.page-about {
  --about-rail: 200px;
  display: block;
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 32px 0 40px;
  background:
    repeating-linear-gradient(0deg, rgba(27, 58, 82, 0.28) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(90deg, rgba(27, 58, 82, 0.28) 0 1px, transparent 1px 64px),
    linear-gradient(160deg, var(--ink-2) 0%, var(--ink) 62%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -18%;
  right: -12%;
  width: min(620px, 88vw);
  height: 132%;
  background: linear-gradient(150deg, rgba(47, 224, 232, 0.2), rgba(18, 60, 99, 0.28) 46%, rgba(5, 15, 27, 0) 74%);
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 78%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
}

.page-about .about-hero__copy h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 7vw, 54px);
  line-height: 1.06;
  letter-spacing: -0.015em;
  max-width: 18ch;
}

.page-about .about-hero__lede {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-hero__panel {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, rgba(11, 33, 54, 0.94), rgba(5, 15, 27, 0.9));
  padding: 20px;
  box-shadow: var(--shadow);
}

.page-about .about-hero__panel-label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-hero__pulse {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 12px 0 4px;
  font-size: 30px;
  color: var(--lime);
}

.page-about .about-hero__panel-note {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 18px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line-soft);
  display: grid;
  gap: 10px;
  font-size: 14px;
}

.page-about .about-hero__facts .mono {
  display: inline-block;
  min-width: 42px;
  color: var(--cyan);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  gap: 32px;
  padding: 40px 0 8px;
}

.page-about .about-rail {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .rail-list {
  list-style: none;
  display: flex;
  gap: 10px;
  margin: 10px 0 0;
  padding: 0 0 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .rail-list a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
  padding: 7px 12px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-pill);
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  transition: color 150ms var(--ease), border-color 150ms var(--ease), background 150ms var(--ease);
}

.page-about .rail-list a .mono {
  color: var(--cyan);
  font-size: 12px;
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  color: var(--text);
  border-color: var(--cyan);
  background: var(--cyan-soft);
}

.page-about .about-body {
  display: grid;
  gap: 56px;
  min-width: 0;
}

.page-about .about-section {
  scroll-margin-top: 96px;
  min-width: 0;
}

.page-about .about-note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 224, 232, 0.4);
}

.page-about .about-note a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- 指标区 ---------- */
.page-about .metrics {
  display: grid;
  gap: 16px;
}

.page-about .metric {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(165deg, var(--panel), var(--ink-2));
  padding: 22px 20px;
  overflow: hidden;
  transition: transform 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .metric::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan), rgba(47, 224, 232, 0));
}

.page-about .metric--tall {
  padding-top: 34px;
  padding-bottom: 30px;
}

.page-about .metric--mid {
  border-color: rgba(166, 245, 60, 0.36);
}

.page-about .metric--mid::before {
  background: linear-gradient(180deg, var(--lime), rgba(166, 245, 60, 0));
}

.page-about .metric:hover,
.page-about .metric:focus-visible,
.page-about .metric:focus-within {
  transform: translateY(-4px);
  border-color: var(--cyan);
  outline: none;
}

.page-about .metric__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .metric__value {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(42px, 12vw, 62px);
  line-height: 1;
  color: var(--text);
}

.page-about .metric--mid .metric__value {
  color: var(--lime);
}

.page-about .metric__unit {
  margin: 6px 0 0;
  font-size: 14px;
  color: var(--cyan);
}

.page-about .metric__meta {
  margin: 12px 0 0;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .metric__note {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line-soft);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  transition: max-height 200ms var(--ease), opacity 200ms var(--ease), margin-top 200ms var(--ease);
}

/* ---------- 内容体系 ---------- */
.page-about .system-grid {
  display: grid;
  gap: 24px;
  align-items: center;
}

.page-about .system-copy {
  display: grid;
  gap: 12px;
}

.page-about .system-card {
  border-left: 2px solid var(--line);
  padding: 2px 0 2px 16px;
}

.page-about .system-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: -0.01em;
}

.page-about .system-card p {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .system-copy .system-card:nth-child(2) {
  border-left-color: var(--cyan);
}

.page-about .system-copy .system-card:nth-child(3) {
  border-left-color: var(--lime);
}

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

.page-about .system-svg {
  display: block;
  width: 100%;
  max-width: 320px;
  margin: 0 auto;
  height: auto;
}

.page-about .system-figure__cap {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  text-align: center;
}

.page-about .system-media {
  margin: 26px 0 0;
}

/* ---------- 时间线 ---------- */
.page-about .timeline-intro {
  display: grid;
  gap: 16px;
  margin-bottom: 26px;
}

.page-about .timeline-intro__img {
  width: 100%;
  height: auto;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-about .timeline-intro__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  position: relative;
  display: grid;
  gap: 6px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 5px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--line) 68%, rgba(27, 58, 82, 0));
}

.page-about .tl-item {
  position: relative;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -21px;
  top: 20px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(166, 245, 60, 0.14);
}

.page-about .tl-item details {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .tl-item summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  align-items: baseline;
  padding: 14px 0;
}

.page-about .tl-item summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  color: var(--cyan);
}

.page-about .tl-title {
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .tl-toggle {
  color: var(--muted);
  font-size: 16px;
  line-height: 1;
}

.page-about .tl-item details[open] .tl-toggle {
  color: var(--lime);
}

.page-about .tl-body {
  padding: 0 0 16px;
  display: grid;
  gap: 8px;
}

.page-about .tl-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 62ch;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 24px;
}

.page-about .team-copy p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 62ch;
}

.page-about .team-points {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  border-top: 1px solid var(--line-soft);
  padding-top: 16px;
}

.page-about .team-points li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .team-points .mono {
  min-width: 34px;
  font-size: 18px;
  color: var(--cyan);
}

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

/* ---------- 会员矩阵 ---------- */
.page-about .member-lede {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 62ch;
}

.page-about .table-scroll {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-2);
  -webkit-overflow-scrolling: touch;
}

.page-about .member-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .member-table caption {
  caption-side: top;
  text-align: left;
  padding: 14px 16px 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .member-table th,
.page-about .member-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line-soft);
  text-align: left;
  color: var(--muted);
  line-height: 1.6;
}

.page-about .member-table thead th {
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: 0.04em;
  color: var(--text);
  background: rgba(11, 33, 54, 0.9);
  border-bottom: 1px solid var(--line);
}

.page-about .member-table tbody th {
  color: var(--text);
  font-weight: 500;
  white-space: nowrap;
}

.page-about .member-table .is-v3 {
  background: var(--cyan-soft);
  color: var(--text);
  box-shadow: inset 1px 0 0 rgba(47, 224, 232, 0.34), inset -1px 0 0 rgba(47, 224, 232, 0.34);
}

.page-about .member-table thead .is-v3 {
  color: var(--cyan);
  box-shadow: inset 1px 0 0 rgba(47, 224, 232, 0.34), inset -1px 0 0 rgba(47, 224, 232, 0.34), inset 0 2px 0 var(--cyan);
}

.page-about .member-table tbody tr:last-child th,
.page-about .member-table tbody tr:last-child td {
  border-bottom: 0;
}

/* ---------- 合作 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 14px;
}

.page-about .partner-card {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(11, 33, 54, 0.7), rgba(5, 15, 27, 0.7));
  padding: 18px;
  transition: border-color 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .partner-card:hover {
  border-color: var(--cyan);
  transform: translateY(-4px);
}

.page-about .partner-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: -0.01em;
}

.page-about .partner-card p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-cta {
  margin-top: 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    linear-gradient(120deg, rgba(255, 122, 60, 0.12), rgba(5, 15, 27, 0) 58%),
    var(--panel);
  padding: 22px 20px;
  display: grid;
  gap: 14px;
}

.page-about .about-cta p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
  max-width: 62ch;
}

/* ---------- 断点 ---------- */
@media (hover: hover) and (min-width: 900px) {
  .page-about .metric__note {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
  }

  .page-about .metric:hover .metric__note,
  .page-about .metric:focus-within .metric__note,
  .page-about .metric:focus-visible .metric__note {
    max-height: 9em;
    opacity: 1;
    margin-top: 10px;
  }
}

@media (min-width: 620px) {
  .page-about .about-hero {
    padding: 48px 0 52px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(240px, 300px);
    align-items: end;
    gap: 36px;
  }

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

  .page-about .metric--tall {
    margin-top: 0;
  }

  .page-about .metric--mid {
    margin-top: 28px;
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .about-shell {
    padding-top: 56px;
  }

  .page-about .about-body {
    gap: 72px;
  }

  .page-about .system-grid {
    grid-template-columns: minmax(0, 1fr) minmax(240px, 340px);
    gap: 40px;
  }

  .page-about .timeline-intro {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 32px;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    gap: 36px;
  }

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

@media (min-width: 1080px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 4px 0 4px 16px;
  }

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

  .page-about .rail-list a {
    border: 0;
    border-radius: var(--r-sm);
    padding: 8px 10px;
    width: 100%;
  }

  .page-about .rail-list a:hover,
  .page-about .rail-list a:focus-visible {
    background: var(--cyan-soft);
    border-left: 2px solid var(--cyan);
    padding-left: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .metric,
  .page-about .partner-card,
  .page-about .metric__note,
  .page-about .rail-list a {
    transition: none;
  }

  .page-about .metric:hover,
  .page-about .metric:focus-visible,
  .page-about .partner-card:hover {
    transform: none;
  }
}
<<<END>>>