.page-about {
  --about-rail: 216px;
  --about-sticky-top: 132px;
  --about-gap: clamp(28px, 4vw, 56px);
  --about-ease: cubic-bezier(.4, 0, .2, 1);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(30px, 5vw, 64px) 0 clamp(24px, 3.5vw, 40px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -80px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(108, 76, 241, .28) 0%, rgba(34, 224, 214, .10) 42%, transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__kicker {
  margin: 0 0 16px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 17em;
  font-size: clamp(28px, 5.2vw, 52px);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 40em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 数据带 ---------- */
.page-about .about-stats {
  padding: clamp(24px, 4vw, 40px) 0;
}

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

.page-about .about-stat {
  background: var(--ink);
  padding: 16px 14px 18px;
  min-width: 0;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(22px, 3.2vw, 32px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--amber);
}

.page-about .about-stat__unit {
  font-size: .54em;
  margin-left: 2px;
  color: var(--cyan);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 首屏通栏图 ---------- */
.page-about .about-banner {
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 8px;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
}

.page-about .about-banner__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.72) brightness(.86);
}

.page-about .about-banner__cap {
  margin: 10px 2px 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 正文两栏 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding: clamp(32px, 5vw, 60px) 0 clamp(48px, 7vw, 96px);
  align-items: start;
}

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

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--muted);
}

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

.page-about .about-index__link {
  display: block;
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  font-size: 13px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  transition: color .24s var(--about-ease), border-color .24s var(--about-ease), background-color .24s var(--about-ease);
}

.page-about .about-index__link:hover {
  color: var(--text);
  border-color: var(--cyan);
}

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

.page-about .about-index__num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--violet);
  margin-right: 7px;
}

/* ---------- 章节 ---------- */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-section {
  padding-top: clamp(32px, 4.6vw, 56px);
  margin-top: clamp(32px, 4.6vw, 56px);
  border-top: 1px solid var(--line);
  scroll-margin-top: var(--about-sticky-top);
}

.page-about .about-section:first-child {
  padding-top: 0;
  margin-top: 0;
  border-top: 0;
}

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  margin-bottom: 20px;
}

.page-about .about-head__num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  line-height: 1.6;
  color: var(--ink);
  background: var(--cream);
  padding: 2px 8px;
  border-radius: 2px;
}

.page-about .about-head__title {
  margin: 0;
  font-size: clamp(20px, 2.7vw, 30px);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-p {
  margin: 0 0 16px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

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

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

/* ---------- 赛事范围 ---------- */
.page-about .about-scope {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-scope__item {
  padding: 18px 16px 20px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--line);
  background: var(--panel);
}

.page-about .about-scope__item--cyan {
  border-top-color: var(--cyan);
}

.page-about .about-scope__item--violet {
  border-top-color: var(--violet);
}

.page-about .about-scope__item--amber {
  border-top-color: var(--amber);
}

.page-about .about-scope__count {
  display: block;
  font-family: var(--mono);
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--text);
}

.page-about .about-scope__name {
  display: block;
  margin-top: 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-scope__desc {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 三条内容线 ---------- */
.page-about .about-tracks-wrap {
  display: grid;
  gap: 18px;
  margin-top: 4px;
}

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

.page-about .about-track {
  padding: 16px 16px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  background: var(--panel);
}

.page-about .about-track--cyan {
  border-left-color: var(--cyan);
}

.page-about .about-track--violet {
  border-left-color: var(--violet);
}

.page-about .about-track--amber {
  border-left-color: var(--amber);
}

.page-about .about-track__meta {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .about-track__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-track__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  padding: 8px;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-figure__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.72) brightness(.86);
}

.page-about .about-figure__cap {
  margin: 10px 2px 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-figure--wide {
  margin-bottom: 24px;
}

/* ---------- 横向数据条 ---------- */
.page-about .about-datastrip {
  display: grid;
  gap: 1px;
  margin-top: clamp(22px, 3.4vw, 34px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-datastrip__item {
  margin: 0;
  padding: 14px 16px;
  background: var(--ink);
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-datastrip__item b {
  display: block;
  margin-bottom: 4px;
  font-family: var(--mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--cyan);
}

/* ---------- 生产流程 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 1px;
  margin: 3px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-flow__step {
  padding: 16px 14px 18px;
  background: var(--panel);
}

.page-about .about-flow__idx {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--violet);
}

.page-about .about-flow__name {
  margin: 9px 0 0;
  font-size: 16px;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-flow__desc {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 12px;
  margin: 4px 0 18px;
}

.page-about .about-team__col {
  padding: 20px 18px 22px;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-team__role {
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--muted);
}

.page-about .about-team__count {
  margin: 10px 0 0;
  font-family: var(--mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .about-team__unit {
  font-size: .44em;
  margin-left: 4px;
  color: var(--muted);
}

.page-about .about-team__name {
  margin: 12px 0 0;
  font-size: 16px;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-team__desc {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  margin: 4px 0 0;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 1px dashed var(--line);
}

.page-about .about-node {
  position: relative;
  padding-bottom: 18px;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -26.5px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px var(--ink);
}

.page-about .about-node__det {
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color .24s var(--about-ease);
}

.page-about .about-node__det[open] {
  border-color: var(--violet);
}

.page-about .about-node__sum {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  padding: 13px 14px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-about .about-node__year {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--amber);
}

.page-about .about-node__title {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text);
}

.page-about .about-node__mark {
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1;
  color: var(--muted);
}

.page-about .about-node__mark::before {
  content: "+";
}

.page-about .about-node__det[open] .about-node__mark::before {
  content: "−";
  color: var(--cyan);
}

.page-about .about-node__body {
  margin: 0;
  padding: 0 14px 15px;
  max-width: 36em;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 合作 ---------- */
.page-about .about-coop {
  display: grid;
  gap: 1px;
  margin: 4px 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-coop__item {
  padding: 18px 16px 20px;
  background: var(--panel);
}

.page-about .about-coop__title {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-coop__desc {
  margin: 9px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(24px, 3.6vw, 36px);
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--violet);
  background:
    linear-gradient(135deg, rgba(108, 76, 241, .16), rgba(34, 224, 214, .07) 60%, transparent),
    var(--panel);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.page-about .about-cta__note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-cta__link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 214, .45);
  transition: border-color .24s var(--about-ease), color .24s var(--about-ease);
}

.page-about .about-cta__link:hover {
  color: var(--text);
  border-bottom-color: var(--text);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

@media (min-width: 820px) {
  .page-about .about-scope {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-team {
    grid-template-columns: 1.15fr .95fr .9fr;
  }
}

@media (min-width: 900px) {
  .page-about .about-tracks-wrap {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: 22px;
    align-items: start;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 68px);
  }

  .page-about .about-index {
    position: sticky;
    top: var(--about-sticky-top);
    padding-right: 8px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-index__link {
    padding: 9px 12px 9px 14px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    font-size: 14px;
    margin-left: -1px;
  }

  .page-about .about-index__link:hover {
    color: var(--text);
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, rgba(34, 224, 214, .12), transparent 72%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-cta__link,
  .page-about .about-node__det {
    transition: none;
  }
}
<<<END>>>