.page-about {
  --about-pad-x: clamp(20px, 3.6vw, 48px);
  --about-pad-y: clamp(30px, 4.5vw, 56px);
  --about-toc-w: 210px;
  background: var(--deep);
  color: var(--cream);
}

/* ---------- 首屏 ---------- */
.about-hero {
  padding: clamp(24px, 4vw, 52px) 0 clamp(28px, 4.5vw, 60px);
}

.page-about .about-hero .breadcrumb__list {
  list-style: none;
  margin: 0 0 clamp(18px, 3vw, 30px);
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
}

.page-about .about-hero .breadcrumb__link {
  color: var(--on-dark-dim);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .about-hero .breadcrumb__link:hover,
.page-about .about-hero .breadcrumb__link:focus-visible {
  color: var(--cyan);
}

.page-about .about-hero .breadcrumb__current {
  color: var(--cyan-mist);
}

.about-hero__grid {
  display: grid;
  gap: clamp(24px, 3.5vw, 38px);
}

@media (min-width: 920px) {
  .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: clamp(28px, 4vw, 64px);
  }
}

.about-eyebrow {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-deep);
}

.about-eyebrow--on-dark {
  color: var(--cyan);
}

.about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(29px, 5vw, 56px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.about-hero__lede {
  margin: 20px 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.35vw, 17px);
  line-height: 1.78;
  color: var(--on-dark);
}

.about-hero__lead .btn-row {
  margin-top: 26px;
}

.about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-cyan-soft);
  border: 1px solid var(--line-cyan);
  border-radius: var(--r-md);
  overflow: hidden;
}

.about-fact {
  background: var(--midnight);
  padding: 16px 15px;
}

.about-fact__num {
  display: block;
  font-size: clamp(23px, 2.9vw, 32px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--cyan);
}

.about-fact__label {
  display: block;
  margin-top: 7px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--on-dark-dim);
}

/* ---------- 主壳与目录 ---------- */
.about-shell {
  display: grid;
  gap: clamp(16px, 2vw, 26px);
  padding-bottom: clamp(40px, 6vw, 84px);
}

.about-shell__main {
  min-width: 0;
  background: var(--cream);
  color: var(--ink);
  border-radius: var(--r-lg);
  overflow: hidden;
}

@media (min-width: 1080px) {
  .about-shell {
    grid-template-columns: minmax(0, 1fr) var(--about-toc-w);
    align-items: start;
    gap: var(--gap);
  }
}

.about-shell__toc {
  order: -1;
  min-width: 0;
}

.about-shell__toc .toc__title {
  display: none;
}

.about-shell__toc .toc__list {
  list-style: none;
  margin: 0;
  padding: 2px 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.about-shell__toc .toc__item {
  flex: 0 0 auto;
}

.about-shell__toc .toc__link {
  display: inline-block;
  padding: 7px 15px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-cyan-soft);
  color: var(--on-dark-dim);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.about-shell__toc .toc__link:hover,
.about-shell__toc .toc__link:focus-visible {
  color: var(--cyan);
  border-color: var(--line-cyan);
}

.about-shell__toc .toc__link[aria-current="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--deep);
}

@media (min-width: 1080px) {
  .about-shell__toc {
    order: 0;
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .about-shell__toc .toc__title {
    display: block;
    margin: 0 0 10px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--on-dark-dim);
  }

  .about-shell__toc .toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .about-shell__toc .toc__item {
    flex: 1 1 auto;
    min-width: 0;
  }

  .about-shell__toc .toc__link {
    display: block;
    padding: 9px 12px;
    border-radius: var(--r-sm);
    border: 0;
    border-left: 2px solid transparent;
    font-size: 14px;
    white-space: normal;
  }

  .about-shell__toc .toc__link:hover,
  .about-shell__toc .toc__link:focus-visible {
    background: rgba(34, 211, 238, 0.10);
    color: var(--cyan);
  }

  .about-shell__toc .toc__link[aria-current="true"] {
    background: rgba(34, 211, 238, 0.12);
    color: var(--cyan);
    border-left-color: var(--orange);
  }
}

/* ---------- 通用区块 ---------- */
.about-block {
  padding: var(--about-pad-y) var(--about-pad-x);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.about-block--cream {
  background: var(--cream);
  color: var(--ink);
}

.about-block--sand {
  background: var(--sand);
  color: var(--ink);
}

.about-block--deep {
  background: var(--deep);
  color: var(--cream);
}

.about-block--midnight {
  background: var(--midnight);
  color: var(--cream);
}

.about-block__head {
  max-width: 66ch;
}

.about-h2 {
  margin: 12px 0 0;
  font-size: clamp(22px, 3.1vw, 33px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.02em;
}

.about-lede {
  margin: 15px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--graphite);
}

.about-block--deep .about-lede,
.about-block--midnight .about-lede {
  color: var(--on-dark);
}

/* ---------- 时间线 ---------- */
.timeline__track {
  list-style: none;
  margin: 30px 0 8px;
  padding: 0;
  display: flex;
  position: relative;
}

.timeline__track::before {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  top: 10px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan) 0%, rgba(34, 211, 238, 0.22) 100%);
}

.timeline__node {
  flex: 1 1 0;
  min-width: 0;
  position: relative;
}

.timeline__link {
  display: inline-flex;
  flex-direction: column;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}

.timeline__dot {
  box-sizing: border-box;
  display: block;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--cream);
  border: 3px solid var(--cyan);
  position: relative;
  z-index: 1;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.timeline__link:hover .timeline__dot,
.timeline__link:focus-visible .timeline__dot {
  background: var(--orange);
  border-color: var(--orange);
}

.timeline__label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--graphite);
  transition: color 0.18s var(--ease);
}

.timeline__link:hover .timeline__label,
.timeline__link:focus-visible .timeline__label {
  color: var(--cyan-deep);
}

.stage {
  display: grid;
  gap: 16px;
  padding: 26px 0;
  border-top: 1px solid var(--line-ink);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.stage:first-child {
  border-top: 0;
  padding-top: 12px;
}

@media (min-width: 900px) {
  .stage {
    grid-template-columns: minmax(0, 3.2fr) minmax(0, 7fr);
    gap: 34px;
    padding: 34px 0;
  }
}

.stage__index {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan-deep);
}

.stage__title {
  margin: 8px 0 0;
  font-size: clamp(19px, 2.3vw, 25px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.stage__verdict {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--graphite);
}

.stage__body p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.78;
}

.stage__body p:last-child {
  margin-bottom: 0;
}

.stage__figure {
  margin: 20px 0 0;
}

.media {
  display: block;
  overflow: hidden;
  border-radius: var(--r-md);
  background: linear-gradient(140deg, var(--deep), var(--midnight));
}

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

.page-about .media--4x3 img {
  aspect-ratio: 4 / 3;
}

.page-about .media--16x9 img {
  aspect-ratio: 16 / 9;
}

.page-about .media__caption {
  margin: 0;
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--graphite);
  background: var(--sand);
}

/* ---------- 数据带（顿点） ---------- */
.about-interrupt {
  margin: 26px 0 8px;
  padding: clamp(24px, 3.4vw, 40px) clamp(18px, 2.6vw, 34px);
  background: var(--deep);
  color: var(--cream);
  border-radius: var(--r-md);
  background-image: radial-gradient(circle at 88% 12%, rgba(34, 211, 238, 0.16), transparent 58%);
}

.about-interrupt__kicker {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.about-interrupt__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
}

@media (min-width: 760px) {
  .about-interrupt__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }
}

.about-interrupt__item {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.about-interrupt__num {
  font-size: clamp(30px, 4.2vw, 50px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.about-interrupt__desc {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--on-dark-dim);
}

/* ---------- 团队 ---------- */
.hive {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

@media (min-width: 700px) {
  .hive {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    padding-bottom: 34px;
  }

  .hive__cell:nth-child(even) {
    margin-top: 30px;
  }
}

@media (min-width: 1120px) {
  .hive {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }
}

.hive__cell {
  background: var(--cream);
  border: 1px solid rgba(42, 33, 28, 0.10);
  border-radius: var(--r-md);
  padding: 20px 17px 22px;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.hive__cell:hover,
.hive__cell:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-1);
}

.hive__badge {
  display: grid;
  place-items: center;
  width: 38px;
  height: 42px;
  margin-bottom: 14px;
  background: var(--cyan);
  color: var(--deep);
  font-size: 15px;
  font-weight: 900;
  clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
}

.hive__title {
  margin: 0;
  font-size: 16.5px;
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.hive__desc {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--graphite);
}

/* ---------- 资料体系 ---------- */
.library {
  display: grid;
  gap: 24px;
  margin-top: 30px;
}

@media (min-width: 900px) {
  .library {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 34px;
    align-items: start;
  }
}

.library__figure {
  margin: 0;
}

.library__tree {
  list-style: none;
  margin: 0;
  padding: 0;
}

.library__level {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 15px 0;
  border-top: 1px solid var(--line-ink);
}

.library__level:last-child {
  border-bottom: 1px solid var(--line-ink);
}

.library__key {
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--cyan-deep);
  padding-top: 3px;
}

.library__name {
  margin: 0;
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.library__level p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--graphite);
}

.library__notes {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.library__notes li {
  position: relative;
  padding-left: 19px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink);
}

.library__notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--orange);
  border-radius: 2px;
  transform: rotate(45deg);
}

/* ---------- 使用场景 ---------- */
.coverage {
  display: grid;
  gap: 28px;
  margin-top: 30px;
}

@media (min-width: 980px) {
  .coverage {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 40px;
    align-items: start;
  }
}

.coverage__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.coverage__item {
  padding: 18px 0;
  border-top: 1px solid var(--line-cyan-soft);
}

.coverage__item:first-child {
  border-top: 0;
  padding-top: 0;
}

.coverage__when {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  background: rgba(34, 211, 238, 0.12);
  border: 1px solid var(--line-cyan);
  color: var(--cyan);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.coverage__what {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--on-dark);
}

.coverage__map {
  border: 1px solid var(--line-cyan-soft);
  border-radius: var(--r-md);
  padding: 18px;
  background: rgba(255, 255, 255, 0.04);
}

.coverage__svg {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-sm);
}

.coverage__geo {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.coverage__geoItem {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.coverage__geoNum {
  flex: 0 0 auto;
  min-width: 62px;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
}

.coverage__geoLabel {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--on-dark-dim);
}

/* ---------- 合作与认证 ---------- */
.partners__figure {
  margin: 30px 0 0;
}

.partners__grid {
  display: grid;
  gap: 22px;
  margin-top: 28px;
}

@media (min-width: 820px) {
  .partners__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 34px;
  }
}

.partners__title {
  margin: 0;
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.partners__col p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--graphite);
}

.cert {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 16px;
  margin-top: 28px;
  padding: 20px 22px;
  background: var(--cream);
  border: 1px solid rgba(42, 33, 28, 0.10);
  border-left: 3px solid var(--orange);
  border-radius: var(--r-md);
}

.cert__badge {
  flex: 0 0 auto;
  padding: 5px 12px;
  border-radius: var(--r-sm);
  background: var(--deep);
  color: var(--cyan);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.cert__text {
  flex: 1 1 260px;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink);
}

/* ---------- 接下来 ---------- */
.next__list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.next__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px 0;
  border-top: 1px solid var(--line-cyan-soft);
}

.next__item:first-child {
  border-top: 0;
  padding-top: 0;
}

@media (min-width: 760px) {
  .next__item {
    grid-template-columns: 62px minmax(0, 1fr);
    gap: 22px;
  }
}

.next__index {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--orange);
  padding-top: 2px;
}

.next__item p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--on-dark);
}

.next__actions {
  margin-top: 28px;
}
<<<END>>>