.page-about {
  --about-rule: 2px solid var(--line-800);
  --about-side: 300px;
  background: var(--ink-900);
  color: var(--white-050);
  padding-bottom: clamp(40px, 7vw, 96px);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-top: calc(var(--header-h) + 22px);
  padding-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--steel-400);
  text-transform: uppercase;
}

.page-about .breadcrumb a {
  color: var(--steel-400);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--grass-500);
}

.page-about .prose p {
  margin: 0 0 1.1em;
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--white-050);
}

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

/* ---------- 通用小元件 ---------- */

.page-about .about-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--grass-500);
  text-transform: uppercase;
}

.page-about .about-eyebrow .num {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 22px;
  border: 2px solid var(--grass-700);
  color: var(--neon-500);
  font-size: 12px;
}

.page-about .about-section-lede {
  max-width: 62ch;
  margin: 0 0 clamp(28px, 4vw, 48px);
  font-size: 17px;
  line-height: 1.75;
  color: var(--steel-400);
}

.page-about .shot {
  position: relative;
  overflow: hidden;
  border: 3px solid var(--line-600);
  box-shadow: var(--shadow-hard-ink);
  background: var(--ink-700);
}

.page-about .shot > img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.88) contrast(1.06) brightness(.92);
}

.page-about figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--steel-400);
}

.page-about .dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  flex: 0 0 8px;
  margin-top: 7px;
}

.page-about .dot--grass { background: var(--grass-500); }
.page-about .dot--orange { background: var(--neon-500); }
.page-about .dot--cyan { background: var(--cyan-400); }

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(18px, 3vw, 34px) 0 clamp(36px, 6vw, 72px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  grid-template-columns: 1fr;
  align-items: center;
}

.page-about .about-hero__kicker {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan-400);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 6vw, 4.1rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--white-050);
}

.page-about .about-hero h1::after {
  content: "";
  display: block;
  width: 92px;
  height: 8px;
  margin-top: 22px;
  background: var(--grass-500);
}

.page-about .about-hero__lede {
  max-width: 60ch;
  margin: 0 0 28px;
  font-size: 17px;
  line-height: 1.78;
  color: var(--steel-400);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__figure {
  margin: 0;
}

/* ---------- 7 / 3 杂志网格 ---------- */

.page-about .about-grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  grid-template-columns: 1fr;
}

.page-about .about-scope h2,
.page-about .about-ladder h2,
.page-about .about-rounds h2,
.page-about .about-history h2,
.page-about .about-team h2,
.page-about .about-partners h2 {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.6vw, 2.6rem);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.015em;
  color: var(--white-050);
}

/* ---------- 数据点 ---------- */

.page-about .about-stats {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .about-stat {
  padding: 20px 20px 18px;
  background: var(--ink-700);
  border-left: 5px solid var(--grass-500);
}

.page-about .about-stat--violet { border-left-color: var(--violet-500); }
.page-about .about-stat--orange { border-left-color: var(--neon-500); }

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--grass-500);
}

.page-about .about-stat--violet .about-stat__num { color: var(--violet-500); }
.page-about .about-stat--orange .about-stat__num { color: var(--neon-500); }

.page-about .about-stat__unit {
  display: block;
  margin: 8px 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--steel-400);
  text-transform: uppercase;
}

.page-about .about-stat p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel-400);
}

/* ---------- 侧栏 ---------- */

.page-about .about-side__sticky {
  display: grid;
  gap: 16px;
}

.page-about .side-card {
  padding: 20px;
  background: var(--ink-700);
  border: var(--about-rule);
  border-top: 5px solid var(--grass-500);
}

.page-about .side-card--flat {
  border-top: 5px solid var(--violet-500);
}

.page-about .side-card__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--white-050);
}

.page-about .side-card__list {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .side-card__list li {
  display: flex;
  gap: 10px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--steel-400);
}

.page-about .side-card__note {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-600);
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel-400);
}

.page-about .side-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 梯队刻度尺 ---------- */

.page-about .about-ladder {
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
  background:
    linear-gradient(180deg, rgba(16, 28, 58, .85) 0%, rgba(8, 15, 34, 1) 62%);
}

.page-about .ladder {
  position: relative;
}

.page-about .ladder__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  padding: 0;
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

.page-about .ladder__rail {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 2px;
  background: var(--line-800);
  border: 2px solid var(--line-800);
  margin-bottom: 22px;
}

.page-about .ladder__tab {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 14px 4px 12px;
  background: var(--ink-700);
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease);
}

.page-about .ladder__tab::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 2px;
  height: 10px;
  background: var(--line-600);
  transform: translateX(-50%);
}

.page-about .ladder__code {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--steel-400);
}

.page-about .ladder__cap {
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--line-600);
}

.page-about .ladder__tab:hover .ladder__code {
  color: var(--cyan-400);
}

.page-about .ladder__panels {
  display: grid;
}

.page-about .ladder__panel {
  display: none;
  padding: clamp(20px, 3vw, 30px);
  background: var(--ink-700);
  border: 2px solid var(--line-600);
  border-left: 6px solid var(--violet-500);
  box-shadow: var(--shadow-hard-ink);
}

.page-about .ladder__panel h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.4vw, 1.4rem);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--white-050);
}

.page-about .ladder__panel p {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--steel-400);
}

.page-about #band-u9:checked ~ .ladder__rail [for="band-u9"],
.page-about #band-u10:checked ~ .ladder__rail [for="band-u10"],
.page-about #band-u11:checked ~ .ladder__rail [for="band-u11"],
.page-about #band-u12:checked ~ .ladder__rail [for="band-u12"],
.page-about #band-u13:checked ~ .ladder__rail [for="band-u13"],
.page-about #band-u15:checked ~ .ladder__rail [for="band-u15"],
.page-about #band-u17:checked ~ .ladder__rail [for="band-u17"],
.page-about #band-u19:checked ~ .ladder__rail [for="band-u19"] {
  background: var(--ink-500);
}

.page-about #band-u9:checked ~ .ladder__rail [for="band-u9"] .ladder__code,
.page-about #band-u10:checked ~ .ladder__rail [for="band-u10"] .ladder__code,
.page-about #band-u11:checked ~ .ladder__rail [for="band-u11"] .ladder__code,
.page-about #band-u12:checked ~ .ladder__rail [for="band-u12"] .ladder__code,
.page-about #band-u13:checked ~ .ladder__rail [for="band-u13"] .ladder__code,
.page-about #band-u15:checked ~ .ladder__rail [for="band-u15"] .ladder__code,
.page-about #band-u17:checked ~ .ladder__rail [for="band-u17"] .ladder__code,
.page-about #band-u19:checked ~ .ladder__rail [for="band-u19"] .ladder__code {
  color: var(--white-050);
}

.page-about #band-u9:checked ~ .ladder__rail [for="band-u9"] .ladder__cap,
.page-about #band-u10:checked ~ .ladder__rail [for="band-u10"] .ladder__cap,
.page-about #band-u11:checked ~ .ladder__rail [for="band-u11"] .ladder__cap,
.page-about #band-u12:checked ~ .ladder__rail [for="band-u12"] .ladder__cap,
.page-about #band-u13:checked ~ .ladder__rail [for="band-u13"] .ladder__cap,
.page-about #band-u15:checked ~ .ladder__rail [for="band-u15"] .ladder__cap,
.page-about #band-u17:checked ~ .ladder__rail [for="band-u17"] .ladder__cap,
.page-about #band-u19:checked ~ .ladder__rail [for="band-u19"] .ladder__cap {
  color: var(--neon-500);
}

.page-about #band-u9:checked ~ .ladder__panels .ladder__panel--u9,
.page-about #band-u10:checked ~ .ladder__panels .ladder__panel--u10,
.page-about #band-u11:checked ~ .ladder__panels .ladder__panel--u11,
.page-about #band-u12:checked ~ .ladder__panels .ladder__panel--u12,
.page-about #band-u13:checked ~ .ladder__panels .ladder__panel--u13,
.page-about #band-u15:checked ~ .ladder__panels .ladder__panel--u15,
.page-about #band-u17:checked ~ .ladder__panels .ladder__panel--u17,
.page-about #band-u19:checked ~ .ladder__panels .ladder__panel--u19 {
  display: block;
}

.page-about .ladder__radio:focus-visible ~ .ladder__rail {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
}

.page-about .about-ladder__figure {
  margin: clamp(32px, 5vw, 56px) 0 0;
  max-width: 620px;
}

/* ---------- 轮次对照 ---------- */

.page-about .about-rounds__inner {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  grid-template-columns: 1fr;
  align-items: start;
}

.page-about .about-rounds__link {
  margin: 26px 0 0;
  padding-left: 16px;
  border-left: 4px solid var(--grass-500);
  font-size: 15px;
  line-height: 1.75;
  color: var(--steel-400);
}

.page-about .about-rounds__link a {
  color: var(--grass-500);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .about-rounds__link a:hover {
  color: var(--cyan-400);
}

.page-about .round-track {
  padding: clamp(20px, 3vw, 28px);
  background: var(--ink-700);
  border: 2px solid var(--line-600);
  box-shadow: var(--shadow-hard);
}

.page-about .round-track__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-bottom: 14px;
}

.page-about .round-track__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--steel-400);
  text-transform: uppercase;
}

.page-about .round-track__cells {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 3px;
}

.page-about .round-track__cells span {
  display: block;
  padding: 8px 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--steel-400);
  background: var(--ink-500);
  border-bottom: 3px solid var(--line-600);
}

.page-about .round-track__row--now .round-track__cells span {
  color: var(--ink-900);
  background: var(--grass-500);
  border-bottom-color: var(--grass-700);
  font-weight: 700;
}

.page-about .round-track__note {
  margin: 6px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line-600);
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel-400);
}

/* ---------- 时间线 ---------- */

.page-about .about-history__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  grid-template-columns: 1fr;
  align-items: start;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 11px;
  width: 2px;
  background: var(--line-600);
}

.page-about .timeline__item {
  position: relative;
  margin-bottom: 14px;
}

.page-about .timeline__step {
  position: absolute;
  left: -30px;
  top: 12px;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--grass-500);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--grass-500);
  z-index: 1;
}

.page-about .timeline__panel {
  background: var(--ink-700);
  border: 2px solid var(--line-800);
  border-left: 5px solid var(--line-600);
  transition: border-left-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .timeline__panel[open] {
  border-left-color: var(--grass-500);
}

.page-about .timeline__panel:hover {
  transform: translateY(-2px);
}

.page-about .timeline__summary {
  cursor: pointer;
  padding: 16px 18px;
  list-style: none;
}

.page-about .timeline__summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline__summary h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  font-weight: 700;
  letter-spacing: -.005em;
  color: var(--white-050);
}

.page-about .timeline__summary h3::after {
  content: "+";
  float: right;
  margin-left: 12px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--neon-500);
}

.page-about .timeline__panel[open] .timeline__summary h3::after {
  content: "–";
}

.page-about .timeline__summary:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: -3px;
}

.page-about .timeline__content {
  padding: 0 18px 18px;
}

.page-about .timeline__content p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--steel-400);
}

.page-about .about-history__figure {
  margin: 0;
}

/* ---------- 团队 ---------- */

.page-about .about-team__grid {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .about-team__card {
  padding: 22px 20px;
  background: var(--ink-700);
  border: 2px solid var(--line-800);
  border-top: 5px solid var(--grass-500);
}

.page-about .about-team__card--cyan { border-top-color: var(--cyan-400); }
.page-about .about-team__card--orange { border-top-color: var(--neon-500); }
.page-about .about-team__card--violet { border-top-color: var(--violet-500); }

.page-about .about-team__card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--white-050);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--steel-400);
}

.page-about .about-team__link {
  margin: 24px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--steel-400);
}

.page-about .about-team__link a {
  color: var(--grass-500);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .about-team__link a:hover {
  color: var(--cyan-400);
}

/* ---------- 合作 ---------- */

.page-about .about-partners {
  border-top: var(--about-rule);
}

.page-about .about-partners__inner {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  grid-template-columns: 1fr;
  align-items: start;
}

.page-about .partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .partner-list__item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 18px;
  background: var(--ink-700);
  border-left: 5px solid var(--neon-500);
}

.page-about .partner-list__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--neon-500);
}

.page-about .partner-list__item h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--white-050);
}

.page-about .partner-list__item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel-400);
}

/* ---------- 结尾 ---------- */

.page-about .about-cta {
  margin-top: clamp(36px, 6vw, 72px);
}

.page-about .about-cta__inner {
  padding: clamp(28px, 4vw, 48px);
  background: linear-gradient(110deg, var(--ink-700) 0%, var(--ink-500) 100%);
  border: 3px solid var(--grass-700);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  font-weight: 900;
  letter-spacing: -.015em;
  color: var(--white-050);
}

.page-about .about-cta__copy {
  margin: 0 0 24px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--steel-400);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 动效与可访问性 ---------- */

.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .45s var(--ease), transform .45s var(--ease);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about .timeline__panel,
  .page-about .ladder__tab {
    transition: none;
    opacity: 1;
    transform: none;
  }
}

/* ---------- 响应式 ---------- */

@media (min-width: 560px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-grid,
  .page-about .about-rounds__inner,
  .page-about .about-partners__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
  }

  .page-about .about-grid__side {
    align-self: stretch;
  }

  .page-about .about-side__sticky {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-rounds__visual {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .ladder__rail {
    grid-template-columns: repeat(8, minmax(0, 1fr));
  }

  .page-about .round-track__row {
    grid-template-columns: 96px minmax(0, 1fr);
    align-items: center;
    gap: 12px;
  }
}

@media (min-width: 1120px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
<<<END>>>