.page-about {
  --about-rail: 236px;
  --about-gap: 64px;
  color: var(--text);
  padding-bottom: 88px;
  overflow-x: hidden;
}

/* ---------- 顶部条 ---------- */
.page-about .about-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 20px;
  padding: 22px 0 0;
  font-size: var(--fs-13);
  color: var(--muted);
}

.page-about .about-topbar .breadcrumb {
  font-size: var(--fs-13);
}

.page-about .about-topbar .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms ease, border-color 180ms ease;
}

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

.page-about .about-topbar .breadcrumb__sep {
  margin: 0 8px;
  color: var(--line);
}

.page-about .about-topbar__region {
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.04em;
  color: var(--muted);
  white-space: nowrap;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: 24px;
  padding: 44px 0 40px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 170% at 10% -30%, rgba(31, 169, 201, 0.24), transparent 62%),
    radial-gradient(90% 130% at 94% 130%, rgba(52, 226, 212, 0.11), transparent 58%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-size: var(--fs-13);
  letter-spacing: 0.14em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-size: var(--fs-40);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.24;
  color: var(--text);
  max-width: 20ch;
}

.page-about .about-hero__lead {
  margin: 0 0 28px;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--muted);
  max-width: 62ch;
}

.page-about .about-hero .signal-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 26px;
  padding: 12px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--glass);
  backdrop-filter: blur(6px);
}

.page-about .about-hero .signal {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-hero .signal__text {
  font-size: var(--fs-13);
  color: var(--muted);
}

.page-about .about-hero .signal__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 10px rgba(87, 214, 138, 0.7);
  flex: none;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  margin-top: 52px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
}

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) var(--about-rail);
    gap: var(--about-gap);
    align-items: start;
  }
}

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

/* ---------- 章节块 ---------- */
.page-about .about-section {
  padding-top: 44px;
}

.page-about .about-content > .about-section:first-child {
  padding-top: 0;
  border-top: none;
}

.page-about .about-section__num {
  display: block;
  margin-bottom: 12px;
  font-size: var(--fs-13);
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-section__title {
  margin: 0 0 18px;
  font-size: var(--fs-28);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--text);
}

.page-about .about-subtitle {
  margin: 40px 0 14px;
  font-size: var(--fs-21);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-section p {
  margin: 0 0 18px;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--text);
  max-width: 68ch;
}

.page-about .about-aside {
  padding: 16px 18px;
  border-left: 2px solid var(--cyan-deep);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: var(--glass);
  color: var(--muted) !important;
  font-size: var(--fs-15) !important;
}

.page-about .about-inline-link {
  font-size: var(--fs-15) !important;
  color: var(--muted) !important;
  padding-top: 6px;
}

.page-about .about-inline-link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(52, 226, 212, 0.35);
  transition: border-color 180ms ease;
}

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

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 32px;
}

.page-about .about-figure--flow {
  margin-top: 30px;
  margin-bottom: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-l);
  border: 1px solid var(--line);
  background: var(--panel);
  object-fit: cover;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 12px 0 12px 52px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 20px;
  bottom: 34px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line) 16%, var(--line) 84%, var(--cyan-deep) 100%);
}

.page-about .about-node {
  position: relative;
  padding-bottom: 28px;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -43px;
  top: 7px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--abyss);
  border: 1.5px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(52, 226, 212, 0.1), 0 0 16px rgba(52, 226, 212, 0.38);
}

.page-about .about-node__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 12px;
}

.page-about .about-node__ver {
  flex: none;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--glass);
}

.page-about .about-node__title {
  margin: 0;
  font-size: var(--fs-17);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.5;
  color: var(--text);
}

.page-about .about-node__note {
  margin: 9px 0 0;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--muted);
  max-width: 62ch;
}

@media (min-width: 900px) {
  .page-about .about-node__note {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 260ms ease, opacity 200ms ease, margin-top 260ms ease;
  }

  .page-about .about-node:hover .about-node__note,
  .page-about .about-node:focus-within .about-node__note {
    max-height: 180px;
    margin-top: 9px;
    opacity: 1;
  }
}

/* ---------- 团队条带 ---------- */
.page-about .about-team {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .about-team__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 8px;
}

.page-about .about-team__name {
  font-size: var(--fs-15);
  color: var(--text);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: var(--fs-15);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-team__track {
  display: block;
  height: 8px;
  border-radius: 999px;
  background: var(--panel-2);
  overflow: hidden;
}

.page-about .about-team__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--panel-2) 0%, var(--cyan-deep) 48%, var(--cyan) 100%);
}

.page-about .about-team__item:nth-child(1) .about-team__fill { width: 29%; }
.page-about .about-team__item:nth-child(2) .about-team__fill { width: 27%; }
.page-about .about-team__item:nth-child(3) .about-team__fill { width: 24%; }
.page-about .about-team__item:nth-child(4) .about-team__fill { width: 14%; }
.page-about .about-team__item:nth-child(5) .about-team__fill { width: 6%; }

.page-about .about-team .fold {
  margin-top: 10px;
}

.page-about .about-team .fold__head {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-13);
  color: var(--muted);
  cursor: pointer;
  list-style: none;
}

.page-about .about-team .fold__head::-webkit-details-marker {
  display: none;
}

.page-about .about-team .fold__head:hover {
  color: var(--cyan);
}

.page-about .about-team .fold__mark {
  display: inline-block;
  width: 14px;
  text-align: center;
  font-family: var(--font-mono);
  color: var(--cyan);
  transition: transform 240ms ease;
}

.page-about .about-team .fold[open] .fold__mark {
  transform: rotate(45deg);
}

.page-about .about-team .fold__body {
  padding: 4px 0 0 22px;
}

.page-about .about-team .fold__body p {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--muted);
  max-width: 62ch;
}

/* ---------- 审核链路 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

@media (min-width: 760px) {
  .page-about .about-flow {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
}

.page-about .about-flow__step {
  position: relative;
  padding: 20px 20px 18px;
  border: 1px dashed var(--line);
  border-radius: var(--radius-m);
  background: var(--glass);
}

.page-about .about-flow__step--manual {
  border-style: solid;
  border-color: rgba(52, 226, 212, 0.42);
}

.page-about .about-flow__idx {
  display: block;
  margin-bottom: 10px;
  font-size: var(--fs-13);
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-flow__label {
  display: block;
  margin-bottom: 8px;
  font-size: var(--fs-17);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--muted);
  max-width: 46ch;
}

/* ---------- 规模数据 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: 26px 0 20px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-stats__item {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 20px 18px 22px;
  background: var(--abyss);
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .about-stats__unit {
  margin-left: 3px;
  font-size: var(--fs-15);
  color: var(--cyan-deep);
}

.page-about .about-stats__label {
  font-size: var(--fs-13);
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 合作伙伴 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 26px 0 20px;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-partners__item {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-partners__tag {
  font-size: var(--fs-13);
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-partners__item p {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--muted);
  max-width: 66ch;
}

/* ---------- 结尾行动 ---------- */
.page-about .about-next {
  border-top: 1px solid var(--line);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

/* ---------- 右侧章节目录 ---------- */
.page-about .about-toc {
  display: none;
}

@media (min-width: 1080px) {
  .page-about .about-toc {
    display: block;
    position: sticky;
    top: 104px;
    padding-left: 22px;
    border-left: 1px solid var(--line);
  }
}

.page-about .about-toc__title {
  margin: 0 0 14px;
  font-size: var(--fs-13);
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-toc__link {
  display: block;
  padding: 6px 0 6px 12px;
  font-size: var(--fs-13);
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  margin-left: -13px;
  transition: color 180ms ease-out, border-color 180ms ease-out;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--text);
}

.page-about .about-toc__link[aria-current="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

.page-about .about-toc__foot {
  margin: 20px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 窄屏收口 ---------- */
@media (max-width: 640px) {
  .page-about {
    padding-bottom: 64px;
  }

  .page-about .about-hero {
    padding: 34px 0 30px;
  }

  .page-about .about-body {
    margin-top: 36px;
  }

  .page-about .about-section {
    padding-top: 34px;
  }

  .page-about .about-timeline {
    padding-left: 40px;
  }

  .page-about .about-timeline::before {
    left: 12px;
  }

  .page-about .about-node::before {
    left: -35px;
    width: 12px;
    height: 12px;
  }

  .page-about .about-hero .signal-bar {
    gap: 8px 18px;
    padding: 12px 14px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .about-node__note,
  .page-about .about-team .fold__mark,
  .page-about .about-topbar .breadcrumb a,
  .page-about .about-inline-link a {
    transition: none;
  }

  .page-about .about-node__note {
    max-height: none;
    opacity: 1;
    margin-top: 9px;
  }
}