.page-about {
  --ab-hi: #17406B;
  --ab-panel-line: rgba(47, 212, 232, .38);
  display: block;
  padding-bottom: clamp(2rem, 6vw, 4rem);
  overflow-x: hidden;
}

.page-about .wrap {
  position: relative;
}

.page-about .crumbs {
  padding-top: 1.1rem;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  padding: clamp(2.2rem, 7vw, 4.6rem) 0 clamp(2.4rem, 6vw, 4.2rem);
  border-top: 1px solid var(--cv-grid);
  border-bottom: 1px solid var(--cv-grid);
  background:
    radial-gradient(95% 130% at 90% -12%, rgba(138, 92, 255, .24), transparent 62%),
    radial-gradient(72% 110% at 4% 2%, rgba(47, 212, 232, .17), transparent 60%),
    var(--cv-deep);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(29, 60, 97, .55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(29, 60, 97, .55) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(120% 90% at 78% 0%, #000 0%, transparent 74%);
  mask-image: radial-gradient(120% 90% at 78% 0%, #000 0%, transparent 74%);
}

.page-about .ab-hero .wrap {
  z-index: 1;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 2rem;
}

.page-about .ab-hero__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cv-lime);
}

.page-about .ab-hero__title {
  margin: .85rem 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(2.1rem, 6.4vw, 4.4rem);
  line-height: 1.05;
  letter-spacing: -.015em;
  color: var(--cv-ink);
}

.page-about .ab-hero__text {
  max-width: 46ch;
  margin: 1.25rem 0 0;
  font-size: clamp(1rem, 2.4vw, 1.125rem);
  line-height: 1.78;
  color: var(--cv-muted);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.9rem;
}

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--cv-grid);
  border: 1px solid var(--cv-grid);
  clip-path: var(--cut-poly);
}

.page-about .ab-fact {
  background: var(--cv-night);
  padding: 1rem 1.05rem 1.15rem;
}

.page-about .ab-fact dt {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  color: var(--cv-dim);
}

.page-about .ab-fact dd {
  margin: .45rem 0 0;
  font-size: .95rem;
  font-weight: 600;
  color: var(--cv-ink);
}

/* ---------- 骨架布局 ---------- */

.page-about .ab-layout {
  display: grid;
  gap: 1.5rem;
  padding-top: clamp(1.75rem, 4vw, 3rem);
}

.page-about .ab-toc {
  position: sticky;
  top: var(--topbar-h);
  z-index: 3;
  padding: .6rem 0 .7rem;
  background: linear-gradient(180deg, var(--cv-deep) 72%, rgba(6, 23, 46, 0));
}

.page-about .ab-toc .toc__title {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--cv-dim);
  margin: 0 0 .5rem;
}

.page-about .ab-toc__list {
  display: flex;
  gap: .5rem;
  margin: 0;
  padding: 0 0 .35rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-toc__link {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  flex: 0 0 auto;
  padding: .42rem .8rem;
  border: 1px solid var(--cv-grid);
  background: var(--cv-night);
  clip-path: var(--cut-poly);
  color: var(--cv-muted);
  font-size: .84rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color .24s var(--ease), border-color .24s var(--ease), background .24s var(--ease);
}

.page-about .ab-toc__link:hover,
.page-about .ab-toc__link:focus-visible,
.page-about .ab-toc__link.is-current {
  color: var(--cv-ink);
  border-color: var(--ab-panel-line);
  background: var(--ab-hi);
}

.page-about .ab-toc__link.is-current .ab-toc__num {
  color: var(--cv-lime);
}

.page-about .ab-toc__num {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  color: var(--cv-cyan);
}

.page-about .ab-flow {
  min-width: 0;
}

/* ---------- 区块通用 ---------- */

.page-about .ab-section {
  padding: clamp(2.2rem, 6vw, 3.6rem) 0;
  border-top: 1px solid var(--cv-grid);
  scroll-margin-top: calc(var(--topbar-h) + 3.5rem);
}

.page-about .ab-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-section--last {
  padding-bottom: clamp(1rem, 3vw, 2rem);
}

.page-about .ab-section .section-head {
  margin-bottom: clamp(1.4rem, 3.5vw, 2.2rem);
}

.page-about .ab-section .section-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.5rem, 4.2vw, 2.4rem);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--cv-ink);
}

.page-about .ab-section .section-num {
  font-family: var(--font-mono);
  letter-spacing: .14em;
  color: var(--cv-cyan);
}

.page-about .ab-section .section-sub {
  max-width: 58ch;
  margin-top: .7rem;
  color: var(--cv-muted);
  line-height: 1.78;
}

.page-about .ab-section a {
  color: var(--cv-cyan);
  text-decoration-color: rgba(47, 212, 232, .45);
  text-underline-offset: 3px;
}

.page-about .ab-section a:hover,
.page-about .ab-section a:focus-visible {
  color: var(--cv-lime);
}

.page-about .ab-figure {
  margin-bottom: clamp(1.6rem, 4vw, 2.4rem);
}

/* ---------- 时间轴 ---------- */

.page-about .ab-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 1.9rem;
  list-style: none;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: .5rem;
  bottom: .8rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cv-cyan) 0%, var(--cv-violet) 62%, rgba(138, 92, 255, 0) 100%);
}

.page-about .ab-stage {
  position: relative;
  padding-bottom: 1.9rem;
}

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

.page-about .ab-stage::before {
  content: "";
  position: absolute;
  left: -1.9rem;
  top: .55rem;
  width: 13px;
  height: 13px;
  background: var(--cv-deep);
  border: 1px solid var(--cv-cyan);
  transform: rotate(45deg);
}

.page-about .ab-stage__year {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(1.9rem, 5.6vw, 2.7rem);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--cv-ink);
}

.page-about .ab-stage__body {
  margin-top: .55rem;
}

.page-about .ab-stage__title {
  margin: 0;
  font-size: 1.06rem;
  font-weight: 600;
  color: var(--cv-cyan);
}

.page-about .ab-stage__body p {
  margin: .5rem 0 0;
  color: var(--cv-muted);
  line-height: 1.8;
}

/* ---------- 团队 ---------- */

.page-about .ab-team {
  display: grid;
  gap: 1.5rem;
  margin-bottom: clamp(1.6rem, 4vw, 2.4rem);
}

.page-about .ab-team__note p {
  margin: 0 0 .9rem;
  color: var(--cv-muted);
  line-height: 1.8;
}

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

.page-about .ab-roles {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-role {
  position: relative;
  display: grid;
  gap: .3rem;
  padding: 1.2rem 1.25rem 1.5rem;
  background: var(--cv-panel);
  clip-path: var(--cut-poly);
  outline: none;
  transition: background .26s var(--ease), transform .26s var(--ease);
}

.page-about .ab-role::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--cv-cyan);
  transform: scaleY(.26);
  transform-origin: top;
  transition: transform .3s var(--ease), background .3s var(--ease);
}

.page-about .ab-role:hover,
.page-about .ab-role:focus-visible {
  background: var(--ab-hi);
  transform: translateY(-2px);
}

.page-about .ab-role:hover::after,
.page-about .ab-role:focus-visible::after {
  transform: scaleY(1);
  background: var(--cv-lime);
}

.page-about .ab-role__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.55rem;
  font-weight: 600;
  line-height: 1;
  color: var(--cv-cyan);
}

.page-about .ab-role__name {
  margin: .15rem 0 0;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--cv-ink);
}

.page-about .ab-role__duty {
  margin: .35rem 0 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--cv-muted);
  max-height: 4.6rem;
  opacity: .82;
  transition: opacity .26s var(--ease);
}

.page-about .ab-role:hover .ab-role__duty,
.page-about .ab-role:focus-visible .ab-role__duty {
  opacity: 1;
}

.page-about .ab-role__meter {
  position: absolute;
  left: 1.25rem;
  right: 1.25rem;
  bottom: .85rem;
  height: 3px;
  background: rgba(47, 212, 232, .18);
}

.page-about .ab-role__meter::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--ab-w, 40%);
  background: linear-gradient(90deg, var(--cv-cyan), var(--cv-violet));
}

.page-about .ab-role:nth-child(1) .ab-role__meter::after { width: 100%; }
.page-about .ab-role:nth-child(2) .ab-role__meter::after { width: 79%; }
.page-about .ab-role:nth-child(3) .ab-role__meter::after { width: 44%; }
.page-about .ab-role:nth-child(4) .ab-role__meter::after { width: 29%; }

/* ---------- 数据协作 ---------- */

.page-about .ab-notes {
  display: grid;
  gap: 1rem;
}

.page-about .ab-note {
  padding: 1.15rem 1.2rem 1.3rem;
  border-left: 2px solid var(--cv-violet);
  background: linear-gradient(90deg, rgba(138, 92, 255, .12), rgba(138, 92, 255, 0) 78%);
}

.page-about .ab-note__title {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--cv-ink);
}

.page-about .ab-note p {
  margin: .5rem 0 0;
  color: var(--cv-muted);
  line-height: 1.78;
}

/* ---------- 版本节奏 ---------- */

.page-about .ab-cadence {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--cv-grid);
  border: 1px solid var(--cv-grid);
}

.page-about .ab-cadence__item {
  padding: 1.2rem 1.25rem 1.35rem;
  background: var(--cv-night);
}

.page-about .ab-cadence__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--cv-violet);
}

.page-about .ab-cadence__name {
  margin: .45rem 0 0;
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--cv-ink);
}

.page-about .ab-cadence__item p:last-child {
  margin: .5rem 0 0;
  font-size: .94rem;
  line-height: 1.78;
  color: var(--cv-muted);
}

.page-about .ab-cadence__foot {
  margin: 1.1rem 0 0;
  font-size: .94rem;
  color: var(--cv-muted);
  line-height: 1.78;
}

/* ---------- 覆盖范围 ---------- */

.page-about .ab-reach {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-reach__item {
  padding: 1.15rem 1.2rem 1.3rem;
  background: var(--cv-panel);
  clip-path: var(--cut-poly);
}

.page-about .ab-reach__num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(2rem, 5.4vw, 2.7rem);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--cv-lime);
}

.page-about .ab-reach__label {
  margin: .5rem 0 0;
  font-size: .95rem;
  font-weight: 600;
  color: var(--cv-ink);
}

.page-about .ab-reach__desc {
  margin: .35rem 0 0;
  font-size: .88rem;
  line-height: 1.72;
  color: var(--cv-muted);
}

.page-about .ab-reach__foot {
  margin: 1.2rem 0 0;
  font-size: .94rem;
  line-height: 1.8;
  color: var(--cv-muted);
}

/* ---------- 留下的理由 ---------- */

.page-about .ab-why p {
  margin: 0 0 .9rem;
  max-width: 62ch;
  color: var(--cv-muted);
  line-height: 1.82;
}

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

.page-about .ab-cta {
  margin-top: clamp(1.5rem, 4vw, 2.2rem);
  padding: 1.35rem 1.3rem 1.5rem;
  border: 1px solid var(--ab-panel-line);
  background:
    linear-gradient(120deg, rgba(47, 212, 232, .14), rgba(138, 92, 255, .12) 62%, transparent 100%),
    var(--cv-night);
  clip-path: var(--cut-poly);
}

.page-about .ab-cta__text {
  margin: 0;
  font-size: 1.02rem;
  color: var(--cv-ink);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.1rem;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .ab-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .ab-reach {
    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);
    gap: clamp(2rem, 5vw, 4.5rem);
    align-items: end;
  }

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

  .page-about .ab-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: clamp(1.5rem, 3.5vw, 2.6rem);
    align-items: center;
  }

  .page-about .ab-timeline {
    padding-left: 2.6rem;
  }

  .page-about .ab-stage {
    display: grid;
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 1.4rem;
    align-items: start;
  }

  .page-about .ab-stage::before {
    left: -2.6rem;
  }

  .page-about .ab-stage__body {
    margin-top: .35rem;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.4rem);
    align-items: start;
  }

  .page-about .ab-toc {
    top: calc(var(--topbar-h) + 1.5rem);
    background: none;
    padding: 0;
  }

  .page-about .ab-toc__list {
    display: block;
    overflow: visible;
    padding: 0;
  }

  .page-about .ab-toc__list li + li {
    margin-top: .35rem;
  }

  .page-about .ab-toc__link {
    width: 100%;
    justify-content: flex-start;
    clip-path: none;
    background: none;
    border: 0;
    border-left: 2px solid var(--cv-grid);
    padding: .45rem .6rem;
    white-space: normal;
  }

  .page-about .ab-toc__link:hover,
  .page-about .ab-toc__link:focus-visible,
  .page-about .ab-toc__link.is-current {
    background: rgba(47, 212, 232, .08);
    border-left-color: var(--cv-cyan);
  }

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

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

  .page-about .ab-section {
    scroll-margin-top: calc(var(--topbar-h) + 2rem);
  }
}

@media (min-width: 1280px) {
  .page-about .ab-layout {
    grid-template-columns: 236px minmax(0, 1fr);
  }
}
<<<END>>>

.page-about {
  --ab-w: 1rem;
}