.page-about {
  --stage-gap: clamp(26px, 5vw, 52px);
  --about-rail-w: 210px;
  --about-soft: rgba(243, 235, 220, 0.82);
  --about-soft-2: rgba(243, 235, 220, 0.66);
  --about-line: rgba(92, 242, 176, 0.18);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  margin: 18px 0 0;
  font-size: 13px;
  color: var(--moss);
}

.page-about .breadcrumbs a {
  color: var(--moss);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover {
  color: var(--mint);
}

.page-about .breadcrumbs li[aria-current="page"] {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 5vw, 52px) 0 clamp(30px, 6vw, 68px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  align-items: start;
}

.page-about .about-hero__copy h1 {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(30px, 7.4vw, 46px);
  line-height: 1.12;
  letter-spacing: 0.004em;
  color: var(--paper);
  margin: 14px 0 18px;
}

.page-about .about-hero__copy .lede {
  max-width: 58ch;
  color: var(--about-soft);
  font-size: 16px;
  margin: 0;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 24px 0 26px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-hero__facts li {
  background: var(--ink-2);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.page-about .about-hero__facts .mono {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--mint);
}

.page-about .about-hero__facts li span:last-child {
  font-size: 12.5px;
  color: var(--moss);
  letter-spacing: 0.02em;
}

.page-about .about-hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
}

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

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(20px, 4vw, 40px);
  padding-bottom: clamp(44px, 8vw, 88px);
}

/* ---------- 左侧目录 ---------- */
.page-about .about-rail {
  padding: 14px 0;
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  color: var(--moss);
  letter-spacing: 0.14em;
  font-size: 11.5px;
}

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

.page-about .about-rail__list a {
  display: inline-block;
  padding: 7px 12px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  font-size: 13px;
  line-height: 1.35;
  color: var(--about-soft);
  background: rgba(14, 42, 34, 0.5);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  border-color: var(--mint);
  color: var(--mint);
  background: rgba(92, 242, 176, 0.06);
  outline: none;
}

/* ---------- 章节流 ---------- */
.page-about .about-stream {
  display: flex;
  flex-direction: column;
  gap: var(--stage-gap);
  min-width: 0;
}

.page-about .about-stage {
  position: relative;
  padding: clamp(20px, 4vw, 34px);
  background: var(--ink-2);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  transition: border-color 0.35s ease, box-shadow 0.35s ease;
}

.page-about .about-stage.is-current {
  border-color: var(--mint);
  box-shadow: inset 3px 0 0 var(--mint);
}

.page-about .about-stage__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-stage__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 5.6vw, 38px);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--mint);
}

.page-about .about-stage__year {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-stage h2 {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(21px, 4.2vw, 28px);
  line-height: 1.2;
  color: var(--paper);
  margin: 0 0 14px;
}

.page-about .about-stage > p {
  color: var(--about-soft);
  font-size: 15.5px;
  line-height: 1.72;
  margin: 0 0 14px;
  max-width: 68ch;
}

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

.page-about .about-stage .media-frame {
  margin: 20px 0 4px;
}

/* ---------- 球队页 / 资料库注记 ---------- */
.page-about .about-note {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-note li {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 12px;
  align-items: start;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--about-soft);
}

.page-about .about-note .mono {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--amber);
  letter-spacing: 0.06em;
}

.page-about .about-note strong {
  color: var(--paper);
  font-weight: 700;
}

/* ---------- V4 五处变化 ---------- */
.page-about .about-changes {
  list-style: none;
  margin: 18px 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-changes li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
  padding: 14px 16px;
  background: rgba(7, 26, 20, 0.55);
  border-left: 3px solid var(--mint);
  border-radius: var(--radius);
}

.page-about .about-changes .mono {
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1.45;
  color: var(--mint);
}

.page-about .about-changes strong {
  display: block;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--paper);
  margin-bottom: 3px;
}

.page-about .about-changes p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--about-soft-2);
}

/* ---------- 团队数据行 ---------- */
.page-about .about-team {
  margin: 18px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 68px 1fr;
  gap: 16px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-team__row p {
  margin: 0;
  font-size: 15px;
  line-height: 1.62;
  color: var(--about-soft);
}

/* ---------- 服务方式四格 ---------- */
.page-about .about-serve {
  display: grid;
  gap: 10px;
  margin: 18px 0;
}

.page-about .about-serve__item {
  padding: 16px 18px;
  background: rgba(14, 42, 34, 0.72);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--mint);
  border-radius: var(--radius);
}

.page-about .about-serve__item .tag {
  display: inline-block;
  margin: 0 0 8px;
  font-size: 10.5px;
}

.page-about .about-serve__item h3 {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.3;
  color: var(--paper);
  margin: 0 0 6px;
}

.page-about .about-serve__item p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.66;
  color: var(--about-soft-2);
}

/* ---------- CTA 纸色叠层 ---------- */
.page-about .about-cta {
  padding-bottom: clamp(44px, 8vw, 84px);
}

.page-about .about-cta__box {
  background: var(--paper);
  color: var(--print);
  padding: clamp(22px, 4vw, 44px);
  border-radius: var(--radius);
  border: 1px solid rgba(17, 26, 24, 0.12);
  box-shadow: 6px 6px 0 rgba(17, 26, 24, 0.18);
  display: grid;
  gap: 20px;
}

.page-about .about-cta__copy .eyebrow {
  color: var(--ink-2);
  letter-spacing: 0.14em;
  margin: 0;
}

.page-about .about-cta__copy h2 {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(22px, 4.4vw, 30px);
  line-height: 1.22;
  color: var(--print);
  margin: 8px 0 10px;
}

.page-about .about-cta__copy p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.7;
  color: rgba(17, 26, 24, 0.78);
}

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

/* ---------- 桌面端 ---------- */
@media (min-width: 720px) {
  .page-about .about-serve {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-cta__box {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

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

  .page-about .about-body {
    grid-template-columns: minmax(180px, var(--about-rail-w)) minmax(0, 1fr);
    gap: clamp(32px, 4.5vw, 64px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    padding: 4px 0 4px 18px;
    border-top: 0;
    border-bottom: 0;
    border-left: 2px solid var(--about-line);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
  }

  .page-about .about-rail__list a {
    display: block;
    padding: 8px 0 8px 14px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: none;
    color: var(--moss);
    font-size: 13.5px;
    line-height: 1.45;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    border-left-color: var(--mint);
    color: var(--mint);
    background: none;
  }

  .page-about .about-stage {
    padding: clamp(24px, 3.2vw, 40px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage,
  .page-about .about-rail__list a {
    transition: none;
  }
}