.page-about {
  --about-gap: clamp(56px, 8vw, 104px);
  background: var(--ink);
  color: var(--porcelain);
  font-family: var(--font-body);
  line-height: 1.85;
  padding-bottom: clamp(48px, 7vw, 88px);
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0;
}

.page-about p {
  margin: 0;
}

.page-about .link {
  color: var(--lime-mist);
  text-decoration: underline;
  text-decoration-color: rgba(200, 255, 77, 0.45);
  text-underline-offset: 3px;
  transition: color 180ms var(--ease);
}

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

.page-about .section-head {
  max-width: 62ch;
}

.page-about .section-head__title {
  font-size: clamp(26px, 4vw, 42px);
  font-weight: 800;
  line-height: 1.08;
  margin-top: 6px;
}

.page-about .section-head__note {
  color: var(--slate);
  font-size: 15px;
  margin-top: 12px;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: clamp(16px, 2.4vw, 28px) var(--gutter) 0;
  background:
    radial-gradient(120% 90% at 85% -10%, rgba(36, 31, 74, 0.75), transparent 60%),
    var(--ink);
}

.page-about .about-hero__frame {
  position: relative;
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(26px, 5vw, 64px);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background:
    repeating-linear-gradient(115deg, rgba(169, 216, 230, 0.055) 0 1px, transparent 1px 16px),
    linear-gradient(155deg, rgba(12, 43, 34, 0.96), rgba(6, 26, 21, 0.86));
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 11px;
  border: 1px solid var(--line-soft);
  border-radius: calc(var(--radius-l) - 8px);
  pointer-events: none;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  top: -1px;
  left: clamp(26px, 5vw, 64px);
  width: 76px;
  height: 4px;
  background: var(--lime);
  border-radius: 0 0 4px 4px;
}

.page-about .breadcrumb {
  margin-bottom: 26px;
}

.page-about .about-hero__title {
  font-size: clamp(44px, 10vw, 126px);
  font-weight: 800;
  line-height: 0.92;
  letter-spacing: -0.02em;
  margin: 14px 0 0;
}

.page-about .about-hero__lede {
  max-width: 60ch;
  margin-top: 24px;
  font-size: clamp(16px, 1.7vw, 18px);
  color: var(--slate-lt);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 18px 24px;
  margin: 36px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-hero__stat dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-about .about-hero__stat .metric {
  display: block;
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__stat:nth-child(2) .metric {
  color: var(--amber);
}

.page-about .about-hero__stat .metric span {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 400;
  color: var(--slate-lt);
  margin-left: 5px;
}

/* ---------- 编年走廊 ---------- */
.page-about .chrono {
  margin-top: var(--about-gap);
  padding: clamp(40px, 6.5vw, 84px) 0;
  background:
    radial-gradient(90% 70% at 10% 0%, rgba(169, 216, 230, 0.1), transparent 60%),
    var(--indigo);
  border-radius: var(--radius-l);
}

.page-about .chrono__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 34px;
}

.page-about .chrono__rail {
  align-self: start;
}

.page-about .chrono__years {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .chrono__years a {
  display: block;
  white-space: nowrap;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--slate-lt);
  text-decoration: none;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .chrono__years a:hover,
.page-about .chrono__years a:focus-visible {
  border-color: var(--lime);
  color: var(--lime);
}

.page-about .chrono__stream {
  min-width: 0;
}

.page-about .chrono__node {
  position: relative;
  padding-left: clamp(22px, 3vw, 32px);
  padding-bottom: clamp(30px, 4.5vw, 52px);
  scroll-margin-top: calc(var(--masthead-h) + 24px);
}

.page-about .chrono__node::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--ice), rgba(169, 216, 230, 0.08));
}

.page-about .chrono__node::after {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(242, 169, 59, 0.16);
}

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

.page-about .chrono__node:last-child::before {
  bottom: auto;
  height: 34px;
}

.page-about .chrono__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--amber);
  margin-bottom: 6px;
}

.page-about .chrono__title {
  font-size: clamp(23px, 3vw, 32px);
  font-weight: 700;
  margin-bottom: 10px;
}

.page-about .chrono__node > p {
  color: var(--slate-lt);
  font-size: 15.5px;
  max-width: 58ch;
}

.page-about .media-frame {
  margin-top: 20px;
  border-radius: var(--radius-m);
  overflow: hidden;
}

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

.page-about .media-frame__caption {
  padding: 10px 4px 0;
  font-size: 12.5px;
  color: var(--slate);
}

/* ---------- 衬线引文 ---------- */
.page-about .quote {
  margin-top: var(--about-gap);
  padding: 0 var(--gutter);
}

.page-about .pullquote {
  margin: 0 auto;
  max-width: var(--shell);
  border-left: 4px solid var(--wine);
  padding-left: clamp(18px, 3vw, 30px);
}

.page-about .pullquote p {
  font-family: var(--font-serif);
  font-size: clamp(22px, 3.6vw, 30px);
  line-height: 1.6;
  color: var(--porcelain);
}

.page-about .quote__note {
  max-width: var(--shell);
  margin: 16px auto 0;
  padding-left: clamp(22px, 3.6vw, 34px);
  font-size: 14px;
  color: var(--slate);
}

/* ---------- 三条主张 ---------- */
.page-about .creed {
  margin-top: var(--about-gap);
  padding: 0 var(--gutter);
}

.page-about .creed__list {
  max-width: var(--shell);
  margin: 30px auto 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .creed__item {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .creed__summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: clamp(18px, 2.4vw, 26px) 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .creed__index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--slate);
  flex: none;
}

.page-about .creed__head {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 700;
  transition: color 200ms var(--ease);
}

.page-about .creed__mark {
  position: relative;
  flex: none;
  width: 20px;
  height: 20px;
}

.page-about .creed__mark::before,
.page-about .creed__mark::after {
  content: "";
  position: absolute;
  background: var(--slate);
  transition: transform 220ms var(--ease), background 220ms var(--ease);
}

.page-about .creed__mark::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  transform: translateY(-50%);
}

.page-about .creed__mark::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
}

.page-about .creed__item[open] .creed__mark::after {
  transform: translateX(-50%) scaleY(0);
}

.page-about .creed__item[open] .creed__mark::before {
  background: var(--lime);
}

.page-about .creed__item[open] .creed__head {
  color: var(--lime-mist);
}

.page-about .creed__body {
  padding: 0 0 26px;
  max-width: 62ch;
  color: var(--slate-lt);
  font-size: 15.5px;
}

.page-about .creed__body p {
  border-left: 2px solid var(--plateau);
  padding-left: 16px;
}

/* ---------- 数据链路 ---------- */
.page-about .pipe {
  margin-top: var(--about-gap);
  padding: 0 var(--gutter);
}

.page-about .pipe__grid {
  max-width: var(--shell);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .pipe__steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .pipe__steps li {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 15.5px;
  color: var(--slate-lt);
}

.page-about .pipe__steps strong {
  color: var(--porcelain);
  font-weight: 700;
}

.page-about .pipe__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--lime);
  padding-top: 4px;
}

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

.page-about .pipe__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-soft);
}

.page-about .pipe__media figcaption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--slate);
}

/* ---------- 地域 ---------- */
.page-about .region {
  position: relative;
  margin-top: var(--about-gap);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--chrome);
}

.page-about .region__media {
  position: absolute;
  inset: 0;
}

.page-about .region__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}

.page-about .region::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 26, 21, 0.4), rgba(6, 26, 21, 0.94));
  pointer-events: none;
}

.page-about .region__inner {
  position: relative;
  z-index: 1;
  padding: clamp(36px, 6.5vw, 84px) var(--gutter);
}

.page-about .region__lede {
  max-width: 62ch;
  margin-top: 16px;
  font-size: 15.5px;
  color: var(--slate-lt);
}

.page-about .region__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  max-width: 62ch;
}

.page-about .region__list li {
  padding-left: 16px;
  border-left: 1px solid var(--ice);
  font-size: 14.5px;
  color: var(--slate-lt);
}

/* ---------- 合作生态 ---------- */
.page-about .coop {
  margin-top: var(--about-gap);
  padding: 0 var(--gutter);
}

.page-about .coop__tags {
  max-width: var(--shell);
  margin: 26px auto 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .coop__tags .chip {
  border: 1px solid var(--line);
  color: var(--slate-lt);
  text-decoration: none;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .coop__tags .chip:hover,
.page-about .coop__tags .chip:focus-visible {
  border-color: var(--lime);
  color: var(--lime-mist);
}

.page-about .coop__notes {
  max-width: var(--shell);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .coop__note {
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  padding: clamp(20px, 3vw, 30px);
  scroll-margin-top: calc(var(--masthead-h) + 24px);
  transition: border-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .coop__note:target {
  border-color: var(--lime);
  box-shadow: inset 0 0 0 1px var(--lime);
}

.page-about .coop__note h3 {
  font-size: clamp(19px, 2.2vw, 23px);
  font-weight: 700;
  color: var(--lime-mist);
  margin-bottom: 10px;
}

.page-about .coop__note p {
  font-size: 15px;
  color: var(--slate-lt);
}

.page-about .coop__award {
  max-width: var(--shell);
  margin: 26px auto 0;
  padding-left: 16px;
  border-left: 3px solid var(--amber);
  font-family: var(--font-serif);
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.7;
  color: var(--porcelain);
}

/* ---------- 服务承诺 ---------- */
.page-about .service {
  margin-top: var(--about-gap);
  padding: 0 var(--gutter);
}

.page-about .service__panel {
  max-width: var(--shell);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 44px);
  padding: clamp(28px, 5vw, 60px);
  border-radius: var(--radius-l);
  border: 1px solid var(--line);
  background:
    repeating-linear-gradient(115deg, rgba(169, 216, 230, 0.05) 0 1px, transparent 1px 18px),
    linear-gradient(140deg, var(--plateau), var(--panel) 70%);
}

.page-about .service__lede {
  max-width: 52ch;
  margin: 16px 0 26px;
  font-size: 15.5px;
  color: var(--slate-lt);
}

.page-about .service__contact {
  display: grid;
  gap: 4px;
}

.page-about .service__row {
  padding: 12px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .service__label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-about .service__value {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: clamp(14px, 1.8vw, 17px);
  color: var(--lime-mist);
  word-break: break-word;
}

.page-about .service__value--text {
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--slate-lt);
}

@media (min-width: 720px) {
  .page-about .creed__body {
    padding-left: 46px;
  }
}

@media (min-width: 860px) {
  .page-about .service__panel {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .chrono__grid {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 44px;
    margin-top: 44px;
  }

  .page-about .chrono__rail {
    position: sticky;
    top: calc(var(--masthead-h) + 32px);
  }

  .page-about .chrono__years {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .chrono__years a {
    padding: 6px 12px;
  }

  .page-about .pipe__grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

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

  .page-about .coop__note:first-child {
    grid-row: span 2;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
}
<<<END>>>