.page-about {
  --about-paper-ink: #1b242e;
  --about-soft-line: rgba(244, 241, 232, .72);
  --about-muted: rgba(244, 241, 232, .74);
  display: block;
  background: var(--c-bg);
  color: var(--c-line);
  overflow-x: clip;
}

.page-about .about-p {
  max-width: var(--measure);
  margin: 0 0 1.2em;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--about-muted);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-cover {
  position: relative;
  padding-block-start: clamp(20px, 4vw, 44px);
}

.page-about .about-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(90deg, rgba(244, 241, 232, .05) 0 1px, transparent 1px 104px);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
}

.page-about .about-cover__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  padding-block: clamp(16px, 3vw, 40px) clamp(36px, 6vw, 76px);
  align-items: start;
}

.page-about .about-cover__copy {
  min-width: 0;
}

.page-about .about-cover__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.35rem, 8vw, 5.2rem);
  line-height: .98;
  letter-spacing: -.04em;
  color: var(--c-line);
}

.page-about .about-cover__title em {
  font-style: normal;
  color: var(--c-red);
}

.page-about .about-cover__lede {
  max-width: 58ch;
  margin-top: clamp(18px, 2.4vw, 26px);
  font-size: clamp(.975rem, 1.2vw, 1.0625rem);
  line-height: 1.78;
  color: var(--about-soft-line);
}

.page-about .about-cover__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-cover__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-xl);
  border: 1px solid var(--hairline);
  background: linear-gradient(150deg, var(--c-teal), var(--c-bg));
}

.page-about .about-cover__media::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 42%;
  pointer-events: none;
  background: linear-gradient(180deg, transparent, rgba(5, 8, 13, .78));
}

.page-about .about-cover__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 11;
  object-fit: cover;
}

.page-about .about-cover__media .media-caption {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 0 clamp(16px, 2.4vw, 24px) clamp(16px, 2.4vw, 22px);
  margin-top: calc(-1 * clamp(18px, 2.6vw, 26px));
  font-size: .8125rem;
  color: var(--c-paper);
}

/* ---------- 统计条 ---------- */
.page-about .about-stats {
  border-block: 1px solid var(--hairline);
  background: linear-gradient(180deg, rgba(17, 42, 51, .62), rgba(11, 18, 32, 0));
}

.page-about .about-stats__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 26px);
  margin: 0;
  padding-block: clamp(22px, 3.6vw, 38px);
}

.page-about .about-stats__item {
  margin: 0;
  display: flex;
  flex-direction: column-reverse;
  gap: 4px;
  min-width: 0;
  padding-left: 12px;
  border-left: 1px solid var(--hairline-strong);
}

.page-about .about-stats__item dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-stats__item dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .06em;
  color: var(--c-gray);
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2.25rem);
  line-height: 1;
  color: var(--c-line);
  letter-spacing: -.02em;
}

.page-about .about-stats__item:nth-child(3) .about-stats__num,
.page-about .about-stats__item:nth-child(4) .about-stats__num {
  color: var(--c-yellow);
}

.page-about .about-stats__unit {
  font-size: .8125rem;
  color: var(--c-gray);
}

/* ---------- 页内导读 ---------- */
.page-about .about-toc {
  position: relative;
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin: 0;
  padding: clamp(14px, 2vw, 20px) 0;
  list-style: none;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border-radius: var(--pill);
  border: 1px solid transparent;
  font-size: .8125rem;
  color: var(--c-gray);
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-toc__idx {
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .08em;
  color: var(--c-water);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--c-line);
  border-color: var(--hairline-strong);
}

.page-about .about-toc__link.is-active,
.page-about .about-toc__link[aria-current] {
  color: var(--c-black);
  background: var(--c-yellow);
  border-color: var(--c-yellow);
}

.page-about .about-toc__link.is-active .about-toc__idx,
.page-about .about-toc__link[aria-current] .about-toc__idx {
  color: var(--c-black);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  position: relative;
  padding-block: clamp(46px, 8vw, 100px);
}

.page-about .about-section__head {
  display: grid;
  gap: 12px;
  max-width: 50ch;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.8rem, 4.6vw, 3rem);
  line-height: 1.08;
  letter-spacing: -.035em;
  color: var(--c-line);
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-note {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius-lg);
  border-left: 6px solid var(--c-water);
  background: var(--c-paper);
  color: var(--about-paper-ink);
}

.page-about .about-note__k {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-teal);
}

.page-about .about-note p:not(.about-note__k) {
  margin: 0 0 .9em;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--about-paper-ink);
}

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

.page-about .about-lanes {
  display: grid;
  gap: 1px;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  background: var(--hairline);
  overflow: hidden;
}

.page-about .about-lanes__item {
  display: grid;
  gap: 6px;
  padding: clamp(18px, 3vw, 26px);
  background: var(--c-bg);
}

.page-about .about-lanes__idx {
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .14em;
  color: var(--c-red);
}

.page-about .about-lanes__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -.01em;
  color: var(--c-line);
}

.page-about .about-lanes__desc {
  margin: 0;
  font-size: .9rem;
  line-height: 1.68;
  color: var(--about-muted);
}

/* ---------- 斜切时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  padding: clamp(18px, 3vw, 34px) clamp(10px, 2vw, 26px);
  border-radius: var(--radius-xl);
  border: 1px solid var(--hairline);
  background:
    radial-gradient(120% 90% at 0% 0%, rgba(78, 140, 138, .18), transparent 62%),
    linear-gradient(180deg, rgba(17, 42, 51, .82), rgba(11, 18, 32, .22));
}

.page-about .about-timeline__list {
  display: grid;
  gap: clamp(10px, 1.8vw, 18px);
  margin: 0;
  padding: 0;
  list-style: none;
  isolation: isolate;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  gap: 8px;
  padding: clamp(20px, 3vw, 28px) clamp(18px, 3vw, 32px);
  isolation: isolate;
  transition: transform .28s var(--ease);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: var(--radius-md);
  background: linear-gradient(104deg, rgba(17, 42, 51, .97), rgba(11, 18, 32, .42) 78%);
  -webkit-clip-path: polygon(0 0, 100% 4.5%, 100% 100%, 0 95.5%);
  clip-path: polygon(0 0, 100% 4.5%, 100% 100%, 0 95.5%);
  transition: background .28s var(--ease);
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 22%;
  bottom: 22%;
  width: 3px;
  border-radius: var(--pill);
  background: var(--c-red);
}

.page-about .about-timeline__item:hover::before {
  background: linear-gradient(104deg, rgba(26, 58, 70, .98), rgba(11, 18, 32, .5) 78%);
}

.page-about .about-timeline__mark {
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .16em;
  color: var(--c-yellow);
}

.page-about .about-timeline__stage {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.0625rem, 2vw, 1.375rem);
  line-height: 1.28;
  letter-spacing: -.015em;
  color: var(--c-line);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--about-muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-team__media {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-xl);
  border: 1px solid var(--hairline);
  background: linear-gradient(150deg, var(--c-teal), var(--c-bg));
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .about-team__media .media-caption {
  margin: 0;
  padding: 14px clamp(16px, 2.4vw, 22px) clamp(16px, 2.4vw, 22px);
  font-size: .8125rem;
  color: var(--c-gray);
}

.page-about .about-roles {
  display: grid;
  gap: 1px;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  background: var(--hairline);
  overflow: hidden;
}

.page-about .about-roles__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 4px 12px;
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--c-bg);
}

.page-about .about-roles__n {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--c-water);
}

.page-about .about-roles__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--c-line);
}

.page-about .about-roles__desc {
  margin: 0;
  font-size: .9rem;
  line-height: 1.66;
  color: var(--about-muted);
}

/* ---------- 合作 ---------- */
.page-about .about-partners__inner {
  position: relative;
  padding: clamp(26px, 4vw, 46px) clamp(18px, 3vw, 40px);
  border-radius: var(--radius-xl);
  border: 1px solid var(--hairline);
  background: linear-gradient(155deg, rgba(17, 42, 51, .9), rgba(11, 18, 32, .55));
}

.page-about .about-partners__grid {
  display: grid;
  gap: clamp(14px, 2.4vw, 22px);
  margin-bottom: clamp(24px, 4vw, 38px);
}

.page-about .about-partners__stat {
  display: grid;
  gap: 4px;
  padding: clamp(16px, 2.6vw, 22px);
  border-radius: var(--radius-md);
  border: 1px solid var(--hairline);
  background: rgba(11, 18, 32, .55);
}

.page-about .about-partners__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--c-yellow);
}

.page-about .about-partners__label {
  font-size: .875rem;
  line-height: 1.5;
  color: var(--about-soft-line);
}

.page-about .about-partners__text {
  display: grid;
  gap: 0;
}

/* ---------- 版本 ---------- */
.page-about .about-versions__grid {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
  align-items: start;
}

.page-about .about-versions__media {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-xl);
  border: 1px solid var(--hairline);
  background: linear-gradient(160deg, var(--c-teal), var(--c-black));
}

.page-about .about-versions__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .about-versions__media .media-caption {
  margin: 0;
  padding: 14px clamp(16px, 2.4vw, 22px) clamp(16px, 2.4vw, 22px);
  font-size: .8125rem;
  color: var(--c-gray);
}

.page-about .about-versions__entries {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-versions__entry {
  padding: 8px 16px;
  border-radius: var(--pill);
  border: 1px solid var(--hairline-strong);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .06em;
  color: var(--c-line);
  background: rgba(78, 140, 138, .16);
}

.page-about .about-versions__links {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  margin: clamp(20px, 3vw, 28px) 0 0;
}

.page-about .about-link {
  display: inline-block;
  font-size: .9375rem;
  color: var(--c-water);
  text-decoration: none;
  border-bottom: 1px solid rgba(78, 140, 138, .55);
  padding-bottom: 2px;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--c-yellow);
  border-color: var(--c-yellow);
}

/* ---------- 原则 ---------- */
.page-about .about-promise__list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--hairline);
}

.page-about .about-promise__item {
  display: grid;
  gap: 6px;
  padding: clamp(18px, 3vw, 26px) 0;
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-promise__n {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .14em;
  color: var(--c-red);
}

.page-about .about-promise__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.25rem, 2.6vw, 1.75rem);
  letter-spacing: -.02em;
  color: var(--c-line);
}

.page-about .about-promise__desc {
  margin: 0;
  max-width: 46ch;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--about-muted);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(40px, 7vw, 84px);
}

.page-about .about-cta__inner {
  padding: clamp(26px, 4.4vw, 48px) clamp(20px, 3.4vw, 44px);
  border-radius: var(--radius-xl);
  border: 1px solid var(--hairline);
  background:
    radial-gradient(110% 120% at 100% 0%, rgba(226, 58, 46, .18), transparent 58%),
    linear-gradient(160deg, var(--c-teal), var(--c-bg));
}

.page-about .about-cta__title {
  margin: 12px 0 0;
  max-width: 26ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.35rem);
  line-height: 1.16;
  letter-spacing: -.03em;
  color: var(--c-line);
}

.page-about .about-cta__text {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 58ch;
  font-size: .975rem;
  line-height: 1.75;
  color: var(--about-soft-line);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .to-top {
  position: fixed;
  right: clamp(14px, 3vw, 30px);
  bottom: clamp(14px, 3vw, 30px);
  z-index: 40;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-stats__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-partners__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-versions__links {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 10px 24px;
  }
}

@media (min-width: 760px) {
  .page-about .about-timeline__item {
    grid-template-columns: 96px minmax(0, 1fr);
    align-items: start;
    gap: 0 clamp(16px, 2.4vw, 28px);
  }

  .page-about .about-timeline__mark {
    padding-top: 4px;
  }

  .page-about .about-promise__item {
    grid-template-columns: 60px 180px minmax(0, 1fr);
    align-items: baseline;
    gap: 12px clamp(16px, 2.4vw, 28px);
  }
}

@media (min-width: 900px) {
  .page-about .about-cover__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: clamp(28px, 4vw, 64px);
    align-items: end;
  }

  .page-about .about-cover__copy {
    padding-bottom: clamp(8px, 1.6vw, 20px);
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
    column-gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
    column-gap: clamp(32px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-versions__grid {
    grid-template-columns: minmax(0, 400px) minmax(0, 1fr);
    column-gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-partners__text {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(24px, 4vw, 56px);
  }
}

@media (min-width: 1100px) {
  .page-about .about-stats__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item,
  .page-about .about-toc__link,
  .page-about .about-link {
    transition: none;
  }

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