.page-about {
  --about-line: 2px solid var(--ink-700);
  background: var(--ink-950);
  color: var(--fog);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--steel);
}
.page-about .breadcrumb li {
  display: inline-flex;
  align-items: center;
}
.page-about .breadcrumb li + li::before {
  content: "/";
  margin: 0 8px;
  color: var(--ink-700);
}
.page-about .breadcrumb a {
  color: var(--steel);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan);
}
.page-about .breadcrumb li[aria-current="page"] {
  color: var(--fog);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 40px) 0 60px;
  background:
    radial-gradient(680px 420px at 92% 0%, var(--cyan-08), transparent 68%),
    radial-gradient(520px 360px at 0% 14%, var(--orange-10), transparent 70%),
    var(--ink-950);
  border-bottom: var(--about-line);
}
.page-about .about-hero__grid {
  display: grid;
  gap: 34px;
}
.page-about .about-hero__copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 7.4vw, 78px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
.page-about .about-hero__mark {
  font-style: normal;
  color: var(--cyan);
}
.page-about .about-hero__lede {
  max-width: 46ch;
  margin: 22px 0 0;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--steel);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}
.page-about .about-hero__media {
  margin: 0;
  border: 2px solid var(--ink-700);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
  transform: rotate(-1.2deg);
}
.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}
.page-about .about-hero__media figcaption {
  padding: 10px 14px;
  border-top: var(--about-line);
  background: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--steel);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  padding: 60px 0;
}
.page-about .about-origin__inner {
  display: grid;
  gap: 20px;
}
.page-about .about-origin__index {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 42px;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--cyan);
}
.page-about .about-origin h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.page-about .about-origin__text p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--steel);
}
.page-about .about-origin__text p:first-child {
  font-size: 17px;
  color: var(--fog);
}
.page-about .about-origin__text p:last-child {
  margin-bottom: 0;
}

/* ---------- 数据来路 ---------- */
.page-about .about-flow {
  padding: 60px 0;
  background: var(--ink-900);
  border-top: var(--about-line);
  border-bottom: var(--about-line);
}
.page-about .about-flow__grid {
  display: grid;
  gap: 32px;
}
.page-about .about-flow__media {
  margin: 0;
  border: 2px solid var(--ink-700);
  background: var(--ink-800);
  box-shadow: var(--shadow-deep);
}
.page-about .about-flow__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-about .about-flow h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.page-about .about-flow__intro {
  margin: 18px 0 0;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--steel);
}
.page-about .about-flow__list {
  display: grid;
  gap: 2px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-flow__item {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 16px;
  background: var(--ink-800);
  border-left: 3px solid var(--ink-700);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.page-about .about-flow__item:hover {
  border-left-color: var(--cyan);
  background: var(--ink-700);
}
.page-about .about-flow__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 26px;
  line-height: 1.1;
  color: var(--cyan);
}
.page-about .about-flow__num small {
  margin-left: 2px;
  font-family: var(--font-label);
  font-size: 12px;
  font-weight: 600;
  color: var(--steel);
}
.page-about .about-flow__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--fog);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-version {
  position: relative;
  padding: 60px 0;
  background: var(--ink-950);
}
.page-about .about-version__glyph {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.14;
  filter: saturate(0.7);
  pointer-events: none;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 32%, #000 70%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 32%, #000 70%, transparent);
}
.page-about .about-version .container {
  position: relative;
  z-index: 1;
}
.page-about .about-version__head h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 4.4vw, 52px);
  line-height: 1.08;
  letter-spacing: -0.02em;
}
.page-about .about-version__sub {
  margin: 16px 0 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--steel);
}
.page-about .about-version__spark {
  display: block;
  width: 100%;
  max-width: 260px;
  height: auto;
  margin-top: 20px;
}
.page-about .about-version__track {
  position: relative;
  margin-top: 36px;
}
.page-about .about-version__list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-version__item {
  position: relative;
  padding: 24px 0 24px 18px;
  border-top: var(--about-line);
}
.page-about .about-version__item--current {
  border-top: 2px solid var(--orange);
}
.page-about .about-version__tag {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.page-about .about-version__ver {
  padding: 4px 12px;
  background: var(--cyan);
  color: var(--ink-950);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.04em;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}
.page-about .about-version__item--current .about-version__ver {
  background: var(--orange);
}
.page-about .about-version__stage {
  font-family: var(--font-label);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
}
.page-about .about-version__body h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 2.6vw, 30px);
  line-height: 1.16;
  letter-spacing: -0.01em;
}
.page-about .about-version__body p {
  margin: 0 0 10px;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--steel);
}
.page-about .about-version__body p:last-child {
  margin-bottom: 0;
}
.page-about .about-version__note {
  margin: 28px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--cyan);
  background: var(--ink-800);
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}
.page-about .about-version__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-16);
}
.page-about .about-version__note a:hover,
.page-about .about-version__note a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 服务规模 ---------- */
.page-about .about-scale {
  padding: 60px 0;
  border-top: var(--about-line);
}
.page-about .about-scale__head h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.page-about .about-scale__sub {
  margin: 14px 0 0;
  max-width: 50ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--steel);
}
.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  background: var(--ink-700);
  border: 2px solid var(--ink-700);
}
.page-about .about-scale__cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 16px;
  background: var(--ink-950);
}
.page-about .about-scale__value {
  display: flex;
  align-items: baseline;
  gap: 4px;
}
.page-about .about-scale__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(32px, 5vw, 50px);
  line-height: 1;
  color: var(--gold);
  text-shadow: 3px 3px 0 rgba(5, 8, 15, 0.9);
}
.page-about .about-scale__unit {
  font-family: var(--font-label);
  font-size: 15px;
  font-weight: 600;
  color: var(--steel);
}
.page-about .about-scale__cell p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--steel);
}

/* ---------- 资质 ---------- */
.page-about .about-cred {
  padding: 60px 0;
  background: var(--ink-900);
  border-top: var(--about-line);
  border-bottom: var(--about-line);
}
.page-about .about-cred__head h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.page-about .about-cred__grid {
  display: grid;
  gap: 18px;
  margin-top: 30px;
}
.page-about .about-cred__card {
  padding: 24px 20px;
  border: 2px solid var(--ink-700);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
  transition: transform 0.24s var(--ease), box-shadow 0.24s var(--ease), border-color 0.24s var(--ease);
}
.page-about .about-cred__card:hover,
.page-about .about-cred__card:focus-within,
.page-about .about-cred__card:focus-visible {
  transform: translateY(-4px);
  box-shadow: var(--shadow-deep);
  border-color: var(--cyan-16);
}
.page-about .about-cred__card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}
.page-about .about-cred__kicker {
  margin: 0 0 10px;
  font-family: var(--font-label);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
}
.page-about .about-cred__card h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 21px;
  line-height: 1.24;
  letter-spacing: -0.01em;
}
.page-about .about-cred__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel);
}
.page-about .about-cred__more {
  max-height: 0;
  margin-top: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.32s var(--ease), opacity 0.32s var(--ease), margin-top 0.32s var(--ease);
}
.page-about .about-cred__card:hover .about-cred__more,
.page-about .about-cred__card:focus-within .about-cred__more,
.page-about .about-cred__card:focus-visible .about-cred__more {
  max-height: 260px;
  margin-top: 12px;
  opacity: 1;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: 64px 0 84px;
}
.page-about .about-team__inner {
  max-width: 860px;
}
.page-about .about-team h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.page-about .about-team__prose {
  margin-top: 22px;
}
.page-about .about-team__prose p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--steel);
}
.page-about .about-team__prose p:first-child {
  color: var(--fog);
}
.page-about .about-team__roles {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-line);
}
.page-about .about-team__role {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: var(--about-line);
}
.page-about .about-team__role strong {
  font-family: var(--font-label);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-about .about-team__role p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--steel);
}
.page-about .about-team__foot {
  margin-top: 34px;
  padding: 20px 22px;
  border: 2px solid var(--ink-700);
  border-left: 4px solid var(--orange);
  background: var(--ink-900);
}
.page-about .about-team__foot p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel);
}
.page-about .about-team__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-16);
}
.page-about .about-team__foot a:hover,
.page-about .about-team__foot a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-scale__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-scale__cell {
    padding: 24px 20px;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 56px) 0 76px;
  }
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: 52px;
    align-items: end;
  }
  .page-about .about-origin {
    padding: 76px 0;
  }
  .page-about .about-origin__inner {
    grid-template-columns: 88px minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 44px;
    align-items: start;
  }
  .page-about .about-origin__text {
    padding-left: 22px;
    border-left: var(--about-line);
  }
  .page-about .about-flow {
    padding: 76px 0;
  }
  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 52px;
    align-items: center;
  }
  .page-about .about-version {
    padding: 76px 0;
  }
  .page-about .about-version__item {
    display: grid;
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 40px;
    padding: 32px 0;
  }
  .page-about .about-version__tag {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 0;
  }
  .page-about .about-scale {
    padding: 76px 0;
  }
  .page-about .about-cred {
    padding: 76px 0;
  }
  .page-about .about-cred__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
  }
  .page-about .about-team {
    padding: 80px 0 96px;
  }
  .page-about .about-team__roles {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__media {
    transform: rotate(-1.2deg) translateY(-12px);
  }
  .page-about .about-scale__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (hover: none) {
  .page-about .about-cred__more {
    max-height: none;
    margin-top: 12px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__media,
  .page-about .about-cred__card,
  .page-about .about-flow__item,
  .page-about .about-cred__more {
    transition: none;
    transform: none;
  }
}
<<<END>>>