.page-about {
  --ab-cyan-deep: #0C6E5A;
  --ab-ink-soft: rgba(237, 232, 220, 0.82);
  --ab-ink-line: rgba(11, 31, 26, 0.14);
  background: var(--c-ink);
  color: var(--c-bone);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: clamp(96px, 14vw, 168px) 0 0;
}

.page-about .ab-hero__top {
  display: grid;
  gap: 22px;
  max-width: 980px;
  margin-top: 18px;
}

.page-about .ab-hero h1 {
  margin: 0;
  font-weight: 200;
  font-size: clamp(38px, 7.4vw, 96px);
  line-height: 1.02;
  letter-spacing: -0.035em;
  color: var(--c-bone);
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 56ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.65;
  color: var(--c-stone);
}

/* ---------- 数据带 ---------- */
.page-about .ab-band {
  margin-top: clamp(48px, 8vw, 88px);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  display: grid;
  grid-template-columns: 1fr;
}

.page-about .ab-band__cell {
  padding: 20px 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .ab-band__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-cyan);
  font-variant-numeric: tabular-nums;
  transition: color 0.24s var(--ease);
}

.page-about .ab-band__cell:hover .ab-band__num {
  color: var(--c-orange);
}

.page-about .ab-band__key {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--c-stone);
  letter-spacing: 0.02em;
}

@media (min-width: 720px) {
  .page-about .ab-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-band__cell {
    border-top: 0;
    border-left: 1px solid var(--line-soft);
    padding: 26px 22px;
  }
  .page-about .ab-band__cell:first-child {
    border-left: 0;
    padding-left: 0;
  }
}

/* ---------- 章节通用 ---------- */
.page-about .ab-block {
  padding: clamp(56px, 8vw, 104px) 0;
}

.page-about .ab-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line-soft);
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .ab-head__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-clay);
}

.page-about .ab-head__title {
  margin: 0;
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 300;
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--c-bone);
}

.page-about .ab-head__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--c-stone);
}

@media (min-width: 860px) {
  .page-about .ab-head {
    grid-template-columns: 72px minmax(0, 1fr) minmax(0, 340px);
    column-gap: 32px;
    align-items: end;
  }
  .page-about .ab-head__idx {
    padding-bottom: 6px;
  }
  .page-about .ab-head__note {
    padding-bottom: 6px;
  }
}

/* ---------- 起点 ---------- */
.page-about .ab-start {
  padding-top: clamp(48px, 6vw, 80px);
}

.page-about .ab-start__body {
  display: grid;
  gap: 16px;
  max-width: 64ch;
}

.page-about .ab-start__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.68;
  color: var(--ab-ink-soft);
}

.page-about .ab-note {
  margin: 32px 0 0;
  padding-left: 18px;
  border-left: 2px solid var(--c-clay);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-stone);
}

/* ---------- 时间线 ---------- */
.page-about .ab-track {
  padding: clamp(56px, 8vw, 104px) 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background: var(--c-ink-2);
}

.page-about .ab-jump {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 18px;
  margin-bottom: 6px;
  scrollbar-width: none;
}

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

.page-about .ab-jump a {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-stone);
  text-decoration: none;
  padding: 7px 13px;
  border: 1px solid var(--line-soft);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-jump a:hover,
.page-about .ab-jump a:focus-visible {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
}

.page-about .ab-rail {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-node {
  padding: 24px 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .ab-node__axis {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}

.page-about .ab-node__year {
  font-family: var(--font-mono);
  font-size: clamp(30px, 5.4vw, 54px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-stone);
  font-variant-numeric: tabular-nums;
  transition: color 0.24s var(--ease);
}

.page-about .ab-node:hover .ab-node__year {
  color: var(--c-cyan);
}

.page-about .ab-node__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-clay);
}

.page-about .ab-node__body p {
  margin: 0;
  max-width: 48ch;
  font-size: 16px;
  line-height: 1.66;
  color: var(--ab-ink-soft);
}

@media (min-width: 900px) {
  .page-about .ab-rail {
    position: relative;
  }
  .page-about .ab-rail::before {
    content: "";
    position: absolute;
    left: 168px;
    top: 12px;
    bottom: 36px;
    width: 1px;
    background: linear-gradient(180deg, var(--line-strong) 0%, rgba(200, 211, 204, 0.06) 100%);
  }
  .page-about .ab-node {
    display: grid;
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: 56px;
    padding: 0 0 56px;
    border-top: 0;
    position: relative;
  }
  .page-about .ab-node:first-child {
    padding-top: 0;
  }
  .page-about .ab-node:last-child {
    padding-bottom: 0;
  }
  .page-about .ab-node__axis {
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
    margin: 0;
    padding-right: 24px;
    text-align: right;
  }
  .page-about .ab-node__year {
    font-size: clamp(34px, 3.4vw, 52px);
  }
  .page-about .ab-node__body {
    position: relative;
    padding-top: 6px;
  }
  .page-about .ab-node__body::before {
    content: "";
    position: absolute;
    left: -56px;
    top: 26px;
    width: 48px;
    height: 1px;
    background: var(--line-strong);
  }
  .page-about .ab-node__body::after {
    content: "";
    position: absolute;
    left: -60px;
    top: 23px;
    width: 7px;
    height: 7px;
    background: var(--c-cyan);
    transform: rotate(45deg);
  }
}

/* ---------- 比赛日运转 ---------- */
.page-about .ab-ops {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(56px, 8vw, 108px) 0;
}

.page-about .ab-ops__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  opacity: 0.3;
  filter: saturate(0.75);
}

.page-about .ab-ops::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(100deg, var(--c-ink) 6%, rgba(11, 31, 26, 0.72) 52%, rgba(11, 31, 26, 0.94) 100%);
}

.page-about .ab-ops__grid {
  display: grid;
  gap: 30px;
}

.page-about .ab-ops__col {
  display: grid;
  gap: 16px;
  max-width: 58ch;
}

.page-about .ab-ops__col p {
  margin: 0;
  font-size: 16px;
  line-height: 1.68;
  color: var(--ab-ink-soft);
}

.page-about .ab-ops__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  align-content: start;
}

.page-about .ab-ops__facts li {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-ops__fact-num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-orange);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-ops__fact-key {
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-stone);
}

@media (min-width: 900px) {
  .page-about .ab-ops__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.72fr);
    gap: clamp(32px, 6vw, 88px);
    align-items: start;
  }
  .page-about .ab-ops__facts li:first-child {
    border-top: 0;
    padding-top: 6px;
  }
}

/* ---------- 引述 ---------- */
.page-about .ab-quote {
  margin: clamp(48px, 7vw, 96px) 0;
}

.page-about .ab-quote__panel {
  padding: clamp(40px, 6vw, 88px) var(--gutter);
  background: var(--c-moss);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 36px), calc(100% - 36px) 100%, 0 100%);
  display: grid;
  gap: 22px;
  justify-items: start;
}

.page-about .ab-quote__text {
  margin: 0;
  max-width: 24ch;
  font-size: clamp(22px, 3.8vw, 48px);
  font-weight: 200;
  line-height: 1.32;
  letter-spacing: -0.015em;
  color: var(--c-bone);
}

.page-about .ab-quote__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-cyan);
}

/* ---------- 设计主张 ---------- */
.page-about .ab-craft {
  background: var(--c-bone);
  color: var(--c-ink);
  padding: clamp(56px, 8vw, 108px) 0;
}

.page-about .ab-craft .ab-head {
  border-bottom-color: var(--ab-ink-line);
}

.page-about .ab-craft .ab-head__idx {
  color: var(--c-clay);
}

.page-about .ab-craft .ab-head__title {
  color: var(--c-ink);
}

.page-about .ab-craft .ab-head__note {
  color: #4A6257;
}

.page-about .ab-craft__grid {
  display: grid;
  gap: clamp(32px, 5vw, 64px);
}

.page-about .ab-craft__copy p {
  margin: 0 0 16px;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.68;
  color: rgba(11, 31, 26, 0.8);
}

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

.page-about .ab-craft__list {
  list-style: none;
  margin: 26px 0;
  padding: 0;
  display: grid;
}

.page-about .ab-craft__list li {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-top: 1px solid var(--ab-ink-line);
}

.page-about .ab-craft__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-teal-ink);
}

.page-about .ab-craft__v {
  font-size: 15px;
  line-height: 1.6;
  color: rgba(11, 31, 26, 0.72);
}

.page-about .ab-craft__figure {
  margin: 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
  background: var(--c-moss);
}

.page-about .ab-craft__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

@media (min-width: 560px) {
  .page-about .ab-craft__list li {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .ab-craft__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }
}

/* ---------- 覆盖与语言 ---------- */
.page-about .ab-reach {
  padding-top: clamp(56px, 8vw, 104px);
}

.page-about .ab-reach__grid {
  display: grid;
  gap: 18px;
  max-width: 76ch;
}

.page-about .ab-reach__grid p {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ab-ink-soft);
}

.page-about .ab-reach__lead {
  font-size: clamp(17px, 1.9vw, 20px) !important;
  line-height: 1.66 !important;
  color: var(--c-bone) !important;
}

.page-about .ab-num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--c-cyan);
  font-variant-numeric: tabular-nums;
}

/* ---------- 一起做事 ---------- */
.page-about .ab-join {
  padding: clamp(56px, 8vw, 104px) 0;
  border-top: 1px solid var(--line-soft);
  margin-top: clamp(48px, 7vw, 88px);
}

.page-about .ab-join__inner {
  display: grid;
  gap: clamp(28px, 5vw, 64px);
}

.page-about .ab-join__copy h2 {
  margin: 0 0 16px;
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 300;
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--c-bone);
}

.page-about .ab-join__copy p {
  margin: 0 0 14px;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.68;
  color: var(--ab-ink-soft);
}

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

.page-about .ab-join__act {
  display: grid;
  gap: 12px;
  align-content: start;
  justify-items: start;
}

.page-about .ab-join__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-stone);
}

@media (min-width: 900px) {
  .page-about .ab-join__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    align-items: start;
  }
  .page-about .ab-join__act {
    justify-items: end;
    text-align: right;
    padding-top: 8px;
  }
}

/* ---------- 收尾图 ---------- */
.page-about .ab-close {
  margin: 0;
  position: relative;
}

.page-about .ab-close img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  filter: saturate(0.8);
}

.page-about .ab-close__cap {
  position: absolute;
  left: var(--gutter);
  bottom: clamp(14px, 3vw, 28px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-bone);
  text-shadow: 0 1px 12px rgba(11, 31, 26, 0.8);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-band__num,
  .page-about .ab-node__year,
  .page-about .ab-jump a {
    transition: none;
  }
}
<<<END>>>