.page-about {
  --about-axis: 7px;
  overflow-x: hidden;
  background: var(--ink-950);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(26px, 5vw, 56px) 0 clamp(30px, 5vw, 56px);
  background:
    radial-gradient(120% 100% at 88% 4%, rgba(0, 224, 122, 0.17), transparent 58%),
    radial-gradient(85% 90% at 2% 98%, rgba(53, 242, 230, 0.1), transparent 62%),
    var(--ink-950);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  right: -12%;
  bottom: -34%;
  width: 64%;
  height: 74%;
  background: linear-gradient(135deg, rgba(53, 242, 230, 0.09), transparent 62%);
  transform: skewY(-9deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  right: -150px;
  top: -170px;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: conic-gradient(from 200deg, rgba(0, 224, 122, 0.22), transparent 42%, rgba(255, 138, 43, 0.15) 78%, transparent);
  filter: blur(48px);
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  margin: 0 0 clamp(18px, 3vw, 28px);
  font-size: 13px;
}

.page-about .about-hero .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--pulse);
  border-bottom-color: var(--pulse);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  max-width: 15em;
  font-size: clamp(30px, 6.4vw, 64px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 64ch;
  font-size: clamp(15px, 2.1vw, 18px);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .hero-figures {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .hero-figures li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 16px 18px;
  background: var(--ink-850);
}

.page-about .hero-figures__num {
  font-size: clamp(24px, 4.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--signal);
}

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

/* ============ 章节通用 ============ */
.page-about .about-section {
  position: relative;
  padding: clamp(44px, 7vw, 88px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section--deep {
  background: linear-gradient(180deg, var(--ink-950) 0%, var(--ink-850) 16%, var(--ink-850) 84%, var(--ink-950) 100%);
}

.page-about .section__title {
  margin: 10px 0 0;
  max-width: 20em;
  font-size: clamp(23px, 4.2vw, 42px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-about .section__lede {
  margin: 14px 0 0;
  max-width: 66ch;
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-subhead {
  margin: 0 0 12px;
  font-size: clamp(17px, 2.6vw, 21px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--chalk);
}

.page-about .about-chart__kicker {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--pulse);
}

/* ============ 时间轴 ============ */
.page-about .about-hero-media {
  margin: clamp(26px, 4vw, 42px) 0 0;
}

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

.page-about .media-frame {
  margin: 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-750);
}

.page-about .media-frame figcaption {
  padding: 12px 16px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
  background: var(--ink-850);
  border-top: 1px solid var(--line);
}

.page-about .about-hero-media img {
  aspect-ratio: 14 / 8;
}

.page-about .about-layer-media img {
  aspect-ratio: 10 / 7;
}

.page-about .about-crew__media img {
  aspect-ratio: 12 / 7;
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: var(--about-axis);
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--signal), var(--pulse) 46%, var(--line) 88%);
  opacity: 0.6;
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 clamp(20px, 3.2vw, 30px) 38px;
}

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

.page-about .timeline__marker {
  position: absolute;
  left: 0;
  top: 9px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 4px rgba(53, 242, 230, 0.2);
}

.page-about .timeline__item:last-child .timeline__marker {
  background: var(--highlight);
  box-shadow: 0 0 0 4px rgba(255, 138, 43, 0.22);
}

.page-about .timeline__details summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 6px 0;
  cursor: pointer;
  list-style: none;
  border-radius: var(--radius-sm);
  outline-offset: 4px;
  transition: color 0.2s var(--ease);
}

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

.page-about .timeline__details summary::after {
  content: "+";
  margin-left: auto;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--pulse);
}

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

.page-about .timeline__details summary:hover .timeline__name,
.page-about .timeline__details summary:focus-visible .timeline__name {
  color: var(--pulse);
}

.page-about .timeline__year {
  display: inline-block;
  padding: 3px 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-950);
  background: var(--signal);
  border-radius: var(--radius-pill);
}

.page-about .timeline__name {
  font-size: clamp(16px, 2.4vw, 20px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--chalk);
  transition: color 0.2s var(--ease);
}

.page-about .timeline__body {
  padding: 10px 0 2px;
}

.page-about .timeline__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

/* ============ 数据覆盖 ============ */
.page-about .about-tiles {
  margin: clamp(26px, 4vw, 42px) 0 0;
}

.page-about .stat-tile {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 18px 20px;
  background: var(--ink-750);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .stat-tile:hover {
  transform: translateY(-2px);
  border-color: var(--pulse);
}

.page-about .stat-tile__value {
  margin: 0;
  font-size: clamp(26px, 4.2vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--signal);
}

.page-about .stat-tile__value em {
  font-style: normal;
  font-size: 0.55em;
  vertical-align: 0.35em;
  color: var(--pulse);
}

.page-about .stat-tile__label {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-coverage {
  margin: clamp(26px, 4vw, 44px) 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 36px);
}

.page-about .about-chart {
  margin: 0;
  padding: 18px 16px 14px;
  background: var(--ink-750);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
}

.page-about .about-chart__caption {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 0 0 12px;
}

.page-about .about-chart__title {
  font-size: 15px;
  font-weight: 700;
  color: var(--chalk);
}

.page-about .about-chart__scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-chart__scroll svg {
  display: block;
  min-width: 520px;
  width: 100%;
  height: auto;
}

.page-about .about-coverage__notes p {
  margin: 0 0 14px;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-facts {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-facts li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
  border-bottom: 1px solid var(--line);
}

.page-about .about-facts .mono {
  flex: none;
  min-width: 3.4em;
  font-size: 17px;
  font-weight: 700;
  color: var(--pulse);
}

/* ============ 三层数据体系 ============ */
.page-about .about-layers {
  margin: clamp(26px, 4vw, 42px) 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .layer-card {
  padding: 22px 20px 24px;
  background: var(--ink-850);
  transition: background 0.25s var(--ease);
}

.page-about .layer-card:hover {
  background: var(--ink-750);
}

.page-about .layer-card--signal {
  background: linear-gradient(160deg, rgba(0, 224, 122, 0.12), var(--ink-850) 62%);
}

.page-about .layer-card__tag {
  display: block;
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--pulse);
}

.page-about .layer-card h3 {
  margin: 0 0 10px;
  font-size: clamp(18px, 2.6vw, 22px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--chalk);
}

.page-about .layer-card p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--mist);
}

.page-about .layer-card__foot {
  margin: 0 !important;
  padding-top: 12px;
  font-size: 13px !important;
  color: var(--signal) !important;
  border-top: 1px solid var(--line);
}

.page-about .about-layer-media {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

/* ============ 团队 ============ */
.page-about .about-crew {
  margin: clamp(26px, 4vw, 44px) 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 36px);
}

.page-about .about-crew__total {
  margin: 0 0 12px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--chalk);
}

.page-about .about-crew__total .mono {
  font-size: clamp(44px, 9vw, 76px);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.04em;
  color: var(--signal);
}

.page-about .about-crew__total-unit {
  font-size: 16px;
  color: var(--mist);
}

.page-about .about-crew__body > p {
  margin: 0 0 16px;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .crew-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .crew-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .crew-list__num {
  flex: none;
  min-width: 2.4em;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--pulse);
}

.page-about .crew-list__text {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .crew-list__text strong {
  font-size: 15px;
  font-weight: 700;
  color: var(--chalk);
}

.page-about .crew-list__text span {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-crew__note {
  margin: 16px 0 0 !important;
  padding-left: 14px;
  font-size: 13.5px !important;
  line-height: 1.7;
  color: var(--mist);
  border-left: 2px solid var(--highlight);
}

/* ============ 安全保障 ============ */
.page-about .assure-list {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .assure-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 18px 0 20px;
  border-bottom: 1px solid var(--line);
}

.page-about .assure-list h3 {
  margin: 0;
  font-size: clamp(16px, 2.4vw, 19px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--chalk);
}

.page-about .assure-list h3::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 10px;
  vertical-align: 0.08em;
  border-radius: 50%;
  background: var(--signal);
}

.page-about .assure-list p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

/* ============ 合作生态 ============ */
.page-about .partner-grid {
  margin: clamp(26px, 4vw, 42px) 0 0;
}

.page-about .partner-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px 24px;
  background: var(--ink-750);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .partner-card:hover {
  transform: translateY(-2px);
  border-color: var(--pulse);
}

.page-about .partner-card__num {
  margin: 0;
  font-size: clamp(34px, 5.6vw, 48px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--signal);
}

.page-about .partner-card h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--chalk);
}

.page-about .partner-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--mist);
}

.page-about .honor-band {
  margin: clamp(24px, 3.6vw, 36px) 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .honor-band__item {
  padding: 18px 18px 20px;
  background: var(--ink-850);
}

.page-about .honor-band__label {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--highlight);
}

.page-about .honor-band__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--chalk);
}

/* ============ 下一步 ============ */
.page-about .about-next {
  padding-bottom: clamp(52px, 8vw, 96px);
  border-bottom: 0;
}

.page-about .about-next__lede {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-next__grid {
  margin: clamp(24px, 4vw, 40px) 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .next-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px 22px;
  text-decoration: none;
  background: var(--ink-850);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--pulse);
  background: var(--ink-750);
}

.page-about .next-card__kicker {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--pulse);
}

.page-about .next-card__title {
  font-size: clamp(16px, 2.4vw, 19px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--chalk);
}

.page-about .next-card__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-next__close {
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding-top: clamp(20px, 3vw, 28px);
  max-width: 52ch;
  font-size: clamp(17px, 2.8vw, 24px);
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--chalk);
  border-top: 1px solid var(--line);
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .hero-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .assure-list li {
    grid-template-columns: minmax(0, 15em) minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

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

@media (min-width: 900px) {
  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-crew {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .timeline__item {
    padding-left: 46px;
  }

  .page-about .timeline {
    --about-axis: 7px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-layers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .layer-card {
    padding: 28px 26px 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stat-tile,
  .page-about .partner-card,
  .page-about .next-card,
  .page-about .timeline__name {
    transition: none;
  }

  .page-about .stat-tile:hover,
  .page-about .partner-card:hover,
  .page-about .next-card:hover,
  .page-about .next-card:focus-visible {
    transform: none;
  }
}