.page-about {
  --ab-shell-gap: clamp(2rem, 4vw, 4.5rem);
  --ab-sec-pad: clamp(2.75rem, 6vw, 5.5rem);
  background: var(--xy-ink);
  color: var(--xy-white);
  font-family: var(--xy-font-body);
  line-height: 1.75;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-top: calc(var(--xy-header-h) + clamp(2.5rem, 6vw, 5rem));
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
  border-bottom: 1px solid var(--xy-line);
}

.page-about .ab-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .ab-hero__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}

.page-about .ab-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 10% 6%, rgba(59, 240, 208, 0.16), transparent 58%),
    radial-gradient(95% 80% at 92% 0%, rgba(255, 79, 163, 0.14), transparent 60%),
    linear-gradient(180deg, rgba(7, 10, 24, 0.5) 0%, rgba(7, 10, 24, 0.88) 62%, var(--xy-ink) 100%);
}

.page-about .ab-hero__inner {
  max-width: var(--xy-max);
  margin-inline: auto;
  padding-inline: var(--xy-pad);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .ab-hero__title {
  font-family: var(--xy-font-display);
  font-size: clamp(2rem, 5.2vw, 3.6rem);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: 0.03em;
  margin: 0.7rem 0 1.2rem;
  max-width: 22ch;
  text-shadow: 0 0 48px rgba(59, 240, 208, 0.2);
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(1rem, 1.4vw, 1.0625rem);
  color: var(--xy-dust);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .ab-board {
  padding: clamp(1.1rem, 2.4vw, 1.6rem);
  border: 1px solid var(--xy-line-strong);
  background: linear-gradient(155deg, rgba(27, 34, 71, 0.92), rgba(17, 22, 51, 0.78));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .ab-board__label {
  margin: 0 0 1rem;
  font-family: var(--xy-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--xy-cyan);
}

.page-about .ab-board__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .ab-board__item {
  display: grid;
  gap: 0.15rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px dashed var(--xy-line);
}

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

.page-about .ab-board__num {
  font-family: var(--xy-font-mono);
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--xy-white);
}

.page-about .ab-board__unit {
  margin-left: 0.25rem;
  font-size: 0.8rem;
  color: var(--xy-cyan);
}

.page-about .ab-board__desc {
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--xy-dust);
}

/* ---------- 页体骨架 ---------- */
.page-about .ab-shell {
  max-width: var(--xy-max);
  margin-inline: auto;
  padding-inline: var(--xy-pad);
  padding-block: clamp(2rem, 5vw, 4rem);
}

/* ---------- 轨道索引 ---------- */
.page-about .ab-rail {
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .ab-rail__label {
  margin: 0 0 0.75rem 0.4rem;
  font-family: var(--xy-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--xy-dust);
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0.35rem;
  display: flex;
  gap: 0.35rem;
  overflow-x: auto;
  border-bottom: 1px solid var(--xy-line);
  scrollbar-width: thin;
}

.page-about .ab-rail__link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.7rem;
  font-size: 0.8125rem;
  color: var(--xy-dust);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s ease, background-color 0.18s ease;
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--xy-white);
  background: rgba(59, 240, 208, 0.08);
}

.page-about .ab-rail__link[aria-current="true"] {
  color: var(--xy-cyan);
  background: rgba(59, 240, 208, 0.1);
}

.page-about .ab-rail__num {
  font-family: var(--xy-font-mono);
  font-size: 0.6875rem;
  color: var(--xy-cyan);
  opacity: 0.75;
}

/* ---------- 章节 ---------- */
.page-about .ab-sec {
  position: relative;
  padding-block: var(--ab-sec-pad);
  border-top: 1px solid var(--xy-line);
  scroll-margin-top: calc(var(--xy-header-h) + 1.5rem);
}

.page-about .ab-sec:first-of-type {
  padding-top: 0;
  border-top: 0;
}

.page-about .ab-sec__head {
  max-width: 66ch;
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .ab-sec__title {
  font-family: var(--xy-font-display);
  font-size: clamp(1.45rem, 2.7vw, 2.1rem);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: 0.03em;
  margin: 0.6rem 0 0.85rem;
}

.page-about .ab-sec__lede {
  margin: 0;
  color: var(--xy-dust);
}

.page-about .ab-p {
  max-width: 66ch;
  margin: 0 0 1rem;
  color: var(--xy-dust);
}

.page-about .ab-p strong {
  color: var(--xy-white);
  font-weight: 600;
}

.page-about .ab-p--after {
  margin-top: clamp(1.25rem, 2.5vw, 1.75rem);
}

.page-about .ab-sub {
  font-family: var(--xy-font-display);
  font-size: 1.0625rem;
  letter-spacing: 0.04em;
  margin: clamp(1.75rem, 3.5vw, 2.5rem) 0 1rem;
  color: var(--xy-white);
}

.page-about .ab-anno {
  display: none;
}

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

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--xy-line);
}

/* ---------- 轨道历程 ---------- */
.page-about .ab-orbit {
  margin: 0 0 clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .ab-orbit svg {
  display: block;
  width: 100%;
  height: clamp(80px, 13vw, 160px);
}

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

.page-about .ab-tl {
  padding: 1.1rem 1.2rem 1.25rem;
  border-left: 2px solid var(--xy-violet);
  background: linear-gradient(175deg, rgba(17, 22, 51, 0.92), rgba(17, 22, 51, 0.35));
}

.page-about .ab-tl:nth-child(2) {
  border-left-color: var(--xy-cyan);
}

.page-about .ab-tl:nth-child(3) {
  border-left-color: var(--xy-magenta);
}

.page-about .ab-tl:nth-child(4) {
  border-left-color: var(--xy-gold);
}

.page-about .ab-tl__year {
  font-family: var(--xy-font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.18em;
  color: var(--xy-gold);
}

.page-about .ab-tl__title {
  font-family: var(--xy-font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 0.45rem 0 0.5rem;
}

.page-about .ab-tl__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--xy-dust);
}

/* ---------- 规模数据墙 ---------- */
.page-about .ab-stats {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
}

.page-about .ab-stat {
  padding: 1.15rem 1.2rem 1.25rem;
  border: 1px solid var(--xy-line);
  background: linear-gradient(165deg, rgba(27, 34, 71, 0.85), rgba(17, 22, 51, 0.6));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--xy-font-mono);
  font-size: clamp(1.55rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--xy-cyan);
}

.page-about .ab-stat__suffix {
  font-size: 0.85rem;
  margin-left: 0.15rem;
  color: var(--xy-gold);
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--xy-dust);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.page-about .ab-compose {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.95rem;
}

.page-about .ab-compose__row {
  display: grid;
  gap: 0.4rem;
}

.page-about .ab-compose__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  font-size: 0.875rem;
}

.page-about .ab-compose__name {
  color: var(--xy-white);
}

.page-about .ab-compose__count {
  font-family: var(--xy-font-mono);
  font-size: 0.8125rem;
  color: var(--xy-cyan);
}

.page-about .ab-compose__track {
  display: block;
  height: 6px;
  background: rgba(168, 181, 214, 0.14);
  overflow: hidden;
}

.page-about .ab-compose__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--xy-cyan), var(--xy-violet));
}

.page-about .ab-compose__row:nth-child(1) .ab-compose__fill {
  width: 38%;
}

.page-about .ab-compose__row:nth-child(2) .ab-compose__fill {
  width: 19%;
  background: linear-gradient(90deg, var(--xy-violet), var(--xy-magenta));
}

.page-about .ab-compose__row:nth-child(3) .ab-compose__fill {
  width: 29%;
  background: linear-gradient(90deg, var(--xy-gold), var(--xy-cyan));
}

.page-about .ab-compose__row:nth-child(4) .ab-compose__fill {
  width: 14%;
  background: linear-gradient(90deg, var(--xy-green), var(--xy-cyan));
}

/* ---------- 生态 ---------- */
.page-about .ab-eco {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.page-about .ab-eco__nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .ab-node {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.85rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--xy-line);
  background: rgba(27, 34, 71, 0.55);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  transition: background-color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.page-about .ab-node:hover {
  background: rgba(27, 34, 71, 0.95);
  border-color: rgba(59, 240, 208, 0.45);
  transform: translateX(3px);
}

.page-about .ab-node__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--xy-cyan);
  box-shadow: 0 0 12px var(--xy-cyan);
}

.page-about .ab-node__name {
  font-size: 0.9375rem;
  color: var(--xy-white);
}

.page-about .ab-node__desc {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--xy-dust);
}

.page-about .ab-node__count {
  font-family: var(--xy-font-mono);
  font-size: 1.05rem;
  color: var(--xy-gold);
}

.page-about .ab-honors {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: clamp(1rem, 2.5vw, 1.5rem);
}

/* ---------- 反馈流程 ---------- */
.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  counter-reset: abflow;
}

.page-about .ab-flow__step {
  padding-top: 0.7rem;
  border-top: 1px solid var(--xy-line-strong);
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--xy-dust);
}

.page-about .ab-flow__step::before {
  counter-increment: abflow;
  content: "0" counter(abflow);
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--xy-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--xy-cyan);
}

.page-about .ab-flow__step strong {
  display: block;
  margin-bottom: 0.2rem;
  font-family: var(--xy-font-display);
  font-size: 0.9375rem;
  letter-spacing: 0.04em;
  color: var(--xy-white);
}

/* ---------- 为什么选择 ---------- */
.page-about .ab-why-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .ab-why-item {
  position: relative;
  padding: 0.9rem 1rem 0.95rem 2.2rem;
  border-left: 2px solid var(--xy-green);
  background: rgba(17, 22, 51, 0.65);
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--xy-dust);
}

.page-about .ab-why-item::before {
  content: "✓";
  position: absolute;
  left: 0.85rem;
  top: 0.88rem;
  color: var(--xy-green);
  font-weight: 700;
}

.page-about .ab-why-item strong {
  display: block;
  margin-bottom: 0.2rem;
  font-family: var(--xy-font-display);
  font-size: 0.9375rem;
  letter-spacing: 0.03em;
  color: var(--xy-white);
}

/* ---------- 行动区 ---------- */
.page-about .ab-cta {
  padding: clamp(1.6rem, 4vw, 2.75rem);
  border: 1px solid var(--xy-line-strong);
  background:
    radial-gradient(120% 140% at 8% 0%, rgba(59, 240, 208, 0.15), transparent 60%),
    radial-gradient(90% 120% at 96% 100%, rgba(255, 79, 163, 0.12), transparent 62%),
    linear-gradient(150deg, rgba(27, 34, 71, 0.92), rgba(7, 10, 24, 0.94));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

.page-about .ab-cta .ab-sec__title {
  margin-top: 0.6rem;
}

.page-about .ab-cta__text {
  margin: 0;
  max-width: 62ch;
  color: var(--xy-dust);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.page-about .ab-cta__links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin: 1.35rem 0 0;
  padding: 0;
  font-size: 0.875rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .ab-timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    align-items: start;
  }

  .page-about .ab-eco {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0.9rem;
  }
}

@media (min-width: 980px) {
  .page-about .ab-shell {
    display: grid;
    grid-template-columns: 190px minmax(0, 1fr);
    column-gap: var(--ab-shell-gap);
    align-items: start;
  }

  .page-about .ab-rail {
    position: sticky;
    top: calc(var(--xy-header-h) + 2rem);
    margin-bottom: 0;
    padding-right: 0.5rem;
  }

  .page-about .ab-rail__list {
    display: block;
    overflow: visible;
    padding: 0 0 0 0.1rem;
    border-bottom: 0;
    border-left: 1px solid var(--xy-line);
  }

  .page-about .ab-rail__link {
    margin-left: -1px;
    padding: 0.45rem 0.5rem 0.45rem 0.8rem;
    border-left: 2px solid transparent;
  }

  .page-about .ab-rail__link[aria-current="true"] {
    border-left-color: var(--xy-cyan);
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(250px, 0.68fr);
    align-items: end;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1280px) {
  .page-about .ab-content {
    padding-right: 2.5rem;
  }

  .page-about .ab-anno {
    display: block;
    position: absolute;
    top: 3.6rem;
    right: 0;
    writing-mode: vertical-rl;
    letter-spacing: 0.34em;
    font-family: var(--xy-font-mono);
    font-size: 0.625rem;
    text-transform: uppercase;
    color: rgba(168, 181, 214, 0.42);
    pointer-events: none;
  }
}

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

  .page-about .ab-node:hover {
    transform: none;
  }
}
<<<END>>>