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

.page-about h2 {
  font-size: clamp(1.45rem, 3.6vw, 2.1rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 0.5rem 0 0.9rem;
  color: var(--chalk);
}

.page-about h3 {
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.45;
  margin: 0 0 0.5rem;
  color: var(--chalk);
}

/* ---------- 面包屑与首屏 ---------- */

.page-about .about-crumb {
  padding-top: 1.4rem;
}

.page-about .about-hero {
  padding-block: 1.1rem 2.6rem;
}

.page-about .about-title {
  font-size: clamp(2rem, 7.2vw, 3.7rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0.5rem 0 1rem;
  max-width: 20ch;
  color: var(--chalk);
}

.page-about .about-lede {
  font-size: clamp(0.98rem, 2vw, 1.1rem);
  line-height: 1.85;
  color: var(--steel);
  max-width: 62ch;
  margin: 0;
}

.page-about .about-facts {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.7rem;
}

.page-about .about-facts li {
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--steel);
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: var(--panel-soft);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

/* ---------- 左右分屏长读 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.5rem;
  padding-bottom: 1rem;
}

.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 0;
}

.page-about .rail-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1.2rem 1.3rem;
}

.page-about .rail-card--status {
  background: linear-gradient(145deg, rgba(255, 199, 44, 0.15), rgba(0, 229, 255, 0.07));
  border-color: rgba(255, 199, 44, 0.35);
}

.page-about .rail-status {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin: 0.55rem 0 0;
  font-size: 0.86rem;
  color: var(--chalk);
  line-height: 1.5;
}

.page-about .rail-note {
  margin: 0.6rem 0 0;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .rail-stats {
  list-style: none;
  margin: 0.9rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem 0.75rem;
}

.page-about .rail-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.15;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .rail-cap {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.76rem;
  color: var(--steel);
}

.page-about .rail-links {
  list-style: none;
  margin: 0.9rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.page-about .rail-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel-soft);
  color: var(--chalk);
  font-size: 0.86rem;
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .rail-links a::after {
  content: "→";
  color: var(--steel);
  transition: color 0.2s ease;
}

.page-about .rail-links a:hover,
.page-about .rail-links a:focus-visible {
  border-color: var(--gold);
  color: var(--gold);
}

.page-about .rail-links a:hover::after,
.page-about .rail-links a:focus-visible::after {
  color: var(--gold);
}

/* ---------- 右侧长文流 ---------- */

.page-about .about-flow {
  display: grid;
  gap: 3rem;
  min-width: 0;
}

.page-about .flow-section > p,
.page-about .network-copy > p,
.page-about .collab-card > p {
  color: var(--steel);
  line-height: 1.85;
  margin: 0 0 0.9rem;
}

.page-about .flow-section > p:last-child {
  margin-bottom: 0;
}

/* 服务线 */

.page-about .service-lines {
  display: grid;
  gap: 1rem;
  margin-top: 1.6rem;
}

.page-about .service-line {
  position: relative;
  padding: 1.2rem 1.2rem 1.25rem 1.5rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .service-line::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  border-radius: var(--radius) 0 0 var(--radius);
  background: var(--gold);
}

.page-about .service-line:nth-child(2)::before {
  background: var(--cyan);
}

.page-about .service-line:nth-child(3)::before {
  background: var(--gold);
  opacity: 0.55;
}

.page-about .service-line:hover {
  border-color: rgba(255, 199, 44, 0.55);
}

.page-about .service-line__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin-bottom: 0.45rem;
}

.page-about .service-line:nth-child(1) .service-line__idx,
.page-about .service-line:nth-child(3) .service-line__idx {
  color: var(--gold);
}

.page-about .service-line > p {
  margin: 0;
  color: var(--steel);
  line-height: 1.8;
  font-size: 0.94rem;
}

.page-about .flow-more {
  margin: 1.5rem 0 0;
}

/* 团队构成图 */

.page-about .team-chart {
  margin-top: 1.8rem;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-soft);
}

.page-about .team-bar {
  display: flex;
  height: 20px;
  margin-top: 0.85rem;
  border-radius: var(--pill);
  overflow: hidden;
  background: var(--line);
}

.page-about .team-seg {
  display: block;
  height: 100%;
}

.page-about .team-seg--a {
  width: 39.5%;
  background: var(--gold);
}

.page-about .team-seg--b {
  width: 20.9%;
  background: var(--cyan);
}

.page-about .team-seg--c {
  width: 39.6%;
  background: var(--steel);
}

.page-about .team-legend {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .team-legend li {
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--steel);
}

.page-about .team-legend b {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--chalk);
  font-variant-numeric: tabular-nums;
}

.page-about .legend-swatch {
  display: block;
  width: 22px;
  height: 4px;
  border-radius: var(--pill);
  margin-bottom: 0.45rem;
}

.page-about .legend-swatch--a {
  background: var(--gold);
}

.page-about .legend-swatch--b {
  background: var(--cyan);
}

.page-about .legend-swatch--c {
  background: var(--steel);
}

/* 图片 */

.page-about .flow-figure {
  margin: 1.8rem 0 0;
}

.page-about .flow-figure figcaption {
  margin-top: 0.7rem;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .media {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.page-about .about-timeline-media {
  margin-top: 1.4rem;
}

/* 时间线 */

.page-about .timeline {
  list-style: none;
  margin: 1.9rem 0 0;
  padding: 0 0 0 1.7rem;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), rgba(255, 199, 44, 0.1));
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 1.6rem;
  outline-offset: 6px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -1.7rem;
  top: 0.4rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--gold);
  box-shadow: 0 0 0 4px rgba(255, 199, 44, 0.12);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
  margin-bottom: 0.3rem;
}

.page-about .tl-item > p {
  margin: 0;
  color: var(--steel);
  font-size: 0.92rem;
  line-height: 1.8;
}

.page-about .tl-detail {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin-top: 0;
  font-size: 0.88rem;
  color: var(--steel);
  border-left: 2px solid var(--line);
  padding-left: 0.85rem;
  transition: max-height 0.35s ease, opacity 0.3s ease, margin-top 0.3s ease;
}

.page-about .tl-item:hover .tl-detail,
.page-about .tl-item:focus-within .tl-detail,
.page-about .tl-item:focus .tl-detail {
  max-height: 12rem;
  opacity: 1;
  margin-top: 0.6rem;
}

/* ---------- 服务网络 ---------- */

.page-about .about-network {
  position: relative;
  margin-top: 3rem;
  padding-block: 3.25rem 3.5rem;
  background: linear-gradient(180deg, rgba(20, 26, 40, 0.9) 0%, rgba(10, 14, 23, 1) 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-network::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(620px 260px at 86% 6%, rgba(0, 229, 255, 0.1), transparent 70%);
  pointer-events: none;
}

.page-about .network-inner {
  position: relative;
  z-index: 1;
}

.page-about .network-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.8rem;
  align-items: center;
}

.page-about .network-media {
  max-width: 420px;
}

.page-about .network-link {
  margin: 1.1rem 0 0;
}

.page-about .partner-grid {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
}

.page-about .partner-grid li {
  display: flex;
  align-items: flex-end;
  min-height: 74px;
  padding: 0.85rem 0.8rem;
  border: 1px solid var(--line);
  border-top-width: 2px;
  border-radius: var(--radius-sm);
  background: var(--panel);
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--steel);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .partner-grid li:nth-child(4n + 1) {
  border-top-color: var(--gold);
}

.page-about .partner-grid li:nth-child(4n + 2) {
  border-top-color: var(--cyan);
}

.page-about .partner-grid li:nth-child(4n + 3) {
  border-top-color: var(--steel);
}

.page-about .partner-grid li:nth-child(4n + 4) {
  border-top-color: var(--mint);
}

.page-about .partner-grid li:hover {
  border-color: rgba(255, 199, 44, 0.55);
  color: var(--chalk);
}

/* ---------- 合作方向 ---------- */

.page-about .about-collab {
  padding-block: 3.25rem 3.5rem;
}

.page-about .collab-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin-top: 1.7rem;
}

.page-about .collab-card {
  position: relative;
  padding: 1.3rem 1.25rem 1.35rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.page-about .collab-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gold);
}

.page-about .collab-card--cyan::after {
  background: var(--cyan);
}

.page-about .collab-card--mint::after {
  background: var(--mint);
}

.page-about .collab-card:hover {
  border-color: rgba(255, 199, 44, 0.55);
}

.page-about .collab-card > p:last-child {
  margin-bottom: 0;
}

.page-about .collab-link {
  margin: 1rem 0 0 !important;
}

.page-about .collab-contact {
  margin-top: 1.8rem;
  padding: 1.15rem 1.25rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  border-radius: var(--radius-sm);
  background: var(--panel-soft);
}

.page-about .collab-contact p {
  margin: 0;
  color: var(--steel);
  font-size: 0.9rem;
  line-height: 1.85;
}

.page-about .collab-contact strong {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--chalk);
  font-variant-numeric: tabular-nums;
}

/* ---------- 通用链接态 ---------- */

.page-about .flow-more a,
.page-about .network-link a,
.page-about .collab-link a,
.page-about .collab-contact a {
  display: inline-block;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.35);
  padding-bottom: 1px;
  font-size: 0.92rem;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .flow-more a:hover,
.page-about .network-link a:hover,
.page-about .collab-link a:hover,
.page-about .collab-contact a:hover,
.page-about .flow-more a:focus-visible,
.page-about .network-link a:focus-visible,
.page-about .collab-link a:focus-visible,
.page-about .collab-contact a:focus-visible {
  color: var(--gold);
  border-color: var(--gold);
}

/* ---------- 小屏适配 ---------- */

@media (max-width: 639px) {
  .page-about .about-title {
    max-width: none;
  }

  .page-about .rail-stats {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .team-legend b {
    display: inline;
    margin-right: 0.35rem;
  }

  .page-about .legend-swatch {
    display: inline-block;
    vertical-align: middle;
    margin: 0 0.4rem 0 0;
  }

  .page-about .tl-detail {
    max-height: none;
    opacity: 1;
    margin-top: 0.6rem;
  }
}

@media (min-width: 640px) {
  .page-about .team-legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 720px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .collab-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .network-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 2.5rem;
  }

  .page-about .network-media {
    max-width: none;
    justify-self: end;
  }
}

@media (min-width: 1040px) {
  .page-about .about-layout {
    grid-template-columns: 300px minmax(0, 1fr);
    gap: 3.5rem;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 7rem;
  }

  .page-about .tl-detail {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
  }

  .page-about .tl-item:hover .tl-detail,
  .page-about .tl-item:focus-within .tl-detail,
  .page-about .tl-item:focus .tl-detail {
    max-height: 12rem;
    opacity: 1;
    margin-top: 0.6rem;
  }
}
<<<END>>>