.page-about {
  --about-rail: 176px;
  --about-line: 1px;
  background: var(--ink);
  color: var(--mist);
  overflow-x: clip;
}

.page-about [id] {
  scroll-margin-top: 116px;
}

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 20px 0 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
}

.page-about .about-crumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-crumbs li + li::before {
  content: "/";
  color: var(--grid);
}

.page-about .breadcrumbs__item {
  color: var(--graphite);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

.page-about .breadcrumbs__item:hover,
.page-about .breadcrumbs__item[aria-current="page"] {
  color: var(--mist);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 36px;
  padding-top: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(44px, 7vw, 96px);
}

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

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-size: clamp(2.1rem, 7vw, 3.9rem);
  line-height: 1.06;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-about .about-accent {
  color: var(--jade-2);
}

.page-about .about-hero .lede {
  margin-top: 22px;
  max-width: 34em;
  color: var(--mist);
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 26px 44px;
  margin-top: 34px;
  padding-top: 24px;
  border-top: var(--about-line) solid var(--grid);
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 92px;
}

.page-about .stat__value {
  font-family: var(--font-cond);
  font-size: clamp(1.8rem, 5vw, 2.7rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--mist);
}

.page-about .stat--jade .stat__value {
  color: var(--jade-2);
}

.page-about .stat__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--graphite);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border-left: 3px solid var(--gold);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-shell {
  padding-bottom: clamp(52px, 8vw, 120px);
}

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

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 14px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 7px 13px;
  border: var(--about-line) solid var(--grid);
  border-radius: var(--pill);
  color: var(--graphite);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-rail__link::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--grid);
  transition: background 0.25s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link[data-active] {
  color: var(--mist);
  border-color: var(--jade);
}

.page-about .about-rail__link[data-active]::before {
  background: var(--flare);
}

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

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: clamp(44px, 6vw, 88px) 0;
  border-top: var(--about-line) solid var(--grid);
}

.page-about .about-flow > .about-section:first-child {
  border-top: 0;
  padding-top: clamp(20px, 3vw, 36px);
}

.page-about .about-section h2 {
  margin: 14px 0 0;
  max-width: 22em;
  font-size: clamp(1.55rem, 3.8vw, 2.5rem);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .prose {
  margin-top: 22px;
  color: var(--mist);
}

.page-about .prose p {
  margin: 0 0 1.1em;
  max-width: 36em;
  line-height: 1.75;
}

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

.page-about .prose a {
  color: var(--jade-2);
  text-decoration: none;
  border-bottom: var(--about-line) solid var(--jade);
}

.page-about .prose a:hover {
  color: var(--flare);
  border-bottom-color: var(--flare);
}

.page-about .about-intro {
  margin-top: 20px;
  max-width: 36em;
  color: var(--graphite);
  line-height: 1.75;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: var(--about-line);
  background: linear-gradient(180deg, var(--jade) 0%, var(--jade-2) 42%, var(--grid) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 20px 40px;
}

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

.page-about .timeline__summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  padding: 10px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .timeline__summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline__marker {
  position: absolute;
  left: -40px;
  top: 14px;
  width: 18px;
  height: 18px;
  background: var(--gold);
  transition: background 0.25s var(--ease);
}

.page-about .timeline__node[open] .timeline__marker {
  background: var(--flare);
}

.page-about .timeline__year {
  font-family: var(--font-cond);
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .timeline__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--mist);
}

.page-about .timeline__hint {
  position: relative;
  flex: 0 0 auto;
  align-self: center;
  width: 22px;
  height: 22px;
  margin-left: auto;
}

.page-about .timeline__hint::before,
.page-about .timeline__hint::after {
  content: "";
  position: absolute;
  background: var(--jade-2);
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease);
}

.page-about .timeline__hint::before {
  left: 0;
  top: 11px;
  width: 22px;
  height: var(--about-line);
}

.page-about .timeline__hint::after {
  left: 11px;
  top: 0;
  width: var(--about-line);
  height: 22px;
}

.page-about .timeline__node[open] .timeline__hint::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .timeline__body {
  max-width: 36em;
  padding: 2px 0 8px;
  color: var(--graphite);
  line-height: 1.75;
}

.page-about .timeline__body p {
  margin: 0;
}

/* ---------- 团队 ---------- */
.page-about .team-total {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
  margin-top: 30px;
}

.page-about .team-total__num {
  font-family: var(--font-cond);
  font-size: clamp(3.4rem, 13vw, 6.4rem);
  font-weight: 800;
  line-height: 0.88;
  letter-spacing: -0.03em;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
}

.page-about .team-total__unit {
  max-width: 22em;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  line-height: 1.9;
  color: var(--graphite);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-line);
  margin-top: 30px;
  background: var(--grid);
  border: var(--about-line) solid var(--grid);
}

.page-about .team-cell {
  padding: 26px 22px;
  background: var(--ink);
}

.page-about .team-cell__num {
  margin: 0;
  font-family: var(--font-cond);
  font-size: clamp(2.3rem, 6vw, 3.3rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--jade-2);
  font-variant-numeric: tabular-nums;
}

.page-about .team-cell h3 {
  margin: 12px 0 8px;
  font-size: 1.02rem;
  letter-spacing: 0.02em;
}

.page-about .team-cell p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .about-mediaband {
  margin: 34px 0 0;
}

.page-about .about-mediaband img,
.page-about .about-partnermedia img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 协作网络 ---------- */
.page-about .partner-list {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .partner-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 14px 20px;
  padding: 16px 0;
  border-bottom: var(--about-line) solid var(--grid);
}

.page-about .partner-list li:first-child {
  border-top: var(--about-line) solid var(--grid);
}

.page-about .partner-list b {
  font-family: var(--font-cond);
  font-size: 1.55rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .partner-list span {
  max-width: 32em;
  color: var(--mist);
  font-size: 0.96rem;
  line-height: 1.7;
}

.page-about .about-partnermedia {
  margin: 34px 0 0;
}

/* ---------- 认可徽标 ---------- */
.page-about .badge-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-line);
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  background: var(--grid);
  border: var(--about-line) solid var(--grid);
}

.page-about .badge {
  position: relative;
  padding: 26px 22px 24px;
  background: var(--ink);
}

.page-about .badge__mark {
  display: block;
  color: var(--gold);
  opacity: 0.72;
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .badge::after {
  content: "";
  position: absolute;
  right: 16px;
  bottom: 16px;
  width: 20px;
  height: 20px;
  border-right: var(--about-line) solid var(--gold);
  border-bottom: var(--about-line) solid var(--gold);
  opacity: 0;
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
  transform: translate(4px, 4px);
}

.page-about .badge:hover .badge__mark,
.page-about .badge:focus-within .badge__mark {
  opacity: 1;
  color: var(--flare);
  transform: translateY(-2px);
}

.page-about .badge:hover::after,
.page-about .badge:focus-within::after {
  opacity: 1;
  transform: translate(0, 0);
}

.page-about .badge__value {
  margin: 20px 0 0;
  font-family: var(--font-cond);
  font-size: clamp(1.7rem, 4.6vw, 2.3rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--warm);
  font-variant-numeric: tabular-nums;
}

.page-about .badge__label {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  line-height: 1.7;
  color: var(--graphite);
}

/* ---------- 原则 ---------- */
.page-about .principles {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-line);
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  background: var(--grid);
  border: var(--about-line) solid var(--grid);
}

.page-about .principle {
  padding: 24px 22px;
  background: var(--ink);
}

.page-about .principle__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--jade-2);
}

.page-about .principle__title {
  margin: 10px 0 8px;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--mist);
}

.page-about .principle__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--graphite);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  padding-bottom: clamp(56px, 8vw, 112px);
}

.page-about .about-cta__inner {
  padding: clamp(30px, 5vw, 56px) clamp(22px, 4vw, 52px);
  background: var(--ink-2);
  border-left: 3px solid var(--flare);
}

.page-about .about-cta h2 {
  margin: 14px 0 0;
  max-width: 20em;
  font-size: clamp(1.5rem, 3.6vw, 2.3rem);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-cta .lede {
  margin-top: 18px;
  max-width: 38em;
  color: var(--graphite);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .team-grid,
  .page-about .badge-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 1040px) {
  .page-about .about-hero {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: 24px;
    align-items: start;
    padding-top: clamp(40px, 6vw, 88px);
  }

  .page-about .about-hero__lede {
    grid-column: 2 / 8;
  }

  .page-about .about-hero__media {
    grid-column: 9 / 13;
    align-self: end;
  }

  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(36px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 120px;
    padding-top: clamp(22px, 3vw, 36px);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    padding: 0;
    overflow: visible;
  }

  .page-about .about-rail__link {
    padding: 9px 0 9px 16px;
    border: 0;
    border-left: var(--about-line) solid var(--grid);
    border-radius: 0;
    transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link[data-active] {
    border-color: var(--jade-2);
  }

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

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

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

  .page-about .about-partnermedia {
    max-width: 88%;
  }
}

@media (min-width: 1320px) {
  .page-about .about-hero__lede {
    grid-column: 2 / 7;
  }

  .page-about .about-hero__media {
    grid-column: 9 / 12;
  }
}
</final>