.page-about {
  --about-note-bg: rgba(16, 46, 73, 0.78);
  --about-sec-accent: var(--accent);
  position: relative;
}

/* ============ 面包屑 ============ */
.page-about .about-crumbs {
  padding-top: clamp(14px, 2vw, 22px);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: clamp(24px, 3.5vw, 44px);
  padding: clamp(26px, 4vw, 52px) 0 clamp(30px, 4.5vw, 62px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(31px, 5.6vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 18ch;
}

.page-about .about-hero__copy .bs-lede {
  margin-top: clamp(14px, 2vw, 22px);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 30px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-left: 13px;
  border-left: 2px solid var(--accent);
}

.page-about .about-hero__facts .bs-num {
  font-family: var(--font-mono);
  font-size: clamp(21px, 2.7vw, 29px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--accent);
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__figure .bs-figure__media {
  overflow: hidden;
  background: var(--stand);
  clip-path: var(--cut);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.page-about .about-hero__figure .bs-figure__caption {
  margin-top: 10px;
}

/* ============ 章节骨架 ============ */
.page-about .about-sec {
  position: relative;
  padding: clamp(30px, 4.2vw, 60px) 0 clamp(30px, 4.2vw, 60px) clamp(18px, 2.8vw, 38px);
}

.page-about .about-sec::before {
  content: "";
  position: absolute;
  left: 0;
  top: clamp(36px, 4.6vw, 66px);
  width: 3px;
  height: clamp(40px, 5vw, 58px);
  background: var(--about-sec-accent);
}

.page-about .about-sec--clay { --about-sec-accent: var(--clay); }
.page-about .about-sec--moss { --about-sec-accent: var(--moss); }
.page-about .about-sec--cyan { --about-sec-accent: var(--cyan); }
.page-about .about-sec--amber { --about-sec-accent: var(--amber); }

.page-about .about-sec__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.5vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--paper);
  max-width: 24ch;
}

.page-about .about-sec__lead {
  margin: clamp(14px, 2vw, 20px) 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--cold);
  max-width: 62ch;
}

.page-about .about-sec__body > p {
  margin: clamp(14px, 2vw, 18px) 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--cold);
  max-width: 66ch;
}

.page-about .about-sec__body > p:first-of-type {
  margin-top: clamp(16px, 2.2vw, 24px);
}

.page-about .about-sec a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(182, 240, 58, 0.42);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .about-sec a:hover,
.page-about .about-sec a:focus-visible {
  border-bottom-color: var(--accent);
  color: var(--paper);
}

/* ============ 两栏骨架 ============ */
.page-about .about-split {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  margin-top: clamp(18px, 2.4vw, 28px);
}

.page-about .about-split > .about-sec__body > p:first-child {
  margin-top: 0;
}

/* ============ 侧注 ============ */
.page-about .about-note {
  padding: clamp(16px, 2vw, 24px);
  background: var(--about-note-bg);
  border-left: 2px solid var(--about-sec-accent);
  clip-path: var(--cut-sm);
}

.page-about .about-note .bs-meta {
  display: block;
  color: var(--about-sec-accent);
}

.page-about .about-note__list {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 11px;
}

.page-about .about-note__list li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--cold);
}

.page-about .about-note__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  background: var(--about-sec-accent);
  transform: rotate(45deg);
}

/* ============ 时间轴 ============ */
.page-about .about-timeline__list {
  position: relative;
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--clay) 0%, var(--moss) 42%, var(--cyan) 72%, var(--neon) 100%);
}

.page-about .about-node {
  position: relative;
  padding-left: clamp(36px, 5vw, 54px);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  width: 15px;
  height: 15px;
  background: var(--deep-2);
  border: 2px solid var(--node-accent, var(--clay));
  transform: rotate(45deg);
  transition: background-color 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .about-node:hover::before,
.page-about .about-node:focus-within::before {
  background: var(--node-accent, var(--clay));
  transform: rotate(45deg) scale(1.18);
}

.page-about .about-node:nth-child(1) { --node-accent: var(--clay); }
.page-about .about-node:nth-child(2) { --node-accent: var(--moss); }
.page-about .about-node:nth-child(3) { --node-accent: var(--cyan); }
.page-about .about-node:nth-child(4) { --node-accent: var(--accent); }

.page-about .about-node__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.3vw, 24px);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--node-accent, var(--clay));
}

.page-about .about-node__title {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-node__text {
  margin: 8px 0 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--cold);
  max-width: 62ch;
}

.page-about .about-timeline__foot {
  margin-top: clamp(26px, 3.4vw, 42px);
  padding: clamp(16px, 2vw, 22px) clamp(18px, 2.4vw, 26px);
  background: rgba(16, 46, 73, 0.62);
  border-left: 2px solid var(--clay);
  clip-path: var(--cut-sm);
}

.page-about .about-timeline__foot p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cold);
  max-width: 70ch;
}

/* ============ 联赛覆盖 ============ */
.page-about .about-coverage__figure {
  margin: 0;
}

.page-about .about-coverage__figure .bs-figure__media {
  overflow: hidden;
  background: var(--deep-2);
  clip-path: var(--cut);
}

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

.page-about .about-coverage__figure .bs-figure__caption {
  margin-top: 10px;
}

.page-about .about-league-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-league-list li {
  padding: 6px 13px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cold);
  background: var(--stand);
  border: 1px solid var(--line-soft);
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .about-league-list li:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(182, 240, 58, 0.08);
}

/* ============ 团队 ============ */
.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-team__figure .bs-figure__media {
  overflow: hidden;
  background: var(--stand);
  clip-path: var(--cut);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

.page-about .about-team__figure .bs-figure__caption {
  margin-top: 10px;
}

.page-about .about-team__list {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .about-team__list li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 3px 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-team__list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-team__list .bs-num {
  grid-row: span 2;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .about-team__list strong {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-team__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--cold);
}

/* ============ 合作生态 ============ */
.page-about .about-partners {
  display: grid;
  gap: 16px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-partner {
  padding: clamp(18px, 2.4vw, 26px);
  border-left: 3px solid var(--moss);
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .about-partner:hover,
.page-about .about-partner:focus-within {
  border-left-color: var(--accent);
  transform: translateX(4px);
}

.page-about .about-partner__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-partner p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--cold);
}

.page-about .about-partners__foot {
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cold);
}

/* ============ 用户场景（米白纸面） ============ */
.page-about .about-users__panel {
  padding: clamp(24px, 3.4vw, 48px);
  clip-path: var(--cut);
}

.page-about .about-users__meta {
  display: block;
  color: var(--clay);
}

.page-about .about-users__title {
  color: var(--deep);
  margin-top: 10px;
}

.page-about .about-users__lead {
  margin: clamp(14px, 2vw, 20px) 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: #253746;
  max-width: 62ch;
}

.page-about .about-users__scenes {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-about .about-users__scenes li {
  padding: 16px 18px;
  background: rgba(8, 25, 43, 0.06);
  border-left: 3px solid var(--deep);
}

.page-about .about-users__scenes .bs-meta {
  display: block;
  color: var(--moss);
}

.page-about .about-users__scenes h3 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--deep);
}

.page-about .about-users__scenes p:last-child {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: #2c3f4e;
}

.page-about .about-users__cta {
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: #2c3f4e;
}

.page-about .about-users__panel a {
  color: #1d5f3e;
  text-decoration: none;
  border-bottom: 1px solid rgba(29, 95, 62, 0.45);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .about-users__panel a:hover,
.page-about .about-users__panel a:focus-visible {
  color: var(--deep);
  border-bottom-color: var(--deep);
}

/* ============ 延伸入口 ============ */
.page-about .about-next__links {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 4px 12px;
  padding: clamp(16px, 2vw, 22px) clamp(16px, 2.2vw, 24px);
  background: rgba(16, 46, 73, 0.5);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--line);
  text-decoration: none;
  clip-path: var(--cut-sm);
  transition: border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-about .about-next__link .bs-num {
  grid-row: span 2;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--rock);
}

.page-about .about-next__link strong {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-next__link > span:last-child {
  font-size: 15px;
  line-height: 1.7;
  color: var(--cold);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--accent);
  border-left-color: var(--accent);
  background: rgba(182, 240, 58, 0.08);
}

.page-about .about-next__link:hover .bs-num,
.page-about .about-next__link:focus-visible .bs-num {
  color: var(--accent);
}

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-users__scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

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

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

  .page-about .about-next__link .bs-num {
    grid-row: auto;
  }
}

@media (min-width: 920px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }

  .page-about .about-hero__figure img {
    aspect-ratio: 2 / 1;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  }

  .page-about .about-team .about-split {
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node::before,
  .page-about .about-partner,
  .page-about .about-next__link,
  .page-about .about-league-list li {
    transition: none;
  }

  .page-about .about-node:hover::before,
  .page-about .about-node:focus-within::before {
    transform: rotate(45deg);
  }

  .page-about .about-partner:hover,
  .page-about .about-partner:focus-within {
    transform: none;
  }
}