.page-about {
  --about-teal-1: var(--c-neon);
  --about-teal-2: #1FA88F;
  --about-teal-3: #12695A;
  --about-rail: 64px;
  padding-bottom: clamp(72px, 10vw, 120px);
}

.page-about .about-hero {
  padding-top: clamp(72px, 12vh, 132px);
  padding-bottom: clamp(40px, 7vw, 80px);
}

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

.page-about .about-hero-body {
  display: grid;
  gap: 36px;
  margin-top: clamp(28px, 5vw, 48px);
}

.page-about .about-hero-body .t-lede {
  margin: 0;
}

/* 首屏数据条 */
.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-grid);
  border: 1px solid var(--c-grid);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .about-facts li {
  background: var(--c-pill);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-facts .f-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(28px, 5.4vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-neon);
}

.page-about .about-facts .f-label {
  font-size: 13px;
  color: var(--c-mist);
}

/* 章节骨架 */
.page-about .about-section {
  margin-top: clamp(72px, 9vw, 112px);
}

.page-about .about-intro {
  margin: 24px 0 0;
}

.page-about .about-cols {
  display: grid;
  gap: 32px;
  margin-top: 32px;
}

.page-about .about-cols p {
  margin: 0 0 1.2em;
  max-width: 68ch;
}

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

.page-about .about-aside {
  background: var(--c-room);
  border: 1px solid var(--c-grid);
  border-radius: var(--radius-card);
  padding: 26px 24px;
}

.page-about .about-aside .eyebrow {
  margin: 0 0 16px;
}

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

.page-about .about-audience li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  align-items: baseline;
  font-size: 15px;
  color: var(--c-mist);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--c-grid);
}

.page-about .about-audience li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-audience .t-num {
  color: var(--c-lamp);
  font-size: 15px;
  flex: 0 0 auto;
}

/* 图片容器 */
.page-about .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-shot {
  margin: 0;
  align-self: start;
}

.page-about .about-banner {
  aspect-ratio: 16 / 7;
  margin: 40px 0 0;
}

.page-about .about-board {
  margin: 0;
  align-self: start;
  max-width: 460px;
}

/* 团队环形图 */
.page-about .team-figure {
  margin: 32px 0 0;
  display: grid;
  gap: 32px;
  justify-items: center;
}

.page-about .team-donut {
  width: min(300px, 74vw);
  height: auto;
  display: block;
}

.page-about .donut-track {
  fill: none;
  stroke: var(--c-pill);
  stroke-width: 22;
}

.page-about .donut-seg {
  fill: none;
  stroke-width: 22;
  transform: rotate(-90deg);
  transform-origin: 90px 90px;
  transition: stroke-width 200ms var(--ease);
}

.page-about .seg-a {
  stroke: var(--about-teal-1);
  stroke-dasharray: 146.6 439.82;
  stroke-dashoffset: 0;
}

.page-about .seg-b {
  stroke: var(--about-teal-2);
  stroke-dasharray: 171 439.82;
  stroke-dashoffset: -146.6;
}

.page-about .seg-c {
  stroke: var(--about-teal-3);
  stroke-dasharray: 122.2 439.82;
  stroke-dashoffset: -317.6;
}

.page-about .donut-core {
  fill: var(--c-lamp);
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  text-anchor: middle;
}

.page-about .donut-core-label {
  fill: var(--c-mist);
  font-family: var(--font-sans);
  font-size: 12px;
  text-anchor: middle;
}

.page-about .team-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  width: 100%;
}

.page-about .team-legend li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 18px;
  background: var(--c-pill);
  border: 1px solid var(--c-grid);
  border-radius: var(--radius-pill);
  font-size: 15px;
  color: var(--c-lamp);
  transition: border-color 200ms var(--ease);
}

.page-about .team-legend li:hover {
  border-color: var(--c-neon);
}

.page-about .team-legend .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex: 0 0 auto;
}

.page-about .lg-a .dot { background: var(--about-teal-1); }
.page-about .lg-b .dot { background: var(--about-teal-2); }
.page-about .lg-c .dot { background: var(--about-teal-3); }

.page-about .team-legend .cnt {
  margin-left: auto;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--c-mist);
}

.page-about .team-figure:has(.lg-a:hover) .seg-a,
.page-about .team-figure:has(.lg-b:hover) .seg-b,
.page-about .team-figure:has(.lg-c:hover) .seg-c {
  stroke-width: 28;
}

.page-about .about-note {
  margin: 28px 0 0;
  max-width: 68ch;
  color: var(--c-mist);
  font-size: 16px;
}

/* 发展时间线 */
.page-about .about-cols--timeline {
  margin-top: 40px;
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: var(--about-rail);
  top: 10px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-grid), rgba(30, 77, 64, 0.15));
}

.page-about .tl-item {
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  column-gap: 20px;
  padding-bottom: 34px;
}

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

.page-about .tl-year {
  position: relative;
  display: block;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-mist);
}

.page-about .tl-year::after {
  content: "";
  position: absolute;
  right: -4.5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1.5px solid var(--c-neon);
  background: var(--c-pitch);
  transition: background-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .tl-item:has(.tl-body[open]) .tl-year::after {
  background: var(--c-neon);
  box-shadow: 0 0 0 5px rgba(53, 242, 208, 0.14);
}

.page-about .tl-body summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  color: var(--c-lamp);
}

.page-about .tl-body summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-body summary .t-h3 {
  margin: 0;
}

.page-about .tl-mark {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-mist);
  border: 1px solid var(--c-grid);
  border-radius: var(--radius-pill);
  padding: 3px 12px;
  white-space: nowrap;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .tl-body[open] .tl-mark {
  color: var(--c-whistle);
  border-color: var(--c-whistle-deep);
}

.page-about .tl-body .m-close {
  display: none;
}

.page-about .tl-body[open] .m-open {
  display: none;
}

.page-about .tl-body[open] .m-close {
  display: inline;
}

.page-about .tl-body p {
  margin: 14px 0 0;
  max-width: 62ch;
  color: var(--c-mist);
  font-size: 16px;
}

/* 合作方式横向卡轨 */
.page-about .rail {
  display: flex;
  gap: 18px;
  margin: 32px calc(var(--gutter) * -1) 0;
  padding: 4px var(--gutter) 22px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--c-grid) transparent;
}

.page-about .rail-card {
  flex: 0 0 76%;
  min-width: 0;
  scroll-snap-align: start;
  background: var(--c-pill);
  border: 1px solid var(--c-grid);
  border-left: 3px solid var(--c-whistle);
  border-radius: var(--radius-card);
  padding: 24px 22px;
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .rail-card:hover {
  border-color: var(--c-neon);
  border-left-color: var(--c-whistle);
  transform: translateY(-2px);
}

.page-about .rail-no {
  margin: 0 0 12px;
  font-size: 13px;
  color: var(--c-whistle);
  letter-spacing: 0.08em;
}

.page-about .rail-card .t-h3 {
  margin: 0 0 10px;
}

.page-about .rail-card p {
  margin: 0;
  font-size: 15px;
  color: var(--c-mist);
}

/* 使用场景 */
.page-about .about-scenes {
  display: grid;
  gap: 20px;
  margin-top: 32px;
}

.page-about .scene {
  background: var(--c-pill);
  border: 1px solid var(--c-grid);
  border-radius: var(--radius-card);
  padding: 26px 24px 28px;
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .scene:hover {
  border-color: var(--c-neon);
  transform: translateY(-2px);
}

.page-about .scene-time {
  margin: 0 0 14px;
  font-size: 13px;
  color: var(--c-neon);
  letter-spacing: 0.06em;
}

.page-about .scene .t-h3 {
  margin: 0 0 10px;
}

.page-about .scene p {
  margin: 0;
  font-size: 15px;
  color: var(--c-mist);
}

.page-about .about-usage {
  margin: 32px 0 0;
  max-width: 68ch;
  color: var(--c-mist);
  font-size: 16px;
  padding-left: 18px;
  border-left: 2px solid var(--c-whistle);
}

/* 收束 */
.page-about .about-cta {
  margin-top: clamp(72px, 9vw, 112px);
  background: var(--c-room);
  border-radius: var(--radius-card) var(--radius-card) 0 0;
  padding: clamp(48px, 8vw, 92px) 0;
}

.page-about .about-cta-inner .t-h2 {
  margin: 14px 0 0;
}

.page-about .about-cta-inner .t-lede {
  margin: 18px 0 0;
}

.page-about .about-cta-actions {
  margin-top: 32px;
  align-items: center;
}

.page-about .about-cta-fix {
  margin: 26px 0 0;
  font-size: 15px;
  color: var(--c-mist);
}

/* 响应式 */
@media (min-width: 720px) {
  .page-about {
    --about-rail: 88px;
  }

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

  .page-about .about-facts li {
    padding: 24px 20px;
  }

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

  .page-about .rail-card {
    flex-basis: 42%;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-rail: 96px;
  }

  .page-about .about-hero-body {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: clamp(40px, 6vw, 72px);
    align-items: end;
  }

  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(36px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-cols--media {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 64px);
    align-items: center;
  }

  .page-about .about-cols--timeline {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: clamp(40px, 6vw, 80px);
    align-items: start;
  }

  .page-about .team-figure {
    grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
    align-items: center;
    justify-items: stretch;
  }

  .page-about .about-banner {
    margin-top: 56px;
  }
}

@media (min-width: 1100px) {
  .page-about .rail-card {
    flex-basis: 27%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .donut-seg,
  .page-about .rail-card,
  .page-about .scene,
  .page-about .team-legend li,
  .page-about .tl-year::after {
    transition: none;
  }

  .page-about .rail-card:hover,
  .page-about .scene:hover {
    transform: none;
  }
}
<<<END>>>