.page-about{
  --about-rail-w:212px;
  --about-gap:clamp(20px,3.2vw,56px);
  --about-sec:clamp(56px,7vw,104px);
  color:var(--white);
  font-family:var(--sans);
  padding-top:clamp(12px,2.4vw,28px);
  padding-bottom:clamp(40px,6vw,88px);
  overflow-x:hidden;
}

/* 面包屑 */
.page-about .about-crumbs{
  font-size:13px;
  color:var(--muted);
  display:flex;
  align-items:center;
  gap:8px;
  flex-wrap:wrap;
}
.page-about .about-crumbs a{
  color:var(--muted);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .24s var(--ease),border-color .24s var(--ease);
}
.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible{
  color:var(--lime);
  border-bottom-color:var(--lime);
}

/* 首屏 */
.page-about .about-hero{
  position:relative;
  margin-top:clamp(18px,3.4vw,40px);
  padding-bottom:clamp(24px,4vw,44px);
  border-bottom:1px solid var(--line);
}
.page-about .about-hero__title{
  margin:16px 0 20px;
  font-size:clamp(34px,7.2vw,84px);
  line-height:1.02;
  font-weight:900;
  letter-spacing:-.02em;
  max-width:17ch;
}
.page-about .about-hero__lede{
  margin:0;
  max-width:60ch;
  font-size:clamp(15px,1.6vw,17px);
  line-height:1.8;
  color:var(--muted);
}
.page-about .about-hero__note{
  display:none;
  position:absolute;
  right:clamp(6px,1vw,14px);
  top:8px;
  color:var(--muted);
}
.page-about .about-hero__stats{
  list-style:none;
  margin:clamp(26px,3.4vw,40px) 0 0;
  padding:0;
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.page-about .about-hero__stats li{
  background:var(--ink-0);
  padding:14px 16px;
  display:flex;
  flex-direction:column;
  gap:6px;
  min-width:0;
}
.page-about .about-stat__v{
  font-family:var(--mono);
  font-size:clamp(20px,2.6vw,30px);
  line-height:1;
  color:var(--lime);
  letter-spacing:-.02em;
}
.page-about .about-stat__k{
  font-size:12px;
  letter-spacing:.08em;
  color:var(--muted);
}

/* 布局：侧轨 + 主内容 */
.page-about .about-layout{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:var(--about-gap);
  margin-top:clamp(32px,4.6vw,60px);
}
.page-about .about-rail{
  align-self:start;
  min-width:0;
}
.page-about .about-rail__eyebrow{
  margin:0 0 10px;
  color:var(--muted);
  font-size:11px;
}
.page-about .about-rail__list{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  gap:1px;
  overflow-x:auto;
  border:1px solid var(--line);
  -webkit-overflow-scrolling:touch;
  scrollbar-width:thin;
}
.page-about .about-rail__list li{flex:0 0 auto;}
.page-about .about-rail__link{
  display:flex;
  align-items:center;
  gap:8px;
  padding:11px 14px;
  font-size:13px;
  color:var(--muted);
  text-decoration:none;
  white-space:nowrap;
  transition:color .24s var(--ease),background .24s var(--ease);
}
.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible{
  color:var(--lime);
  background:var(--ink-1);
}
.page-about .about-rail__num{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.04em;
  color:var(--line);
}

/* 章节 */
.page-about .about-flow{min-width:0;}
.page-about .about-chapter{
  margin-bottom:var(--about-sec);
  scroll-margin-top:96px;
}
.page-about .about-chapter__head{
  display:flex;
  align-items:flex-end;
  gap:clamp(12px,2vw,22px);
  padding-bottom:12px;
  margin-bottom:clamp(18px,2.6vw,30px);
  border-bottom:1px solid var(--line);
}
.page-about .about-chapter__num{
  font-family:var(--mono);
  font-size:clamp(30px,6vw,54px);
  line-height:.8;
  letter-spacing:-.04em;
  color:var(--line);
  transition:color 360ms var(--ease);
}
.page-about .about-chapter.is-in .about-chapter__num{color:var(--lime);}
.page-about .about-chapter__title{
  margin:0;
  font-size:clamp(21px,3.2vw,38px);
  line-height:1.16;
  font-weight:800;
  letter-spacing:-.015em;
}
.page-about .about-chapter__tag{
  display:none;
  margin-left:auto;
  color:var(--muted);
}
.page-about .about-chapter__lede{
  margin:0 0 clamp(20px,2.8vw,32px);
  max-width:64ch;
  font-size:16px;
  line-height:1.8;
  color:var(--muted);
}
.page-about .about-chapter__grid{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(20px,3vw,40px);
}
.page-about .about-chapter__grid--offset{margin-top:clamp(22px,3.4vw,44px);}
.page-about .about-chapter__text{min-width:0;}
.page-about .about-chapter__text p{
  margin:0 0 16px;
  max-width:66ch;
  font-size:16px;
  line-height:1.82;
  color:var(--white);
}
.page-about .about-chapter__text p:last-child{margin-bottom:0;}
.page-about .about-sub{
  margin:0 0 12px;
  font-size:18px;
  font-weight:700;
  line-height:1.4;
  color:var(--white);
}
.page-about .about-sign{
  margin-top:22px !important;
  color:var(--muted);
  font-size:14px;
}
.page-about .about-inline-link{
  color:var(--cyan);
  text-decoration:none;
  border-bottom:1px solid var(--line);
  transition:border-color .24s var(--ease),color .24s var(--ease);
}
.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible{
  color:var(--lime);
  border-bottom-color:var(--lime);
}

/* 图片 */
.page-about .about-fig{
  margin:0;
  position:relative;
  border:1px solid var(--line);
  background:var(--ink-1);
  overflow:hidden;
}
.page-about .about-fig img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.page-about .about-fig--wide{aspect-ratio:16/10;}
.page-about .about-fig--std{aspect-ratio:3/2;}
.page-about .about-fig--band{aspect-ratio:7/3;margin-top:clamp(24px,3.4vw,40px);}

/* 时间线 */
.page-about .timeline{
  list-style:none;
  margin:0;
  padding:0;
}
.page-about .timeline__item{
  position:relative;
  padding:0 0 clamp(22px,3vw,32px) clamp(20px,2.4vw,30px);
  border-left:1px solid var(--line);
}
.page-about .timeline__item:last-child{
  border-left-color:transparent;
  padding-bottom:0;
}
.page-about .timeline__item::before{
  content:"";
  position:absolute;
  left:-4px;
  top:8px;
  width:7px;
  height:7px;
  background:var(--ink-0);
  border:1px solid var(--line);
  transition:background .3s var(--ease),border-color .3s var(--ease);
}
.page-about .timeline__item:hover::before{
  background:var(--lime);
  border-color:var(--lime);
}
.page-about .timeline__year{
  display:block;
  font-family:var(--mono);
  font-size:clamp(17px,2.4vw,24px);
  line-height:1;
  letter-spacing:-.02em;
  color:var(--lime);
}
.page-about .timeline__item--alt .timeline__year{color:var(--orange);}
.page-about .timeline__title{
  margin:8px 0 6px;
  font-size:16px;
  font-weight:700;
  line-height:1.4;
}
.page-about .timeline__item p{
  margin:0;
  max-width:62ch;
  font-size:15px;
  line-height:1.72;
  color:var(--muted);
}

/* 团队分工 */
.page-about .team-bar{
  display:flex;
  height:64px;
  margin:clamp(18px,2.6vw,26px) 0 14px;
  border:1px solid var(--line);
}
.page-about .team-bar__seg{
  flex-grow:1;
  flex-basis:0;
  min-width:0;
  display:flex;
  align-items:center;
  justify-content:center;
  font-family:var(--mono);
  font-size:14px;
  border-right:1px solid var(--line);
  transition:opacity .24s var(--ease);
}
.page-about .team-bar__seg:last-child{border-right:0;}
.page-about .team-bar__seg--verify{flex-grow:18;background:var(--lime);color:var(--ink-0);}
.page-about .team-bar__seg--edit{flex-grow:12;background:var(--ink-2);color:var(--white);}
.page-about .team-bar__seg--tech{flex-grow:16;background:transparent;color:var(--cyan);}
.page-about .team-bar:hover .team-bar__seg{opacity:.45;}
.page-about .team-bar:hover .team-bar__seg:hover{opacity:1;}
.page-about .team-legend{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:10px 22px;
}
.page-about .team-legend li{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:13px;
  color:var(--muted);
}
.page-about .team-legend__dot{
  width:8px;
  height:8px;
  flex:0 0 auto;
}
.page-about .team-legend__dot--verify{background:var(--lime);}
.page-about .team-legend__dot--edit{background:var(--ink-2);border:1px solid var(--line);}
.page-about .team-legend__dot--tech{background:transparent;border:1px solid var(--cyan);}

/* 六类字段 */
.page-about .field-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
  margin-bottom:clamp(24px,3.4vw,40px);
}
.page-about .field-card{
  background:var(--ink-0);
  padding:14px 14px 16px;
  min-width:0;
  transition:background .24s var(--ease);
}
.page-about .field-card:hover{background:var(--ink-1);}
.page-about .field-card__name{
  display:block;
  margin-bottom:8px;
  font-size:15px;
  font-weight:700;
  color:var(--lime);
}
.page-about .field-card__src{
  margin:0;
  font-size:13px;
  line-height:1.68;
  color:var(--muted);
}

/* 合作生态 */
.page-about .partner-wall{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.page-about .partner-card{
  background:var(--ink-1);
  padding:20px 18px 22px;
  min-width:0;
  border-left:1px solid transparent;
  transition:background .26s var(--ease),border-color .26s var(--ease);
}
.page-about .partner-card:hover{
  background:var(--ink-2);
  border-left-color:var(--lime);
}
.page-about .partner-card__n{
  display:block;
  font-family:var(--mono);
  font-size:clamp(28px,4vw,42px);
  line-height:1;
  letter-spacing:-.03em;
  color:var(--lime);
}
.page-about .partner-card__t{
  margin:12px 0 8px;
  font-size:16px;
  font-weight:700;
}
.page-about .partner-card__d{
  margin:0;
  font-size:14px;
  line-height:1.7;
  color:var(--muted);
}

/* 服务范围 */
.page-about .reach-list{
  list-style:none;
  margin:0 0 clamp(24px,3.4vw,40px);
  padding:0;
  border-top:1px solid var(--line);
}
.page-about .reach-list li{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:6px 18px;
  padding:14px 0;
  border-bottom:1px solid var(--line);
}
.page-about .reach-list__k{
  font-size:14px;
  color:var(--muted);
}
.page-about .reach-list__v{
  font-family:var(--mono);
  font-size:14px;
  color:var(--white);
  text-align:right;
}

/* 收尾呼唤 */
.page-about .about-cta{
  margin-top:clamp(12px,2vw,24px);
  padding:clamp(24px,4vw,52px);
  border:1px solid var(--line);
  background:var(--grad);
  scroll-margin-top:96px;
}
.page-about .about-cta__title{
  margin:12px 0 14px;
  font-size:clamp(22px,3.4vw,40px);
  line-height:1.15;
  font-weight:800;
  letter-spacing:-.015em;
}
.page-about .about-cta__lede{
  margin:0;
  max-width:62ch;
  font-size:16px;
  line-height:1.8;
  color:var(--muted);
}
.page-about .about-cta__actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:clamp(20px,2.6vw,28px);
}

/* 平板及以上 */
@media (min-width:700px){
  .page-about .partner-wall{grid-template-columns:repeat(3,minmax(0,1fr));}
}

@media (min-width:768px){
  .page-about .about-hero__stats{grid-template-columns:repeat(4,minmax(0,1fr));}
  .page-about .field-grid{grid-template-columns:repeat(3,minmax(0,1fr));}
}

@media (min-width:900px){
  .page-about .about-chapter__grid{grid-template-columns:minmax(0,7fr) minmax(0,5fr);align-items:start;}
  .page-about .about-chapter__grid--offset .about-fig,
  .page-about .about-chapter__grid--offset .about-chapter__text:nth-child(2){margin-top:clamp(0px,3vw,52px);}
}

@media (min-width:1024px){
  .page-about .about-layout{grid-template-columns:var(--about-rail-w) minmax(0,1fr);}
  .page-about .about-rail{position:sticky;top:88px;}
  .page-about .about-rail__list{
    flex-direction:column;
    overflow:visible;
    border:0;
    border-left:1px solid var(--line);
  }
  .page-about .about-rail__link{
    position:relative;
    padding:9px 0 9px 16px;
    font-size:13px;
  }
  .page-about .about-rail__link::before{
    content:"";
    position:absolute;
    left:-3px;
    top:50%;
    transform:translateY(-50%);
    width:5px;
    height:5px;
    background:var(--line);
    transition:background .24s var(--ease);
  }
  .page-about .about-rail__link:hover::before,
  .page-about .about-rail__link:focus-visible::before{background:var(--lime);}
  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible{background:transparent;}
  .page-about .about-hero__note{display:block;}
  .page-about .about-chapter__tag{display:block;}
}
<<<END>>>