.page-about {
  --about-soft: rgba(232, 244, 255, 0.06);
  --about-rule: rgba(55, 242, 211, 0.18);
  --about-lift: #0d2742;
}

/* ---------- 页头 ---------- */
.page-about .about-head {
  position: relative;
  padding: clamp(26px, 5vw, 60px) 0 clamp(22px, 3vw, 38px);
  isolation: isolate;
}

.page-about .about-head::before {
  content: "";
  position: absolute;
  top: -14%;
  right: -6%;
  width: min(560px, 78vw);
  height: 320px;
  background:
    radial-gradient(58% 58% at 72% 32%, rgba(55, 242, 211, 0.16), transparent 72%),
    radial-gradient(52% 52% at 22% 72%, rgba(123, 97, 255, 0.14), transparent 74%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-head > * {
  position: relative;
  z-index: 1;
}

.page-about .about-head .page-head__title {
  font-size: clamp(30px, 5.6vw, 68px);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin: 10px 0 0;
}

.page-about .about-head .page-head__lede {
  max-width: 60ch;
  margin-top: 18px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-toc {
  display: flex;
  align-items: center;
  gap: 16px;
  overflow-x: auto;
  padding: 14px 0;
  border-top: 1px solid var(--grid-line);
  border-bottom: 1px solid var(--grid-line);
  margin-bottom: clamp(30px, 5vw, 62px);
  scrollbar-width: thin;
}

.page-about .about-toc__label {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--aqua);
  text-transform: uppercase;
}

.page-about .about-toc__list {
  display: flex;
  gap: clamp(14px, 2.6vw, 32px);
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-toc__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--aqua);
  border-bottom-color: var(--aqua);
}

.page-about .about-toc__list .num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--aqua);
}

/* ---------- 章节头 ---------- */
.page-about .chapter-no {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(46px, 9vw, 116px);
  font-weight: 700;
  line-height: 0.82;
  letter-spacing: -0.04em;
  color: var(--signal);
  opacity: 0.92;
  margin-bottom: 10px;
}

.page-about .sec-head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(24px, 4vw, 46px);
}

.page-about .sec-head .chapter-no {
  margin-bottom: 2px;
}

.page-about .sec-head h2 {
  font-size: clamp(24px, 3.6vw, 44px);
  font-weight: 300;
  line-height: 1.14;
  letter-spacing: -0.012em;
  margin: 0;
}

.page-about .sec-lede {
  max-width: 62ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 开篇 ---------- */
.page-about .open-grid {
  align-items: start;
  row-gap: clamp(24px, 4vw, 44px);
}

.page-about .open-copy h2 {
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 300;
  line-height: 1.16;
  margin: 0 0 18px;
  letter-spacing: -0.01em;
}

.page-about .open-copy p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 58ch;
}

.page-about .fact-line {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  list-style: none;
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--grid-line);
}

.page-about .fact-line--tight {
  margin-top: 22px;
}

.page-about .fact-line li {
  display: grid;
  gap: 3px;
}

.page-about .fact-line__n {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
}

.page-about .fact-line__l {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .open-figure {
  margin: 0;
}

.page-about .open-figure .media-frame {
  border-radius: 6px 26px 26px 26px;
}

/* ---------- 版本时间轴 ---------- */
.page-about .ver-grid {
  align-items: start;
  row-gap: clamp(26px, 4vw, 44px);
}

.page-about .ver-list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 34px;
  display: grid;
  gap: clamp(22px, 3vw, 38px);
}

.page-about .ver-list::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--aqua), var(--grid-line) 34%, var(--grid-line) 78%, transparent);
}

.page-about .ver {
  position: relative;
  padding-bottom: 4px;
}

.page-about .ver::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 15px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid var(--aqua);
  background: var(--deep);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .ver:hover::before,
.page-about .ver:focus-within::before {
  background: var(--aqua);
  box-shadow: 0 0 0 5px rgba(55, 242, 211, 0.14);
}

.page-about .ver__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--aqua);
  font-variant-numeric: tabular-nums;
}

.page-about .ver__title {
  font-size: clamp(17px, 2.1vw, 23px);
  font-weight: 500;
  line-height: 1.35;
  margin: 5px 0 8px;
  transition: color var(--dur) var(--ease);
}

.page-about .ver:hover .ver__title {
  color: var(--mist);
}

.page-about .ver__desc {
  margin: 0 0 10px;
  max-width: 54ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ver__desc a {
  color: var(--aqua);
  text-decoration: none;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .ver__desc a:hover {
  border-bottom-color: var(--aqua);
}

.page-about .ver__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ver__tags .pill {
  font-size: 11px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .ver:hover .ver__tags .pill {
  color: var(--mist);
  border-color: var(--grid-line);
}

.page-about .ver-figure {
  margin: 0;
  align-self: start;
}

.page-about .ver-figure .media-frame {
  border-radius: 26px 26px 6px 26px;
}

/* ---------- 团队矩阵 ---------- */
.page-about .team-matrix {
  list-style: none;
  margin: 0 0 clamp(30px, 5vw, 56px);
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.page-about .team {
  border: 1px solid var(--grid-line);
  border-left: 2px solid var(--aqua);
  border-radius: var(--r-md);
  background: var(--hull);
  padding: 18px 20px;
  display: grid;
  gap: 4px;
  min-width: 0;
  transition: background var(--dur) var(--ease), border-left-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .team:hover {
  background: var(--about-lift);
  border-left-color: var(--track);
  transform: translateY(-2px);
}

.page-about .team__n {
  font-family: var(--font-mono);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
}

.page-about .team__role {
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--aqua);
}

.page-about .team__desc {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 协作网络 ---------- */
.page-about .net-grid {
  align-items: start;
  row-gap: clamp(24px, 4vw, 40px);
}

.page-about .net-figure {
  margin: 0;
}

.page-about .net-figure .media-frame {
  border-radius: 26px 6px 26px 26px;
}

.page-about .net-copy__title {
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 400;
  line-height: 1.34;
  margin: 0 0 14px;
}

.page-about .net-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 58ch;
}

/* ---------- 服务地区 ---------- */
.page-about .region-grid {
  align-items: start;
  row-gap: clamp(24px, 4vw, 40px);
}

.page-about .region-hero {
  display: grid;
  align-content: start;
  gap: 6px;
  position: relative;
  padding: clamp(18px, 3vw, 30px);
  border: 1px solid var(--grid-line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(70% 70% at 20% 20%, rgba(55, 242, 211, 0.1), transparent 70%),
    var(--hull);
  overflow: hidden;
}

.page-about .region-hero__n {
  font-family: var(--font-mono);
  font-size: clamp(76px, 15vw, 168px);
  font-weight: 700;
  line-height: 0.86;
  letter-spacing: -0.05em;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

.page-about .region-hero__l {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 28ch;
}

.page-about .region-copy h2 {
  font-size: clamp(23px, 3.2vw, 38px);
  font-weight: 300;
  line-height: 1.18;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}

.page-about .region-copy p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 58ch;
}

.page-about .scene-tags {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .scene-tag {
  font-size: 13px;
  line-height: 1.5;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--grid-line);
  color: var(--mist);
  background: var(--about-soft);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .scene-tag:hover {
  color: var(--deep);
  background: var(--aqua);
  border-color: var(--aqua);
}

.page-about .region-copy__foot {
  margin: 0;
  font-size: 14px;
}

.page-about .region-copy__foot a {
  color: var(--aqua);
  text-decoration: none;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .region-copy__foot a:hover {
  border-bottom-color: var(--aqua);
}

/* ---------- 交付流程 ---------- */
.page-about .flow-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 14px;
  padding: 20px 0;
  border-top: 1px solid var(--grid-line);
  transition: background var(--dur) var(--ease);
}

.page-about .flow-step:last-child {
  border-bottom: 1px solid var(--grid-line);
}

.page-about .flow-step:hover {
  background: rgba(232, 244, 255, 0.03);
}

.page-about .flow-step__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--track);
  padding-top: 5px;
}

.page-about .flow-step__t {
  font-size: clamp(16px, 1.9vw, 19px);
  font-weight: 500;
  margin: 0 0 7px;
}

.page-about .flow-step__d {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 64ch;
}

/* ---------- 备案与联系 ---------- */
.page-about .info-band {
  display: grid;
  gap: 20px;
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--grid-line);
  border-radius: var(--r-lg);
  background:
    linear-gradient(150deg, rgba(55, 242, 211, 0.08), transparent 58%),
    var(--hull);
  min-width: 0;
}

.page-about .info-band__item {
  display: grid;
  gap: 5px;
  align-content: start;
  min-width: 0;
}

.page-about .info-band__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--aqua);
  text-transform: uppercase;
}

.page-about .info-band__v {
  font-size: 15px;
  line-height: 1.6;
  color: var(--mist);
  word-break: break-word;
}

.page-about a.info-band__v {
  text-decoration: none;
  border-bottom: 1px solid var(--grid-line);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about a.info-band__v:hover,
.page-about a.info-band__v:focus-visible {
  color: var(--aqua);
  border-bottom-color: var(--aqua);
}

.page-about .info-band__note {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .copy-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.page-about .record-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(22px, 3vw, 34px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .team-matrix {
    grid-template-columns: repeat(12, 1fr);
  }

  .page-about .team-matrix > li:nth-child(1) {
    grid-column: span 7;
  }

  .page-about .team-matrix > li:nth-child(2) {
    grid-column: span 5;
  }

  .page-about .team-matrix > li:nth-child(3) {
    grid-column: span 5;
  }

  .page-about .team-matrix > li:nth-child(4) {
    grid-column: span 7;
  }

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

  .page-about .flow-step {
    grid-template-columns: 64px 1fr;
  }
}

@media (max-width: 899px) {
  .page-about .open-grid,
  .page-about .ver-grid,
  .page-about .net-grid,
  .page-about .region-grid {
    display: block;
  }

  .page-about .open-grid > *,
  .page-about .ver-grid > *,
  .page-about .net-grid > *,
  .page-about .region-grid > * {
    width: 100%;
  }

  .page-about .open-figure,
  .page-about .ver-figure,
  .page-about .net-figure {
    margin-top: 26px;
  }

  .page-about .net-copy {
    margin-top: 22px;
  }

  .page-about .region-copy {
    margin-top: 24px;
  }
}

@media (max-width: 599px) {
  .page-about .ver-list {
    padding-left: 26px;
  }

  .page-about .ver-list::before {
    left: 6px;
  }

  .page-about .ver::before {
    left: -23px;
    width: 9px;
    height: 9px;
    top: 14px;
  }

  .page-about .about-toc {
    gap: 12px;
  }

  .page-about .fact-line {
    gap: 12px 22px;
  }

  .page-about .region-hero__n {
    letter-spacing: -0.04em;
  }
}
<<<END>>>