.page-about {
  --ab-ink: var(--sl-ink);
  --ab-ink-soft: #223052;
  --ab-line: rgba(11, 18, 32, 0.14);
  --ab-line-strong: rgba(11, 18, 32, 0.3);
  --ab-surface: rgba(255, 255, 255, 0.46);
  background-color: var(--sl-paper);
  background-image: repeating-linear-gradient(
    135deg,
    rgba(11, 18, 32, 0.022) 0 1px,
    transparent 1px 8px
  );
  color: var(--ab-ink);
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about a {
  color: #16406b;
  text-decoration: none;
  border-bottom: 1px solid rgba(22, 64, 107, 0.34);
  transition: border-color 120ms ease, color 120ms ease;
}

.page-about a:hover {
  color: var(--sl-ink-deep);
  border-bottom-color: var(--sl-cyan);
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  padding-top: clamp(16px, 2.4vw, 28px);
}

/* ---------- 索引条 ---------- */
.page-about .ab-indexbar {
  background: var(--sl-ink);
  border-bottom: 1px solid var(--sl-ink-deep);
  margin-top: clamp(12px, 2vw, 22px);
}

.page-about .ab-indexbar .sl-index-strip__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
  padding-block: 12px;
}

.page-about .ab-indexbar .sl-index-label {
  color: var(--sl-slate);
  flex: none;
}

.page-about .ab-index-list {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-index-list::-webkit-scrollbar {
  display: none;
}

.page-about .ab-index-list li {
  flex: none;
}

.page-about .ab-index-list a {
  display: block;
  padding: 4px 14px;
  font-family: var(--sl-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--sl-slate);
  border: none;
  border-left: 1px solid rgba(138, 154, 180, 0.24);
  white-space: nowrap;
}

.page-about .ab-index-list li:first-child a {
  border-left: none;
}

.page-about .ab-index-list a:hover,
.page-about .ab-index-list a[data-active] {
  color: var(--sl-cyan);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
  padding-top: clamp(36px, 6vw, 84px);
  padding-bottom: clamp(28px, 4vw, 48px);
}

.page-about .ab-kicker {
  color: #5a6785;
}

.page-about .ab-hero__title {
  font-size: clamp(34px, 7.4vw, 70px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--sl-ink-deep);
  margin: clamp(12px, 1.6vw, 20px) 0 clamp(16px, 2.2vw, 26px);
}

.page-about .ab-hero__intro {
  max-width: 34em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--ab-ink-soft);
  margin: 0 0 16px;
}

.page-about .ab-hero__intro--sub {
  font-size: 15px;
  color: #52617f;
  border-left: 2px solid var(--sl-cyan);
  padding-left: 14px;
  margin-bottom: 0;
}

.page-about .ab-hero__aside .sl-figure__media {
  border: 1px solid var(--ab-line-strong);
}

/* ---------- 首屏事实条 ---------- */
.page-about .ab-factbar {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--ab-line-strong);
  border-bottom: 1px solid var(--ab-line-strong);
}

.page-about .ab-factbar li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 2px;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-factbar li:last-child {
  border-bottom: none;
}

.page-about .ab-factbar__k {
  font-family: var(--sl-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: #5a6785;
}

.page-about .ab-factbar__v {
  font-family: var(--sl-font-mono);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  color: var(--sl-ink-deep);
  font-weight: 600;
}

/* ---------- 区块骨架 ---------- */
.page-about .ab-sec {
  padding-top: clamp(46px, 6.5vw, 92px);
  border-top: 1px solid var(--ab-line);
  margin-top: clamp(32px, 5vw, 68px);
}

.page-about .ab-sec__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2vw, 28px);
}

.page-about .ab-sec__no {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  font-family: var(--sl-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: #5a6785;
  border-bottom: 1px solid var(--ab-line);
  padding-bottom: 10px;
}

.page-about .ab-sec__no .sl-mono {
  color: var(--sl-purple);
  font-weight: 700;
}

.page-about .sl-h2 {
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--sl-ink-deep);
  margin: 0 0 clamp(14px, 1.8vw, 22px);
}

.page-about .sl-h3 {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--sl-ink-deep);
  margin: 0 0 8px;
}

.page-about .sl-prose {
  max-width: 38em;
}

.page-about .sl-prose p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.82;
  color: var(--ab-ink-soft);
}

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

.page-about .ab-lede {
  max-width: 38em;
  font-size: 16px;
  line-height: 1.8;
  color: #46567a;
  margin: 0 0 clamp(20px, 2.6vw, 30px);
}

.page-about .ab-note-inline {
  max-width: 38em;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: #52617f;
}

.page-about .ab-subhead {
  margin-top: clamp(30px, 4vw, 48px);
}

/* ---------- 表格 ---------- */
.page-about .ab-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--ab-line-strong);
  background: var(--ab-surface);
  margin-bottom: clamp(20px, 2.6vw, 32px);
}

.page-about .ab-table {
  width: 100%;
  min-width: 580px;
  border-collapse: collapse;
  font-size: 15px;
}

.page-about .ab-table__cap {
  caption-side: top;
  text-align: left;
  padding: 12px 16px;
  font-family: var(--sl-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: #5a6785;
  border-bottom: 1px dashed var(--ab-line-strong);
}

.page-about .ab-table thead th {
  background: var(--sl-ink);
  color: var(--sl-silver);
  font-family: var(--sl-font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-align: left;
  padding: 11px 16px;
  border-bottom: 2px solid var(--sl-cyan);
  white-space: nowrap;
}

.page-about .ab-table tbody th {
  width: 32%;
  text-align: left;
  font-family: var(--sl-font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--sl-ink-deep);
  padding: 14px 16px;
  border-bottom: 1px solid var(--ab-line);
  vertical-align: top;
}

.page-about .ab-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--ab-line);
  color: var(--ab-ink-soft);
  line-height: 1.75;
  vertical-align: top;
}

.page-about .ab-table tbody tr:last-child th,
.page-about .ab-table tbody tr:last-child td {
  border-bottom: none;
}

.page-about .ab-table tbody tr {
  transition: background-color 140ms ease;
}

.page-about .ab-table tbody tr:hover {
  background-color: rgba(110, 90, 200, 0.1);
}

.page-about .ab-table tbody tr:hover th {
  color: #3a2c86;
}

.page-about .ab-figure-block {
  margin: clamp(24px, 3.4vw, 44px) 0 0;
}

/* ---------- 三条规矩 ---------- */
.page-about .ab-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .ab-rule {
  position: relative;
  background: var(--ab-surface);
  border: 1px solid var(--ab-line-strong);
  clip-path: var(--sl-notch);
  padding: 20px 22px 26px;
  transition: transform 150ms ease, border-color 150ms ease;
}

.page-about .ab-rule:hover {
  transform: translateY(-2px);
  border-color: var(--sl-cyan);
}

.page-about .ab-rule__idx {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--sl-purple);
  margin-bottom: 10px;
}

.page-about .ab-rule p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-ink-soft);
}

/* ---------- 团队四象限 ---------- */
.page-about .ab-quads {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(12px, 1.8vw, 18px);
}

.page-about .ab-quad {
  background: var(--ab-surface);
  border: 1px solid var(--ab-line-strong);
  border-left: 3px solid var(--sl-purple);
  transition: border-color 150ms ease, background-color 150ms ease;
}

.page-about .ab-quad[open] {
  border-left-color: var(--sl-cyan);
  background: rgba(255, 255, 255, 0.66);
}

.page-about .ab-quad summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  color: var(--sl-ink-deep);
}

.page-about .ab-quad summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-quad__plus {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
}

.page-about .ab-quad__plus::before,
.page-about .ab-quad__plus::after {
  content: "";
  position: absolute;
  background: var(--sl-ink);
  transition: transform 160ms ease;
}

.page-about .ab-quad__plus::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-about .ab-quad__plus::after {
  top: 0;
  left: 6px;
  width: 2px;
  height: 14px;
}

.page-about .ab-quad[open] .ab-quad__plus::after {
  transform: scaleY(0);
}

.page-about .ab-quad p {
  margin: 0;
  padding: 0 18px 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-ink-soft);
}

/* ---------- 审核流程 ---------- */
.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--ab-line-strong);
  border: 1px solid var(--ab-line-strong);
}

.page-about .ab-flow li {
  background: var(--sl-paper);
  padding: 16px 18px;
  display: grid;
  gap: 4px;
}

.page-about .ab-flow__n {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: #5a6785;
}

.page-about .ab-flow strong {
  font-size: 15px;
  color: var(--sl-ink-deep);
}

.page-about .ab-flow span:last-child {
  font-size: 14px;
  line-height: 1.75;
  color: #52617f;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 34px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 26px;
  width: 2px;
  background: linear-gradient(180deg, var(--sl-purple) 0%, var(--sl-purple) 55%, rgba(47, 243, 213, 0.9) 100%);
}

.page-about .ab-tl-item {
  position: relative;
  padding-bottom: clamp(22px, 3vw, 34px);
}

.page-about .ab-tl-item:last-child {
  padding-bottom: 0;
}

.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  left: -33px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--sl-paper);
  border: 2px solid var(--sl-purple);
  transition: background-color 150ms ease, border-color 150ms ease, transform 150ms ease;
}

.page-about .ab-tl-item:hover::before {
  background: var(--sl-cyan);
  border-color: var(--sl-ink-deep);
  transform: scale(1.18);
}

.page-about .ab-tl-stage {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: #5a6785;
  border: 1px solid var(--ab-line-strong);
  padding: 3px 9px;
  margin: 0 0 9px;
}

.page-about .ab-tl-item:hover .ab-tl-stage {
  color: #3a2c86;
  border-color: var(--sl-purple);
}

.page-about .ab-tl-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-ink-soft);
}

.page-about .ab-tl-item .ab-tl-key {
  margin-top: 8px;
  font-family: var(--sl-font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: #5a6785;
}

/* ---------- 合作生态 ---------- */
.page-about .ab-eco {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2vw, 22px);
}

.page-about .ab-eco__item {
  border-top: 2px solid var(--sl-ink-deep);
  padding-top: 16px;
}

.page-about .ab-eco__tag {
  display: inline-block;
  font-family: var(--sl-font-mono);
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--sl-ember);
  margin: 0 0 10px;
}

.page-about .ab-eco__item p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-ink-soft);
}

.page-about .ab-eco__foot {
  margin-top: clamp(22px, 3vw, 34px);
  padding: 18px 20px;
  background: var(--sl-ink);
  clip-path: var(--sl-notch);
}

.page-about .ab-eco__foot p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sl-silver);
  max-width: 42em;
}

.page-about .ab-eco__foot a {
  color: var(--sl-cyan);
  border-bottom-color: rgba(47, 243, 213, 0.45);
}

.page-about .ab-eco__foot a:hover {
  color: #ffffff;
  border-bottom-color: var(--sl-ember);
}

/* ---------- 收束 ---------- */
.page-about .ab-closing {
  margin: clamp(40px, 6vw, 76px) 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--ab-line-strong);
  max-width: 46em;
  font-size: 13px;
  line-height: 1.9;
  letter-spacing: 0.03em;
  color: #52617f;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-factbar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(18px, 3vw, 40px);
  }

  .page-about .ab-factbar li:nth-child(odd) {
    border-right: 1px solid var(--ab-line);
    padding-right: clamp(18px, 3vw, 40px);
  }

  .page-about .ab-factbar li:nth-last-child(-n + 2) {
    border-bottom: none;
  }

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

  .page-about .ab-rules li:first-child {
    grid-column: 1 / -1;
  }

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

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

@media (min-width: 900px) {
  .page-about .ab-hero {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
    column-gap: clamp(36px, 5vw, 76px);
  }

  .page-about .ab-hero__lead {
    padding-top: clamp(8px, 2vw, 26px);
  }

  .page-about .ab-sec__grid {
    grid-template-columns: minmax(120px, 2fr) minmax(0, 9fr);
    column-gap: clamp(24px, 4vw, 60px);
  }

  .page-about .ab-sec__no {
    display: block;
    border-bottom: none;
    border-left: 2px solid var(--sl-purple);
    padding: 0 0 0 12px;
    position: sticky;
    top: 96px;
  }

  .page-about .ab-sec__no .sl-mono {
    display: block;
    margin-bottom: 6px;
  }

  .page-about .ab-sec__no span:last-child {
    font-family: var(--sl-font-body);
    letter-spacing: 0.06em;
    font-size: 13px;
    color: #46567a;
  }

  .page-about .ab-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .ab-figure-block {
    max-width: 72%;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-sec__grid {
    grid-template-columns: minmax(150px, 1.6fr) minmax(0, 8.4fr);
  }

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

  .page-about .ab-rules li:first-child {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about a,
  .page-about .ab-rule,
  .page-about .ab-tl-item::before,
  .page-about .ab-quad,
  .page-about .ab-quad__plus::after {
    transition: none;
  }

  .page-about .ab-rule:hover,
  .page-about .ab-tl-item:hover::before {
    transform: none;
  }
}