.page-about {
  display: block;
  background: var(--paper);
  color: var(--ink);
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--deep);
  color: var(--paper);
  padding: calc(var(--header-h) + clamp(40px, 8vw, 92px)) 0 clamp(40px, 7vw, 84px);
}

.page-about .about-hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: .38;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(61, 220, 151, .24), transparent 56%),
    linear-gradient(155deg, rgba(6, 32, 47, .92) 0%, rgba(11, 60, 93, .78) 48%, rgba(10, 14, 18, .96) 100%);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero .breadcrumb-list {
  color: rgba(245, 247, 242, .68);
}

.page-about .about-hero .breadcrumb-item a {
  color: var(--aurora);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb-item a:hover,
.page-about .about-hero .breadcrumb-item a:focus-visible {
  text-decoration: underline;
}

.page-about .about-hero .eyebrow {
  margin-top: clamp(18px, 3vw, 30px);
  color: var(--ember);
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .22em;
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: clamp(12px, 2vw, 20px) 0 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.2vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -.012em;
  color: #fff;
  max-width: 17ch;
}

.page-about .about-hero-lede {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.6vw, 1.14rem);
  line-height: 1.9;
  color: rgba(245, 247, 242, .86);
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 4vw, 44px);
  max-width: 880px;
  border-top: 1px solid rgba(185, 198, 206, .3);
  border-left: 1px solid rgba(185, 198, 206, .3);
}

.page-about .about-hero-stat {
  padding: clamp(14px, 2vw, 20px) clamp(12px, 2vw, 18px);
  border-right: 1px solid rgba(185, 198, 206, .3);
  border-bottom: 1px solid rgba(185, 198, 206, .3);
  background: rgba(6, 32, 47, .34);
}

.page-about .about-hero-stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.6vw, 1.85rem);
  line-height: 1.1;
  color: var(--aurora);
  letter-spacing: .01em;
}

.page-about .about-hero-stat-label {
  display: block;
  margin-top: 8px;
  font-size: .8rem;
  letter-spacing: .1em;
  color: var(--frost);
}

.page-about .about-index {
  margin-top: clamp(26px, 4vw, 40px);
  padding-top: clamp(14px, 2vw, 20px);
  border-top: 1px solid rgba(185, 198, 206, .28);
}

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

.page-about .about-index-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid rgba(185, 198, 206, .42);
  background: rgba(10, 14, 18, .3);
  color: var(--paper);
  font-size: .84rem;
  letter-spacing: .05em;
  text-decoration: none;
  transition: background .2s ease, border-color .2s ease, color .2s ease;
}

.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible {
  background: var(--aurora);
  border-color: var(--aurora);
  color: var(--deep);
}

.page-about .about-index-num {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--ember);
}

.page-about .about-index-link:hover .about-index-num,
.page-about .about-index-link:focus-visible .about-index-num {
  color: var(--deep);
}

/* ---------- 通用章节头 ---------- */

.page-about .about-head {
  max-width: 780px;
}

.page-about .about-head .eyebrow {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mid);
}

.page-about .about-head .section-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 4.2vw, 2.6rem);
  line-height: 1.14;
  letter-spacing: -.01em;
}

.page-about .about-head .section-lead {
  margin: 14px 0 0;
  font-size: clamp(.98rem, 1.5vw, 1.08rem);
  line-height: 1.88;
  color: var(--chalk);
}

.page-about .section--ice .about-head .section-title,
.page-about .section--deep .about-head .section-title {
  color: var(--paper);
}

.page-about .section--ice .about-head .section-lead,
.page-about .section--deep .about-head .section-lead {
  color: rgba(245, 247, 242, .78);
}

.page-about .section--ice .about-head .eyebrow,
.page-about .section--deep .about-head .eyebrow {
  color: var(--aurora);
}

/* ---------- 冰面起点 ---------- */

.page-about .about-origin-grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(22px, 3.5vw, 34px);
}

.page-about .about-origin-body p {
  margin: 1.1em 0 0;
  font-size: clamp(1rem, 1.5vw, 1.07rem);
  line-height: 1.92;
}

.page-about .about-origin-body .about-head + p {
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-origin-body strong {
  color: var(--ice);
  font-weight: 700;
}

.page-about .about-note-card {
  align-self: start;
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--shadow-plate);
}

.page-about .about-note-tag {
  display: inline-block;
  padding-bottom: 5px;
  border-bottom: 2px solid var(--ember);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ice);
}

.page-about .about-note-text {
  margin: 14px 0 0;
  font-size: .95rem;
  line-height: 1.86;
  color: var(--chalk);
}

/* ---------- 版本历程 ---------- */

.page-about .about-road-body {
  display: grid;
  gap: clamp(28px, 5vw, 54px);
  margin-top: clamp(26px, 4.5vw, 46px);
}

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

.page-about .about-road-figure .media-fill,
.page-about .about-team-figure .media-fill {
  position: relative;
  overflow: hidden;
}

.page-about .about-road-figure .media-fill img,
.page-about .about-team-figure .media-fill img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-road-figure .media-caption,
.page-about .about-team-figure .media-caption {
  margin-top: 10px;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--frost);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 21px;
  width: 1px;
  background: linear-gradient(180deg, var(--aurora), rgba(61, 220, 151, .12));
}

.page-about .about-node {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.page-about .about-node-num {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--aurora);
  background: var(--deep);
  color: var(--aurora);
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .04em;
}

.page-about .about-node-title {
  margin: 8px 0 0;
  font-size: clamp(1.02rem, 1.7vw, 1.16rem);
  font-weight: 800;
  color: #fff;
}

.page-about .about-node-text {
  margin: 8px 0 0;
  font-size: .95rem;
  line-height: 1.85;
  color: rgba(245, 247, 242, .8);
}

/* ---------- 团队 ---------- */

.page-about .about-team-tabs {
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .tab-list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  -webkit-overflow-scrolling: touch;
}

.page-about .tab {
  flex: 0 0 auto;
  padding: 10px 16px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--chalk);
  font-family: var(--font-body);
  font-size: .87rem;
  letter-spacing: .02em;
  white-space: nowrap;
  cursor: pointer;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}

.page-about .tab:hover {
  border-color: var(--mid);
  color: var(--ice);
}

.page-about .tab[aria-selected="true"] {
  background: var(--ice);
  border-color: var(--ice);
  color: var(--paper);
}

.page-about .tab:focus-visible {
  outline: 2px solid var(--ember);
  outline-offset: 2px;
}

.page-about .tab-panel {
  padding: clamp(22px, 3.4vw, 34px) 0 0;
}

.page-about .tab-panel[hidden] {
  display: none;
}

.page-about .about-team-panel {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
}

.page-about .about-team-count {
  padding-left: clamp(14px, 2vw, 20px);
  border-left: 4px solid var(--aurora);
}

.page-about .about-team-count-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 7vw, 3.6rem);
  line-height: 1;
  color: var(--ice);
}

.page-about .about-team-count-label {
  display: block;
  margin-top: 8px;
  font-size: .82rem;
  letter-spacing: .14em;
  color: var(--chalk);
}

.page-about .about-team-copy p {
  margin: 0;
  font-size: clamp(1rem, 1.5vw, 1.06rem);
  line-height: 1.9;
  color: var(--ink);
}

.page-about .about-team-figure {
  margin: clamp(30px, 5vw, 52px) 0 0;
}

/* ---------- 合作网络 ---------- */

.page-about .about-network-list {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  border-top: 1px solid rgba(185, 198, 206, .3);
}

.page-about .about-network-row {
  display: grid;
  gap: 6px 18px;
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-bottom: 1px solid rgba(185, 198, 206, .3);
}

.page-about .about-network-num {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--ember);
}

.page-about .about-network-title {
  margin: 0;
  font-size: clamp(1rem, 1.7vw, 1.14rem);
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-network-count {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 1.28rem;
  color: var(--aurora);
}

.page-about .about-network-text {
  margin: 0;
  font-size: .95rem;
  line-height: 1.88;
  color: rgba(245, 247, 242, .78);
}

.page-about .about-network-cta {
  margin-top: clamp(26px, 4vw, 40px);
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid rgba(61, 220, 151, .4);
  background: rgba(61, 220, 151, .08);
  display: grid;
  gap: 16px;
  justify-items: start;
}

.page-about .about-network-cta p {
  margin: 0;
  max-width: 62ch;
  font-size: .98rem;
  line-height: 1.85;
  color: rgba(245, 247, 242, .88);
}

/* ---------- 资质与荣誉 ---------- */

.page-about .about-ledger {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  border-top: 2px solid var(--ink);
}

.page-about .about-ledger-row {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 16px;
  padding: clamp(20px, 3vw, 28px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-ledger-num {
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--ember);
}

.page-about .about-ledger-title {
  margin: 0;
  font-size: clamp(1.02rem, 1.6vw, 1.16rem);
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-ledger-text {
  margin: 10px 0 0;
  font-size: .95rem;
  line-height: 1.88;
  color: var(--chalk);
}

/* ---------- 每日首屏 ---------- */

.page-about .about-first-grid {
  display: grid;
  gap: clamp(28px, 4.5vw, 52px);
}

.page-about .about-first-text .eyebrow {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--aurora);
}

.page-about .about-first-text .section-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 4.2vw, 2.6rem);
  line-height: 1.14;
  color: var(--paper);
}

.page-about .about-first-text p {
  margin: clamp(16px, 2.2vw, 22px) 0 0;
  font-size: clamp(.98rem, 1.5vw, 1.06rem);
  line-height: 1.9;
  color: rgba(245, 247, 242, .84);
}

.page-about .about-first-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .about-first-modules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid rgba(185, 198, 206, .3);
  background: rgba(185, 198, 206, .3);
}

.page-about .about-first-module {
  padding: clamp(16px, 2.4vw, 22px);
  background: rgba(6, 32, 47, .42);
}

.page-about .about-first-module-num {
  display: block;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--ember);
}

.page-about .about-first-module-title {
  margin: 8px 0 0;
  font-size: 1.04rem;
  font-weight: 800;
  color: #fff;
}

.page-about .about-first-module p {
  margin: 8px 0 0;
  font-size: .92rem;
  line-height: 1.8;
  color: rgba(245, 247, 242, .76);
}

/* ---------- 响应式 ---------- */

@media (min-width: 780px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-team-panel {
    grid-template-columns: minmax(0, .62fr) minmax(0, 1.38fr);
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .82fr);
    align-items: start;
    gap: clamp(34px, 5vw, 70px);
  }

  .page-about .about-road-body {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
    align-items: start;
  }

  .page-about .about-road-figure {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-ledger-row {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 24px;
  }

  .page-about .about-ledger-body {
    display: grid;
    grid-template-columns: minmax(0, .88fr) minmax(0, 1.12fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .about-ledger-text {
    margin-top: 0;
  }
}

@media (min-width: 960px) {
  .page-about .about-first-grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
    align-items: start;
  }
}

@media (max-width: 640px) {
  .page-about .about-hero h1 {
    max-width: none;
  }

  .page-about .about-index-list {
    flex-direction: column;
  }

  .page-about .about-index-link {
    width: 100%;
    justify-content: flex-start;
  }

  .page-about .about-node {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 12px;
  }

  .page-about .about-node-num {
    width: 36px;
    height: 36px;
    font-size: .72rem;
  }

  .page-about .about-timeline::before {
    left: 17px;
  }

  .page-about .about-first-actions .btn {
    width: 100%;
    text-align: center;
  }
}

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