.page-about {
  --pa-zone: clamp(52px, 7vw, 96px);
  --pa-notch: 3px 18px 3px 18px;
  color: var(--white);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: clip;
}

.page-about .section {
  padding-block: var(--pa-zone);
}

.page-about a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(159, 216, 255, 0.3);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  padding-top: 24px;
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .crumbs__item {
  color: inherit;
  text-decoration: none;
  border-bottom: 0;
}

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

.page-about .crumbs__item[aria-current="page"] {
  color: var(--cyan);
}

.page-about .crumbs__sep {
  color: var(--line);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  padding-block: 30px var(--pa-zone);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -180px;
  right: -180px;
  width: min(760px, 96vw);
  height: min(760px, 96vw);
  background: radial-gradient(circle at 50% 50%, rgba(22, 224, 208, 0.16), rgba(22, 224, 208, 0) 68%);
  pointer-events: none;
  z-index: -1;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 36px;
  align-items: start;
}

.page-about .ab-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 7.6vw, 62px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--white);
  text-wrap: balance;
}

.page-about .ab-hero__lede {
  margin: 22px 0 0;
  max-width: 56ch;
  font-size: 16.5px;
  color: var(--mist);
  text-align: justify;
}

.page-about .ab-hero__facts {
  list-style: none;
  margin: 34px 0 0;
  padding: 24px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
  border-top: 1px solid var(--line);
}

.page-about .ab-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.page-about .ab-hero__facts .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 5vw, 28px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--cyan);
}

.page-about .ab-hero__facts li > span:last-child {
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .ab-hero__fig {
  margin: 0;
}

.page-about .ab-hero__fig img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--pa-notch);
  filter: saturate(0.9) contrast(1.06);
}

.page-about .figure__cap {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 栏目标题 ---------- */
.page-about .sechead {
  margin-bottom: 36px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .sechead__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.28;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .sechead__meta {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-tl__item {
  position: relative;
  padding: 30px 0 30px 32px;
}

.page-about .ab-tl__item::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-about .ab-tl__item:last-child::after {
  background: linear-gradient(180deg, var(--line), rgba(27, 42, 74, 0));
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 40px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(22, 224, 208, 0.13);
  z-index: 1;
}

.page-about .ab-tl__item:nth-child(4)::before {
  background: rgba(22, 224, 208, 0.72);
  box-shadow: 0 0 0 4px rgba(22, 224, 208, 0.09);
}

.page-about .ab-tl__item:nth-child(5)::before {
  background: var(--mist);
  box-shadow: 0 0 0 4px rgba(201, 211, 224, 0.12);
}

.page-about .ab-tl__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .ab-tl__h {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.42;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .ab-tl__body p {
  margin: 0 0 12px;
  max-width: 62ch;
  font-size: 16px;
  color: var(--mist);
  text-align: justify;
}

.page-about .ab-tl__note {
  margin: 14px 0 0;
  padding: 10px 0 10px 16px;
  border-left: 2px solid rgba(22, 224, 208, 0.4);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ice);
}

/* ---------- 信息带 ---------- */
.page-about .ab-band {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin: 0;
  padding: 16px 20px;
  background: var(--ink-2);
  border-radius: var(--pa-notch);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .ab-band .band__dot {
  flex: none;
  margin-top: 7px;
}

/* ---------- 团队 ---------- */
.page-about .ab-team__grid {
  display: grid;
  gap: 36px;
  align-items: start;
}

.page-about .ab-team__fig {
  margin: 0;
}

.page-about .ab-team__fig img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--pa-notch);
  filter: saturate(0.85);
}

.page-about .ab-team__bars {
  display: grid;
  gap: 18px;
  padding-bottom: 30px;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-bar {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 14px;
  align-items: baseline;
}

.page-about .ab-bar__name {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-about .ab-bar__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--mist);
}

.page-about .ab-bar__track {
  grid-column: 1 / -1;
  height: 6px;
  border-radius: 999px;
  background: var(--ink-2);
  overflow: hidden;
}

.page-about .ab-bar__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--deep-teal), var(--cyan));
}

.page-about .ab-bar:nth-child(1) .ab-bar__fill { width: 41%; }
.page-about .ab-bar:nth-child(2) .ab-bar__fill { width: 33.3%; }
.page-about .ab-bar:nth-child(3) .ab-bar__fill { width: 25.6%; }

/* ---------- 分段切换 ---------- */
.page-about .ab-tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-tabs .tabs__tab {
  appearance: none;
  cursor: pointer;
  padding: 9px 16px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--mist);
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 3px 14px 3px 14px;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-tabs .tabs__tab:hover {
  color: var(--white);
  border-color: rgba(22, 224, 208, 0.5);
}

.page-about .ab-tabs .tabs__tab[aria-selected="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .ab-tabs .tabs__tab:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .ab-tabs .tabs__panels {
  padding-top: 24px;
}

.page-about .ab-tabs .tabs__panel p {
  margin: 0 0 14px;
  max-width: 60ch;
  font-size: 16px;
  color: var(--mist);
  text-align: justify;
}

.page-about .ab-tabs .tabs__panel ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .ab-tabs .tabs__panel li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ice);
}

.page-about .ab-tabs .tabs__panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 覆盖范围 ---------- */
.page-about .ab-cov__lead {
  margin: 0 0 34px;
  max-width: 66ch;
  font-size: 16.5px;
  color: var(--mist);
  text-align: justify;
}

.page-about .ab-cov__metrics {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 30px 24px;
  margin: 0;
}

.page-about .ab-cov .metric {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 20px;
  border-top: 2px solid var(--line);
  min-width: 0;
}

.page-about .ab-cov .metric__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 6vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-cov .metric--orange .metric__value { color: var(--orange); }
.page-about .ab-cov .metric--ice .metric__value { color: var(--ice); }

.page-about .ab-cov .metric__label {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .ab-cov__tail {
  margin: 36px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 协作生态 ---------- */
.page-about .ab-eco__grid {
  display: grid;
  gap: 36px;
  align-items: start;
}

.page-about .ab-eco__map {
  display: block;
  width: 100%;
  height: auto;
  max-width: 460px;
  margin: 0 auto;
}

.page-about .ab-eco__legend {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-eco__legend li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-eco__dot {
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .ab-eco__legend li:nth-child(2) .ab-eco__dot { background: var(--ice); }
.page-about .ab-eco__legend li:nth-child(3) .ab-eco__dot { background: var(--mist); }

.page-about .ab-eco__dis {
  border-top: 1px solid var(--line);
  padding: 18px 0;
}

.page-about .ab-eco__dis:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .ab-eco__dis .disclosure__sum {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .ab-eco__dis .disclosure__sum::-webkit-details-marker {
  display: none;
}

.page-about .ab-eco__dis .disclosure__sum::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 400;
  color: var(--cyan);
}

.page-about .ab-eco__dis[open] .disclosure__sum::after {
  content: "–";
}

.page-about .ab-eco__dis .disclosure__sum:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-about .ab-eco__dis .disclosure__body {
  padding-top: 12px;
  max-width: 62ch;
}

.page-about .ab-eco__dis .disclosure__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
  text-align: justify;
}

.page-about .ab-eco__figure {
  margin: 40px 0 0;
}

.page-about .ab-eco__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: var(--pa-notch);
  filter: saturate(0.9);
}

/* ---------- 认可 ---------- */
.page-about .ab-honor {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 34px;
}

.page-about .ab-honor__item {
  display: grid;
  gap: 10px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .ab-honor__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
  color: var(--amber);
}

.page-about .ab-honor__txt h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .ab-honor__txt p {
  margin: 0;
  max-width: 64ch;
  font-size: 15.5px;
  color: var(--mist);
  text-align: justify;
}

.page-about .ab-honor__tail {
  margin: 34px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 合作 ---------- */
.page-about .ab-coop {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .ab-coop__card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 28px 24px 26px;
  border-radius: var(--pa-notch);
  background: var(--ink-2);
  transition: background 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .ab-coop__card:hover {
  background: #12203c;
  transform: translateY(-3px);
}

.page-about .ab-coop__num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .ab-coop__h {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--white);
}

.page-about .ab-coop__p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
  text-align: justify;
}

.page-about .ab-coop__meta {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--ice);
}

.page-about .ab-coop__card .btn {
  align-self: flex-start;
  margin-top: 4px;
  border-bottom: 0;
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta__inner {
  display: grid;
  gap: 26px;
  padding: 36px 26px;
  border-radius: 4px 32px 4px 32px;
  background: linear-gradient(135deg, var(--deep-teal) 0%, var(--ink-2) 78%);
  border: 1px solid rgba(22, 224, 208, 0.22);
}

.page-about .ab-cta__title {
  margin: 12px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(22px, 4.4vw, 32px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .ab-cta__copy p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .ab-cta__btn {
  align-self: flex-start;
  border-bottom: 0;
}

/* ---------- 按钮通用兜底 ---------- */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 22px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  border-radius: 3px 14px 3px 14px;
  text-decoration: none;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .btn--ghost {
  color: var(--ice);
  background: transparent;
  border: 1px solid rgba(159, 216, 255, 0.45);
}

.page-about .btn--ghost:hover {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .btn--solid {
  color: var(--ink);
  background: var(--cyan);
  border: 1px solid var(--cyan);
}

.page-about .btn--solid:hover {
  background: var(--white);
  border-color: var(--white);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .ab-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-cov__metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 34px 24px;
  }

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

  .page-about .ab-honor {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 40px;
  }

  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
    padding: 44px 40px;
  }

  .page-about .ab-cta__btn {
    align-self: center;
  }

  .page-about .ab-band {
    padding: 18px 26px;
    font-size: 14.5px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.28fr) minmax(0, 0.72fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-hero__fig img {
    aspect-ratio: 4 / 5;
  }

  .page-about .ab-tl__item {
    display: grid;
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 0 52px;
    padding: 36px 0;
  }

  .page-about .ab-tl__item::after {
    left: 174px;
  }

  .page-about .ab-tl__item::before {
    left: 170px;
    top: 42px;
  }

  .page-about .ab-tl__year {
    position: sticky;
    top: 116px;
    font-size: 28px;
  }

  .page-about .ab-tl__h {
    margin-top: 2px;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    gap: 48px;
  }

  .page-about .ab-eco__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 52px;
  }

  .page-about .ab-eco__map {
    margin: 0;
  }

  .page-about .ab-eco__figure {
    margin-top: 52px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-coop__card,
  .page-about .ab-tabs .tabs__tab,
  .page-about .btn {
    transition: none;
  }

  .page-about .ab-coop__card:hover {
    transform: none;
  }
}