.page-about {
  --about-rail-w: 148px;
  --about-gap: clamp(24px, 4vw, 64px);
  background: var(--mist);
  color: var(--ink);
}

.page-about a:focus-visible {
  outline: 2px solid var(--electric);
  outline-offset: 3px;
}

.page-about .h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.018em;
  color: var(--ink);
  margin: 0;
}

.page-about .h3 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  margin: 0 0 8px;
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(24px, 5vw, 56px)) 0 clamp(44px, 7vw, 80px);
  color: var(--mist);
  background:
    radial-gradient(90% 70% at 88% 2%, rgba(79, 209, 197, 0.16), transparent 62%),
    radial-gradient(72% 60% at 4% 98%, rgba(47, 125, 109, 0.22), transparent 62%),
    linear-gradient(168deg, var(--ink) 0%, var(--ink-2) 64%, #0d2138 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: repeating-linear-gradient(115deg, rgba(201, 211, 221, 0.07) 0 1px, transparent 1px 26px);
  -webkit-mask-image: radial-gradient(120% 82% at 82% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(120% 82% at 82% 0%, #000 0%, transparent 72%);
}

.page-about .about-hero__crumbs {
  margin-bottom: clamp(26px, 5vw, 48px);
}

.page-about .about-hero__crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(201, 211, 221, 0.78);
}

.page-about .about-hero__crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(201, 211, 221, 0.4);
}

.page-about .about-hero__crumbs a {
  color: var(--electric);
  text-decoration: none;
}

.page-about .about-hero__crumbs a:hover {
  text-decoration: underline;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  align-items: center;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(29px, 5.1vw, 56px);
  line-height: 1.14;
  letter-spacing: -0.022em;
  color: #fff;
  margin: 14px 0 20px;
  max-width: 17em;
}

.page-about .about-hero .lede {
  font-size: clamp(15px, 1.45vw, 17.5px);
  line-height: 1.8;
  color: rgba(244, 247, 250, 0.82);
  max-width: 46ch;
  margin: 0 0 28px;
}

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

.page-about .about-hero__visual {
  position: relative;
  border: var(--hair) solid rgba(201, 211, 221, 0.22);
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(160deg, rgba(31, 78, 121, 0.55), rgba(47, 125, 109, 0.35));
  box-shadow: 0 34px 64px -34px rgba(0, 0, 0, 0.85);
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(34px, 6vw, 62px) 0 0;
  padding: 0;
  background: rgba(201, 211, 221, 0.17);
  border: var(--hair) solid rgba(201, 211, 221, 0.17);
}

.page-about .about-figures__item {
  background: rgba(11, 29, 51, 0.68);
  padding: 16px 18px 18px;
}

.page-about .about-figures dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--silver);
  margin-bottom: 8px;
}

.page-about .about-figures dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(21px, 3vw, 29px);
  letter-spacing: -0.01em;
  color: #fff;
}

.page-about .about-figures dd em {
  font-style: normal;
  font-weight: 500;
  font-size: 0.46em;
  margin-left: 4px;
  color: var(--electric);
}

/* ---------- 左右错落骨架 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-top: 8px;
  border-top: var(--hair) solid rgba(11, 29, 51, 0.16);
}

.page-about .about-rail__num {
  font-size: clamp(26px, 3.2vw, 36px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--indigo);
}

.page-about .about-rail__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--indigo);
}

.page-about .about-rail--dark {
  border-top-color: rgba(201, 211, 221, 0.24);
}

.page-about .about-rail--dark .about-rail__num {
  color: var(--electric);
}

.page-about .about-rail--dark .about-rail__label {
  color: var(--silver);
}

.page-about .about-split__body > p {
  font-size: 16px;
  line-height: 1.85;
  color: rgba(11, 29, 51, 0.78);
  max-width: 64ch;
  margin: 18px 0 0;
}

.page-about .about-points {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-points li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 14px 16px;
  background: #fff;
  border-left: 2px solid var(--terra);
  border-radius: 0 var(--radius) var(--radius) 0;
  box-shadow: 0 10px 24px -22px rgba(11, 29, 51, 0.7);
  font-size: 14.8px;
  line-height: 1.7;
  color: rgba(11, 29, 51, 0.82);
}

.page-about .about-points .mono {
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--indigo);
  padding-top: 4px;
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  background: linear-gradient(178deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--mist);
  border-top: var(--hair) solid rgba(79, 209, 197, 0.18);
  border-bottom: var(--hair) solid rgba(79, 209, 197, 0.18);
}

.page-about .about-timeline .h2,
.page-about .about-timeline .h3 {
  color: #fff;
}

.page-about .about-track {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
}

.page-about .about-track__item {
  position: relative;
  padding: 0 0 28px 30px;
  border-left: var(--hair) solid rgba(201, 211, 221, 0.2);
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--electric);
  box-shadow: 0 0 0 4px rgba(79, 209, 197, 0.1);
}

.page-about .about-track__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-track__year {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--electric);
  margin-bottom: 8px;
}

.page-about .about-track__item p {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.8;
  color: rgba(244, 247, 250, 0.72);
  max-width: 60ch;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  position: relative;
  overflow: hidden;
  background: var(--mist);
}

.page-about .about-team::before {
  content: "";
  position: absolute;
  top: clamp(30px, 6vw, 70px);
  right: -12%;
  width: min(54%, 640px);
  height: clamp(150px, 22vw, 280px);
  pointer-events: none;
  background: linear-gradient(120deg, rgba(31, 78, 121, 0.18), rgba(47, 125, 109, 0.14));
  clip-path: polygon(16% 0, 100% 0, 84% 100%, 0 100%);
}

.page-about .about-team__layout {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: 28px;
}

.page-about .about-fold {
  border: var(--hair) solid rgba(11, 29, 51, 0.14);
  background: #fff;
  border-radius: var(--radius);
  margin-bottom: 12px;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-fold[open] {
  border-color: rgba(31, 78, 121, 0.42);
  box-shadow: 0 18px 34px -28px rgba(11, 29, 51, 0.6);
}

.page-about .about-fold__head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-fold__head::-webkit-details-marker {
  display: none;
}

.page-about .about-fold__num {
  font-size: 19px;
  font-weight: 700;
  color: var(--indigo);
  min-width: 2.6ch;
  letter-spacing: -0.01em;
}

.page-about .about-fold__name {
  flex: 1 1 auto;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15.5px;
  color: var(--ink);
}

.page-about .about-fold__hint {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--terra);
  white-space: nowrap;
}

.page-about .about-fold__hint::after {
  content: "+";
  margin-left: 6px;
  font-size: 13px;
}

.page-about .about-fold[open] .about-fold__hint::after {
  content: "−";
}

.page-about .about-fold__panel {
  padding: 0 18px 18px;
}

.page-about .about-fold__panel p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(11, 29, 51, 0.76);
}

.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius);
  border: var(--hair) solid rgba(11, 29, 51, 0.14);
  background: linear-gradient(150deg, rgba(31, 78, 121, 0.16), rgba(47, 125, 109, 0.14));
}

.page-about .about-team__figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(11, 29, 51, 0.6);
  border-left: 2px solid var(--terra);
  padding-left: 12px;
}

/* ---------- 服务方法 ---------- */
.page-about .about-section-head {
  max-width: 62ch;
}

.page-about .about-section-head .h2 {
  margin-top: 10px;
}

.page-about .about-section-head p:not(.eyebrow) {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(11, 29, 51, 0.74);
}

.page-about .about-steps {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-step {
  background: #fff;
  border: var(--hair) solid rgba(11, 29, 51, 0.12);
  border-top: 2px solid var(--indigo);
  border-radius: 0 0 var(--radius) var(--radius);
  padding: 20px 18px 22px;
}

.page-about .about-step:nth-child(2) {
  border-top-color: var(--terra);
}

.page-about .about-step:nth-child(3) {
  border-top-color: var(--electric);
}

.page-about .about-step:nth-child(4) {
  border-top-color: var(--cinnabar);
}

.page-about .about-step__num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--indigo);
  margin-bottom: 10px;
}

.page-about .about-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(11, 29, 51, 0.76);
}

.page-about .about-collab {
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 18px 20px;
  background: rgba(31, 78, 121, 0.06);
  border-left: 2px solid var(--indigo);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 14.8px;
  line-height: 1.8;
  color: rgba(11, 29, 51, 0.8);
  max-width: 80ch;
}

.page-about .about-collab .mono {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--indigo);
  margin-bottom: 6px;
}

/* ---------- 资质与生态 ---------- */
.page-about .about-trust {
  background:
    radial-gradient(80% 70% at 88% 6%, rgba(79, 209, 197, 0.12), transparent 62%),
    linear-gradient(196deg, var(--ink-2) 0%, var(--charcoal) 100%);
  color: var(--mist);
}

.page-about .about-trust .h2 {
  color: #fff;
}

.page-about .about-trust__grid {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  align-items: center;
}

.page-about .about-trust__copy > p {
  margin: 16px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(244, 247, 250, 0.76);
  max-width: 58ch;
}

.page-about .about-certs {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(201, 211, 221, 0.18);
  border: var(--hair) solid rgba(201, 211, 221, 0.18);
}

.page-about .about-certs li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  background: rgba(11, 29, 51, 0.62);
  padding: 14px 16px;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(244, 247, 250, 0.86);
}

.page-about .about-certs .mono {
  min-width: 8.5ch;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--electric);
}

.page-about .about-trust__note {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--terra);
  font-size: 14px !important;
  line-height: 1.8;
  color: rgba(201, 211, 221, 0.82) !important;
  max-width: 54ch;
}

.page-about .about-trust__figure {
  margin: 0;
}

.page-about .about-trust__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius);
  border: var(--hair) solid rgba(201, 211, 221, 0.22);
  background: rgba(255, 255, 255, 0.04);
}

.page-about .about-trust__figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  line-height: 1.7;
  color: rgba(201, 211, 221, 0.62);
}

/* ---------- 客户场景 ---------- */
.page-about .about-scenes__grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 38px);
}

.page-about .about-scene {
  background: #fff;
  border: var(--hair) solid rgba(11, 29, 51, 0.14);
  border-radius: var(--radius);
  padding: 22px 20px 24px;
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.page-about .about-scene:hover {
  transform: translateY(-3px);
  border-color: rgba(47, 125, 109, 0.42);
  box-shadow: 0 20px 36px -28px rgba(11, 29, 51, 0.6);
}

.page-about .about-scene .h3 {
  color: var(--indigo);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: var(--hair) solid rgba(11, 29, 51, 0.12);
}

.page-about .about-scene p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(11, 29, 51, 0.76);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--mist);
}

.page-about .about-next .h2 {
  color: #fff;
  max-width: 22ch;
}

.page-about .about-next__links {
  display: grid;
  gap: 1px;
  margin-top: 28px;
  background: rgba(201, 211, 221, 0.18);
  border: var(--hair) solid rgba(201, 211, 221, 0.18);
}

.page-about .about-next__link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 42px 20px 18px;
  background: rgba(11, 29, 51, 0.78);
  text-decoration: none;
  color: var(--mist);
  transition: background 0.3s var(--ease);
}

.page-about .about-next__link::after {
  content: "→";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  color: var(--electric);
  transition: transform 0.3s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: rgba(31, 78, 121, 0.88);
}

.page-about .about-next__link:hover::after {
  transform: translate(4px, -50%);
}

.page-about .about-next__label {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  color: #fff;
}

.page-about .about-next__desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(201, 211, 221, 0.74);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-scenes__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-next__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-track__item {
    display: grid;
    grid-template-columns: 150px minmax(0, 1fr);
    column-gap: 20px;
    padding-left: 34px;
  }

  .page-about .about-track__year {
    grid-column: 1;
    margin-bottom: 0;
    padding-top: 3px;
  }

  .page-about .about-track__item .h3,
  .page-about .about-track__item p {
    grid-column: 2;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-split {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-top: 10px;
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
  }

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: start;
  }

  .page-about .about-trust__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }
}

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-scene,
  .page-about .about-fold,
  .page-about .about-next__link,
  .page-about .about-next__link::after {
    transition: none;
  }

  .page-about .about-scene:hover {
    transform: none;
  }

  .page-about .about-next__link:hover::after {
    transform: translateY(-50%);
  }
}
<<<END>>>