.page-about {
  --about-gap: clamp(20px, 4vw, 40px);
  --about-rule: 1px solid var(--line);
  padding-bottom: 72px;
}

.page-about .text-link {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 32px;
  padding-top: 26px;
  padding-bottom: 48px;
  border-bottom: var(--about-rule);
}

.page-about .about-hero__kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-label);
  font-size: 12.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .about-hero__kicker::before {
  content: "";
  width: 34px;
  height: 2px;
  background: var(--neon);
  flex: none;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7.2vw, 84px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .hl {
  color: var(--neon);
  font-style: normal;
}

.page-about .about-hero__lede {
  margin: 0 0 26px;
  max-width: 46ch;
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.85;
  color: var(--muted);
}

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

.page-about .stat-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 32px 0 0;
  background: var(--line);
  border: var(--about-rule);
}

.page-about .stat-strip__item {
  background: var(--ink-800);
  padding: 16px 18px;
}

.page-about .stat-strip__label {
  margin: 0 0 6px;
  font-family: var(--font-label);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .stat-strip__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--paper);
}

.page-about .stat-strip__value .num {
  font-size: 26px;
  color: var(--neon);
  font-weight: 700;
}

.page-about .about-hero__figure {
  margin: 0;
  aspect-ratio: 3 / 2;
  position: relative;
  align-self: start;
}

.page-about .about-hero__figure .media__img,
.page-about .about-figure .media__img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 正文骨架 ---------- */
.page-about .about-doc {
  display: grid;
  gap: 34px;
  padding-top: 46px;
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-label);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc__link {
  display: block;
  padding: 6px 0;
  font-size: 13.5px;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

.page-about .about-section {
  padding-bottom: 44px;
  margin-bottom: 44px;
  border-bottom: var(--about-rule);
}

.page-about .about-section__tag {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 12px;
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-section__tag .num {
  font-size: 15px;
  color: var(--neon);
}

.page-about .about-section__title {
  margin: 0 0 18px;
  max-width: 26ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.8vw, 40px);
  line-height: 1.24;
  color: var(--paper);
}

.page-about .about-section__text {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 两条主线 ---------- */
.page-about .axis-list {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  background: var(--line);
  border: var(--about-rule);
}

.page-about .axis {
  background: var(--ink-800);
  padding: 20px;
}

.page-about .axis__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .axis__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--paper);
}

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

/* ---------- 时间线 ---------- */
.page-about .timeline {
  display: flex;
  gap: 16px;
  margin: 30px 0 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
}

.page-about .timeline__item {
  position: relative;
  flex: 0 0 252px;
  padding-top: 26px;
  scroll-snap-align: start;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 11px;
  height: 11px;
  border: 2px solid var(--neon);
  border-radius: 50%;
  background: var(--ink-900);
}

.page-about .timeline__item::after {
  content: "";
  position: absolute;
  top: 5px;
  left: 11px;
  right: -16px;
  height: 1px;
  background: var(--line);
}

.page-about .timeline__item:last-child::after {
  display: none;
}

.page-about .tcard {
  border: var(--about-rule);
  background: var(--ink-800);
  padding: 14px 16px;
  height: 100%;
}

.page-about .tcard summary {
  display: block;
  list-style: none;
  cursor: pointer;
}

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

.page-about .tcard summary:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
}

.page-about .tcard__stage {
  display: block;
  margin-bottom: 7px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--neon);
}

.page-about .tcard__title {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .tcard__title::after {
  content: " +";
  font-family: var(--font-mono);
  color: var(--neon);
}

.page-about .tcard[open] .tcard__title::after {
  content: " −";
}

.page-about .tcard__body {
  margin: 12px 0 0;
  padding-top: 11px;
  border-top: 1px dashed var(--line);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 四层流程 ---------- */
.page-about .flow-layout {
  display: grid;
  gap: 24px;
  margin-top: 26px;
}

.page-about .flow-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: var(--about-rule);
}

.page-about .flow-card {
  background: var(--ink-700);
  padding: 20px;
}

.page-about .flow-card__step {
  display: inline-block;
  padding: 3px 9px;
  background: var(--paper);
  color: var(--ink-900);
  font-family: var(--font-label);
  font-size: 11.5px;
  letter-spacing: 0.16em;
}

.page-about .flow-card__title {
  margin: 14px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--paper);
}

.page-about .flow-card__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

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

.page-about .about-figure--square {
  aspect-ratio: 1 / 1;
}

.page-about .about-figure--wide {
  aspect-ratio: 12 / 7;
  margin-top: 26px;
}

.page-about .sla {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  background: var(--line);
  border: var(--about-rule);
}

.page-about .sla__item {
  background: var(--ink-900);
  padding: 18px 20px;
}

.page-about .sla__num {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0 0 6px;
  font-family: var(--font-mono);
  color: var(--neon);
}

.page-about .sla__num .num {
  font-size: 44px;
  font-weight: 700;
  line-height: 1;
}

.page-about .sla__unit {
  font-size: 14px;
  color: var(--neon-soft);
}

.page-about .sla__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.page-about .team-card {
  border: var(--about-rule);
  border-left: 3px solid var(--neon);
  background: var(--ink-800);
  padding: 20px;
}

.page-about .team-card__num {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  line-height: 1;
  color: var(--neon);
}

.page-about .team-card__num .num {
  font-size: 46px;
  font-weight: 700;
}

.page-about .team-card__role {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--paper);
}

.page-about .team-card__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-layout {
  display: grid;
  gap: 26px;
  margin-top: 6px;
}

.page-about .eco-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: var(--about-rule);
}

.page-about .eco-list li {
  padding: 14px 18px;
  background: var(--ink-800);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .eco-list .num {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--neon);
}

.page-about .eco-awards {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .award {
  background: var(--paper);
  color: var(--ink-900);
  padding: 18px 20px;
  box-shadow: var(--shadow-plate);
}

.page-about .award__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink-700);
}

.page-about .award__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .award__note {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--ink-700);
}

/* ---------- 版本 ---------- */
.page-about .version-band {
  display: grid;
  gap: 18px;
  margin-top: 22px;
  padding: 24px 22px;
  border: var(--about-rule);
  background: linear-gradient(135deg, var(--ink-700), var(--ink-900) 70%);
}

.page-about .version-band__num {
  margin: 0;
  font-family: var(--font-mono);
  line-height: 0.9;
  color: var(--neon);
}

.page-about .version-band__num .num {
  font-size: clamp(56px, 12vw, 96px);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-about .version-band__lead {
  margin: 0 0 10px;
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--neon-soft);
}

.page-about .version-band__text {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .next-links {
  display: grid;
  gap: 1px;
  margin-top: 22px;
  background: var(--line);
  border: var(--about-rule);
}

.page-about .next-link {
  display: block;
  padding: 16px 20px;
  background: var(--ink-800);
  text-decoration: none;
  transition: background var(--dur) var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  background: var(--ink-700);
}

.page-about .next-link__k {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-label);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .next-link__t {
  display: block;
  font-size: 14.5px;
  color: var(--paper);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  border: var(--about-rule);
  background: var(--ink-800);
  padding: 28px 22px;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0 0 22px;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .next-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .axis-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .version-band {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: center;
    gap: 28px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
    gap: 48px;
    padding-top: 40px;
    padding-bottom: 60px;
  }

  .page-about .flow-layout {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }

  .page-about .eco-layout {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    gap: 32px;
  }

  .page-about .about-cta {
    padding: 38px 34px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-doc {
    grid-template-columns: 186px minmax(0, 1fr);
    gap: 56px;
    padding-top: 56px;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
    align-self: start;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 0;
    border-left: var(--about-rule);
  }

  .page-about .about-toc__link {
    padding: 9px 0 9px 14px;
    margin-left: -1px;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    border-left-color: var(--neon);
    border-bottom-color: transparent;
  }

  .page-about .timeline__item {
    flex-basis: 268px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .next-link {
    transition: none;
  }
}
<<<END>>>