.page-about{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  -webkit-font-smoothing:antialiased;
}
.page-about *{box-sizing:border-box;}

/* 面包屑 */
.page-about .crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px;
  margin:0 0 clamp(18px,3vw,30px);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--fog);
}
.page-about .crumbs a{color:var(--fog);text-decoration:none;transition:color .2s var(--ease);}
.page-about .crumbs a:hover{color:var(--blue);}
.page-about .crumbs__sep{color:var(--khaki);}

/* 首屏 */
.ab-hero{
  position:relative;
  overflow:hidden;
  padding:18px 0 clamp(34px,5vw,62px);
}
.ab-hero::before{
  content:"";
  position:absolute;
  z-index:0;
  top:-130px;
  right:-14%;
  width:min(620px,88vw);
  height:min(620px,88vw);
  background:var(--blue);
  opacity:.08;
  border-radius:var(--r-xl);
  transform:rotate(16deg);
}
.ab-hero::after{
  content:"";
  position:absolute;
  z-index:0;
  left:-90px;
  bottom:-150px;
  width:300px;
  height:300px;
  background:var(--amber);
  opacity:.12;
  border-radius:50%;
}
.ab-hero > .wrap{position:relative;z-index:1;}
.ab-hero__inner{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(22px,4vw,42px);
  align-items:start;
}
.ab-hero__eyebrow{margin:0;color:var(--fog);}
.ab-hero h1{
  margin:12px 0 0;
  font-size:clamp(30px,5.2vw,54px);
  line-height:1.14;
  letter-spacing:-.02em;
  font-weight:800;
  max-width:17em;
}
.ab-hero__lead{
  margin:clamp(16px,2.4vw,22px) 0 0;
  max-width:44em;
  font-size:clamp(15px,1.6vw,16.5px);
  line-height:1.8;
  color:var(--brown);
}
.ab-hero__acts{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:clamp(22px,3vw,30px);
}
.ab-hero__panel{
  position:relative;
  overflow:hidden;
  background:var(--ink);
  color:var(--paper);
  border-radius:var(--r-xl);
  padding:clamp(22px,3.4vw,34px);
}
.ab-hero__panel::before{
  content:"";
  position:absolute;
  right:-60px;
  bottom:-80px;
  width:200px;
  height:200px;
  background:var(--blue);
  border-radius:50%;
  opacity:.26;
}
.ab-hero__ver{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin:0 0 18px;
  padding:6px 14px;
  background:var(--orange);
  color:var(--ink);
  border-radius:var(--r-pill);
  font-size:12px;
  letter-spacing:.08em;
}
.ab-hero__ver .mono{font-size:14px;font-weight:700;letter-spacing:0;}
.ab-hero__stats{
  position:relative;
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:16px;
}
.ab-hero__stats li{
  display:flex;
  align-items:baseline;
  gap:12px;
  padding-top:14px;
  border-top:1px solid rgba(244,238,226,.18);
}
.ab-hero__stats li:first-child{padding-top:0;border-top:0;}
.ab-hero__num{
  flex:0 0 auto;
  font-size:clamp(26px,3.4vw,34px);
  line-height:1;
  letter-spacing:-.03em;
  color:var(--mint);
}
.ab-hero__cap{
  font-size:13px;
  line-height:1.6;
  color:rgba(244,238,226,.74);
}

/* 主体骨架 */
.ab-shell{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(20px,3vw,44px);
  padding-bottom:clamp(36px,5vw,70px);
}

/* 章节竖排索引 */
.ab-index{display:none;}

/* 章节 */
.ab-sec{
  padding-block:clamp(26px,4vw,46px);
  border-top:1px solid var(--khaki);
}
.ab-sec:first-child{border-top:0;padding-top:0;}
.ab-sec__head{
  display:flex;
  align-items:baseline;
  gap:clamp(10px,2vw,18px);
  margin-bottom:clamp(16px,2.6vw,26px);
}
.ab-sec__num{
  flex:0 0 auto;
  font-size:clamp(30px,4.4vw,46px);
  line-height:1;
  letter-spacing:-.05em;
  color:var(--blue);
}
.ab-sec__head h2{
  margin:0;
  font-size:clamp(20px,2.6vw,28px);
  line-height:1.3;
  letter-spacing:-.01em;
  font-weight:800;
  max-width:20em;
}
.ab-sec__body p{
  margin:0 0 14px;
  max-width:44em;
  font-size:15.5px;
  line-height:1.8;
  color:var(--ink-2);
}
.ab-sec__body p:last-child{margin-bottom:0;}
.ab-sec__lead{
  margin:0 0 clamp(16px,2.6vw,24px);
  max-width:44em;
  font-size:15px;
  line-height:1.8;
  color:var(--brown);
}
.ab-quote{
  margin:24px 0 0;
  padding:12px 0 12px 18px;
  border-left:3px solid var(--orange);
  max-width:34em;
  font-size:clamp(16px,2vw,19px);
  line-height:1.7;
  font-weight:600;
  color:var(--brown);
}

/* 图片框 */
.page-about .media-frame{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  border-radius:var(--r-lg);
  background:var(--paper-2);
}
.page-about .media-frame__img{
  display:block;
  width:100%;
  max-width:100%;
  height:100%;
  object-fit:cover;
}

/* 时间轴 */
.ab-tl-fig{margin:0 0 18px;}
.ab-tl-fig .media-frame{aspect-ratio:1400/600;}
.ab-tl-fig__cap{
  margin:10px 0 0;
  font-size:12px;
  letter-spacing:.04em;
  color:var(--fog);
}
.ab-tl__line{
  display:block;
  width:100%;
  height:32px;
  margin:0 0 8px;
  color:var(--orange);
}
.ab-tl{
  list-style:none;
  margin:0;
  padding:0 0 12px;
  display:flex;
  gap:14px;
  overflow-x:auto;
  scroll-snap-type:x proximity;
  -webkit-overflow-scrolling:touch;
}
.ab-tl__node{
  flex:0 0 clamp(228px,64vw,282px);
  scroll-snap-align:start;
  padding:18px 18px 20px;
  background:var(--white);
  border:1px solid var(--khaki);
  border-radius:var(--r-lg);
  transition:transform .24s var(--ease),border-color .24s var(--ease);
}
.ab-tl__node:hover{
  transform:translateY(-4px);
  border-color:var(--orange);
}
.ab-tl__ver{
  display:inline-block;
  padding:3px 10px;
  border-radius:var(--r-pill);
  background:rgba(36,87,230,.1);
  color:var(--blue);
  font-size:13px;
  font-weight:700;
  letter-spacing:0;
}
.ab-tl__h{
  margin:12px 0 8px;
  font-size:17px;
  line-height:1.35;
  font-weight:800;
  color:var(--ink);
}
.ab-tl__p{
  margin:0;
  font-size:14px;
  line-height:1.7;
  color:var(--brown);
}
.ab-tl__tags{
  list-style:none;
  margin:14px 0 0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:6px;
}
.ab-chip{
  display:inline-block;
  padding:3px 10px;
  border-radius:var(--r-pill);
  background:var(--amber);
  color:var(--ink);
  font-size:11px;
  line-height:1.5;
  letter-spacing:.04em;
}

/* 团队 */
.ab-team{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(20px,3vw,30px);
  align-items:start;
}
.ab-team__fig{margin:0;}
.ab-team__fig .media-frame{aspect-ratio:1200/800;}
.ab-team__cap{
  margin:10px 0 0;
  font-size:12px;
  line-height:1.6;
  color:var(--fog);
}
.ab-team__text p{
  margin:0 0 16px;
  font-size:15px;
  line-height:1.8;
  color:var(--ink-2);
}
.ab-team__note{
  margin:0;
  font-size:14px;
  line-height:1.8;
  color:var(--brown);
}
.ab-roles{
  list-style:none;
  margin:0 0 16px;
  padding:0;
}
.ab-roles__i{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:14px;
  padding:14px 0;
  border-top:1px solid var(--khaki);
}
.ab-roles__i:first-child{border-top:0;padding-top:0;}
.ab-roles__n{
  font-size:clamp(22px,2.8vw,28px);
  line-height:1;
  letter-spacing:-.03em;
  color:var(--blue);
}
.ab-roles__d h3{
  margin:0 0 6px;
  font-size:15.5px;
  line-height:1.4;
  font-weight:800;
  color:var(--ink);
}
.ab-roles__d p{
  margin:0;
  font-size:13.5px;
  line-height:1.7;
  color:var(--fog);
}

/* 服务条目手风琴 */
.ab-svc-list{
  border-radius:var(--r-md);
}
.ab-svc{
  margin-bottom:10px;
  background:var(--white);
  border:1px solid var(--khaki);
  border-radius:var(--r-md);
  overflow:hidden;
}
.ab-svc__sum{
  display:flex;
  align-items:center;
  gap:12px;
  padding:14px 16px;
  font-size:16px;
  font-weight:700;
  color:var(--ink);
  cursor:pointer;
  list-style:none;
}
.ab-svc__sum::-webkit-details-marker{display:none;}
.ab-svc__sum::after{
  content:"+";
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:18px;
  line-height:1;
  color:var(--blue);
}
.ab-svc[open] .ab-svc__sum::after{content:"–";}
.ab-svc[open] .ab-svc__sum{border-bottom:1px solid var(--khaki);}
.ab-svc__sum:focus-visible{
  outline:2px solid var(--orange);
  outline-offset:-2px;
}
.ab-svc__n{
  flex:0 0 auto;
  padding:2px 8px;
  border-radius:var(--r-pill);
  background:var(--blue);
  color:var(--white);
  font-size:12px;
  letter-spacing:0;
}
.ab-svc__t{white-space:nowrap;}
.ab-svc__hint{
  margin-left:6px;
  font-size:12px;
  font-weight:400;
  color:var(--fog);
}
.ab-svc__items{
  list-style:none;
  margin:0;
  padding:16px;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}
.ab-svc__items li{
  padding:6px 12px;
  border:1px solid var(--khaki);
  border-radius:var(--r-pill);
  background:var(--paper);
  font-size:13px;
  line-height:1.5;
  color:var(--brown);
}

/* 资质与生态 */
.ab-trust{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(20px,3vw,28px);
  align-items:start;
}
.ab-trust__fig{margin:0;}
.ab-trust__fig .media-frame{aspect-ratio:1/1;}
.ab-trust__cols{
  display:grid;
  grid-template-columns:1fr;
  gap:20px;
}
.ab-trust__col h3{
  margin:0 0 12px;
  font-size:16px;
  font-weight:800;
  letter-spacing:.02em;
  color:var(--ink);
}
.ab-trust__col ul{
  list-style:none;
  margin:0 0 12px;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:10px;
}
.ab-trust__col li{
  position:relative;
  padding-left:14px;
  font-size:14px;
  line-height:1.65;
  color:var(--ink-2);
}
.ab-trust__col li::before{
  content:"";
  position:absolute;
  left:0;
  top:.58em;
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--mint);
}
.ab-trust__col li .mono{
  margin-right:6px;
  color:var(--blue);
  font-weight:700;
  letter-spacing:0;
}
.ab-trust__col p{
  margin:0;
  font-size:14px;
  line-height:1.8;
  color:var(--brown);
}

/* 覆盖数据带 */
.ab-band{
  position:relative;
  overflow:hidden;
  padding:clamp(20px,3vw,30px);
  background:var(--ink);
  border-radius:var(--r-xl);
  color:var(--paper);
}
.ab-band__dot{
  position:absolute;
  top:16px;
  right:18px;
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--mint);
  box-shadow:0 0 0 6px rgba(43,232,176,.16);
}
.ab-band__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(118px,1fr));
  gap:18px;
}
.ab-band__list li{
  display:flex;
  flex-direction:column;
  gap:6px;
}
.ab-band__list .mono{
  font-size:clamp(22px,3vw,30px);
  line-height:1;
  letter-spacing:-.03em;
  color:var(--white);
}
.ab-band__list .mono + span{
  font-size:12.5px;
  letter-spacing:.04em;
  color:rgba(244,238,226,.72);
}

/* 下一步 */
.ab-next{
  border-top:1px solid var(--khaki);
  padding:clamp(30px,5vw,54px) 0 clamp(40px,6vw,70px);
}
.ab-next .label{color:var(--fog);}
.ab-next h2{
  margin:8px 0 clamp(18px,3vw,26px);
  font-size:clamp(22px,3vw,30px);
  line-height:1.3;
  letter-spacing:-.01em;
  font-weight:800;
}
.ab-next__grid{
  display:grid;
  grid-template-columns:1fr;
  gap:12px;
}
.ab-next__card{
  display:flex;
  flex-direction:column;
  gap:8px;
  padding:18px;
  background:var(--white);
  border:1px solid var(--khaki);
  border-radius:var(--r-md);
  color:var(--ink);
  text-decoration:none;
  transition:transform .24s var(--ease),border-color .24s var(--ease);
}
.ab-next__card:hover{
  transform:translateY(-4px);
  border-color:var(--orange);
}
.ab-next__card .mono{
  font-size:12px;
  letter-spacing:0;
  color:var(--orange);
}
.ab-next__card h3{
  margin:0;
  font-size:16px;
  line-height:1.4;
  font-weight:800;
}
.ab-next__card p{
  margin:0;
  font-size:13px;
  line-height:1.65;
  color:var(--fog);
}

/* 响应式 */
@media (max-width:639px){
  .ab-svc__hint{display:none;}
  .ab-hero__stats li{flex-direction:column;gap:6px;align-items:flex-start;}
}

@media (min-width:640px){
  .ab-next__grid{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (min-width:720px){
  .ab-trust__cols{grid-template-columns:1fr 1fr;gap:0;}
  .ab-trust__col{padding:0 20px;}
  .ab-trust__col:first-child{padding-left:0;}
  .ab-trust__col + .ab-trust__col{border-left:1px solid var(--khaki);}
}

@media (min-width:820px){
  .ab-team{grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);}
}

@media (min-width:900px){
  .ab-hero__inner{grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);}
  .ab-trust{grid-template-columns:232px minmax(0,1fr);}
}

@media (min-width:1024px){
  .ab-next__grid{grid-template-columns:repeat(4,minmax(0,1fr));}
}

@media (min-width:1080px){
  .ab-shell{
    grid-template-columns:108px minmax(0,1fr);
    gap:clamp(24px,3vw,52px);
  }
  .ab-index{
    display:block;
    position:sticky;
    top:calc(var(--head-h) + 16px);
    align-self:start;
  }
  .ab-index__cap{
    margin:0 0 14px;
    color:var(--fog);
  }
  .ab-index__list{
    list-style:none;
    margin:0;
    padding:0;
    display:flex;
    flex-direction:column;
    gap:14px;
  }
  .ab-index__list a{
    display:inline-flex;
    align-items:flex-start;
    gap:6px;
    writing-mode:vertical-rl;
    font-size:12px;
    letter-spacing:.14em;
    color:var(--fog);
    text-decoration:none;
    transition:color .2s var(--ease);
  }
  .ab-index__list a .mono{
    font-size:11px;
    letter-spacing:0;
    color:var(--orange);
  }
  .ab-index__list a:hover,
  .ab-index__list a:focus-visible{color:var(--blue);}
}

@media (prefers-reduced-motion:reduce){
  .page-about *{transition:none !important;animation:none !important;}
  .ab-tl{scroll-behavior:auto;}
}