.page-about {
  background-color: var(--sand);
  color: var(--ink);
  padding-bottom: clamp(2.5rem, 7vw, 6rem);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: clamp(1rem, 3vw, 1.8rem) 0 0;
  font-size: .8rem;
  letter-spacing: .05em;
  color: var(--ink-2);
}

.page-about .breadcrumb a {
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(1.4rem, 4vw, 2.6rem) 0 clamp(2.2rem, 6vw, 4.2rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
}

.page-about .about-hero__text {
  position: relative;
}

.page-about .about-hero__eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--gold-deep);
  border-bottom: 2px solid var(--gold);
  padding-bottom: .28rem;
  margin: 0;
}

.page-about .about-hero__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(2rem, 6.4vw, 4.1rem);
  line-height: 1.12;
  letter-spacing: .02em;
  margin: 1rem 0 1.3rem;
  color: var(--ink);
}

.page-about .about-hero__lead {
  max-width: 34em;
  margin: 0 0 .9rem;
  font-size: .99rem;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.6rem;
}

.page-about .about-hero__figure {
  position: relative;
  overflow: hidden;
  margin: 0;
}

/* ---------- 图片容器 ---------- */
.page-about .media-frame {
  display: block;
  position: relative;
  overflow: hidden;
  margin: 0;
  background-color: var(--dune);
}

.page-about .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: sepia(.06) saturate(1.02);
}

.page-about .media-frame__caption {
  margin: .75rem 0 0 .85rem;
  padding-left: .75rem;
  border-left: 2px solid var(--gold);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .05em;
  line-height: 1.7;
  color: var(--ink-2);
}

/* ---------- 本页目录 ---------- */
.page-about .about-toc {
  background-color: var(--paper);
  border-top: 1px solid var(--dune);
  border-bottom: 1px solid var(--dune);
}

.page-about .about-toc__inner {
  display: flex;
  flex-direction: column;
  gap: .55rem;
  padding: .95rem 0;
}

.page-about .about-toc__label {
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .22em;
  color: var(--gold-deep);
}

.page-about .about-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem .3rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-toc__list a {
  display: inline-block;
  padding: .3rem .72rem;
  font-size: .83rem;
  color: var(--ink-2);
  text-decoration: none;
  background-color: var(--sand);
  border: 1px solid var(--dune);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--paper);
  background-color: var(--gold-deep);
  border-color: var(--gold-deep);
}

/* ---------- 主张引文 ---------- */
.page-about .about-quote {
  background-color: var(--night);
  color: var(--paper);
  margin: clamp(2rem, 6vw, 3.6rem) 0;
  padding: clamp(2.2rem, 7vw, 4.6rem) 0;
}

.page-about .about-quote__line {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.85rem, 7.4vw, 4.6rem);
  line-height: 1.14;
  letter-spacing: .03em;
  margin: 0 0 1.4rem;
  color: var(--paper);
}

.page-about .about-quote__note {
  max-width: 40em;
  margin: 0;
  padding-left: 1.1rem;
  border-left: 2px solid var(--gold);
  font-size: .96rem;
  line-height: 1.85;
  color: rgba(253, 250, 244, .8);
}

/* ---------- 章节标题 ---------- */
.page-about .about-sechead {
  margin-bottom: clamp(1.4rem, 4vw, 2.4rem);
}

.page-about .about-sechead__eyebrow {
  margin: 0 0 .6rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--gold-deep);
}

.page-about .about-sechead__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.5rem, 3.6vw, 2.3rem);
  line-height: 1.24;
  letter-spacing: .015em;
  margin: 0 0 .8rem;
  max-width: 24ch;
}

.page-about .about-sechead__note {
  max-width: 44ch;
  margin: 0;
  padding-left: 1rem;
  border-left: 1px solid var(--dune);
  font-size: .95rem;
  line-height: 1.85;
  color: var(--ink-2);
}

/* ---------- 区块间距 ---------- */
.page-about .about-lines,
.page-about .about-team,
.page-about .about-rhythm,
.page-about .about-history,
.page-about .about-partners,
.page-about .about-reasons {
  padding: clamp(2.4rem, 7vw, 4.6rem) 0;
  scroll-margin-top: 5.5rem;
}

/* ---------- 三条内容线 ---------- */
.page-about .about-lines__list {
  display: grid;
  border-top: 1px solid var(--dune);
}

.page-about .about-line {
  position: relative;
  display: grid;
  gap: .7rem;
  padding: clamp(1.3rem, 3.5vw, 2rem) 0;
  border-bottom: 1px solid var(--dune);
}

.page-about .about-line::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 0;
  background-color: var(--gold);
  transition: height var(--dur) var(--ease);
}

.page-about .about-line:hover::before,
.page-about .about-line:focus-within::before {
  height: 100%;
}

.page-about .about-line__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .14em;
  color: var(--gold-deep);
}

.page-about .about-line__title {
  font-family: var(--font-serif);
  font-size: 1.32rem;
  line-height: 1.32;
  margin: 0 0 .55rem;
}

.page-about .about-line__body {
  max-width: 38em;
  margin: 0 0 .6rem;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-line__who {
  margin: 0;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--river);
}

.page-about .about-line__link {
  justify-self: start;
  align-self: end;
  font-size: .89rem;
  color: var(--gold-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-line__link:hover,
.page-about .about-line__link:focus-visible {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
}

.page-about .about-team__intro {
  max-width: 40em;
  margin: 0 0 1.4rem;
  font-size: .96rem;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--dune);
}

.page-about .about-team__list > li {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr);
  gap: .25rem .9rem;
  align-items: baseline;
  padding: .95rem 0;
  border-bottom: 1px solid var(--dune);
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 600;
  line-height: 1;
  color: var(--gold-deep);
}

.page-about .about-team__group {
  font-family: var(--font-serif);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-team__desc {
  grid-column: 2;
  font-size: .89rem;
  line-height: 1.75;
  color: var(--ink-2);
}

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

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm__grid {
  display: grid;
  gap: 1px;
  background-color: var(--dune);
  border: 1px solid var(--dune);
}

.page-about .about-rhythm__item {
  background-color: var(--paper);
  padding: clamp(1.2rem, 3.5vw, 1.9rem);
}

.page-about .about-rhythm__cycle {
  margin: 0 0 .85rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--gold-deep);
}

.page-about .about-rhythm__num {
  margin: 0 0 .25rem;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--ink);
}

.page-about .about-rhythm__title {
  font-family: var(--font-serif);
  font-size: 1.04rem;
  margin: 0 0 .55rem;
}

.page-about .about-rhythm__body {
  margin: 0;
  font-size: .89rem;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .about-rhythm__foot {
  margin: 1.5rem 0 0;
  padding-left: 1rem;
  border-left: 2px solid var(--gold);
  max-width: 46em;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--ink-2);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.9rem;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: .3rem;
  top: .6rem;
  bottom: .6rem;
  width: 1px;
  background-color: var(--dune);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(1.5rem, 4vw, 2.3rem);
}

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

.page-about .about-timeline__marker {
  position: absolute;
  left: -1.6rem;
  margin-left: -4px;
  top: .55rem;
  width: 8px;
  height: 8px;
  background-color: var(--sand);
  border: 1px solid var(--gold);
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__marker {
  background-color: var(--gold);
  transform: scale(1.4);
}

.page-about .about-timeline__year {
  margin: 0 0 .3rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .16em;
  color: var(--gold-deep);
}

.page-about .about-timeline__title {
  font-family: var(--font-serif);
  font-size: 1.14rem;
  line-height: 1.35;
  margin: 0 0 .45rem;
}

.page-about .about-timeline__body {
  margin: 0;
  max-width: 42em;
  font-size: .93rem;
  line-height: 1.85;
  color: var(--ink-2);
}

/* ---------- 协作伙伴 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
}

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

.page-about .about-partners__body {
  max-width: 40em;
  margin: 0 0 .9rem;
  font-size: .96rem;
  line-height: 1.85;
  color: var(--ink-2);
}

/* ---------- 选择理由 ---------- */
.page-about .about-reasons__grid {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.5rem);
}

.page-about .about-reason {
  background-color: var(--paper);
  border: 1px solid var(--dune);
  padding: clamp(1.4rem, 3.5vw, 2rem);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-reason:hover,
.page-about .about-reason:focus-within {
  transform: translateY(-3px);
  border-color: var(--gold);
}

.page-about .about-reason__num {
  display: block;
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--gold-deep);
}

.page-about .about-reason__title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  line-height: 1.35;
  margin: 0 0 .65rem;
}

.page-about .about-reason__body {
  margin: 0 0 1rem;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-reason__stat {
  margin: 0;
  padding-top: .85rem;
  border-top: 1px solid var(--dune);
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .04em;
  color: var(--river);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  padding: clamp(1rem, 3vw, 2rem) 0 0;
}

.page-about .about-cta__inner {
  background-color: var(--paper);
  border: 1px solid var(--dune);
  border-top: 3px solid var(--gold);
  padding: clamp(1.6rem, 4.5vw, 2.8rem);
}

.page-about .about-cta__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.4rem, 3.4vw, 2rem);
  line-height: 1.3;
  margin: 0 0 .8rem;
}

.page-about .about-cta__note {
  max-width: 42em;
  margin: 0 0 1.4rem;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-line {
    grid-template-columns: 3.4rem minmax(0, 1fr) auto;
    align-items: start;
    gap: 1.3rem;
    padding-left: 1.1rem;
  }

  .page-about .about-line__num {
    padding-top: .38rem;
  }

  .page-about .about-line__link {
    justify-self: end;
    padding-top: .38rem;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-hero__figure {
    margin-top: 1.6rem;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-team__figure {
    margin-top: 2.4rem;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-partners__figure {
    order: 1;
  }

  .page-about .about-partners__text {
    order: 2;
  }
}

@media (min-width: 820px) {
  .page-about .about-reasons__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-reason--tall {
    padding-bottom: 4.2rem;
  }

  .page-about .about-reason--short {
    padding-bottom: 1.4rem;
  }

  .page-about .about-timeline {
    max-width: 62rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-line::before,
  .page-about .about-reason,
  .page-about .about-timeline__marker,
  .page-about .about-toc__list a,
  .page-about .about-line__link,
  .page-about .breadcrumb a {
    transition: none;
  }

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