.page-about {
  --ab-section-pad: clamp(44px, 6vw, 80px);
  --ab-radius: var(--radius-md);
  display: block;
  background: var(--ink);
  color: var(--chalk);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  padding-bottom: clamp(48px, 7vw, 96px);
}

/* ---------- 章节索引栏 ---------- */
.page-about .about-toc {
  padding-block: 14px;
  border-block: 1px solid var(--moss);
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-toc-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-about .about-toc-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-toc-list a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  border: 1px solid var(--moss);
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.2;
  white-space: nowrap;
  color: var(--chalk);
  text-decoration: none;
  transition: background 0.22s ease, border-color 0.22s ease, color 0.22s ease;
}

.page-about .about-toc-list a:hover,
.page-about .about-toc-list a:focus-visible {
  background: var(--slate);
  border-color: var(--lime);
  color: var(--lime);
}

.page-about .toc-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--teal);
}

.page-about .about-toc-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
}

.page-about .toc-note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--sage);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: clamp(8px, 2vw, 16px);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  max-width: 16em;
  font-family: var(--font-display);
  font-size: clamp(32px, 5.6vw, 64px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-about .hero-lede {
  max-width: 62ch;
  margin: 0;
  font-size: clamp(15px, 1.05vw, 18px);
  line-height: 1.85;
  color: var(--chalk);
  opacity: 0.82;
}

.page-about .about-hero-fig,
.page-about .about-fig {
  margin: clamp(24px, 3.5vw, 40px) 0 0;
}

.page-about .about-hero-fig .media-cap,
.page-about .about-fig .media-cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--sage);
}

/* ---------- 规模数字 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--moss);
  border: 1px solid var(--moss);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-stat {
  position: relative;
  padding: 20px 20px 22px;
  background: var(--ink-green);
  border-left: 2px solid transparent;
  outline: none;
  transition: background 0.25s ease, border-color 0.25s ease;
}

.page-about .about-stat:hover,
.page-about .about-stat:focus {
  background: var(--slate);
  border-left-color: var(--lime);
}

.page-about .about-stat:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -3px;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--chalk);
  transition: color 0.25s ease;
}

.page-about .about-stat:hover .stat-num,
.page-about .about-stat:focus .stat-num {
  color: var(--lime);
}

.page-about .stat-suffix {
  font-size: 0.46em;
  margin-left: 4px;
  letter-spacing: 0.02em;
}

.page-about .stat-label {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--sage);
}

.page-about .stat-note {
  display: block;
  max-height: 0;
  margin-top: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--sage);
  transition: max-height 0.3s ease, opacity 0.25s ease, margin-top 0.3s ease;
}

.page-about .about-stat:hover .stat-note,
.page-about .about-stat:focus .stat-note {
  max-height: 120px;
  margin-top: 8px;
  opacity: 1;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-block: var(--ab-section-pad);
  border-top: 1px solid var(--moss);
  scroll-margin-top: 120px;
}

.page-about .about-section h2 {
  margin: 0 0 18px;
  max-width: 22em;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.page-about .about-section > p {
  max-width: 68ch;
  margin: 0 0 16px;
  font-size: clamp(15px, 1.02vw, 17px);
  line-height: 1.85;
  color: var(--chalk);
  opacity: 0.84;
}

.page-about .about-section > p.section-lede {
  font-size: clamp(16px, 1.18vw, 19px);
  line-height: 1.8;
  opacity: 0.94;
}

/* ---------- 索引体系 ---------- */
.page-about .index-rows {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--moss);
}

.page-about .index-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--moss);
  transition: background 0.25s ease;
}

.page-about .row-key {
  position: relative;
  padding-left: 15px;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--chalk);
}

.page-about .row-key::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.52em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--teal);
  transition: background 0.25s ease, transform 0.25s ease;
}

.page-about .index-row:hover .row-key::before {
  background: var(--lime);
  transform: scale(1.35);
}

.page-about .index-row .row-desc {
  margin: 0;
  max-width: none;
  font-size: 15px;
  line-height: 1.8;
  color: var(--chalk);
  opacity: 0.8;
}

/* ---------- 适配规格 ---------- */
.page-about .spec-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .spec-grid > li {
  padding: 16px 14px 18px;
  background: var(--ink-green);
  border: 1px solid var(--moss);
  border-radius: var(--ab-radius);
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about .spec-grid > li:hover {
  border-color: var(--lime);
  background: var(--slate);
}

.page-about .spec-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-about .spec-label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-body);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--chalk);
}

.page-about .spec-text {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--sage);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team-grid > li {
  padding: 18px 18px 20px;
  background: var(--ink-green);
  border: 1px solid var(--moss);
  border-radius: var(--ab-radius);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about .team-grid > li:hover {
  border-color: var(--teal);
}

.page-about .team-grid h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--chalk);
}

.page-about .team-grid h3::before {
  content: "";
  width: 14px;
  height: 2px;
  flex: none;
  background: var(--lime);
}

.page-about .team-grid p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--sage);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime), var(--teal) 55%, var(--moss));
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 22px;
  outline: none;
}

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

.page-about .tl-dot {
  position: absolute;
  left: -27px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--teal);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .tl-item:hover .tl-dot,
.page-about .tl-item:focus .tl-dot {
  border-color: var(--lime);
  box-shadow: 0 0 0 5px rgba(198, 255, 61, 0.14);
}

.page-about .tl-item:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 6px;
  border-radius: var(--radius-md);
}

.page-about .tl-year {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--teal);
}

.page-about .tl-body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.01em;
  color: var(--chalk);
}

.page-about .tl-body p {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--chalk);
  opacity: 0.8;
}

.page-about .tl-body .tl-more {
  max-height: 0;
  margin-top: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  color: var(--sage);
  transition: max-height 0.3s ease, opacity 0.3s ease, margin-top 0.3s ease;
}

.page-about .tl-item:hover .tl-more,
.page-about .tl-item:focus .tl-more {
  max-height: 100px;
  margin-top: 6px;
  opacity: 1;
}

/* ---------- 合作生态 ---------- */
.page-about .eco-map {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: clamp(22px, 3vw, 32px) 0;
  padding: 18px;
  border: 1px solid var(--moss);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, var(--ink-green), var(--ink) 72%);
}

.page-about .eco-core {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 18px;
  border: 1px solid var(--moss);
  border-radius: var(--ab-radius);
  background: var(--slate);
}

.page-about .eco-core-name {
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.01em;
  color: var(--lime);
}

.page-about .eco-core-sub {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--sage);
}

.page-about .eco-spokes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .eco-spoke {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 11px 14px;
  border: 1px solid var(--moss);
  border-radius: var(--radius-pill);
  background: var(--ink);
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about .eco-spoke:hover {
  border-color: var(--teal);
  background: var(--slate);
}

.page-about .eco-k {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--teal);
}

.page-about .eco-v {
  font-size: 13px;
  line-height: 1.4;
  color: var(--chalk);
}

.page-about .service-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--moss);
  border: 1px solid var(--moss);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .service-strip > li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: 14px 18px;
  background: var(--ink-green);
}

.page-about .sv-key {
  flex: none;
  min-width: 82px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-about .sv-val {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--chalk);
}

/* ---------- 行动入口 ---------- */
.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(22px, 3vw, 30px);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .index-row {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 0 28px;
    align-items: start;
    padding: 20px 10px;
    border-radius: var(--ab-radius);
  }

  .page-about .index-row:hover {
    background: var(--ink-green);
  }

  .page-about .eco-map {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
    align-items: center;
    padding: 22px;
  }

  .page-about .service-strip > li {
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 216px minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 104px;
    margin-bottom: 0;
    padding: 4px 22px 4px 0;
    border-block: none;
    border-right: 1px solid var(--moss);
  }

  .page-about .about-toc-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .about-toc-list a {
    justify-content: flex-start;
    white-space: normal;
    padding: 9px 12px;
    border: 0;
    border-radius: var(--ab-radius);
    font-size: 14px;
    color: var(--sage);
  }

  .page-about .about-toc-list a:hover,
  .page-about .about-toc-list a:focus-visible {
    background: var(--slate);
    color: var(--chalk);
  }

  .page-about .about-toc-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    margin-top: 20px;
  }

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

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

  .page-about .tl-dot {
    left: -34px;
    top: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}
<<<END>>>