.page-about {
  --about-rail: 240px;
  --about-body: #C3D8E8;
  --about-line: 1px solid var(--c-grid);
  background: var(--c-ice);
  color: var(--c-white);
  font-family: var(--font-body);
  line-height: 1.75;
  padding-bottom: 64px;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .img-frame img {
  display: block;
  width: 100%;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: 22px;
}

.page-about .about-crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--c-muted);
}

.page-about .about-crumbs__list > li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-crumbs__list > li + li::before {
  content: "/";
  color: var(--c-grid);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 32px;
  padding-top: 28px;
  padding-bottom: 48px;
}

.page-about .about-hero__kicker {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-accent);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 7vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.01em;
}

.page-about .about-hero__mark {
  color: var(--c-accent);
  box-shadow: inset 0 -0.16em 0 rgba(255, 107, 26, 0.28);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 54ch;
  font-size: 16px;
  color: var(--about-body);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__stats > li {
  padding-top: 14px;
  border-top: var(--about-line);
  min-width: 0;
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: clamp(22px, 5.4vw, 34px);
  line-height: 1.1;
  color: var(--c-accent);
}

.page-about .about-hero__stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--c-muted);
}

.page-about .about-hero__figure {
  margin: 0;
  border: var(--about-line);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-block {
  display: grid;
  gap: 22px;
  padding-top: 44px;
  padding-bottom: 44px;
  border-top: var(--about-line);
}

.page-about .about-block__head {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  min-width: 0;
}

.page-about .about-block__side {
  margin: 0;
  flex: 0 0 auto;
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-line);
  white-space: nowrap;
}

.page-about .about-block__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 5vw, 38px);
  line-height: 1.2;
}

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

.page-about .about-block__body > p {
  margin: 0 0 16px;
  font-size: 16px;
  color: var(--about-body);
}

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

.page-about .about-block__lead {
  font-size: 17px !important;
  color: var(--c-white) !important;
  padding-left: 14px;
  border-left: 2px solid var(--c-accent);
}

.page-about .about-block__note {
  margin-top: 20px !important;
  padding: 14px 16px;
  border-left: 2px solid var(--c-line);
  background: var(--c-panel);
  font-size: 15px !important;
}

/* ---------- 团队数字 ---------- */
.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0 24px;
  border: var(--about-line);
  background: var(--c-grid);
}

.page-about .team-stat {
  background: var(--c-panel);
  padding: 16px 14px;
  min-width: 0;
}

.page-about .team-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1.1;
  color: var(--c-yellow);
}

.page-about .team-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--c-muted);
}

/* ---------- 四步流程 ---------- */
.page-about .steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .steps__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding-top: 12px;
  border-top: var(--about-line);
}

.page-about .steps__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-accent);
}

.page-about .steps__text {
  font-size: 15px;
  color: var(--about-body);
}

.page-about .about-team__figure {
  margin: 26px 0 0;
  border: var(--about-line);
}

/* ---------- 优惠研究板 ---------- */
.page-about .board {
  display: grid;
  gap: 1px;
  margin: 24px 0 0;
  border: var(--about-line);
  background: var(--c-grid);
}

.page-about .board__col {
  background: var(--c-panel);
  padding: 20px 18px 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.page-about .board__col--summary {
  box-shadow: inset 0 3px 0 var(--c-accent);
}

.page-about .board__col--evidence {
  box-shadow: inset 0 3px 0 var(--c-yellow);
}

.page-about .board__col--apply {
  box-shadow: inset 0 3px 0 var(--c-line);
}

.page-about .board__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-muted);
}

.page-about .board__col h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  color: var(--c-white);
}

.page-about .board__col p {
  margin: 0;
  font-size: 15px;
  color: var(--about-body);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 24px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 12px;
  width: 1px;
  background: var(--c-grid);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 26px;
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-line);
  box-shadow: 0 0 0 3px var(--c-ice);
}

.page-about .timeline__item--start::before {
  background: var(--c-accent);
}

.page-about .timeline__item--version::before {
  background: var(--c-yellow);
}

.page-about .timeline__item--archive::before {
  background: var(--c-red);
}

.page-about .timeline__year {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--c-line);
}

.page-about .timeline__content h3 {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
}

.page-about .timeline__content p {
  margin: 0;
  font-size: 15px;
  color: var(--about-body);
}

/* ---------- 合作生态 ---------- */
.page-about .eco {
  display: grid;
  gap: 20px;
  margin: 24px 0 26px;
}

.page-about .eco__figure {
  margin: 0;
  padding: 12px;
  border: var(--about-line);
  background: var(--c-panel);
}

.page-about .eco__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .eco__links line {
  stroke: var(--c-grid);
  stroke-width: 1;
  stroke-dasharray: 4 4;
}

.page-about .eco__node {
  fill: var(--c-ice);
  stroke: var(--c-grid);
  stroke-width: 1;
}

.page-about .eco__node--core {
  fill: var(--c-accent);
  stroke: var(--c-accent);
}

.page-about .eco__text {
  fill: var(--c-line);
  font-family: var(--font-body);
  font-size: 14px;
  text-anchor: middle;
}

.page-about .eco__text--core {
  fill: #08111C;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
}

.page-about .eco__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-grid);
  border: var(--about-line);
}

.page-about .eco__stats > li {
  background: var(--c-panel);
  padding: 16px 14px;
  min-width: 0;
}

.page-about .eco__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: clamp(22px, 4.6vw, 30px);
  line-height: 1.1;
  color: var(--c-white);
}

.page-about .eco__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-muted);
}

/* ---------- 下一步入口 ---------- */
.page-about .about-next {
  padding-top: 40px;
  border-top: var(--about-line);
}

.page-about .about-next__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1.2;
}

.page-about .about-next__lead {
  margin: 10px 0 22px;
  font-size: 16px;
  color: var(--about-body);
}

.page-about .about-next__links {
  display: grid;
  gap: 12px;
}

.page-about .about-next__card {
  display: grid;
  gap: 4px;
  padding: 18px 16px;
  border: 1px solid var(--c-grid);
  color: inherit;
  text-decoration: none;
  background: transparent;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-next__card-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-accent);
}

.page-about .about-next__card-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
}

.page-about .about-next__card-desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-muted);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--c-accent);
  background: var(--c-panel);
}

.page-about .about-next__card:focus-visible {
  outline: 2px solid var(--c-line);
  outline-offset: 2px;
}

/* ---------- 窄屏微调 ---------- */
@media (max-width: 420px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-block__head {
    flex-direction: column;
    gap: 8px;
  }

  .page-about .about-block__side {
    padding-top: 0;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 860px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 44px;
    align-items: end;
    padding-top: 40px;
    padding-bottom: 64px;
  }

  .page-about .about-block {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 48px;
    padding-top: 60px;
    padding-bottom: 60px;
  }

  .page-about .about-block__head {
    position: sticky;
    top: 96px;
    align-self: start;
    flex-direction: row;
  }

  .page-about .about-block__side {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 0.34em;
    padding-top: 2px;
  }

  .page-about .team-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .eco {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .about-next__links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about .js-reveal,
  .page-about .is-in {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
    animation: none !important;
  }

  .page-about .about-next__card {
    transition: none;
  }
}
<<<END>>>