.page-about {
  background: var(--ink-900);
  color: var(--text);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumbs {
  padding-top: clamp(94px, 13vh, 138px);
  padding-bottom: 4px;
}
.page-about .ab-crumbs .crumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: var(--fs-13);
  color: var(--muted);
}
.page-about .ab-crumbs .crumbs-item + .crumbs-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.page-about .ab-crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}
.page-about .ab-crumbs a:hover,
.page-about .ab-crumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 通用小件 ---------- */
.page-about .ab-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: var(--fs-13);
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
}
.page-about .ab-eyebrow::before {
  content: "";
  flex: 0 0 auto;
  width: 26px;
  height: 2px;
  background: var(--cyan);
}
.page-about .ab-eyebrow .mono {
  color: var(--cyan);
  letter-spacing: .12em;
}

.page-about .ab-h2 {
  margin: 14px 0 0;
  font-size: clamp(26px, 3.6vw, 46px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: #FFFFFF;
  max-width: 22ch;
}

.page-about .ab-p {
  margin: 20px 0 0;
  font-size: var(--fs-17);
  line-height: 1.78;
  color: var(--text);
  max-width: 62ch;
}
.page-about .ab-p--tight {
  margin-top: 16px;
  font-size: 15px;
  color: var(--muted);
}
.page-about .ab-p a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 212, .4);
  transition: border-color var(--t) var(--ease);
}
.page-about .ab-p a:hover,
.page-about .ab-p a:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .ab-shot {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-800);
}
.page-about .ab-shot img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-shot figcaption {
  padding: 11px 16px;
  font-size: var(--fs-13);
  line-height: 1.6;
  color: var(--muted);
}
.page-about .ab-shot--wide {
  margin-top: clamp(34px, 5vw, 56px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 18px 0 clamp(46px, 7vw, 86px);
  overflow: hidden;
}
.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -14%;
  width: min(720px, 88vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, rgba(0, 229, 212, .17), rgba(0, 229, 212, 0) 68%);
  pointer-events: none;
}
.page-about .ab-hero-inner {
  position: relative;
  z-index: 1;
}
.page-about .ab-hero-title {
  margin: 18px 0 0;
  font-size: clamp(38px, 6.2vw, 76px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: #FFFFFF;
  max-width: 19ch;
}
.page-about .ab-hero-lede {
  margin: 24px 0 0;
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.78;
  color: var(--text);
  max-width: 60ch;
}

.page-about .ab-facts {
  list-style: none;
  margin: clamp(34px, 5vw, 54px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}
.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 18px 16px;
  background: var(--ink-800);
  transition: background var(--t) var(--ease);
}
.page-about .ab-fact:hover {
  background: var(--ink-700);
}
.page-about .ab-fact-num {
  font-size: clamp(24px, 2.4vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}
.page-about .ab-fact-label {
  font-size: var(--fs-13);
  color: var(--muted);
}

.page-about .ab-path {
  margin-top: clamp(34px, 5vw, 52px);
  padding-left: 20px;
  border-left: 2px solid var(--orange);
}
.page-about .ab-path-title {
  margin: 0;
  font-size: var(--fs-13);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--orange);
}
.page-about .ab-path-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .ab-path-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text);
}
.page-about .ab-path-list .mono {
  flex: 0 0 auto;
  color: var(--orange);
  letter-spacing: .08em;
  padding-top: 3px;
}
.page-about .ab-path-list a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 212, .4);
  transition: border-color var(--t) var(--ease);
}
.page-about .ab-path-list a:hover,
.page-about .ab-path-list a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-chapter {
  padding: clamp(56px, 8vw, 104px) 0;
}
.page-about .ab-chapter--ruled {
  padding-top: clamp(38px, 5vw, 62px);
}
.page-about .ab-chapter-head {
  max-width: 76ch;
}
.page-about .ab-chapter-note {
  margin: 18px 0 0;
  font-size: var(--fs-17);
  line-height: 1.78;
  color: var(--muted);
  max-width: 58ch;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0 0 14px;
  display: flex;
  gap: 0;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}
.page-about .ab-timeline::-webkit-scrollbar {
  height: 6px;
}
.page-about .ab-timeline::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 99px;
}
.page-about .ab-node {
  position: relative;
  flex: 0 0 262px;
  padding: 40px 22px 18px 0;
  scroll-snap-align: start;
  transition: transform var(--t) var(--ease);
}
.page-about .ab-node::before {
  content: "";
  position: absolute;
  top: 12px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--line);
}
.page-about .ab-node:first-child::before {
  background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan) 22%, var(--line) 100%);
}
.page-about .ab-node::after {
  content: "";
  position: absolute;
  top: 5px;
  left: 0;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--line);
  transition: border-color var(--t) var(--ease),
              background var(--t) var(--ease),
              box-shadow var(--t) var(--ease);
}
.page-about .ab-node:hover,
.page-about .ab-node:focus-within {
  transform: translateY(-4px);
}
.page-about .ab-node:hover::after,
.page-about .ab-node:focus-within::after {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 0 6px rgba(0, 229, 212, .14);
}
.page-about .ab-node:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: var(--r-sm);
}
.page-about .ab-node-ver {
  display: inline-block;
  font-size: var(--fs-13);
  letter-spacing: .12em;
  color: var(--cyan);
  border: 1px solid rgba(0, 229, 212, .42);
  border-radius: 999px;
  padding: 3px 11px;
}
.page-about .ab-node-title {
  margin: 14px 0 8px;
  font-size: var(--fs-17);
  font-weight: 700;
  line-height: 1.4;
  color: #FFFFFF;
}
.page-about .ab-node-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 暖纸色阅读区 ---------- */
.page-about .ab-paper {
  --text: #2A2E33;
  --muted: #6B6357;
  --line: #D8CFC0;
  --line-soft: #E4DCCE;
  background: var(--paper);
  color: var(--paper-ink);
  border-top: 1px solid var(--line);
}
.page-about .ab-paper .ab-h2 {
  color: var(--paper-ink);
}
.page-about .ab-paper .ab-eyebrow {
  color: #6B6357;
}
.page-about .ab-paper .ab-eyebrow::before,
.page-about .ab-paper .ab-eyebrow .mono {
  color: #0B8F87;
  background: none;
}
.page-about .ab-paper .ab-eyebrow::before {
  background: #0B8F87;
}
.page-about .ab-paper .ab-chapter-note,
.page-about .ab-paper .ab-p--tight {
  color: #5A5F66;
}
.page-about .ab-paper .ab-p {
  color: #2A2E33;
}
.page-about .ab-paper .ab-p a {
  color: #0B7A73;
  border-bottom-color: rgba(11, 122, 115, .4);
}
.page-about .ab-paper .ab-p a:hover,
.page-about .ab-paper .ab-p a:focus-visible {
  border-bottom-color: #0B7A73;
}
.page-about .ab-paper .ab-shot {
  border-color: var(--paper-line);
  background: #E6DED1;
}
.page-about .ab-paper .ab-shot figcaption {
  color: #6B6357;
  background: #EFE8DC;
}
.page-about .ab-chapter--ruled {
  border-top: 1px solid var(--paper-line);
}

/* ---------- 团队 ---------- */
.page-about .ab-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
}
.page-about .ab-team-body .ab-h2 {
  margin-top: 14px;
}
.page-about .ab-bars {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
  max-width: 520px;
}
.page-about .ab-bar-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
  font-size: var(--fs-13);
  font-weight: 600;
  color: var(--paper-ink);
}
.page-about .ab-bar-head .mono {
  color: #0B7A73;
  font-weight: 700;
}
.page-about .ab-bar-track {
  display: block;
  height: 10px;
  border-radius: 999px;
  background: #E0D8C9;
  overflow: hidden;
}
.page-about .ab-bar-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
}
.page-about .ab-bar-fill--a {
  background: linear-gradient(90deg, #0B8F87, #00E5D4);
}
.page-about .ab-bar-fill--b {
  background: linear-gradient(90deg, #B25200, #FF7A1A);
}

/* ---------- 内容来源 ---------- */
.page-about .ab-sources {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
  border-radius: var(--r-md);
  overflow: hidden;
}
.page-about .ab-source {
  background: #FAF6EF;
  padding: 22px 24px;
  transition: background var(--t) var(--ease);
}
.page-about .ab-source:hover {
  background: #FFFFFF;
}
.page-about .ab-source h3 {
  margin: 0 0 9px;
  font-size: var(--fs-17);
  font-weight: 700;
  color: var(--paper-ink);
}
.page-about .ab-source h3::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 10px;
  background: var(--orange);
  vertical-align: 1px;
}
.page-about .ab-source p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: #4A4F55;
}

/* ---------- 使用体验 ---------- */
.page-about .ab-tech {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.4vw, 28px);
}
.page-about .ab-tech-item {
  padding: 24px 22px 26px;
  border: 1px solid var(--paper-line);
  border-top: 3px solid #0B8F87;
  border-radius: var(--r-sm);
  background: #FAF6EF;
  transition: transform var(--t) var(--ease), border-top-color var(--t) var(--ease);
}
.page-about .ab-tech-item:hover {
  transform: translateY(-4px);
  border-top-color: var(--orange);
}
.page-about .ab-tech-num {
  display: block;
  font-size: clamp(34px, 4vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper-ink);
}
.page-about .ab-tech-num em {
  font-style: normal;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .06em;
  margin-left: 4px;
  color: #0B8F87;
}
.page-about .ab-tech-item h3 {
  margin: 16px 0 8px;
  font-size: var(--fs-17);
  font-weight: 700;
  color: var(--paper-ink);
}
.page-about .ab-tech-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: #4A4F55;
}

/* ---------- 服务范围 ---------- */
.page-about .ab-region {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(26px, 4vw, 40px);
  align-items: start;
}
.page-about .ab-compliance {
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--paper-line);
}
.page-about .ab-compliance-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  justify-content: space-between;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid var(--paper-line);
}
.page-about .ab-compliance-row dt {
  font-size: var(--fs-13);
  letter-spacing: .08em;
  color: #7A7365;
}
.page-about .ab-compliance-row dd {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper-ink);
  word-break: break-all;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-sources {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-tech {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  .page-about .ab-fact {
    padding: 20px 18px;
  }
  .page-about .ab-team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(34px, 4vw, 60px);
  }
  .page-about .ab-shot--team {
    position: sticky;
    top: calc(var(--rail-h) + var(--header-h) + 24px);
  }
  .page-about .ab-tech {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-region {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (max-width: 820px) {
  .page-about .ab-timeline {
    display: block;
    overflow: visible;
    padding-left: 2px;
  }
  .page-about .ab-node {
    flex: none;
    padding: 0 0 26px 28px;
  }
  .page-about .ab-node::before {
    top: 6px;
    bottom: 0;
    left: 7px;
    right: auto;
    width: 2px;
    height: auto;
    background: var(--line);
  }
  .page-about .ab-node:first-child::before {
    background: linear-gradient(180deg, var(--cyan) 0%, var(--cyan) 12%, var(--line) 100%);
  }
  .page-about .ab-node:last-child::before {
    display: none;
  }
  .page-about .ab-node::after {
    top: 2px;
    left: 0;
  }
  .page-about .ab-node:hover,
  .page-about .ab-node:focus-within {
    transform: none;
  }
  .page-about .ab-node:last-child {
    padding-bottom: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node,
  .page-about .ab-node::after,
  .page-about .ab-fact,
  .page-about .ab-tech-item,
  .page-about .ab-source,
  .page-about .ab-crumbs a,
  .page-about .ab-p a {
    transition: none;
  }
  .page-about .ab-node:hover,
  .page-about .ab-node:focus-within,
  .page-about .ab-tech-item:hover {
    transform: none;
  }
}