.page-about{
  --about-rail:96px;
  --about-measure:620px;
}

.page-about .breadcrumb{
  margin-top:clamp(18px,3vw,30px);
}
.page-about .breadcrumb ol{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:0;
  padding:0;
  font-family:var(--font-mono);
  font-size:var(--fs-label);
  letter-spacing:.14em;
  color:var(--mist);
}
.page-about .breadcrumb li{
  display:flex;
  align-items:center;
  gap:8px;
}
.page-about .breadcrumb li + li::before{
  content:"/";
  color:var(--line);
}
.page-about .breadcrumb a{
  color:var(--mist);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible{
  color:var(--lime);
  border-bottom-color:var(--lime-dim);
}
.page-about .breadcrumb a[aria-current="page"]{
  color:var(--porcelain);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  padding:clamp(34px,6vw,66px) 0 clamp(30px,4vw,50px);
  border-bottom:1px solid var(--line);
}
.page-about .about-eyebrow{
  display:flex;
  align-items:center;
  gap:10px;
  color:var(--lime);
  margin:0;
}
.page-about .about-eyebrow::before{
  content:"";
  width:30px;
  height:1px;
  background:var(--lime);
  display:block;
}
.page-about .about-title{
  font-family:var(--font-display);
  font-size:clamp(32px,6.8vw,72px);
  font-weight:800;
  line-height:1.02;
  letter-spacing:-.02em;
  margin:16px 0 0;
  max-width:17ch;
}
.page-about .about-lead{
  margin:20px 0 0;
  max-width:56ch;
  font-size:var(--fs-body);
  line-height:1.9;
  color:rgba(243,248,244,.82);
}
.page-about .about-hero-meta{
  list-style:none;
  margin:26px 0 0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:10px 24px;
  font-family:var(--font-mono);
  font-size:var(--fs-label);
  letter-spacing:.12em;
  color:var(--mist);
}
.page-about .about-hero-meta li{
  position:relative;
  padding-left:15px;
}
.page-about .about-hero-meta li::before{
  content:"";
  position:absolute;
  left:0;
  top:.6em;
  width:7px;
  height:1px;
  background:var(--lime-dim);
}

/* ---------- 布局与索引 ---------- */
.page-about .about-layout{
  display:block;
}
.page-about .about-main{
  min-width:0;
}
.page-about .about-index{
  padding:16px 0;
  border-bottom:1px solid var(--line);
}
.page-about .about-index > .u-label{
  display:none;
}
.page-about .about-index-list{
  list-style:none;
  margin:0;
  padding:0 0 2px;
  display:flex;
  gap:8px;
  overflow-x:auto;
  scrollbar-width:none;
}
.page-about .about-index-list::-webkit-scrollbar{
  display:none;
}
.page-about .about-index-link{
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  white-space:nowrap;
  padding:6px 11px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  color:var(--mist);
  text-decoration:none;
  font-size:var(--fs-note);
  transition:border-color .18s ease,color .18s ease,background .18s ease;
}
.page-about .about-index-link span{
  font-family:var(--font-mono);
  font-size:var(--fs-label);
  letter-spacing:.1em;
  color:var(--lime-dim);
}
.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible{
  border-color:var(--lime-dim);
  color:var(--porcelain);
  background:var(--lime-wash);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section{
  padding:clamp(38px,6vw,74px) 0;
  border-bottom:1px solid var(--line);
  scroll-margin-top:calc(var(--bar-h-compact) + 18px);
}
.page-about .sec-head{
  display:flex;
  align-items:baseline;
  gap:14px;
  margin:0 0 24px;
}
.page-about .sec-num{
  font-family:var(--font-mono);
  font-size:var(--fs-note);
  letter-spacing:.14em;
  color:var(--lime);
  flex:none;
}
.page-about .sec-title{
  font-family:var(--font-display);
  font-size:clamp(21px,3.4vw,26px);
  font-weight:700;
  line-height:1.35;
  letter-spacing:-.01em;
  margin:0;
}
.page-about .prose{
  max-width:var(--about-measure);
}
.page-about .prose p{
  margin:0 0 16px;
  font-size:var(--fs-body);
  line-height:1.88;
  color:rgba(243,248,244,.82);
}
.page-about .prose p:last-child{
  margin-bottom:0;
}
.page-about .prose .lead-p{
  font-size:var(--fs-lead);
  line-height:1.75;
  color:var(--porcelain);
}

/* ---------- 图文分栏 ---------- */
.page-about .split{
  display:grid;
  gap:clamp(24px,3.6vw,44px);
}
.page-about .about-figure{
  margin:0;
}
.page-about .about-figure img{
  display:block;
  width:100%;
  height:auto;
  max-width:100%;
  object-fit:cover;
}
.page-about .about-figure figcaption{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:var(--fs-label);
  letter-spacing:.12em;
  line-height:1.7;
  color:var(--mist);
}

/* ---------- 衬线引文 ---------- */
.page-about .about-quote{
  margin:clamp(34px,5vw,60px) 0;
  padding:clamp(24px,3.6vw,40px) clamp(20px,3vw,34px);
  border-left:2px solid var(--lime);
  background:linear-gradient(100deg,rgba(201,255,61,.075),rgba(201,255,61,0) 74%);
  font-family:var(--font-serif);
  font-size:clamp(18px,2.4vw,24px);
  line-height:1.8;
  color:var(--porcelain);
  max-width:40ch;
}
.page-about .about-quote cite{
  display:block;
  margin-top:14px;
  font-family:var(--font-mono);
  font-size:var(--fs-label);
  letter-spacing:.16em;
  font-style:normal;
  color:var(--mist);
}

/* ---------- 团队分工 ---------- */
.page-about .team-grid{
  display:grid;
  gap:14px;
  margin-top:24px;
}
.page-about .team-card{
  position:relative;
  padding:22px 20px 26px;
  border:1px solid var(--line);
  background:linear-gradient(160deg,rgba(22,36,31,.92),rgba(12,20,18,.88));
  backdrop-filter:blur(6px);
  transition:transform .18s ease,border-color .18s ease;
}
.page-about .team-card::after{
  content:"";
  position:absolute;
  right:0;
  bottom:0;
  width:16px;
  height:16px;
  background:var(--line);
  clip-path:polygon(100% 0,100% 100%,0 100%);
}
.page-about .team-card:hover{
  transform:translateY(-2px);
  border-color:var(--lime-dim);
}
.page-about .team-role{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:var(--fs-label);
  letter-spacing:.16em;
  color:var(--lime);
}
.page-about .team-name{
  font-family:var(--font-display);
  font-size:var(--fs-body);
  font-weight:700;
  line-height:1.55;
  margin:10px 0 0;
}
.page-about .team-card p{
  margin:10px 0 0;
  font-size:var(--fs-note);
  line-height:1.85;
  color:var(--mist);
}

/* ---------- 流程步骤 ---------- */
.page-about .flow{
  list-style:none;
  margin:26px 0 0;
  padding:0;
  display:grid;
  gap:12px;
}
.page-about .flow-step{
  padding:20px 18px 22px;
  background:var(--ink-2);
  border:1px solid var(--line);
  border-top:1px solid var(--lime-dim);
}
.page-about .flow-num{
  font-family:var(--font-mono);
  font-size:var(--fs-label);
  letter-spacing:.18em;
  color:var(--lime);
}
.page-about .flow-step h3{
  font-size:var(--fs-body);
  font-weight:700;
  margin:10px 0 8px;
}
.page-about .flow-step p{
  margin:0;
  font-size:var(--fs-note);
  line-height:1.85;
  color:var(--mist);
}
.page-about .about-section .about-figure{
  margin-top:clamp(24px,3.4vw,36px);
}

/* ---------- 时间线 ---------- */
.page-about .timeline{
  position:relative;
  list-style:none;
  margin:clamp(26px,4vw,40px) 0 0;
  padding:0 0 0 20px;
}
.page-about .timeline::before{
  content:"";
  position:absolute;
  left:0;
  top:8px;
  bottom:8px;
  width:1px;
  background:linear-gradient(180deg,var(--lime-dim),var(--line) 34%,var(--line));
}
.page-about .tl-item{
  position:relative;
  padding:0 0 30px;
  outline:none;
}
.page-about .tl-item:last-child{
  padding-bottom:0;
}
.page-about .tl-item::before{
  content:"";
  position:absolute;
  left:-24px;
  top:8px;
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--lime);
  box-shadow:0 0 0 3px var(--ink);
  transition:box-shadow .2s ease,background .2s ease;
}
.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before,
.page-about .tl-item:focus::before{
  box-shadow:0 0 0 4px rgba(201,255,61,.16);
}
.page-about .tl-year{
  display:flex;
  align-items:center;
  gap:10px;
  margin:0;
  font-family:var(--font-mono);
  font-size:var(--fs-note);
  letter-spacing:.14em;
  color:var(--lime);
  font-variant-numeric:tabular-nums;
}
.page-about .tl-ver{
  font-family:var(--font-mono);
  font-size:var(--fs-label);
  letter-spacing:.1em;
  color:var(--mist);
  border:1px solid var(--line);
  padding:1px 6px;
  border-radius:var(--radius);
}
.page-about .tl-item h3{
  margin:9px 0 0;
  font-family:var(--font-display);
  font-size:var(--fs-body);
  font-weight:700;
  line-height:1.55;
}
.page-about .tl-note{
  max-height:0;
  opacity:0;
  overflow:hidden;
  margin-top:0;
  transition:max-height .3s ease,opacity .22s ease,margin-top .22s ease;
}
.page-about .tl-item:hover .tl-note,
.page-about .tl-item:focus-within .tl-note,
.page-about .tl-item:focus .tl-note{
  max-height:200px;
  opacity:1;
  margin-top:8px;
}
.page-about .tl-note{
  font-size:var(--fs-note);
  line-height:1.85;
  color:var(--mist);
  max-width:56ch;
}

/* ---------- 覆盖规模 ---------- */
.page-about .scale-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(140px,1fr));
  gap:20px 24px;
  margin-top:clamp(26px,4vw,38px);
}
.page-about .scale-item{
  padding-top:14px;
  border-top:1px solid var(--line);
}
.page-about .scale-num{
  display:block;
  font-family:var(--font-mono);
  font-size:clamp(32px,5.2vw,54px);
  line-height:1;
  letter-spacing:-.02em;
  color:var(--lime);
  font-variant-numeric:tabular-nums;
}
.page-about .scale-item:nth-child(4) .scale-num{
  color:var(--cyan);
}
.page-about .scale-cap{
  display:block;
  margin-top:10px;
  font-size:var(--fs-note);
  line-height:1.65;
  color:var(--mist);
}

/* ---------- 使用习惯 ---------- */
.page-about .tips{
  list-style:none;
  margin:26px 0 0;
  padding:0;
}
.page-about .tip{
  display:grid;
  grid-template-columns:32px minmax(0,1fr);
  gap:14px;
  padding:20px 0;
  border-top:1px solid var(--line);
}
.page-about .tip:last-child{
  border-bottom:1px solid var(--line);
}
.page-about .tip-num{
  font-family:var(--font-mono);
  font-size:var(--fs-note);
  letter-spacing:.1em;
  color:var(--lime);
  padding-top:2px;
}
.page-about .tip h3{
  margin:0 0 6px;
  font-size:var(--fs-body);
  font-weight:700;
  line-height:1.55;
}
.page-about .tip p{
  margin:0;
  font-size:var(--fs-note);
  line-height:1.88;
  color:var(--mist);
  max-width:58ch;
}

/* ---------- 收尾路径 ---------- */
.page-about .about-next{
  padding:clamp(36px,5vw,64px) 0 clamp(28px,4vw,44px);
  border-top:1px solid var(--line);
}
.page-about .next-title{
  font-family:var(--font-display);
  font-size:clamp(21px,3.2vw,26px);
  font-weight:700;
  line-height:1.35;
  margin:0;
}
.page-about .next-text{
  margin:12px 0 0;
  max-width:52ch;
  font-size:var(--fs-note);
  line-height:1.85;
  color:var(--mist);
}
.page-about .next-links{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:22px;
}

/* ---------- 中等屏 ---------- */
@media (min-width:760px){
  .page-about .split{
    grid-template-columns:minmax(0,1fr) minmax(0,.76fr);
    align-items:start;
  }
  .page-about .flow{
    grid-template-columns:repeat(3,minmax(0,1fr));
    gap:14px;
  }
  .page-about .team-grid{
    grid-template-columns:repeat(3,minmax(0,1fr));
  }
}

/* ---------- 桌面：左索引 + 右内容 ---------- */
@media (min-width:960px){
  .page-about .about-layout{
    display:grid;
    grid-template-columns:var(--about-rail) minmax(0,1fr);
    column-gap:clamp(36px,5vw,72px);
    align-items:start;
  }
  .page-about .about-index{
    position:sticky;
    top:calc(var(--bar-h-compact) + 28px);
    border-bottom:0;
    border-top:1px solid var(--line);
    padding:20px 0 0;
  }
  .page-about .about-index > .u-label{
    display:block;
    margin:0 0 14px;
    color:var(--mist);
  }
  .page-about .about-index-list{
    display:grid;
    gap:2px;
    overflow:visible;
  }
  .page-about .about-index-link{
    border:0;
    border-radius:0;
    padding:7px 0 7px 15px;
    position:relative;
    white-space:normal;
    font-size:var(--fs-note);
    background:none;
  }
  .page-about .about-index-link::before{
    content:"";
    position:absolute;
    left:0;
    top:.95em;
    width:6px;
    height:6px;
    border-radius:50%;
    background:var(--line);
    transition:background .18s ease,box-shadow .18s ease;
  }
  .page-about .about-index-link:hover,
  .page-about .about-index-link:focus-visible{
    color:var(--porcelain);
    background:none;
  }
  .page-about .about-index-link:hover::before,
  .page-about .about-index-link:focus-visible::before{
    background:var(--lime);
    box-shadow:0 0 0 3px rgba(201,255,61,.16);
  }
  .page-about .about-quote{
    margin-left:0;
  }
}

/* ---------- 触屏设备直接展开时间线摘要 ---------- */
@media (hover:none){
  .page-about .tl-note{
    max-height:none;
    opacity:1;
    margin-top:8px;
    overflow:visible;
  }
}

@media (prefers-reduced-motion:reduce){
  .page-about .team-card,
  .page-about .about-index-link,
  .page-about .tl-item::before,
  .page-about .tl-note{
    transition:none;
  }
  .page-about .team-card:hover{
    transform:none;
  }
}
<<<END>>>