.page-about {
  --about-rail: 210px;
  background: var(--sky-abyss);
  color: var(--fog);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .breadcrumbs {
  padding-top: clamp(18px, 3vw, 28px);
}
.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cool);
}
.page-about .breadcrumbs__link {
  color: var(--fog);
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 1px;
  transition: color var(--step-fast) ease, border-color var(--step-fast) ease;
}
.page-about .breadcrumbs__link:hover,
.page-about .breadcrumbs__link:focus-visible {
  color: var(--teal-mist);
  border-color: var(--teal);
}
.page-about .breadcrumbs__sep { color: var(--cool); }
.page-about .breadcrumbs__current { color: var(--orange); }

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: clamp(34px, 6vw, 88px) 0 clamp(48px, 8vw, 116px);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: min(var(--wrap-max), calc(100% - 2 * var(--gutter)));
  height: 1px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, var(--teal) 0 92px, var(--line-soft) 92px 100%);
}
.page-about .about-hero__inner {
  display: grid;
  gap: clamp(16px, 2.6vw, 28px);
  max-width: 62em;
}
.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.2rem, 6vw, 4.2rem);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--fog);
}
.page-about .about-hero__title em {
  display: inline-block;
  font-style: normal;
  color: var(--teal-mist);
  box-shadow: inset 0 -0.16em 0 rgba(31, 165, 160, 0.28);
}
.page-about .about-hero__lead {
  max-width: 34em;
  margin: 0;
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  color: var(--fog);
}
.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
  margin: 6px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-hero__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cool);
}
.page-about .about-hero__facts b {
  font-size: 21px;
  font-weight: 600;
  color: var(--teal-mist);
  font-variant-numeric: tabular-nums;
}

/* 服务面向 */
.page-about .about-services {
  background: var(--paper);
  color: var(--ink-dark);
  padding: clamp(46px, 8vw, 104px) 0;
}
.page-about .about-services .label {
  color: #5a6b8c;
}
.page-about .section__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 3.4vw, 2.3rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  max-width: 22em;
}
.page-about .about-services__list {
  display: grid;
  gap: 20px;
  margin-top: clamp(28px, 4vw, 48px);
}
.page-about .about-services__card {
  padding: 24px 22px 28px;
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid var(--print-line);
  border-top: 3px solid var(--ink-dark);
  transition: transform var(--step-base) ease, box-shadow var(--step-base) ease;
}
.page-about .about-services__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 0 -10px rgba(31, 165, 160, 0.5);
}
.page-about .about-services__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: #8d7f63;
}
.page-about .about-services__name {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-size: 1.28rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink-dark);
}
.page-about .about-services__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: #3a4a68;
}

/* 数据链路 */
.page-about .about-chain {
  padding: clamp(50px, 8vw, 112px) 0;
  background: var(--sky-abyss);
}
.page-about .about-chain__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}
.page-about .about-chain__shot {
  margin: 0;
  border: 1px solid var(--line-soft);
  background: var(--sky-card);
}
.page-about .about-chain__shot img,
.page-about .about-chain__diagram img,
.page-about .about-partners__banner img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .media__caption {
  display: block;
  padding: 12px 14px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cool);
  border-top: 1px solid var(--line-soft);
}
.page-about .about-chain__body .prose,
.page-about .about-team .prose,
.page-about .about-partners .prose,
.page-about .about-reach .prose {
  max-width: 34em;
  margin: 14px 0 0;
  color: var(--fog);
}
.page-about .about-chain__list {
  margin-top: 26px;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-chain__item {
  border-top: 1px solid var(--line-soft);
}
.page-about .about-chain__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
}
.page-about .about-chain__summary::-webkit-details-marker { display: none; }
.page-about .about-chain__summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--teal);
  transition: color var(--step-fast) ease;
}
.page-about .about-chain__item[open] .about-chain__summary::after {
  content: "\2013";
  color: var(--orange);
}
.page-about .about-chain__name {
  font-family: var(--font-display);
  font-size: 1.16rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--fog);
}
.page-about .about-chain__hint {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lake-teal, var(--teal));
  border: 1px solid var(--line-strong);
  padding: 3px 8px;
  white-space: nowrap;
}
.page-about .about-chain__detail {
  padding: 0 0 20px;
}
.page-about .about-chain__detail p {
  max-width: 36em;
  margin: 0;
  font-size: 15px;
  color: var(--fog);
}
.page-about .about-chain__note {
  margin: 22px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--orange);
  font-size: 14px;
  color: var(--cool);
}
.page-about .about-chain__diagram {
  margin: clamp(30px, 5vw, 56px) 0 0;
  border: 1px solid var(--line-soft);
  background: var(--sky-panel);
}

/* 团队 */
.page-about .about-team {
  padding: clamp(48px, 7vw, 100px) 0;
  background: var(--sky-panel);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-team__grid {
  display: grid;
  gap: 16px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-team__card {
  position: relative;
  padding: 26px 22px 24px;
  background: var(--sky-card);
  border: 1px solid var(--line-soft);
  outline: none;
  transition: transform var(--step-base) ease, border-color var(--step-base) ease;
}
.page-about .about-team__card:hover,
.page-about .about-team__card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--teal);
}
.page-about .about-team__card:focus-visible {
  box-shadow: 0 0 0 2px var(--teal);
}
.page-about .about-team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 5vw, 3.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--teal-mist);
  font-variant-numeric: tabular-nums;
}
.page-about .about-team__role {
  display: block;
  margin-top: 12px;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--fog);
}
.page-about .about-team__note {
  display: block;
  margin-top: 12px;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 14px;
  color: var(--cool);
  transition: max-height var(--step-base) ease, opacity var(--step-base) ease;
}
.page-about .about-team__card:hover .about-team__note,
.page-about .about-team__card:focus-within .about-team__note,
.page-about .about-team__card:focus-visible .about-team__note {
  max-height: 7em;
  opacity: 1;
}

/* 版本迭代 */
.page-about .about-versions {
  padding: clamp(50px, 8vw, 108px) 0;
  background: var(--sky-abyss);
}
.page-about .about-versions__grid {
  display: grid;
  gap: 26px;
}
.page-about .about-versions__rail {
  position: relative;
}
.page-about .anchor-nav {
  display: flex;
  flex-direction: row;
  gap: 0;
  margin-top: 14px;
  border-bottom: 1px solid var(--line-soft);
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .anchor-nav::-webkit-scrollbar { display: none; }
.page-about .anchor-nav__link {
  display: block;
  padding: 9px 16px 9px 0;
  border-bottom: 2px solid transparent;
  color: var(--cool);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  white-space: nowrap;
  transition: color var(--step-fast) ease, border-color var(--step-fast) ease;
}
.page-about .anchor-nav__link:hover,
.page-about .anchor-nav__link:focus-visible {
  color: var(--teal-mist);
  border-bottom-color: var(--teal-mist);
}
.page-about .anchor-nav__link.is-active {
  color: var(--orange);
  border-bottom-color: var(--orange);
}
.page-about .about-versions__list {
  display: grid;
  gap: 0;
  margin: clamp(22px, 4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-versions__item {
  position: relative;
  padding: 22px 0 26px 24px;
  border-left: 1px solid var(--line-soft);
}
.page-about .about-versions__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 30px;
  width: 7px;
  height: 7px;
  background: var(--sky-abyss);
  border: 2px solid var(--cool);
}
.page-about .about-versions__item:last-child {
  border-left-color: transparent;
  background: linear-gradient(180deg, var(--line-soft) 0 62px, transparent 62px) no-repeat left top / 1px 100%;
}
.page-about .about-versions__tag {
  display: inline-block;
  padding: 3px 9px;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--teal-mist);
}
.page-about .about-versions__name {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.3vw, 1.45rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--fog);
}
.page-about .about-versions__item p {
  max-width: 34em;
  margin: 0;
  font-size: 15px;
  color: var(--fog);
}

/* 本地生态 */
.page-about .about-partners {
  padding: 0 0 clamp(50px, 8vw, 108px);
  background: var(--sky-abyss);
}
.page-about .about-partners__banner {
  margin: 0 0 clamp(-42px, -4vw, -28px);
  border: 1px solid var(--line-soft);
  background: var(--sky-panel);
}
.page-about .about-partners__body {
  position: relative;
  padding: clamp(28px, 4vw, 44px) clamp(20px, 3.4vw, 40px) clamp(26px, 4vw, 40px);
  background: var(--sky-card);
  border: 1px solid var(--line-soft);
  border-top: 3px solid var(--teal);
}
.page-about .about-partners__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 18px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line-soft);
}
.page-about .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}
.page-about .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--cool);
}

/* 联系与收尾 */
.page-about .about-reach {
  padding: clamp(48px, 8vw, 104px) 0 clamp(56px, 9vw, 120px);
  background: var(--sky-panel);
  border-top: 1px solid var(--line-soft);
}
.page-about .about-reach__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}
.page-about .about-reach__cards {
  display: grid;
  gap: 16px;
}
.page-about .about-reach__card {
  background: var(--sky-card);
  border: 1px solid var(--line-soft);
  padding: 22px 20px 24px;
  transition: transform var(--step-base) ease, border-color var(--step-base) ease;
}
.page-about .about-reach__card:hover {
  transform: translateY(-4px);
  border-color: var(--teal-mist);
}
.page-about .about-reach__card .card__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--fog);
}
.page-about .about-reach__card .card__meta {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cool);
}
.page-about .about-reach__card .card__body {
  margin-top: 14px;
}
.page-about .about-reach__card .card__body p {
  margin: 0 0 12px;
  font-size: 14.5px;
  color: var(--fog);
}
.page-about .about-reach__mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--teal-mist) !important;
  word-break: break-all;
}
.page-about .about-reach__link {
  color: var(--teal-mist);
  text-decoration: none;
  border-bottom: 1px solid var(--teal);
  padding-bottom: 1px;
  transition: color var(--step-fast) ease;
}
.page-about .about-reach__link:hover,
.page-about .about-reach__link:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}
.page-about .about-reach__foot {
  max-width: 34em;
  margin: 0;
  font-size: 14px;
  color: var(--cool);
}

/* 响应式 */
@media (min-width: 700px) {
  .page-about .about-services__list {
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
  }
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }
  .page-about .about-team__note {
    max-height: 0;
    opacity: 0;
  }
  .page-about .about-reach__cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-chain__grid {
    grid-template-columns: 5fr 7fr;
    align-items: start;
    gap: clamp(30px, 4vw, 56px);
  }
  .page-about .about-versions__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(34px, 5vw, 72px);
  }
  .page-about .about-versions__rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }
  .page-about .anchor-nav {
    flex-direction: column;
    border-bottom: none;
    border-left: 1px solid var(--line-soft);
    overflow: visible;
  }
  .page-about .anchor-nav__link {
    padding: 11px 0 11px 15px;
    margin-left: -1px;
    border-bottom: none;
    border-left: 2px solid transparent;
  }
  .page-about .anchor-nav__link:hover,
  .page-about .anchor-nav__link:focus-visible {
    border-bottom-color: transparent;
    border-left-color: var(--teal-mist);
  }
  .page-about .anchor-nav__link.is-active {
    border-bottom-color: transparent;
    border-left-color: var(--orange);
  }
  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
    gap: clamp(30px, 5vw, 64px);
  }
  .page-about .about-reach__foot {
    grid-column: 2;
    margin-top: 4px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__inner {
    padding-right: 3em;
  }
}

@media (max-width: 699px) {
  .page-about .about-team__note {
    max-height: none;
    opacity: 1;
  }
  .page-about .about-partners__banner {
    margin-bottom: 0;
  }
  .page-about .about-partners__body {
    border-top-width: 3px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-services__card,
  .page-about .about-team__card,
  .page-about .about-reach__card {
    transition: none;
  }
  .page-about .about-services__card:hover,
  .page-about .about-team__card:hover,
  .page-about .about-reach__card:hover {
    transform: none;
  }
}

.page-about {
  --lake-teal: currentColor;
}