.page-about {
  --about-glow: radial-gradient(circle at 50% 50%, rgba(255, 138, 24, .36), rgba(255, 138, 24, .10) 42%, rgba(255, 138, 24, 0) 72%);
  color: var(--halo);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 40px 0 64px;
  border-bottom: var(--line);
}

.page-about .about-hero__halo {
  position: absolute;
  top: -200px;
  right: -140px;
  width: min(720px, 130vw);
  height: min(720px, 130vw);
  background: var(--about-glow);
  pointer-events: none;
  animation: about-breathe 7s ease-in-out infinite;
}

@keyframes about-breathe {
  0%, 100% { opacity: .76; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.06); }
}

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

.page-about .about-hero__title {
  margin: 18px 0 22px;
  font-size: clamp(42px, 8.4vw, 112px);
  line-height: 1.02;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--halo);
}

.page-about .about-hero__lede {
  max-width: 640px;
  margin: 0;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
  margin-top: 48px;
  padding-top: 28px;
  border-top: var(--line);
}

.page-about .about-stat {
  min-width: 0;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 46px);
  font-weight: 900;
  line-height: 1;
  color: var(--sun);
  letter-spacing: -0.01em;
}

.page-about .about-stat__unit {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--slate);
}

/* ---------- 外壳：左侧光轨 + 正文流 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  padding-top: 56px;
  padding-bottom: 80px;
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: 88px;
  min-width: 0;
}

/* ---------- 侧边章节轨 ---------- */
.page-about .about-toc {
  min-width: 0;
}

.page-about .about-toc__cap {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--slate);
}

.page-about .about-toc__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 12px;
  list-style: none;
  overflow-x: auto;
  border-bottom: var(--line);
}

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 2px;
  white-space: nowrap;
  font-size: 14px;
  color: var(--slate);
  text-decoration: none;
  transition: color 160ms var(--ease);
}

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

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--sun);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  position: relative;
  min-width: 0;
}

.page-about .about-sec__head {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 36px;
}

.page-about .about-sec__label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 900;
  line-height: .86;
  color: var(--sun);
  opacity: .92;
}

.page-about .about-sec__note {
  display: none;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--slate);
  white-space: nowrap;
}

.page-about .about-sec__body {
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .about-sec__body .lede {
  max-width: 660px;
  margin: 14px 0 0;
}

.page-about .about-link {
  color: var(--sun);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 01 缘起 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .about-split__text p {
  margin: 0 0 18px;
  max-width: 680px;
}

.page-about .about-split__text p:last-of-type {
  margin-bottom: 22px;
}

.page-about .about-acc {
  border: var(--line);
  border-left: 4px solid var(--sun);
  background: var(--deep);
  padding: 4px 18px;
}

.page-about .about-acc .acc__summary {
  cursor: pointer;
  padding: 14px 0;
  font-weight: 700;
  font-size: 16px;
  color: var(--halo);
}

.page-about .about-acc .acc__body {
  padding: 0 0 16px;
  border-top: 1px solid var(--edge);
}

.page-about .about-acc .acc__body p {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--slate);
}

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

/* ---------- 02 阶段 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 3px;
  background: linear-gradient(180deg, var(--amber) 0%, var(--sun) 34%, var(--dawn) 68%, var(--edge) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 32px;
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: -34px;
  top: 12px;
  width: 14px;
  height: 14px;
  border: 3px solid var(--space);
  background: var(--sun);
}

.page-about .about-timeline__item:nth-child(1) .about-timeline__dot { background: var(--amber); }
.page-about .about-timeline__item:nth-child(2) .about-timeline__dot { background: var(--sun); }
.page-about .about-timeline__item:nth-child(3) .about-timeline__dot { background: var(--dawn); }
.page-about .about-timeline__item:nth-child(4) .about-timeline__dot { background: var(--halo); }

.page-about .about-timeline__card {
  background: var(--deep);
  border: var(--line);
  box-shadow: 6px 6px 0 0 var(--edge);
  padding: 22px 20px 20px;
  transition: border-color 160ms var(--ease);
}

.page-about .about-timeline__card:hover {
  border-color: var(--sun);
}

.page-about .about-timeline__era {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--dawn);
}

.page-about .about-timeline__card .h3 {
  margin: 0 0 10px;
}

.page-about .about-timeline__card p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--slate);
  max-width: 660px;
}

.page-about .about-timeline__fig {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--edge);
}

.page-about .about-timeline__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 900;
  line-height: 1;
  color: var(--halo);
}

.page-about .about-timeline__unit {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--slate);
}

.page-about .about-stages__media {
  margin: 36px 0 0;
}

/* ---------- 03 生态 ---------- */
.page-about .about-tabs {
  min-width: 0;
}

.page-about .about-tabs .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 14px;
  border-bottom: var(--line);
}

.page-about .about-tabs .tab {
  padding: 10px 18px;
  border: 2px solid var(--edge);
  background: transparent;
  color: var(--halo);
  font-family: inherit;
  font-size: 15px;
  cursor: pointer;
  transition: background 160ms var(--ease), border-color 160ms var(--ease), color 160ms var(--ease);
}

.page-about .about-tabs .tab:hover {
  border-color: var(--sun);
}

.page-about .about-tabs .tab[aria-selected="true"] {
  background: var(--sun);
  border-color: var(--sun);
  color: var(--space);
  font-weight: 700;
}

.page-about .about-tabs .tabpanel {
  padding-top: 26px;
}

.page-about .about-tabs .tabpanel[hidden] {
  display: none;
}

.page-about .about-panel__lede {
  max-width: 660px;
  margin: 0 0 22px;
  font-size: 17px;
  line-height: 1.75;
  color: var(--halo);
}

.page-about .about-panel p {
  max-width: 680px;
  margin: 18px 0 0;
  color: var(--slate);
  line-height: 1.75;
}

.page-about .about-genre {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-genre li {
  padding: 8px 0 8px 12px;
  border-left: 3px solid var(--sun);
  font-size: 15px;
  color: var(--halo);
}

.page-about .about-plate {
  border: var(--line);
  box-shadow: 8px 8px 0 0 var(--edge);
  background: var(--deep);
  padding: 6px 18px;
}

.page-about .about-plate .plate__row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--edge);
}

.page-about .about-plate .plate__row:last-child {
  border-bottom: 0;
}

.page-about .about-plate .plate__key {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--slate);
}

.page-about .about-plate .plate__val {
  font-weight: 700;
  color: var(--halo);
}

.page-about .about-facts {
  margin: 0;
  padding: 0;
  list-style: none;
  max-width: 680px;
}

.page-about .about-facts li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--edge);
}

.page-about .about-facts li:first-child {
  border-top: 3px solid var(--sun);
}

.page-about .about-facts__k {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--sun);
  min-width: 88px;
}

.page-about .about-facts__v {
  color: var(--halo);
}

/* ---------- 04 团队 ---------- */
.page-about .about-teams {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .about-team {
  padding-top: 20px;
  border-top: 3px solid var(--sun);
}

.page-about .about-team:nth-child(2) {
  border-top-color: var(--dawn);
}

.page-about .about-team:nth-child(3) {
  border-top-color: var(--amber);
}

.page-about .about-team__role {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--slate);
}

.page-about .about-team__num {
  margin: 10px 0 12px;
  font-family: var(--font-mono);
  font-size: clamp(38px, 6vw, 58px);
  font-weight: 900;
  line-height: 1;
  color: var(--halo);
}

.page-about .about-team__unit {
  margin-left: 6px;
  font-size: 15px;
  font-weight: 500;
  color: var(--slate);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-team__foot {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 40px;
  padding-top: 32px;
  border-top: var(--line);
}

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

.page-about .about-team__note p {
  margin: 0 0 16px;
  max-width: 620px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--halo);
}

.page-about .about-team__note p:last-child {
  margin-bottom: 0;
  color: var(--slate);
}

/* ---------- 05 覆盖 ---------- */
.page-about .about-reach {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--edge);
  border: var(--line);
}

.page-about .about-reach__cell {
  background: var(--deep);
  padding: 22px 18px;
}

.page-about .about-reach__k {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--dawn);
}

.page-about .about-reach__v {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--halo);
}

.page-about .about-reach__d {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
  justify-content: space-between;
  margin-top: 44px;
  padding: 28px 24px;
  border: var(--line);
  border-left: 4px solid var(--sun);
  background: linear-gradient(100deg, rgba(255, 138, 24, .16) 0%, rgba(255, 138, 24, 0) 62%);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 560px;
  font-size: 17px;
  line-height: 1.7;
  color: var(--halo);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-hero {
    padding: 56px 0 80px;
  }

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

  .page-about .about-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

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

  .page-about .about-sec__num {
    font-size: 56px;
  }
}

@media (min-width: 768px) {
  .page-about .about-sec__note {
    display: block;
  }

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

@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 80px 0 104px;
  }

  .page-about .about-shell {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 56px;
    padding-top: 72px;
    padding-bottom: 120px;
  }

  .page-about .about-toc {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 0;
    padding: 0 0 0 18px;
    overflow: visible;
    border-bottom: 0;
    position: relative;
  }

  .page-about .about-toc__list::before {
    content: "";
    position: absolute;
    left: 0;
    top: 6px;
    bottom: 6px;
    width: 3px;
    background: linear-gradient(180deg, var(--sun) 0%, var(--dawn) 58%, rgba(46, 55, 96, 0) 100%);
  }

  .page-about .about-toc__link {
    padding: 11px 0;
  }

  .page-about .about-flow {
    gap: 132px;
  }

  .page-about .about-sec__head {
    gap: 26px;
    margin-bottom: 44px;
  }

  .page-about .about-sec__num {
    font-size: 76px;
  }

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

  .page-about .about-timeline {
    padding-left: 40px;
  }

  .page-about .about-timeline__dot {
    left: -46px;
  }

  .page-about .about-timeline__card {
    padding: 28px 28px 24px;
  }

  .page-about .about-team__foot {
    grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
    margin-top: 56px;
    padding-top: 40px;
  }

  .page-about .about-cta {
    padding: 32px 36px;
    margin-top: 56px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-shell {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 72px;
  }

  .page-about .about-sec__num {
    font-size: 88px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__halo {
    animation: none;
  }

  .page-about .about-toc__link,
  .page-about .about-tabs .tab,
  .page-about .about-timeline__card {
    transition: none;
  }
}
<<<END>>>