.page-about {
  background: var(--ink-900);
  color: var(--body-ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding: clamp(30px, 5.5vw, 68px) 0 clamp(44px, 7vw, 88px);
}
.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.26;
  z-index: -2;
}
.page-about .about-hero__glow {
  position: absolute;
  top: -240px;
  right: -140px;
  width: 540px;
  height: 540px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(45, 226, 230, 0.16), transparent 68%);
  filter: blur(40px);
  z-index: -1;
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 60px);
  align-items: start;
}
.page-about .about-hero__lead h1 {
  font-size: clamp(32px, 6vw, 54px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--mist);
  margin: 12px 0 18px;
}
.page-about .about-hero__sub {
  font-size: 16px;
  line-height: 1.85;
  color: var(--body-ink);
  max-width: 34em;
  margin-bottom: 26px;
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 版本索引卡 */
.page-about .about-hero__index {
  position: relative;
  border: 1px solid var(--line-soft);
  background: linear-gradient(160deg, rgba(11, 31, 58, 0.92), rgba(7, 20, 40, 0.94));
  padding: 24px 22px 20px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}
.page-about .about-hero__index::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 72px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
}
.page-about .about-hero__index-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--slate);
  margin-bottom: 16px;
}
.page-about .about-hero__index-title .mono {
  color: var(--amber);
  font-size: 11px;
}
.page-about .version-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .version-list__item {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-soft);
}
.page-about .version-list__item:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .version-list__no {
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: 0.08em;
  padding-top: 3px;
}
.page-about .version-list__body {
  display: grid;
  gap: 4px;
}
.page-about .version-list__body strong {
  color: var(--mist);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
}
.page-about .version-list__body span {
  color: var(--slate);
  font-size: 13px;
  line-height: 1.6;
}
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 20px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
}
.page-about .about-hero__stats > div {
  display: grid;
  gap: 2px;
}
.page-about .about-hero__stats dt {
  font-size: 15px;
  font-weight: 600;
  color: var(--gold-light);
  letter-spacing: 0.02em;
}
.page-about .about-hero__stats dd {
  margin: 0;
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--slate);
}

/* ---------- 演进历程 ---------- */
.page-about .about-timeline {
  padding: clamp(46px, 8vw, 96px) 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .about-timeline__head {
  max-width: 720px;
  margin-bottom: 34px;
}
.page-about .about-timeline__head h2 {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  line-height: 1.22;
  color: var(--mist);
  margin: 10px 0 14px;
}
.page-about .about-timeline__head p {
  color: var(--slate);
  font-size: 15px;
  line-height: 1.85;
}
.page-about .about-timeline__figure {
  position: relative;
  margin: 0 0 34px;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--ink-800);
}
.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .about-timeline__figure figcaption {
  position: absolute;
  left: 14px;
  bottom: 12px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mint);
  background: rgba(7, 20, 40, 0.72);
  border: 1px solid var(--line);
  padding: 4px 10px;
}
.page-about .about-timeline__tabslist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}
.page-about .about-timeline__tabslist .tabs__tab {
  appearance: none;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  padding: 10px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: transparent;
  color: var(--slate);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.page-about .about-timeline__tabslist .tabs__tab:hover {
  color: var(--mist);
  border-color: var(--line);
}
.page-about .about-timeline__tabslist .tabs__tab:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}
.page-about .about-timeline__tabslist .tabs__tab[aria-selected="true"] {
  color: var(--mist);
  font-weight: 600;
  border-color: var(--cyan);
  background: rgba(45, 226, 230, 0.08);
  box-shadow: 0 0 0 1px rgba(45, 226, 230, 0.24), 0 0 24px -10px rgba(45, 226, 230, 0.6);
}
.page-about .timeline-panel {
  max-width: 780px;
  padding: clamp(20px, 4vw, 32px);
  border: 1px solid var(--line-soft);
  background: var(--ink-800);
  border-radius: var(--radius);
}
.page-about .timeline-panel__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate);
  margin-bottom: 12px;
}
.page-about .timeline-panel__meta .mono {
  color: var(--amber);
  font-size: 12px;
}
.page-about .timeline-panel h3 {
  color: var(--mist);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 10px;
}
.page-about .timeline-panel p {
  color: var(--body-ink);
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(46px, 8vw, 96px) 0;
  border-top: 1px solid var(--line-soft);
  background: linear-gradient(180deg, transparent, rgba(11, 31, 58, 0.4) 55%, transparent);
}
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}
.page-about .about-team__intro h2 {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--mist);
  margin: 10px 0 16px;
}
.page-about .about-team__intro > p {
  color: var(--body-ink);
  font-size: 15px;
  line-height: 1.85;
  margin-bottom: 14px;
}
.page-about .about-team__note {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
  color: var(--slate);
  font-size: 12px;
  letter-spacing: 0.12em;
}
.page-about .about-team__note .mono {
  color: var(--amber);
  letter-spacing: 0.16em;
}
.page-about .about-team__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.page-about .team-card {
  position: relative;
  padding: 22px 22px 24px;
  border: 1px solid var(--line-soft);
  background: var(--ink-800);
  border-radius: var(--radius);
  transition: border-color 0.2s var(--ease);
}
.page-about .team-card:hover {
  border-color: var(--line);
}
.page-about .team-card__no {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}
.page-about .team-card h3 {
  color: var(--mist);
  font-size: 17px;
  font-weight: 600;
  margin: 8px 0;
}
.page-about .team-card p {
  color: var(--slate);
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- 服务网络 ---------- */
.page-about .about-network {
  padding: clamp(46px, 8vw, 96px) 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .about-network__head {
  max-width: 720px;
  margin-bottom: 30px;
}
.page-about .about-network__head h2 {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  line-height: 1.22;
  color: var(--mist);
  margin: 10px 0 14px;
}
.page-about .about-network__head p {
  color: var(--slate);
  font-size: 15px;
  line-height: 1.85;
}
.page-about .about-network__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  align-items: stretch;
}
.page-about .about-network__figure {
  margin: 0;
  display: flex;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--ink-800);
  border-radius: var(--radius);
}
.page-about .about-network__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .partner-list li {
  position: relative;
  padding: 20px 20px 20px 22px;
  border: 1px solid var(--line-soft);
  background: var(--ink-800);
  border-radius: var(--radius);
}
.page-about .partner-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), transparent);
}
.page-about .partner-list strong {
  display: block;
  color: var(--mist);
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}
.page-about .partner-list span {
  color: var(--slate);
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  padding: clamp(46px, 8vw, 96px) 0;
  border-top: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(11, 31, 58, 0.42), transparent);
}
.page-about .about-cadence h2 {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  line-height: 1.22;
  color: var(--mist);
  margin: 10px 0 14px;
}
.page-about .about-cadence > .shell > p:not(.eyebrow) {
  color: var(--slate);
  font-size: 15px;
  line-height: 1.85;
  max-width: 680px;
  margin-bottom: 30px;
}
.page-about .cadence-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .cadence-card {
  padding: 24px 22px;
  border: 1px solid var(--line-soft);
  background: var(--ink-800);
  border-radius: var(--radius);
}
.page-about .cadence-card__cycle {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold-light);
  background: rgba(245, 184, 75, 0.1);
  border: 1px solid rgba(245, 184, 75, 0.35);
  padding: 3px 9px;
  margin-bottom: 12px;
}
.page-about .cadence-card h3 {
  color: var(--mist);
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}
.page-about .cadence-card p {
  color: var(--slate);
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: clamp(44px, 7vw, 76px) 0 clamp(52px, 8vw, 92px);
}
.page-about .about-cta__inner {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  align-items: center;
  padding: clamp(24px, 4.5vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(140deg, rgba(45, 226, 230, 0.07), rgba(245, 184, 75, 0.04));
}
.page-about .about-cta__inner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 96px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
}
.page-about .about-cta__inner h2 {
  font-size: clamp(22px, 3.2vw, 28px);
  font-weight: 700;
  color: var(--mist);
  margin-bottom: 8px;
}
.page-about .about-cta__inner p {
  color: var(--slate);
  font-size: 15px;
  line-height: 1.75;
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 56px;
  }
  .page-about .about-team__cards {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    gap: 28px;
  }
  .page-about .about-network__figure img {
    height: 100%;
    min-height: 340px;
  }
  .page-about .cadence-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 32px;
  }
}

@media (min-width: 1120px) {
  .page-about .about-hero__grid {
    gap: 72px;
  }
  .page-about .about-hero__index {
    padding: 28px 26px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .about-timeline__tabslist .tabs__tab {
    transition: none;
  }
}
<<<END>>>