.page-about{
  --ab-cut:14px;
  --ab-edge:rgba(122,92,34,.45);
  --ab-edge-soft:rgba(122,92,34,.24);
  --ab-tint:rgba(16,39,61,.55);
  --ab-cjk:760px;
  color:var(--paper);
  background:var(--deep);
  font-family:var(--sans);
  overflow-x:hidden;
}

/* ---------- 通用块 ---------- */
.page-about .ab-sec{
  padding:56px 0;
  border-top:1px solid var(--ab-edge-soft);
}
.page-about .ab-sec--tint{
  background:linear-gradient(180deg, rgba(16,39,61,.72), rgba(10,27,46,.2));
}
.page-about .ab-sec__head{
  max-width:var(--ab-cjk);
  margin-bottom:32px;
}
.page-about .ab-sec__head h2{
  margin:12px 0 12px;
  font-size:clamp(23px,5.4vw,34px);
  line-height:1.3;
  letter-spacing:.06em;
  font-weight:900;
  color:var(--paper);
}
.page-about .ab-sec__intro{
  margin:0;
  max-width:var(--ab-cjk);
  color:var(--mist);
  font-size:16px;
  line-height:1.78;
}
.page-about .eyebrow{
  margin:0;
  letter-spacing:.14em;
}
.page-about .note{
  color:var(--mist);
  font-size:14px;
  line-height:1.7;
}
.page-about .lead{
  font-size:17px;
  line-height:1.85;
  color:var(--paper);
  max-width:60ch;
}
.page-about .ab-divider{
  height:1px;
  background:linear-gradient(90deg, transparent, var(--gold) 18%, var(--edge) 60%, transparent);
  position:relative;
}
.page-about .ab-divider::after{
  content:"";
  position:absolute;
  left:18%;
  top:-3px;
  width:7px;
  height:7px;
  background:var(--copper);
  transform:rotate(45deg);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero{
  position:relative;
  padding:20px 0 52px;
  background:
    radial-gradient(120% 96% at 84% 2%, rgba(227,180,87,.18), transparent 58%),
    radial-gradient(96% 80% at 6% 0%, rgba(111,168,147,.16), transparent 62%),
    var(--deep);
}
.page-about .ab-hero .breadcrumb{
  margin:0 0 26px;
  font-size:13px;
  color:var(--mist);
}
.page-about .ab-hero__grid{
  display:grid;
  gap:32px;
}
.page-about .ab-hero__lead h1{
  margin:14px 0 16px;
  font-size:clamp(29px,7.4vw,54px);
  line-height:1.22;
  letter-spacing:.05em;
  font-weight:900;
  color:var(--paper);
  text-wrap:balance;
}
.page-about .ab-hero__lead h1::after{
  content:"";
  display:block;
  width:78px;
  height:3px;
  margin-top:20px;
  background:linear-gradient(90deg, var(--gold), var(--copper));
}

.page-about .ab-claims{
  margin-top:32px;
  display:grid;
  gap:1px;
  background:var(--ab-edge-soft);
  border-top:1px solid var(--ab-edge);
  border-bottom:1px solid var(--ab-edge);
}
.page-about .ab-claims__row{
  display:grid;
  grid-template-columns:44px minmax(0,1fr);
  gap:14px;
  padding:16px 4px;
  background:rgba(10,27,46,.86);
}
.page-about .ab-claims__num{
  margin:2px 0 0;
  font-size:15px;
  color:var(--gold);
  letter-spacing:.08em;
}
.page-about .ab-claims__title{
  margin:0 0 6px;
  font-size:17px;
  letter-spacing:.06em;
  color:var(--gold-hi);
}
.page-about .ab-claims__text{
  margin:0;
  font-size:15px;
  line-height:1.75;
  color:var(--paper);
}

.page-about .ab-fig{
  position:relative;
  overflow:hidden;
  background:var(--panel);
  clip-path:polygon(var(--ab-cut) 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%, 0 var(--ab-cut));
}
.page-about .ab-fig img{
  display:block;
  width:100%;
  max-width:100%;
  height:auto;
  object-fit:cover;
}
.page-about .ab-fig--hero img{
  aspect-ratio:14 / 8;
}
.page-about figure{
  margin:0;
}
.page-about figcaption{
  margin-top:12px;
  font-size:13px;
  line-height:1.7;
  color:var(--mist);
  max-width:52ch;
}

/* ---------- 时间线 ---------- */
.page-about .ab-years{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:0 0 30px;
}
.page-about .ab-years a{
  display:inline-block;
  padding:6px 12px;
  font-size:14px;
  letter-spacing:.06em;
  color:var(--gold);
  text-decoration:none;
  border:1px solid var(--ab-edge);
  background:rgba(16,39,61,.7);
  clip-path:polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}
.page-about .ab-years a:hover,
.page-about .ab-years a:focus-visible{
  color:var(--deep);
  background:var(--gold);
  border-color:var(--gold-hi);
  outline:none;
}

.page-about .ab-tl{
  list-style:none;
  margin:0;
  padding:0;
  position:relative;
}
.page-about .ab-tl::before{
  content:"";
  position:absolute;
  left:9px;
  top:8px;
  bottom:8px;
  width:1px;
  background:linear-gradient(180deg, rgba(227,180,87,.7), rgba(122,92,34,.18));
}
.page-about .ab-tl__item{
  position:relative;
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:8px;
  padding:0 0 34px 30px;
}
.page-about .ab-tl__item::before{
  content:"";
  position:absolute;
  left:5px;
  top:6px;
  width:9px;
  height:9px;
  background:var(--copper);
  transform:rotate(45deg);
}
.page-about .ab-tl__year{
  margin:0;
  font-size:18px;
  letter-spacing:.1em;
  color:var(--gold);
}
.page-about .ab-tl__body h3{
  margin:0 0 8px;
  font-size:19px;
  line-height:1.4;
  letter-spacing:.04em;
  font-weight:800;
  color:var(--paper);
}
.page-about .ab-tl__body p{
  margin:0;
  font-size:15px;
  line-height:1.78;
  color:var(--paper);
  max-width:58ch;
}
.page-about .ab-tl__aside{
  margin:0;
  padding:10px 12px;
  font-size:13px;
  line-height:1.7;
  color:var(--mist);
  border-left:2px solid var(--copper);
  background:rgba(16,39,61,.66);
  transition:opacity .3s var(--ease), color .3s var(--ease);
}
.page-about .ab-tl__item:hover .ab-tl__aside,
.page-about .ab-tl__item:focus-within .ab-tl__aside{
  color:var(--paper);
  border-left-color:var(--gold);
}

/* ---------- 复核机制 ---------- */
.page-about .ab-review__grid{
  display:grid;
  gap:32px;
}
.page-about .ab-rules{
  display:grid;
  gap:14px;
}
.page-about .ab-rule{
  display:grid;
  grid-template-columns:44px minmax(0,1fr);
  gap:14px;
  padding:18px;
  background:rgba(16,39,61,.78);
  border-left:2px solid var(--gold);
  clip-path:polygon(var(--ab-cut) 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%, 0 var(--ab-cut));
}
.page-about .ab-rule__num{
  margin:2px 0 0;
  font-size:16px;
  color:var(--gold);
  letter-spacing:.08em;
}
.page-about .ab-rule__body h3{
  margin:0 0 8px;
  font-size:17px;
  letter-spacing:.05em;
  font-weight:800;
  color:var(--gold-hi);
}
.page-about .ab-rule__body p{
  margin:0 0 8px;
  font-size:15px;
  line-height:1.78;
  color:var(--paper);
}
.page-about .ab-rule__body p:last-child{
  margin-bottom:0;
}

.page-about .ab-lanes{
  margin-top:36px;
}
.page-about .ab-lanes__scroll{
  display:grid;
  grid-auto-flow:column;
  grid-auto-columns:minmax(250px, 1fr);
  gap:12px;
  overflow-x:auto;
  padding-bottom:10px;
  scroll-snap-type:x mandatory;
  -webkit-overflow-scrolling:touch;
}
.page-about .ab-lane{
  scroll-snap-align:start;
  padding:18px;
  background:rgba(10,27,46,.9);
  border-top:2px solid var(--gold);
  clip-path:polygon(0 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%);
}
.page-about .ab-lane--net{ border-top-color:var(--jade); }
.page-about .ab-lane--faq{ border-top-color:var(--copper); }
.page-about .ab-lane h3{
  margin:0 0 8px;
  font-size:17px;
  letter-spacing:.05em;
  color:var(--paper);
}
.page-about .ab-lane p{
  margin:0 0 12px;
  font-size:14px;
  line-height:1.75;
  color:var(--mist);
}
.page-about .ab-lane ul{
  margin:0;
  padding:0;
  list-style:none;
  display:grid;
  gap:8px;
}
.page-about .ab-lane li{
  position:relative;
  padding-left:14px;
  font-size:14px;
  line-height:1.7;
  color:var(--paper);
}
.page-about .ab-lane li::before{
  content:"";
  position:absolute;
  left:0;
  top:9px;
  width:6px;
  height:1px;
  background:var(--gold);
}
.page-about .ab-lanes__hint{
  margin:8px 0 0;
  font-size:12px;
  letter-spacing:.08em;
  color:var(--mist);
}

/* ---------- 区域分层 ---------- */
.page-about .ab-zones{
  display:grid;
  gap:32px;
}
.page-about .ab-zones__text{
  display:grid;
  gap:16px;
}
.page-about .ab-zone{
  padding:18px;
  background:rgba(16,39,61,.6);
  border-bottom:1px solid var(--ab-edge-soft);
}
.page-about .ab-zone h3{
  margin:0 0 8px;
  font-size:18px;
  letter-spacing:.05em;
  font-weight:800;
  color:var(--paper);
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:10px;
}
.page-about .ab-zone__idx{
  font-size:13px;
  letter-spacing:.1em;
  color:var(--jade);
}
.page-about .ab-zone p{
  margin:0;
  font-size:15px;
  line-height:1.78;
  color:var(--paper);
  max-width:58ch;
}

/* ---------- 协作生态 ---------- */
.page-about .ab-alliance{
  display:grid;
  gap:14px;
}
.page-about .ab-card{
  position:relative;
  padding:20px 18px 18px;
  background:linear-gradient(160deg, rgba(16,39,61,.96), rgba(10,27,46,.96));
  clip-path:polygon(var(--ab-cut) 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%, 0 var(--ab-cut));
}
.page-about .ab-card::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:56px;
  height:2px;
  background:linear-gradient(90deg, var(--gold), var(--copper));
}
.page-about .ab-alliance__num{
  margin:0 0 10px;
  font-size:34px;
  line-height:1;
  letter-spacing:.04em;
  color:var(--gold);
}
.page-about .ab-alliance__card h3{
  margin:0 0 8px;
  font-size:17px;
  letter-spacing:.05em;
  font-weight:800;
  color:var(--paper);
}
.page-about .ab-alliance__card p{
  margin:0 0 10px;
  font-size:15px;
  line-height:1.78;
  color:var(--paper);
}
.page-about .ab-alliance__card p:last-child{
  margin-bottom:0;
}

/* ---------- 资质与量级 ---------- */
.page-about .ab-facts{
  display:grid;
  gap:1px;
  background:var(--ab-edge-soft);
  border-top:1px solid var(--ab-edge);
  border-bottom:1px solid var(--ab-edge);
}
.page-about .ab-fact{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:6px;
  padding:16px 4px;
  background:rgba(10,27,46,.88);
}
.page-about .ab-fact__key{
  margin:0;
  font-size:16px;
  letter-spacing:.08em;
  color:var(--gold);
}
.page-about .ab-fact__val{
  margin:0;
  font-size:15px;
  line-height:1.78;
  color:var(--paper);
  max-width:62ch;
}

.page-about .ab-caveat{
  margin:24px 0 0;
  padding:14px 16px;
  font-size:14px;
  line-height:1.75;
  color:var(--mist);
  border-left:2px solid var(--copper);
  background:rgba(16,39,61,.6);
}

.page-about .ab-next{
  margin-top:36px;
  padding-top:24px;
  border-top:1px solid var(--ab-edge-soft);
}
.page-about .ab-next__lead{
  margin:0 0 14px;
  font-size:14px;
  letter-spacing:.1em;
  color:var(--mist);
}
.page-about .ab-next__links{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}
.page-about .ab-next__links .btn{
  text-decoration:none;
  white-space:nowrap;
}

/* ---------- 中屏 ---------- */
@media (min-width:700px){
  .page-about .ab-claims__row{
    grid-template-columns:56px minmax(0,1fr);
    padding:18px 6px;
  }
  .page-about .ab-fact{
    grid-template-columns:150px minmax(0,1fr);
    gap:18px;
    align-items:baseline;
    padding:18px 6px;
  }
  .page-about .ab-tl__item{
    grid-template-columns:96px minmax(0,1fr);
    grid-template-areas:
      "year body"
      "year aside";
    gap:10px 24px;
    padding:0 0 40px 0;
  }
  .page-about .ab-tl__year{ grid-area:year; }
  .page-about .ab-tl__body{ grid-area:body; }
  .page-about .ab-tl__aside{ grid-area:aside; }
  .page-about .ab-tl::before{ left:47px; }
  .page-about .ab-tl__item::before{ left:43px; top:9px; }
}

/* ---------- 桌面 ---------- */
@media (min-width:1024px){
  .page-about .ab-sec{ padding:88px 0; }
  .page-about .ab-hero{ padding:32px 0 76px; }

  .page-about .ab-hero__grid{
    grid-template-columns:minmax(0,1fr) minmax(0,.62fr);
    gap:52px;
    align-items:start;
  }
  .page-about .ab-hero__figure{
    margin-top:56px;
  }

  .page-about .ab-review__grid{
    grid-template-columns:minmax(0,1.05fr) minmax(0,.78fr);
    gap:44px;
    align-items:start;
  }
  .page-about .ab-review__fig{
    position:sticky;
    top:110px;
  }

  .page-about .ab-lanes__scroll{
    grid-auto-flow:row;
    grid-template-columns:repeat(3, minmax(0,1fr));
    overflow-x:visible;
    gap:14px;
    padding-bottom:0;
  }
  .page-about .ab-lanes__hint{ display:none; }

  .page-about .ab-zones{
    grid-template-columns:minmax(0,1.02fr) minmax(0,.8fr);
    gap:44px;
    align-items:start;
  }
  .page-about .ab-zones__fig{
    position:sticky;
    top:110px;
  }

  .page-about .ab-alliance{
    grid-template-columns:repeat(3, minmax(0,1fr));
    gap:16px;
  }
  .page-about .ab-alliance__card:nth-child(2){ margin-top:16px; }
  .page-about .ab-alliance__card:nth-child(3){ margin-top:32px; }
}

@media (min-width:1240px){
  .page-about .ab-tl__item{
    grid-template-columns:96px minmax(0,1fr) 268px;
    grid-template-areas:"year .page-about aside";
    gap:0 30px;
    align-items:start;
  }
  .page-about .ab-tl__aside{ margin-top:2px; }
}

@media (prefers-reduced-motion:reduce){
  .page-about .ab-years a,
  .page-about .ab-tl__aside,
  .page-about .ab-divider::after{
    transition:none;
  }
}