.page-about {
  --about-rail: 200px;
  display: block;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-top: 44px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -190px;
  right: -140px;
  width: min(860px, 92vw);
  height: 740px;
  background:
    radial-gradient(circle at 62% 36%, rgba(28, 61, 110, 0.92), rgba(10, 23, 48, 0) 68%),
    radial-gradient(circle at 28% 76%, rgba(91, 224, 208, 0.12), rgba(10, 23, 48, 0) 62%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 26px;
}

.page-about .about-hero-title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 66px);
  line-height: 1.14;
  letter-spacing: 0.02em;
  color: var(--stardust);
  max-width: 18ch;
}

.page-about .about-hero-lede {
  margin: 26px 0 0;
  max-width: 58ch;
  color: var(--mist);
}

.page-about .about-figures {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hairline-soft);
  border: 1px solid var(--hairline-soft);
}

.page-about .about-figure {
  background: var(--deep-space);
  padding: 22px 18px 24px;
  display: grid;
  gap: 8px;
}

.page-about .about-figure-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 2.8vw, 32px);
  letter-spacing: 0.04em;
  color: var(--star-gold);
  line-height: 1;
}

.page-about .about-figure-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-cover {
  margin: 52px 0 0;
}

.page-about .about-cover-caption {
  margin-top: 14px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--orbit-gray);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  margin-top: 88px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
}

.page-about .about-col {
  min-width: 0;
}

/* ---------- 侧栏目录 ---------- */
.page-about .about-toc {
  display: none;
}

.page-about .about-toc-title {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--orbit-gray);
}

.page-about .about-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-toc-link {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px solid var(--hairline-soft);
  color: var(--mist);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.55;
  transition: color 0.22s ease, border-color 0.22s ease;
}

.page-about .about-toc-link:hover,
.page-about .about-toc-link:focus-visible {
  color: var(--star-gold);
  border-bottom-color: var(--star-gold);
}

.page-about .about-toc-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--orbit-gray);
}

/* ---------- 章节 ---------- */
.page-about .about-block {
  padding-bottom: 96px;
  scroll-margin-top: 96px;
}

.page-about .about-block + .about-block {
  border-top: 1px solid var(--hairline-soft);
  padding-top: 84px;
}

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

.page-about .about-head {
  display: grid;
  gap: 12px;
  margin-bottom: 40px;
}

.page-about .about-index {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--star-gold);
}

.page-about .about-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 2.5vw, 32px);
  line-height: 1.32;
  letter-spacing: 0.02em;
  color: var(--stardust);
}

.page-about .about-note {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--orbit-gray);
}

.page-about .about-copy {
  margin: 0 0 20px;
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.9;
  color: var(--mist);
}

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

/* ---------- 01 事实三栏 ---------- */
.page-about .about-facts {
  margin-top: 44px;
  display: grid;
  gap: 1px;
  background: var(--hairline-soft);
  border-top: 1px solid var(--hairline-soft);
  border-bottom: 1px solid var(--hairline-soft);
}

.page-about .about-fact {
  background: var(--deep-space);
  padding: 26px 22px 28px;
}

.page-about .about-fact-title {
  margin: 0 0 12px;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--star-gold);
}

.page-about .about-fact p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 02 时间轴 ---------- */
.page-about .about-timeline-wrap {
  position: relative;
}

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

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-node {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  padding: 30px 0;
  border-bottom: 1px solid var(--hairline-soft);
}

.page-about .about-node:first-child {
  border-top: 1px solid var(--hairline-soft);
}

.page-about .about-node-year {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 27px);
  letter-spacing: 0.04em;
  color: var(--star-gold);
}

.page-about .about-node-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.45;
  letter-spacing: 0.02em;
  color: var(--stardust);
}

.page-about .about-node-body > p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-node-more {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  margin-top: 0;
  transition: grid-template-rows 0.42s ease, opacity 0.42s ease, margin-top 0.42s ease;
}

.page-about .about-node-more > p {
  overflow: hidden;
  min-height: 0;
  margin: 0;
  padding-left: 14px;
  border-left: 1px solid var(--hairline);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--orbit-gray);
}

.page-about .about-node:hover .about-node-more,
.page-about .about-node:focus-within .about-node-more {
  grid-template-rows: 1fr;
  opacity: 1;
  margin-top: 14px;
}

@media (hover: none) {
  .page-about .about-node-more {
    grid-template-rows: 1fr;
    opacity: 1;
    margin-top: 14px;
  }
}

/* ---------- 03 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 36px;
}

.page-about .about-team-copy p {
  margin: 0 0 20px;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-team-copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-team-caption,
.page-about .about-data-caption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  line-height: 1.7;
  color: var(--orbit-gray);
}

/* ---------- 04 数据链路 ---------- */
.page-about .about-chain {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hairline-soft);
  border: 1px solid var(--hairline-soft);
}

.page-about .about-chain-step {
  background: var(--night-blue);
  padding: 26px 22px 30px;
}

.page-about .about-chain-kicker {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--aurora);
}

.page-about .about-chain-title {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.45;
  color: var(--stardust);
}

.page-about .about-chain-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-data-media {
  margin: 44px 0 40px;
  max-width: 560px;
}

.page-about .about-lines {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hairline-soft);
  border-top: 1px solid var(--hairline-soft);
}

.page-about .about-line {
  display: grid;
  gap: 6px;
  padding: 22px 4px;
  background: var(--deep-space);
  border-bottom: 1px solid var(--hairline-soft);
  text-decoration: none;
  transition: background-color 0.22s ease, padding-left 0.22s ease;
}

.page-about .about-line:hover,
.page-about .about-line:focus-visible {
  background: var(--night-blue);
  padding-left: 14px;
}

.page-about .about-line-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--stardust);
}

.page-about .about-line-desc {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 05 认可与协作 ---------- */
.page-about .about-honor {
  margin-top: 4px;
}

.page-about .about-honor .tabs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.page-about .about-honor .tab {
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  border: 1px solid var(--hairline);
  color: var(--mist);
  font-family: var(--font-sans);
  font-size: 14px;
  letter-spacing: 0.06em;
  padding: 10px 18px;
  cursor: pointer;
  transition: color 0.22s ease, border-color 0.22s ease, background-color 0.22s ease;
}

.page-about .about-honor .tab:hover {
  color: var(--stardust);
  border-color: var(--orbit-gray);
}

.page-about .about-honor .tab[aria-selected="true"] {
  color: var(--deep-space);
  background: var(--star-gold);
  border-color: var(--star-gold);
}

.page-about .about-honor .tab:focus-visible {
  outline: 2px solid var(--aurora);
  outline-offset: 2px;
}

.page-about .about-honor-panel:focus-visible {
  outline: 2px solid var(--aurora);
  outline-offset: 4px;
}

.page-about .about-honor-grid {
  display: grid;
  gap: 16px;
}

.page-about .about-honor-card {
  border: 1px solid rgba(91, 224, 208, 0.42);
  background: var(--night-blue);
  padding: 26px 22px 28px;
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-honor-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 24px;
  letter-spacing: 0.02em;
  color: var(--aurora);
  line-height: 1;
}

.page-about .about-honor-title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 16px;
  line-height: 1.6;
  color: var(--stardust);
}

.page-about .about-honor-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 06 承诺 ---------- */
.page-about .about-promises {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-promise {
  display: grid;
  gap: 10px;
  padding: 28px 0;
  border-bottom: 1px solid var(--hairline-soft);
}

.page-about .about-promise:first-child {
  border-top: 1px solid var(--hairline-soft);
}

.page-about .about-promise-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.14em;
  color: var(--signal-orange);
}

.page-about .about-promise-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  letter-spacing: 0.02em;
  color: var(--stardust);
}

.page-about .about-promise p {
  margin: 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-next {
  margin-top: 64px;
  padding-top: 40px;
  border-top: 1px solid var(--star-gold);
  display: grid;
  gap: 24px;
}

.page-about .about-next-line {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

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

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

  .page-about .about-promise {
    grid-template-columns: 58px minmax(0, 1fr);
    column-gap: 28px;
    align-items: baseline;
  }

  .page-about .about-promise-num {
    grid-row: 1 / span 2;
  }
}

@media (min-width: 860px) {
  .page-about .about-head {
    grid-template-columns: auto minmax(0, 1fr);
    grid-template-rows: auto auto;
    column-gap: 24px;
    row-gap: 10px;
    align-items: baseline;
  }

  .page-about .about-index {
    grid-row: 1 / span 2;
    align-self: start;
  }

  .page-about .about-title {
    grid-column: 2;
  }

  .page-about .about-note {
    grid-column: 2;
  }

  .page-about .about-timeline-wrap {
    padding-left: 0;
  }

  .page-about .about-track {
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 48px;
    opacity: 0.7;
    pointer-events: none;
  }

  .page-about .about-node {
    grid-template-columns: 96px minmax(0, 1fr);
    column-gap: 36px;
    padding: 38px 0 38px 64px;
  }

  .page-about .about-node::before {
    content: "";
    position: absolute;
    left: 22px;
    top: 46px;
    width: 6px;
    height: 6px;
    background: var(--star-gold);
  }
}

@media (min-width: 1000px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .about-team-media {
    margin-left: -44px;
    margin-top: 32px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) var(--about-rail);
    gap: 72px;
    align-items: start;
  }

  .page-about .about-toc {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
    padding-top: 18px;
    border-top: 1px solid var(--star-gold);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node-more,
  .page-about .about-line,
  .page-about .about-toc-link,
  .page-about .about-honor .tab {
    transition: none;
  }
}