.page-about {
  --about-axis: 1px;
  --about-node: 11px;
  --about-track-h: 8px;
  background: var(--space);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
}

.page-about .about-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(55, 230, 210, 0.4);
  padding-bottom: 1px;
  font-size: var(--fs-14);
  align-self: flex-start;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.page-about .about-band {
  padding: var(--sec-y) 0;
  position: relative;
}

.page-about .about-band--space {
  background: var(--space);
}

.page-about .about-band--nebula {
  background:
    radial-gradient(90% 70% at 12% 0%, rgba(59, 42, 107, 0.85), transparent 62%),
    var(--space);
}

.page-about .about-band--ink {
  background: var(--ink);
}

.page-about .about-band--paper {
  background: var(--paper);
  color: var(--paper-ink);
  border-top: 1px solid var(--red);
  border-bottom: 1px solid var(--red);
}

.page-about .about-band--paper h2,
.page-about .about-band--paper h3 {
  color: var(--paper-ink);
}

.page-about .about-band--paper .section-head__idx {
  color: var(--red);
}

.page-about .section-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(28px, 5vw, 52px);
  max-width: 46rem;
}

.page-about .section-head__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-about .section-head .t-lede {
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(116px, 17vh, 190px) 0 clamp(36px, 6vw, 72px);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(59, 42, 107, 0.95), transparent 62%),
    linear-gradient(180deg, var(--space) 0%, var(--ink) 100%);
}

.page-about .about-hero__frame {
  position: relative;
  margin-top: clamp(22px, 4vw, 40px);
  border: 1px solid var(--line-strong);
  overflow: hidden;
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 26px;
  height: 26px;
  border: 1px solid var(--amber);
  z-index: 2;
  pointer-events: none;
}

.page-about .about-hero__frame::before {
  top: 10px;
  left: 10px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__frame::after {
  bottom: 10px;
  right: 10px;
  border-left: 0;
  border-top: 0;
}

.page-about .about-hero__img {
  width: 100%;
  height: clamp(240px, 56vw, 560px);
  object-fit: cover;
  filter: saturate(0.9) contrast(1.06);
}

.page-about .about-hero__overlay {
  background: linear-gradient(180deg, rgba(6, 8, 20, 0.15), rgba(6, 8, 20, 0.96) 62%);
  padding: clamp(20px, 4vw, 34px);
  display: grid;
  gap: 12px;
  max-width: 62rem;
}

.page-about .about-hero h1 {
  margin: 0;
  font-size: clamp(2rem, 6.4vw, var(--fs-72));
  line-height: 1.04;
  color: var(--paper);
}

.page-about .about-hero .t-lede {
  margin: 0;
  color: var(--dust);
  max-width: 40rem;
}

/* ---------- 左留白 + 右密排 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-split__aside h2 {
  margin: 8px 0 20px;
  font-size: clamp(1.5rem, 4vw, var(--fs-28));
  color: var(--paper);
}

.page-about .about-index {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 18px;
}

.page-about .about-index a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  color: var(--dust);
  text-decoration: none;
  font-size: var(--fs-14);
}

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

.page-about .about-index .idx {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--gold);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: var(--about-axis);
  background: linear-gradient(180deg, var(--line-strong), rgba(167, 176, 201, 0.06));
}

.page-about .tl__item {
  position: relative;
  padding-bottom: clamp(28px, 4.5vw, 46px);
}

.page-about .tl__item:last-child {
  padding-bottom: 0;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 6px;
  width: var(--about-node);
  height: var(--about-node);
  background: var(--gold);
  box-shadow: 0 0 0 4px var(--space), 0 0 14px rgba(245, 194, 75, 0.55);
}

.page-about .tl__season {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .tl__title {
  margin: 8px 0 8px;
  font-size: clamp(1.125rem, 3.4vw, var(--fs-20));
  color: var(--paper);
}

.page-about .tl__body {
  margin: 0;
  max-width: 34rem;
  color: var(--dust);
  font-size: var(--fs-16);
  line-height: 1.75;
}

/* ---------- 三条业务线 ---------- */
.page-about .biz {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .biz__cell {
  padding: clamp(22px, 3.4vw, 38px);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .biz__cell--one {
  background: linear-gradient(160deg, var(--nebula), rgba(11, 16, 38, 0.92));
}

.page-about .biz__cell--two {
  background: var(--ink);
  border-top: 1px solid rgba(55, 230, 210, 0.35);
}

.page-about .biz__cell--three {
  background: var(--paper);
  color: var(--paper-ink);
}

.page-about .biz__title {
  margin: 0;
  font-size: clamp(1.0625rem, 3.2vw, var(--fs-20));
  line-height: 1.3;
}

.page-about .biz__cell--three .biz__title {
  color: var(--paper-ink);
}

.page-about .biz__text {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--dust);
}

.page-about .biz__cell--three .biz__text {
  color: rgba(20, 26, 46, 0.82);
}

.page-about .biz__cell--three .about-link {
  color: var(--volt-ink, #2440b8);
  border-bottom-color: rgba(36, 64, 184, 0.45);
}

/* ---------- 数据校验 ---------- */
.page-about .data-grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .data-lede {
  margin: 0 0 22px;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: rgba(20, 26, 46, 0.78);
}

.page-about .data-grid h2 {
  margin: 8px 0 14px;
  font-size: clamp(1.5rem, 4.4vw, var(--fs-28));
}

.page-about .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--line-paper);
}

.page-about .tab {
  appearance: none;
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  padding: 10px 0;
  margin-right: 22px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: rgba(20, 26, 46, 0.5);
  cursor: pointer;
}

.page-about .tab[aria-selected="true"] {
  color: var(--paper-ink);
  border-bottom-color: var(--red);
}

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

.page-about .tabpanel {
  padding-top: 18px;
}

.page-about .tabpanel[hidden] {
  display: none;
}

.page-about .data-step {
  margin: 0 0 8px;
  font-size: var(--fs-16);
  color: var(--paper-ink);
}

.page-about .tabpanel p {
  margin: 0;
  max-width: 36rem;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: rgba(20, 26, 46, 0.8);
}

.page-about .data-foot {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line-paper);
  font-size: var(--fs-14);
  color: rgba(20, 26, 46, 0.66);
}

.page-about .data-grid__figure {
  margin: 0;
  border: 1px solid var(--line-paper);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(26px, 4.5vw, 48px);
}

.page-about .team-grid__figure {
  margin: 0;
  border: 1px solid var(--line);
}

.page-about .team-grid h2 {
  margin: 8px 0 14px;
  font-size: clamp(1.5rem, 4.4vw, var(--fs-28));
  color: var(--paper);
}

.page-about .team-lede {
  margin: 0 0 26px;
  max-width: 38rem;
  color: var(--dust);
  font-size: var(--fs-16);
  line-height: 1.75;
}

.page-about .team-bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .team-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.page-about .team-bar__key {
  font-size: var(--fs-14);
  color: var(--paper);
}

.page-about .team-bar__num {
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  color: var(--amber);
}

.page-about .team-bar__track {
  display: block;
  height: var(--about-track-h);
  background: rgba(167, 176, 201, 0.14);
  border: 1px solid var(--line);
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--volt), var(--cyan));
}

.page-about .team-bar__fill--a {
  width: 65%;
}

.page-about .team-bar__fill--b {
  width: 23%;
}

.page-about .team-bar__fill--c {
  width: 12%;
}

.page-about .team-bar__note {
  margin: 8px 0 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--dust);
  max-width: 34rem;
}

.page-about .team-foot {
  margin: 26px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--dust);
}

/* ---------- 版本演进 ---------- */
.page-about .ver-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ver {
  position: relative;
  padding: 26px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .ver__dot {
  position: absolute;
  top: -6px;
  left: 0;
  width: var(--about-node);
  height: var(--about-node);
  background: var(--ink);
  border: 1px solid var(--gold);
}

.page-about .ver__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .ver__title {
  margin: 8px 0 8px;
  font-size: var(--fs-16);
  color: var(--paper);
}

.page-about .ver__text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--dust);
}

/* ---------- 节点 ---------- */
.page-about .grid-block {
  display: grid;
  gap: clamp(26px, 4.5vw, 52px);
}

.page-about .grid-block__intro h2 {
  margin: 8px 0 14px;
  font-size: clamp(1.5rem, 4.4vw, var(--fs-28));
  color: var(--paper);
}

.page-about .grid-block__intro p {
  margin: 0 0 20px;
  max-width: 38rem;
  color: var(--dust);
  font-size: var(--fs-16);
  line-height: 1.75;
}

.page-about .node-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  align-content: start;
}

.page-about .node {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  background: rgba(6, 8, 20, 0.72);
}

.page-about .node__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .node__name {
  font-size: var(--fs-16);
  color: var(--paper);
}

/* ---------- 备案与参与 ---------- */
.page-about .trust-stats {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .trust-band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .trust-band__line {
  margin: 0;
  max-width: 40rem;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--dust);
}

.page-about .trust-band__icp {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .trust-contact {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .trust-contact .contact-line__key {
  color: var(--dust);
}

.page-about .trust-contact .contact-line__val {
  color: var(--paper);
}

.page-about .trust-foot {
  margin: 24px 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--dust);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-index {
    grid-template-columns: 1fr;
  }

  .page-about .data-grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
  }

  .page-about .grid-block {
    grid-template-columns: 1.25fr 0.75fr;
    align-items: start;
  }

  .page-about .ver-track {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 clamp(20px, 3vw, 32px);
  }

  .page-about .ver {
    padding: 26px 0 22px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__overlay {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: clamp(26px, 4vw, 56px);
    background: linear-gradient(180deg, transparent, rgba(6, 8, 20, 0.86) 40%, rgba(6, 8, 20, 0.97));
  }

  .page-about .about-split {
    grid-template-columns: minmax(190px, 260px) minmax(0, 1fr);
    gap: clamp(48px, 9vw, 130px);
  }

  .page-about .about-split__aside {
    position: sticky;
    top: 124px;
    align-self: start;
  }

  .page-about .biz {
    grid-template-columns: 5fr 4fr 3fr;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(200px, 300px) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 80px);
  }

  .page-about .ver-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 clamp(22px, 3vw, 40px);
  }

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

  .page-about .trust-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
<<<END>>>