.page-about {
  --about-line: rgba(200, 164, 85, .26);
  --about-line-2: rgba(200, 164, 85, .55);
  --about-rule: rgba(11, 11, 13, .14);
  --about-rule-strong: rgba(11, 11, 13, .26);
  --about-pad: clamp(48px, 9vw, 100px);
}

/* ── 首屏 ────────────────────────────── */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(18px, 4vw, 36px) 0 clamp(44px, 8vw, 88px);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, var(--about-line) 0 1px, transparent 1px 96px);
  opacity: .45;
  pointer-events: none;
}
.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}
.page-about .about-hero h1 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(26px, 6.2vw, 52px);
  line-height: 1.2;
  letter-spacing: -.012em;
  color: var(--paper);
  margin: 12px 0 0;
  max-width: 18em;
}
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 56px);
  margin-top: clamp(18px, 3vw, 30px);
}
.page-about .about-hero__lede {
  margin: 18px 0 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.9;
  color: rgba(242, 234, 217, .8);
  max-width: 40em;
}
.page-about .about-hero__metrics {
  list-style: none;
  margin: 30px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--about-line);
  display: flex;
  flex-wrap: wrap;
  gap: 20px clamp(28px, 5vw, 64px);
}
.page-about .about-hero__metrics li {
  min-width: 0;
}
.page-about .about-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 5vw, 40px);
  line-height: 1.1;
  color: var(--gold);
}
.page-about .about-lab {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--mist);
}
.page-about .about-hero__figure {
  margin: 0;
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--about-line-2);
  object-fit: cover;
}
.page-about .about-hero__figure figcaption {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--gold);
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

/* ── 目录条 ──────────────────────────── */
.page-about .about-toc {
  background: var(--ink-2);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-toc__inner {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-top: 10px;
  padding-bottom: 10px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.page-about .about-toc__inner::-webkit-scrollbar {
  display: none;
}
.page-about .about-toc a {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .07em;
  padding: 8px 14px;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid transparent;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .about-toc a:hover {
  color: var(--gold-lt);
}
.page-about .about-toc a[aria-current] {
  color: var(--gold-lt);
  border-color: var(--about-line-2);
}

/* ── 通用段落节奏 ─────────────────────── */
.page-about .about-teams,
.page-about .about-pipeline,
.page-about .about-timeline,
.page-about .about-partners,
.page-about .about-trust,
.page-about .about-join {
  padding-top: var(--about-pad);
  padding-bottom: var(--about-pad);
}
.page-about h2 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(22px, 4vw, 36px);
  line-height: 1.3;
  letter-spacing: -.008em;
  margin: 10px 0 0;
}
.page-about h3 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.45;
  margin: 12px 0 0;
}
.page-about .about-lead {
  margin: 18px 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  max-width: 42em;
}
.page-about .about-teams h2,
.page-about .about-teams .about-lead,
.page-about .about-timeline h2,
.page-about .about-timeline .about-lead,
.page-about .about-trust h2,
.page-about .about-trust .about-lead {
  color: var(--ink);
}
.page-about .about-pipeline h2,
.page-about .about-pipeline .about-lead,
.page-about .about-partners h2,
.page-about .about-join h2,
.page-about .about-join .about-lead {
  color: var(--paper);
}
.page-about .about-partners .eyebrow,
.page-about .about-join .eyebrow {
  color: var(--gold);
}

/* ── 四个工作组 ───────────────────────── */
.page-about .about-teams__grid {
  display: grid;
  margin-top: clamp(24px, 4vw, 44px);
  border-top: 1px solid var(--about-rule);
}
.page-about .about-team {
  padding: clamp(20px, 3vw, 30px) 0;
  border-bottom: 1px solid var(--about-rule);
  border-left: 2px solid transparent;
  padding-left: 0;
  transition: border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              padding-left var(--dur) var(--ease);
}
.page-about .about-team:hover,
.page-about .about-team:focus-visible {
  border-left-color: var(--gold);
  background-color: var(--paper-2);
  padding-left: 14px;
  outline: none;
}
.page-about .about-team .coord {
  color: var(--jade-d);
}
.page-about .about-team > p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist-dark);
  max-width: 34em;
}
.page-about .about-team ul {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 7px;
}
.page-about .about-team li {
  position: relative;
  padding-left: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-dark);
}
.page-about .about-team li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .58em;
  width: 5px;
  height: 5px;
  background: var(--jade);
  transform: rotate(45deg);
}

/* ── 上线路径 ─────────────────────────── */
.page-about .about-steps {
  list-style: none;
  counter-reset: step;
  margin: clamp(24px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}
.page-about .about-steps li {
  padding-top: 20px;
  border-top: 1px solid var(--about-line);
}
.page-about .about-steps__n {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--gold);
}
.page-about .about-steps h3 {
  color: var(--paper);
}
.page-about .about-steps p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 234, 217, .74);
}
.page-about .about-pipeline__note {
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 16px 18px;
  border-left: 2px solid var(--gold);
  background: var(--ink);
  font-size: 14px;
  line-height: 1.85;
  color: rgba(242, 234, 217, .74);
}

/* ── 年表 ─────────────────────────────── */
.page-about .about-timeline__grid {
  display: grid;
  gap: clamp(26px, 5vw, 56px);
}
.page-about .about-timeline__figure {
  margin: 0;
}
.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-rule-strong);
  background: var(--paper-2);
}
.page-about .about-timeline__figure figcaption {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--jade);
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist-dark);
}
.page-about .about-tl {
  list-style: none;
  margin: clamp(22px, 4vw, 36px) 0 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--about-rule-strong);
}
.page-about .about-tl > li {
  position: relative;
}
.page-about .about-tl > li::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 24px;
  width: 9px;
  height: 9px;
  background: var(--gold);
  transform: rotate(45deg);
}
.page-about .about-tl details {
  border-bottom: 1px solid var(--about-rule);
}
.page-about .about-tl summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  position: relative;
  padding: 16px 30px 16px 0;
  cursor: pointer;
  list-style: none;
}
.page-about .about-tl summary::-webkit-details-marker {
  display: none;
}
.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--cinnabar);
}
.page-about .about-tl__title {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.45;
  color: var(--ink);
}
.page-about .about-tl__sign {
  position: absolute;
  right: 0;
  top: 50%;
  width: 12px;
  height: 12px;
  margin-top: -6px;
}
.page-about .about-tl__sign::before,
.page-about .about-tl__sign::after {
  content: "";
  position: absolute;
  background: var(--gold);
  transition: transform var(--dur) var(--ease);
}
.page-about .about-tl__sign::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 2px;
}
.page-about .about-tl__sign::after {
  left: 5px;
  top: 0;
  width: 2px;
  height: 12px;
}
.page-about .about-tl details[open] .about-tl__sign::after {
  transform: scaleY(0);
}
.page-about .about-tl details > p {
  margin: 0;
  padding: 0 30px 20px 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist-dark);
  max-width: 38em;
}
.page-about .about-timeline__more {
  margin: clamp(22px, 3vw, 32px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist-dark);
}
.page-about .about-timeline__more a {
  color: var(--jade-d);
  text-decoration: none;
  border-bottom: 1px solid var(--jade);
}
.page-about .about-timeline__more a:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

/* ── 协作伙伴 ─────────────────────────── */
.page-about .about-partners__grid {
  display: grid;
  gap: clamp(26px, 5vw, 56px);
  margin-top: clamp(22px, 4vw, 36px);
}
.page-about .about-partners__copy p {
  margin: 0 0 14px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: rgba(242, 234, 217, .78);
  max-width: 40em;
}
.page-about .about-partners__copy p:last-child {
  margin-bottom: 0;
}
.page-about .about-partners__figure {
  margin: 0;
}
.page-about .about-partners__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-line-2);
}
.page-about .about-partners__figure figcaption {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--jade);
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

/* ── 引用保障 ─────────────────────────── */
.page-about .about-trust__grid {
  display: grid;
  margin-top: clamp(22px, 4vw, 38px);
  border-top: 1px solid var(--about-rule);
}
.page-about .about-trust__item {
  padding: clamp(20px, 3vw, 30px) 0;
  border-bottom: 1px solid var(--about-rule);
}
.page-about .about-trust__item h3 {
  margin-top: 0;
  color: var(--ink);
  position: relative;
  padding-left: 16px;
}
.page-about .about-trust__item h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: .5em;
  width: 6px;
  height: 6px;
  background: var(--cinnabar);
  transform: rotate(45deg);
}
.page-about .about-trust__item p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist-dark);
  max-width: 34em;
}

/* ── 加入与合作 ───────────────────────── */
.page-about .about-join__grid {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
  margin-top: clamp(24px, 4vw, 40px);
}
.page-about .about-join__item {
  border-top: 2px solid var(--gold);
  padding-top: 18px;
}
.page-about .about-join__item .coord {
  color: var(--gold);
}
.page-about .about-join__item h3 {
  color: var(--paper);
}
.page-about .about-join__item p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 234, 217, .76);
}
.page-about .about-join__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(28px, 4vw, 44px);
}

/* ── 断点 ─────────────────────────────── */
@media (min-width: 600px) {
  .page-about .about-teams__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 34px);
  }
}

@media (min-width: 760px) {
  .page-about .about-pipeline .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-trust__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-trust__item {
    padding-right: clamp(18px, 3vw, 34px);
  }
  .page-about .about-trust__item + .about-trust__item {
    padding-left: clamp(18px, 3vw, 34px);
    border-left: 1px solid var(--about-rule);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: end;
  }
  .page-about .about-timeline__grid {
    grid-template-columns: minmax(0, 280px) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-timeline__figure {
    position: sticky;
    top: 96px;
  }
  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
  }
}

@media (min-width: 1080px) {
  .page-about .about-teams__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-pipeline .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-join__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team,
  .page-about .about-toc a,
  .page-about .about-tl__sign::before,
  .page-about .about-tl__sign::after {
    transition: none;
  }
  .page-about .about-timeline__figure {
    position: static;
  }
}