.page-about {
  --about-gap: clamp(28px, 4vw, 56px);
  background: var(--c-void);
  color: var(--c-cream);
  font-family: var(--font-body);
  padding-bottom: 88px;
  overflow-x: clip;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 22px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-stone);
}

.page-about .breadcrumb-link {
  color: var(--c-silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .breadcrumb-link:hover {
  color: var(--c-cream);
  border-bottom-color: var(--c-cyan);
}

.page-about .breadcrumb-sep {
  color: var(--c-cyan-deep);
}

.page-about .breadcrumb-current {
  color: var(--c-orange-soft);
}

.page-about a:focus-visible {
  outline: 2px solid var(--c-orange);
  outline-offset: 3px;
}

/* ---------- 分屏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  padding-top: 20px;
}

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

.page-about .about-rail {
  display: none;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: clamp(20px, 3vw, 32px);
}

.page-about .hero-eyebrow {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .hero-title {
  margin: 14px 0 18px;
  font-size: clamp(29px, 5.4vw, 52px);
  line-height: 1.16;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--c-cream);
}

.page-about .hero-lead {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-silver);
}

.page-about .hero-media {
  position: relative;
  margin-top: 26px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--c-night);
}

.page-about .hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 10, 18, 0.1) 0%, rgba(6, 10, 18, 0.72) 100%);
  pointer-events: none;
}

.page-about .hero-badge {
  position: absolute;
  left: 14px;
  bottom: 14px;
  z-index: 1;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background: var(--glass-solid);
  border: 1px solid var(--line-cyan);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 18px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .hero-stat {
  background: var(--c-night);
  padding: 14px 12px;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(18px, 3.4vw, 26px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-orange);
}

.page-about .stat-label {
  display: block;
  margin-top: 4px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-stone);
}

/* ---------- 章节通用 ---------- */
.page-about .chapter {
  padding: clamp(28px, 4.4vw, 48px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .chapter-num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.26em;
  color: var(--c-cyan);
}

.page-about .chapter-title {
  margin: 0 0 16px;
  font-size: clamp(22px, 3.6vw, 33px);
  line-height: 1.28;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--c-cream);
}

.page-about .chapter p {
  margin: 0 0 16px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-silver);
}

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

.page-about .chapter-lead {
  color: var(--c-cream) !important;
  font-weight: 600;
}

.page-about .text-link {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  padding-bottom: 1px;
}

.page-about .text-link:hover {
  color: var(--c-cream);
  border-bottom-color: var(--c-orange);
}

/* ---------- 02 场景 ---------- */
.page-about .scenario-grid {
  display: grid;
  gap: 20px;
  margin: 8px 0 4px;
}

.page-about .scenario-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .scenario-item {
  padding: 16px 18px;
  background: var(--c-night);
  border-left: 2px solid var(--c-orange);
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
}

.page-about .scenario-item:nth-child(2) {
  border-left-color: var(--c-cyan);
}

.page-about .scenario-item:nth-child(3) {
  border-left-color: var(--c-clay);
}

.page-about .scenario-title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-cream);
}

.page-about .scenario-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-silver);
}

.page-about .portrait-media {
  margin: 0;
  border-radius: var(--radius-card);
  border: 1px solid var(--line-soft);
  overflow: hidden;
  background: var(--c-carbon);
}

.page-about .portrait-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  filter: saturate(0.9);
}

/* ---------- 03 原则 + 横向轨道 ---------- */
.page-about .principle-list {
  list-style: none;
  margin: 6px 0 22px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .principle-item {
  padding: 14px 16px;
  background: var(--c-night);
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-silver);
}

.page-about .principle-item strong {
  display: block;
  margin-bottom: 3px;
  color: var(--c-orange-soft);
  font-weight: 700;
}

.page-about .track-demo {
  display: flex;
  gap: 10px;
  padding: 4px 2px 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .demo-round {
  flex: 0 0 132px;
  scroll-snap-align: start;
  display: grid;
  gap: 8px;
  padding: 14px 12px;
  background: var(--c-carbon);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-card);
}

.page-about .demo-num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-cream);
}

.page-about .demo-time {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

.page-about .demo-pair {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.page-about .demo-vs {
  color: var(--c-stone);
  font-size: 12px;
}

.page-about .track-note {
  margin: 0 !important;
  font-size: 13px !important;
  color: var(--c-stone) !important;
}

/* ---------- 04 版本轴 ---------- */
.page-about .version-axis {
  position: relative;
  margin: 10px 0 20px;
  padding-left: 30px;
}

.page-about .version-axis::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-cyan-deep), var(--c-orange));
  opacity: 0.85;
}

.page-about .version-node {
  position: relative;
  padding-bottom: 24px;
}

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

.page-about .version-dot {
  position: absolute;
  left: -25px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--glass-solid);
  border: 2px solid var(--c-orange);
  box-shadow: 0 0 0 4px rgba(6, 10, 18, 0.9);
}

.page-about .version-tag {
  display: inline-block;
  margin-bottom: 6px;
  padding: 3px 9px;
  border-radius: var(--radius-pill);
  background: rgba(37, 230, 214, 0.12);
  border: 1px solid var(--line-cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}

.page-about .version-title {
  margin: 0 0 6px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--c-cream);
}

.page-about .version-text {
  margin: 0 0 10px;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-silver);
}

.page-about .version-link {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-orange-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .version-link:hover {
  border-bottom-color: var(--c-orange);
  color: var(--c-orange);
}

/* ---------- 05 团队 ---------- */
.page-about .team-wrap {
  display: grid;
  gap: 18px;
  margin-top: 8px;
}

.page-about .team-grid {
  display: grid;
  gap: 12px;
}

.page-about .team-card {
  padding: 16px;
  background: var(--c-night);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-card);
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .team-card:hover {
  border-color: var(--line-cyan);
}

.page-about .team-num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--c-clay);
}

.page-about .team-name {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-cream);
}

.page-about .team-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-silver);
}

.page-about .team-media {
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--c-carbon);
}

.page-about .team-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 06 生态 ---------- */
.page-about .ecosystem {
  display: grid;
  gap: 20px;
  margin-top: 8px;
}

.page-about .eco-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .eco-stat {
  background: var(--c-carbon);
  padding: 14px 12px;
}

.page-about .eco-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 4vw, 28px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-cyan);
}

.page-about .eco-plus {
  color: var(--c-orange);
  font-size: 0.7em;
}

.page-about .eco-label {
  display: block;
  margin-top: 6px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-stone);
}

.page-about .eco-body p {
  margin: 0 0 14px;
}

.page-about .btn-cyan {
  display: inline-block;
}

/* ---------- 收尾 CTA ---------- */
.page-about .about-cta {
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: clamp(22px, 3.6vw, 36px);
  border: 1px solid var(--line-mid);
  border-radius: var(--radius-card);
  background:
    linear-gradient(135deg, rgba(255, 106, 26, 0.16), rgba(37, 230, 214, 0.1) 65%, rgba(6, 10, 18, 0) 100%),
    var(--c-night);
}

.page-about .cta-title {
  margin: 0 0 12px;
  font-size: clamp(21px, 3vw, 28px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--c-cream);
}

.page-about .cta-text {
  margin: 0 0 20px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-silver);
}

.page-about .btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 回到本轮胶囊 ---------- */
.page-about .about-return {
  position: fixed;
  right: 14px;
  bottom: 14px;
  z-index: 40;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  background: var(--glass-solid);
  border: 1px solid var(--c-cyan-deep);
  color: var(--c-cream);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-decoration: none;
  backdrop-filter: blur(8px);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .about-return::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-orange);
}

.page-about .about-return:hover {
  border-color: var(--c-cyan);
  color: var(--c-cyan);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 700px) {
  .page-about .scenario-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.66fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 14px;
  }

  .page-about .ecosystem {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .eco-stats {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: minmax(150px, 0.34fr) minmax(0, 0.66fr);
    gap: clamp(32px, 4.6vw, 64px);
    padding-top: 34px;
    align-items: start;
  }

  .page-about .about-rail {
    display: grid;
    grid-template-columns: 26px minmax(0, 1fr);
    gap: 14px;
    align-items: start;
    position: sticky;
    top: 104px;
  }

  .page-about .rail-version {
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--c-stone);
    padding-top: 6px;
  }

  .page-about .rail-list {
    list-style: none;
    margin: 0;
    padding: 0;
    border-left: 1px solid var(--line-soft);
  }

  .page-about .rail-link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 9px 4px 9px 14px;
    margin-left: -1px;
    border-left: 2px solid transparent;
    text-decoration: none;
    color: var(--c-silver);
    font-size: 13px;
    transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
  }

  .page-about .rail-num {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.08em;
    color: var(--c-stone);
    transition: color 0.18s var(--ease);
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    border-left-color: var(--c-cyan);
    color: var(--c-cream);
  }

  .page-about .rail-link:hover .rail-num,
  .page-about .rail-link:focus-visible .rail-num {
    color: var(--c-cyan);
  }

  .page-about .about-return {
    right: 28px;
    bottom: 28px;
  }

  .page-about .team-wrap {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .team-media img {
    aspect-ratio: 4 / 5;
  }

  .page-about .hero-stats {
    max-width: 620px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
<<<END>>>