.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 22px 0 6px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-graphite);
}

.page-about .about-crumb a {
  color: var(--c-graphite);
  text-decoration: none;
  transition: color .18s var(--ease);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--c-amber);
}

.page-about .about-crumb span[aria-hidden] {
  color: var(--c-line);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 6px 0 8px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 260px;
  background: linear-gradient(180deg, rgba(255, 90, 31, 0) 0%, rgba(255, 90, 31, .07) 100%);
  pointer-events: none;
}

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

.page-about .about-hero__kicker {
  display: inline-block;
  margin: 0 0 18px;
  padding: 6px 16px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .3em;
  color: var(--c-amber);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  max-width: 18ch;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(30px, 6.6vw, 60px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--c-mist);
}

.page-about .about-hero__lede {
  max-width: 60ch;
  margin: 0 0 28px;
  font-family: var(--f-body);
  font-size: 17px;
  line-height: 1.78;
  color: var(--c-graphite);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 36px;
}

.page-about .about-hero__figure {
  margin: 0;
  border-top: 3px solid transparent;
  border-image: linear-gradient(90deg, var(--c-lava), var(--c-amber) 42%, var(--c-cold)) 1;
}

/* ---------- 章节骨架 ---------- */

.page-about .about-sec {
  position: relative;
  padding: 52px 0;
  border-top: 1px solid var(--c-line);
}

.page-about .about-sec--last {
  padding-bottom: 88px;
}

.page-about .about-sec__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-sec__num {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: rgba(255, 176, 32, .45);
}

.page-about .about-sec__main h2 {
  margin: 0 0 20px;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(23px, 3.6vw, 34px);
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--c-mist);
}

.page-about .about-sec__main p {
  max-width: 68ch;
  margin: 0 0 18px;
  font-family: var(--f-body);
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--c-graphite);
}

.page-about .about-sec__main h3 {
  font-family: var(--f-display);
  font-weight: 800;
  color: var(--c-mist);
}

.page-about .about-sec__tail {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px dashed var(--c-line);
}

.page-about .about-sec__tail a {
  color: var(--c-amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 176, 32, .4);
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .about-sec__tail a:hover,
.page-about .about-sec__tail a:focus-visible {
  color: var(--c-amber-soft);
  border-color: var(--c-amber-soft);
}

/* ---------- 引用块 ---------- */

.page-about .about-quote {
  margin: 30px 0 0;
  padding: 24px 26px;
  background: var(--c-deep);
  border-left: 4px solid var(--c-lava);
  border-radius: 0 var(--r-lg) var(--r-lg) 0;
}

.page-about .about-quote p {
  margin: 0;
  max-width: 60ch;
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.76;
  color: var(--c-mist);
}

/* ---------- 四类内容 ---------- */

.page-about .about-scenes {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-scene {
  position: relative;
  padding: 24px 24px 26px;
  background: var(--c-deep);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-scene:hover {
  border-color: rgba(255, 176, 32, .55);
}

.page-about .about-scene__tag {
  display: inline-block;
  margin: 0 0 14px;
  padding: 4px 13px;
  border-radius: var(--r-pill);
  background: var(--c-amber);
  color: #241705;
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
}

.page-about .about-scene__title {
  margin: 0 0 10px;
  font-size: clamp(18px, 2.2vw, 21px);
  line-height: 1.34;
}

.page-about .about-scene__text {
  margin: 0;
  max-width: 46ch;
  font-family: var(--f-body);
  font-size: 15.5px;
  line-height: 1.76;
  color: var(--c-graphite);
}

/* ---------- 双城对比 ---------- */

.page-about .about-cities {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin: 28px 0 24px;
}

.page-about .about-city {
  position: relative;
  padding: 26px 24px 28px;
  border-radius: var(--r-lg);
  border: 1px solid var(--c-line);
  overflow: hidden;
}

.page-about .about-city--warm {
  background: linear-gradient(155deg, rgba(255, 90, 31, .22) 0%, rgba(255, 176, 32, .1) 46%, var(--c-deep) 100%);
  border-color: rgba(255, 90, 31, .38);
}

.page-about .about-city--cold {
  background: linear-gradient(155deg, rgba(47, 212, 198, .18) 0%, rgba(14, 58, 56, .85) 52%, var(--c-deep) 100%);
  border-color: rgba(47, 212, 198, .34);
}

.page-about .about-city__label {
  margin: 0 0 12px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .3em;
  color: var(--c-graphite);
}

.page-about .about-city__title {
  margin: 0 0 12px;
  font-size: clamp(21px, 2.6vw, 26px);
  line-height: 1.2;
}

.page-about .about-city--warm .about-city__title {
  color: var(--c-amber-soft);
}

.page-about .about-city--cold .about-city__title {
  color: var(--c-cold);
}

.page-about .about-city__text {
  margin: 0 0 16px;
  max-width: 44ch;
  font-family: var(--f-body);
  font-size: 15.5px;
  line-height: 1.76;
  color: var(--c-mist);
}

.page-about .about-city__meta {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid rgba(242, 245, 248, .12);
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-graphite);
}

/* ---------- 赛季节奏 ---------- */

.page-about .about-pace {
  margin-top: 28px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

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

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

.page-about .about-pace__item {
  padding: 18px 20px;
  border-radius: var(--r-md);
  background: var(--c-deep);
  border: 1px solid var(--c-line);
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-pace__item:hover,
.page-about .about-pace__item:focus {
  border-color: rgba(47, 212, 198, .6);
  background: rgba(14, 58, 56, .55);
  outline: none;
}

.page-about .about-pace__item:focus-visible {
  box-shadow: 0 0 0 2px var(--c-amber);
}

.page-about .about-pace__when {
  margin: 0 0 8px;
  font-family: var(--f-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--c-cold);
}

.page-about .about-pace__desc {
  margin: 0;
  font-family: var(--f-body);
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--c-mist);
}

.page-about .about-pace__detail {
  display: block;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-family: var(--f-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-graphite);
  transition: max-height .24s var(--ease), opacity .24s var(--ease), margin-top .24s var(--ease);
}

.page-about .about-pace__item:hover .about-pace__detail,
.page-about .about-pace__item:focus .about-pace__detail {
  max-height: 90px;
  margin-top: 10px;
  opacity: 1;
}

/* ---------- 团队 ---------- */

.page-about .about-team__figure {
  margin: 30px 0 0;
  max-width: 720px;
}

/* ---------- 发展历程 ---------- */

.page-about .about-track {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 32px;
}

.page-about .about-track__year {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 82px;
  padding: 11px 18px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  font-family: var(--f-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--c-mist);
  text-decoration: none;
  transition: background-color .18s var(--ease), border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .about-track__year:hover,
.page-about .about-track__year:focus-visible {
  background: var(--c-lava);
  border-color: var(--c-lava);
  color: #fff;
  box-shadow: var(--sh-warm);
}

.page-about .about-stages {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  border-left: 1px solid var(--c-line);
}

.page-about .about-stage {
  position: relative;
  padding: 0 0 34px;
  scroll-margin-top: 96px;
}

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

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-amber);
  box-shadow: 0 0 0 5px rgba(255, 176, 32, .14);
}

.page-about .about-stage__year {
  margin: 0 0 6px;
  font-family: var(--f-mono);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--c-amber);
}

.page-about .about-stage__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.34;
}

.page-about .about-stage__text {
  margin: 0;
  max-width: 62ch;
  font-family: var(--f-body);
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--c-graphite);
}

/* ---------- 断点 ---------- */

@media (min-width: 720px) {
  .page-about .about-cities {
    grid-template-columns: 1fr 1fr;
    gap: 22px;
  }

  .page-about .about-scenes {
    grid-template-columns: 1fr 1fr;
    gap: 22px;
  }

  .page-about .about-scene:nth-child(2n) {
    transform: translateY(28px);
  }

  .page-about .about-cities + p {
    margin-top: 40px;
  }
}

@media (min-width: 900px) {
  .page-about .about-sec {
    padding: 72px 0;
  }

  .page-about .about-sec__row {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-sec__num {
    position: sticky;
    top: 104px;
    font-size: 42px;
    color: rgba(255, 176, 32, .3);
  }

  .page-about .about-pace {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-team__figure {
    margin-top: 36px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero {
    padding-top: 18px;
  }

  .page-about .about-sec__row {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-sec__num {
    font-size: 52px;
  }
}

@media (hover: none) {
  .page-about .about-pace__detail {
    max-height: none;
    margin-top: 10px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-scene,
  .page-about .about-pace__item,
  .page-about .about-pace__detail,
  .page-about .about-track__year,
  .page-about .about-crumb a,
  .page-about .about-sec__tail a {
    transition: none;
  }

  .page-about .about-scene:nth-child(2n) {
    transform: none;
  }
}