.page-about {
  display: block;
  background: var(--c-snow);
  color: var(--c-rock);
}

.page-about .section {
  padding-block: clamp(46px, 6.5vw, 92px);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--c-snow);
  border-bottom: var(--line-slate);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -34%;
  width: 58%;
  height: 76%;
  background: var(--c-copper);
  opacity: 0.09;
  transform: rotate(-9deg);
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  position: relative;
  z-index: 1;
  padding-top: clamp(18px, 2.6vw, 30px);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(30px, 5vw, 60px);
  padding-block: clamp(30px, 5vw, 56px) clamp(42px, 6.5vw, 84px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(2.2rem, 6.2vw, 4.4rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--c-indigo);
  max-width: 15em;
}

.page-about .about-hero .lede {
  margin-top: clamp(16px, 2.4vw, 26px);
  max-width: 36em;
  font-size: var(--fs-3);
  line-height: 1.85;
  color: #4a5158;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: clamp(24px, 3.4vw, 40px);
  display: grid;
  gap: 22px;
  background: var(--c-indigo);
  color: var(--c-snow);
  clip-path: polygon(0 7%, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-hero__stats li {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 2px 14px;
  padding-top: 18px;
  border-top: 1px solid rgba(244, 241, 234, 0.22);
}

.page-about .about-hero__stats li:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4.4vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: #ffffff;
}

.page-about .stat-unit {
  font-size: var(--fs-3);
  font-weight: 500;
  color: rgba(244, 241, 234, 0.86);
}

.page-about .stat-note {
  grid-column: 1 / -1;
  margin-top: 6px;
  font-size: var(--fs-2);
  line-height: 1.7;
  color: rgba(244, 241, 234, 0.66);
}

/* ---------- 里程碑 ---------- */
.page-about .about-miles__lede {
  max-width: 36em;
  margin-top: 16px;
  color: #4a5158;
}

.page-about .about-miles__body {
  margin-top: clamp(28px, 4vw, 48px);
  border-top: var(--line-slate);
}

.page-about .about-miles__rail {
  display: flex;
  gap: 18px;
  overflow-x: auto;
  padding: 16px 0;
  border-bottom: var(--line-slate);
  scrollbar-width: thin;
}

.page-about .about-miles__rail a {
  flex: none;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-2);
  letter-spacing: 0.06em;
  text-decoration: none;
  color: var(--c-rock);
  padding: 2px 0;
}

.page-about .about-miles__rail a:hover,
.page-about .about-miles__rail a:focus-visible {
  color: var(--c-clay);
}

.page-about .about-miles__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 8px 0 0;
}

.page-about .about-miles__list::before {
  content: "";
  position: absolute;
  left: 3.5px;
  top: 42px;
  bottom: 46px;
  width: 1px;
  background: var(--c-slate);
}

.page-about .about-mile {
  position: relative;
  padding: 26px 0 26px 30px;
  border-bottom: var(--line-slate);
}

.page-about .about-mile:last-child {
  border-bottom: 0;
  padding-bottom: 8px;
}

.page-about .about-mile::before {
  content: "";
  position: absolute;
  left: 0;
  top: 33px;
  width: 8px;
  height: 8px;
  background: var(--c-copper);
}

.page-about .about-mile__year {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-4);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-clay);
}

.page-about .about-mile__title {
  margin: 8px 0 0;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-indigo);
}

.page-about .about-mile__text {
  margin: 10px 0 0;
  max-width: 40em;
  font-size: var(--fs-3);
  line-height: 1.85;
  color: #4a5158;
}

.page-about .about-miles__figure {
  margin: clamp(30px, 4.5vw, 54px) 0 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(28px, 4.5vw, 52px);
  margin-top: clamp(26px, 3.6vw, 44px);
}

.page-about .about-roles {
  margin: 0;
  border-top: var(--line-slate);
}

.page-about .about-roles__row {
  padding: 24px 0;
  border-bottom: var(--line-slate);
}

.page-about .about-roles__row dt {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  font-weight: 700;
  color: var(--c-indigo);
}

.page-about .about-roles__row dt .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--c-clay);
}

.page-about .about-roles__row dd {
  margin: 10px 0 0;
  max-width: 38em;
  font-size: var(--fs-3);
  line-height: 1.85;
  color: #4a5158;
}

.page-about .about-team__note {
  margin: 26px 0 0;
  padding: 20px 22px;
  background: rgba(79, 93, 66, 0.1);
  border-left: 3px solid var(--c-moss);
  font-size: var(--fs-3);
  line-height: 1.85;
  color: #3d4636;
}

.page-about .about-team__link {
  margin: 22px 0 0;
  font-size: var(--fs-3);
  line-height: 1.85;
  color: #4a5158;
}

.page-about .about-team__link a,
.page-about .about-cert__note a,
.page-about .about-index__item a {
  color: var(--c-clay);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-team__link a:hover,
.page-about .about-cert__note a:hover,
.page-about .about-index__item a:hover {
  color: var(--c-indigo);
}

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

/* ---------- 网点 ---------- */
.page-about .about-net {
  padding-inline: 0;
}

.page-about .about-net__lede {
  max-width: 38em;
  margin-top: 16px;
  color: #4a5158;
}

.page-about .about-net .filter-bar {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-net__canvas {
  margin-top: clamp(26px, 3.6vw, 44px);
  border-top: var(--line-slate);
}

.page-about .about-net__grid {
  display: grid;
}

.page-about .about-net__half + .about-net__half {
  border-top: var(--line-slate);
}

.page-about .about-net__half-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 22px 0 18px;
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
  font-weight: 700;
  color: var(--c-indigo);
}

.page-about .net-intro {
  margin: 0 0 20px;
  max-width: 34em;
  font-size: var(--fs-3);
  line-height: 1.85;
  color: #4a5158;
}

.page-about .about-map {
  margin: 0 0 24px;
  background: rgba(216, 212, 203, 0.42);
}

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

.page-about .about-map__shape {
  fill: rgba(22, 50, 79, 0.08);
  stroke: var(--c-indigo);
  stroke-width: 1.2;
  stroke-linejoin: round;
}

.page-about .about-map__pin {
  fill: var(--c-copper);
}

.page-about .about-map__pin--base {
  fill: var(--c-clay);
}

.page-about .about-map__labels text {
  font-family: var(--font-sans);
  font-size: 10px;
  fill: var(--c-rock);
}

.page-about .about-map__caption {
  padding: 8px 12px 10px;
  border-top: 1px solid rgba(176, 138, 79, 0.4);
}

.page-about .net-list {
  list-style: none;
  margin: 0;
  padding: 0 0 28px;
  border-top: var(--line-slate);
}

.page-about .net-item {
  display: grid;
  gap: 4px;
  padding: 16px 0 16px 16px;
  border-bottom: var(--line-slate);
  border-left: 2px solid transparent;
}

.page-about .net-item:hover {
  border-left-color: var(--c-copper);
}

.page-about .net-item__name {
  font-size: var(--fs-3);
  font-weight: 700;
  color: var(--c-indigo);
}

.page-about .net-item__desc {
  font-size: var(--fs-2);
  line-height: 1.75;
  color: #5b6269;
}

.page-about .net-item.is-hidden,
.page-about .net-list li[hidden] {
  display: none;
}

/* ---------- 响应分级 ---------- */
.page-about .about-sla__lede {
  max-width: 38em;
  margin-top: 16px;
  color: #4a5158;
}

.page-about .about-sla__table {
  margin-top: clamp(26px, 3.6vw, 42px);
  width: 100%;
}

.page-about .about-sla__table th,
.page-about .about-sla__table td {
  text-align: left;
  padding: 16px 12px;
  vertical-align: baseline;
}

.page-about .about-sla__table th[scope="row"] {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  color: var(--c-indigo);
}

.page-about .about-sla__table td.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-3);
  font-weight: 700;
  color: var(--c-clay);
  white-space: nowrap;
}

.page-about .about-sla__note {
  margin: 24px 0 0;
  max-width: 40em;
  font-size: var(--fs-3);
  line-height: 1.85;
  color: #4a5158;
}

/* ---------- 巡检与备件 ---------- */
.page-about .about-upkeep__grid {
  display: grid;
  gap: 0;
  margin-top: clamp(26px, 3.6vw, 44px);
  border-top: var(--line-slate);
}

.page-about .about-upkeep__col {
  padding: clamp(24px, 3.4vw, 38px) 0;
  border-bottom: var(--line-slate);
}

.page-about .about-upkeep__col h3 {
  margin: 0 0 16px;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  font-weight: 700;
  color: var(--c-indigo);
}

.page-about .about-upkeep__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-upkeep__list li {
  position: relative;
  padding-left: 20px;
  font-size: var(--fs-3);
  line-height: 1.85;
  color: #4a5158;
}

.page-about .about-upkeep__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  background: var(--c-copper);
}

/* ---------- 培训与认证 ---------- */
.page-about .about-cert__grid {
  display: grid;
  gap: clamp(28px, 4.5vw, 52px);
  margin-top: clamp(26px, 3.6vw, 44px);
}

.page-about .about-cert__sub {
  margin: 0 0 12px;
  font-size: clamp(1rem, 1.9vw, 1.22rem);
  font-weight: 700;
  color: var(--c-moss);
}

.page-about .about-cert__sub + p {
  margin: 0 0 28px;
  max-width: 40em;
  font-size: var(--fs-3);
  line-height: 1.85;
  color: #4a5158;
}

.page-about .about-cert__list {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-cert__list li {
  position: relative;
  padding-left: 22px;
  font-size: var(--fs-3);
  line-height: 1.85;
  color: #4a5158;
}

.page-about .about-cert__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 10px;
  height: 1px;
  background: var(--c-copper);
}

.page-about .about-cert__note {
  margin: 0;
  font-size: var(--fs-3);
  line-height: 1.85;
  color: #4a5158;
}

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

/* ---------- 底部索引 ---------- */
.page-about .about-index {
  border-top: var(--line-slate);
  background: rgba(216, 212, 203, 0.36);
}

.page-about .about-index__row {
  display: grid;
  gap: 14px;
}

.page-about .about-index__item {
  margin: 0;
  font-size: var(--fs-3);
  line-height: 1.8;
  color: #3f464d;
}

/* ---------- 中屏以上 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .about-hero__stats {
    margin-bottom: 6px;
  }

  .page-about .about-upkeep__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 48px;
  }

  .page-about .about-upkeep__col:last-child {
    border-bottom: 0;
  }

  .page-about .about-index__row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
  }
}

@media (min-width: 900px) {
  .page-about .about-miles__body {
    display: grid;
    grid-template-columns: 116px minmax(0, 1fr);
  }

  .page-about .about-miles__rail {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 28px 20px 28px 0;
    border-bottom: 0;
    border-right: var(--line-slate);
    position: sticky;
    top: 118px;
    align-self: start;
  }

  .page-about .about-miles__rail a {
    padding: 7px 0 7px 14px;
    border-left: 2px solid transparent;
    color: #5b6269;
  }

  .page-about .about-miles__rail a:hover,
  .page-about .about-miles__rail a:focus-visible {
    border-left-color: var(--c-copper);
    color: var(--c-clay);
  }

  .page-about .about-miles__list {
    padding-left: 44px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-cert__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-net__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    column-gap: 0;
  }

  .page-about .about-net__half {
    padding-right: 48px;
  }

  .page-about .about-net__half + .about-net__half {
    border-top: 0;
    border-left: var(--line-slate);
    padding-right: 0;
    padding-left: 48px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-net__half {
    padding-right: 64px;
  }

  .page-about .about-net__half + .about-net__half {
    padding-right: 0;
    padding-left: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero::after {
    transform: none;
  }
}