.page-about {
  --about-rail: 210px;
  --about-gap: clamp(20px, 3vw, 40px);
  --about-radius: 0;
  background: var(--ink);
  color: var(--fog);
  padding-bottom: clamp(32px, 5vw, 64px);
}

/* 面包屑 */
.page-about .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 32px);
}
.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}
.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.page-about .breadcrumb-link {
  color: var(--mute);
  text-decoration: none;
}
.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--neon);
}
.page-about .breadcrumb-current {
  color: var(--fog);
}

/* 首屏 */
.page-about .about-hero {
  padding: clamp(20px, 4vw, 48px) 0 clamp(32px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 100% at 84% -10%, var(--neon-08), transparent 60%),
    radial-gradient(90% 70% at 0% 110%, var(--track-10), transparent 65%),
    var(--ink);
}
.page-about .about-hero-grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}
.page-about .about-h1-brand {
  display: block;
  margin-bottom: 0.5em;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.34em;
  color: var(--neon);
  text-transform: uppercase;
}
.page-about h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 60px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--fog);
  max-width: 15em;
}
.page-about .about-lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 36em;
  font-size: clamp(15px, 1.9vw, 18px);
  line-height: 1.85;
  color: var(--mute);
}

/* KPI */
.page-about .about-kpis {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: clamp(14px, 2.4vw, 24px);
  margin-top: clamp(24px, 3.4vw, 36px);
  padding-top: clamp(18px, 2.6vw, 26px);
  border-top: 1px solid var(--line);
}
.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1;
  color: var(--neon);
}
.page-about .stat-label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--mute);
}

/* 首屏章节预览 */
.page-about .about-preview {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: clamp(18px, 2.6vw, 26px);
}
.page-about .about-preview-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--dim);
  text-transform: uppercase;
}
.page-about .about-preview-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-preview-list a {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  color: var(--fog);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  transition: color var(--dur) var(--ease);
}
.page-about .about-preview-list li:last-child a {
  border-bottom: 0;
}
.page-about .about-preview-list .idx {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--neon);
  letter-spacing: 0.06em;
}
.page-about .about-preview-list a:hover .lbl,
.page-about .about-preview-list a:focus-visible .lbl {
  color: var(--neon);
}
.page-about .about-preview-note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--track);
}

/* 布局 */
.page-about .about-layout {
  display: grid;
  gap: clamp(20px, 3vw, 44px);
  padding-top: clamp(30px, 5vw, 62px);
}
.page-about .about-index {
  display: none;
}
.page-about .about-index-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--dim);
}
.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 14px;
  border-left: 1px solid var(--line);
}
.page-about .about-index-list a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 8px 0;
  font-size: 13px;
  color: var(--mute);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.page-about .about-index-list .idx {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--dim);
}
.page-about .about-index-list a:hover,
.page-about .about-index-list a:focus-visible {
  color: var(--neon);
}
.page-about .about-index-mark {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--track);
}

/* 章节 */
.page-about .about-chapter {
  scroll-margin-top: calc(var(--header-h) + 24px);
  padding: clamp(26px, 4vw, 46px) 0;
  border-top: 1px solid var(--line);
}
.page-about .about-body > .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-chapter-head {
  position: relative;
  margin-bottom: clamp(18px, 2.8vw, 30px);
}
.page-about .about-chapter-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.6vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--fog);
  max-width: 18em;
}
.page-about .about-vert {
  display: none;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--dim);
}

/* 分栏 */
.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}
.page-about .about-text p {
  margin: 0 0 1.1em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mute);
  max-width: 46em;
}
.page-about .about-text p:last-child {
  margin-bottom: 0;
}
.page-about .about-lead-text {
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-size: 15px;
  line-height: 1.9;
  color: var(--mute);
  max-width: 46em;
}

/* 图片 */
.page-about .about-figure {
  margin: 0;
  position: relative;
}
.page-about .about-figure .figure-media {
  position: relative;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}
.page-about .about-figure .figure-media::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--neon-08) 1px, transparent 1px),
    linear-gradient(to bottom, var(--neon-08) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.6;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-figure .figure-tag {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 3;
  display: inline-block;
  padding: 6px 10px;
  background: var(--neon);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
}
.page-about .about-figure .figure-caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--dim);
}

/* 折叠面板 */
.page-about .about-details-group {
  margin-top: clamp(22px, 3.4vw, 34px);
  display: grid;
  gap: 10px;
}
.page-about .about-details {
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color var(--dur) var(--ease);
}
.page-about .about-details[open] {
  border-color: var(--neon-32);
  background: var(--raise);
}
.page-about .about-details summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--fog);
}
.page-about .about-details summary::-webkit-details-marker {
  display: none;
}
.page-about .about-details summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--neon);
}
.page-about .about-details[open] summary::after {
  content: "−";
}
.page-about .about-details summary:hover {
  color: var(--neon);
}
.page-about .about-details summary:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: -2px;
}
.page-about .about-details-body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--line);
}
.page-about .about-details-body p {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mute);
}
.page-about .about-list {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}
.page-about .about-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--fog);
}
.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  background: var(--neon);
}

/* 服务半径点阵 */
.page-about .radius-wrap {
  position: relative;
  margin-top: clamp(18px, 2.6vw, 26px);
  padding: clamp(14px, 2vw, 20px);
  border: 1px solid var(--line);
  background: var(--panel);
  outline: none;
}
.page-about .radius-wrap:focus-visible {
  border-color: var(--neon-32);
}
.page-about .radius-dots {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 6px;
}
.page-about .radius-dot {
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--dim);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .radius-dot--key {
  border-color: var(--neon-32);
  background: var(--neon-08);
  color: var(--neon);
}
.page-about .radius-wrap:hover .radius-dot--key {
  transform: scale(1.06);
  border-color: var(--neon);
}
.page-about .radius-badge {
  position: absolute;
  right: clamp(14px, 2vw, 20px);
  top: -12px;
  margin: 0;
  padding: 5px 10px;
  background: var(--neon);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  pointer-events: none;
}
.page-about .radius-wrap:hover .radius-badge,
.page-about .radius-wrap:focus-within .radius-badge,
.page-about .radius-wrap:focus .radius-badge {
  opacity: 1;
  transform: translateY(0);
}
.page-about .about-fineprint {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--dim);
}

/* 团队卡 */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
}
.page-about .about-team-card {
  padding: clamp(16px, 2.2vw, 22px);
  border: 1px solid var(--line);
  background: var(--panel);
}
.page-about .about-team-card--accent {
  border-color: var(--neon-32);
  background: var(--raise);
}
.page-about .about-team-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(30px, 4.4vw, 46px);
  line-height: 1;
  color: var(--score);
}
.page-about .about-team-card--accent .about-team-num {
  color: var(--neon);
}
.page-about .about-team-card h3 {
  margin: 12px 0 6px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--fog);
}
.page-about .about-team-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mute);
}

/* 时间轴 */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  position: relative;
  display: flex;
  gap: 12px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}
.page-about .about-timeline::before {
  display: none;
}
.page-about .tl-item {
  flex: 0 0 78%;
  scroll-snap-align: start;
  padding: clamp(14px, 2vw, 20px);
  border: 1px solid var(--line);
  background: var(--panel);
}
.page-about .tl-item--now {
  border-color: var(--neon-32);
  background: var(--raise);
  box-shadow: 0 0 0 1px var(--neon-08) inset;
}
.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 3vw, 26px);
  letter-spacing: 0.02em;
  color: var(--track);
}
.page-about .tl-item--now .tl-year {
  color: var(--neon);
}
.page-about .tl-item h3 {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--fog);
}
.page-about .tl-item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mute);
}

/* 下一页入口 */
.page-about .about-next {
  margin-top: clamp(30px, 5vw, 56px);
  padding-top: clamp(26px, 4vw, 40px);
  border-top: 1px solid var(--line);
}
.page-about .about-next h2 {
  margin: 0 0 clamp(16px, 2.6vw, 24px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 3vw, 28px);
  color: var(--fog);
}
.page-about .about-next-grid {
  display: grid;
  gap: 10px;
}
.page-about .about-next-card {
  display: block;
  padding: clamp(16px, 2.2vw, 22px);
  border: 1px solid var(--line);
  background: var(--panel);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-about .about-next-card:hover,
.page-about .about-next-card:focus-visible {
  border-color: var(--neon);
  background: var(--raise);
}
.page-about .about-next-idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--neon);
}
.page-about .about-next-card h3 {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--fog);
}
.page-about .about-next-card p {
  margin: 0 0 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mute);
}
.page-about .about-next-go {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--neon);
}
.page-about .about-next-foot {
  margin: clamp(20px, 3vw, 28px) 0 0;
}
.page-about .about-next-foot .btn {
  display: inline-block;
}

/* 平板及以上 */
@media (min-width: 700px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
  .page-about .about-split--wide {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
  .page-about .about-split--reverse > .about-figure {
    order: -1;
  }
  .page-about .about-next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-vert {
    display: block;
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    max-height: 130px;
  }
  .page-about .about-timeline {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .about-timeline::before {
    display: block;
    content: "";
    position: absolute;
    left: 9px;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: var(--line);
  }
  .page-about .tl-item {
    position: relative;
    margin-left: 38px;
    padding: 0 0 26px;
    border: 0;
    background: transparent;
    box-shadow: none;
  }
  .page-about .tl-item::before {
    content: "";
    position: absolute;
    left: -36px;
    top: 5px;
    width: 15px;
    height: 15px;
    border: 1px solid var(--neon-32);
    background: var(--ink);
  }
  .page-about .tl-item--now::before {
    background: var(--neon);
    border-color: var(--neon);
    box-shadow: 0 0 0 4px var(--neon-08);
  }
  .page-about .tl-item--now {
    background: transparent;
  }
  .page-about .tl-item:last-child {
    padding-bottom: 0;
  }
}

/* 桌面 */
@media (min-width: 1000px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-index {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }
  .page-about .about-next-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-preview-list a,
  .page-about .about-index-list a,
  .page-about .about-details,
  .page-about .radius-dot,
  .page-about .radius-badge,
  .page-about .about-next-card {
    transition: none;
  }
  .page-about .radius-wrap:hover .radius-dot--key {
    transform: none;
  }
}
<<<END>>>