.page-about {
  --about-accent: var(--green);
  padding-bottom: 96px;
}

/* ---------- 面包屑与首屏 ---------- */
.page-about .breadcrumbs {
  padding-top: 20px;
}

.page-about .about-hero {
  padding: 22px 0 6px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  margin-top: 28px;
  align-items: end;
}

.page-about .about-hero h1 {
  font-size: clamp(28px, 6.2vw, 46px);
  line-height: 1.22;
  letter-spacing: -0.025em;
  font-weight: 700;
  margin: 14px 0 18px;
  max-width: 720px;
}

.page-about .about-hero__copy .lede {
  margin: 0;
  max-width: 620px;
  font-size: 16px;
  line-height: 1.88;
  color: var(--muted);
}

.page-about .about-hero__anchor {
  padding: 16px 0 16px 22px;
  border-left: 2px solid var(--green);
}

.page-about .about-hero__year {
  display: block;
  font-family: var(--mono);
  font-size: clamp(52px, 13vw, 84px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.05em;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__caption {
  display: block;
  margin-top: 12px;
  max-width: 240px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 64px;
  }
}

/* ---------- 主壳与章节索引 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding-top: 46px;
}

.page-about .about-toc {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  background: var(--glass);
}

.page-about .about-toc .toc__title {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-toc .toc__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-toc .toc__link {
  display: block;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.5;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-about .about-toc .toc__link:hover {
  color: var(--cyan);
  border-color: rgba(61, 220, 255, 0.5);
}

.page-about .about-toc .toc__link[aria-current="true"] {
  color: var(--green);
  border-color: rgba(0, 229, 160, 0.6);
  background: rgba(0, 229, 160, 0.08);
}

@media (min-width: 1080px) {
  .page-about .about-shell {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 58px;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--topbar-h) + var(--nav-h) + 26px);
    align-self: start;
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    background: none;
    padding: 2px 0 2px 18px;
  }

  .page-about .about-toc .toc__list {
    flex-direction: column;
    gap: 1px;
    margin-top: 14px;
  }

  .page-about .about-toc .toc__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 4px 0 4px 12px;
    font-size: 14px;
    line-height: 1.9;
    background: none;
  }

  .page-about .about-toc .toc__link[aria-current="true"] {
    border-left-color: var(--green);
    background: none;
  }
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-section {
  padding: 46px 0 6px;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: calc(var(--topbar-h) + var(--nav-h) + 18px);
}

.page-about .about-flow > .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .section-head {
  max-width: 640px;
  margin-bottom: 26px;
}

.page-about .section-title {
  font-size: clamp(22px, 3.8vw, 30px);
  line-height: 1.32;
  letter-spacing: -0.02em;
  font-weight: 700;
  margin: 10px 0 12px;
}

.page-about .section-head .lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

/* ---------- 品牌自述 ---------- */
.page-about .about-story {
  --about-accent: var(--green);
}

.page-about .about-story__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

@media (min-width: 900px) {
  .page-about .about-story__grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 46px;
    align-items: start;
  }
}

.page-about .about-story__copy h2 {
  margin-top: 10px;
}

.page-about .about-story__copy p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--muted);
}

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

.page-about .about-story__figure {
  margin: 0;
}

/* ---------- 发展历程 ---------- */
.page-about .about-roadmap {
  --about-accent: var(--cyan);
}

.page-about .about-roadmap__figure {
  margin: 0 0 30px;
}

.page-about .about-timeline {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 18px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--line) 72%);
  opacity: 0.65;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 28px 34px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--cyan);
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--green);
  transition: transform 0.2s ease;
}

.page-about .about-timeline__item:hover::after {
  transform: scale(1.6);
}

.page-about .about-timeline__head {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .about-timeline__year {
  font-family: var(--mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__stage {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-timeline__chev {
  margin-left: auto;
  flex: none;
  width: 8px;
  height: 8px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: rotate(45deg);
  transition: transform 0.22s ease;
}

.page-about .about-timeline__head[aria-expanded="false"] .about-timeline__chev {
  transform: rotate(-45deg);
}

.page-about .about-timeline__panel {
  margin-top: 10px;
  max-width: 620px;
}

.page-about .about-timeline__panel[hidden] {
  display: none;
}

.page-about .about-timeline__panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.88;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  --about-accent: var(--orange);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 720px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-team__card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.page-about .about-team__card--glass {
  background: var(--glass);
  backdrop-filter: blur(10px);
  border-color: rgba(61, 220, 255, 0.3);
}

.page-about .about-team__card--lead {
  border-color: rgba(255, 138, 61, 0.4);
}

.page-about .about-team__num {
  font-family: var(--mono);
  font-size: clamp(38px, 8vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

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

.page-about .about-team__card p {
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--muted);
}

/* ---------- 数据来源 ---------- */
.page-about .about-source {
  --about-accent: var(--green);
}

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

.page-about .about-source__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-source__index {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.95;
  color: var(--cyan);
}

.page-about .about-source__title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-source__item p {
  margin: 6px 0 0;
  max-width: 620px;
  font-size: 15px;
  line-height: 1.86;
  color: var(--muted);
}

/* ---------- 覆盖规模 ---------- */
.page-about .about-scale {
  --about-accent: var(--orange);
}

.page-about .about-scale__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--line-soft);
  overflow: hidden;
}

@media (min-width: 860px) {
  .page-about .about-scale__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-scale__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 22px 18px;
  background: var(--panel);
}

.page-about .about-scale__num {
  font-family: var(--mono);
  font-size: clamp(28px, 6vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.page-about .about-scale__item:first-child .about-scale__num {
  color: var(--orange);
}

.page-about .about-scale__unit {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--cyan);
}

.page-about .about-scale__note {
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-scale__tail {
  margin: 24px 0 0;
  max-width: 660px;
  font-size: 15px;
  line-height: 1.88;
  color: var(--muted);
}

.page-about .about-scale__tail a {
  color: var(--cyan);
  text-underline-offset: 3px;
}

.page-about .about-scale__tail a:hover {
  color: var(--green);
}

/* ---------- 运营主体 ---------- */
.page-about .about-operator {
  --about-accent: var(--cyan);
}

.page-about .about-operator__card {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 28px 22px;
}

@media (min-width: 760px) {
  .page-about .about-operator__card {
    padding: 40px 38px;
  }
}

.page-about .about-operator__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.22;
}

.page-about .about-operator__card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(115deg, rgba(7, 12, 27, 0.94), rgba(7, 12, 27, 0.6));
}

.page-about .about-operator__list {
  position: relative;
  z-index: 2;
  margin: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-operator__row {
  display: grid;
  gap: 3px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-operator__row dt {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-operator__row dd {
  margin: 4px 0 0;
  max-width: 620px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text);
}

/* ---------- 合作与联系 ---------- */
.page-about .about-partner {
  --about-accent: var(--green);
}

.page-about .about-partner__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 760px) {
  .page-about .about-partner__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-partner__card {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-partner__card:hover,
.page-about .about-partner__card:focus-visible {
  border-color: rgba(0, 229, 160, 0.55);
  transform: translateY(-2px);
}

.page-about .about-partner__tag {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--cyan);
}

.page-about .about-partner__title {
  margin-top: 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-partner__desc {
  flex: 1;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.82;
  color: var(--muted);
}

.page-about .about-partner__cta {
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--green);
  opacity: 0.78;
  transition: opacity 0.2s ease;
}

.page-about .about-partner__card:hover .about-partner__cta,
.page-about .about-partner__card:focus-visible .about-partner__cta {
  opacity: 1;
}

/* ---------- 动效收敛 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-partner__card,
  .page-about .about-partner__cta,
  .page-about .about-timeline__chev,
  .page-about .about-timeline__item::after,
  .page-about .about-toc .toc__link {
    transition: none;
  }

  .page-about .about-partner__card:hover,
  .page-about .about-partner__card:focus-visible {
    transform: none;
  }

  .page-about .about-timeline__item:hover::after {
    transform: none;
  }
}