ---------- */
.page-about .ab-steps {
  margin-top: 4px;
  border-top: 1px solid rgba(30, 37, 43, 0.16);
}

.page-about .ab-step {
  border-bottom: 1px solid rgba(30, 37, 43, 0.16);
}

.page-about .ab-step__sum {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 2px;
  list-style: none;
  cursor: pointer;
  color: var(--charcoal);
}

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

.page-about .ab-step__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--read-orange);
}

.page-about .ab-step__name {
  flex: 1 1 auto;
  font-size: 17px;
  font-weight: 700;
}

.page-about .ab-step__arrow {
  flex: none;
  width: 9px;
  height: 9px;
  margin-right: 4px;
  border-right: 2px solid var(--steel);
  border-bottom: 2px solid var(--steel);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}

.page-about .ab-step[open] .ab-step__arrow {
  transform: rotate(-135deg);
}

.page-about .ab-step__body {
  padding: 0 2px 16px 26px;
}

.page-about .ab-step__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: #3A434B;
}

/* ---------- 团队数字 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-team__item {
  padding: 14px 12px 16px;
  background: var(--charcoal);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}

.page-about .ab-team__item--total {
  background: var(--moss);
}

.page-about .ab-team__num {
  display: block;
  font-family: var(--font-num);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--ink-strong);
}

.page-about .ab-team__item--total .ab-team__num {
  color: var(--pulse-orange);
}

.page-about .ab-team__label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--ink-muted);
}

.page-about .ab-team__item--total .ab-team__label {
  color: var(--mist);
}

/* ---------- 数据锚点 ---------- */
.page-about .ab-nums {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  background: rgba(30, 37, 43, 0.16);
}

.page-about .ab-nums__item {
  padding: 16px 14px 18px;
  background: var(--paper);
}

.page-about .ab-nums__v {
  display: block;
  font-family: var(--font-num);
  font-size: 44px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--read-orange);
}

.page-about .ab-nums__k {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: #3A434B;
}

/* ---------- 接下来 ---------- */
.page-about .ab-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-next__item {
  position: relative;
  padding: 16px 16px 18px;
  background: var(--graphite);
  color: var(--ink-base);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-about .ab-next__idx {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--charcoal);
  background: var(--mint);
}

.page-about .ab-next__t {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink-strong);
}

.page-about .ab-next__p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-base);
}

/* ---------- 行动区 ---------- */
.page-about .ab-cta {
  margin-top: 4px;
  padding: 26px 20px 28px;
  background: var(--paper);
  background-image:
    linear-gradient(115deg, rgba(255, 90, 31, 0.14), transparent 52%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .ab-cta__title {
  margin: 0 0 10px;
  font-size: clamp(21px, 5.2vw, 30px);
  font-weight: 900;
  line-height: 1.24;
  color: var(--charcoal);
}

.page-about .ab-cta__text {
  max-width: 48ch;
  margin: 0 0 20px;
  font-size: 15.5px;
  line-height: 1.78;
  color: #3A434B;
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

.page-about .ab-cta__link {
  font-size: 15px;
  color: var(--read-orange);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

.page-about .ab-cta__link:hover,
.page-about .ab-cta__link:focus-visible {
  color: var(--charcoal);
  background: rgba(255, 90, 31, 0.3);
}

/* ---------- 断点 ---------- */
@media (min-width: 600px) {
  .page-about .ab-sec {
    padding: 28px 26px 30px;
  }

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

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

  .page-about .ab-cta {
    padding: 32px 30px 34px;
  }
}

@media (min-width: 768px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-stats__item {
    padding: 20px 18px 22px;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 24px;
    align-items: start;
  }

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

@media (min-width: 1024px) {
  .page-about {
    padding-bottom: 64px;
  }

  .page-about .ab-hero {
    padding-top: 40px;
  }

  .page-about .ab-hero__lead {
    font-size: 17px;
  }

  .page-about .ab-layout {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 44px;
    padding-top: 44px;
  }

  .page-about .ab-rail {
    display: block;
    position: sticky;
    top: 92px;
    align-self: start;
    overflow: visible;
    padding: 4px 0 0 14px;
    border-left: 1px solid var(--line-soft);
  }

  .page-about .ab-rail__label {
    margin-bottom: 12px;
  }

  .page-about .ab-rail__years {
    flex-direction: column;
    gap: 6px;
  }

  .page-about .ab-rail__link {
    padding: 6px 10px;
    font-size: 13px;
    border-color: transparent;
  }

  .page-about .ab-sec {
    padding: 36px 38px 40px;
    margin-bottom: 24px;
  }

  .page-about .ab-sec__summary {
    padding: 18px 22px;
    font-size: 16px;
    margin-bottom: 24px;
  }

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

  .page-about .ab-tl__node {
    left: -40px;
    top: 6px;
  }

  .page-about .ab-tl__card {
    padding: 14px 18px 16px;
  }

  .page-about .ab-cta {
    padding: 38px 40px 40px;
  }

  .page-about .ab-figure img,
  .page-about .ab-split__figure img {
    transition: transform 0.5s ease;
  }

  .page-about .ab-figure:hover img,
  .page-about .ab-split__figure:hover img {
    transform: scale(1.02);
  }
}

@media (min-width: 1280px) {
  .page-about .ab-hero__title {
    max-width: 16em;
  }

  .page-about .ab-layout {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .ab-sec {
    padding: 40px 44px 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }

  .page-about .ab-figure:hover img,
  .page-about .ab-split__figure:hover img {
    transform: none;
  }
}
<<<END>>>