.page-about {
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding: clamp(16px, 2.4vw, 26px) 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-crumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--fox);
  border-bottom-color: var(--fox);
}

.page-about .about-crumbs [aria-current="page"] {
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-lead {
  padding: clamp(30px, 4.4vw, 60px) 0 0;
}

.page-about .lead-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .lead-rail,
.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--mist);
}

.page-about .about-index {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--fox);
}

.page-about .about-h1 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(34px, 6.2vw, 80px);
  line-height: 1.04;
  letter-spacing: .005em;
  max-width: 18ch;
}

.page-about .lead-text {
  margin: clamp(22px, 3vw, 34px) 0 0;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.62;
}

.page-about .lead-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 22px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .lead-actions .link-more {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--ink);
  text-decoration: none;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--grey);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .lead-actions .link-more:hover,
.page-about .lead-actions .link-more:focus-visible {
  color: var(--fox-deep);
  border-bottom-color: var(--fox);
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.74) contrast(1.06);
}

.page-about .lead-figure {
  margin-top: clamp(30px, 4.4vw, 58px);
  max-height: 62vh;
  overflow: hidden;
}

.page-about .lead-figure img {
  max-height: 62vh;
}

/* ---------- 区块骨架 ---------- */
.page-about .about-block {
  padding: clamp(50px, 7vw, 104px) 0;
  border-top: 1px solid var(--grey);
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

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

.page-about .about-h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(27px, 4.2vw, 54px);
  line-height: 1.06;
  max-width: 22ch;
}

.page-about .block-text {
  margin-top: clamp(20px, 2.8vw, 30px);
  max-width: 62ch;
}

.page-about .block-text p {
  margin: 0 0 1em;
  font-size: 16.5px;
  line-height: 1.62;
}

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

.page-about .block-text a {
  color: var(--fox-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--fox);
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .block-text a:hover,
.page-about .block-text a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* ---------- 01 规模数据 ---------- */
.page-about .scale-stats {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grey);
  border: 1px solid var(--grey);
}

.page-about .scale-stats li {
  background: var(--cream);
  padding: 20px 16px 22px;
}

.page-about .scale-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(23px, 2.6vw, 34px);
  line-height: 1;
  letter-spacing: -.01em;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.page-about .scale-stats li:first-child .scale-num {
  color: var(--fox);
}

.page-about .scale-cap {
  display: block;
  margin-top: 10px;
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--mist);
}

/* ---------- 02 三条业务线 ---------- */
.page-about .line-list {
  list-style: none;
  margin: clamp(28px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--grey);
  border-top: 1px solid var(--grey);
  border-bottom: 1px solid var(--grey);
}

.page-about .line-item {
  background: var(--cream);
  padding: 26px 20px 30px;
  transition: background-color var(--dur) var(--ease);
}

.page-about .line-item:hover {
  background: var(--paper);
}

.page-about .line-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--fox);
}

.page-about .line-title {
  margin: 12px 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(20px, 2.2vw, 26px);
  line-height: 1.14;
}

.page-about .line-item p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.62;
}

.page-about .line-note {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding-left: 15px;
  border-left: 3px solid var(--fox);
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 03 数据校验 ---------- */
.page-about .verify-grid {
  display: grid;
  gap: 28px;
  margin-top: clamp(20px, 2.8vw, 30px);
}

.page-about .verify-text {
  margin-top: 0;
}

/* ---------- 04 合作生态 ---------- */
.page-about .coop-list {
  margin: clamp(26px, 3.6vw, 40px) 0 0;
  padding: 0;
  border-bottom: 1px solid var(--grey);
}

.page-about .coop-row {
  display: grid;
  gap: 6px;
  padding: 16px 14px;
  border-top: 1px solid var(--grey);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .coop-row:hover {
  background: var(--paper);
  box-shadow: inset 3px 0 0 var(--fox);
}

.page-about .coop-term {
  margin: 0;
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--ink);
}

.page-about .coop-desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 05 内容节奏 ---------- */
.page-about .topic-grid {
  display: grid;
  gap: 26px;
  margin-top: clamp(20px, 2.8vw, 30px);
}

.page-about .topic-text {
  margin-top: 0;
}

/* ---------- 06 时间线 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: clamp(28px, 3.8vw, 46px) 0 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 34px 32px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 18px;
  bottom: 0;
  width: 1px;
  background: var(--grey);
}

.page-about .tl-item:last-child::before {
  display: none;
}

.page-about .tl-dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  background: var(--cream);
  border: 2px solid var(--fox);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl-item:hover .tl-dot,
.page-about .tl-item:focus-within .tl-dot {
  background: var(--fox);
  box-shadow: 0 0 0 4px rgba(255, 107, 26, .16);
}

.page-about .tl-item:focus-visible {
  outline: 2px solid var(--fox);
  outline-offset: 4px;
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(17px, 1.8vw, 21px);
  letter-spacing: 0;
  font-variant-numeric: tabular-nums;
  color: var(--fox-deep);
}

.page-about .tl-title {
  margin: 4px 0 8px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(19px, 2vw, 24px);
  line-height: 1.16;
}

.page-about .tl-note {
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

.page-about .tl-item:hover .tl-note,
.page-about .tl-item:focus-within .tl-note {
  color: var(--ink);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: clamp(44px, 6vw, 80px) 0;
  background: var(--ink-2);
  color: var(--cream);
  border-top: 3px solid var(--fox);
}

.page-about .next-lead {
  margin: 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.62;
  color: var(--cream);
}

.page-about .next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  margin-top: clamp(24px, 3vw, 34px);
}

.page-about .next-link {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--cream);
  text-decoration: none;
  padding-bottom: 4px;
  border-bottom: 1px solid rgba(245, 241, 232, .32);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  color: var(--fox);
  border-bottom-color: var(--fox);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .scale-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .coop-row {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .lead-grid,
  .page-about .about-grid {
    grid-template-columns: repeat(12, 1fr);
    gap: 0 24px;
  }

  .page-about .lead-rail {
    grid-column: 1 / 3;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding-top: 10px;
  }

  .page-about .lead-main {
    grid-column: 3 / 13;
  }

  .page-about .about-rail {
    grid-column: 1 / 2;
    align-self: start;
    position: sticky;
    top: 84px;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .page-about .about-body {
    grid-column: 3 / 13;
  }

  .page-about .verify-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .topic-grid {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    gap: 44px;
    align-items: center;
  }

  .page-about .topic-figure {
    order: -1;
  }
}

@media (min-width: 1180px) {
  .page-about .about-body {
    grid-column: 3 / 12;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 1ms !important;
  }
}