.page-about {
  display: block;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  padding: 22px 0 46px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  padding-top: 24px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 16em;
  color: var(--white);
  font-size: clamp(1.85rem, 4.6vw, 3.3rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
}

.page-about .about-hero .lede {
  margin: 18px 0 0;
  max-width: var(--measure);
  color: var(--mute);
  font-size: 16.5px;
  line-height: 1.78;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--grid);
}

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

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 40px 0 0;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .about-stats__cell {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 17px 18px 19px;
  background: var(--ink);
}

.page-about .about-stats__k {
  margin: 0;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--mute);
}

.page-about .about-stats__v {
  margin: 0;
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.05;
  color: var(--white);
  letter-spacing: 0.02em;
}

.page-about .about-stats__v em {
  margin-left: 5px;
  font-family: var(--sans);
  font-style: normal;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--mute);
}

/* ============ 团队分工 ============ */
.page-about .about-roles__lede {
  margin: 22px 0 0;
  max-width: var(--measure);
  color: var(--mute);
  font-size: 16px;
  line-height: 1.78;
}

.page-about .team-bars {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--grid);
}

.page-about .team-bar {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: 20px 0 22px 0;
  border-bottom: 1px solid var(--grid);
  box-shadow: inset 2px 0 0 transparent;
  transition: box-shadow var(--tick) ease, background var(--tick) ease;
}

.page-about .team-bar:hover,
.page-about .team-bar:focus-within {
  box-shadow: inset 2px 0 0 var(--qing);
  background: var(--panel);
}

.page-about .team-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.page-about .team-bar__name {
  padding-left: 14px;
  color: var(--white);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .team-bar__num {
  padding-right: 14px;
  font-size: 22px;
  font-weight: 600;
  color: var(--gold);
}

.page-about .team-bar__track {
  position: relative;
  height: 10px;
  margin: 0 14px;
  background: var(--panel);
  border: 1px solid var(--grid);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  width: 0;
  background: var(--mint);
}

.page-about .team-bar--a .team-bar__fill { width: 100%; }
.page-about .team-bar--b .team-bar__fill { width: 69%; }
.page-about .team-bar--c .team-bar__fill { width: 38%; }
.page-about .team-bar--d .team-bar__fill { width: 31%; }
.page-about .team-bar--e .team-bar__fill { width: 23%; }

.page-about .team-bar__note {
  margin: 0;
  padding: 0 14px;
  max-width: 40em;
  color: var(--mute);
  font-size: 14.5px;
  line-height: 1.72;
}

/* ============ 四道工序 ============ */
.page-about .about-flow__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 28px;
}

.page-about .flow-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .flow-step {
  display: flex;
  flex-direction: column;
  gap: 11px;
  padding: 22px 20px 24px;
  background: var(--ink);
  box-shadow: inset 0 2px 0 var(--qing);
}

.page-about .flow-step__idx {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mint);
}

.page-about .flow-step__title {
  margin: 0;
  color: var(--white);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .flow-step__text {
  margin: 0;
  color: var(--mute);
  font-size: 14.5px;
  line-height: 1.74;
}

.page-about .about-flow__media {
  margin: 0;
  border: 1px solid var(--grid);
  background: var(--panel);
}

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

.page-about .about-flow__cap {
  padding: 13px 16px;
  border-top: 1px solid var(--grid);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--mute);
}

/* ============ 发展历程 ============ */
.page-about .about-history__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-top: 28px;
}

.page-about .year-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

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

.page-about .year-rail__link {
  display: block;
  padding: 7px 12px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--mute);
  text-decoration: none;
  background: var(--panel);
  border: 1px solid var(--grid);
  transition: color var(--tick) ease, border-color var(--tick) ease;
}

.page-about .year-rail__link:hover,
.page-about .year-rail__link:focus-visible {
  color: var(--qing);
  border-color: var(--qing);
}

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

.page-about .timeline__item {
  padding-bottom: 26px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--grid);
}

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

.page-about .timeline__year {
  display: block;
  margin-bottom: 9px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--mint);
}

.page-about .timeline__title {
  margin: 0 0 9px;
  color: var(--white);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .timeline__text {
  margin: 0;
  max-width: 42em;
  color: var(--mute);
  font-size: 15px;
  line-height: 1.78;
}

/* ============ 青海服务网络 ============ */
.page-about .about-qing__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 28px;
}

.page-about .about-qing__media {
  margin: 0;
  border: 1px solid var(--grid);
  background: var(--panel);
}

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

.page-about .about-qing__body p {
  margin: 0;
  max-width: var(--measure);
  color: var(--mute);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .qing-points {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--grid);
}

.page-about .qing-points li {
  padding: 16px 0 17px;
  border-bottom: 1px solid var(--grid);
  color: var(--mute);
  font-size: 14.5px;
  line-height: 1.76;
}

.page-about .qing-points__k {
  display: block;
  margin-bottom: 6px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--qing);
}

/* ============ 稳定性与运维 ============ */
.page-about .ops-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 28px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .ops-metric {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
  padding: 26px 22px 24px;
  background: var(--panel);
  box-shadow: inset 0 2px 0 var(--mint);
}

.page-about .ops-metric__num {
  font-size: clamp(2.6rem, 8vw, 3.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--mint);
}

.page-about .ops-metric__unit {
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--mute);
}

.page-about .ops-metric__label {
  flex-basis: 100%;
  margin: 12px 0 0;
  max-width: 22em;
  color: var(--mute);
  font-size: 14px;
  line-height: 1.72;
}

.page-about .ops-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--grid);
}

.page-about .ops-item {
  padding: 20px 22px 22px;
  background: var(--ink);
}

.page-about .ops-item__title {
  margin: 0 0 8px;
  color: var(--white);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .ops-item__text {
  margin: 0;
  color: var(--mute);
  font-size: 14.5px;
  line-height: 1.76;
}

/* ============ 合作方式 ============ */
.page-about .coop-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 28px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .coop-card {
  background: var(--ink);
}

.page-about .coop-card__sum {
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 22px 20px;
  cursor: pointer;
  list-style: none;
  color: var(--white);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  transition: color var(--tick) ease, background var(--tick) ease;
}

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

.page-about .coop-card__sum:hover {
  color: var(--qing);
}

.page-about .coop-card__sum:focus-visible {
  outline: 2px solid var(--qing);
  outline-offset: -2px;
}

.page-about .coop-card__idx {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mint);
}

.page-about .coop-card[open] .coop-card__sum {
  color: var(--qing);
}

.page-about .coop-card__body {
  padding: 18px 20px 24px;
  border-top: 1px solid var(--grid);
  color: var(--mute);
  font-size: 14.5px;
  line-height: 1.76;
}

.page-about .coop-card__body p {
  margin: 0 0 14px;
  max-width: 34em;
}

.page-about .coop-card__body ul {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--grid-soft);
}

.page-about .coop-card__body li {
  position: relative;
  padding: 9px 0 9px 16px;
  border-bottom: 1px solid var(--grid-soft);
}

.page-about .coop-card__body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 6px;
  height: 1px;
  background: var(--qing);
}

/* ============ 页尾引导 ============ */
.page-about .about-next__inner {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 26px 0 0;
  border-top: 1px solid var(--grid);
}

.page-about .about-next__line {
  margin: 0;
  max-width: 30em;
  color: var(--white);
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -0.01em;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-next__links .btn {
  text-decoration: none;
}

.page-about .about-next__sub {
  margin: 22px 0 0;
  color: var(--mute);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .about-next__sub a {
  color: var(--qing);
  text-decoration: none;
  border-bottom: 1px solid var(--grid);
  transition: border-color var(--tick) ease;
}

.page-about .about-next__sub a:hover,
.page-about .about-next__sub a:focus-visible {
  border-bottom-color: var(--qing);
}

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 980px) {
  .page-about .about-hero {
    padding-top: 30px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 46px;
    align-items: start;
    padding-top: 34px;
  }

  .page-about .team-bar {
    grid-template-columns: minmax(0, 13em) minmax(0, 1fr) minmax(0, 22em);
    align-items: center;
    gap: 22px;
    padding-left: 14px;
    padding-right: 14px;
  }

  .page-about .team-bar__head {
    justify-content: flex-start;
  }

  .page-about .team-bar__name {
    padding-left: 0;
  }

  .page-about .team-bar__num {
    margin-left: auto;
    padding-right: 0;
  }

  .page-about .team-bar__track {
    margin: 0;
  }

  .page-about .team-bar__note {
    padding: 0;
    font-size: 14px;
  }

  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
    gap: 30px;
    align-items: start;
  }

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

  .page-about .about-history__body {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 46px;
  }

  .page-about .year-rail {
    position: sticky;
    top: calc(var(--head-h) + 26px);
    align-self: start;
  }

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

  .page-about .year-rail__link {
    padding: 10px 0 10px 14px;
    background: transparent;
    border: 0;
    border-left: 1px solid var(--grid);
    font-size: 13px;
  }

  .page-about .year-rail__link:hover,
  .page-about .year-rail__link:focus-visible {
    border-left-color: var(--qing);
    background: var(--panel);
  }

  .page-about .timeline__year {
    display: none;
  }

  .page-about .about-qing__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 38px;
    align-items: start;
  }

  .page-about .ops-split {
    grid-template-columns: minmax(0, 280px) minmax(0, 1fr);
  }

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

  .page-about .about-next__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-bar,
  .page-about .team-bar__fill,
  .page-about .year-rail__link,
  .page-about .coop-card__sum {
    transition: none;
  }
}
</main>