.page-about {
  background-color: var(--sea-800);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about .container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- 面包屑 ---------- */
.page-about .about-topline {
  border-bottom: 1px solid var(--line-soft);
  background-color: var(--sea-900);
}

.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-block: 14px;
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

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

.page-about .breadcrumbs__sep {
  color: var(--sea-600);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(30px, 5vw, 68px) clamp(26px, 4vw, 52px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 96% at 10% -10%, rgba(47, 214, 232, .16), transparent 58%),
    radial-gradient(90% 88% at 92% 6%, rgba(255, 122, 26, .14), transparent 56%),
    linear-gradient(180deg, var(--sea-900), var(--sea-800));
}

.page-about .about-hero__shell {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .about-hero .eyebrow {
  color: var(--cyan);
  letter-spacing: .16em;
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6.4vw, 4.6rem);
  line-height: 1.04;
  letter-spacing: -.01em;
  color: var(--white);
  max-width: 22ch;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 68ch;
  font-size: clamp(.95rem, 1.6vw, 1.06rem);
  line-height: 1.85;
  color: var(--paper);
  opacity: .92;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line-soft);
  background-color: var(--line-soft);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 14px;
  background-color: var(--sea-700);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.6vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
  letter-spacing: -.02em;
}

.page-about .about-hero__facts li:nth-child(2) .about-fact__num {
  color: var(--lime);
}

.page-about .about-hero__facts li:nth-child(3) .about-fact__num {
  color: var(--cyan);
}

.page-about .about-hero__facts li:nth-child(4) .about-fact__num {
  color: var(--white);
}

.page-about .about-fact__unit {
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--mist);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-columns {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  padding-block: clamp(26px, 4vw, 56px) clamp(40px, 6vw, 88px);
}

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

.page-about .section-index {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .section-index__link {
  flex: 0 0 auto;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-size: .78rem;
  letter-spacing: .05em;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.page-about .section-index__link:hover,
.page-about .section-index__link:focus-visible {
  color: var(--paper);
  border-color: var(--line-hard);
}

.page-about .section-index__link[aria-current="true"] {
  color: var(--sea-950);
  background-color: var(--signal);
  border-color: var(--signal);
  font-weight: 700;
}

.page-about .about-body {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(44px, 6vw, 88px);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
  scroll-margin-top: 120px;
}

.page-about .about-section .eyebrow {
  color: var(--cyan);
  letter-spacing: .16em;
}

.page-about .about-section h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  line-height: 1.2;
  letter-spacing: -.005em;
  color: var(--white);
  max-width: 30ch;
}

.page-about .about-section h3 {
  margin: 0;
  font-size: clamp(1rem, 1.9vw, 1.14rem);
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-section__lede {
  margin: 0;
  max-width: 62ch;
  font-size: .96rem;
  line-height: 1.85;
  color: var(--paper);
  opacity: .9;
}

.page-about .about-section p {
  font-size: .94rem;
  line-height: 1.85;
  color: var(--paper);
  opacity: .9;
  max-width: 62ch;
  margin: 0;
}

.page-about .about-section a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 214, 232, .4);
  transition: color .18s ease, border-color .18s ease;
}

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

.page-about .about-note {
  margin: 4px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--signal);
  font-size: .84rem;
  line-height: 1.8;
  color: var(--mist);
  max-width: 56ch;
}

.page-about .about-note--wide {
  max-width: 72ch;
  padding-left: 16px;
}

/* ---------- 覆盖版图 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 6px;
}

.page-about .about-map {
  margin: 0;
  padding: 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background:
    linear-gradient(160deg, rgba(20, 43, 71, .9), rgba(6, 18, 31, .9));
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

.page-about .about-map__node circle {
  fill: var(--signal);
  stroke: rgba(255, 122, 26, .3);
  stroke-width: 6;
}

.page-about .about-map__node:nth-child(2n) circle {
  fill: var(--cyan);
  stroke: rgba(47, 214, 232, .26);
}

.page-about .about-map__node text {
  fill: var(--paper);
  font-size: 13px;
  font-family: var(--font-body);
  letter-spacing: .04em;
}

.page-about .about-map__caption {
  font-size: .74rem;
  line-height: 1.7;
  color: var(--mist);
  letter-spacing: .03em;
}

.page-about .about-coverage__side {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 20px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background-color: var(--sea-700);
}

.page-about .about-tier {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tier li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-block: 12px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-tier li:last-child {
  border-bottom: none;
}

.page-about .about-tier__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
  min-width: 3.4ch;
}

.page-about .about-tier li:nth-child(2) .about-tier__num {
  color: var(--amber);
}

.page-about .about-tier li:nth-child(3) .about-tier__num {
  color: var(--lime);
}

.page-about .about-tier__label {
  font-size: .84rem;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 记录来源 ---------- */
.page-about .about-sources {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 6px;
}

.page-about .source-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan);
  border-radius: var(--radius-sm);
  background-color: var(--sea-700);
  transition: border-color .2s ease, transform .2s ease;
}

.page-about .source-card:nth-child(2) {
  border-top-color: var(--signal);
}

.page-about .source-card:nth-child(3) {
  border-top-color: var(--lime);
}

.page-about .source-card:hover {
  border-color: var(--line-hard);
  transform: translateY(-2px);
}

.page-about .source-card .tag {
  align-self: flex-start;
}

.page-about .source-card__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1px solid var(--line-soft);
  padding-top: 12px;
}

.page-about .source-card__list li {
  position: relative;
  padding-left: 16px;
  font-size: .83rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .source-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background-color: var(--signal);
}

/* ---------- 记录流程 ---------- */
.page-about .about-flow-figure {
  margin: 4px 0 0;
}

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

.page-about .about-flow-figure figcaption,
.page-about .about-maps__figure figcaption,
.page-about .about-network-figure figcaption {
  margin-top: 10px;
  font-size: .74rem;
  line-height: 1.7;
  color: var(--mist);
  letter-spacing: .03em;
}

.page-about .flow {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 8px 0 0;
  padding: 0 0 0 22px;
  list-style: none;
}

.page-about .flow::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--signal), var(--cyan) 55%, var(--lime));
  opacity: .55;
}

.page-about .flow__step {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-block: 18px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .flow__step:last-child {
  border-bottom: none;
}

.page-about .flow__step::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--sea-800);
  border: 2px solid var(--signal);
}

.page-about .flow__step:nth-child(2)::before {
  border-color: var(--cyan);
}

.page-about .flow__step:nth-child(3)::before {
  border-color: var(--lime);
}

.page-about .flow__marker {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .flow__index {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  color: var(--sea-950);
  background-color: var(--signal);
  padding: 3px 9px;
  border-radius: var(--radius-pill);
  font-weight: 700;
}

.page-about .flow__step:nth-child(2) .flow__index {
  background-color: var(--cyan);
}

.page-about .flow__step:nth-child(3) .flow__index {
  background-color: var(--lime);
}

.page-about .flow__when {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--white);
}

.page-about .flow__body {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

.page-about .flow__fields li {
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-size: .74rem;
  letter-spacing: .03em;
  color: var(--mist);
  background-color: rgba(20, 43, 71, .6);
}

/* ---------- 复核与版本 ---------- */
.page-about .about-review {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 6px;
}

.page-about .review-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background-color: var(--sea-700);
}

.page-about .review-panel--version {
  background:
    linear-gradient(150deg, rgba(255, 122, 26, .1), rgba(6, 18, 31, .95) 62%);
  border-color: rgba(255, 122, 26, .34);
}

.page-about .review-panel .tag {
  align-self: flex-start;
}

.page-about .review-states {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
  padding-top: 14px;
}

.page-about .review-states li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-about .status-pill {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  padding: 4px 11px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  white-space: nowrap;
}

.page-about .status-pill--ok {
  color: var(--sea-950);
  background-color: var(--lime);
  border-color: var(--lime);
  font-weight: 700;
}

.page-about .status-pill--pending {
  color: var(--mist);
  background-color: rgba(143, 163, 184, .12);
  border-color: rgba(143, 163, 184, .38);
}

.page-about .review-states__text {
  font-size: .82rem;
  line-height: 1.6;
  color: var(--paper);
  opacity: .85;
}

.page-about .review-panel__foot {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: .84rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 主场地图 ---------- */
.page-about .about-maps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: 6px;
}

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

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

.page-about .about-maps__copy {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-dimensions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 4px 0 0;
  background-color: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-xs);
  overflow: hidden;
}

.page-about .about-dimensions > div {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 13px 14px;
  background-color: var(--sea-700);
}

.page-about .about-dimensions dt {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-dimensions dd {
  margin: 0;
  font-size: .82rem;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 区域记录网络 ---------- */
.page-about .about-network-figure {
  margin: 4px 0 0;
}

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

.page-about .about-network {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 4px;
}

.page-about .network-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--signal);
  border-radius: var(--radius-sm);
  background-color: var(--sea-700);
}

.page-about .network-stat--lime {
  border-left-color: var(--lime);
}

.page-about .network-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 7vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--signal);
}

.page-about .network-stat--lime .network-stat__num {
  color: var(--lime);
}

.page-about .network-stat__unit {
  font-size: .8rem;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .network-stat p {
  margin: 6px 0 0;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--paper);
  opacity: .84;
}

.page-about .about-network__copy {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ---------- 合作与认可 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 6px;
}

.page-about .partners-lead {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background:
    radial-gradient(120% 100% at 0% 0%, rgba(255, 122, 26, .14), transparent 60%),
    var(--sea-700);
}

.page-about .partners-lead .figure-xl {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .partners-lead .num {
  font-family: var(--font-mono);
  font-size: clamp(3.4rem, 11vw, 5.4rem);
  font-weight: 700;
  line-height: .9;
  letter-spacing: -.04em;
  color: var(--signal);
}

.page-about .partners-lead__unit {
  font-size: .82rem;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .partners-side {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background-color: var(--sea-700);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: clamp(24px, 4vw, 38px) clamp(20px, 3.4vw, 34px);
  border: 1px solid rgba(47, 214, 232, .3);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(110% 130% at 100% 0%, rgba(47, 214, 232, .16), transparent 58%),
    linear-gradient(160deg, var(--sea-700), var(--sea-900));
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 3.4vw, 2rem);
  font-weight: 800;
  line-height: 1.24;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 62ch;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--paper);
  opacity: .88;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.page-about .about-cta__top {
  margin-left: auto;
}

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

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

  .page-about .about-coverage__side {
    padding: 24px 22px;
  }

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

@media (min-width: 880px) {
  .page-about .about-sources {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
    gap: 28px;
  }

  .page-about .about-maps {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
    gap: 26px;
  }

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

  .page-about .about-partners {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
    gap: 20px;
    align-items: start;
  }

  .page-about .about-review {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    gap: 16px;
  }

  .page-about .flow__step {
    display: grid;
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
    padding-block: 22px;
  }

  .page-about .flow__marker {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .page-about .flow__step::before {
    top: 28px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-columns {
    grid-template-columns: var(--rail) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 128px;
  }

  .page-about .section-index {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    border-left: 2px solid var(--line-soft);
    padding-bottom: 0;
  }

  .page-about .section-index__link {
    border: none;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -2px;
    padding: 9px 0 9px 14px;
    font-size: .8rem;
    background: none;
    white-space: normal;
  }

  .page-about .section-index__link:hover,
  .page-about .section-index__link:focus-visible {
    color: var(--paper);
    border-left-color: var(--mist);
    border-radius: 0;
    background: none;
  }

  .page-about .section-index__link[aria-current="true"] {
    color: var(--signal);
    background: none;
    border-left-color: var(--signal);
    font-weight: 700;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .source-card {
    transition: none;
  }

  .page-about .source-card:hover {
    transform: none;
  }
}
<<<END>>>