.page-about {
  --about-rail: 214px;
  --about-gap-chapter: clamp(56px, 8vw, 112px);
  --about-line: 2px;
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 顶部与首屏 ---------- */

.page-about .about-topbar {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: calc(var(--gap) * 1.2) var(--gap) 0;
}

.page-about .about-hero {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(26px, 4.6vw, 58px) var(--gap) clamp(22px, 3.4vw, 40px);
}

.page-about .about-hero__title {
  margin: .32em 0 .5em;
  max-width: 15ch;
  font-size: clamp(2.35rem, 6.6vw, 5rem);
  font-weight: 700;
  line-height: .98;
  letter-spacing: -.035em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  max-width: 34em;
  margin: 0;
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.85;
  color: rgba(244, 233, 216, .8);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: var(--about-line) solid var(--line);
}

.page-about .about-stats > li {
  background: var(--ink-2);
  padding: clamp(14px, 2vw, 22px) clamp(14px, 2vw, 24px);
}

.page-about .about-hero__figure {
  max-width: var(--wrap);
  margin: 0 auto clamp(14px, 2vw, 26px);
}

/* ---------- 两栏骨架 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(30px, 4.6vw, 62px) var(--gap) clamp(60px, 8vw, 112px);
  align-items: start;
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: var(--about-gap-chapter);
  min-width: 0;
}

/* ---------- 侧栏目录 ---------- */

.page-about .about-toc__title {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-toc__list {
  display: flex;
  flex-direction: row;
  gap: 2px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  border-bottom: var(--about-line) solid var(--line);
}

.page-about .about-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 11px;
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--mist);
  text-decoration: none;
  border-left: 2px solid transparent;
  background: transparent;
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-toc__num {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--lime);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--paper);
  background: rgba(200, 255, 61, .08);
  border-left-color: var(--lime);
  outline: none;
}

.page-about .about-toc__foot {
  margin: 14px 0 0;
  font-size: 13px;
}

.page-about .about-toc__foot a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, .45);
}

.page-about .about-toc__foot a:hover {
  color: var(--lime-soft);
}

/* ---------- 章节通用 ---------- */

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

.page-about .chapter__head {
  display: block;
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

.page-about .chapter__index {
  display: block;
  margin-bottom: .12em;
  font-family: var(--mono);
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 700;
  line-height: .82;
  letter-spacing: -.05em;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--lime);
}

@supports not ((-webkit-text-stroke: 1px #000)) {
  .page-about .chapter__index {
    color: var(--lime);
  }
}

.page-about .chapter__title {
  max-width: 22em;
  margin: 0;
  font-size: clamp(1.45rem, 3.2vw, 2.15rem);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .prose {
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 233, 216, .8);
}

.page-about .prose p {
  margin: 0 0 1.4em;
}

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

/* ---------- 01 信息链 ---------- */

.page-about .pipeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(24px, 3.2vw, 38px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: var(--about-line) solid var(--line);
}

.page-about .pipeline__item {
  position: relative;
  background: var(--ink-2);
  padding: clamp(18px, 2.4vw, 28px);
  border-top: 3px solid var(--lime);
}

.page-about .pipeline__item:nth-child(1) {
  border-top-color: var(--lime);
}

.page-about .pipeline__item:nth-child(2) {
  border-top-color: var(--amber);
}

.page-about .pipeline__item:nth-child(3) {
  border-top-color: var(--away);
}

.page-about .pipeline__when {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 10px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--ink);
  background: var(--lime);
}

.page-about .pipeline__item:nth-child(2) .pipeline__when {
  background: var(--amber);
}

.page-about .pipeline__item:nth-child(3) .pipeline__when {
  background: var(--away);
}

.page-about .pipeline__title {
  margin: 0 0 .55em;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .pipeline__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 02 团队 ---------- */

.page-about .team-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

.page-about .team-figure {
  margin: 0;
}

/* ---------- 03 时间轴 ---------- */

.page-about .tl {
  --tl-pad: clamp(28px, 4vw, 44px);
  position: relative;
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  padding: 0 0 0 var(--tl-pad);
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 22px;
  width: 3px;
  background: linear-gradient(180deg, var(--lime) 0%, var(--amber) 52%, var(--away) 100%);
}

.page-about .tl__item {
  position: relative;
  padding-bottom: clamp(28px, 4vw, 46px);
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--tl-pad) + 2px);
  top: 6px;
  box-sizing: border-box;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--ink);
  border: 3px solid var(--lime);
}

.page-about .tl__item:nth-child(2)::before {
  border-color: var(--amber);
}

.page-about .tl__item:nth-child(3)::before {
  border-color: var(--away);
}

.page-about .tl__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--lime);
}

.page-about .tl__item:nth-child(2) .tl__year {
  color: var(--amber);
}

.page-about .tl__item:nth-child(3) .tl__year {
  color: var(--away);
}

.page-about .tl__title {
  margin: 0 0 .5em;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .tl__body {
  max-width: 40em;
}

.page-about .tl__lead {
  margin: 0 0 .65em;
  padding-left: 12px;
  border-left: 2px solid var(--line);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 233, 216, .92);
}

.page-about .tl__body p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 04 场馆 ---------- */

.page-about .venues-figure {
  margin: clamp(24px, 3.2vw, 38px) 0 0;
}

/* ---------- 05 会员 ---------- */

.page-about .member-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 3.2vw, 38px);
  background: var(--line);
  border: var(--about-line) solid var(--line);
}

.page-about .mstat {
  background: var(--ink-2);
  padding: clamp(16px, 2.2vw, 26px) clamp(14px, 2vw, 24px);
}

.page-about .mstat__num {
  display: block;
  margin-bottom: .42em;
  font-family: var(--mono);
  font-size: clamp(1.7rem, 4vw, 2.7rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--lime);
}

.page-about .mstat__lab {
  display: block;
  font-size: 13px;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 06 服务标准 ---------- */

.page-about .pledges {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 20px);
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .pledges > li {
  padding: clamp(18px, 2.4vw, 26px);
  background: linear-gradient(158deg, rgba(16, 44, 74, .92), rgba(10, 26, 47, .92));
  border: var(--about-line) solid var(--line);
  border-left: 4px solid var(--lime);
}

.page-about .pledges > li:nth-child(2) {
  border-left-color: var(--amber);
}

.page-about .pledges > li:nth-child(3) {
  border-left-color: var(--away);
}

.page-about .pledges > li:nth-child(4) {
  border-left-color: var(--lime-soft);
}

.page-about .pledges__title {
  margin: 0 0 .5em;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .pledges p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 结尾入口 ---------- */

.page-about .about-cta {
  padding: clamp(24px, 3.6vw, 42px);
  background: var(--ink-2);
  border: var(--about-line) solid var(--shadow);
  box-shadow: var(--hard);
}

.page-about .about-cta__title {
  margin: 0 0 .5em;
  font-size: clamp(1.3rem, 2.8vw, 1.85rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-cta__text {
  max-width: 38em;
  margin: 0 0 clamp(18px, 2.4vw, 28px);
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__links .btn {
  flex: 1 1 auto;
  justify-content: center;
  text-align: center;
}

/* ---------- 动效 ---------- */

.page-about [data-reveal][data-revealed] {
  animation: about-rise .6s var(--ease) both;
}

@keyframes about-rise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal][data-revealed] {
    animation: none;
  }

  .page-about .about-toc__list a {
    transition: none;
  }
}

/* ---------- 图片通用 ---------- */

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

/* ---------- 断点 ---------- */

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

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

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

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

  .page-about .about-cta__links .btn {
    flex: 0 1 auto;
  }
}

@media (min-width: 860px) {
  .page-about .team-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }
}

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

  .page-about .about-toc {
    position: sticky;
    top: 96px;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-about .about-toc__list a {
    white-space: normal;
  }
}