.page-about {
  --about-grid: 24px;
  --about-net: rgba(143, 169, 161, 0.085);
  position: relative;
  background-color: var(--ink-800);
  color: var(--paper);
  overflow-x: clip;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--about-net) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-net) 1px, transparent 1px);
  background-size: var(--about-grid) var(--about-grid);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero {
  position: relative;
  z-index: 1;
  padding: calc(var(--header-h) + 40px) 0 clamp(40px, 6vw, 72px);
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(28, 142, 119, 0.30), transparent 62%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
}

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

.page-about .about-crumb {
  margin-bottom: 28px;
}

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

.page-about .about-hero__label {
  display: inline-block;
  margin: 0 0 20px;
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 18em;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(30px, 6.2vw, 72px);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.8;
  color: var(--paper);
  opacity: 0.78;
}

.page-about .about-collage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  margin-top: clamp(32px, 5vw, 56px);
}

.page-about .about-figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background-color: var(--ink-900);
}

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

.page-about .about-media--hero img { aspect-ratio: 16 / 9; }
.page-about .about-media--arch img { aspect-ratio: 3 / 2; }
.page-about .about-media--team img { aspect-ratio: 14 / 9; }

.page-about .about-figure__caption {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 1px solid var(--line-cyan);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  max-width: 52ch;
}

.page-about .about-collage__stats {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-width: 0;
}

.page-about .about-stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(38px, 5.4vw, 60px);
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .about-stat--gold .about-stat__num { color: var(--gold); }
.page-about .about-stat--cyan .about-stat__num { color: var(--cyan); }
.page-about .about-stat--plain .about-stat__num { color: var(--paper); }

.page-about .about-stat__label {
  flex: 1 1 100%;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* 主体骨架 */
.page-about .about-body {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding-top: clamp(40px, 6vw, 72px);
  padding-bottom: clamp(40px, 6vw, 72px);
}

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

/* 章节索引 */
.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .index-rail__item {
  min-width: 0;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid var(--line-soft);
  color: var(--mist);
  font-size: 12px;
  text-decoration: none;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

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

.page-about .about-rail__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--jade);
}

/* 章节 */
.page-about .about-sec {
  padding-top: clamp(32px, 5vw, 56px);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-sec:first-child {
  padding-top: 0;
}

.page-about .about-sec__head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .section__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3vw, 38px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .about-sec__title {
  margin: 0;
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.page-about .about-sec__eyebrow {
  margin: 10px 0 0;
  color: var(--mist);
}

.page-about .about-lead {
  margin: 0 0 clamp(20px, 3vw, 28px);
  max-width: 62ch;
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.8;
  color: var(--paper);
  opacity: 0.82;
}

.page-about .about-prose {
  max-width: 68ch;
}

.page-about .about-prose p {
  margin: 0 0 18px;
  font-size: clamp(15px, 1.02vw, 16px);
  line-height: 1.85;
  color: rgba(241, 246, 243, 0.8);
}

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

/* 数据资产 */
.page-about .about-assets {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-asset {
  min-width: 0;
  padding: clamp(20px, 2.4vw, 28px);
}

.page-about .about-asset__value {
  margin: 14px 0 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(42px, 6vw, 68px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-asset__title {
  margin: 0 0 10px;
  font-size: clamp(17px, 1.6vw, 21px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-asset__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

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

/* 团队标签页 */
.page-about .about-tabs {
  margin-top: clamp(20px, 3vw, 28px);
}

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

.page-about .about-duty {
  margin: 0;
  padding: 0;
  list-style: none;
  max-width: 68ch;
}

.page-about .about-duty li {
  position: relative;
  padding: 12px 0 12px 24px;
  border-top: 1px solid var(--line-soft);
  font-size: clamp(14px, 1vw, 16px);
  line-height: 1.8;
  color: rgba(241, 246, 243, 0.8);
}

.page-about .about-duty li:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-duty li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 8px;
  height: 2px;
  background-color: var(--cyan);
}

.page-about .about-team__figure {
  margin-top: clamp(28px, 4vw, 40px);
}

/* 服务对象 */
.page-about .about-audience {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-audience__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: clamp(20px, 2.6vw, 28px) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-audience__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-audience__name {
  margin: 0;
  font-size: clamp(17px, 1.7vw, 21px);
  font-weight: 600;
  line-height: 1.4;
}

.page-about .about-audience__text {
  margin: 0;
  font-size: clamp(14px, 1vw, 16px);
  line-height: 1.85;
  color: rgba(241, 246, 243, 0.78);
}

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  padding-bottom: 1px;
  transition: color 180ms var(--ease);
}

.page-about .about-inline-link:hover {
  color: var(--gold-lt);
}

/* 时间线 */
.page-about .about-timeline__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 0;
  padding: 0 0 0 20px;
  list-style: none;
  border-left: 1px solid var(--line-cyan);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 28px;
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: -24px;
  top: 8px;
  width: 8px;
  height: 8px;
  background-color: var(--gold);
  transform: rotate(45deg);
  transition: background-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 4.4vw, 52px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
  transition: color 200ms var(--ease);
}

.page-about .about-timeline__name {
  margin: 10px 0 6px;
  font-size: clamp(16px, 1.5vw, 19px);
  font-weight: 600;
  line-height: 1.4;
}

.page-about .about-timeline__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-timeline__item:hover .about-timeline__dot,
.page-about .about-timeline__item:focus-within .about-timeline__dot {
  background-color: var(--cyan);
  box-shadow: 0 0 0 6px rgba(59, 240, 196, 0.14);
}

.page-about .about-timeline__item:hover .about-timeline__year,
.page-about .about-timeline__item:focus-within .about-timeline__year {
  color: var(--gold-lt);
}

/* 合作生态 */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .about-partners__stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
}

.page-about .about-partner-num {
  border: 1px solid var(--line);
  padding: clamp(18px, 2.2vw, 24px);
  background: linear-gradient(180deg, var(--ink-700), var(--ink-800));
}

.page-about .about-partner-num__v {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(40px, 5vw, 56px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-partner-num__l {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-partners__text p {
  margin: 0 0 16px;
  font-size: clamp(14px, 1vw, 16px);
  line-height: 1.85;
  color: rgba(241, 246, 243, 0.8);
}

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

/* 结尾区块 */
.page-about .about-closing {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line-cyan);
  background:
    radial-gradient(95% 130% at 82% 0%, rgba(28, 142, 119, 0.38), transparent 64%),
    linear-gradient(165deg, var(--ink-700) 0%, var(--ink-800) 52%, var(--ink-900) 100%);
}

.page-about .about-closing__inner {
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-about .about-closing__label {
  display: inline-block;
  margin: 0 0 18px;
}

.page-about .about-closing__title {
  margin: 0;
  max-width: 20em;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(26px, 4.4vw, 50px);
  line-height: 1.2;
  color: var(--paper);
}

.page-about .about-closing__text {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: clamp(14px, 1vw, 16px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

@media (min-width: 760px) {
  .page-about .about-audience__item {
    grid-template-columns: 44px minmax(0, 200px) minmax(0, 1fr);
    align-items: baseline;
    column-gap: 24px;
    row-gap: 0;
  }

  .page-about .about-audience__idx {
    grid-row: 1;
  }

  .page-about .about-audience__name {
    grid-row: 1;
  }

  .page-about .about-audience__text {
    grid-row: 1;
  }

  .page-about .about-partner-num {
    display: flex;
    align-items: baseline;
    gap: 20px;
  }

  .page-about .about-partner-num__l {
    margin-top: 0;
    flex: 1 1 auto;
  }
}

@media (min-width: 820px) {
  .page-about .about-timeline__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    padding-left: 0;
    border-left: 0;
    border-top: 1px solid var(--line-cyan);
  }

  .page-about .about-timeline__item {
    padding: 30px 20px 12px;
    border-left: 1px solid var(--line-soft);
  }

  .page-about .about-timeline__item:first-child {
    border-left: 0;
  }

  .page-about .about-timeline__dot {
    left: 20px;
    top: -4px;
  }
}

@media (min-width: 900px) {
  .page-about .about-collage {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .about-collage__stats {
    transform: translateY(-36px);
  }

  .page-about .about-assets {
    grid-template-columns: minmax(0, 5fr) minmax(0, 4fr) minmax(0, 3fr);
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 4fr) minmax(0, 6fr);
    gap: 48px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--rail) minmax(0, 1fr);
    gap: 48px;
  }

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

  .page-about .about-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }

  .page-about .about-rail__link {
    display: flex;
    width: 100%;
    padding: 10px 0;
    border: 0;
    border-top: 1px solid var(--line-soft);
    background: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-collage__stats {
    transform: none;
  }

  .page-about .about-rail__link,
  .page-about .about-timeline__dot,
  .page-about .about-timeline__year,
  .page-about .about-inline-link {
    transition: none;
  }
}