.page-about {
  --about-idx: 216px;
  --about-gap: 56px;
}

.page-about p {
  margin: 14px 0 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--muted);
}
.page-about a {
  color: var(--lime);
  text-decoration: none;
}
.page-about a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: 20px 0 44px;
}
.page-about .about-hero__frame {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border: 1px solid var(--line);
  padding: 34px 20px 30px;
  background:
    radial-gradient(120% 100% at 0% 0%, rgba(127, 168, 201, 0.14), transparent 55%),
    radial-gradient(90% 90% at 100% 8%, rgba(198, 255, 61, 0.12), transparent 62%),
    linear-gradient(155deg, var(--ink-2) 0%, var(--ink) 74%);
}
.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 10px;
  background-image: repeating-linear-gradient(to right, rgba(143, 163, 154, 0.45) 0 1px, transparent 1px 13px);
  -webkit-mask-image: linear-gradient(to right, #000 0 55%, transparent 100%);
  mask-image: linear-gradient(to right, #000 0 55%, transparent 100%);
  pointer-events: none;
}
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  right: 14px;
  bottom: 14px;
  width: 38px;
  height: 38px;
  border-right: 1px solid var(--lime);
  border-bottom: 1px solid var(--lime);
  opacity: 0.65;
  pointer-events: none;
}
.page-about .about-hero h1 {
  margin: 12px 0 0;
  max-width: 16em;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.8rem, 7.2vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--paper);
}
.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-hero__stats li {
  border-left: 2px solid var(--line);
  padding-left: 12px;
}
.page-about .about-hero__stats .num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}
.page-about .about-hero__stats li > span:last-child {
  display: block;
  margin-top: 4px;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-shell {
  padding-bottom: 64px;
}

.page-about .about-index {
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 12px;
}
.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 8px 0 0;
  padding: 0 0 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .about-index__list::-webkit-scrollbar {
  height: 0;
}
.page-about .about-index__list li {
  flex: 0 0 auto;
}
.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 10px 6px 8px;
  border-left: 2px solid var(--line);
  font-size: 0.8125rem;
  color: var(--muted);
  white-space: nowrap;
  transition: color 0.18s var(--ease-out), border-color 0.18s var(--ease-out);
}
.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--lime);
  border-left-color: var(--lime);
  text-decoration: none;
}
.page-about .about-index__list .num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--steel);
}

.page-about .about-flow {
  display: grid;
  gap: 60px;
  min-width: 0;
  padding-top: 28px;
}

.page-about .about-block {
  scroll-margin-top: 24px;
  min-width: 0;
}
.page-about .about-block h2 {
  margin: 10px 0 0;
  max-width: 22em;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.4rem, 4.6vw, 2.25rem);
  line-height: 1.26;
  letter-spacing: -0.02em;
  color: var(--paper);
}
.page-about .about-block h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}
.page-about .about-block p {
  max-width: 36em;
}

/* ---------- 图片 ---------- */
.page-about .about-figure,
.page-about .about-team__figure,
.page-about .about-timeline__figure {
  margin: 26px 0 0;
}
.page-about .about-figure img,
.page-about .about-team__figure img,
.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--card);
}
.page-about figcaption {
  margin-top: 10px;
  border-left: 1px solid var(--line);
  padding-left: 10px;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 引文卡 ---------- */
.page-about .about-note {
  margin: 30px 0 0;
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--lime);
  background: var(--card);
  box-shadow: 10px 10px 0 -1px var(--line-soft);
}
.page-about .about-note__kicker {
  margin: 0;
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--lime);
}
.page-about .about-note__text {
  margin: 10px 0 0;
  max-width: 28em;
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--paper);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 24px;
  margin-top: 26px;
}
.page-about .about-team__figure {
  margin: 0;
}
.page-about .about-team__item {
  border: 1px solid var(--line);
  background: var(--card);
  padding: 0 16px;
}
.page-about .about-team__item + .about-team__item {
  margin-top: 8px;
}
.page-about .about-team__item summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--paper);
}
.page-about .about-team__item summary::-webkit-details-marker {
  display: none;
}
.page-about .about-team__item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--lime);
}
.page-about .about-team__item[open] summary::after {
  content: "−";
}
.page-about .about-team__item summary .num {
  min-width: 2ch;
  font-family: var(--font-mono);
  font-size: 1.0625rem;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}
.page-about .about-team__item > p {
  margin: 0 0 16px;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  max-width: none;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 数据链路步骤 ---------- */
.page-about .about-steps {
  position: relative;
  display: grid;
  gap: 0;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-steps::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 14px;
  bottom: 16px;
  width: 1px;
  background: linear-gradient(to bottom, var(--lime), var(--line) 55%, transparent);
}
.page-about .about-steps__item {
  position: relative;
  padding: 0 0 24px 48px;
}
.page-about .about-steps__item:last-child {
  padding-bottom: 0;
}
.page-about .about-steps__n {
  position: absolute;
  left: 0;
  top: -2px;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--line);
  background: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--lime);
}
.page-about .about-steps__item h3 {
  margin-bottom: 2px;
}
.page-about .about-steps__item p {
  margin-top: 6px;
  font-size: 0.9375rem;
  line-height: 1.75;
  max-width: 34em;
}
.page-about .about-steps__foot {
  margin-top: 24px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  max-width: 40em;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--paper);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  margin-top: 26px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 18px 0 22px;
  background: linear-gradient(180deg, rgba(14, 26, 20, 0.85), transparent 70%);
}
.page-about .about-timeline__rail {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 10px;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .about-timeline__rail::-webkit-scrollbar {
  height: 0;
}
.page-about .about-timeline__node {
  flex: 0 0 auto;
  appearance: none;
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 82px;
  margin: 0;
  padding: 10px 8px 0 0;
  border: 0;
  border-top: 2px solid var(--line);
  background: transparent;
  text-align: left;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-variant-numeric: tabular-nums;
  cursor: pointer;
  transition: color 0.18s var(--ease-out), border-color 0.18s var(--ease-out);
}
.page-about .about-timeline__node span:last-child {
  font-family: var(--font-body);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.page-about .about-timeline__node:hover {
  color: var(--paper);
  border-top-color: var(--steel);
}
.page-about .about-timeline__node.is-active,
.page-about .about-timeline__node[aria-selected="true"] {
  color: var(--lime);
  border-top-color: var(--lime);
}
.page-about .about-timeline__node.is-active span:last-child,
.page-about .about-timeline__node[aria-selected="true"] span:last-child {
  color: var(--paper);
}
.page-about .about-timeline__panel {
  padding-top: 18px;
}
.page-about .about-timeline__panel h3 {
  font-family: var(--font-mono);
  font-size: 1rem;
  letter-spacing: 0.01em;
  color: var(--lime);
}
.page-about .about-timeline__panel p {
  margin-top: 8px;
  font-size: 0.9375rem;
  line-height: 1.75;
  max-width: 32em;
}
.page-about .about-timeline__figure {
  margin-top: 24px;
  max-width: 240px;
}

/* ---------- 合作与认可 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 24px;
  margin-top: 24px;
}
.page-about .about-facts {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 18px;
  border: 1px solid var(--line);
  background: var(--card);
  list-style: none;
}
.page-about .about-facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--muted);
}
.page-about .about-facts li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}
.page-about .about-facts .num {
  display: inline-block;
  min-width: 4.5ch;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--steel);
  font-variant-numeric: tabular-nums;
}

/* ---------- 准则 ---------- */
.page-about .about-rules {
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}
.page-about .about-rules li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-rules__n {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--lime);
  opacity: 0.9;
  font-variant-numeric: tabular-nums;
}
.page-about .about-rules__body p {
  margin-top: 6px;
  font-size: 0.9375rem;
  line-height: 1.75;
  max-width: 34em;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin-bottom: 56px;
  padding: 32px 20px 36px;
  border: 1px solid var(--line);
  background:
    radial-gradient(110% 130% at 0% 0%, rgba(255, 106, 31, 0.13), transparent 58%),
    linear-gradient(140deg, var(--ink-2), var(--ink) 78%);
}
.page-about .about-cta::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 58%;
  height: 2px;
  background: linear-gradient(90deg, var(--lime), var(--orange));
}
.page-about .about-cta h2 {
  margin: 0;
  max-width: 18em;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.35rem, 4.4vw, 2rem);
  line-height: 1.28;
  letter-spacing: -0.02em;
  color: var(--paper);
}
.page-about .about-cta p {
  margin-top: 12px;
  max-width: 34em;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-hero__frame {
    padding: 42px 32px 38px;
  }
}

@media (min-width: 900px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--about-idx) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }
  .page-about .about-index {
    position: sticky;
    top: 40px;
    border-bottom: 0;
    border-top: 1px solid var(--line-soft);
    padding: 16px 0 0;
  }
  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .about-index__list a {
    width: 100%;
    padding: 9px 8px 9px 10px;
    white-space: normal;
  }
  .page-about .about-flow {
    padding-top: 0;
    gap: 72px;
  }
  .page-about .about-block {
    scroll-margin-top: 44px;
  }
  .page-about .about-team {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 28px;
    align-items: start;
  }
  .page-about .about-team__figure {
    margin-top: 0;
  }
  .page-about .about-timeline__body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 230px;
    gap: 32px;
    align-items: start;
  }
  .page-about .about-timeline__figure {
    margin-top: 18px;
    max-width: none;
  }
  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    gap: 32px;
  }
  .page-about .about-cta {
    padding: 44px 40px 46px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__frame {
    padding: 52px 48px 46px;
  }
  .page-about .about-hero__lede {
    font-size: 1.0625rem;
  }
  .page-about .about-flow {
    gap: 84px;
  }
}
<<<PAGE_CSS_END>>>