.page-about {
  --about-rail: 104px;
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 32px) 0 clamp(48px, 8vw, 96px);
  background:
    radial-gradient(110% 80% at 92% -8%, var(--cyan-a08), transparent 62%),
    radial-gradient(80% 60% at 0% 0%, var(--orange-a12), transparent 58%),
    var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.35;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.95), transparent 82%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.95), transparent 82%);
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
}

.page-about .breadcrumbs {
  margin-bottom: 28px;
}

.page-about .breadcrumbs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .breadcrumbs-item + .breadcrumbs-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumbs-item a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

.page-about .about-hero-main h1 {
  margin: 16px 0 0;
  color: var(--paper);
}

.page-about .about-hero-main .lede {
  margin-top: 22px;
  max-width: 34em;
  color: var(--mist);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.page-about .about-hero-board {
  border: 1px solid var(--line);
  background: var(--forest);
  padding: 24px 20px;
  align-self: start;
}

.page-about .board-label {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .board-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .board-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .board-k {
  font-size: 14px;
  color: var(--mist);
}

.page-about .board-v {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 20px;
  color: var(--paper);
}

.page-about .board-foot {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 18px 0 0;
  font-size: 13px;
  color: var(--mist);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: clamp(56px, 9vw, 112px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section--tight {
  padding: clamp(48px, 7vw, 88px) 0;
}

.page-about .about-grid {
  display: grid;
  gap: 24px;
}

.page-about .about-head h2,
.page-about .about-section > .shell > h2,
.page-about .about-timeline .shell > h2,
.page-about .about-band .shell > h2 {
  margin: 14px 0 0;
  color: var(--paper);
}

.page-about .about-copy {
  max-width: 40em;
  color: var(--mist);
}

.page-about .about-copy p {
  margin: 0 0 16px;
}

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

.page-about .about-copy a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-a40);
}

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

/* ---------- 数字块 ---------- */
.page-about .metric-row {
  display: grid;
  gap: 1px;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .metric {
  margin: 0;
  padding: 24px 20px 26px;
  background: var(--char);
}

.page-about .metric-label {
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .metric-value {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 12px 0 10px;
}

.page-about .metric-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(38px, 7vw, 52px);
  line-height: 1;
  color: var(--orange);
}

.page-about .metric-unit {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--mist);
}

.page-about .metric-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-inline-link {
  margin: 28px 0 0;
  font-size: 15px;
  color: var(--mist);
}

.page-about .about-inline-link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-a40);
}

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

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding: clamp(56px, 9vw, 112px) 0;
  background: var(--forest);
  border-bottom: 1px solid var(--line);
}

.page-about .timeline {
  display: grid;
  gap: 24px;
  margin-top: clamp(28px, 5vw, 48px);
}

.page-about .timeline-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
}

.page-about .rail-list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .rail-year {
  display: inline-block;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid var(--line);
  white-space: nowrap;
}

.page-about .rail-year:hover,
.page-about .rail-year:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

.page-about .timeline-track {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line);
}

.page-about .tl-item {
  position: relative;
  display: grid;
  gap: 8px;
  padding: 0 0 32px 22px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1px solid var(--cyan);
}

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

.page-about .tl-year {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 22px;
  color: var(--orange);
  letter-spacing: 0.04em;
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(20px, 3.4vw, 26px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--paper);
}

.page-about .tl-text {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .tl-media {
  margin: clamp(32px, 5vw, 48px) 0 0;
}

/* ---------- 图片 ---------- */
.page-about .media-frame {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--char);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media-frame figcaption {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

/* ---------- 流程 ---------- */
.page-about .flow-figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
  border: 1px solid var(--line);
}

.page-about .flow-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .flow-scroll {
  margin-top: 24px;
  overflow-x: auto;
  border: 1px solid var(--line);
  background: var(--char);
  padding: 12px;
}

.page-about .flow-svg {
  display: block;
  width: 100%;
  min-width: 720px;
  height: auto;
}

.page-about .flow-svg .flow-node rect {
  transition: stroke 160ms ease-out, fill 160ms ease-out;
}

.page-about .flow-svg .flow-node:hover rect,
.page-about .flow-svg .flow-node:focus-within rect {
  stroke: var(--cyan);
  fill: var(--pitch);
}

.page-about .flow-svg .flow-num {
  font-family: var(--font-mono);
  font-size: 13px;
  fill: var(--cyan);
  letter-spacing: 0.12em;
}

.page-about .flow-svg .flow-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  fill: var(--paper);
}

.page-about .flow-svg .flow-note {
  font-family: var(--font-body);
  font-size: 13px;
  fill: var(--mist);
  opacity: 0;
  transition: opacity 160ms ease-out;
}

.page-about .flow-svg .flow-node:hover .flow-note {
  opacity: 1;
}

.page-about .flow-caption {
  margin: 14px 0 0;
  font-size: 13px;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  gap: 28px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .team-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: var(--char);
}

.page-about .team-table {
  width: 100%;
  min-width: 600px;
  border-collapse: collapse;
  text-align: left;
  font-size: 15px;
}

.page-about .team-caption {
  padding: 16px 18px;
  text-align: left;
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
  border-bottom: 1px solid var(--cyan-a40);
}

.page-about .team-table th,
.page-about .team-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .team-table thead th {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--paper);
  font-weight: 600;
  border-bottom: 1px solid var(--cyan-a40);
}

.page-about .team-table tbody th {
  color: var(--paper);
  font-weight: 600;
  white-space: nowrap;
}

.page-about .team-table .num {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--paper);
}

.page-about .team-table tbody tr {
  transition: background 160ms ease-out;
}

.page-about .team-table tbody tr:hover {
  background: var(--pitch);
}

.page-about .team-link {
  display: inline-block;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-a40);
}

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

.page-about .team-media {
  margin: 0;
}

/* ---------- 数据带 ---------- */
.page-about .about-band {
  padding: clamp(56px, 9vw, 104px) 0;
  background: var(--char);
  border-bottom: 1px solid var(--line);
}

.page-about .data-band {
  display: grid;
  gap: 1px;
  margin-top: clamp(28px, 5vw, 44px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .data-cell {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 26px 20px;
  background: var(--ink);
}

.page-about .data-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(32px, 6vw, 46px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .data-lab {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .data-note {
  max-width: 44em;
  margin: 26px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 合作 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 1px;
  list-style: none;
  margin: clamp(28px, 5vw, 44px) 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .partner-item {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 22px 20px;
  background: var(--forest);
}

.page-about .partner-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 34px;
  line-height: 1;
  color: var(--orange);
  flex: none;
}

.page-about .partner-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-cta {
  margin-top: clamp(32px, 5vw, 52px);
  padding: 28px 22px;
  border: 1px solid var(--cyan-a40);
  background: var(--cyan-a08);
}

.page-about .about-cta-text {
  margin: 0 0 20px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--paper);
}

.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .metric-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .partner-item {
    padding: 26px 24px;
  }

  .page-about .about-cta {
    padding: 36px 32px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.85fr);
    align-items: start;
    gap: 56px;
  }

  .page-about .about-hero-board {
    margin-top: 34px;
  }

  .page-about .about-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .timeline {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .timeline-rail {
    position: sticky;
    top: calc(var(--header-h-compact) + 28px);
    display: block;
    overflow: visible;
    padding-bottom: 0;
    border-bottom: 0;
    border-right: 1px solid var(--line);
  }

  .page-about .rail-list {
    flex-direction: column;
    gap: 4px;
  }

  .page-about .rail-year {
    display: block;
    border: 0;
    border-right: 2px solid transparent;
    padding: 8px 12px;
    font-size: 15px;
    text-align: right;
  }

  .page-about .rail-year:hover,
  .page-about .rail-year:focus-visible {
    background: var(--cyan-a08);
    color: var(--cyan);
    border-right-color: var(--cyan);
  }

  .page-about .tl-item {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 24px;
    padding-left: 28px;
  }

  .page-about .tl-year {
    font-size: 26px;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    gap: 32px;
    align-items: start;
  }

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

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

@media (min-width: 1100px) {
  .page-about {
    --about-rail: 128px;
  }

  .page-about .about-hero-board {
    margin-top: 52px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow-svg .flow-note,
  .page-about .flow-svg .flow-node rect,
  .page-about .team-table tbody tr {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>