.page-about {
  --about-gap: clamp(20px, 4vw, 44px);
  --about-sec: clamp(40px, 7vw, 76px);
  background: var(--ink);
  color: var(--ice);
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow-wrap: break-word;
}

.page-about .about-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.page-about .about-kicker::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line-soft);
}
.page-about .about-kicker--cinnabar { color: #E8685C; }
.page-about .about-kicker--cinnabar::after { background: rgba(201, 58, 46, .45); }

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--header-h) + 52px) 0 clamp(40px, 7vw, 64px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(0, 229, 242, .12), transparent 62%),
    radial-gradient(80% 70% at 6% 100%, rgba(255, 45, 170, .10), transparent 66%),
    linear-gradient(180deg, var(--deck) 0%, var(--ink) 82%);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    repeating-linear-gradient(90deg, rgba(42, 64, 80, .28) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(42, 64, 80, .22) 0 1px, transparent 1px 72px);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 88%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 88%);
  pointer-events: none;
}
.page-about .about-hero__inner { position: relative; z-index: 1; }

.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--mist);
  margin-bottom: 22px;
}
.page-about .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  transition: color .16s var(--ease);
}
.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible { color: var(--cyan); }
.page-about .breadcrumbs__sep { color: var(--line); }

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 8.4vw, 68px);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--ice);
  text-wrap: balance;
}
.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 2.2vw, 17px);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(28px, 5vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.page-about .hero-stat {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: rgba(13, 20, 29, .74);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: border-color .18s var(--ease), background .18s var(--ease);
}
.page-about .hero-stat:hover {
  border-color: var(--cyan-30);
  background: var(--cyan-12);
}
.page-about .hero-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 4.4vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
}
.page-about .hero-stat__unit {
  font-size: .55em;
  margin-left: 2px;
  color: var(--ice);
}
.page-about .hero-stat__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-seal {
  position: absolute;
  top: calc(var(--header-h) + 40px);
  right: clamp(16px, 5vw, 56px);
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: var(--cinnabar);
  color: var(--ice);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 26px;
  transform: rotate(-7deg);
  box-shadow: 0 10px 28px rgba(201, 58, 46, .3);
  z-index: 2;
}

/* ---------- 主体栅格 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 26px;
  padding-top: clamp(32px, 6vw, 60px);
}
.page-about .about-body { min-width: 0; }

/* ---------- 侧栏索引 ---------- */
.page-about .about-toc__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--mist);
  margin: 0 0 10px;
}
.page-about .about-toc__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}
.page-about .about-toc__link {
  flex: 0 0 auto;
  padding: 9px 15px;
  border-radius: var(--pill);
  border: 1px solid var(--line-soft);
  background: rgba(22, 34, 47, .5);
  color: var(--mist);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  font-family: var(--font-mono);
  transition: color .16s var(--ease), border-color .16s var(--ease), background .16s var(--ease);
}
.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--ice);
  border-color: var(--cyan-30);
}
.page-about .about-toc__link[aria-current="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  margin-bottom: var(--about-sec);
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.page-about .about-h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 4vw, 32px);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--ice);
}
.page-about .about-h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--ice);
}
.page-about .about-section__lead {
  margin: 0 0 22px;
  max-width: 62ch;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.78;
}
.page-about .about-section p { line-height: 1.78; }

/* ---------- 起点 ---------- */
.page-about .about-origin {
  display: grid;
  gap: 22px;
}
.page-about .about-origin__text p {
  margin: 0 0 14px;
  color: var(--mist);
  font-size: 15px;
}
.page-about .about-origin__text p:first-child { color: var(--ice); }
.page-about .about-origin__text p:last-child {
  margin-bottom: 0;
  color: var(--ice);
  border-left: 2px solid var(--cyan);
  padding-left: 14px;
}
.page-about .about-origin__figure { margin: 0; }
.page-about .about-origin__figure figcaption,
.page-about .about-lines__figure figcaption,
.page-about .about-timeline__figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 业务主线 ---------- */
.page-about .about-lines {
  display: grid;
  gap: 14px;
}
.page-about .about-line {
  position: relative;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  padding: 20px;
  background: linear-gradient(160deg, rgba(22, 34, 47, .88), rgba(13, 20, 29, .92));
  transition: border-color .18s var(--ease), box-shadow .18s var(--ease);
}
.page-about .about-line:hover {
  border-color: var(--cyan-30);
  box-shadow: inset 3px 0 0 var(--cyan);
}
.page-about .about-line--wide {
  background:
    linear-gradient(120deg, rgba(0, 229, 242, .10), transparent 55%),
    linear-gradient(160deg, rgba(22, 34, 47, .9), rgba(13, 20, 29, .95));
}
.page-about .about-line__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
  margin-bottom: 10px;
}
.page-about .about-line__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  color: var(--ice);
}
.page-about .about-line__text {
  margin: 0 0 14px;
  font-size: 14.5px;
  color: var(--mist);
}
.page-about .about-line__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-30);
  padding-bottom: 3px;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}
.page-about .about-line__link::after { content: "→"; color: var(--cyan); }
.page-about .about-line__link:hover,
.page-about .about-line__link:focus-visible { color: var(--cyan); border-color: var(--cyan); }

.page-about .about-lines__figure {
  margin: 18px 0 0;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--magenta) 62%, var(--line));
  opacity: .55;
}
.page-about .about-node {
  position: relative;
  padding: 0 0 26px 30px;
}
.page-about .about-node:last-child { padding-bottom: 0; }
.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 242, .12);
}
.page-about .about-node__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--ink);
  background: var(--cyan);
  border-radius: var(--pill);
  padding: 3px 12px;
  margin-bottom: 10px;
}
.page-about .about-node__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  color: var(--ice);
}
.page-about .about-node__text {
  margin: 0 0 8px;
  font-size: 14.5px;
  color: var(--mist);
}
.page-about .about-node__link {
  font-size: 13px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px dashed var(--cyan-30);
  padding-bottom: 2px;
}
.page-about .about-node__link:hover,
.page-about .about-node__link:focus-visible { border-bottom-style: solid; }
.page-about .about-timeline__figure { margin: 24px 0 0; }

/* ---------- 团队与协作 ---------- */
.page-about .about-team-grid {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.page-about .about-stat {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: rgba(22, 34, 47, .55);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  transition: border-color .18s var(--ease), background .18s var(--ease), transform .18s var(--ease);
}
.page-about .about-stat:hover {
  border-color: var(--cyan-30);
  background: var(--cyan-12);
  transform: translateY(-2px);
}
.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--ice);
}
.page-about .about-stat__unit { font-size: .6em; color: var(--magenta); }
.page-about .about-stat__label {
  font-size: 13px;
  font-weight: 700;
  color: var(--ice);
}
.page-about .about-stat__note {
  font-size: 12px;
  line-height: 1.55;
  color: var(--mist);
}

.page-about .about-team-split {
  display: grid;
  gap: 22px;
  border-top: 1px solid var(--line-soft);
  padding-top: 22px;
}
.page-about .about-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .about-rules li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}
.page-about .about-rules li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--magenta);
}
.page-about .about-rules strong { color: var(--ice); font-weight: 700; }

.page-about .about-team-split__map {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: radial-gradient(80% 80% at 50% 40%, rgba(0, 229, 242, .10), rgba(13, 20, 29, .9) 70%);
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.page-about .about-map { width: 100%; max-width: 380px; height: auto; }
.page-about .about-map__line line {
  stroke: var(--line);
  stroke-width: 1;
  opacity: .9;
}
.page-about .about-map__dot circle { fill: var(--cyan); opacity: .85; }
.page-about .about-map__ring circle {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 1;
  opacity: .3;
}
.page-about .about-map__caption {
  margin: 0;
  font-size: 12px;
  color: var(--mist);
  text-align: center;
}

/* ---------- 选择理由 ---------- */
.page-about .about-why {
  display: grid;
  gap: 12px;
}
.page-about .about-why__item {
  border-left: 2px solid var(--line);
  padding: 4px 0 4px 16px;
  transition: border-color .18s var(--ease);
}
.page-about .about-why__item:hover { border-color: var(--cyan); }
.page-about .about-why__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16.5px;
  color: var(--ice);
}
.page-about .about-why__text {
  margin: 0;
  font-size: 14.5px;
  color: var(--mist);
}
.page-about .about-why__foot {
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  background: rgba(240, 184, 75, .08);
  border: 1px solid rgba(240, 184, 75, .3);
  border-radius: var(--radius-md);
  padding: 14px 16px;
}

/* ---------- 开放合作 ---------- */
.page-about .about-partner {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(201, 58, 46, .38);
  border-radius: var(--radius-xl);
  padding: clamp(22px, 4vw, 38px);
  background:
    linear-gradient(135deg, rgba(201, 58, 46, .18), transparent 58%),
    var(--deck);
  margin-bottom: var(--about-sec);
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.page-about .about-partner::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -60px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 45, 170, .18), transparent 70%);
  pointer-events: none;
}
.page-about .about-partner__text {
  margin: 0 0 20px;
  max-width: 64ch;
  font-size: 15px;
  color: var(--mist);
}
.page-about .about-partner__list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 12px;
  font-size: 14px;
  color: var(--mist);
  line-height: 1.7;
}
.page-about .about-partner__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--ice);
  background: rgba(201, 58, 46, .85);
  border-radius: var(--pill);
  padding: 3px 10px;
  margin-right: 8px;
  vertical-align: 1px;
}
.page-about .about-partner__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}
.page-about .about-partner__mail {
  margin: 0;
  font-size: 12.5px;
  color: var(--mist);
  line-height: 1.6;
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--line-soft);
  padding-top: 28px;
}
.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 4vw, 30px);
  color: var(--ice);
}
.page-about .about-cta__text {
  margin: 0 0 20px;
  max-width: 56ch;
  font-size: 15px;
  color: var(--mist);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .about-origin { grid-template-columns: minmax(0, 1fr) minmax(0, .82fr); align-items: start; }
  .page-about .about-lines { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .about-line--wide { grid-column: 1 / -1; }
  .page-about .about-team-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .about-team-split { grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr); align-items: start; }
  .page-about .about-why { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 22px; }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 60px);
    align-items: start;
  }
  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
  .page-about .about-toc__nav {
    flex-direction: column;
    overflow: visible;
    gap: 6px;
    padding-bottom: 0;
  }
  .page-about .about-toc__link {
    border-radius: var(--radius-sm);
    border-color: transparent;
    background: transparent;
    padding: 8px 12px;
    border-left: 2px solid var(--line-soft);
  }
  .page-about .about-toc__link[aria-current="true"] {
    color: var(--cyan);
    background: var(--cyan-12);
    border-color: var(--cyan);
  }
  .page-about .about-hero h1 { font-size: clamp(52px, 5.6vw, 72px); }
}

@media (min-width: 1240px) {
  .page-about .about-seal { width: 68px; height: 68px; font-size: 30px; }
}

@media (max-width: 480px) {
  .page-about .about-seal { width: 46px; height: 46px; font-size: 21px; border-radius: 12px; }
  .page-about .about-partner__tag { margin-bottom: 4px; }
  .page-about .about-cta__actions .btn,
  .page-about .about-partner__actions .btn { width: 100%; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stat:hover { transform: none; }
  .page-about .about-line,
  .page-about .about-stat,
  .page-about .about-toc__link { transition: none; }
}
<<<PAGE_CSS_END>>>