.page-about {
  --about-rail-w: 244px;
  --about-orange-glow: rgba(255, 106, 19, .18);
  --about-line-soft: rgba(31, 122, 90, .28);
  display: block;
}

/* ============ 首屏 ============ */
.page-about .about-intro {
  padding: clamp(24px, 4vw, 44px) 0 clamp(36px, 6vw, 72px);
  background: linear-gradient(180deg, var(--c-mist) 0%, #ffffff 72%);
  border-bottom: 1px solid var(--c-steel);
}

.page-about .about-intro__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 60px);
  align-items: center;
}

.page-about .about-intro__text .breadcrumbs {
  margin-bottom: 20px;
}

.page-about .about-intro__text .section-label {
  display: inline-block;
  margin: 0 0 16px;
}

.page-about .about-intro h1 {
  margin: 0 0 20px;
  font-size: clamp(34px, 5.6vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--c-ink);
  max-width: 16ch;
}

.page-about .about-intro__lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.75;
  color: #35424c;
}

.page-about .about-intro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* 记分牌 */
.page-about .about-scoreboard {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-night);
  border-radius: var(--r-lg);
  overflow: hidden;
  padding: 1px;
  box-shadow: var(--shadow-float);
}

.page-about .about-scoreboard::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(115deg, transparent 46%, rgba(255, 106, 19, .34) 46.4%, rgba(255, 106, 19, .34) 47%, transparent 47.4%),
    radial-gradient(circle at 88% 12%, rgba(31, 122, 90, .55), transparent 58%);
}

.page-about .about-scoreboard__item {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 8px;
  min-width: 0;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--c-home);
  border-top: 2px solid rgba(255, 106, 19, .5);
}

.page-about .about-scoreboard__num {
  color: #ffffff;
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1;
  letter-spacing: -0.01em;
}

.page-about .about-scoreboard__label {
  font-size: 12px;
  letter-spacing: .1em;
  color: rgba(242, 244, 243, .74);
}

/* ============ 主体骨架 ============ */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 60px);
  padding-block: clamp(28px, 4vw, 64px) clamp(48px, 7vw, 110px);
}

/* ============ 左侧时间线索引 ============ */
.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail__title {
  display: none;
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-mute);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 2px 2px 10px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--c-steel);
  border-radius: var(--r-pill);
  background: #ffffff;
  color: var(--c-ink);
  font-size: 13px;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .2s var(--ease), color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--c-line);
  color: var(--c-home);
}

.page-about .about-rail__link[aria-current="true"] {
  border-color: var(--c-orange);
  background: var(--c-orange);
  color: #ffffff;
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  opacity: .8;
}

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

/* ============ 章节通用 ============ */
.page-about .about-chapter {
  padding-block: clamp(36px, 5vw, 76px);
  border-top: 1px solid var(--c-steel);
  scroll-margin-top: 110px;
}

.page-about .about-content > .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__head {
  max-width: var(--w-read);
  margin-bottom: clamp(24px, 3.2vw, 40px);
}

.page-about .about-chapter__no {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-orange);
}

.page-about .about-chapter__title {
  margin: 0 0 16px;
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--c-ink);
}

.page-about .about-chapter__head .lede {
  margin: 0;
  color: var(--c-home);
  font-weight: 700;
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.62;
}

.page-about .about-chapter__head--dark .about-chapter__title,
.page-about .about-chapter__head--dark .lede--dark {
  color: #ffffff;
}

.page-about .about-chapter__figure {
  margin: 0 0 clamp(28px, 4vw, 44px);
}

.page-about .about-inline-link {
  color: var(--c-home);
  text-decoration: underline;
  text-decoration-color: rgba(31, 122, 90, .45);
  text-underline-offset: 3px;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--c-orange);
  text-decoration-color: var(--c-orange);
}

/* ============ 01 时间线 ============ */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 14px;
  bottom: 22px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-line), rgba(31, 122, 90, .08));
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(24px, 3vw, 34px) 42px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 7px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: #ffffff;
  border: 3px solid var(--c-orange);
  box-sizing: border-box;
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--c-orange);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.3;
  font-weight: 800;
  color: var(--c-ink);
}

.page-about .about-timeline__desc {
  margin: 0;
  max-width: var(--w-read);
  font-size: 16px;
  line-height: 1.75;
  color: #3c4a55;
}

/* ============ 02 主场地图 ============ */
.page-about .about-chapter--map {
  padding-block: clamp(28px, 4vw, 56px);
}

.page-about .about-map {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-radius: var(--r-lg);
  background: var(--c-night);
  padding: clamp(26px, 3.6vw, 52px);
}

.page-about .about-map__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .34;
}

.page-about .about-map::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(160deg, rgba(11, 43, 34, .9) 12%, rgba(11, 43, 34, .62) 62%, rgba(11, 43, 34, .88) 100%);
}

.page-about .about-map__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-map__dims-title,
.page-about .about-map__cities-title {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: .16em;
  color: rgba(242, 244, 243, .66);
}

.page-about .about-map__dim-list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: rgba(200, 210, 220, .18);
  border: 1px solid rgba(200, 210, 220, .18);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-map__dim {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 15px 18px;
  background: rgba(20, 80, 60, .78);
  color: var(--c-mist);
  font-size: 15px;
  line-height: 1.5;
}

.page-about .about-map__dim-no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-orange-soft);
}

.page-about .about-map__cities {
  padding: clamp(20px, 2.6vw, 28px);
}

.page-about .about-map__city-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
}

.page-about .about-map__city {
  padding: 7px 14px;
  border: 1px solid rgba(31, 122, 90, .7);
  border-radius: var(--r-pill);
  background: rgba(11, 43, 34, .5);
  color: #ffffff;
  font-size: 14px;
  line-height: 1.3;
  transition: background .22s var(--ease), border-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .about-map__city:hover {
  background: var(--c-orange);
  border-color: var(--c-orange);
  transform: translateY(-2px);
}

.page-about .about-map__city--more {
  border-style: dashed;
  border-color: rgba(255, 178, 94, .7);
  color: var(--c-orange-soft);
}

.page-about .about-map__city--more:hover {
  color: #ffffff;
}

.page-about .about-map__cities-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(242, 244, 243, .72);
}

/* ============ 03 团队 ============ */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 44px);
  align-items: start;
}

.page-about .about-team__groups {
  display: grid;
  gap: 0;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--c-steel);
}

.page-about .about-team__group {
  padding: 18px 0;
  border-bottom: 1px solid var(--c-steel);
}

.page-about .about-team__group-name {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  color: var(--c-ink);
}

.page-about .about-team__group p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: #44525d;
}

.page-about .about-team__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-steel);
  border: 1px solid var(--c-steel);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-team__fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  padding: 16px 14px;
  background: var(--c-ash);
}

.page-about .about-team__fact-num {
  font-family: var(--font-mono);
  font-size: clamp(16px, 1.8vw, 20px);
  font-weight: 600;
  color: var(--c-home);
  line-height: 1.2;
  word-break: break-word;
}

.page-about .about-team__fact-label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--c-mute);
}

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

.page-about .about-chapter .side-note {
  margin-top: clamp(24px, 3vw, 36px);
  padding: 16px 20px;
  border-left: 3px solid var(--c-orange);
  background: var(--c-ash);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  font-size: 15px;
  line-height: 1.72;
  color: #3c4a55;
}

/* ============ 04 合作 ============ */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.2vw, 24px);
}

.page-about .about-partner {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 2.6vw, 30px);
  background: #ffffff;
  border: 1px solid var(--c-steel);
  border-radius: var(--r-md);
}

.page-about .about-partner--lead {
  background: var(--c-night);
  border-color: var(--c-night);
  color: var(--c-mist);
}

.page-about .about-partner__tag {
  margin: 0;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-orange);
}

.page-about .about-partner__title {
  margin: 0;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.28;
  font-weight: 800;
  color: var(--c-ink);
}

.page-about .about-partner--lead .about-partner__title {
  color: #ffffff;
}

.page-about .about-partner__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: #44525d;
}

.page-about .about-partner--lead .about-partner__desc {
  color: rgba(242, 244, 243, .82);
}

.page-about .about-partner__gain {
  margin: 4px 0 0;
  padding-top: 12px;
  border-top: 1px solid rgba(200, 210, 220, .55);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.66;
  color: var(--c-home);
}

.page-about .about-partner--lead .about-partner__gain {
  border-top-color: rgba(31, 122, 90, .7);
  color: var(--c-orange-soft);
}

.page-about .about-partners__foot {
  margin: clamp(22px, 3vw, 32px) 0 0;
  max-width: var(--w-read);
  font-size: 15px;
  line-height: 1.75;
  color: #44525d;
}

/* ============ 05 服务 ============ */
.page-about .about-services {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--c-steel);
  border: 1px solid var(--c-steel);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-service {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 2.4vw, 28px);
  background: var(--c-mist);
}

.page-about .about-service__title {
  margin: 0;
  font-size: clamp(18px, 2vw, 21px);
  font-weight: 800;
  color: var(--c-ink);
}

.page-about .about-service__desc {
  margin: 0;
  flex: 1 1 auto;
  font-size: 15px;
  line-height: 1.74;
  color: #44525d;
}

.page-about .about-service__cycle {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed rgba(200, 210, 220, .9);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--c-mute);
}

.page-about .about-services__foot {
  margin: clamp(22px, 3vw, 30px) 0 0;
  max-width: var(--w-read);
  font-size: 15px;
  line-height: 1.75;
  color: #44525d;
}

/* ============ 06 收束 ============ */
.page-about .about-visit {
  border-top: 0;
}

.page-about .about-visit__box {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 4vw, 56px);
  border-radius: var(--r-lg);
  background: linear-gradient(150deg, var(--c-home) 0%, var(--c-night) 82%);
  color: var(--c-mist);
}

.page-about .about-visit__box::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -90px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  border: 1px solid rgba(255, 106, 19, .5);
  background: radial-gradient(circle, rgba(255, 106, 19, .22), transparent 68%);
  pointer-events: none;
}

.page-about .about-visit__box .about-chapter__title {
  color: #ffffff;
}

.page-about .about-visit__lede {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: rgba(242, 244, 243, .86);
}

.page-about .about-visit__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-visit__note {
  position: relative;
  z-index: 1;
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(242, 244, 243, .68);
}

.page-about .about-visit__note .about-inline-link {
  color: var(--c-orange-soft);
  text-decoration-color: rgba(255, 178, 94, .5);
}

.page-about .about-visit__note .about-inline-link:hover,
.page-about .about-visit__note .about-inline-link:focus-visible {
  color: #ffffff;
  text-decoration-color: #ffffff;
}

/* ============ 响应式 ============ */
@media (min-width: 620px) {
  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-partner--lead {
    grid-column: 1 / -1;
  }

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

@media (min-width: 860px) {
  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  }

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

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }

  .page-about .about-team__figure {
    margin-top: -28px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 116px;
  }

  .page-about .about-rail__title {
    display: block;
  }

  .page-about .about-rail__list {
    position: relative;
    display: block;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 18px;
    bottom: 18px;
    width: 1px;
    background: linear-gradient(180deg, var(--about-line-soft), rgba(31, 122, 90, .06));
  }

  .page-about .about-rail__item {
    display: block;
  }

  .page-about .about-rail__link {
    position: relative;
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 11px 0 11px 26px;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: #46545f;
    font-size: 14px;
    line-height: 1.5;
    white-space: normal;
    transition: color .2s var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    color: var(--c-ink);
  }

  .page-about .about-rail__link[aria-current="true"] {
    background: transparent;
    color: var(--c-orange);
  }

  .page-about .about-rail__dot {
    display: block;
    position: absolute;
    left: 0;
    top: 16px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: #ffffff;
    box-shadow: inset 0 0 0 1px var(--c-steel);
    transition: background .24s var(--ease), box-shadow .24s var(--ease);
  }

  .page-about .about-rail__link[aria-current="true"] .about-rail__dot {
    background: var(--c-orange);
    box-shadow: 0 0 0 4px var(--about-orange-glow);
  }

  .page-about .about-rail__num {
    flex: 0 0 auto;
    padding-top: 2px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-partners {
    grid-template-columns: 1.25fr 1fr 1fr;
  }

  .page-about .about-partner--lead {
    grid-column: auto;
    grid-row: span 1;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-map__city,
  .page-about .about-rail__dot {
    transition: none;
  }
}