.page-about {
  --about-radius: 26px;
  --about-gap: 1.25rem;
  color: var(--ds-ink);
  font-family: var(--ds-sans);
  overflow-x: hidden;
}

.page-about .about-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  margin: 0 0 .9rem;
  font-family: var(--ds-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ds-mid);
}

.page-about .about-eyebrow__mark {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--ds-orange);
  flex: none;
}

.page-about .about-eyebrow--light {
  color: rgba(251, 252, 254, .7);
}

.page-about .about-h2 {
  margin: 0 0 .9rem;
  font-family: var(--ds-serif);
  font-weight: 600;
  font-size: clamp(1.55rem, 4.6vw, 2.4rem);
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--ds-ink);
}

.page-about .about-h3 {
  margin: 0 0 .85rem;
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--ds-ink);
}

.page-about .about-lead {
  margin: 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--ds-mid);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 2rem;
  padding: 1.4rem 0 3rem;
}

.page-about .about-hero__title {
  margin: 0 0 1.1rem;
  font-family: var(--ds-serif);
  font-weight: 600;
  font-size: clamp(2rem, 7vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--ds-ink);
}

.page-about .about-hero__lead {
  margin: 0 0 1.7rem;
  max-width: 46ch;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--ds-mid);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .about-hero__media {
  margin: 0;
  position: relative;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--about-radius) 4px var(--about-radius) 4px;
  border: 1px solid var(--ds-mist);
  object-fit: cover;
  aspect-ratio: 14 / 9;
}

.page-about .about-hero__caption {
  display: flex;
  align-items: center;
  gap: .55rem;
  margin-top: .7rem;
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--ds-mid);
}

.page-about .about-hero__caption .num {
  color: var(--ds-orange);
}

/* ---------- 使命 ---------- */
.page-about .about-mission {
  position: relative;
  margin: 1rem 0 3.5rem;
  padding: 3.25rem 0 3.5rem;
  background: linear-gradient(158deg, var(--ds-blue) 0%, var(--ds-navy) 100%);
  border-radius: var(--about-radius) 0 var(--about-radius) 0;
  overflow: hidden;
}

.page-about .about-mission::before {
  content: "";
  position: absolute;
  width: 340px;
  height: 340px;
  right: -120px;
  top: -140px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 26, .28) 0%, rgba(255, 107, 26, 0) 70%);
  pointer-events: none;
}

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

.page-about .about-mission__head .about-h2 {
  color: var(--ds-paper);
  max-width: 22ch;
}

.page-about .about-mission__lead {
  margin: 0 0 2rem;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(251, 252, 254, .76);
}

.page-about .about-mission__cards {
  display: grid;
  gap: .75rem;
}

.page-about .mission-card {
  padding: 1.1rem 1.15rem;
  background: rgba(251, 252, 254, .06);
  border: 1px solid rgba(220, 230, 247, .22);
  border-radius: 14px;
  transition: background .25s var(--ds-ease), border-color .25s var(--ds-ease);
}

.page-about .mission-card[open] {
  background: rgba(251, 252, 254, .1);
  border-color: rgba(255, 107, 26, .5);
}

.page-about .mission-card__summary {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  list-style: none;
  cursor: pointer;
}

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

.page-about .mission-card__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--ds-mono);
  font-size: 1.05rem;
  color: var(--ds-orange-soft);
}

.page-about .mission-card[open] .mission-card__summary::after {
  content: "−";
}

.page-about .mission-card__num {
  flex: none;
  font-size: .82rem;
  color: var(--ds-orange);
}

.page-about .mission-card__title {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ds-paper);
}

.page-about .mission-card__body {
  margin: .75rem 0 0 2rem;
  font-size: .9375rem;
  line-height: 1.8;
  color: rgba(251, 252, 254, .76);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding: 0 0 3.5rem;
}

.page-about .about-timeline__head {
  margin-bottom: 2rem;
}

.page-about .about-timeline__head--tight {
  margin-bottom: 1.6rem;
}

.page-about .timeline {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 82%;
  gap: 1rem;
  margin: 0;
  padding: 0 0 1rem;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .timeline__item {
  position: relative;
  padding: 1.35rem 0 0;
  border-top: 2px solid var(--ds-mist);
  scroll-snap-align: start;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ds-paper);
  border: 2px solid var(--ds-orange);
}

.page-about .timeline__year {
  display: block;
  margin-bottom: .5rem;
  font-size: 1.35rem;
  letter-spacing: .02em;
  color: var(--ds-blue);
}

.page-about .timeline__title {
  margin: 0 0 .45rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--ds-ink);
}

.page-about .timeline__text {
  margin: 0;
  font-size: .9063rem;
  line-height: 1.75;
  color: var(--ds-mid);
}

.page-about .timeline__media {
  margin: 1.75rem 0 0;
}

.page-about .timeline__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 4px var(--about-radius) 4px var(--about-radius);
  object-fit: cover;
  aspect-ratio: 12 / 5;
}

.page-about .timeline__media figcaption {
  margin-top: .65rem;
  font-size: .78rem;
  color: var(--ds-mid);
}

/* ---------- 服务网络 ---------- */
.page-about .about-network {
  padding: 3.25rem 0;
  background: var(--ds-grey);
  border-top: 1px solid var(--ds-mist);
  border-bottom: 1px solid var(--ds-mist);
}

.page-about .network__head {
  margin-bottom: 2rem;
}

.page-about .network__grid {
  display: grid;
  gap: 1.5rem;
  margin-bottom: 2.25rem;
}

.page-about .network__map {
  background: var(--ds-paper);
  border: 1px solid var(--ds-mist);
  border-radius: 4px var(--about-radius) 4px var(--about-radius);
  padding: .75rem;
}

.page-about .network__map svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .network__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .network-stat {
  padding: 1rem .9rem;
  background: var(--ds-paper);
  border-radius: 12px;
  border-left: 3px solid var(--ds-blue);
}

.page-about .network-stat__num {
  display: block;
  font-size: 1.65rem;
  line-height: 1.1;
  color: var(--ds-blue);
}

.page-about .network-stat__num small {
  font-size: .8rem;
  margin-left: .1rem;
  color: var(--ds-orange);
}

.page-about .network-stat__label {
  display: block;
  margin-top: .35rem;
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--ds-mid);
}

.page-about .network__nodes {
  margin-bottom: 2.25rem;
}

.page-about .network__node-list {
  display: grid;
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .network-node {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .3rem .8rem;
  padding: .7rem .9rem;
  background: var(--ds-paper);
  border-radius: 10px;
  border: 1px solid transparent;
  transition: border-color .25s var(--ds-ease), transform .25s var(--ds-ease);
}

.page-about .network-node:hover {
  border-color: var(--ds-orange-soft);
  transform: translateX(3px);
}

.page-about .network-node__name {
  font-family: var(--ds-mono);
  font-size: .9rem;
  color: var(--ds-blue);
  letter-spacing: .04em;
}

.page-about .network-node__role {
  font-size: .85rem;
  color: var(--ds-mid);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 0;
  padding: 1.5rem 0 0;
  list-style: none;
  border-top: 1px solid var(--ds-mist);
}

.page-about .about-figure__num {
  display: block;
  font-size: 1.5rem;
  line-height: 1.1;
  color: var(--ds-ink);
}

.page-about .about-figure__num small {
  font-size: .78rem;
  margin-left: .15rem;
  color: var(--ds-orange);
}

.page-about .about-figure__label {
  display: block;
  margin-top: .3rem;
  font-size: .8125rem;
  color: var(--ds-mid);
}

/* ---------- 运营标准 ---------- */
.page-about .about-standard {
  padding: 3.5rem 0;
}

.page-about .standard__grid {
  display: grid;
  gap: .85rem;
  margin-bottom: 2.5rem;
}

.page-about .licence-card {
  padding: 1.25rem 1.15rem 1.35rem;
  background: var(--ds-paper);
  border: 1px solid var(--ds-mist);
  border-top: 2px solid var(--ds-blue);
  border-radius: 4px 4px 14px 14px;
  transition: border-top-color .25s var(--ds-ease), background .25s var(--ds-ease);
}

.page-about .licence-card:hover {
  border-top-color: var(--ds-orange);
  background: #fff;
}

.page-about .licence-card__num {
  display: block;
  margin-bottom: .65rem;
  font-size: .8rem;
  color: var(--ds-orange);
}

.page-about .licence-card__title {
  margin: 0 0 .5rem;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--ds-ink);
}

.page-about .licence-card__use {
  margin: 0;
  font-size: .885rem;
  line-height: 1.75;
  color: var(--ds-mid);
}

.page-about .standard__steps {
  padding: 1.5rem 1.15rem;
  background: var(--ds-grey);
  border-radius: 14px;
}

.page-about .step-list {
  display: grid;
  gap: .75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .step-item {
  display: flex;
  gap: .7rem;
  align-items: flex-start;
  padding-bottom: .75rem;
  border-bottom: 1px dashed var(--ds-mist);
}

.page-about .step-item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .step-item__num {
  flex: none;
  font-size: .8rem;
  line-height: 1.9;
  color: var(--ds-orange);
}

.page-about .step-item__text {
  font-size: .9rem;
  line-height: 1.75;
  color: var(--ds-ink);
}

.page-about .standard__note {
  margin: 1.25rem 0 0;
  padding-left: .85rem;
  border-left: 2px solid var(--ds-cyan);
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--ds-mid);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: 0 0 3.5rem;
}

.page-about .about-team__grid {
  display: grid;
  gap: 2rem;
}

.page-about .team__chain {
  display: grid;
  gap: .6rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team__link {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: .2rem .7rem;
  padding: .65rem 0;
  border-bottom: 1px solid var(--ds-grey);
  font-size: .9rem;
  line-height: 1.7;
  color: var(--ds-mid);
}

.page-about .team__link .num {
  grid-row: span 2;
  font-size: .78rem;
  color: var(--ds-orange);
  line-height: 1.9;
}

.page-about .team__link strong {
  font-weight: 600;
  color: var(--ds-ink);
}

.page-about .team__note {
  margin: 1.25rem 0 0;
  font-size: .8125rem;
  color: var(--ds-mid);
}

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

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--about-radius) 4px var(--about-radius) 4px;
  object-fit: cover;
  aspect-ratio: 10 / 7;
}

.page-about .about-team__figure figcaption {
  margin-top: .65rem;
  font-size: .78rem;
  color: var(--ds-mid);
}

/* ---------- 未来 ---------- */
.page-about .about-future {
  padding: 3.25rem 0 3.75rem;
  background: var(--ds-mist);
  border-radius: 0 var(--about-radius) 0 var(--about-radius);
}

.page-about .future__grid {
  display: grid;
  gap: .85rem;
  margin-bottom: 2rem;
}

.page-about .future-card {
  padding: 1.25rem 1.15rem;
  background: var(--ds-paper);
  border-radius: 14px;
  border-bottom: 2px solid var(--ds-blue);
  transition: border-bottom-color .25s var(--ds-ease), transform .25s var(--ds-ease);
}

.page-about .future-card:hover {
  border-bottom-color: var(--ds-orange);
  transform: translateY(-2px);
}

.page-about .future-card__num {
  display: block;
  margin-bottom: .6rem;
  font-size: .8rem;
  color: var(--ds-orange);
}

.page-about .future-card__title {
  margin: 0 0 .45rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--ds-ink);
}

.page-about .future-card__text {
  margin: 0;
  font-size: .885rem;
  line-height: 1.75;
  color: var(--ds-mid);
}

.page-about .about-cta {
  padding: 1.5rem 1.15rem;
  background: var(--ds-navy);
  border-radius: 14px;
}

.page-about .about-cta__title {
  margin: 0 0 1rem;
  font-family: var(--ds-serif);
  font-size: 1.15rem;
  color: var(--ds-paper);
}

.page-about .cta__links {
  display: grid;
  gap: .5rem;
}

.page-about .cta__link {
  display: flex;
  align-items: center;
  gap: .65rem;
  padding: .8rem .9rem;
  border: 1px solid rgba(220, 230, 247, .25);
  border-radius: 9px;
  font-size: .9rem;
  color: var(--ds-paper);
  text-decoration: none;
  transition: background .25s var(--ds-ease), border-color .25s var(--ds-ease);
}

.page-about .cta__link:hover,
.page-about .cta__link:focus-visible {
  background: rgba(255, 107, 26, .16);
  border-color: var(--ds-orange);
}

.page-about .cta__link-num {
  flex: none;
  font-size: .76rem;
  color: var(--ds-orange);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-mission__cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .mission-card__body {
    margin-left: 0;
  }

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

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

  .page-about .about-figures {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    align-items: center;
    gap: 3.5rem;
    padding: 2rem 0 4rem;
  }

  .page-about .about-hero__media {
    align-self: stretch;
  }

  .page-about .about-hero__media img {
    height: 100%;
    aspect-ratio: auto;
    min-height: 380px;
  }

  .page-about .about-mission {
    padding: 4.5rem 0 4.75rem;
    margin: 1.5rem 0 5rem;
  }

  .page-about .about-mission__head {
    max-width: 62ch;
  }

  .page-about .about-timeline {
    padding-bottom: 5rem;
  }

  .page-about .timeline {
    grid-auto-flow: row;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    grid-auto-columns: auto;
    overflow: visible;
    padding-bottom: 0;
    gap: 1.25rem;
  }

  .page-about .timeline__media {
    margin-top: 2.75rem;
  }

  .page-about .about-network {
    padding: 4.5rem 0;
  }

  .page-about .network__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: center;
    gap: 2.5rem;
    margin-bottom: 3rem;
  }

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

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

  .page-about .about-standard {
    padding: 4.5rem 0;
  }

  .page-about .standard__steps {
    padding: 2rem 2rem 2.25rem;
  }

  .page-about .step-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .9rem 2rem;
  }

  .page-about .step-item:nth-last-child(2) {
    border-bottom: 1px dashed var(--ds-mist);
    padding-bottom: .75rem;
  }

  .page-about .about-team {
    padding-bottom: 5rem;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
    gap: 3.5rem;
  }

  .page-about .about-future {
    padding: 4.5rem 0 5rem;
  }

  .page-about .about-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    padding: 1.6rem 1.75rem;
  }

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

  .page-about .cta__links {
    flex: 1 1 auto;
    max-width: 640px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .network-node,
  .page-about .licence-card,
  .page-about .future-card,
  .page-about .cta__link {
    transition: none;
  }
}