.page-about {
  --about-max: 1220px;
  --about-rail: 88px;
  background: var(--ink-900);
  color: var(--paper-100);
  font-family: var(--font-body);
  letter-spacing: 0.01em;
  overflow-x: hidden;
  padding-bottom: clamp(32px, 5vw, 64px);
}

.page-about .about-shell {
  width: 100%;
  max-width: var(--about-max);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

/* 面包屑 */
.page-about .crumbs {
  padding-top: clamp(18px, 3vw, 28px);
  font-size: var(--step--1);
}
.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--mist-500);
}
.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-600);
}
.page-about .crumbs a {
  color: var(--mist-300);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}
.page-about .crumbs a:hover {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

/* 首屏 */
.page-about .about-hero {
  padding-block: clamp(26px, 4vw, 44px) clamp(40px, 6vw, 72px);
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}
.page-about .about-hero__text .eyebrow {
  color: var(--cyan-400);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.16em;
  margin: 0;
}
.page-about .about-hero__title {
  margin: 0.35em 0 0.45em;
  font-size: clamp(34px, 6.6vw, 68px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: 0.01em;
  color: var(--paper-100);
}
.page-about .about-hero__lead {
  max-width: 56ch;
  margin: 0 0 1.6em;
  font-size: var(--step-1);
  line-height: 1.75;
  color: var(--mist-300);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 图片容器 */
.page-about .about-fig {
  margin: 0;
  position: relative;
}
.page-about .about-fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-b);
  background: var(--ink-800);
}
.page-about .about-fig--hero img {
  aspect-ratio: 4 / 3;
}
.page-about .about-fig__cap {
  margin: 10px 0 0;
  font-size: var(--step--1);
  line-height: 1.6;
  color: var(--mist-500);
}

/* 首屏数据条 */
.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(30px, 5vw, 54px) 0 0;
  background: var(--line-600);
  border-top: 1px solid var(--line-600);
  border-bottom: 1px solid var(--line-600);
}
.page-about .about-facts > div {
  background: var(--ink-900);
  padding: 16px 6px 18px;
}
.page-about .about-facts dt {
  font-size: var(--step--1);
  color: var(--mist-500);
  letter-spacing: 0.08em;
}
.page-about .about-facts dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  color: var(--paper-100);
}
.page-about .about-facts > div:first-child dd {
  color: var(--cyan-400);
}

/* 章节骨架 */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 3vw, 28px);
  padding-block: clamp(44px, 7vw, 92px);
  border-top: 1px solid var(--line-600);
}
.page-about .about-chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.page-about .about-chapter__num {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 58px);
  line-height: 0.85;
  letter-spacing: -0.02em;
  color: var(--cyan-400);
}
.page-about .about-chapter__year {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.14em;
  color: var(--mist-500);
}
.page-about .about-chapter__title {
  margin: 0 0 0.75em;
  font-size: var(--step-2);
  font-weight: 600;
  line-height: 1.22;
  color: var(--paper-100);
}
.page-about .about-chapter__body p {
  max-width: 62ch;
  margin: 0 0 1.1em;
  line-height: 1.85;
  color: var(--mist-300);
}
.page-about .about-chapter__body p strong {
  color: var(--paper-100);
  font-weight: 600;
}

.page-about .about-quote {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 16px 0 16px 22px;
  border-left: 2px solid var(--cyan-400);
  max-width: 46ch;
  font-size: var(--step-1);
  line-height: 1.65;
  color: var(--paper-100);
}

/* 准则列表 */
.page-about .about-rules {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
}
.page-about .about-rule {
  position: relative;
  padding-left: 22px;
}
.page-about .about-rule::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: var(--cyan-400);
  transition: width 180ms var(--ease);
}
.page-about .about-rule:hover::before,
.page-about .about-rule:focus-within::before {
  width: 4px;
}
.page-about .about-rule__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.16em;
  color: var(--mist-500);
}
.page-about .about-rule__title {
  margin: 6px 0 8px;
  font-size: var(--step-1);
  font-weight: 600;
  color: var(--paper-100);
}
.page-about .about-rule p {
  margin: 0;
  max-width: 58ch;
  line-height: 1.8;
  color: var(--mist-300);
}

/* 团队：图文错位 + 数字矩阵 */
.page-about .about-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(20px, 3vw, 32px);
}
.page-about .about-fig--band img {
  aspect-ratio: 3 / 2;
}
.page-about .about-band__side p {
  margin-top: 0;
}
.page-about .about-shift {
  margin-top: clamp(16px, 2.4vw, 24px);
  padding-top: 14px;
  border-top: 1px solid var(--line-600);
}
.page-about .about-shift__head {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--mist-500);
  letter-spacing: 0.06em;
}
.page-about .about-shift__track {
  display: flex;
  gap: 6px;
  margin-top: 10px;
}
.page-about .about-shift__seg {
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: var(--turf-700);
  transition: background 180ms var(--ease);
}
.page-about .about-shift__seg--night {
  background: linear-gradient(90deg, var(--orange-500), var(--amber-300));
}
.page-about .about-shift__track:hover .about-shift__seg {
  background: var(--line-600);
}
.page-about .about-shift__track:hover .about-shift__seg--night {
  background: var(--orange-500);
}
.page-about .about-shift__note {
  margin: 10px 0 0;
  font-size: var(--step--1);
  color: var(--mist-500);
}

.page-about .about-team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  background: var(--line-600);
  border: 1px solid var(--line-600);
  border-radius: 4px;
  overflow: hidden;
}
.page-about .about-team-stats > div {
  background: var(--ink-800);
  padding: 18px 16px 20px;
}
.page-about .about-team-stats dt {
  font-size: var(--step--1);
  color: var(--mist-300);
}
.page-about .about-team-stats dd {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.6vw, 44px);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--paper-100);
}
.page-about .about-team-stats dd span {
  margin-left: 4px;
  font-family: var(--font-body);
  font-size: var(--step--1);
  color: var(--mist-500);
}
.page-about .about-team-stats > div:first-child dd {
  color: var(--cyan-400);
}

/* 覆盖范围 */
.page-about .about-leagues {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 1.4em;
  padding: 0;
}
.page-about .about-league {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 16px;
  padding-block: 20px;
  border-top: 1px solid var(--line-600);
}
.page-about .about-league:last-child {
  border-bottom: 1px solid var(--line-600);
}
.page-about .about-league__idx {
  grid-row: 1 / span 2;
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--cyan-400);
}
.page-about .about-league__name {
  margin: 0;
  font-size: var(--step-1);
  font-weight: 600;
  color: var(--paper-100);
}
.page-about .about-league p {
  margin: 0;
  max-width: 56ch;
  line-height: 1.8;
  color: var(--mist-300);
}

/* 里程碑 */
.page-about .about-milestones {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(20px, 3vw, 30px);
}
.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  position: relative;
}
.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 14px;
  width: 1px;
  background: var(--line-600);
}
.page-about .about-tl__item {
  position: relative;
  padding-bottom: 28px;
}
.page-about .about-tl__item:last-child {
  padding-bottom: 0;
}
.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan-400);
  transition: box-shadow 180ms var(--ease);
}
.page-about .about-tl__item--product::before {
  border-color: var(--orange-500);
}
.page-about .about-tl__item:target::before {
  box-shadow: 0 0 0 5px rgba(70, 242, 200, 0.22);
}
.page-about .about-tl__item--product:target::before {
  box-shadow: 0 0 0 5px rgba(255, 122, 51, 0.22);
}
.page-about .about-tl__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.06em;
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms var(--ease);
}
.page-about .about-tl__item--product .about-tl__year {
  color: var(--orange-500);
}
.page-about .about-tl__year:hover {
  border-bottom-color: currentColor;
}
.page-about .about-tl__text {
  margin: 8px 0 0;
  max-width: 54ch;
  line-height: 1.8;
  color: var(--mist-300);
}
.page-about .about-tl__text strong {
  color: var(--paper-100);
  font-weight: 600;
}
.page-about .about-fig--tl img {
  aspect-ratio: 5 / 4;
  border-radius: var(--radius-a);
}

.page-about .about-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  list-style: none;
  font-size: var(--step--1);
  color: var(--mist-500);
}
.page-about .about-legend li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.page-about .about-legend__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan-400);
}
.page-about .about-legend__dot--product {
  background: var(--orange-500);
}

/* 合作与纠错 */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(20px, 3vw, 30px);
}
.page-about .about-coop {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}
.page-about .about-coop li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 16px 0;
  border-top: 1px solid var(--line-600);
  line-height: 1.75;
  color: var(--mist-300);
}
.page-about .about-coop li:last-child {
  border-bottom: 1px solid var(--line-600);
}
.page-about .about-coop span {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--cyan-400);
}

.page-about .about-note {
  background: var(--ink-800);
  border: 1px solid var(--line-600);
  border-radius: var(--radius-b);
  padding: clamp(20px, 3vw, 30px);
}
.page-about .about-note h3 {
  margin: 0 0 12px;
  font-size: var(--step-1);
  font-weight: 600;
  color: var(--cyan-400);
}
.page-about .about-note p {
  margin: 0 0 0.9em;
  line-height: 1.8;
  color: var(--mist-300);
}
.page-about .about-note p:last-child {
  margin-bottom: 0;
}

/* 收束行动区 */
.page-about .about-cta {
  margin-top: clamp(40px, 6vw, 84px);
  padding: clamp(26px, 4.5vw, 56px);
  border: 1px solid var(--line-600);
  border-radius: var(--radius-a);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(70, 242, 200, 0.14), transparent 58%),
    linear-gradient(120deg, var(--turf-700), var(--ink-800));
}
.page-about .about-cta h2 {
  margin: 0 0 0.55em;
  font-size: var(--step-2);
  font-weight: 600;
  line-height: 1.25;
  color: var(--paper-100);
}
.page-about .about-cta p {
  max-width: 54ch;
  margin: 0;
  line-height: 1.8;
  color: var(--mist-300);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}
.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 22px;
  font-size: var(--step--1);
}
.page-about .about-cta__links a {
  color: var(--mist-300);
  text-decoration: none;
  border-bottom: 1px solid var(--line-600);
  padding-bottom: 2px;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}
.page-about .about-cta__links a:hover {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

/* 章节编号入场微位移 */
@media (prefers-reduced-motion: no-preference) {
  .page-about .about-chapter__num {
    animation: about-num-in 600ms var(--ease) both;
  }
}
@keyframes about-num-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 平板 */
@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-team-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* 桌面：非对称栅格 */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(240px, 0.58fr);
    gap: clamp(28px, 4vw, 56px);
  }
  .page-about .about-fig--hero img {
    aspect-ratio: 3 / 4;
  }
  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }
  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    position: sticky;
    top: 96px;
    align-self: start;
  }
  .page-about .about-band {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
  }
  .page-about .about-milestones {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: start;
  }
  .page-about .about-fig--tl {
    position: sticky;
    top: 104px;
  }
  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
  .page-about .about-rules {
    gap: 30px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-chapter__body {
    padding-right: clamp(0px, 3vw, 48px);
  }
}
<<<END>>>