.page-about {
  background: var(--abyss);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(32px, 6vw, 68px) 0 clamp(32px, 5vw, 52px);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(56% 68% at 82% 0%, rgba(61, 242, 219, 0.13), transparent 70%),
    radial-gradient(44% 58% at 4% 100%, rgba(255, 138, 61, 0.09), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(22px, 4vw, 36px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

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

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 6vw, 54px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 54ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--deep);
  box-shadow: var(--shadow);
  overflow: hidden;
}

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

/* ---------- 章节索引 ---------- */
.page-about .about-index-nav {
  margin-top: clamp(32px, 5vw, 48px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-index {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index::-webkit-scrollbar {
  display: none;
}

.page-about .about-index li {
  flex: 0 0 auto;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--cyan-lt);
  border-color: rgba(61, 242, 219, 0.55);
  background: rgba(61, 242, 219, 0.08);
}

.page-about .about-index a.is-active,
.page-about .about-index a[aria-current] {
  color: var(--cyan);
  border-color: rgba(61, 242, 219, 0.65);
  background: rgba(61, 242, 219, 0.1);
}

/* ---------- 通用章节 ---------- */
.page-about .about-sec {
  padding: clamp(48px, 8vw, 96px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--nav-h) + 24px);
}

.page-about .about-sec--last {
  padding-bottom: clamp(56px, 9vw, 110px);
}

.page-about .about-sec__head {
  max-width: 68ch;
}

.page-about .about-sec__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-sec__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 3.6vw, 34px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-sec__lead {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 双栏说明块 ---------- */
.page-about .about-split {
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

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

.page-about .about-split__text {
  margin: 0 0 16px;
  font-size: clamp(15px, 1.6vw, 16px);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-split__text:last-child {
  margin-bottom: 0;
}

.page-about .about-split__aside {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(14, 34, 60, 0.92), rgba(8, 23, 43, 0.92));
  padding: 20px;
  box-shadow: var(--shadow);
}

.page-about .about-split__label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-pillars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-pillars li {
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
  padding-left: 14px;
  border-left: 1px solid rgba(61, 242, 219, 0.35);
}

.page-about .about-pillars__k {
  display: block;
  margin-bottom: 2px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--paper);
}

/* ---------- 时间线 ---------- */
.page-about .about-figure {
  margin: clamp(24px, 4vw, 36px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--deep);
  overflow: hidden;
  box-shadow: var(--shadow);
}

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

.page-about .about-figure__cap {
  padding: 12px 18px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .timeline {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(35, 64, 95, 0.25));
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 34px 38px;
}

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

.page-about .timeline__dot {
  position: absolute;
  left: 0;
  top: 12px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--abyss);
  box-shadow: 0 0 0 4px rgba(61, 242, 219, 0.08);
}

.page-about .timeline__year {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(34px, 8vw, 44px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: rgba(243, 247, 250, 0.92);
}

.page-about .timeline__body {
  margin-top: 10px;
  min-width: 0;
}

.page-about .timeline__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .timeline__text {
  margin: 8px 0 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 12 格矩阵 ---------- */
.page-about .matrix {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .matrix__cell {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(14, 34, 60, 0.9), rgba(8, 23, 43, 0.9));
  padding: 16px 14px;
  min-width: 0;
  transition: border-color 0.22s var(--ease), box-shadow 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .matrix__cell:hover,
.page-about .matrix__cell:focus-within {
  border-color: rgba(61, 242, 219, 0.5);
  box-shadow: 0 12px 26px -20px rgba(61, 242, 219, 0.75);
  transform: translateY(-2px);
}

.page-about .matrix__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(159, 180, 199, 0.8);
}

.page-about .matrix__name {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .matrix__desc {
  margin: 6px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-matrix__foot {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 242, 219, 0.4);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

/* ---------- 团队数据 ---------- */
.page-about .stat-row {
  margin-top: clamp(24px, 4vw, 36px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .stat {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(14, 34, 60, 0.55);
  padding: 16px;
  min-width: 0;
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4vw, 32px);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 服务覆盖 ---------- */
.page-about .coverage {
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .coverage__media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--deep);
  overflow: hidden;
  box-shadow: var(--shadow);
}

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

.page-about .coverage__figures {
  min-width: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  align-content: start;
}

.page-about .coverage__item {
  border-top: 1px solid var(--line);
  padding-top: 12px;
  min-width: 0;
}

.page-about .coverage__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 3.4vw, 28px);
  line-height: 1.15;
  color: var(--paper);
}

.page-about .coverage__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .coverage__note {
  grid-column: 1 / -1;
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 响应承诺 ---------- */
.page-about .promise {
  margin-top: clamp(24px, 4vw, 36px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(255, 138, 61, 0.11), rgba(14, 34, 60, 0.9) 46%, rgba(5, 11, 20, 0.92));
  padding: clamp(20px, 4vw, 38px);
  box-shadow: var(--shadow);
}

.page-about .promise__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .promise__item {
  display: grid;
  gap: 6px;
  padding-left: 14px;
  border-left: 2px solid rgba(255, 138, 61, 0.5);
}

.page-about .promise__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber-lt);
}

.page-about .promise__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--paper);
}

.page-about .promise__actions {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 138, 61, 0.28);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 页尾入口 ---------- */
.page-about .about-links {
  margin-top: clamp(24px, 4vw, 36px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--deep);
  text-decoration: none;
  transition: border-color 0.22s var(--ease), background-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  border-color: rgba(61, 242, 219, 0.5);
  background: rgba(14, 34, 60, 0.95);
  transform: translateY(-2px);
}

.page-about .about-link__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-link__t {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.5;
  color: var(--paper);
}

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: clamp(32px, 4vw, 56px);
    align-items: center;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }

  .page-about .timeline::before {
    left: 148px;
  }

  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 0 48px;
    padding: 0 0 44px 0;
  }

  .page-about .timeline__dot {
    left: 141px;
    top: 14px;
  }

  .page-about .timeline__year {
    font-size: clamp(42px, 4.6vw, 58px);
    text-align: left;
  }

  .page-about .timeline__body {
    margin-top: 4px;
  }

  .page-about .coverage {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 44px;
    align-items: center;
  }

  .page-about .stat-row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .promise__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 36px;
  }
}

@media (min-width: 1080px) {
  .page-about .matrix {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .matrix__cell {
    padding: 18px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .matrix__cell,
  .page-about .about-link,
  .page-about .about-index a {
    transition: none;
  }

  .page-about .matrix__cell:hover,
  .page-about .matrix__cell:focus-within,
  .page-about .about-link:hover,
  .page-about .about-link:focus-visible {
    transform: none;
  }
}
<<<END>>>
```