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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 44px) 0 clamp(34px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: min(52vw, 560px);
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.page-about .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 48px);
  margin-top: clamp(22px, 4vw, 42px);
}

.page-about .about-hero-lead {
  position: relative;
  padding-left: clamp(14px, 2vw, 24px);
}

.page-about .about-hero-lead::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), transparent 88%);
}

.page-about .about-hero h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 6.4vw, 4.4rem);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.035em;
  color: var(--paper);
}

.page-about .about-hero-body p {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: clamp(0.98rem, 1.1vw, 1.06rem);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding: clamp(38px, 6vw, 84px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-sec-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-bottom: clamp(24px, 3.4vw, 44px);
}

.page-about .chapter-no {
  font-size: clamp(2.2rem, 6vw, 4rem);
  line-height: 0.9;
}

.page-about .section-title {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.025em;
  color: var(--paper);
  max-width: 18em;
}

/* ---------- 01 历程 ---------- */
.page-about .about-lead-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-year {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: clamp(2.8rem, 9vw, 6rem);
  font-weight: 700;
  line-height: 0.84;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--teal);
}

.page-about .about-lead-copy p {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--mist);
}

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

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
  transition: border-color 0.2s var(--ease);
}

.page-about .about-figure:hover {
  border-color: var(--teal);
}

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

.page-about .about-figure .media-caption {
  padding: 12px 16px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

.page-about .about-figure--wide {
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px 20px;
  background: var(--panel);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.15rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .stat-label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 02 切换理念 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 52px);
}

.page-about .about-prose-item {
  border-top: 1px solid var(--line);
  padding-top: 16px;
  margin-top: 16px;
}

.page-about .about-prose-item:first-child {
  border-top: 0;
  padding-top: 0;
  margin-top: 0;
}

.page-about .about-prose-item h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.04rem;
  font-weight: 700;
  letter-spacing: 0.005em;
  color: var(--paper);
}

.page-about .about-prose-item h3::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-prose-item p {
  margin: 0;
  max-width: 34em;
  font-size: 0.96rem;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 中段引语 ---------- */
.page-about .about-quote {
  position: relative;
  padding: clamp(38px, 6vw, 82px) 0;
  background: var(--panel);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-quote::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(103deg, transparent 0 56%, rgba(71, 245, 211, 0.07) 56% 100%);
  pointer-events: none;
}

.page-about .about-quote .serif-note {
  position: relative;
  margin: 0;
  max-width: 22em;
  font-family: var(--font-serif);
  font-size: clamp(1.28rem, 2.9vw, 2.25rem);
  font-weight: 500;
  line-height: 1.55;
  color: var(--paper);
}

.page-about .about-quote-sign {
  position: relative;
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-quote-sign::before {
  content: "";
  display: inline-block;
  width: 26px;
  height: 1px;
  margin-right: 10px;
  vertical-align: middle;
  background: var(--amber);
}

/* ---------- 03 升级 ---------- */
.page-about .upgrade-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .upgrade-item {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease),
    box-shadow 0.18s var(--ease);
}

.page-about .upgrade-item::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 32px;
  height: 32px;
  border-top: 1px solid var(--cyan);
  border-right: 1px solid var(--cyan);
  opacity: 0.42;
  transition: width 0.18s var(--ease), height 0.18s var(--ease), opacity 0.18s var(--ease);
}

.page-about .upgrade-item:hover,
.page-about .upgrade-item:focus-within {
  transform: translateY(-3px);
  border-color: var(--cyan);
  box-shadow: 0 18px 38px rgba(0, 0, 0, 0.38);
}

.page-about .upgrade-item:hover::after,
.page-about .upgrade-item:focus-within::after {
  width: 48px;
  height: 48px;
  opacity: 1;
}

.page-about .upgrade-year {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--amber);
}

.page-about .upgrade-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .upgrade-item p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-inline-link {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 40em;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-inline-link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(71, 245, 211, 0.4);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

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

/* ---------- 04 本地服务与协作网络 ---------- */
.page-about .about-network {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 52px);
}

.page-about .about-network-copy p {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-network-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-network-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .net-tag {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--ink);
  background: var(--amber);
  padding: 3px 8px;
}

.page-about .about-network-svg {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  padding: 10px;
  background: var(--panel);
  border: 1px solid var(--line);
}

.page-about .about-network-svg .net-links line {
  stroke: var(--line);
  stroke-width: 1.2;
}

.page-about .about-network-svg .net-nodes circle {
  fill: var(--cyan);
  opacity: 0.85;
}

.page-about .about-network-svg .net-hub {
  fill: var(--amber);
}

.page-about .about-network-caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

/* ---------- 05 团队 ---------- */
.page-about .about-team-lead {
  margin: 0 0 clamp(22px, 3vw, 34px);
  max-width: 38em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .team-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-card {
  padding: 22px 20px 26px;
  background: var(--panel);
  transition: background 0.18s var(--ease);
}

.page-about .team-card:hover {
  background: #123529;
}

.page-about .team-card-num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--teal);
}

.page-about .team-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .team-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: clamp(38px, 6vw, 84px) 0;
}

.page-about .about-cta-inner {
  position: relative;
  padding: clamp(24px, 4vw, 46px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
}

.page-about .about-cta-text {
  margin: 14px 0 0;
  max-width: 36em;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-top-link {
  display: inline-block;
  margin-top: 26px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-sec-head {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 0 22px;
    align-items: start;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: end;
  }

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

  .page-about .upgrade-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (min-width: 980px) {
  .page-about .about-sec-head {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 0 28px;
  }

  .page-about .about-lead-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.88fr);
    align-items: start;
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-network {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
    align-items: center;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-figure,
  .page-about .upgrade-item,
  .page-about .upgrade-item::after,
  .page-about .team-card,
  .page-about .about-top-link,
  .page-about .about-inline-link a {
    transition: none;
  }
}
<<<END>>>