.page-about {
  --about-hair: 1px solid var(--line);
  --about-hair-hard: 2px solid var(--line);
  display: block;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
  margin: 0;
  color: var(--bone);
  letter-spacing: -0.01em;
}

.page-about p {
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 26px 0 62px;
}

.page-about .about-hero__title {
  font-size: clamp(34px, 7.4vw, 58px);
  line-height: 1.07;
  max-width: 19ch;
  margin-top: 14px;
}

.page-about .about-hero__lead {
  margin-top: 20px;
  max-width: 64ch;
  color: var(--stone);
  font-size: 16px;
  line-height: 1.78;
}

.page-about .about-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-strip {
  margin: 44px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--about-hair);
  border-left: var(--about-hair);
}

.page-about .about-strip__cell {
  padding: 18px 14px 20px;
  border-right: var(--about-hair);
  border-bottom: var(--about-hair);
  min-width: 0;
}

.page-about .about-strip__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
  line-height: 1.4;
}

.page-about .about-strip__num {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 36px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-strip__cell--amber .about-strip__num {
  color: var(--amber);
}

.page-about .about-strip__unit {
  font-size: 13px;
  color: var(--stone);
  margin-left: 6px;
  letter-spacing: 0;
}

/* ---------- 发展历程 ---------- */
.page-about .about-history {
  padding: 66px 0 84px;
  border-top: var(--about-hair);
}

.page-about .about-history__head {
  display: grid;
  gap: 28px;
}

.page-about .about-history__intro h2 {
  font-size: clamp(26px, 5.4vw, 40px);
  line-height: 1.18;
  margin-top: 12px;
}

.page-about .about-history__intro p {
  margin-top: 16px;
  color: var(--stone);
  line-height: 1.75;
  max-width: 60ch;
}

.page-about .about-history__figure {
  border: var(--about-hair-hard);
  box-shadow: var(--shadow-hard);
}

.page-about .about-timeline {
  list-style: none;
  margin: 52px 0 0;
  padding: 0 0 0 24px;
  border-left: 2px solid var(--line);
}

.page-about .about-node {
  position: relative;
  padding-bottom: 38px;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 7px;
  width: 14px;
  height: 14px;
  background: var(--ink-950);
  border: 2px solid var(--stone);
  transition: background 0.24s ease, border-color 0.24s ease;
}

.page-about .about-node.is-visible::before,
.page-about .about-node:hover::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-node__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--stone);
  transition: color 0.24s ease;
}

.page-about .about-node.is-visible .about-node__year {
  color: var(--amber);
}

.page-about .about-node__title {
  font-size: clamp(19px, 3.6vw, 24px);
  line-height: 1.3;
  margin-top: 10px;
}

.page-about .about-node__text {
  margin-top: 8px;
  color: var(--stone);
  line-height: 1.72;
  max-width: 62ch;
}

/* ---------- 赛事与数据覆盖（米白分区） ---------- */
.page-about .about-scope {
  background: var(--bone);
  color: var(--ink-800);
  padding: 68px 0 76px;
}

.page-about .about-scope h2,
.page-about .about-scope h3 {
  color: var(--ink-950);
}

.page-about .about-scope .eyebrow {
  color: var(--moss);
}

.page-about .about-scope p {
  color: #3A4A43;
  line-height: 1.75;
}

.page-about .about-scope__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-scope__grid h2 {
  font-size: clamp(24px, 5vw, 36px);
  line-height: 1.2;
  margin-top: 12px;
}

.page-about .about-scope__grid p {
  margin-top: 14px;
  max-width: 62ch;
}

.page-about .about-scope__nums {
  display: flex;
  gap: 40px;
}

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

.page-about .about-scope__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(40px, 9vw, 62px);
  line-height: 1;
  color: var(--ink-950);
}

.page-about .about-scope__numcap {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--moss);
  line-height: 1.5;
}

.page-about .about-sports {
  list-style: none;
  margin: 38px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-sports li {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  padding: 8px 14px;
  border: 2px solid var(--ink-950);
  color: var(--ink-950);
}

.page-about .about-fields {
  display: grid;
  gap: 26px;
  margin-top: 40px;
}

.page-about .about-fields__col {
  border-top: 4px solid var(--ink-950);
  padding-top: 18px;
}

.page-about .about-fields__title {
  font-size: 21px;
  line-height: 1.3;
}

.page-about .about-fields__text {
  margin-top: 10px;
}

.page-about .about-scope__figure {
  margin: 44px 0 0;
  border: 2px solid var(--ink-950);
  box-shadow: 6px 6px 0 rgba(10, 21, 18, 0.35);
}

/* ---------- 团队与服务能力 ---------- */
.page-about .about-team {
  padding: 72px 0 80px;
  background: var(--ink-900);
}

.page-about .about-team h2 {
  font-size: clamp(24px, 5vw, 38px);
  line-height: 1.2;
  margin-top: 12px;
  max-width: 26ch;
}

.page-about .about-team__lead {
  margin-top: 16px;
  color: var(--stone);
  line-height: 1.75;
  max-width: 64ch;
}

.page-about .about-bars {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px 16px;
  align-items: center;
}

.page-about .about-bar__role {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--bone);
}

.page-about .about-bar__num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--amber);
  text-align: right;
  white-space: nowrap;
}

.page-about .about-bar__track {
  grid-column: 1 / -1;
  display: block;
  height: 10px;
  background: var(--moss);
  overflow: hidden;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  background: var(--cyan);
}

.page-about .about-bar--proof .about-bar__fill {
  background: var(--amber);
}

.page-about .about-bar--edit { --w: 46%; }
.page-about .about-bar--proof { --w: 19%; }
.page-about .about-bar--tech { --w: 23%; }
.page-about .about-bar--support { --w: 12%; }

.page-about .about-team__figure {
  margin: 44px 0 0;
  border: var(--about-hair-hard);
  box-shadow: var(--shadow-hard);
}

/* ---------- 使用规模 ---------- */
.page-about .about-scale {
  padding: 76px 0 84px;
  border-top: var(--about-hair);
}

.page-about .about-scale h2 {
  font-size: clamp(24px, 5vw, 38px);
  line-height: 1.2;
  margin-top: 12px;
  max-width: 26ch;
}

.page-about .about-scale__lead {
  margin-top: 16px;
  color: var(--stone);
  line-height: 1.75;
  max-width: 62ch;
}

.page-about .about-scale__list {
  list-style: none;
  margin: 42px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: var(--about-hair);
}

.page-about .about-scale__item {
  background: var(--ink-950);
  padding: 22px 20px 24px;
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-scale__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 6vw, 42px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-scale__sm {
  font-size: 15px;
  color: var(--stone);
  margin-left: 4px;
}

.page-about .about-scale__label {
  font-size: 14px;
  line-height: 1.65;
  color: var(--stone);
}

/* ---------- 合作与认可 ---------- */
.page-about .about-partners {
  padding: 72px 0 80px;
  background: var(--moss);
}

.page-about .about-partners__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-partners h2 {
  font-size: clamp(24px, 5vw, 36px);
  line-height: 1.2;
  margin-top: 12px;
  max-width: 22ch;
}

.page-about .about-partners__text p {
  margin-top: 16px;
  color: var(--stone);
  line-height: 1.75;
  max-width: 60ch;
}

.page-about .about-partners__text .btn {
  margin-top: 24px;
}

.page-about .about-partners__plate {
  background: var(--ink-950);
}

.page-about .about-partners__note {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: 68px 0 88px;
}

.page-about .about-cta__inner {
  border: var(--about-hair-hard);
  box-shadow: var(--shadow-hard);
  background: var(--ink-800);
  padding: 32px 22px 34px;
  display: grid;
  gap: 16px;
  justify-items: start;
}

.page-about .about-cta__inner h2 {
  font-size: clamp(23px, 4.6vw, 34px);
  line-height: 1.2;
  max-width: 24ch;
}

.page-about .about-cta__inner p {
  color: var(--stone);
  line-height: 1.75;
  max-width: 62ch;
}

.page-about .about-cta__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

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

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

  .page-about .about-cta__inner {
    padding: 42px 40px 46px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 40px 0 78px;
  }

  .page-about .about-history {
    padding: 84px 0 104px;
  }

  .page-about .about-history__head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
    align-items: end;
    gap: 56px;
  }

  .page-about .about-node {
    display: grid;
    grid-template-columns: 104px minmax(0, 1fr);
    column-gap: 26px;
    padding-bottom: 46px;
  }

  .page-about .about-node__year {
    grid-row: 1 / span 2;
    grid-column: 1;
    font-size: 32px;
    padding-top: 2px;
  }

  .page-about .about-node__title {
    grid-column: 2;
    margin-top: 0;
  }

  .page-about .about-node__text {
    grid-column: 2;
  }

  .page-about .about-scope {
    padding: 84px 0 92px;
  }

  .page-about .about-scope__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: end;
    gap: 56px;
  }

  .page-about .about-scope__nums {
    justify-content: flex-end;
  }

  .page-about .about-fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 36px;
  }

  .page-about .about-bar {
    grid-template-columns: 148px minmax(0, 1fr) 84px;
    gap: 0 20px;
  }

  .page-about .about-bar__role {
    grid-column: 1;
  }

  .page-about .about-bar__track {
    grid-column: 2;
  }

  .page-about .about-bar__num {
    grid-column: 3;
  }

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

  .page-about .about-scale__item:nth-child(4) {
    grid-column: 1 / span 2;
  }

  .page-about .about-scale__item:nth-child(5) {
    grid-column: 3;
  }

  .page-about .about-team,
  .page-about .about-partners {
    padding: 88px 0 96px;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
    gap: 56px;
  }

  .page-about .about-cta {
    padding: 76px 0 104px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node::before,
  .page-about .about-node__year {
    transition: none;
  }
}