.page-about {
  --about-card-bg: var(--ink-800);
  --about-card-bg-strong: var(--ink-700);
  --about-rule: rgba(47, 230, 200, .18);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: clamp(20px, 3vw, 32px);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .breadcrumb a {
  color: var(--cyan-300);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--cyan-500);
}

.page-about .breadcrumb span[aria-current="page"] {
  color: var(--chalk);
}

/* ---------- 开篇 ---------- */

.page-about .about-open {
  padding-top: clamp(18px, 3vw, 30px);
}

.page-about .about-open__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 46px);
  align-items: center;
}

.page-about .about-open__text {
  min-width: 0;
}

.page-about .about-open__text h1 {
  margin: 10px 0 18px;
  font-size: clamp(30px, 5.4vw, 52px);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: .02em;
  color: var(--chalk);
}

.page-about .about-open__text .prose {
  color: var(--mist);
}

.page-about .about-open__text .prose--lead {
  color: var(--chalk);
}

.page-about .about-open__media {
  min-width: 0;
  border: 1px solid var(--about-rule);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-about .media-frame__caption {
  display: block;
  padding: 10px 14px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--mist);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-kpi {
  margin-top: clamp(28px, 4vw, 48px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .stat {
  padding: 16px 18px;
  background: var(--about-card-bg);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--gold-500);
  border-radius: var(--r-md);
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1.1;
  color: var(--gold-500);
  font-variant-numeric: tabular-nums;
}

.page-about .stat__num small {
  font-size: .5em;
  margin-left: 2px;
  color: var(--gold-300);
}

.page-about .stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 通用小标题 ---------- */

.page-about .about-head {
  max-width: 60ch;
  margin-bottom: clamp(22px, 3vw, 36px);
}

.page-about .about-head h2 {
  margin: 8px 0 12px;
  font-size: clamp(24px, 3.3vw, 34px);
  line-height: 1.26;
  letter-spacing: .01em;
  color: var(--chalk);
}

.page-about .about-head .prose {
  color: var(--mist);
}

/* ---------- 成长阶段时间轴 ---------- */

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold-500), rgba(47, 230, 200, .35) 60%, transparent);
}

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

.page-about .about-timeline__item + .about-timeline__item {
  margin-top: 10px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 17px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--gold-500);
}

.page-about .about-stage {
  background: var(--about-card-bg);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  transition: border-color .24s var(--ease), background .24s var(--ease);
}

.page-about .about-stage:hover {
  border-color: var(--about-rule);
}

.page-about .about-stage[open] {
  background: var(--about-card-bg-strong);
  border-color: var(--about-rule);
}

.page-about .about-stage__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  gap: 14px;
  align-items: center;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-stage__head::marker {
  content: "";
}

.page-about .about-stage__head::after {
  content: "+";
  font-family: var(--font-num);
  font-size: 16px;
  line-height: 1;
  color: var(--cyan-500);
}

.page-about .about-stage[open] .about-stage__head::after {
  content: "–";
  color: var(--gold-500);
}

.page-about .about-stage__no {
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: .1em;
  color: var(--gold-500);
}

.page-about .about-stage__name {
  margin: 0;
  font-size: clamp(17px, 2.3vw, 21px);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--chalk);
}

.page-about .about-stage[open] .about-stage__name {
  color: var(--cyan-500);
}

.page-about .about-stage__era {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .about-stage__body {
  padding: 0 18px 20px;
  border-top: 1px solid var(--line-soft);
  margin-top: 2px;
  padding-top: 14px;
}

.page-about .about-stage__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--chalk);
}

/* ---------- 团队分工 ---------- */

.page-about .about-crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-crew__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  background: var(--about-card-bg);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  transition: transform .24s var(--ease), border-color .24s var(--ease);
}

.page-about .about-crew__card:hover {
  transform: translateY(-2px);
  border-color: var(--cyan-500);
}

.page-about .about-crew__no {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--gold-500);
}

.page-about .about-crew__title {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--chalk);
}

.page-about .about-crew__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-crew__out {
  margin: auto 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-soft);
  font-size: 12.5px;
  letter-spacing: .03em;
  color: var(--cyan-300);
  transition: color .24s var(--ease);
}

.page-about .about-crew__card:hover .about-crew__out {
  color: var(--gold-300);
}

/* ---------- 生产流程 ---------- */

.page-about .about-flow__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 38px);
  align-items: center;
}

.page-about .about-flow__lead {
  min-width: 0;
}

.page-about .about-flow__lead h2 {
  margin: 8px 0 12px;
  font-size: clamp(24px, 3.3vw, 34px);
  line-height: 1.26;
  color: var(--chalk);
}

.page-about .about-flow__lead .prose {
  color: var(--mist);
}

.page-about .about-flow__media {
  min-width: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .about-flow {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-flow__item {
  position: relative;
  padding: 20px 16px 18px;
  background: linear-gradient(180deg, rgba(47, 230, 200, .06), transparent 72%);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  transition: border-color .24s var(--ease);
}

.page-about .about-flow__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 16px;
  right: 16px;
  height: 1px;
  background: var(--gold-500);
  opacity: .7;
}

.page-about .about-flow__item:hover {
  border-color: var(--cyan-500);
}

.page-about .about-flow__no {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--gold-500);
}

.page-about .about-flow__item h3 {
  margin: 8px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--chalk);
}

.page-about .about-flow__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */

.page-about .filter-bar {
  margin: 4px 0 22px;
}

.page-about .filter-btn {
  border-radius: var(--r-pill);
  font-size: 13px;
  letter-spacing: .04em;
}

.page-about .about-partners__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-partners__item {
  padding: 20px;
  background: var(--about-card-bg);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}

.page-about .about-partners__item[hidden] {
  display: none;
}

.page-about .about-partners__item:hover {
  transform: translateY(-2px);
  border-color: var(--cyan-500);
}

.page-about .about-partners__tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 10px;
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--cyan-300);
  border: 1px solid var(--about-rule);
  border-radius: var(--r-pill);
}

.page-about .about-partners__item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--chalk);
}

.page-about .about-partners__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 内容标准 ---------- */

.page-about .about-standard__inner {
  padding: clamp(24px, 4vw, 46px);
  background: linear-gradient(158deg, var(--ink-800), var(--ink-900) 72%);
  border: 1px solid var(--about-rule);
  border-radius: var(--r-md);
}

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

.page-about .about-standard__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-standard__item:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .about-standard__no {
  padding-top: 3px;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan-500);
}

.page-about .about-standard__item h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--chalk);
}

.page-about .about-standard__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--mist);
}

/* ---------- 服务区域 ---------- */

.page-about .about-cities {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.page-about .about-city {
  position: relative;
  padding: 12px 12px 12px 28px;
  background: var(--about-card-bg);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-sm);
  transition: border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-city::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 17px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan-500);
  box-shadow: 0 0 0 3px rgba(47, 230, 200, .14);
  transition: background .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .about-city:hover,
.page-about .about-city:focus-visible {
  border-color: var(--gold-500);
  background: var(--about-card-bg-strong);
  outline: none;
}

.page-about .about-city:hover::before,
.page-about .about-city:focus-visible::before {
  background: var(--gold-500);
  box-shadow: 0 0 0 3px rgba(242, 162, 52, .18);
}

.page-about .about-city__name {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--chalk);
}

.page-about .about-city__tip {
  display: block;
  margin-top: 3px;
  font-size: 11.5px;
  letter-spacing: .02em;
  color: var(--mist);
}

.page-about .about-region__note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--gold-500);
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--mist);
}

/* ---------- 收尾 ---------- */

.page-about .about-next__inner {
  padding-top: clamp(24px, 3vw, 38px);
  border-top: 1px solid var(--about-rule);
}

.page-about .about-next__inner h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.3;
  color: var(--chalk);
}

.page-about .about-next__inner .prose {
  color: var(--mist);
}

.page-about .about-next__inner .prose a {
  color: var(--cyan-300);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-next__inner .prose a:hover {
  color: var(--cyan-500);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 560px) {
  .page-about .about-cities {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 640px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .page-about .about-kpi {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-cities {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-timeline {
    padding-left: 34px;
  }

  .page-about .about-timeline::before {
    left: 9px;
  }

  .page-about .about-timeline__item::before {
    left: -30px;
    top: 19px;
  }

  .page-about .about-stage__head {
    padding: 18px 22px;
  }

  .page-about .about-stage__body {
    padding: 16px 22px 22px;
  }
}

@media (min-width: 960px) {
  .page-about .about-open__split {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
  }

  .page-about .about-flow__split {
    grid-template-columns: minmax(0, 1fr) minmax(0, .88fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px;
  }
}

@media (min-width: 1060px) {
  .page-about .about-crew {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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