.page-about {
  --ab-rail: 4.5rem;
  --ab-gap: clamp(1.5rem, 4vw, 3.5rem);
  --ab-ink-soft: rgba(16, 32, 46, .8);
  background: var(--yd-porcelain);
  color: var(--yd-ink);
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  padding-block: .75rem .25rem;
}

/* ---------- 封面 ---------- */
.page-about .ab-cover {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding-block: clamp(2.2rem, 5.5vw, 4.2rem) clamp(2.2rem, 5vw, 3.6rem);
  background:
    radial-gradient(120% 150% at 6% -10%, rgba(46, 107, 138, .9), transparent 56%),
    linear-gradient(158deg, var(--yd-navy-2) 0%, var(--yd-navy) 44%, var(--yd-navy-3) 100%);
  color: var(--yd-porcelain);
}

.page-about .ab-cover__cloud {
  position: absolute;
  inset: -18% -12% auto -12%;
  height: 130%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58% 52% at 18% 24%, rgba(201, 169, 110, .3), transparent 62%),
    radial-gradient(52% 48% at 84% 8%, rgba(169, 198, 214, .34), transparent 60%);
  animation: ab-breathe 12s var(--yd-ease) infinite;
}

@keyframes ab-breathe {
  0%, 100% { transform: translate3d(0, 0, 0); }
  50% { transform: translate3d(0, -8px, 0); }
}

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

.page-about .ab-cover__label {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  margin: 0 0 1rem;
  font-size: .74rem;
  letter-spacing: .22em;
  color: var(--yd-gold);
}

.page-about .ab-cover__label::before {
  content: "";
  width: 1.75rem;
  height: 1px;
  background: var(--yd-gold);
}

.page-about .ab-cover__title {
  margin: 0 0 1rem;
  font-family: var(--yd-font-display);
  font-weight: 900;
  font-size: clamp(1.75rem, 4.6vw, 2.9rem);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--yd-porcelain);
}

.page-about .ab-cover__lead {
  margin: 0;
  max-width: 40rem;
  font-size: clamp(.95rem, 1.8vw, 1.06rem);
  line-height: 1.85;
  color: rgba(247, 244, 239, .84);
}

.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(247, 244, 239, .16);
  border: 1px solid rgba(247, 244, 239, .16);
  border-radius: var(--yd-r-md);
  overflow: hidden;
}

.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  padding: 1rem 1rem 1.1rem;
  background: rgba(7, 27, 49, .58);
}

.page-about .ab-fact__line {
  display: flex;
  align-items: baseline;
  gap: .25rem;
  margin: 0;
}

.page-about .ab-fact__num {
  font-family: var(--yd-font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.3rem, 2.6vw, 1.7rem);
  line-height: 1.1;
  color: var(--yd-gold);
}

.page-about .ab-fact__unit {
  font-size: .8rem;
  color: rgba(247, 244, 239, .75);
}

.page-about .ab-fact__k {
  margin: .45rem 0 0;
  font-size: .76rem;
  letter-spacing: .06em;
  color: rgba(247, 244, 239, .72);
}

/* ---------- 横向索引带 ---------- */
.page-about .ab-index {
  background: var(--yd-porcelain);
  border-bottom: var(--yd-line);
}

.page-about .ab-index__inner {
  padding-block: .7rem;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .ab-index__list {
  display: flex;
  align-items: center;
  gap: .2rem;
  margin: 0;
  padding: 0;
  list-style: none;
  min-width: max-content;
}

.page-about .ab-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: .45rem;
  padding: .5rem .75rem;
  border-radius: var(--yd-r-sm);
  font-size: .86rem;
  color: var(--yd-navy);
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--yd-t-fast) var(--yd-ease), color var(--yd-t-fast) var(--yd-ease);
}

.page-about .ab-index__link .yd-num {
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--yd-blue);
}

.page-about .ab-index__link:hover {
  background: rgba(169, 198, 214, .3);
}

.page-about .ab-index__link:focus-visible {
  outline: 2px solid var(--yd-gold);
  outline-offset: 2px;
}

/* ---------- 通用双栏骨架 ---------- */
.page-about .ab-stage {
  padding-block: clamp(2.4rem, 6vw, 4.6rem);
  border-bottom: var(--yd-line-soft);
}

.page-about .ab-stage__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}

.page-about .ab-stage__side {
  display: flex;
  align-items: baseline;
  gap: .85rem;
}

.page-about .ab-stage__no {
  margin: 0;
  font-family: var(--yd-font-data);
  font-variant-numeric: tabular-nums;
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .06em;
  color: var(--yd-gold);
}

.page-about .ab-stage__tag {
  margin: 0;
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--yd-blue);
}

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

.page-about .ab-h2 {
  margin: 0 0 .75rem;
  font-family: var(--yd-font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.4vw, 2.15rem);
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--yd-navy);
}

.page-about .ab-lead {
  margin: 0 0 1.9rem;
  max-width: 42rem;
  font-size: clamp(.95rem, 1.7vw, 1.02rem);
  line-height: 1.85;
  color: var(--ab-ink-soft);
}

.page-about .ab-body p {
  margin: 0 0 1rem;
  max-width: 40rem;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--ab-ink-soft);
}

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

.page-about .ab-body--after {
  margin: 1.6rem 0 0;
  max-width: 42rem;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--ab-ink-soft);
}

.page-about .ab-stat {
  padding-left: .85rem;
  border-left: 3px solid var(--yd-gold);
  font-family: var(--yd-font-display);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--yd-navy) !important;
}

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

.page-about .ab-tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  column-gap: 1rem;
  padding-bottom: 2.1rem;
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: 1.3rem;
  top: 2.9rem;
  bottom: .2rem;
  border-left: 1px dashed rgba(46, 107, 138, .45);
}

.page-about .ab-tl__item:last-child::before {
  content: none;
}

.page-about .ab-tl__mark > span {
  display: grid;
  place-items: center;
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 50%;
  background: var(--yd-gold);
  color: var(--yd-navy-2);
  font-family: var(--yd-font-data);
  font-variant-numeric: tabular-nums;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .04em;
  box-shadow: 0 0 0 5px rgba(201, 169, 110, .16);
}

.page-about .ab-tl__body {
  min-width: 0;
  padding-top: .05rem;
}

.page-about .ab-tl__era {
  margin: 0 0 .32rem;
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--yd-blue);
}

.page-about .ab-tl__title {
  margin: 0 0 .5rem;
  font-family: var(--yd-font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.1vw, 1.28rem);
  line-height: 1.42;
  color: var(--yd-navy);
}

.page-about .ab-tl__text {
  margin: 0;
  max-width: 38rem;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--ab-ink-soft);
}

.page-about .ab-tl__figure {
  margin: 1.1rem 0 0;
}

.page-about .yd-figure__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--yd-r-md);
}

.page-about .yd-figure__cap {
  margin-top: .55rem;
  font-size: .78rem;
  line-height: 1.7;
  letter-spacing: .02em;
  color: rgba(16, 32, 46, .58);
}

/* ---------- 覆盖示意 ---------- */
.page-about .ab-net {
  display: grid;
  gap: 1.75rem;
}

.page-about .ab-net__map {
  position: relative;
  min-height: 16rem;
  padding: 1.5rem;
  border-radius: 42% 58% 46% 54% / 48% 44% 56% 52%;
  border: 1px solid rgba(46, 107, 138, .2);
  background: radial-gradient(120% 110% at 26% 18%, rgba(169, 198, 214, .88), rgba(169, 198, 214, .34) 58%, rgba(169, 198, 214, .08) 100%);
}

.page-about .ab-net__nodes {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-node {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .18rem;
  transform: translate(-50%, -50%);
  text-align: center;
}

.page-about .ab-node--jj { left: 38%; top: 22%; }
.page-about .ab-node--nc { left: 48%; top: 48%; }
.page-about .ab-node--gz { left: 56%; top: 76%; }

.page-about .ab-node__dot {
  width: .8rem;
  height: .8rem;
  border-radius: 50%;
  background: var(--yd-gold);
  box-shadow: 0 0 0 4px rgba(201, 169, 110, .24);
  transition: transform var(--yd-t-fast) var(--yd-ease);
}

.page-about .ab-node:hover .ab-node__dot,
.page-about .ab-node:focus-within .ab-node__dot {
  transform: scale(1.15);
}

.page-about .ab-node__name {
  font-size: .82rem;
  font-weight: 700;
  color: var(--yd-navy);
}

.page-about .ab-node__tip {
  padding: .08rem .45rem;
  border-radius: 999px;
  background: rgba(247, 244, 239, .88);
  font-family: var(--yd-font-data);
  font-variant-numeric: tabular-nums;
  font-size: .66rem;
  color: var(--yd-blue);
  white-space: nowrap;
}

.page-about .ab-net__caption {
  position: absolute;
  left: 50%;
  bottom: 1.05rem;
  transform: translateX(-50%);
  margin: 0;
  max-width: 88%;
  padding: .25rem .75rem;
  border-radius: 999px;
  background: rgba(247, 244, 239, .84);
  font-size: .72rem;
  letter-spacing: .05em;
  text-align: center;
  color: var(--yd-blue);
}

.page-about .ab-net__kv {
  align-self: center;
}

.page-about .ab-net__photo {
  margin: 2rem 0 0;
}

.page-about .ab-net__photo .yd-figure__img {
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

/* ---------- 准入路线 ---------- */
.page-about .ab-route {
  display: grid;
  gap: 1.7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-route__step {
  position: relative;
  padding-top: 1.9rem;
}

.page-about .ab-route__dot {
  position: absolute;
  top: .35rem;
  left: 0;
  width: .8rem;
  height: .8rem;
  border-radius: 50%;
  background: var(--yd-gold);
  box-shadow: 0 0 0 4px rgba(201, 169, 110, .18);
}

.page-about .ab-route__no {
  margin: 0 0 .3rem;
  font-family: var(--yd-font-data);
  font-variant-numeric: tabular-nums;
  font-size: .7rem;
  letter-spacing: .14em;
  color: var(--yd-blue);
}

.page-about .ab-route__title {
  margin: 0 0 .45rem;
  font-family: var(--yd-font-display);
  font-weight: 700;
  font-size: 1.06rem;
  line-height: 1.45;
  color: var(--yd-navy);
}

.page-about .ab-route__text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--ab-ink-soft);
}

.page-about .ab-note {
  margin-top: 1.8rem;
  padding: 1.1rem 1.2rem;
  border-left: 3px solid var(--yd-gold);
  border-radius: 0 var(--yd-r-md) var(--yd-r-md) 0;
  background: var(--yd-gold-2);
}

.page-about .ab-note p {
  margin: 0;
  max-width: 42rem;
  font-size: .93rem;
  line-height: 1.85;
  color: rgba(16, 32, 46, .86);
}

/* ---------- 培训图文 ---------- */
.page-about .ab-split {
  display: grid;
  gap: 1.75rem;
}

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

/* ---------- 质量指标 ---------- */
.page-about .ab-metrics {
  display: grid;
  gap: 1px;
  background: rgba(11, 42, 74, .13);
  border-radius: var(--yd-r-md);
  overflow: hidden;
}

.page-about .ab-metric {
  padding: 1.15rem 1.2rem 1.3rem;
  background: var(--yd-porcelain);
}

.page-about .ab-metric__k {
  margin: 0 0 .55rem;
  font-size: .95rem;
  font-weight: 700;
  color: var(--yd-navy);
}

.page-about .ab-metric__k::before {
  content: "";
  display: block;
  width: 1.6rem;
  height: 2px;
  margin-bottom: .6rem;
  background: var(--yd-gold);
}

.page-about .ab-metric__t {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--ab-ink-soft);
}

/* ---------- 长期伙伴 ---------- */
.page-about .ab-partners {
  display: grid;
  gap: 1.5rem;
}

.page-about .ab-partner {
  padding-top: 1.1rem;
  border-top: 2px solid rgba(46, 107, 138, .28);
}

.page-about .ab-partner__title {
  margin: 0 0 .4rem;
  font-family: var(--yd-font-display);
  font-weight: 700;
  font-size: 1.06rem;
  line-height: 1.45;
  color: var(--yd-navy);
}

.page-about .ab-partner__num {
  margin: 0 0 .55rem;
  font-family: var(--yd-font-data);
  font-variant-numeric: tabular-nums;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--yd-gold);
}

.page-about .ab-partner__num .yd-num {
  font-size: inherit;
  color: inherit;
}

.page-about .ab-partner__text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--ab-ink-soft);
}

.page-about .ab-totop {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  margin-top: 2rem;
  padding-bottom: .15rem;
  border-bottom: 1px dashed rgba(46, 107, 138, .5);
  font-size: .84rem;
  color: var(--yd-blue);
  text-decoration: none;
}

.page-about .ab-totop:focus-visible {
  outline: 2px solid var(--yd-gold);
  outline-offset: 3px;
}

/* ---------- 结尾转化 ---------- */
.page-about .ab-cta {
  padding-block: clamp(2.4rem, 5vw, 3.8rem);
  background:
    radial-gradient(110% 130% at 88% 0%, rgba(46, 107, 138, .85), transparent 58%),
    linear-gradient(150deg, var(--yd-navy-2) 0%, var(--yd-navy) 58%, var(--yd-navy-3) 100%);
  color: var(--yd-porcelain);
}

.page-about .ab-cta__title {
  margin: 0 0 .8rem;
  font-family: var(--yd-font-display);
  font-weight: 900;
  font-size: clamp(1.3rem, 3vw, 1.85rem);
  line-height: 1.32;
  color: var(--yd-porcelain);
}

.page-about .ab-cta__text {
  margin: 0 0 1.6rem;
  max-width: 42rem;
  font-size: .95rem;
  line-height: 1.85;
  color: rgba(247, 244, 239, .82);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .ab-cta .yd-btn--ghost {
  color: var(--yd-porcelain);
  border-color: rgba(247, 244, 239, .45);
  background: transparent;
}

.page-about .ab-cta .yd-btn--ghost:hover {
  background: rgba(247, 244, 239, .14);
}

/* ---------- 响应式 ---------- */
@media (min-width: 48rem) {
  .page-about .ab-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.9rem;
  }

  .page-about .ab-index__list {
    flex-wrap: wrap;
    min-width: 0;
    justify-content: flex-start;
  }

  .page-about .ab-index__inner {
    overflow-x: visible;
  }
}

@media (min-width: 52rem) {
  .page-about .ab-route {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.75rem;
  }

  .page-about .ab-route__step::before {
    content: "";
    position: absolute;
    top: .62rem;
    left: 1.2rem;
    right: -1.4rem;
    border-top: 1px dashed rgba(46, 107, 138, .4);
  }

  .page-about .ab-route__step:last-child::before {
    content: none;
  }
}

@media (min-width: 54rem) {
  .page-about .ab-net {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
    align-items: center;
    gap: clamp(1.75rem, 4vw, 3rem);
  }

  .page-about .ab-net__map {
    min-height: 18.5rem;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
    gap: clamp(1.75rem, 4vw, 3rem);
  }

  .page-about .ab-cta__inner {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: end;
    column-gap: 3rem;
  }

  .page-about .ab-cta__title,
  .page-about .ab-cta__text {
    grid-column: 1;
  }

  .page-about .ab-cta__actions {
    grid-column: 2;
    grid-row: 1 / span 2;
    justify-content: flex-end;
  }
}

@media (min-width: 56rem) {
  .page-about .ab-stage__grid {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    column-gap: var(--ab-gap);
  }

  .page-about .ab-stage__side {
    position: sticky;
    top: 6.5rem;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: .55rem;
  }

  .page-about .ab-stage__side::after {
    content: "";
    width: 2px;
    height: 3.2rem;
    margin-top: .4rem;
    border-radius: 2px;
    background: linear-gradient(180deg, var(--yd-gold), rgba(201, 169, 110, 0));
  }
}

@media (min-width: 62rem) {
  .page-about .ab-cover__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: end;
    column-gap: clamp(2rem, 5vw, 4rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-cover__cloud {
    animation: none;
  }

  .page-about .ab-node__dot {
    transition: none;
  }

  .page-about .ab-index__link {
    transition: none;
  }
}
<<<END>>>