.page-about {
  --about-pad: 20px;
  background:
    radial-gradient(1100px 560px at 88% -8%, rgba(26, 92, 255, 0.30), transparent 62%),
    radial-gradient(760px 520px at -6% 24%, rgba(0, 224, 198, 0.10), transparent 66%),
    var(--ink);
  color: var(--ice);
  overflow-x: hidden;
}

.page-about .about-hero {
  padding: 24px var(--about-pad) 48px;
}

.page-about .about-hero-inner {
  max-width: 1000px;
}

.page-about .about-hero .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--cyan);
  letter-spacing: 0.14em;
}

.page-about .hero-tick {
  display: inline-block;
  width: 26px;
  height: 2px;
  background: var(--gold);
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 9vw, 84px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--ice);
}

.page-about .about-hero-lead {
  max-width: 60ch;
  margin: 24px 0 0;
  font-size: 17px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-section {
  padding: 52px var(--about-pad);
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--line);
}

.page-about .about-section h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 5.2vw, 44px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--ice);
}

.page-about .about-section-lead {
  max-width: 58ch;
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .eyebrow.mono {
  color: var(--cyan);
  letter-spacing: 0.14em;
}

/* ---------- 起点 ---------- */

.page-about .about-origin-inner {
  display: grid;
  gap: 32px;
}

.page-about .about-origin-text .prose p {
  color: var(--mist);
  font-size: 16px;
  line-height: 1.85;
  margin: 16px 0 0;
}

.page-about .about-origin-text h2 + .prose p:first-child {
  margin-top: 20px;
}

.page-about .origin-points {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .origin-points li {
  display: grid;
  gap: 2px;
  padding: 14px 16px;
  border-left: 3px solid var(--blue);
  background: rgba(11, 30, 58, 0.66);
  color: var(--mist);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .origin-points .mono {
  color: var(--ice);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-origin-media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

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

.page-about .media-caption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  background: var(--ink-2);
}

.page-about .about-timeline-media {
  margin: 28px 0 0;
  border: 1px solid var(--line);
}

.page-about .about-timeline-layout {
  display: grid;
  gap: 26px;
  margin-top: 30px;
}

.page-about .year-index {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.page-about .year-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  background: rgba(6, 18, 37, 0.7);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .year-link:hover,
.page-about .year-link:focus-visible {
  color: var(--gold);
  border-color: var(--gold);
}

.page-about .timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .timeline-node {
  display: grid;
  gap: 10px;
  padding: 22px 18px 18px;
  background: rgba(6, 18, 37, 0.72);
  border: 1px solid var(--line);
  border-left: 3px solid var(--blue);
  box-shadow: var(--shadow-hard);
  scroll-margin-top: 110px;
}

.page-about .timeline-node--now {
  border-left-color: var(--gold);
}

.page-about .timeline-year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 6vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: rgba(155, 176, 204, 0.42);
}

.page-about .timeline-node--now .timeline-year {
  color: var(--gold);
}

.page-about .timeline-body h3 {
  margin: 0;
  font-size: 19px;
  line-height: 1.4;
  color: var(--ice);
}

.page-about .timeline-body > p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .timeline-more {
  margin-top: 6px;
  border-top: 1px dashed var(--line);
}

.page-about .timeline-more summary {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 8px 0;
  cursor: pointer;
  list-style: none;
  font-size: 14px;
  color: var(--link);
}

.page-about .timeline-more summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline-more summary::before {
  content: "+";
  width: 12px;
  font-family: var(--font-mono);
  color: var(--cyan);
}

.page-about .timeline-more[open] summary::before {
  content: "–";
}

.page-about .timeline-more p {
  margin: 2px 0 6px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .team-card {
  display: grid;
  gap: 6px;
  align-content: start;
  padding: 20px 18px 22px;
  background: rgba(11, 30, 58, 0.6);
  border: 1px solid var(--line);
}

.page-about .team-dots {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  min-height: 26px;
  margin-bottom: 8px;
}

.page-about .dot {
  display: block;
  width: 8px;
  height: 8px;
  background: var(--cyan);
}

.page-about .team-card:nth-child(2) .dot {
  background: var(--blue);
}

.page-about .team-card:nth-child(3) .dot {
  background: var(--gold);
}

.page-about .team-card:nth-child(4) .dot {
  background: var(--violet);
}

.page-about .team-card h3 {
  margin: 0;
  font-size: 18px;
  color: var(--ice);
}

.page-about .team-count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .team-card p:last-child {
  margin: 4px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-team-media {
  margin: 32px 0 0;
  border: 1px solid var(--line);
}

.page-about .team-flow {
  margin-top: 34px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.page-about .team-flow h3 {
  margin: 0;
  font-size: 20px;
  color: var(--ice);
}

.page-about .flow-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .flow-list li {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .flow-step {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

/* ---------- 内容标准 ---------- */

.page-about .standard-grid {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

.page-about .standard-main .prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .tag-row {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .standard-aside {
  padding: 22px 20px 24px;
  background: var(--frost);
  color: var(--frost-ink);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-hard);
}

.page-about .standard-aside-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: #3B5480;
}

.page-about .standard-aside-num {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 56px;
  line-height: 1;
  color: var(--blue);
}

.page-about .standard-aside-text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: #24406B;
}

/* ---------- 规模 ---------- */

.page-about .facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .fact {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .fact:first-child {
  border-top: 1px dashed var(--line);
}

.page-about .fact-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .fact p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 生态 ---------- */

.page-about .eco-strip {
  display: flex;
  gap: 12px;
  margin-top: 26px;
  padding: 4px 0 16px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  outline-offset: 4px;
}

.page-about .eco-strip:focus-visible {
  outline: 2px solid var(--cyan);
}

.page-about .eco-item {
  flex: 0 0 min(80%, 268px);
  scroll-snap-align: start;
  padding: 18px 16px 20px;
  background: rgba(11, 30, 58, 0.6);
  border: 1px solid var(--line);
  border-top: 3px solid var(--violet);
}

.page-about .eco-item:nth-child(2n) {
  border-top-color: var(--cyan);
}

.page-about .eco-item:nth-child(3n) {
  border-top-color: var(--gold);
}

.page-about .eco-tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .eco-item h3 {
  margin: 8px 0 0;
  font-size: 18px;
  color: var(--ice);
}

.page-about .eco-item p:last-child {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 接下来 ---------- */

.page-about .next-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .next-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.page-about .next-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .next-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 28px;
  line-height: 1;
  color: var(--blue);
}

.page-about .next-item h3 {
  margin: 0;
  font-size: 19px;
  line-height: 1.4;
  color: var(--ice);
}

.page-about .next-item p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-more {
  margin-top: 40px;
  padding-top: 26px;
  border-top: 3px solid var(--gold);
}

.page-about .about-more-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .more-links {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 24px;
}

.page-about .more-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 15px;
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

/* ---------- 断点 ---------- */

@media (min-width: 720px) {
  .page-about {
    --about-pad: 32px;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

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

  .page-about .fact {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

  .page-about .fact-num {
    font-size: 18px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 40px var(--about-pad) 72px;
  }

  .page-about .about-section {
    padding: 76px var(--about-pad);
  }

  .page-about .about-origin-inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-origin-media {
    margin-top: 8px;
  }

  .page-about .about-timeline-layout {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .year-index {
    position: sticky;
    top: 104px;
    flex-direction: column;
    overflow: visible;
    gap: 6px;
    padding-bottom: 0;
  }

  .page-about .year-link {
    justify-content: flex-start;
    border-color: transparent;
    background: transparent;
    padding-left: 0;
  }

  .page-about .timeline-node {
    grid-template-columns: minmax(0, 1fr);
    padding: 26px 26px 22px;
  }

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

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

  .page-about .standard-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.75fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .standard-aside-num {
    font-size: 72px;
  }

  .page-about .eco-item {
    flex-basis: 280px;
  }

  .page-about .next-item {
    gap: 28px;
    padding: 26px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .year-link,
  .page-about .more-link {
    transition: none;
  }

  .page-about .eco-strip {
    scroll-snap-type: none;
  }
}
<<<END>>>