.page-about {
  --about-rail-w: 236px;
  --about-line: rgba(43, 58, 110, 0.9);
  --about-panel: rgba(18, 31, 73, 0.55);
  --about-glow-v: rgba(123, 92, 255, 0.32);
  --about-glow-c: rgba(51, 225, 222, 0.28);
  position: relative;
  display: block;
  background: var(--ink-900);
  overflow-x: clip;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-offset) + 24px) 0 56px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 680px;
  background:
    radial-gradient(58% 58% at 74% 26%, var(--about-glow-v), transparent 68%),
    radial-gradient(52% 52% at 12% 8%, var(--about-glow-c), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about .about-hero-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 7.2vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-hero-title::after {
  content: "";
  display: block;
  width: 72px;
  height: 3px;
  margin-top: 18px;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
}

.page-about .about-hero-lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ink-800);
}

.page-about .about-metric-num {
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-metric-label {
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero-visual {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 46%, rgba(5, 9, 26, 0.88) 100%);
  pointer-events: none;
}

.page-about .about-hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
}

.page-about .about-hero-caption {
  position: absolute;
  left: 18px;
  bottom: 14px;
  z-index: 2;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

/* ============ 主体两栏 ============ */
.page-about .about-body {
  padding: 8px 0 72px;
}

.page-about .about-body-grid {
  display: grid;
  gap: 40px;
}

.page-about .about-rail-title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-rail .toc-list {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail .toc-list::-webkit-scrollbar {
  display: none;
}

.page-about .toc-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  font-size: 14px;
  white-space: nowrap;
  text-decoration: none;
  color: var(--muted);
  border-radius: var(--pill);
  border: 1px solid transparent;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .toc-link::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--line);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .toc-link:hover,
.page-about .toc-link:focus-visible {
  color: var(--white);
  border-color: var(--line);
}

.page-about .toc-link:hover::before,
.page-about .toc-link:focus-visible::before {
  background: var(--violet);
}

.page-about .toc-link[aria-current="true"] {
  color: var(--white);
  background: rgba(123, 92, 255, 0.16);
  border-color: rgba(123, 92, 255, 0.42);
}

.page-about .toc-link[aria-current="true"]::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(51, 225, 222, 0.16), 0 0 12px rgba(51, 225, 222, 0.85);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(52px, 7vw, 92px);
}

.page-about .about-section {
  position: relative;
  scroll-margin-top: calc(var(--header-offset) + 24px);
  padding-top: 4px;
}

.page-about .about-section + .about-section::before {
  content: "";
  position: absolute;
  top: calc(-1 * clamp(26px, 3.5vw, 46px));
  left: 0;
  width: min(320px, 62%);
  height: 1px;
  background: linear-gradient(90deg, var(--about-glow-v), var(--about-glow-c), transparent);
  transform: skewY(-0.9deg);
}

.page-about .about-section .section-title {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-copy {
  margin-top: 20px;
  max-width: 72ch;
}

.page-about .about-copy p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-copy p:last-child {
  margin-bottom: 0;
}

/* ============ 起点 callout ============ */
.page-about .about-callout {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 24px;
  padding: 16px 18px;
  background: var(--about-panel);
  border: 1px solid var(--line);
  border-left: 2px solid var(--violet);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .about-callout-note {
  font-size: 13px;
  color: var(--muted);
}

/* ============ 内容工序 ============ */
.page-about .about-flow-figure {
  margin: 24px 0 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--cut));
  overflow: hidden;
}

.page-about .about-flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

.page-about .about-grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 26px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-mini {
  padding: 20px 18px;
  background: var(--ink-800);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-mini:hover {
  background: var(--ink-700);
  box-shadow: inset 0 0 0 1px rgba(51, 225, 222, 0.42);
}

.page-about .about-mini-title {
  margin: 0 0 8px;
  font-size: 22px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-mini-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ============ 版本时间线 ============ */
.page-about .ver-track {
  position: relative;
  margin: 26px 0 0;
  padding: 0 0 0 46px;
  list-style: none;
}

.page-about .ver-track::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--violet) 52%, rgba(43, 58, 110, 0.15));
}

.page-about .ver-node {
  position: relative;
  padding: 0 0 26px;
  outline: none;
}

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

.page-about .ver-dot {
  position: absolute;
  left: -35px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  box-shadow: inset 0 0 0 2px var(--line);
  transition: box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .ver-node:hover .ver-dot,
.page-about .ver-node:focus-visible .ver-dot,
.page-about .ver-node:focus-within .ver-dot {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(51, 225, 222, 0.16), 0 0 14px rgba(51, 225, 222, 0.8);
}

.page-about .ver-index {
  display: block;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--violet);
}

.page-about .ver-title {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 3.6vw, 23px);
  font-weight: 700;
  color: var(--white);
}

.page-about .ver-summary {
  margin: 8px 0 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .ver-detail {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 300ms var(--ease);
}

.page-about .ver-detail > div {
  overflow: hidden;
}

.page-about .ver-detail p {
  margin: 0;
  padding-top: 10px;
  max-width: 66ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .ver-node:hover .ver-detail,
.page-about .ver-node:focus-visible .ver-detail,
.page-about .ver-node:focus-within .ver-detail {
  grid-template-rows: 1fr;
}

/* ============ 团队 ============ */
.page-about .about-team-layout {
  display: grid;
  gap: 24px;
  margin-top: 24px;
}

.page-about .about-team-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  overflow: hidden;
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .about-team-index {
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .team-row {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 16px 18px;
  background: var(--ink-800);
  transition: background var(--dur) var(--ease);
}

.page-about .team-row:hover {
  background: var(--ink-700);
}

.page-about .team-num {
  font-size: 26px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .team-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .team-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
}

.page-about .team-desc {
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

/* ============ 服务对象 ============ */
.page-about .audience-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 24px;
}

.page-about .audience-card {
  position: relative;
  padding: 22px 20px;
  background: var(--about-panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .audience-card:hover {
  border-color: rgba(123, 92, 255, 0.6);
  box-shadow: 0 0 0 1px rgba(123, 92, 255, 0.28), 0 14px 40px -24px rgba(123, 92, 255, 0.9);
  transform: translateY(-3px);
}

.page-about .audience-title {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}

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

/* ============ 合作矩阵 ============ */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 20px;
}

.page-about .partner-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 18px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .partner-card:hover {
  border-color: rgba(51, 225, 222, 0.52);
  box-shadow: 0 0 0 1px rgba(51, 225, 222, 0.22), 0 16px 42px -28px rgba(51, 225, 222, 0.9);
  transform: translateY(-3px);
}

.page-about .partner-mark {
  width: 34px;
  height: 34px;
  background:
    linear-gradient(135deg, rgba(123, 92, 255, 0.85), rgba(51, 225, 222, 0.7));
  clip-path: polygon(0 0, 100% 0, 100% 62%, 62% 100%, 0 100%);
}

.page-about .partner-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about .partner-desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .partner-card .tag {
  align-self: flex-start;
  margin-top: 2px;
}

/* ============ 了解更多 ============ */
.page-about .about-section--final .more-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 24px;
}

.page-about .more-card {
  position: relative;
  display: block;
  padding: 22px 20px 26px;
  text-decoration: none;
  background: var(--ink-800);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .more-card:hover,
.page-about .more-card:focus-visible {
  border-color: rgba(123, 92, 255, 0.62);
  background: var(--ink-700);
  transform: translateY(-3px);
}

.page-about .more-index {
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--violet);
}

.page-about .more-title {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--white);
}

.page-about .more-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .more-arrow {
  position: absolute;
  right: 20px;
  bottom: 18px;
  font-size: 18px;
  color: var(--cyan);
  transition: transform var(--dur) var(--ease);
}

.page-about .more-card:hover .more-arrow,
.page-about .more-card:focus-visible .more-arrow {
  transform: translateX(5px);
}

.page-about .about-final-cta {
  margin-top: 26px;
}

/* ============ 返回顶部 ============ */
.page-about .to-top {
  position: fixed;
  right: 18px;
  bottom: 22px;
  z-index: 40;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--white);
  background: rgba(18, 31, 73, 0.92);
  border: 1px solid rgba(123, 92, 255, 0.6);
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) var(--ease);
}

.page-about .to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-about .to-top:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ============ 平板与桌面 ============ */
@media (min-width: 640px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: calc(var(--header-offset) + 40px) 0 72px;
  }

  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: clamp(32px, 5vw, 76px);
  }

  .page-about .about-team-layout {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 24px;
    align-items: stretch;
  }

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

@media (min-width: 1000px) {
  .page-about .about-body-grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 84px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-offset) + 20px);
  }

  .page-about .about-rail .toc-list {
    flex-direction: column;
    gap: 2px;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-about .toc-link {
    width: 100%;
    border-radius: 10px;
  }
}

@media (min-width: 1280px) {
  .page-about .audience-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .more-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-mini,
  .page-about .audience-card,
  .page-about .partner-card,
  .page-about .more-card,
  .page-about .more-arrow,
  .page-about .to-top,
  .page-about .ver-detail,
  .page-about .ver-dot,
  .page-about .toc-link {
    transition: none;
  }

  .page-about .audience-card:hover,
  .page-about .partner-card:hover,
  .page-about .more-card:hover,
  .page-about .more-card:focus-visible {
    transform: none;
  }

  .page-about .more-card:hover .more-arrow,
  .page-about .more-card:focus-visible .more-arrow {
    transform: none;
  }
}
<<<END>>>