.page-about {
  --about-line: rgba(30, 58, 92, .85);
  --about-glow: rgba(0, 229, 255, .18);
  --about-gap: clamp(64px, 9vw, 112px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(24px, 5vw, 56px) 0 clamp(48px, 7vw, 88px);
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  font-size: clamp(28px, 6.2vw, 52px);
  line-height: 1.14;
  letter-spacing: .015em;
  font-weight: 800;
  color: var(--white);
  max-width: 19ch;
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 64px;
  height: 4px;
  margin-top: 22px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  border-radius: 2px;
}

.page-about .about-hero__lead {
  margin: 26px 0 0;
  max-width: 68ch;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rail);
  border: 1px solid var(--rail);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-hero__facts > li {
  background: var(--deep);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-fact__num {
  color: var(--cyan);
  font-size: clamp(22px, 4.4vw, 30px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
}

.page-about .about-fact__lbl {
  color: var(--mist);
  font-size: 13px;
  line-height: 1.5;
}

/* ---------- 时间轴章节 ---------- */
.page-about .about-track .section__head {
  max-width: 62ch;
}

.page-about .about-track__banner {
  margin: 44px 0 0;
}

.page-about .about-track__index {
  margin-top: clamp(32px, 5vw, 48px);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

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

.page-about .about-track__index ul {
  list-style: none;
  margin: 0;
  padding: 4px 0;
  display: flex;
  gap: 10px;
  min-width: max-content;
}

.page-about .about-track__index a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--rail);
  border-radius: 999px;
  color: var(--mist);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color .25s var(--ease), border-color .25s var(--ease), background-color .25s var(--ease);
}

.page-about .about-track__index a .mono {
  color: var(--cyan);
  font-size: 12px;
}

.page-about .about-track__index a:hover,
.page-about .about-track__index a:focus-visible {
  color: var(--white);
  border-color: var(--cyan);
  background: rgba(0, 229, 255, .08);
}

.page-about .timeline {
  list-style: none;
  margin: clamp(36px, 6vw, 64px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg,
      rgba(0, 229, 255, 0) 0%,
      var(--cyan) 6%,
      var(--rail) 45%,
      var(--rail) 85%,
      rgba(30, 58, 92, 0) 100%);
}

.page-about .timeline__node {
  position: relative;
  padding-left: 40px;
  margin-bottom: 40px;
}

.page-about .timeline__node:last-child {
  margin-bottom: 0;
}

.page-about .timeline__dot {
  position: absolute;
  left: 0;
  top: 22px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(0, 229, 255, .1), 0 0 16px rgba(0, 229, 255, .7);
}

.page-about .timeline__dot--live {
  background: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 107, 53, .14), 0 0 18px rgba(255, 107, 53, .8);
}

.page-about .timeline__card {
  padding: 22px 20px 24px;
  border-radius: var(--r-lg);
}

.page-about .timeline__card--current {
  border-color: rgba(255, 107, 53, .45);
  box-shadow: 0 0 0 1px rgba(255, 107, 53, .18), var(--shadow-soft);
}

.page-about .timeline__year {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(0, 229, 255, .1);
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.page-about .timeline__card--current .timeline__year {
  background: rgba(255, 107, 53, .14);
  color: var(--orange);
}

.page-about .timeline__title {
  margin: 0 0 12px;
  font-size: clamp(19px, 3.6vw, 23px);
  line-height: 1.35;
  font-weight: 700;
  color: var(--white);
}

.page-about .timeline__card p {
  margin: 0;
  color: var(--mist);
  font-size: 15.5px;
  line-height: 1.75;
}

.page-about .timeline__card p + p {
  margin-top: 12px;
}

.page-about .timeline__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* ---------- 数据章节 ---------- */
.page-about .about-data .section__head {
  max-width: 64ch;
}

.page-about .about-data__grid {
  margin-top: clamp(32px, 5vw, 52px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-data__cell {
  padding: 24px 20px;
  border-radius: var(--r-md);
}

.page-about .about-data__cell h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
  line-height: 1.4;
}

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

.page-about .about-data__label {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 11.5px;
  letter-spacing: .12em;
}

.page-about .about-data__value {
  margin: 0 0 14px;
  font-size: clamp(30px, 7vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: .01em;
}

.page-about .about-data__cell .meter {
  margin-top: 16px;
  display: block;
}

.page-about .about-data__foot {
  margin: 28px 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--rail);
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.75;
  max-width: 72ch;
}

.page-about .about-data__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, .35);
}

.page-about .about-data__foot a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 团队章节 ---------- */
.page-about .about-team__grid {
  align-items: start;
}

.page-about .about-team__lead {
  margin: 20px 0 0;
  color: var(--mist);
  font-size: 15.5px;
  line-height: 1.75;
}

.page-about .about-team__folds {
  margin-top: 28px;
  border-top: 1px solid var(--rail);
}

.page-about .about-team__fold {
  border-bottom: 1px solid var(--rail);
}

.page-about .about-team__fold summary {
  cursor: pointer;
  list-style: none;
  padding: 18px 30px 18px 0;
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "count role"
    "count hint";
  gap: 2px 14px;
  align-items: center;
}

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

.page-about .about-team__fold summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--cyan);
  font-size: 20px;
  line-height: 1;
  transition: transform .25s var(--ease);
}

.page-about .about-team__fold[open] summary::after {
  content: "−";
}

.page-about .about-team__count {
  grid-area: count;
  color: var(--cyan);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  min-width: 2.6em;
}

.page-about .about-team__role {
  grid-area: role;
  color: var(--white);
  font-size: 16.5px;
  font-weight: 700;
}

.page-about .about-team__hint {
  grid-area: hint;
  color: var(--muted);
  font-size: 12.5px;
  letter-spacing: .02em;
}

.page-about .about-team__fold p {
  margin: 0 0 18px;
  padding-right: 8px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.75;
  max-width: 62ch;
}

.page-about .about-team__rest {
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.7;
}

.page-about .about-team__media {
  margin-top: 32px;
  border-radius: var(--r-lg);
  overflow: hidden;
}

/* ---------- 资质章节 ---------- */
.page-about .about-cred__panel {
  position: relative;
  border-radius: var(--r-lg);
  border: 1px solid var(--rail);
  background: linear-gradient(150deg, var(--deep) 0%, var(--void) 62%);
  overflow: hidden;
  padding: clamp(28px, 6vw, 56px) clamp(20px, 5vw, 52px);
}

.page-about .about-cred__bg {
  position: absolute;
  right: -8%;
  top: -12%;
  width: min(560px, 72%);
  height: auto;
  opacity: .16;
  pointer-events: none;
  filter: saturate(.7);
}

.page-about .about-cred__body {
  position: relative;
  z-index: 1;
}

.page-about .about-cred__lead {
  margin: 20px 0 0;
  max-width: 64ch;
  color: var(--mist);
  font-size: 15.5px;
  line-height: 1.75;
}

.page-about .about-cred__badges {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-cred__badge {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  padding: 20px;
  border-radius: var(--r-md);
  background: rgba(16, 42, 69, .62);
  border: 1px solid var(--rail);
  backdrop-filter: blur(6px);
}

.page-about .about-cred__badge strong {
  display: block;
  color: var(--white);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 8px;
}

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

.page-about .about-cred__mark {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: block;
  position: relative;
  flex: none;
}

.page-about .about-cred__mark--a {
  background: linear-gradient(140deg, rgba(0, 229, 255, .34), rgba(0, 229, 255, .04));
  border: 1px solid rgba(0, 229, 255, .5);
}

.page-about .about-cred__mark--a::after {
  content: "";
  position: absolute;
  inset: 12px 13px 13px;
  border: 2px solid var(--cyan);
  border-radius: 50% 50% 50% 6px;
  transform: rotate(45deg);
}

.page-about .about-cred__mark--b {
  background: linear-gradient(140deg, rgba(255, 107, 53, .3), rgba(255, 107, 53, .04));
  border: 1px solid rgba(255, 107, 53, .48);
}

.page-about .about-cred__mark--b::after {
  content: "";
  position: absolute;
  inset: 13px;
  border-radius: 3px;
  background:
    linear-gradient(90deg, var(--orange) 0 30%, transparent 30% 40%, var(--orange) 40% 100%) 0 0 / 100% 3px no-repeat,
    linear-gradient(90deg, transparent 0 22%, var(--orange) 22% 100%) 0 50% / 100% 3px no-repeat,
    linear-gradient(90deg, var(--orange) 0 62%, transparent 62%) 0 100% / 100% 3px no-repeat;
}

.page-about .about-cred__note {
  margin: 26px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
  max-width: 68ch;
}

.page-about .about-cred__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, .35);
}

.page-about .about-cred__note a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__body p {
  margin: 20px 0 0;
  color: var(--mist);
  font-size: 15.5px;
  line-height: 1.78;
  max-width: 64ch;
}

.page-about .about-partners__stats {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rail);
  border: 1px solid var(--rail);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-partners__stats > li {
  background: var(--deep);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-partners__num {
  color: var(--cyan);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
}

.page-about .about-partners__cap {
  color: var(--mist);
  font-size: 12.5px;
  line-height: 1.5;
}

.page-about .about-partners__note {
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .about-partners__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, .35);
}

.page-about .about-partners__note a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-partners__aside {
  margin-top: 36px;
  display: grid;
  gap: 14px;
}

.page-about .about-partners__award {
  padding: 22px 20px;
  border-radius: var(--r-md);
  border-left: 3px solid var(--orange);
}

.page-about .about-partners__award-year {
  margin: 0 0 10px;
  color: var(--orange);
  font-size: 12.5px;
  letter-spacing: .1em;
}

.page-about .about-partners__award h3 {
  margin: 0 0 8px;
  color: var(--white);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
}

.page-about .about-partners__award p {
  margin: 0;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 服务版图 ---------- */
.page-about .about-reach .section__head {
  max-width: 62ch;
}

.page-about .about-reach__layout {
  margin-top: clamp(32px, 5vw, 48px);
  display: grid;
  gap: 28px;
}

.page-about .about-reach__map {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: var(--r-lg);
  border: 1px solid var(--rail);
  background-color: var(--deep);
  background-image: radial-gradient(circle, rgba(30, 58, 92, .95) 1.4px, transparent 1.5px);
  background-size: 22px 22px;
  background-position: 11px 11px;
  overflow: hidden;
}

.page-about .about-reach__map::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 55% at 24% 28%, rgba(0, 229, 255, .16), transparent 70%),
    radial-gradient(50% 45% at 70% 66%, rgba(255, 107, 53, .12), transparent 72%);
  pointer-events: none;
}

.page-about .about-reach__pin {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 6px rgba(0, 229, 255, .1), 0 0 16px rgba(0, 229, 255, .8);
  z-index: 1;
}

.page-about .about-reach__pin:nth-child(1) { left: 24%; top: 26%; }
.page-about .about-reach__pin:nth-child(2) { left: 62%; top: 34%; }
.page-about .about-reach__pin:nth-child(3) { left: 70%; top: 62%; }
.page-about .about-reach__pin:nth-child(4) { left: 32%; top: 66%; }
.page-about .about-reach__pin:nth-child(5) { left: 46%; top: 14%; background: var(--orange); box-shadow: 0 0 0 6px rgba(255, 107, 53, .12), 0 0 16px rgba(255, 107, 53, .8); }

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

.page-about .about-reach__zone {
  padding: 16px 18px;
  border-radius: var(--r-sm);
  border: 1px solid var(--rail);
  background: rgba(10, 26, 47, .72);
}

.page-about .about-reach__zone p {
  margin: 10px 0 0;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-reach__foot {
  margin: 26px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .about-reach__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, .35);
}

.page-about .about-reach__foot a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 后续指引 ---------- */
.page-about .about-next__panel {
  position: relative;
  padding: clamp(28px, 6vw, 56px) clamp(20px, 5vw, 52px);
  border-radius: var(--r-lg);
  border: 1px solid var(--rail);
  background:
    linear-gradient(115deg, rgba(0, 229, 255, .09) 0%, transparent 42%),
    linear-gradient(200deg, rgba(255, 107, 53, .08) 0%, transparent 46%),
    var(--deep);
}

.page-about .about-next__title {
  margin: 16px 0 0;
  font-size: clamp(22px, 4.6vw, 32px);
  line-height: 1.25;
  font-weight: 800;
  color: var(--white);
  max-width: 24ch;
  letter-spacing: .01em;
}

.page-about .about-next__lead {
  margin: 18px 0 0;
  max-width: 62ch;
  color: var(--mist);
  font-size: 15.5px;
  line-height: 1.75;
}

.page-about .about-next__links {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-next__links a {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "idx name"
    "idx desc";
  gap: 4px 16px;
  align-items: center;
  padding: 18px 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--rail);
  background: rgba(5, 13, 24, .55);
  text-decoration: none;
  transition: border-color .25s var(--ease), transform .25s var(--ease), background-color .25s var(--ease);
}

.page-about .about-next__links a .mono {
  grid-area: idx;
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: .08em;
}

.page-about .about-next__links strong {
  grid-area: name;
  color: var(--white);
  font-size: 16px;
  font-weight: 700;
}

.page-about .about-next__links a > span:last-child {
  grid-area: desc;
  color: var(--mist);
  font-size: 13.5px;
  line-height: 1.6;
}

.page-about .about-next__links a:hover,
.page-about .about-next__links a:focus-visible {
  border-color: var(--cyan);
  background: rgba(0, 229, 255, .07);
  transform: translateY(-3px);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-data__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-cred__badges {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-reach__zones {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-next__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-team__media {
    margin-top: 8px;
  }
}

@media (min-width: 960px) {
  .page-about .about-track__index {
    overflow: visible;
  }

  .page-about .timeline::before {
    left: 24px;
  }

  .page-about .timeline__node {
    padding-left: 84px;
    margin-bottom: 52px;
  }

  .page-about .timeline__dot {
    left: 18px;
    top: 26px;
  }

  .page-about .timeline__card {
    padding: 30px 32px 32px;
  }

  .page-about .about-reach__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    gap: 36px;
  }

  .page-about .about-reach__map {
    aspect-ratio: 1 / 1;
  }

  .page-about .about-partners__aside {
    margin-top: 0;
  }

  .page-about .about-team__grid {
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-team__media {
    position: sticky;
    top: calc(var(--header-h) + 32px);
  }
}

@media (max-width: 480px) {
  .page-about .about-team__fold summary {
    grid-template-areas:
      "count role"
      "hint hint";
  }

  .page-about .about-team__hint {
    margin-left: 0;
  }

  .page-about .about-hero__facts {
    border-radius: var(--r-sm);
  }

  .page-about .about-cred__badge {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__links a,
  .page-about .about-track__index a,
  .page-about .about-team__fold summary::after {
    transition: none;
  }

  .page-about .about-next__links a:hover {
    transform: none;
  }
}