/* ===== 品牌中心 · page-about ===== */
.page-about{
  --ab-cut:18px;
  --ab-paper-ink:#2c3835;
  --ab-paper-dim:#5a6663;
  --ab-gold-on-paper:#8a6512;
  background:var(--ink);
  color:var(--on-dark);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  padding:calc(var(--header-h) + 22px) 0 clamp(52px,7.5vw,104px);
  background:
    radial-gradient(115% 85% at 6% 0%, rgba(18,76,60,.95) 0%, rgba(11,59,46,0) 62%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-deep) 100%);
}

.page-about .ab-hero__media{
  position:absolute;
  inset:0;
  z-index:-1;
}

.page-about .ab-hero__img{
  width:100%;
  height:100%;
  max-width:none;
  object-fit:cover;
  object-position:center 32%;
  filter:saturate(.62) contrast(1.1);
  opacity:.26;
}

.page-about .ab-hero__frame{
  position:relative;
  width:min(calc(100% - 2 * var(--gutter)), var(--maxw));
  margin-inline:auto;
  padding:clamp(24px,4vw,50px) clamp(20px,3.6vw,48px) clamp(26px,4vw,52px);
  border-left:2px solid var(--amber);
  background:linear-gradient(180deg, rgba(6,35,27,.62) 0%, rgba(6,35,27,.26) 100%);
  clip-path:polygon(0 0, calc(100% - var(--ab-cut)) 0, 100% var(--ab-cut), 100% 100%, 0 100%);
}

.page-about .ab-hero__frame::after{
  content:"";
  position:absolute;
  top:0;
  right:0;
  width:64px;
  height:1px;
  background:var(--amber);
}

.page-about .ab-hero__eyebrow{
  margin:clamp(18px,3vw,30px) 0 0;
  color:var(--amber);
}

.page-about .ab-hero__title{
  margin:clamp(14px,2.2vw,26px) 0 0;
  max-width:9.4em;
  font-size:clamp(34px,7.6vw,92px);
  font-weight:900;
  line-height:.98;
  letter-spacing:-.02em;
  color:var(--paper);
}

.page-about .ab-hero__line{
  display:block;
  animation:abRise .68s var(--ease) both;
}

.page-about .ab-hero__line:nth-child(2){
  animation-delay:.1s;
  color:var(--amber-soft);
}

@keyframes abRise{
  from{opacity:0;transform:translateY(20px);}
  to{opacity:1;transform:none;}
}

.page-about .ab-hero__lede{
  margin:clamp(18px,2.4vw,28px) 0 0;
  max-width:34em;
  font-size:clamp(15.5px,1.5vw,18px);
  line-height:1.8;
  color:var(--on-dark);
}

.page-about .ab-hero__facts{
  display:flex;
  flex-wrap:wrap;
  gap:12px clamp(16px,3vw,40px);
  margin:clamp(26px,3.6vw,44px) 0 0;
  padding:0;
  list-style:none;
}

.page-about .ab-fact{
  display:flex;
  align-items:baseline;
  gap:8px;
  padding-left:12px;
  border-left:1px solid var(--line);
}

.page-about .ab-fact__num{
  font-size:clamp(21px,2.5vw,30px);
  font-weight:700;
  color:var(--amber-soft);
  letter-spacing:-.01em;
}

.page-about .ab-fact__label{
  font-size:13px;
  letter-spacing:.06em;
  color:var(--on-dark-dim);
}

.page-about .ab-hero__cta{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:clamp(24px,3.2vw,38px);
}

/* ---------- 通用区块 ---------- */
.page-about .ab-section{
  padding:clamp(60px,8.4vw,116px) 0;
}

.page-about .ab-section--paper{
  background:var(--paper);
  color:var(--char);
}

.page-about .ab-head{
  max-width:44rem;
  margin-bottom:clamp(30px,4.6vw,56px);
}

.page-about .ab-h2{
  margin:10px 0 0;
  font-size:clamp(26px,4vw,50px);
  font-weight:800;
  line-height:1.12;
  letter-spacing:-.015em;
  color:var(--paper);
}

.page-about .ab-lede{
  margin:18px 0 0;
  max-width:34em;
  font-size:clamp(16px,1.5vw,19px);
  line-height:1.75;
  color:var(--on-dark);
}

.page-about .ab-body{
  margin:16px 0 0;
  max-width:36em;
  font-size:clamp(15.5px,1.35vw,17px);
  line-height:1.85;
  color:var(--on-dark);
}

.page-about .ab-section--paper .ab-h2{color:var(--char);}
.page-about .ab-section--paper .ab-lede{color:var(--ab-paper-ink);}
.page-about .ab-section--paper .index-label{color:var(--ab-gold-on-paper);}

/* ---------- 我们是谁 ---------- */
.page-about .ab-split{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(30px,4.6vw,60px);
}

.page-about .ab-split__main .ab-lede{
  color:var(--amber-soft);
}

.page-about .ab-figures{
  display:grid;
  grid-template-columns:repeat(2, minmax(0,1fr));
  gap:1px;
  align-content:start;
  background:var(--line-soft);
  border:1px solid var(--line-soft);
}

.page-about .ab-figure{
  display:flex;
  flex-direction:column;
  gap:6px;
  padding:20px 18px 22px;
  background:var(--ink-lift);
}

.page-about .ab-figure__n{
  font-size:clamp(20px,2.3vw,27px);
  font-weight:700;
  line-height:1.1;
  color:var(--amber-soft);
}

.page-about .ab-figure__t{
  font-size:12.5px;
  letter-spacing:.06em;
  color:var(--on-dark-dim);
}

/* ---------- 分类体系 ---------- */
.page-about .ab-cats{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(26px,4vw,50px);
}

.page-about .ab-cats__grid{
  display:grid;
  grid-template-columns:repeat(2, minmax(0,1fr));
  gap:10px;
  margin:0;
  padding:0;
  list-style:none;
}

.page-about .ab-cat{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:7px;
  padding:18px 16px 20px;
  background:var(--ink-lift);
  border-left:2px solid rgba(212,160,23,.32);
  clip-path:polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition:background .3s var(--ease), border-color .3s var(--ease), transform .3s var(--ease);
}

.page-about .ab-cat:hover,
.page-about .ab-cat:focus-within{
  background:#17594a;
  border-left-color:var(--amber);
  transform:translateY(-3px);
}

.page-about .ab-cat__n{
  font-size:11px;
  letter-spacing:.16em;
  color:var(--gray-green);
}

.page-about .ab-cat__name{
  font-size:clamp(16px,1.7vw,18px);
  font-weight:700;
  letter-spacing:.01em;
  color:var(--paper);
}

.page-about .ab-cat__count{
  margin-top:auto;
  font-size:12px;
  letter-spacing:.04em;
  color:var(--amber);
}

.page-about .ab-cats__fig{
  margin:0;
  border:1px solid var(--line-soft);
  background:var(--ink-deep);
}

.page-about .ab-cats__fig img{
  display:block;
  width:100%;
  height:auto;
  object-fit:cover;
}

.page-about .ab-cats__cap{
  display:block;
  padding:14px 16px 18px;
  font-size:13px;
  line-height:1.7;
  color:var(--on-dark-dim);
  border-top:1px solid var(--line-soft);
}

/* ---------- 团队分工 ---------- */
.page-about .ab-team{
  border-top:1px solid var(--line-soft);
}

.page-about .ab-team__row{
  padding:clamp(20px,2.6vw,28px) 0;
  border-bottom:1px solid var(--line-soft);
}

.page-about .ab-team__meta{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:16px;
}

.page-about .ab-team__role{
  font-size:clamp(17px,2vw,22px);
  font-weight:700;
  color:var(--paper);
}

.page-about .ab-team__num{
  font-size:14px;
  letter-spacing:.06em;
  color:var(--amber-soft);
}

.page-about .ab-team__track{
  height:6px;
  margin:14px 0 0;
  background:rgba(127,169,155,.16);
  overflow:hidden;
}

.page-about .ab-team__fill{
  display:block;
  height:100%;
}

.page-about .ab-team__fill--1{
  width:43.75%;
  background:linear-gradient(90deg, var(--amber) 0%, var(--amber-soft) 100%);
}

.page-about .ab-team__fill--2{
  width:37.5%;
  background:linear-gradient(90deg, var(--cyan) 0%, var(--amber) 100%);
}

.page-about .ab-team__fill--3{
  width:18.75%;
  background:linear-gradient(90deg, var(--coral) 0%, var(--amber) 100%);
}

.page-about .ab-team__desc{
  margin:12px 0 0;
  max-width:62ch;
  font-size:15px;
  line-height:1.8;
  color:var(--on-dark-dim);
}

.page-about .ab-team__fig{
  margin:clamp(28px,4vw,46px) 0 0;
}

.page-about .ab-team__fig img{
  display:block;
  width:100%;
  height:auto;
  max-height:380px;
  object-fit:cover;
  border:1px solid var(--line-soft);
  filter:saturate(.75);
}

/* ---------- 发展历程 ---------- */
.page-about .ab-history{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(26px,3.6vw,52px);
}

.page-about .ab-rail__list{
  display:flex;
  gap:6px;
  margin:0;
  padding:0 0 8px;
  list-style:none;
  overflow-x:auto;
  scrollbar-width:thin;
}

.page-about .ab-rail__link{
  display:flex;
  align-items:baseline;
  gap:9px;
  padding:8px 12px;
  white-space:nowrap;
  text-decoration:none;
  color:var(--gray-green);
  border-left:2px solid transparent;
  transition:color .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible{
  color:var(--amber-soft);
  background:rgba(18,76,60,.6);
}

.page-about .ab-rail__link[aria-current="true"]{
  color:var(--amber-soft);
  border-left-color:var(--amber);
}

.page-about .ab-rail__year{
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
}

.page-about .ab-rail__label{
  font-size:12px;
  letter-spacing:.06em;
}

.page-about .ab-stages{
  display:grid;
  gap:clamp(18px,2.6vw,28px);
}

.page-about .ab-stage{
  position:relative;
  padding:clamp(22px,3vw,34px) clamp(20px,3vw,36px);
  background:linear-gradient(180deg, var(--ink-lift) 0%, rgba(18,76,60,.42) 100%);
  border-left:2px solid var(--line);
  clip-path:polygon(0 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%);
  transition:border-color .3s var(--ease);
}

.page-about .ab-stage::before{
  content:"";
  position:absolute;
  left:-2px;
  top:0;
  width:2px;
  height:38px;
  background:var(--amber);
}

.page-about .ab-stage__year{
  margin:0;
  font-size:12px;
  letter-spacing:.18em;
  color:var(--amber);
}

.page-about .ab-stage__title{
  margin:10px 0 0;
  font-size:clamp(18px,2.3vw,27px);
  font-weight:800;
  line-height:1.26;
  color:var(--paper);
}

.page-about .ab-stage p{
  margin:12px 0 0;
  max-width:62ch;
  font-size:15.5px;
  line-height:1.85;
  color:var(--on-dark-dim);
}

/* ---------- 合作与供稿 ---------- */
.page-about .ab-cards{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:1px;
  background:rgba(26,26,26,.14);
  border:1px solid rgba(26,26,26,.14);
}

.page-about .ab-card{
  background:var(--paper);
  transition:background .3s var(--ease);
}

.page-about .ab-card[open]{
  background:var(--ink);
}

.page-about .ab-card__sum{
  display:flex;
  align-items:center;
  gap:14px;
  padding:20px 22px;
  cursor:pointer;
  list-style:none;
  font-size:clamp(15.5px,1.6vw,17px);
  font-weight:700;
  color:var(--char);
  transition:color .3s var(--ease);
}

.page-about .ab-card__sum::-webkit-details-marker{display:none;}

.page-about .ab-card__sum:focus-visible{
  outline:2px solid var(--coral);
  outline-offset:-4px;
}

.page-about .ab-card__idx{
  font-size:12px;
  letter-spacing:.12em;
  color:var(--ab-gold-on-paper);
  transition:color .3s var(--ease);
}

.page-about .ab-card__name{
  flex:1;
  min-width:0;
}

.page-about .ab-card__sign{
  position:relative;
  flex:none;
  width:14px;
  height:14px;
}

.page-about .ab-card__sign::before,
.page-about .ab-card__sign::after{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  width:100%;
  height:1.5px;
  background:var(--coral);
  transform:translateY(-50%);
  transition:transform .3s var(--ease);
}

.page-about .ab-card__sign::after{transform:translateY(-50%) rotate(90deg);}

.page-about .ab-card[open] .ab-card__sum{color:var(--paper);}
.page-about .ab-card[open] .ab-card__idx{color:var(--amber);}
.page-about .ab-card[open] .ab-card__sign::after{transform:translateY(-50%) rotate(0deg);}

.page-about .ab-card__body{
  margin:0;
  padding:0 22px 24px;
  font-size:15px;
  line-height:1.8;
  color:var(--on-dark-dim);
}

.page-about .ab-partners__cta{
  margin:clamp(26px,3.4vw,40px) 0 0;
}

/* ---------- 长期保障 ---------- */
.page-about .ab-assure{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:1px;
  margin:0;
  padding:0;
  list-style:none;
  background:var(--line-soft);
  border:1px solid var(--line-soft);
}

.page-about .ab-assure__item{
  padding:clamp(22px,3vw,34px) clamp(20px,2.6vw,30px);
  background:var(--ink);
}

.page-about .ab-assure__n{
  display:block;
  font-size:clamp(26px,3.4vw,40px);
  font-weight:700;
  line-height:1;
  letter-spacing:-.01em;
  color:var(--amber-soft);
}

.page-about .ab-assure__t{
  margin:14px 0 0;
  font-size:clamp(16px,1.7vw,19px);
  font-weight:700;
  color:var(--paper);
}

.page-about .ab-assure__item p{
  margin:10px 0 0;
  font-size:14.5px;
  line-height:1.8;
  color:var(--on-dark-dim);
}

/* ---------- 收束 ---------- */
.page-about .ab-closing{
  padding:clamp(52px,7vw,96px) 0 clamp(60px,8vw,110px);
  background:
    linear-gradient(180deg, var(--ink) 0%, var(--ink-deep) 100%);
  border-top:1px solid var(--line-soft);
}

.page-about .ab-closing__title{
  margin:0;
  max-width:20em;
  font-size:clamp(24px,3.4vw,42px);
  font-weight:800;
  line-height:1.18;
  letter-spacing:-.015em;
  color:var(--paper);
}

.page-about .ab-closing__links{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(180px,1fr));
  gap:1px;
  margin-top:clamp(26px,3.6vw,44px);
  background:var(--line-soft);
  border:1px solid var(--line-soft);
}

.page-about .ab-closing__link{
  display:flex;
  align-items:center;
  min-height:70px;
  padding:16px 20px;
  background:var(--ink-deep);
  color:var(--paper);
  font-size:15.5px;
  font-weight:700;
  text-decoration:none;
  transition:background .3s var(--ease), color .3s var(--ease);
}

.page-about .ab-closing__link:hover,
.page-about .ab-closing__link:focus-visible{
  background:var(--ink-lift);
  color:var(--amber-soft);
}

/* ---------- 响应式 ---------- */
@media (min-width:560px){
  .page-about .ab-cats__grid{grid-template-columns:repeat(3, minmax(0,1fr));}
  .page-about .ab-assure{grid-template-columns:repeat(2, minmax(0,1fr));}
}

@media (min-width:760px){
  .page-about .ab-figures{grid-template-columns:repeat(2, minmax(0,1fr));}
  .page-about .ab-cards{grid-template-columns:repeat(2, minmax(0,1fr));}
}

@media (min-width:900px){
  .page-about .ab-split{
    grid-template-columns:minmax(0,7fr) minmax(0,5fr);
    align-items:start;
  }
  .page-about .ab-assure{grid-template-columns:repeat(3, minmax(0,1fr));}
}

@media (min-width:960px){
  .page-about .ab-cats{
    grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);
    align-items:start;
  }
  .page-about .ab-history{
    grid-template-columns:132px minmax(0,1fr);
    align-items:start;
  }
  .page-about .ab-rail{
    position:sticky;
    top:calc(var(--header-h-scrolled) + 28px);
  }
  .page-about .ab-rail__list{
    flex-direction:column;
    gap:0;
    padding:0;
    overflow:visible;
  }
}

@media (prefers-reduced-motion:reduce){
  .page-about .ab-hero__line{
    animation:none;
  }
  .page-about .ab-cat,
  .page-about .ab-card,
  .page-about .ab-closing__link,
  .page-about .ab-rail__link{
    transition:none;
  }
  .page-about .ab-cat:hover,
  .page-about .ab-cat:focus-within{
    transform:none;
  }
}
<<<END>>>