.page-about{
  --ab-line:2px solid var(--dk-ink);
  --ab-dash:1px dashed rgba(14,47,46,.32);
  --ab-gap:clamp(22px,4vw,44px);
  background:var(--dk-paper);
  color:var(--dk-ink);
  font-family:var(--dk-font-body);
  overflow-x:hidden;
}
.page-about *{box-sizing:border-box;}
.page-about img{max-width:100%;height:auto;}

/* ---------- 首屏 ---------- */
.page-about .ab-hero{
  position:relative;
  background:var(--dk-snow);
  border-bottom:var(--ab-line);
  padding:0 0 clamp(30px,6vw,72px);
  overflow:hidden;
}
.page-about .ab-hero__inner{position:relative;z-index:2;padding-top:14px;}
.page-about .ab-crumb{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  font-family:var(--dk-font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--dk-slate);
  padding-bottom:clamp(18px,4vw,36px);
}
.page-about .ab-crumb a{color:var(--dk-teal);text-decoration:none;}
.page-about .ab-crumb a:hover{color:var(--dk-orange);}
.page-about .ab-crumb [aria-current="page"]{color:var(--dk-ink);}

.page-about .ab-hero__deco{
  position:absolute;
  left:0;right:0;bottom:0;
  height:110px;
  pointer-events:none;
  z-index:0;
}
.page-about .ab-hero__deco svg{display:block;width:100%;height:100%;}

.page-about .ab-hero__grid{
  display:grid;
  gap:clamp(24px,4vw,38px);
}
.page-about .ab-hero__title{
  margin:14px 0 0;
  font-family:var(--dk-font-display);
  font-weight:700;
  font-size:clamp(34px,7.6vw,74px);
  line-height:1;
  letter-spacing:-.02em;
}
.page-about .ab-hero__lede{
  margin:20px 0 0;
  max-width:36em;
  font-size:clamp(15px,1.6vw,17px);
  line-height:1.8;
  color:var(--dk-ink);
}
.page-about .ab-hero__meta{
  list-style:none;
  margin:24px 0 0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:8px 22px;
  font-size:12px;
  letter-spacing:.04em;
  color:var(--dk-slate);
}
.page-about .ab-hero__meta li{
  border-left:4px solid var(--dk-orange);
  padding-left:10px;
}
.page-about .ab-hero__meta span{
  color:var(--dk-ink);
  font-size:16px;
  font-weight:700;
  margin-right:4px;
}

/* ---------- 章节索引 ---------- */
.page-about .ab-toc{
  border:var(--ab-line);
  background:var(--dk-paper);
  box-shadow:var(--dk-shadow-soft);
  align-self:start;
}
.page-about .ab-toc__head{
  margin:0;
  padding:10px 14px;
  background:var(--dk-teal);
  color:var(--dk-paper);
  font-family:var(--dk-font-mono);
  font-size:11px;
  letter-spacing:.16em;
}
.page-about .ab-toc__list{list-style:none;margin:0;padding:0;}
.page-about .ab-toc__link{
  display:flex;
  align-items:baseline;
  gap:12px;
  padding:11px 14px;
  border-top:var(--ab-dash);
  color:var(--dk-ink);
  text-decoration:none;
  font-size:15px;
  transition:background var(--dk-ease),color var(--dk-ease),padding-left var(--dk-ease);
}
.page-about .ab-toc__list li:first-child .ab-toc__link{border-top:0;}
.page-about .ab-toc__link:hover,
.page-about .ab-toc__link:focus-visible{
  background:var(--dk-sand);
  padding-left:20px;
}
.page-about .ab-toc__link:focus-visible{
  outline:3px solid var(--dk-lime);
  outline-offset:-3px;
}
.page-about .ab-toc__num{
  font-family:var(--dk-font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--dk-sand-deep);
}

/* ---------- 通用章节 ---------- */
.page-about .ab-section{
  padding:clamp(42px,7vw,92px) 0;
  border-bottom:var(--ab-line);
}
.page-about .ab-section--sand{background:var(--dk-sand);}
.page-about .ab-section--snow{background:var(--dk-snow);}
.page-about .ab-section--ink{background:var(--dk-ink);color:var(--dk-paper);border-bottom:0;}

.page-about .ab-head{margin-bottom:clamp(26px,4vw,48px);}
.page-about .ab-head__title{
  margin:12px 0 0;
  font-family:var(--dk-font-display);
  font-weight:700;
  font-size:clamp(26px,4.8vw,48px);
  line-height:1.08;
  letter-spacing:-.01em;
}
.page-about .ab-lede{
  margin:16px 0 0;
  max-width:40em;
  font-size:15px;
  line-height:1.8;
  color:var(--dk-ink);
}
.page-about .ab-head--ink .ab-head__title{color:var(--dk-paper);}
.page-about .ab-eyebrow--lime{color:var(--dk-lime);}

.page-about .ab-cols{
  display:grid;
  gap:var(--ab-gap);
}
.page-about .ab-prose p{
  margin:0 0 16px;
  font-size:16px;
  line-height:1.85;
  max-width:38em;
}
.page-about .ab-prose p:last-child{margin-bottom:0;}

/* ---------- 栏目面板 ---------- */
.page-about .ab-panel{
  border:var(--ab-line);
  background:var(--dk-paper);
  box-shadow:var(--dk-shadow);
  padding:clamp(16px,3vw,26px);
}
.page-about .ab-panel__title{
  margin:0 0 4px;
  font-family:var(--dk-font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--dk-teal);
}
.page-about .ab-index{list-style:none;margin:0;padding:0;}
.page-about .ab-index li{
  display:grid;
  grid-template-columns:auto 1fr;
  column-gap:12px;
  padding:12px 0;
  border-top:var(--ab-dash);
}
.page-about .ab-index li:first-child{border-top:0;padding-top:8px;}
.page-about .ab-index__num{
  grid-column:1;
  font-family:var(--dk-font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--dk-orange);
  padding-top:4px;
}
.page-about .ab-index__t{
  grid-column:2;
  font-family:var(--dk-font-display);
  font-weight:700;
  font-size:18px;
  letter-spacing:.02em;
}
.page-about .ab-index__d{
  grid-column:2;
  margin-top:4px;
  font-size:13.5px;
  line-height:1.65;
  color:var(--dk-slate);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline{
  list-style:none;
  margin:0;
  padding:0;
  position:relative;
}
.page-about .ab-timeline::before{
  content:"";
  position:absolute;
  left:9px;
  top:8px;
  bottom:8px;
  width:4px;
  background:var(--dk-ink);
}
.page-about .ab-tl{
  position:relative;
  padding:0 0 28px 40px;
  transition:transform var(--dk-ease);
}
.page-about .ab-tl:last-child{padding-bottom:0;}
.page-about .ab-tl__dot{
  position:absolute;
  left:0;
  top:4px;
  width:22px;
  height:22px;
  background:var(--dk-paper);
  border:3px solid var(--dk-ink);
  transition:background var(--dk-ease),border-color var(--dk-ease),transform var(--dk-ease);
}
.page-about .ab-tl:hover{transform:translateX(2px);}
.page-about .ab-tl:hover .ab-tl__dot{
  background:var(--dk-orange);
  border-color:var(--dk-orange);
  transform:rotate(45deg);
}
.page-about .ab-tl__year{
  margin:0;
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--dk-sand-deep);
}
.page-about .ab-tl__title{
  margin:8px 0 0;
  font-family:var(--dk-font-display);
  font-weight:700;
  font-size:20px;
  letter-spacing:.01em;
}
.page-about .ab-tl__text{
  margin:8px 0 0;
  font-size:14.5px;
  line-height:1.75;
  max-width:32em;
  color:var(--dk-ink);
}

/* ---------- 生产流程 ---------- */
.page-about .ab-flow{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:14px;
}
.page-about .ab-flow__item{
  border:var(--ab-line);
  background:var(--dk-paper);
  padding:18px;
  transition:box-shadow var(--dk-ease),transform var(--dk-ease),border-color var(--dk-ease);
}
.page-about .ab-flow__item:hover{
  transform:translate(-2px,-2px);
  box-shadow:var(--dk-shadow);
  border-color:var(--dk-orange);
}
.page-about .ab-flow__n{
  display:inline-block;
  padding:3px 8px;
  background:var(--dk-ink);
  color:var(--dk-paper);
  font-size:11px;
  letter-spacing:.14em;
}
.page-about .ab-flow__t{
  margin:12px 0 0;
  font-family:var(--dk-font-display);
  font-weight:700;
  font-size:20px;
}
.page-about .ab-flow__item p{
  margin:8px 0 0;
  font-size:14.5px;
  line-height:1.75;
  color:var(--dk-ink);
}

.page-about .ab-note{
  margin-top:clamp(22px,4vw,36px);
  border-left:6px solid var(--dk-orange);
  background:var(--dk-snow);
  padding:16px 18px;
  display:grid;
  gap:14px;
  align-items:center;
}
.page-about .ab-note__text{
  margin:0;
  font-size:14.5px;
  line-height:1.8;
}
.page-about .ab-note__link{justify-self:start;}

/* ---------- 图片 ---------- */
.page-about .ab-media{
  margin:0;
  border:var(--ab-line);
  background:var(--dk-snow);
  box-shadow:var(--dk-shadow);
  overflow:hidden;
}
.page-about .ab-media img{
  display:block;
  width:100%;
  height:auto;
  object-fit:cover;
}
.page-about .ab-media figcaption{
  border-top:var(--ab-line);
  background:var(--dk-paper);
  padding:9px 12px;
  font-family:var(--dk-font-mono);
  font-size:11.5px;
  line-height:1.6;
  letter-spacing:.02em;
  color:var(--dk-slate);
}

/* ---------- 数据带 ---------- */
.page-about .ab-stats{
  list-style:none;
  margin:clamp(26px,5vw,44px) 0 0;
  padding:0;
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:1px;
  background:var(--dk-ink);
  border:var(--ab-line);
  box-shadow:var(--dk-shadow);
}
.page-about .ab-stats li{
  background:var(--dk-paper);
  padding:16px 14px;
  transition:background var(--dk-ease);
}
.page-about .ab-stats li:hover{background:var(--dk-sand);}
.page-about .ab-stats__num{
  margin:0;
  font-family:var(--dk-font-display);
  font-weight:700;
  font-size:clamp(26px,6vw,46px);
  line-height:1;
  letter-spacing:-.02em;
}
.page-about .ab-stats__num small{
  font-family:var(--dk-font-body);
  font-size:.36em;
  font-weight:600;
  margin-left:2px;
  letter-spacing:0;
}
.page-about .ab-stats__label{
  margin:8px 0 0;
  font-size:12.5px;
  line-height:1.6;
  color:var(--dk-slate);
}

/* ---------- 合作网络 ---------- */
.page-about .ab-net{
  display:grid;
  gap:var(--ab-gap);
}
.page-about .ab-net__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:14px;
}
.page-about .ab-net__item{
  border:var(--ab-line);
  background:var(--dk-snow);
  padding:16px 18px;
  transition:box-shadow var(--dk-ease),transform var(--dk-ease);
}
.page-about .ab-net__item:hover{
  transform:translate(-2px,-2px);
  box-shadow:var(--dk-shadow);
}
.page-about .ab-net__num{
  display:block;
  font-size:13px;
  letter-spacing:.14em;
  color:var(--dk-sand-deep);
}
.page-about .ab-net__t{
  margin:6px 0 0;
  font-family:var(--dk-font-display);
  font-weight:700;
  font-size:21px;
}
.page-about .ab-net__item p{
  margin:8px 0 0;
  font-size:14.5px;
  line-height:1.75;
}

.page-about .ab-honor{
  margin-top:clamp(24px,4vw,40px);
  border:var(--ab-line);
  background:var(--dk-sand);
  padding:18px 20px;
  box-shadow:var(--dk-shadow-soft);
}
.page-about .ab-honor__t{
  margin:0 0 12px;
  font-family:var(--dk-font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--dk-sand-deep);
}
.page-about .ab-honor__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:10px;
}
.page-about .ab-honor__list li{
  position:relative;
  padding-left:20px;
  font-size:14.5px;
  line-height:1.7;
}
.page-about .ab-honor__list li::before{
  content:"";
  position:absolute;
  left:0;
  top:8px;
  width:10px;
  height:10px;
  background:var(--dk-teal);
}

/* ---------- 下一步 ---------- */
.page-about .ab-next{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:12px;
}
.page-about .ab-next__link{
  display:grid;
  gap:4px;
  padding:16px 18px;
  border:2px solid rgba(247,245,239,.55);
  color:var(--dk-paper);
  text-decoration:none;
  transition:background var(--dk-ease),color var(--dk-ease),border-color var(--dk-ease),transform var(--dk-ease);
}
.page-about .ab-next__link:hover,
.page-about .ab-next__link:focus-visible{
  background:var(--dk-orange);
  border-color:var(--dk-orange);
  color:var(--dk-ink);
  transform:translateX(4px);
}
.page-about .ab-next__link:focus-visible{
  outline:3px solid var(--dk-lime);
  outline-offset:3px;
}
.page-about .ab-next__label{
  font-family:var(--dk-font-display);
  font-weight:700;
  font-size:clamp(18px,3vw,23px);
  letter-spacing:.01em;
}
.page-about .ab-next__desc{
  font-size:13.5px;
  line-height:1.6;
  color:var(--dk-snow);
}
.page-about .ab-next__link:hover .ab-next__desc,
.page-about .ab-next__link:focus-visible .ab-next__desc{color:var(--dk-ink);}

.page-about .ab-contact{
  margin-top:clamp(26px,4vw,42px);
  border-top:2px solid rgba(247,245,239,.35);
  padding-top:22px;
}
.page-about .ab-contact__lead{
  margin:0 0 14px;
  font-size:14.5px;
  color:var(--dk-snow);
}
.page-about .ab-contact__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:10px;
}
.page-about .ab-contact__list li{
  display:flex;
  flex-wrap:wrap;
  gap:6px 14px;
  align-items:baseline;
  font-size:14px;
}
.page-about .ab-contact__list span{
  min-width:72px;
  font-size:11px;
  letter-spacing:.12em;
  color:var(--dk-lime);
}
.page-about .ab-contact__list a{
  color:var(--dk-paper);
  text-decoration:none;
  border-bottom:2px solid rgba(182,255,59,.6);
  word-break:break-all;
  transition:color var(--dk-ease),border-color var(--dk-ease);
}
.page-about .ab-contact__list a:hover,
.page-about .ab-contact__list a:focus-visible{
  color:var(--dk-lime);
  border-color:var(--dk-lime);
}

/* ---------- 断点 ---------- */
@media (min-width:640px){
  .page-about .ab-flow{grid-template-columns:repeat(2,1fr);}
  .page-about .ab-flow__item:first-child{grid-column:1 / -1;}
  .page-about .ab-note{grid-template-columns:1fr auto;}
  .page-about .ab-note__link{justify-self:end;}
  .page-about .ab-stats{grid-template-columns:repeat(4,1fr);}
  .page-about .ab-net__list{grid-template-columns:repeat(3,1fr);}
  .page-about .ab-next{grid-template-columns:repeat(2,1fr);}
  .page-about .ab-contact__list{grid-template-columns:repeat(2,1fr);}
}

@media (min-width:900px){
  .page-about .ab-hero{padding-bottom:clamp(48px,6vw,84px);}
  .page-about .ab-hero__deco{height:170px;}
  .page-about .ab-hero__grid{
    grid-template-columns:minmax(0,7fr) minmax(240px,4fr);
    align-items:start;
    gap:clamp(30px,5vw,64px);
  }
  .page-about .ab-toc{margin-top:26px;}
  .page-about .ab-cols{grid-template-columns:minmax(0,7fr) minmax(0,5fr);align-items:start;}
  .page-about .ab-cols--flip{grid-template-columns:minmax(0,5fr) minmax(0,7fr);}
  .page-about .ab-cols--wide-right{grid-template-columns:minmax(0,6fr) minmax(0,6fr);}
  .page-about .ab-timeline{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:clamp(16px,2.5vw,28px);
  }
  .page-about .ab-timeline::before{
    left:0;right:0;top:9px;bottom:auto;
    width:auto;height:4px;
  }
  .page-about .ab-tl{padding:40px 0 0;}
  .page-about .ab-tl__dot{top:0;}
  .page-about .ab-tl:hover{transform:translateY(-2px);}
  .page-about .ab-flow{grid-template-columns:repeat(3,1fr);}
  .page-about .ab-flow__item:first-child{grid-column:auto;}
  .page-about .ab-net{grid-template-columns:minmax(0,5fr) minmax(0,7fr);align-items:start;}
  .page-about .ab-media--wide{margin-top:8px;}
  .page-about .ab-next{grid-template-columns:repeat(4,1fr);}
  .page-about .ab-contact__list{grid-template-columns:repeat(3,1fr);}
}

@media (min-width:1100px){
  .page-about .ab-hero__grid{grid-template-columns:minmax(0,8fr) minmax(260px,4fr);}
  .page-about .ab-media--tall img{min-height:340px;}
}

@media (prefers-reduced-motion:reduce){
  .page-about .ab-tl,
  .page-about .ab-tl__dot,
  .page-about .ab-flow__item,
  .page-about .ab-net__item,
  .page-about .ab-next__link,
  .page-about .ab-toc__link{transition:none;}
  .page-about .ab-tl:hover,
  .page-about .ab-flow__item:hover,
  .page-about .ab-net__item:hover,
  .page-about .ab-next__link:hover{transform:none;}
  .page-about .ab-tl:hover .ab-tl__dot{transform:none;}
}
<<<END>>>