.page-about {
  --about-radius: 24px;
  --about-pad-y: clamp(44px, 7vw, 104px);
  --about-grid-line: rgba(111, 168, 220, .12);
}

.page-about .section {
  padding-block: var(--about-pad-y);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(26px, 4vw, 54px) clamp(46px, 6.5vw, 88px);
  background:
    radial-gradient(110% 90% at 6% -12%, rgba(20, 115, 212, .48) 0%, rgba(20, 115, 212, 0) 58%),
    radial-gradient(80% 70% at 100% 0%, rgba(34, 211, 238, .16) 0%, rgba(34, 211, 238, 0) 62%),
    linear-gradient(180deg, var(--c-deep) 0%, var(--c-deep) 70%, var(--c-deep-soft) 100%);
  color: var(--c-on-deep);
  overflow: hidden;
  border-bottom-left-radius: clamp(20px, 4vw, 44px);
  border-bottom-right-radius: clamp(20px, 4vw, 44px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-grid-line) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, .4) 60%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, .4) 60%, transparent 100%);
  pointer-events: none;
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(22px, 4vw, 42px);
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-on-deep-soft);
}

.page-about .breadcrumb a {
  color: var(--c-on-deep-soft);
  text-decoration: none;
  transition: color .2s ease;
}

.page-about .breadcrumb a:hover {
  color: var(--c-cyan);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(111, 168, 220, .55);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

@media (min-width: 980px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
  }
}

.page-about .about-hero .h-display {
  max-width: 820px;
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  color: var(--c-surface);
  line-height: 1.04;
}

.page-about .about-hero .p-lead {
  max-width: 62ch;
  margin: 0 0 clamp(24px, 3.4vw, 38px);
  color: var(--c-on-deep);
}

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

.page-about .about-hero__panel {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid rgba(111, 168, 220, .3);
  border-radius: var(--about-radius);
  background: rgba(10, 36, 64, .58);
  backdrop-filter: blur(8px);
}

.page-about .about-hero__panel .coord {
  display: block;
  margin: 0 0 18px;
  color: var(--c-cyan);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
  margin: 0;
}

.page-about .about-hero__fact dt {
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--c-on-deep-soft);
  margin-bottom: 6px;
}

.page-about .about-hero__fact dd {
  margin: 0;
  font-size: clamp(20px, 2.4vw, 26px);
  color: var(--c-surface);
  letter-spacing: .01em;
}

.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(30px, 5vw, 56px);
  padding-top: 20px;
  border-top: 1px solid rgba(111, 168, 220, .24);
}

.page-about .about-index a {
  display: inline-block;
  padding: 7px 15px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(111, 168, 220, .3);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--c-on-deep-soft);
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}

.page-about .about-index a:hover {
  color: var(--c-surface);
  border-color: var(--c-cyan);
}

.page-about .about-index a[data-current="true"] {
  color: var(--c-deep);
  background: var(--c-cyan);
  border-color: var(--c-cyan);
}

/* ---------- 章节头 ---------- */

.page-about .about-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: clamp(26px, 4vw, 50px);
}

@media (min-width: 760px) {
  .page-about .about-head {
    flex-direction: row;
    align-items: flex-start;
    gap: clamp(20px, 3vw, 46px);
  }
}

.page-about .index-num {
  display: block;
  flex: 0 0 auto;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(48px, 8vw, 104px);
  line-height: .82;
  letter-spacing: -.01em;
  color: transparent;
  -webkit-text-stroke: 1.4px var(--c-mist);
}

.page-about .about-head__text {
  padding-top: clamp(2px, 1vw, 14px);
}

.page-about .about-head__text .h-section {
  margin: 6px 0 0;
}

/* ---------- 01 服务版图 ---------- */

.page-about .about-map {
  display: grid;
  gap: clamp(26px, 4vw, 50px);
  align-items: start;
}

@media (min-width: 960px) {
  .page-about .about-map {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  }
}

.page-about .about-map__text .p-body + .p-body {
  margin-top: 16px;
}

.page-about .about-map__grid {
  list-style: none;
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

@media (min-width: 540px) {
  .page-about .about-map__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-map__grid li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 16px 18px;
  background: var(--c-surface);
}

.page-about .about-map__grid .mono {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-sel);
}

.page-about .about-map__grid strong {
  font-size: 15.5px;
  font-weight: 600;
  color: var(--c-ink);
}

.page-about .about-map__grid li > span:last-child {
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-body);
}

/* ---------- 媒体容器 ---------- */

.page-about .media {
  position: relative;
  margin: 0;
  border-radius: var(--about-radius);
  border: 1px solid var(--c-line);
  background: var(--c-deep-soft);
  overflow: hidden;
}

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

.page-about .media--16x9 { aspect-ratio: 16 / 9; }
.page-about .media--4x3 { aspect-ratio: 4 / 3; }

.page-about .media figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 40px 18px 16px;
  background: linear-gradient(180deg, rgba(6, 26, 46, 0) 0%, rgba(6, 26, 46, .88) 100%);
  color: var(--c-on-deep);
  font-size: 13px;
  line-height: 1.65;
}

/* ---------- 02 发展刻度 ---------- */

.page-about .about-tl-block__lead {
  max-width: 60ch;
  margin: calc(-1 * clamp(10px, 2vw, 22px)) 0 clamp(20px, 3vw, 34px);
}

.page-about .about-timeline {
  overflow-x: auto;
  overscroll-behavior-x: contain;
  padding-bottom: 18px;
  -webkit-overflow-scrolling: touch;
  scrollbar-color: var(--c-mist) transparent;
}

.page-about .about-timeline::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-timeline::-webkit-scrollbar-thumb {
  background: var(--c-mist);
  border-radius: var(--r-pill);
}

.page-about .about-timeline__track {
  display: flex;
  align-items: stretch;
  min-width: max-content;
  padding-inline: var(--shell-pad);
}

@media (min-width: 1380px) {
  .page-about .about-timeline__track {
    padding-inline: max(var(--shell-pad), calc((100vw - var(--shell-max)) / 2 + var(--shell-pad)));
  }
}

.page-about .about-era {
  position: relative;
  flex: 0 0 auto;
  width: min(76vw, 288px);
  padding: 26px 30px 4px 0;
  border-top: 1px solid var(--c-line);
  scroll-snap-align: start;
}

.page-about .about-era::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 52px;
  height: 2px;
  background: var(--c-amber);
}

.page-about .about-era__year {
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.1;
  color: var(--c-hi);
  letter-spacing: .02em;
  margin: 0 0 10px;
}

.page-about .about-era .h-card {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.45;
}

.page-about .about-era .p-body {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-body);
}

/* ---------- 03 选型与交付 ---------- */

.page-about .about-team {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: center;
}

@media (min-width: 980px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
  }
}

.page-about .about-team__text .p-body + .p-body {
  margin-top: 16px;
}

.page-about .about-promise {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-promise li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-body-strong);
}

.page-about .about-promise li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 10px;
  height: 2px;
  background: var(--c-sel);
}

.page-about .about-team__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-figure {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 18px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  background: var(--c-surface);
}

.page-about .about-figure__num {
  font-size: clamp(24px, 2.8vw, 32px);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--c-hi);
}

.page-about .about-figure__label {
  font-size: 13px;
  color: var(--c-body);
}

/* ---------- 04 质量与合规 ---------- */

.page-about .about-quality {
  background: linear-gradient(180deg, rgba(111, 168, 220, .12) 0%, rgba(111, 168, 220, 0) 72%);
}

.page-about .about-quality__lead {
  max-width: 66ch;
  margin: calc(-1 * clamp(10px, 2vw, 22px)) 0 clamp(24px, 3.5vw, 40px);
}

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

@media (min-width: 640px) {
  .page-about .about-cred {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-cred {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-cred__item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  padding: 22px 20px 24px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  background: var(--c-surface);
  transition: border-color .25s ease, transform .25s ease, box-shadow .25s ease;
}

.page-about .about-cred__item:hover {
  border-color: var(--c-mist);
  transform: translateY(-3px);
  box-shadow: 0 18px 36px -26px rgba(11, 59, 111, .6);
}

.page-about .about-cred__item .tag {
  margin-bottom: 4px;
}

.page-about .about-cred__code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-sel);
}

.page-about .about-cred__name {
  margin: 0;
  font-size: 16px;
  line-height: 1.45;
  font-weight: 600;
  color: var(--c-ink);
}

.page-about .about-cred__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-body);
}

/* ---------- 05 合作生态 ---------- */

.page-about .about-partners {
  display: grid;
  gap: clamp(28px, 4vw, 50px);
  align-items: center;
}

@media (min-width: 960px) {
  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
  }
}

.page-about .about-partners__text .p-body + .p-body {
  margin-top: 16px;
}

.page-about .about-partners__counts {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

@media (min-width: 520px) {
  .page-about .about-partners__counts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-partners__counts li {
  padding: 4px 0 4px 14px;
  border-left: 2px solid var(--c-amber);
}

.page-about .about-partners__counts .mono {
  display: block;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.1;
  color: var(--c-hi);
}

.page-about .about-partners__counts li > span:last-child {
  font-size: 13px;
  color: var(--c-body);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  padding-block: clamp(30px, 5vw, 72px) clamp(50px, 7vw, 110px);
}

.page-about .about-cta__box {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  align-items: center;
  padding: clamp(26px, 4vw, 54px);
  border-radius: clamp(20px, 3vw, 34px);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(34, 211, 238, .22) 0%, rgba(34, 211, 238, 0) 56%),
    linear-gradient(135deg, var(--c-deep) 0%, var(--c-hi) 100%);
  color: var(--c-on-deep);
}

@media (min-width: 880px) {
  .page-about .about-cta__box {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

.page-about .about-cta__box .eyebrow {
  color: var(--c-cyan);
}

.page-about .about-cta__box .h-section {
  margin: 8px 0 12px;
  color: var(--c-surface);
}

.page-about .about-cta__box .p-body {
  margin: 0;
  max-width: 60ch;
  color: var(--c-on-deep-soft);
}

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

/* ---------- 响应式细节 ---------- */

@media (max-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

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

  .page-about .about-era {
    width: min(84vw, 260px);
    padding-right: 22px;
  }
}

.page-about a:focus-visible,
.page-about .about-index a:focus-visible {
  outline: 2px solid var(--c-amber);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}
<<<END>>>