.page-about {
  --about-track: 132px;
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: 20px;
  padding-bottom: 6px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
}

.page-about .about-hero__media {
  position: relative;
  height: clamp(240px, 40vw, 520px);
  overflow: hidden;
  background: var(--panel-2);
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 42%;
}

.page-about .about-hero__scrim {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(10, 14, 20, .72) 0%, rgba(10, 14, 20, .12) 62%),
    linear-gradient(180deg, rgba(10, 14, 20, .10) 0%, rgba(10, 14, 20, .58) 54%, var(--ink) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  margin-top: clamp(-118px, -9vw, -48px);
  padding-bottom: clamp(32px, 5vw, 64px);
}

.page-about .about-hero__label {
  color: var(--brand);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(2.05rem, 5.6vw, 4rem);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--text);
  max-width: 22ch;
  overflow-wrap: break-word;
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 60ch;
  color: var(--muted);
  font-size: clamp(1rem, 1.5vw, 1.0625rem);
  line-height: 1.75;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(24px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: var(--hair-soft);
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  border-bottom: var(--hair-soft);
}

.page-about .about-fact__num {
  flex: 0 0 auto;
  min-width: 5.5ch;
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1;
  color: var(--brand);
  letter-spacing: -.02em;
}

.page-about .about-fact__num em {
  font-style: normal;
  font-size: .62em;
  margin-left: 2px;
}

.page-about .about-fact__txt {
  color: var(--muted);
  font-size: .9375rem;
  line-height: 1.6;
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 40px);
}

.page-about .about-origin__title {
  margin: 16px 0 0;
  font-size: clamp(1.6rem, 3.4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -.015em;
  color: var(--text);
}

.page-about .about-origin__body p {
  margin: 0 0 18px;
  color: var(--muted);
  line-height: 1.8;
  font-size: 1rem;
}

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

/* ---------- 时间线骨架 ---------- */
.page-about .about-timeline__head {
  padding-top: clamp(24px, 4vw, 48px);
}

.page-about .about-timeline__head .section__head {
  margin-top: 16px;
}

.page-about .year-jump {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  margin-top: clamp(16px, 2.6vw, 28px);
  margin-bottom: clamp(4px, 1.6vw, 18px);
  padding: 14px 0;
  border-top: var(--hair-soft);
  border-bottom: var(--hair-soft);
}

.page-about .year-jump__label {
  color: var(--muted);
}

.page-about .year-jump__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .year-jump__link {
  display: inline-block;
  padding: 5px 12px;
  font-size: .8125rem;
  letter-spacing: .06em;
  color: var(--muted);
  border: var(--hair-soft);
  border-radius: var(--r);
  text-decoration: none;
  transition: color .2s var(--ease), background-color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .year-jump__link:hover,
.page-about .year-jump__link:focus-visible {
  color: var(--on-brand);
  background: var(--brand);
  border-color: var(--brand);
}

/* ---------- 年份节点 ---------- */
.page-about .year-node {
  position: relative;
  padding: clamp(30px, 4.6vw, 60px) 0;
  border-bottom: var(--hair-soft);
  scroll-margin-top: 104px;
}

.page-about .year-node__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .year-node__track {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .year-node__year {
  font-size: clamp(1.7rem, 4.6vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--text);
}

.page-about .year-node__dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 6px rgba(200, 255, 61, .12);
  flex: 0 0 auto;
}

.page-about .year-node__title {
  margin: 0 0 12px;
  font-size: clamp(1.2rem, 2.6vw, 1.65rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .year-node__body p {
  margin: 0;
  max-width: 64ch;
  color: var(--muted);
  line-height: 1.8;
  font-size: .9688rem;
}

/* ---------- 展开字段 ---------- */
.page-about .year-node__details {
  margin-top: 20px;
  background: var(--panel-2);
  border: var(--hair-soft);
  border-radius: var(--r);
}

.page-about .year-node__summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 16px;
  cursor: pointer;
  list-style: none;
  font-size: .875rem;
  font-weight: 600;
  color: var(--brand);
  transition: color .2s var(--ease);
}

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

.page-about .year-node__summary::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: -3px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(-45deg);
  transition: transform .2s var(--ease);
}

.page-about .year-node__details[open] .year-node__summary::before {
  transform: rotate(45deg);
  margin-top: 2px;
}

.page-about .year-node__summary:hover {
  color: var(--brand-dark);
}

.page-about .year-node__fields {
  list-style: none;
  margin: 0;
  padding: 14px 16px 18px;
  border-top: var(--hair-soft);
  display: grid;
  gap: 10px;
}

.page-about .year-node__fields li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  align-items: baseline;
  font-size: .875rem;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .year-node__fields .mono {
  flex: 0 0 auto;
  color: var(--text);
  font-size: .8125rem;
  letter-spacing: .02em;
}

/* ---------- 满宽数据带 ---------- */
.page-about .about-band {
  position: relative;
  padding: clamp(30px, 4.6vw, 56px) 0;
  background: var(--panel);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-band::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--brand);
}

.page-about .about-band__list {
  list-style: none;
  margin: 0;
  padding: 2px 0 8px;
  display: flex;
  gap: clamp(28px, 5vw, 76px);
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-band__item {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 148px;
}

.page-about .about-band__num {
  font-size: clamp(1.75rem, 4vw, 2.9rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--brand);
}

.page-about .about-band__num em {
  font-style: normal;
  font-size: .42em;
  margin-left: 3px;
  letter-spacing: 0;
}

.page-about .about-band__num--alt {
  color: var(--accent);
}

.page-about .about-band__num--teal {
  color: var(--teal);
}

.page-about .about-band__label {
  font-size: .8125rem;
  line-height: 1.55;
  color: var(--muted);
  max-width: 15ch;
}

/* ---------- 时间线中的横向停顿 ---------- */
.page-about .about-break {
  margin: 0;
  padding: 0;
  border-bottom: var(--hair-soft);
}

.page-about .about-break__img {
  display: block;
  width: 100%;
  height: clamp(180px, 28vw, 360px);
  object-fit: cover;
  object-position: center 55%;
}

.page-about .about-break__cap {
  display: block;
  padding: 14px var(--pad);
  max-width: var(--w);
  margin: 0 auto;
  font-size: .8125rem;
  color: var(--muted);
  letter-spacing: .02em;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: clamp(24px, 4vw, 44px);
}

.page-about .team-card {
  position: relative;
  padding: 24px 22px 26px;
  background: var(--panel);
  border: var(--hair-soft);
  border-radius: var(--r);
  transition: transform .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .team-card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--brand), transparent 72%);
  opacity: 0;
  transition: opacity .25s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--line);
  box-shadow: var(--shadow);
}

.page-about .team-card:hover::after,
.page-about .team-card:focus-within::after {
  opacity: 1;
}

.page-about .team-card__idx {
  display: inline-block;
  font-size: .8125rem;
  letter-spacing: .1em;
  color: var(--on-brand);
  background: var(--brand);
  padding: 3px 9px;
  border-radius: var(--r);
}

.page-about .team-card__title {
  margin: 16px 0 10px;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -.005em;
}

.page-about .team-card__desc {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .team-card__relay {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: var(--hair-soft);
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--muted);
  opacity: .72;
  transition: opacity .25s var(--ease), color .25s var(--ease);
}

.page-about .team-card:hover .team-card__relay,
.page-about .team-card:focus-within .team-card__relay {
  opacity: 1;
  color: var(--text);
}

/* ---------- 校验流程 ---------- */
.page-about .about-check {
  padding: clamp(48px, 8vw, 96px) 0;
  background: linear-gradient(180deg, var(--ink) 0%, var(--panel-2) 52%, var(--ink) 100%);
}

.page-about .about-check__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(20px, 3vw, 36px);
}

.page-about .about-check__media {
  position: relative;
  overflow: hidden;
  border: var(--hair-soft);
  border-radius: var(--r);
  order: 2;
}

.page-about .about-check__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 6;
  object-fit: cover;
  filter: saturate(.85) contrast(1.05);
}

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

.page-about .about-check__title {
  margin: 0 0 12px;
  font-size: clamp(1.5rem, 3.2vw, 2.15rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--text);
}

.page-about .about-check__lead {
  margin: 0 0 8px;
  max-width: 58ch;
  color: var(--muted);
  line-height: 1.8;
}

.page-about .check-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .check-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px 16px;
  padding: 20px 0;
  border-bottom: var(--hair-soft);
}

.page-about .check-step:first-child {
  border-top: var(--hair-soft);
  margin-top: 16px;
}

.page-about .check-step__idx {
  padding-top: 3px;
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--brand);
}

.page-about .check-step__title {
  margin: 0 0 6px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .check-step__body p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .check-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-about .partners-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(24px, 4vw, 40px);
  background: var(--grid);
  border: var(--hair-soft);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .partner-block {
  background: var(--ink);
  padding: 28px 24px 30px;
  transition: background-color .25s var(--ease);
}

.page-about .partner-block:hover {
  background: var(--panel);
}

.page-about .partner-block__num {
  display: block;
  font-size: clamp(2rem, 5vw, 3.1rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.035em;
  color: var(--accent);
}

.page-about .partner-block__title {
  margin: 12px 0 10px;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
}

.page-about .partner-block p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 长期合作 ---------- */
.page-about .about-commit {
  padding: clamp(48px, 8vw, 104px) 0 clamp(56px, 9vw, 120px);
  border-top: var(--hair-soft);
}

.page-about .about-commit__inner {
  max-width: 760px;
  margin: 0 auto;
}

.page-about .about-commit__title {
  margin: 16px 0 22px;
  font-size: clamp(1.6rem, 3.4vw, 2.35rem);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -.015em;
  color: var(--text);
}

.page-about .about-commit__inner p {
  margin: 0 0 18px;
  color: var(--muted);
  line-height: 1.9;
  font-size: 1rem;
}

.page-about .about-commit__inner p a {
  color: var(--brand);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, .35);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .about-commit__inner p a:hover,
.page-about .about-commit__inner p a:focus-visible {
  color: var(--brand-dark);
  border-bottom-color: var(--brand-dark);
}

.page-about .about-commit__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 36px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-fact {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 20px 26px 20px 0;
    border-bottom: 0;
    border-right: var(--hair-soft);
  }

  .page-about .about-fact:last-child {
    border-right: 0;
    padding-right: 0;
  }

  .page-about .about-fact__num {
    min-width: 0;
    font-size: 1.75rem;
  }

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

  .page-about .about-band__list {
    overflow-x: visible;
  }
}

@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-origin__aside {
    padding-top: 6px;
  }

  .page-about .year-node__grid {
    grid-template-columns: var(--about-track) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .year-node__track {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .year-node__track::after {
    content: "";
    width: 1px;
    height: clamp(48px, 8vw, 130px);
    margin-left: 5px;
    background: linear-gradient(180deg, var(--line), transparent);
  }

  .page-about .team-card__desc,
  .page-about .team-card__relay {
    max-width: 34ch;
  }

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

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

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

  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: 20px;
  }

  .page-about .team-card:nth-child(2) {
    margin-top: 40px;
  }

  .page-about .team-card:nth-child(3) {
    margin-top: 80px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__inner {
    margin-top: clamp(-130px, -8vw, -70px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .team-card__relay,
  .page-about .year-jump__link,
  .page-about .year-node__summary::before,
  .page-about .partner-block {
    transition: none;
  }

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