.page-about {
  --ab-pad: clamp(18px, 4vw, 34px);
  position: relative;
  color: var(--paper);
  background:
    radial-gradient(780px 420px at 90% 0%, rgba(255, 197, 61, 0.09), transparent 62%),
    radial-gradient(620px 380px at 4% 42%, rgba(47, 164, 106, 0.08), transparent 66%),
    var(--ink-900);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding: clamp(14px, 2.4vw, 22px) 0 0;
}
.page-about .about-crumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}
.page-about .about-crumb__list li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--line);
}
.page-about .about-crumb__list a {
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .about-crumb__list a:hover,
.page-about .about-crumb__list a:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}
.page-about .about-crumb__list [aria-current="page"] {
  color: var(--paper);
}

/* ---------- 框景首屏 ---------- */
.page-about .about-hero {
  padding: clamp(18px, 3.2vw, 38px) 0 clamp(34px, 5.5vw, 64px);
}
.page-about .about-hero__frame {
  position: relative;
  padding: clamp(26px, 5vw, 60px) clamp(20px, 4.4vw, 56px) clamp(28px, 4.6vw, 54px);
  border: 1px solid var(--line);
  background:
    linear-gradient(155deg, rgba(19, 28, 46, 0.94) 0%, rgba(11, 18, 32, 0.78) 58%, rgba(30, 58, 95, 0.4) 100%);
}
.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid var(--gold);
}
.page-about .about-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right-color: transparent;
  border-bottom-color: transparent;
}
.page-about .about-hero__frame::after {
  right: -1px;
  bottom: -1px;
  border-left-color: transparent;
  border-top-color: transparent;
}
.page-about .about-hero__kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}
.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(32px, 6.2vw, 76px);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--paper);
}
.page-about .about-hero__title-accent {
  background: linear-gradient(180deg, transparent 64%, rgba(255, 197, 61, 0.3) 64%);
}
.page-about .about-hero__lede {
  max-width: 64ch;
  margin: 24px 0 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.9;
  color: var(--steel);
}
.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-hero__facts > li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ink-850);
}
.page-about .about-hero__fact-num {
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}
.page-about .about-hero__fact-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}
@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  padding-top: clamp(34px, 5.5vw, 70px);
  padding-bottom: clamp(56px, 9vw, 104px);
}
.page-about .about-flow {
  display: grid;
  gap: clamp(56px, 8vw, 104px);
  min-width: 0;
}

/* ---------- 侧边刻度尺 ---------- */
.page-about .about-ruler {
  display: none;
}
@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 62px minmax(0, 1fr);
  }
  .page-about .about-ruler {
    display: block;
    position: sticky;
    top: 108px;
    align-self: start;
  }
}
.page-about .about-ruler__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}
.page-about .about-ruler__list a {
  display: block;
  text-decoration: none;
  color: var(--steel);
  font-size: 11px;
  letter-spacing: 0.1em;
  transition: color 0.2s var(--ease);
}
.page-about .about-ruler__list a::before {
  content: "";
  display: block;
  width: 18px;
  height: 2px;
  margin-bottom: 7px;
  background: var(--line);
  transition: width 0.24s var(--ease), background-color 0.2s var(--ease);
}
.page-about .about-ruler__list a:hover,
.page-about .about-ruler__list a:focus-visible {
  color: var(--gold);
}
.page-about .about-ruler__list a:hover::before,
.page-about .about-ruler__list a:focus-visible::before {
  width: 32px;
  background: var(--gold);
}

/* ---------- 章节头 ---------- */
.page-about .about-section {
  scroll-margin-top: 120px;
  min-width: 0;
}
.page-about .about-section__head {
  position: relative;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}
.page-about .about-section__head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 72px;
  height: 3px;
  background: var(--gold);
}
.page-about .about-section__index {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}
.page-about .about-section__title {
  margin: 0;
  font-size: clamp(24px, 4vw, 44px);
  font-weight: 300;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--paper);
}

/* ---------- 正文 ---------- */
.page-about .about-text {
  max-width: 68ch;
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--steel);
}
.page-about .about-text strong {
  color: var(--paper);
  font-weight: 600;
}
.page-about .about-more {
  margin: 18px 0 0;
}
.page-about .about-more a {
  display: inline-block;
  padding-bottom: 3px;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 197, 61, 0.4);
  transition: border-color 0.2s var(--ease);
}
.page-about .about-more a:hover,
.page-about .about-more a:focus-visible {
  border-bottom-color: var(--gold);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(24px, 3.6vw, 40px) 0 0;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--ink-800);
}
.page-about .about-figure--wide img {
  aspect-ratio: 16 / 9;
}
@media (min-width: 900px) {
  .page-about .about-figure--wide img {
    aspect-ratio: 16 / 6;
  }
}
.page-about .about-figure--map img {
  aspect-ratio: 7 / 5;
}
.page-about .about-figure--side {
  margin-top: clamp(22px, 3vw, 32px);
}
.page-about .about-figure--side img {
  aspect-ratio: 4 / 3;
}

/* ---------- 年份时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-bottom: 1px solid var(--line);
}
@media (min-width: 780px) {
  .page-about .about-timeline__item {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }
}
.page-about .about-timeline__year {
  font-size: clamp(34px, 5.6vw, 60px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}
.page-about .about-timeline__body {
  min-width: 0;
}
.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--paper);
}
.page-about .about-timeline__desc {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 校验批次 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 36px);
  margin-top: clamp(24px, 3.6vw, 36px);
}
@media (min-width: 980px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }
}
.page-about .about-batches {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  min-width: 0;
}
.page-about .about-batch {
  position: relative;
  padding: 18px 20px 16px;
  background: var(--ink-800);
  box-shadow: inset 0 0 0 1px var(--line);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
  transition: box-shadow 0.24s var(--ease), transform 0.24s var(--ease);
}
.page-about .about-batch:hover {
  box-shadow: inset 0 0 0 1px var(--gold);
  transform: translateY(-2px);
}
.page-about .about-batch[open] {
  box-shadow: inset 0 0 0 1px var(--gold);
}
.page-about .about-batch__summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  cursor: pointer;
  list-style: none;
}
.page-about .about-batch__summary::-webkit-details-marker {
  display: none;
}
.page-about .about-batch__label {
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}
.page-about .about-batch__value {
  flex: 0 0 auto;
  font-size: 14px;
  font-weight: 600;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}
.page-about .about-batch__note {
  margin: 14px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 团队标签页 ---------- */
.page-about .about-tabs {
  margin-top: clamp(24px, 3.6vw, 36px);
}
.page-about .about-tabs__bar {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  scrollbar-width: none;
}
.page-about .about-tabs__bar::-webkit-scrollbar {
  display: none;
}
.page-about .about-tab {
  flex: 0 0 auto;
  appearance: none;
  margin-bottom: -1px;
  padding: 12px 14px;
  background: transparent;
  border: 0;
  border-bottom: 3px solid transparent;
  font: inherit;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--steel);
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .about-tab:hover {
  color: var(--paper);
}
.page-about .about-tab[aria-selected="true"] {
  color: var(--gold);
  border-bottom-color: var(--gold);
}
.page-about .about-tabpanel {
  max-width: 68ch;
  padding-top: clamp(20px, 3vw, 30px);
  font-size: 16px;
  line-height: 1.9;
  color: var(--steel);
}
.page-about .about-tabpanel:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
}
.page-about .about-tabpanel p {
  margin: 0;
}

/* ---------- 覆盖版图 ---------- */
.page-about .about-coverage-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-top: 0;
}
.page-about .about-coverage-stats > div {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ink-850);
}
.page-about .about-coverage-num {
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 600;
  line-height: 1;
  color: var(--grass);
  font-variant-numeric: tabular-nums;
}
.page-about .about-coverage-lab {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}
.page-about .about-chips {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}
.page-about .about-chips li {
  padding: 14px 16px;
  background: var(--ink-800);
  box-shadow: inset 3px 0 0 0 var(--gold);
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}
.page-about .about-chips strong {
  display: block;
  margin-bottom: 5px;
  font-size: 14px;
  font-weight: 600;
  color: var(--paper);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(22px, 3.2vw, 32px);
}
@media (min-width: 780px) {
  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .about-partner {
  padding: clamp(20px, 3vw, 28px);
  background: linear-gradient(150deg, rgba(30, 58, 95, 0.55), rgba(19, 28, 46, 0.92));
  border-left: 3px solid var(--gold);
}
.page-about .about-partner h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 600;
  color: var(--paper);
}
.page-about .about-partner p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 收束入口 ---------- */
.page-about .about-cta {
  padding: clamp(28px, 4.4vw, 52px) clamp(22px, 4vw, 48px);
  background: linear-gradient(135deg, rgba(255, 197, 61, 0.14), rgba(11, 18, 32, 0) 62%);
  border: 1px solid var(--line);
  border-top: 3px solid var(--gold);
}
.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 36px);
  font-weight: 300;
  letter-spacing: -0.02em;
  color: var(--paper);
}
.page-about .about-cta__text {
  max-width: 60ch;
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
}
.page-about .about-cta__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-batch,
  .page-about .about-batch__summary,
  .page-about .about-tab,
  .page-about .about-ruler__list a,
  .page-about .about-ruler__list a::before,
  .page-about .about-more a,
  .page-about .about-crumb__list a {
    transition-duration: 0.01ms;
  }
  .page-about .about-batch:hover {
    transform: none;
  }
}