.page-about {
  --about-gap: clamp(20px, 4vw, 44px);
  --about-side: 190px;
  background: var(--ys-ink-900);
  color: var(--ys-cream);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--ys-header-h) + 44px) var(--ys-gutter) clamp(36px, 6vw, 60px);
  background:
    radial-gradient(760px 460px at 92% -8%, rgba(57, 242, 224, .18), transparent 64%),
    radial-gradient(620px 420px at -10% 108%, rgba(255, 107, 53, .16), transparent 62%),
    linear-gradient(180deg, var(--ys-ink-900), var(--ys-ink-800));
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -22%;
  right: -14%;
  width: min(540px, 74vw);
  height: min(540px, 74vw);
  border-radius: 42% 58% 55% 45% / 48% 42% 58% 52%;
  background: linear-gradient(135deg, rgba(57, 242, 224, .2), rgba(57, 242, 224, 0) 68%);
  filter: blur(6px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 52px);
  align-items: center;
  max-width: var(--ys-max);
  margin-inline: auto;
}

.page-about .about-hero__title {
  margin: 14px 0 18px;
  font-size: clamp(2.4rem, 8.4vw, 4.5rem);
  font-weight: 900;
  line-height: 1.03;
  letter-spacing: -.02em;
}

.page-about .about-hero__mark {
  color: var(--ys-cyan);
  background: linear-gradient(180deg, transparent 64%, rgba(255, 107, 53, .32) 64%, rgba(255, 107, 53, .32) 94%, transparent 94%);
}

.page-about .about-hero__copy .ys-lede {
  max-width: 58ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

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

.page-about .about-hero__figure .ys-media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: var(--ys-radius-xl);
  border: 1px solid var(--ys-line-strong);
  box-shadow: 0 24px 60px rgba(6, 16, 31, .7);
}

.page-about .about-hero__figure .ys-figure__caption {
  margin-top: 12px;
  font-size: .82rem;
  letter-spacing: .04em;
  color: var(--ys-mist);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 12px clamp(14px, 3vw, 28px);
  max-width: var(--ys-max);
  margin: clamp(30px, 5vw, 52px) auto 0;
  padding: 18px clamp(16px, 3vw, 26px);
  border-radius: var(--ys-radius-lg);
  border: 1px solid var(--ys-line);
  background: var(--ys-glass);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-stat dt {
  font-size: .74rem;
  letter-spacing: .18em;
  color: var(--ys-mist);
}

.page-about .about-stat dd {
  margin: 0;
  font-size: .95rem;
  color: var(--ys-cream);
}

.page-about .about-stat dd .ys-mono {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--ys-cyan);
  margin-right: 4px;
}

/* ---------- 主体栅格 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
  padding-block: clamp(40px, 7vw, 84px);
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--ys-mist);
}

.page-about .about-index .ys-index__link {
  display: block;
  padding: 8px 14px;
  border-radius: var(--ys-radius-pill);
  font-size: .88rem;
  color: var(--ys-mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ys-ease), background .2s var(--ys-ease);
}

.page-about .about-index .ys-index__link:hover,
.page-about .about-index .ys-index__link:focus-visible {
  color: var(--ys-cyan);
  background: rgba(57, 242, 224, .1);
}

.page-about .about-index .ys-index__link[aria-current="true"] {
  color: var(--ys-ink-900);
  background: var(--ys-cyan);
  font-weight: 700;
}

.page-about .about-body {
  display: flex;
  flex-direction: column;
  gap: clamp(44px, 8vw, 88px);
  min-width: 0;
}

.page-about .about-section {
  position: relative;
  scroll-margin-top: calc(var(--ys-header-h) + 24px);
}

.page-about .about-secnum {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px;
  font-size: .8rem;
  letter-spacing: .2em;
  color: var(--ys-orange);
}

.page-about .about-secnum::after {
  content: "";
  width: 46px;
  height: 1px;
  background: linear-gradient(90deg, var(--ys-orange), transparent);
}

.page-about .about-section .ys-h2 {
  margin: 0 0 16px;
}

.page-about .about-section .ys-body {
  max-width: 64ch;
  color: var(--ys-mist);
}

.page-about .about-section .ys-body + .ys-body {
  margin-top: 14px;
}

.page-about .about-quote {
  margin: 26px 0 0;
  padding: 20px 22px;
  border-left: 3px solid var(--ys-cyan);
  border-radius: 0 var(--ys-radius-md) var(--ys-radius-md) 0;
  background: linear-gradient(120deg, rgba(57, 242, 224, .1), rgba(16, 42, 74, .55));
  color: var(--ys-cream);
  font-size: 1rem;
  line-height: 1.75;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__figure {
  margin: 26px 0 8px;
}

.page-about .about-timeline__figure .ys-media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  border-radius: var(--ys-radius-xl);
  border: 1px solid var(--ys-line);
  background: linear-gradient(140deg, var(--ys-ink-700), var(--ys-ink-900));
}

.page-about .about-timeline__figure .ys-figure__caption {
  margin-top: 10px;
  font-size: .8rem;
  color: var(--ys-mist);
}

.page-about .about-timeline {
  margin-top: 26px;
}

.page-about .about-timeline__track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(238px, 80%);
  gap: 14px;
  overflow-x: auto;
  padding: 4px 4px 16px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-node {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 20px 24px;
  border-radius: var(--ys-radius-lg);
  border: 1px solid var(--ys-line);
  background: linear-gradient(160deg, rgba(16, 42, 74, .92), rgba(10, 27, 49, .92));
  scroll-snap-align: start;
  transition: transform .3s var(--ys-ease), border-color .3s var(--ys-ease);
}

.page-about .about-node:hover {
  transform: translateY(-2px);
  border-color: var(--ys-line-strong);
}

.page-about .about-node__dot {
  display: flex;
  align-items: center;
  width: 100%;
  height: 12px;
  margin-bottom: 6px;
}

.page-about .about-node__dot::before {
  content: "";
  flex: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ys-orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, .18);
}

.page-about .about-node__dot::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(57, 242, 224, .5), rgba(57, 242, 224, 0));
}

.page-about .about-node__year {
  margin: 0;
  font-size: clamp(1.6rem, 5vw, 2rem);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--ys-cyan);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.page-about .about-node .ys-h3 {
  margin: 0;
  font-size: 1.04rem;
  color: var(--ys-cream);
}

.page-about .about-node .ys-body {
  margin: 0;
  font-size: .92rem;
  line-height: 1.7;
  color: var(--ys-mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team__split {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin: 24px 0;
}

.page-about .about-team__item {
  padding: 18px 16px;
  border-radius: var(--ys-radius-md);
  border: 1px solid var(--ys-line);
  background: var(--ys-ink-800);
  transition: border-color .25s var(--ys-ease), transform .25s var(--ys-ease);
}

.page-about .about-team__item:hover {
  border-color: var(--ys-line-strong);
  transform: translateY(-2px);
}

.page-about .about-team__num {
  margin: 0;
  font-family: var(--ys-font-mono);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--ys-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__label {
  margin: 10px 0 0;
  font-size: .88rem;
  line-height: 1.65;
  color: var(--ys-mist);
}

.page-about .about-flow {
  list-style: none;
  counter-reset: flow;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-flow li {
  counter-increment: flow;
  position: relative;
  padding: 15px 18px 15px 56px;
  border-radius: var(--ys-radius-md);
  border: 1px solid var(--ys-line);
  background: rgba(16, 42, 74, .5);
  font-size: .92rem;
  line-height: 1.7;
  color: var(--ys-mist);
}

.page-about .about-flow li::before {
  content: counter(flow, decimal-leading-zero);
  position: absolute;
  left: 18px;
  top: 16px;
  font-family: var(--ys-font-mono);
  font-size: .82rem;
  letter-spacing: .08em;
  color: var(--ys-orange);
}

/* ---------- 覆盖与协作 ---------- */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin: 24px 0;
}

.page-about .about-metric {
  padding: 20px 18px 22px;
  border-radius: var(--ys-radius-lg);
  border: 1px solid var(--ys-line);
  background: linear-gradient(150deg, rgba(16, 42, 74, .95), rgba(10, 27, 49, .85));
  transition: transform .25s var(--ys-ease), border-color .25s var(--ys-ease);
}

.page-about .about-metric:hover {
  transform: translateY(-2px);
  border-color: var(--ys-line-strong);
}

.page-about .about-metric__num {
  margin: 0;
  font-family: var(--ys-font-mono);
  font-size: clamp(1.7rem, 4.6vw, 2.2rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--ys-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-metric__unit {
  margin-left: 6px;
  font-family: var(--ys-font-sans);
  font-size: .76rem;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--ys-orange-soft);
}

.page-about .about-metric__label {
  margin: 10px 0 0;
  font-size: .88rem;
  line-height: 1.65;
  color: var(--ys-mist);
}

.page-about .about-partners {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-partners__item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  border-top: 1px solid var(--ys-line);
  font-size: .94rem;
  line-height: 1.7;
  color: var(--ys-mist);
}

.page-about .about-partners__num {
  flex: none;
  min-width: 46px;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--ys-orange);
  font-variant-numeric: tabular-nums;
}

/* ---------- 价值主张 ---------- */
.page-about .about-values {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-value {
  position: relative;
  overflow: hidden;
  padding: 24px 22px 26px;
  border-radius: var(--ys-radius-lg);
  border: 1px solid var(--ys-line);
  background: linear-gradient(180deg, rgba(16, 42, 74, .92), rgba(6, 16, 31, .92));
}

.page-about .about-value::after {
  content: "";
  position: absolute;
  right: -34px;
  bottom: -52px;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(57, 242, 224, .22), transparent 70%);
  pointer-events: none;
}

.page-about .about-value__key {
  margin: 0;
  font-family: var(--ys-font-mono);
  font-size: .74rem;
  letter-spacing: .22em;
  color: var(--ys-orange);
}

.page-about .about-value .ys-h3 {
  margin: 10px 0 10px;
  font-size: 1.22rem;
}

.page-about .about-value .ys-body {
  margin: 0;
  font-size: .92rem;
  line-height: 1.72;
  color: var(--ys-mist);
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: 340px;
  margin-top: clamp(48px, 8vw, 96px);
  overflow: hidden;
  border-top: 1px solid var(--ys-line);
}

.page-about .about-close__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-close::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    radial-gradient(620px 320px at 82% 6%, rgba(57, 242, 224, .18), transparent 66%),
    linear-gradient(180deg, rgba(6, 16, 31, .55), rgba(6, 16, 31, .95) 78%);
}

.page-about .about-close__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--ys-max);
  margin-inline: auto;
  padding: clamp(36px, 7vw, 80px) var(--ys-gutter) clamp(34px, 6vw, 58px);
}

.page-about .about-close__inner .ys-h2 {
  margin: 0 0 14px;
}

.page-about .about-close__inner .ys-body {
  max-width: 62ch;
  color: var(--ys-mist);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 979px) {
  .page-about .about-index .ys-index__list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: none;
  }

  .page-about .about-index .ys-index__list::-webkit-scrollbar {
    display: none;
  }

  .page-about .about-index .ys-index__item {
    flex: none;
  }

  .page-about .about-index .ys-index__link {
    border: 1px solid var(--ys-line);
  }
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
  }

  .page-about .about-hero__figure {
    transform: translateY(6px);
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-side) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 68px);
  }

  .page-about .about-aside {
    position: sticky;
    top: calc(var(--ys-header-h) + 28px);
  }

  .page-about .about-index .ys-index__item + .ys-index__item {
    margin-top: 4px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-timeline__track {
    grid-auto-flow: row;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    grid-auto-columns: auto;
    overflow: visible;
    padding: 4px 0 0;
  }

  .page-about .about-node {
    padding: 22px 18px 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-metric,
  .page-about .about-team__item {
    transition: none;
  }

  .page-about .about-node:hover,
  .page-about .about-metric:hover,
  .page-about .about-team__item:hover {
    transform: none;
  }
}
<<<END>>>