.page-about {
  display: block;
  background: var(--space-black);
  color: var(--frost);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: clamp(20px, 3vw, 32px) 0 0;
}
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-data);
  font-size: var(--fs-14);
  color: var(--mist);
}
.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--steel);
}
.page-about .breadcrumb__list a {
  color: var(--mist);
  text-decoration: none;
}
.page-about .breadcrumb__list a:hover {
  color: var(--volt);
}
.page-about .breadcrumb__list [aria-current="page"] {
  color: var(--frost);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(40px, 7vw, 88px) 0 clamp(48px, 7vw, 88px);
  overflow: hidden;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -32%;
  width: clamp(260px, 46vw, 620px);
  height: clamp(260px, 46vw, 620px);
  background: radial-gradient(circle at 50% 50%, rgba(182, 255, 61, 0.16), rgba(182, 255, 61, 0) 62%);
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}
.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 7vw, 96px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--frost);
}
.page-about .about-hero__accent {
  color: var(--volt);
}
.page-about .about-hero__lede {
  max-width: 62ch;
  margin: clamp(20px, 3vw, 32px) 0 0;
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--steel);
  border: 1px solid var(--steel);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.page-about .about-hero__stats .stat {
  padding: 16px 18px;
  background: var(--graphite);
}
.page-about .about-hero__stats .stat__value {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--volt);
}
.page-about .about-hero__stats .stat__label {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-14);
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 主流程网格 ---------- */
.page-about .about-flow {
  padding-bottom: var(--gap-block);
}
.page-about .about-flow__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}
.page-about .about-flow__rail {
  display: none;
}
.page-about .about-flow__body {
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: clamp(44px, 6.5vw, 80px) 0;
}
.page-about .about-sec + .about-sec {
  border-top: 1px solid var(--steel);
}
.page-about .about-sec__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 4.2vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--frost);
}
.page-about .about-sec__lede {
  max-width: 64ch;
  margin: 14px 0 0;
  font-size: clamp(16px, 1.3vw, 18px);
  line-height: 1.78;
  color: var(--mist);
}
.page-about .about-sec__body {
  margin-top: 18px;
}
.page-about .about-sec__body p {
  max-width: 68ch;
  margin: 0 0 1.1em;
  font-size: 17px;
  line-height: 1.78;
  color: var(--mist);
}
.page-about .about-sec__body p:last-child {
  margin-bottom: 0;
}

.page-about .aside-note {
  margin-top: 26px;
  padding: 16px 18px;
  background: var(--graphite);
  border-left: 2px solid var(--signal);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.page-about .aside-note p {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 数据旅程 ---------- */
.page-about .about-journey__figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--graphite);
  border: 1px solid var(--steel);
}
.page-about .about-journey__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.85) brightness(0.95);
}

.page-about .about-pipe {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: pipe;
}
.page-about .about-pipe__step {
  position: relative;
  padding: 18px 18px 22px;
  background: var(--graphite);
  border: 1px solid var(--steel);
  border-radius: var(--radius-md);
}
.page-about .about-pipe__num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-data);
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--volt);
}
.page-about .about-pipe__name {
  margin: 0 0 8px;
  font-size: var(--fs-18);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--frost);
}
.page-about .about-pipe__desc {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-timing {
  margin-top: clamp(22px, 3.5vw, 34px);
  padding: 20px 18px 22px;
  background: var(--graphite);
  border: 1px solid var(--steel);
  border-radius: var(--radius-md);
}
.page-about .about-timing__title {
  margin: 0 0 16px;
  font-family: var(--font-data);
  font-size: var(--fs-14);
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--mist);
}
.page-about .about-timing__list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-timing__row {
  display: grid;
  grid-template-columns: minmax(60px, 84px) minmax(0, 1fr) minmax(72px, 92px);
  align-items: center;
  gap: 12px;
}
.page-about .about-timing__label {
  font-size: var(--fs-14);
  color: var(--frost);
}
.page-about .about-timing .data-bar {
  display: block;
  height: 6px;
  border-radius: var(--radius-pill);
  background: var(--space-black);
  overflow: hidden;
}
.page-about .about-timing .data-bar__fill {
  display: block;
  width: 0;
  height: 100%;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--signal), var(--volt));
  transition: width var(--dur-mid) var(--ease-spring);
}
.page-about .about-timing__val {
  font-family: var(--font-data);
  font-size: var(--fs-14);
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(24px, 4vw, 40px);
}
.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--graphite);
  border: 1px solid var(--steel);
}
.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.8) brightness(0.92);
}

.page-about .about-team__tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.page-about .about-team__tabs [role="tab"] {
  appearance: none;
  padding: 8px 16px;
  font-family: var(--font-body);
  font-size: var(--fs-14);
  font-weight: 600;
  color: var(--mist);
  background: var(--graphite);
  border: 1px solid var(--steel);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-spring),
    color var(--dur-fast) var(--ease-spring),
    border-color var(--dur-fast) var(--ease-spring);
}
.page-about .about-team__tabs [role="tab"]:hover {
  color: var(--frost);
  border-color: var(--signal);
}
.page-about .about-team__tabs [role="tab"][aria-selected="true"] {
  color: var(--space-black);
  background: var(--volt);
  border-color: var(--volt);
}
.page-about .about-team__tabs [role="tab"]:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.page-about .about-team__panel {
  padding: 18px 20px 20px;
  background: var(--graphite);
  border: 1px solid var(--steel);
  border-radius: var(--radius-md);
}
.page-about .about-team__panel + .about-team__panel {
  margin-top: 12px;
}
.page-about .about-team__panel:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}
.page-about .about-team__count {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: var(--fs-36);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--volt);
}
.page-about .about-team__desc {
  margin: 0 0 10px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--frost);
}
.page-about .about-team__shift {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--steel);
  font-size: var(--fs-14);
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 发展节点 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 0;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-timeline__item {
  position: relative;
  padding: 4px 0 28px 26px;
  border-left: 2px solid var(--steel);
}
.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}
.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--space-black);
  border: 2px solid var(--steel);
}
.page-about .about-timeline__item:last-child::before {
  background: var(--volt);
  border-color: var(--volt);
  box-shadow: 0 0 14px rgba(182, 255, 61, 0.55);
}
.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 700;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--mist);
}
.page-about .about-timeline__item:last-child .about-timeline__year {
  color: var(--volt);
}
.page-about .about-timeline__title {
  margin: 6px 0 8px;
  font-size: var(--fs-22);
  font-weight: 700;
  color: var(--frost);
}
.page-about .about-timeline__text {
  margin: 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-coverage__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  margin-top: clamp(24px, 4vw, 40px);
  align-items: center;
}
.page-about .about-coverage__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--graphite);
  border: 1px solid var(--steel);
}
.page-about .about-coverage__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.75) brightness(0.9);
}
.page-about .about-coverage__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--mist);
}
.page-about .about-coverage__list {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-coverage__list li {
  padding: 14px 16px;
  background: var(--graphite);
  border: 1px solid var(--steel);
  border-radius: var(--radius-md);
}
.page-about .about-coverage__k {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-data);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--signal);
}
.page-about .about-coverage__v {
  display: block;
  font-size: var(--fs-14);
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 资质与合规 ---------- */
.page-about .about-cred {
  margin-top: clamp(22px, 3.5vw, 36px);
  border: 1px solid var(--steel);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--graphite);
}
.page-about .about-cred__item {
  border-bottom: 1px solid var(--steel);
}
.page-about .about-cred__item:last-child {
  border-bottom: 0;
}
.page-about .about-cred__row {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 16px;
  cursor: pointer;
  list-style: none;
  transition: background var(--dur-fast) var(--ease-spring);
}
.page-about .about-cred__row::-webkit-details-marker {
  display: none;
}
.page-about .about-cred__row::marker {
  content: "";
}
.page-about .about-cred__row:hover {
  background: rgba(63, 200, 255, 0.06);
}
.page-about .about-cred__row:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: -2px;
}
.page-about .about-cred__icon {
  display: inline-flex;
  color: var(--signal);
}
.page-about .about-cred__name {
  font-size: 16px;
  font-weight: 600;
  color: var(--frost);
}
.page-about .about-cred__val {
  font-family: var(--font-data);
  font-size: var(--fs-14);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  color: var(--volt);
}
.page-about .about-cred__note {
  margin: 0;
  padding: 0 16px 18px 50px;
  max-width: 64ch;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 长期坚持 ---------- */
.page-about .about-sec--loose {
  padding-bottom: clamp(56px, 8vw, 100px);
}
.page-about .about-commit {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(28px, 4.5vw, 48px);
}
.page-about .about-commit__item {
  padding-top: 20px;
  border-top: 2px solid var(--steel);
}
.page-about .about-commit__idx {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-data);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--signal);
}
.page-about .about-commit__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--frost);
}
.page-about .about-commit__text {
  margin: 0;
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: clamp(36px, 5vw, 64px) 0 0;
  border-top: 1px solid var(--steel);
}
.page-about .about-next__lead {
  margin: 0 0 22px;
  max-width: 46ch;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.6;
  color: var(--frost);
}
.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-coverage__list {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 860px) {
  .page-about .about-pipe {
    grid-template-columns: 1.1fr 0.95fr 0.95fr 1.1fr;
    gap: 0;
  }
  .page-about .about-pipe__step {
    border-radius: 0;
    border-left-width: 0;
  }
  .page-about .about-pipe__step:first-child {
    border-left-width: 1px;
    border-radius: var(--radius-md) 0 0 var(--radius-md);
  }
  .page-about .about-pipe__step:last-child {
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
  }
  .page-about .about-commit {
    grid-template-columns: 1.15fr 0.95fr 1fr;
  }
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: 1.25fr 0.75fr;
    align-items: start;
  }
  .page-about .about-coverage__grid {
    grid-template-columns: 0.9fr 1.1fr;
  }
}

@media (min-width: 960px) {
  .page-about .about-flow__grid {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }
  .page-about .about-flow__rail {
    display: block;
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-compact) + 48px);
    width: 2px;
    height: min(58vh, 520px);
    margin-left: 34px;
    background: repeating-linear-gradient(
      to bottom,
      var(--steel) 0 16px,
      transparent 16px 32px
    );
  }
  .page-about .about-rail::before {
    content: "";
    position: absolute;
    top: 0;
    left: -3px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--volt);
    box-shadow: 0 0 14px rgba(182, 255, 61, 0.7);
  }
  .page-about .about-cred__note {
    padding-left: 50px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timing .data-bar__fill {
    transition: none;
  }
  .page-about .about-team__tabs [role="tab"],
  .page-about .about-cred__row {
    transition: none;
  }
}
<<<END>>>