.page-about {
  position: relative;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: 88px;
  padding-bottom: 12px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(12px, 2vw, 24px) 0 clamp(56px, 8vw, 104px);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -2;
  inset: -22% -12% 34% 42%;
  background: linear-gradient(140deg, var(--panel) 0%, var(--panel-2) 62%, rgba(10, 47, 38, 0) 100%);
  clip-path: polygon(0 10%, 100% 0, 100% 88%, 0 100%);
  opacity: .95;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  top: 8%;
  right: 6%;
  width: 2px;
  height: 62%;
  background: linear-gradient(to bottom, transparent, var(--accent), transparent);
  transform: rotate(15deg);
  opacity: .35;
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}

.page-about .about-hero__copy { max-width: 42ch; }

.page-about .about-hero__copy .eyebrow { margin-bottom: 14px; }

.page-about .about-hero h1 {
  font-size: clamp(30px, 6vw, 58px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--text);
  margin: 0 0 20px;
}

.page-about .about-hero__lede {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
  color: var(--muted);
  margin: 0 0 28px;
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__fig { margin: 0; }

.page-about .about-hero__fig .media {
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: 0 24px 60px -30px rgba(0, 0, 0, .8);
}

.page-about .media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
}

.page-about .media {
  position: relative;
}

.page-about .media-14x9 { aspect-ratio: 14 / 9; overflow: hidden; border-radius: var(--r-lg); }
.page-about .media-14x9 img { width: 100%; height: 100%; object-fit: cover; }

/* ---------- 通用章节骨架 ---------- */
.page-about .about-sec {
  padding: clamp(48px, 7vw, 96px) 0;
  position: relative;
}

.page-about .about-sec__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

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

.page-about .about-sec__body h2 {
  font-size: clamp(22px, 3.4vw, 34px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -.005em;
  color: var(--text);
  margin: 0 0 18px;
  max-width: 26ch;
}

.page-about .about-sec__body > p {
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0 0 16px;
  max-width: 64ch;
}

/* ---------- 起点 ---------- */
.page-about .origin-facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .origin-fact {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(10, 47, 38, .7), rgba(4, 35, 27, .4));
}

.page-about .origin-fact__num {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -.01em;
  min-width: 5.5ch;
}

.page-about .origin-fact__label {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

/* ---------- 团队 ---------- */
.page-about .role-stack {
  margin: 28px 0 34px;
  display: grid;
  gap: 14px;
}

.page-about .role-card {
  padding: 20px 22px;
  border-radius: var(--r-md);
  background: var(--panel);
  border: 1px solid var(--line);
  cursor: default;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .role-card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.page-about .role-card__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.page-about .role-card__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

.page-about .role-card__num {
  font-size: 14px;
  color: var(--accent);
  flex-shrink: 0;
}

.page-about .role-card__track {
  height: 8px;
  border-radius: var(--r-pill);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .role-card__fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
  transition: width var(--dur) var(--ease);
}

.page-about .role-card__fill--ops {
  background: linear-gradient(90deg, var(--slate), var(--accent-soft));
}

.page-about .role-card__fill--data { width: 34%; }
.page-about .role-card__fill--ops  { width: 66%; }

.page-about .role-card__desc {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
  transition: max-height .34s var(--ease), opacity .3s var(--ease), margin-top .3s var(--ease);
}

@media (hover: hover) {
  .page-about .role-card:hover .role-card__desc {
    max-height: 140px;
    opacity: 1;
    margin-top: 12px;
  }
  .page-about .role-card:hover { border-color: rgba(41, 242, 192, .45); }
}

.page-about .role-card:focus-within .role-card__desc,
.page-about .role-card:focus .role-card__desc {
  max-height: 140px;
  opacity: 1;
  margin-top: 12px;
}

.page-about .team-figure { margin: 0; }

.page-about .team-figure figcaption {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 60ch;
}

/* ---------- 覆盖 ---------- */
.page-about .coverage-visual {
  margin: 28px 0 22px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: start;
}

.page-about .coverage-bars {
  display: grid;
  gap: 10px;
}

.page-about .cov-bar {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 18px;
  border-radius: var(--r-md);
  background: var(--ink-850);
  border-left: 3px solid var(--accent);
}

.page-about .cov-bar--hot {
  border-left-color: var(--hot);
}

.page-about .cov-bar__num {
  font-size: clamp(20px, 2.8vw, 26px);
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
}

.page-about .cov-bar--hot .cov-bar__num { color: var(--hot); }

.page-about .cov-bar__unit {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

.page-about .coverage-note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 62ch;
  padding-left: 16px;
  border-left: 2px solid var(--line);
}

/* ---------- 里程碑时间轴 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 0 0 30px 30px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, rgba(41, 242, 192, .55), rgba(41, 242, 192, .06));
}

.page-about .about-tl__item:last-child { padding-bottom: 0; }
.page-about .about-tl__item:last-child::before { display: none; }

.page-about .about-tl__stamp {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--accent);
  letter-spacing: .04em;
}

.page-about .about-tl__node {
  position: absolute;
  left: -30px;
  top: 50%;
  transform: translateY(-50%);
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(41, 242, 192, .16);
}

.page-about .about-tl__node--hot {
  background: var(--hot);
  box-shadow: 0 0 0 4px rgba(255, 90, 46, .18);
}

.page-about .about-tl__body h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  color: var(--text);
  line-height: 1.4;
}

.page-about .about-tl__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 58ch;
}

/* ---------- 质量 ---------- */
.page-about .quality-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 28px 0 24px;
}

.page-about .quality-card {
  padding: 20px 22px;
  border-radius: var(--r-md);
  background: var(--panel);
  border: 1px solid var(--line);
}

.page-about .quality-card__idx {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--accent);
  margin-bottom: 10px;
}

.page-about .quality-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 800;
  color: var(--text);
}

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

.page-about .quality-note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 62ch;
  padding: 16px 20px;
  border-radius: var(--r-md);
  background: linear-gradient(135deg, rgba(255, 90, 46, .08), transparent 70%);
  border: 1px solid rgba(255, 90, 46, .2);
}

/* ---------- 合作 ---------- */
.page-about .partner-list {
  list-style: none;
  margin: 26px 0 30px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .partner-item {
  padding: 18px 20px;
  border-radius: var(--r-md);
  background: var(--ink-850);
  border: 1px solid var(--line);
  display: grid;
  gap: 8px;
}

.page-about .partner-item__tag {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--accent);
  text-transform: uppercase;
}

.page-about .partner-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .partner-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 侧边章节索引（窄屏隐藏） ---------- */
.page-about .lane-index {
  display: none;
}

/* ---------- ≥600px ---------- */
@media (min-width: 600px) {
  .page-about .origin-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .origin-fact {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
  .page-about .quality-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .partner-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- ≥860px：章节轨道 ---------- */
@media (min-width: 860px) {
  .page-about .about-sec__grid {
    grid-template-columns: 58px minmax(0, 1fr);
    gap: 36px;
  }

  .page-about .about-sec__rail {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    padding-top: 8px;
  }

  .page-about .rail-num {
    font-size: 13px;
    letter-spacing: .2em;
    color: var(--accent);
  }

  .page-about .rail-line {
    flex: 1;
    width: 2px;
    min-height: 90px;
    border-radius: 2px;
    background: linear-gradient(to bottom, var(--accent) 0%, rgba(41, 242, 192, .12) 100%);
  }

  .page-about .rail-label {
    writing-mode: vertical-rl;
    font-size: 11px;
    letter-spacing: .3em;
    color: var(--muted);
  }

  .page-about .coverage-visual {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: 28px;
  }

  .page-about .about-tl__item {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: baseline;
    gap: 28px;
    padding-left: 34px;
  }

  .page-about .about-tl__node { left: -34px; }
  .page-about .about-tl__item::before { left: 6px; }
}

/* ---------- ≥960px：首屏分栏 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .breadcrumb {
    padding-top: 96px;
  }
}

/* ---------- ≥1440px：常驻索引条 ---------- */
@media (min-width: 1440px) {
  .page-about .lane-index {
    position: fixed;
    right: 22px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 14px;
    z-index: 20;
    padding: 18px 14px;
    border-radius: var(--r-md);
    background: rgba(4, 35, 27, .72);
    backdrop-filter: blur(8px);
    border: 1px solid var(--line);
  }

  .page-about .lane-index a {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12.5px;
    color: var(--muted);
    text-decoration: none;
    transition: color var(--dur) var(--ease);
  }

  .page-about .lane-index a .idx {
    font-size: 11px;
    color: var(--accent);
    opacity: .6;
    transition: opacity var(--dur) var(--ease);
  }

  .page-about .lane-index a:hover,
  .page-about .lane-index a:focus-visible {
    color: var(--text);
  }

  .page-about .lane-index a:hover .idx,
  .page-about .lane-index a:focus-visible .idx {
    opacity: 1;
  }

  .page-about .lane-index a[aria-current="true"] {
    color: var(--accent);
  }

  .page-about .lane-index a[aria-current="true"] .idx {
    opacity: 1;
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .role-card__desc,
  .page-about .role-card__fill {
    transition: none;
  }
}
<<<END>>>