.page-about {
  --ab-rail-top: 7.5rem;
  --ab-dash: repeating-linear-gradient(90deg, var(--line) 0 8px, transparent 8px 16px);
  background: var(--pitch-950);
  color: var(--chalk-50);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(1.4rem, 3.5vw, 2.4rem) 0 clamp(2.6rem, 6vw, 4.5rem);
  background:
    radial-gradient(110% 95% at 6% -12%, rgba(47, 243, 208, .17), transparent 62%),
    radial-gradient(70% 60% at 96% 4%, rgba(255, 138, 61, .13), transparent 60%),
    var(--pitch-950);
  border-bottom: var(--stroke) solid var(--line);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(1.4rem, 3.5vw, 2.6rem);
}

.page-about .ab-eyebrow {
  margin: 1rem 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan-400);
}

.page-about .ab-hero__title {
  margin: .6rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 6.4vw, 3.4rem);
  line-height: 1.16;
  letter-spacing: -.03em;
}

.page-about .ab-hero__title-mark {
  display: inline-block;
  margin-top: .35rem;
  padding: .04em .3em .08em;
  background: linear-gradient(104deg, var(--cyan-400) 0%, #7ff8e2 55%, var(--yellow-300) 100%);
  color: var(--pitch-950);
  transform: skewX(-6deg);
}

.page-about .ab-hero__lead {
  margin: 1.1rem 0 0;
  max-width: 46ch;
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.8;
  color: var(--mist-300);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.5rem;
}

/* 数字墙 */
.page-about .ab-figures {
  display: grid;
  align-self: end;
  border: var(--stroke) solid var(--line);
  background: var(--pitch-900);
  box-shadow: var(--hard-shadow-sm);
}

.page-about .ab-figure {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: .95rem 1.1rem;
  border-top: var(--stroke) solid var(--line);
}

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

.page-about .ab-figure__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.7rem, 5.2vw, 2.4rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--yellow-300);
}

.page-about .ab-figure__num small {
  margin-left: .35em;
  font-size: .46em;
  font-weight: 600;
  color: var(--chalk-50);
}

.page-about .ab-figure__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist-300);
}

/* ---------- 主体骨架 ---------- */
.page-about .ab-layout {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
  padding: clamp(2.2rem, 5vw, 4rem) 0 clamp(2.5rem, 6vw, 5rem);
}

/* ---------- 赛季／章节轨道 ---------- */
.page-about .ab-rail {
  position: relative;
}

.page-about .ab-rail__list {
  display: flex;
  gap: .5rem;
  margin: 0;
  padding: 0 0 .6rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .rail__item {
  flex: 0 0 auto;
}

.page-about .ab-rail__link {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  padding: .55rem .8rem;
  border: var(--stroke) solid var(--line);
  background: var(--pitch-900);
  color: var(--mist-300);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .ab-rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--line);
}

.page-about .ab-rail__text {
  font-size: .92rem;
  font-weight: 700;
}

.page-about .ab-rail__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--pitch-700);
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  border-color: var(--cyan-400);
  color: var(--chalk-50);
}

.page-about .rail__item.is-active .ab-rail__link {
  border-color: var(--cyan-400);
  background: var(--pitch-800);
  color: var(--chalk-50);
  box-shadow: var(--hard-shadow-sm);
}

.page-about .rail__item.is-active .ab-rail__num,
.page-about .rail__item.is-active .ab-rail__meta {
  color: var(--yellow-300);
}

/* ---------- 正文列 ---------- */
.page-about .ab-body {
  display: grid;
  gap: clamp(2.4rem, 6vw, 4.5rem);
  min-width: 0;
}

.page-about .ab-section {
  scroll-margin-top: var(--ab-rail-top);
  min-width: 0;
}

.page-about .ab-section::before {
  content: "";
  display: block;
  height: 2px;
  margin-bottom: 1.2rem;
  background-image: var(--ab-dash);
  opacity: .85;
}

.page-about .ab-section__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan-400);
}

.page-about .ab-section__title {
  margin: .5rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 4vw, 2.15rem);
  line-height: 1.25;
  letter-spacing: -.03em;
}

.page-about .ab-section__lead {
  margin: .8rem 0 0;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--mist-300);
}

.page-about .ab-section__prose {
  margin-top: 1.2rem;
}

.page-about .ab-section__prose p {
  margin: 0 0 1rem;
}

.page-about .ab-section__prose a,
.page-about .ab-cred__foot a,
.page-about .ab-cred__desc a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .ab-section__prose a:hover,
.page-about .ab-cred__foot a:hover,
.page-about .ab-cred__desc a:hover {
  color: var(--yellow-300);
}

/* ---------- 方法论引用区 ---------- */
.page-about .ab-quote {
  position: relative;
  margin: 1.8rem 0 0;
  padding: clamp(1.1rem, 3vw, 1.7rem) clamp(1.1rem, 3vw, 1.8rem) clamp(1.1rem, 3vw, 1.7rem) clamp(1.4rem, 3.5vw, 2rem);
  border: var(--stroke) solid var(--cyan-400);
  background: var(--pitch-800);
  box-shadow: var(--hard-shadow);
}

.page-about .ab-quote::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background-image: repeating-linear-gradient(180deg, var(--cyan-400) 0 10px, transparent 10px 20px);
}

.page-about .ab-quote__text {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.15rem, 3vw, 1.5rem);
  line-height: 1.5;
  letter-spacing: -.02em;
  color: var(--chalk-50);
}

.page-about .ab-quote__by {
  margin: .6rem 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist-300);
}

/* ---------- 图片 ---------- */
.page-about .ab-fig {
  margin: 1.6rem 0 0;
}

.page-about .ab-fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: var(--stroke) solid var(--line);
  background: var(--pitch-800);
  object-fit: cover;
  box-shadow: var(--hard-shadow-sm);
}

.page-about .ab-fig__cap {
  margin: .65rem 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--mist-300);
}

/* ---------- 团队网格 ---------- */
.page-about .ab-teams {
  display: grid;
  gap: 1px;
  margin-top: 1.6rem;
  border: var(--stroke) solid var(--line);
  background: var(--line);
}

.page-about .ab-team {
  padding: 1rem 1.1rem 1.1rem;
  background: var(--pitch-900);
}

.page-about .ab-team__name {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--chalk-50);
}

.page-about .ab-team__name::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: .55rem;
  background: var(--amber-500);
  transform: rotate(45deg) translateY(-2px);
}

.page-about .ab-team__desc {
  margin: .55rem 0 0;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--mist-300);
}

/* ---------- 流程步骤 ---------- */
.page-about .ab-flow {
  display: grid;
  gap: .8rem;
  margin-top: 1.6rem;
}

.page-about .ab-step {
  border: var(--stroke) solid var(--line);
  background: var(--pitch-900);
  box-shadow: var(--hard-shadow-sm);
}

.page-about .ab-step > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .7rem;
  padding: .95rem 1.1rem;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-step > summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-step > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--cyan-400);
}

.page-about .ab-step[open] > summary::after {
  content: "−";
  color: var(--yellow-300);
}

.page-about .ab-step[open] {
  background: var(--pitch-800);
  border-color: var(--cyan-400);
}

.page-about .ab-step[open] > summary {
  border-bottom: var(--stroke) solid var(--line);
}

.page-about .ab-step__no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--amber-500);
}

.page-about .ab-step__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--chalk-50);
}

.page-about .ab-step__body {
  padding: .95rem 1.1rem 1.1rem;
}

.page-about .ab-step__body p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--mist-300);
}

/* ---------- 资质 ---------- */
.page-about .ab-creds {
  display: grid;
  gap: 1rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-cred {
  padding: 1.05rem 1.15rem 1.15rem;
  border: var(--stroke) solid var(--line);
  border-left: 6px solid var(--amber-500);
  background: var(--pitch-900);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .ab-cred:hover {
  border-color: var(--cyan-400);
  box-shadow: var(--hard-shadow-sm);
}

.page-about .ab-cred__name {
  margin: .65rem 0 0;
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: -.01em;
}

.page-about .ab-cred__desc {
  margin: .55rem 0 0;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--mist-300);
}

.page-about .ab-cred__foot {
  margin: 1.3rem 0 0;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--mist-300);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners {
  display: grid;
  gap: 1px;
  margin-top: 1.6rem;
  border: var(--stroke) solid var(--line);
  background: var(--line);
}

.page-about .ab-partner {
  padding: 1rem 1.1rem 1.1rem;
  background: var(--pitch-900);
}

.page-about .ab-partner__name {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 900;
  color: var(--cyan-400);
}

.page-about .ab-partner__desc {
  margin: .5rem 0 0;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--mist-300);
}

/* ---------- 里程碑 ---------- */
.page-about .ab-miles {
  position: relative;
  margin: 1.6rem 0 0;
  padding: 0 0 0 1.1rem;
  list-style: none;
  border-left: var(--stroke) solid var(--line);
}

.page-about .ab-mile {
  position: relative;
  padding: 0 0 1.4rem;
}

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

.page-about .ab-mile::before {
  content: "";
  position: absolute;
  left: calc(-1.1rem - 6px);
  top: .45rem;
  width: 10px;
  height: 10px;
  background: var(--pitch-950);
  border: 2px solid var(--cyan-400);
  transform: rotate(45deg);
}

.page-about .ab-mile__season {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--yellow-300);
}

.page-about .ab-mile__text {
  margin: .4rem 0 0;
  font-size: .98rem;
  line-height: 1.8;
  color: var(--chalk-50);
}

.page-about .ab-honors {
  display: grid;
  gap: .8rem;
  margin-top: 1.8rem;
  padding: clamp(1rem, 3vw, 1.4rem);
  border: var(--stroke) dashed var(--cyan-400);
  background: var(--pitch-800);
}

.page-about .ab-honor {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .6rem;
  margin: 0;
  font-size: .96rem;
  line-height: 1.7;
  color: var(--mist-300);
}

.page-about .ab-honor__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  line-height: 1;
  color: var(--cyan-400);
}

/* ---------- 结尾 ---------- */
.page-about .ab-cta {
  position: relative;
  margin-top: 1rem;
  padding: clamp(1.4rem, 4vw, 2.4rem);
  border: var(--stroke) solid var(--line);
  background: linear-gradient(112deg, var(--pitch-800) 0 58%, var(--pitch-700) 58% 100%);
  box-shadow: var(--hard-shadow);
}

.page-about .ab-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.25rem, 3.6vw, 1.75rem);
  line-height: 1.3;
  letter-spacing: -.02em;
}

.page-about .ab-cta__text {
  margin: .8rem 0 0;
  max-width: 56ch;
  font-size: .98rem;
  line-height: 1.8;
  color: var(--mist-300);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.3rem;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 720px) {
  .page-about .ab-teams,
  .page-about .ab-partners {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1040px) {
  .page-about .ab-hero__grid {
    grid-template-columns: 7fr 3fr;
    align-items: end;
  }

  .page-about .ab-layout {
    grid-template-columns: 3fr 7fr;
    align-items: start;
  }

  .page-about .ab-rail {
    position: sticky;
    top: var(--ab-rail-top);
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow-x: visible;
  }

  .page-about .rail__item {
    border-top: var(--stroke) solid var(--line);
  }

  .page-about .rail__item:last-child {
    border-bottom: var(--stroke) solid var(--line);
  }

  .page-about .ab-rail__link {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: .7rem;
    border: 0;
    background: transparent;
    padding: .8rem .6rem;
  }

  .page-about .rail__item.is-active .ab-rail__link {
    background: var(--pitch-800);
    box-shadow: inset 3px 0 0 0 var(--cyan-400);
  }

  .page-about .ab-rail__text {
    white-space: normal;
  }
}

@media (min-width: 1200px) {
  .page-about .ab-teams {
    grid-template-columns: repeat(2, 1fr);
  }
}
<<<END>>>