.page-about{
  --ab-rail-w:236px;
  --ab-gap:44px;
  position:relative;
  background:var(--ht-cream);
}

.page-about .ab-wrap{
  max-width:var(--ht-content-max);
  margin:0 auto;
  padding:28px 20px 64px;
}

/* 面包屑 */
.page-about .ab-crumb{
  font-size:12px;
  letter-spacing:.08em;
  color:var(--ht-graphite);
  margin-bottom:26px;
}
.page-about .ab-crumb a{color:var(--ht-graphite);text-decoration:none}
.page-about .ab-crumb a:hover{color:var(--ht-blue)}

/* 首屏 */
.page-about .ab-hero{
  position:relative;
  padding-bottom:40px;
  border-bottom:1px solid rgba(26,26,46,.18);
  margin-bottom:52px;
}
.page-about .ab-hero::after{
  content:"";
  position:absolute;
  inset:auto 0 -1px 0;
  height:3px;
  background:linear-gradient(90deg,var(--ht-blue) 0%,var(--ht-blue-soft) 42%,var(--ht-teal) 62%,var(--ht-orange) 100%);
  opacity:.85;
}
.page-about .ab-eyebrow-line{
  display:inline-block;
  width:52px;
  height:1px;
  margin-left:12px;
  vertical-align:middle;
  background:var(--ht-blue);
}
.page-about .ab-hero__title{
  margin:18px 0 20px;
  font-size:clamp(2.1rem,5.4vw,4.2rem);
  font-weight:300;
  line-height:1.08;
  letter-spacing:-.02em;
  color:var(--ht-ink);
}
.page-about .ab-hero__mark{
  position:relative;
  font-weight:900;
  color:var(--ht-blue);
}
.page-about .ab-hero__mark::after{
  content:"";
  position:absolute;
  left:-2px;
  right:-2px;
  bottom:6px;
  height:8px;
  background:var(--ht-orange);
  opacity:.22;
  z-index:-1;
}
.page-about .ab-hero__lead{
  max-width:64ch;
  color:#2c2c3d;
  margin:0 0 34px;
}
.page-about .ab-hero__facts{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1px;
  background:rgba(26,26,46,.14);
  border:1px solid rgba(26,26,46,.14);
}
.page-about .ab-fact{
  background:var(--ht-mist);
  padding:16px 18px;
  display:flex;
  flex-direction:column;
  gap:6px;
}
.page-about .ab-fact__num{
  font-size:1.5rem;
  font-weight:700;
  color:var(--ht-blue-deep);
  line-height:1;
}
.page-about .ab-fact__label{
  font-size:12.5px;
  letter-spacing:.06em;
  color:var(--ht-graphite);
}

/* 主体分屏 */
.page-about .ab-body{
  display:grid;
  grid-template-columns:1fr;
  gap:36px;
}

/* 左侧时间线 */
.page-about .ab-rail{
  border-left:1px solid rgba(26,26,46,.16);
  padding-left:22px;
}
.page-about .ab-rail__title{
  margin:0 0 18px;
  font-size:12px;
  letter-spacing:.2em;
  color:var(--ht-graphite);
}
.page-about .ab-timeline{
  list-style:none;
  margin:0;
  padding:0;
  position:relative;
}
.page-about .ab-timeline::before{
  content:"";
  position:absolute;
  left:5px;
  top:6px;
  bottom:6px;
  width:1px;
  background:linear-gradient(180deg,var(--ht-blue-line),rgba(217,228,255,.25));
}
.page-about .ab-timeline__item{position:relative}
.page-about .ab-timeline__link{
  display:grid;
  grid-template-columns:auto auto;
  grid-template-rows:auto auto;
  column-gap:10px;
  align-items:center;
  padding:12px 8px 12px 0;
  text-decoration:none;
  color:var(--ht-ink);
  border-radius:2px;
}
.page-about .ab-timeline__dot{
  grid-row:1 / span 2;
  position:relative;
  width:11px;
  height:11px;
  border-radius:50%;
  background:var(--ht-mist);
  box-shadow:0 0 0 1px var(--ht-blue-soft) inset;
  transition:background .18s var(--ht-ease), box-shadow .18s var(--ht-ease);
}
.page-about .ab-timeline__year{
  font-size:1.05rem;
  font-weight:700;
  color:var(--ht-ink);
}
.page-about .ab-timeline__tag{
  font-size:12px;
  color:var(--ht-graphite);
  letter-spacing:.04em;
}
.page-about .ab-timeline__link:hover .ab-timeline__year,
.page-about .ab-timeline__link:focus-visible .ab-timeline__year{color:var(--ht-blue)}
.page-about .ab-timeline__item.is-current .ab-timeline__dot{
  background:var(--ht-orange);
  box-shadow:0 0 0 5px rgba(255,107,53,.16);
}
.page-about .ab-timeline__item.is-current .ab-timeline__year{color:var(--ht-blue-deep)}
.page-about .ab-timeline__link:focus-visible{
  outline:3px solid var(--ht-orange);
  outline-offset:2px;
}
.page-about .ab-rail__foot{margin-top:22px}

/* 章节通用 */
.page-about .ab-sec{padding:6px 0}
.page-about .ab-head{
  display:flex;
  align-items:baseline;
  gap:14px;
  margin-bottom:26px;
}
.page-about .ab-head::after{
  content:"";
  flex:1;
  height:1px;
  background:rgba(26,26,46,.14);
}
.page-about .ab-head__num{
  font-size:12px;
  letter-spacing:.16em;
  color:var(--ht-orange);
  font-weight:700;
}
.page-about .ab-head .ht-h2{margin:0;color:var(--ht-ink)}
.page-about .ab-sec__lead{max-width:60ch;color:#2c2c3d}
.page-about .ab-rule{
  margin:52px 0;
  border-color:rgba(26,26,46,.16);
}
.page-about .ab-links{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:28px;
}

/* 01 我们为谁上门 */
.page-about .ab-split{
  display:grid;
  grid-template-columns:1fr;
  gap:28px;
}
.page-about .ab-split__text .ht-prose p:first-child{margin-top:0}
.page-about .ab-split__side{
  background:var(--ht-mist);
  border:1px solid var(--ht-blue-line);
  box-shadow:2px 2px 0 rgba(26,26,46,.9);
  padding:8px 20px;
}
.page-about .ab-who{
  list-style:none;
  margin:0;
  padding:0;
}
.page-about .ab-who__item{
  display:flex;
  flex-direction:column;
  gap:5px;
  padding:15px 0;
  border-bottom:1px dashed rgba(26,26,46,.14);
}
.page-about .ab-who__item:last-child{border-bottom:0}
.page-about .ab-who__k{
  font-weight:700;
  color:var(--ht-blue-deep);
  font-size:15px;
}
.page-about .ab-who__v{
  font-size:14.5px;
  line-height:1.7;
  color:#3a3a4a;
}

/* 02 版本 */
.page-about .ab-versions{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  grid-template-columns:1fr;
  gap:22px;
}
.page-about .ab-version{
  background:var(--ht-mist);
  padding:22px 22px 24px;
  transition:transform .18s var(--ht-ease), box-shadow .18s var(--ht-ease);
  box-shadow:3px 3px 0 rgba(26,26,46,.9);
}
.page-about .ab-version:hover,
.page-about .ab-version:focus-visible{
  transform:translate(-4px,-4px);
  box-shadow:7px 7px 0 rgba(26,26,46,.9);
}
.page-about .ab-version:focus-visible{outline:3px solid var(--ht-orange);outline-offset:3px}
.page-about .ab-version--now{
  background:linear-gradient(160deg,#ffffff 0%,var(--ht-mist) 55%,#eaf0ff 100%);
  border-color:var(--ht-blue);
}
.page-about .ab-version__top{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-bottom:14px;
}
.page-about .ab-version__v{
  font-size:1.35rem;
  font-weight:700;
  color:var(--ht-blue);
  letter-spacing:.02em;
}
.page-about .ab-version .ht-h3{margin:0 0 10px}
.page-about .ab-version__body{
  margin:0;
  font-size:14.5px;
  line-height:1.75;
  color:#3a3a4a;
}

/* 03 项目清单 */
.page-about .ab-list-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:30px;
}
.page-about .ab-cats{
  list-style:none;
  margin:22px 0;
  padding:0;
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1px;
  background:var(--ht-blue-line);
  border:1px solid var(--ht-blue-line);
}
.page-about .ab-cats__item{
  background:var(--ht-mist);
  padding:14px 14px;
  display:flex;
  align-items:center;
  gap:10px;
  font-size:14.5px;
  color:var(--ht-ink);
}
.page-about .ab-cats__i{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:24px;
  height:24px;
  flex:0 0 24px;
  background:var(--ht-blue);
  color:#fff;
  font-size:12px;
  font-weight:700;
  border-radius:2px;
}
.page-about .ab-cats__item:nth-child(2n) .ab-cats__i{background:var(--ht-blue-deep)}
.page-about .ab-cats__item:nth-child(3n) .ab-cats__i{background:var(--ht-blue-soft)}
.page-about .ab-dual{
  display:grid;
  grid-template-columns:1fr;
  gap:20px;
  margin-top:26px;
}
.page-about .ab-dual__col{
  border-top:2px solid var(--ht-blue);
  padding-top:14px;
}
.page-about .ab-dual__col .ht-h3{margin:0 0 8px}
.page-about .ab-dual__col p{
  margin:0;
  font-size:14.5px;
  line-height:1.75;
  color:#3a3a4a;
}
.page-about .ab-list-grid__fig{margin:0}
.page-about .ab-list-grid__fig .ht-figure__frame{height:100%}

/* 04 服务标准 */
.page-about .ab-standard{
  display:grid;
  grid-template-columns:1fr;
  gap:32px;
}
.page-about .ab-mods{
  list-style:none;
  margin:24px 0 26px;
  padding:0;
  display:grid;
  gap:12px;
}
.page-about .ab-mod{
  display:grid;
  grid-template-columns:auto 1fr;
  grid-template-rows:auto auto;
  column-gap:14px;
  padding:14px 16px;
  background:var(--ht-mist);
  border-left:3px solid var(--ht-orange);
}
.page-about .ab-mod__n{
  grid-row:1 / span 2;
  font-size:12px;
  letter-spacing:.1em;
  color:var(--ht-graphite);
  writing-mode:horizontal-tb;
  align-self:start;
  padding-top:2px;
  min-width:52px;
}
.page-about .ab-mod__t{
  font-size:15px;
  color:var(--ht-ink);
}
.page-about .ab-mod__d{
  font-size:14px;
  line-height:1.7;
  color:#45454f;
}
.page-about .ab-standard__side{
  display:grid;
  gap:24px;
  align-content:start;
}
.page-about .ab-standard__fig{margin:0}

/* 数据条 */
.page-about .ab-meter{
  background:var(--ht-mist);
  border:1px solid var(--ht-blue-line);
  box-shadow:2px 2px 0 rgba(26,26,46,.9);
  padding:22px 20px;
}
.page-about .ab-meter__row + .ab-meter__row{margin-top:18px}
.page-about .ab-meter__head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:12px;
  margin-bottom:8px;
}
.page-about .ab-meter__label{
  font-size:14px;
  color:#3a3a4a;
}
.page-about .ab-meter__val{
  font-size:1.05rem;
  font-weight:700;
  color:var(--ht-ink);
}
.page-about .ab-meter__track{
  height:10px;
  background:var(--ht-blue-line);
  overflow:hidden;
  border-radius:2px;
}
.page-about .ab-meter__fill{
  display:block;
  height:100%;
  width:var(--w);
  border-radius:2px;
  transform-origin:left center;
  transition:width .9s var(--ht-ease);
}
.page-about .ab-meter__fill--blue{background:linear-gradient(90deg,var(--ht-blue-deep),var(--ht-blue))}
.page-about .ab-meter__fill--teal{background:linear-gradient(90deg,var(--ht-blue-soft),var(--ht-teal))}
.page-about .ab-meter__fill--soft{background:linear-gradient(90deg,var(--ht-blue-line),var(--ht-blue-soft))}
.page-about .ab-meter__note{
  margin:18px 0 0;
  font-size:12.5px;
  line-height:1.7;
  color:var(--ht-graphite);
}
.page-about .ab-meter__note a{color:var(--ht-blue-deep)}

/* 05 长沙 */
.page-about .ab-cs__fig{margin:0 0 28px}
.page-about .ab-cs{
  display:grid;
  grid-template-columns:1fr;
  gap:26px;
}
.page-about .ab-cs__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:1px;
  background:rgba(26,26,46,.12);
  border:1px solid rgba(26,26,46,.12);
}
.page-about .ab-cs__list li{
  background:var(--ht-cream);
  padding:16px 18px;
  display:flex;
  flex-direction:column;
  gap:6px;
}
.page-about .ab-cs__list strong{
  color:var(--ht-blue-deep);
  font-size:15px;
}
.page-about .ab-cs__list span{
  font-size:14.5px;
  line-height:1.7;
  color:#3a3a4a;
}

/* 06 合作 */
.page-about .ab-partner{
  display:grid;
  grid-template-columns:1fr;
  gap:24px;
}
.page-about .ab-partner__panel{
  padding:28px 24px;
}
.page-about .ab-partner__num{
  display:block;
  font-size:3.4rem;
  font-weight:700;
  line-height:1;
  color:var(--ht-orange);
}
.page-about .ab-partner__cap{
  margin:12px 0 18px;
  font-size:15px;
  color:rgba(245,247,250,.9);
  line-height:1.7;
}
.page-about .ab-partner__body{
  margin:0 0 24px;
  font-size:14.5px;
  line-height:1.8;
  color:rgba(245,247,250,.78);
}
.page-about .ab-partner__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:18px;
}
.page-about .ab-partner__item{
  background:var(--ht-mist);
  border:1px solid var(--ht-blue-line);
  padding:18px 20px;
  transition:transform .18s var(--ht-ease), box-shadow .18s var(--ht-ease);
  box-shadow:2px 2px 0 rgba(26,26,46,.9);
}
.page-about .ab-partner__item:hover{
  transform:translate(-3px,-3px);
  box-shadow:5px 5px 0 rgba(26,26,46,.9);
}
.page-about .ab-partner__item .ht-h3{margin:0 0 8px}
.page-about .ab-partner__item p{
  margin:0;
  font-size:14.5px;
  line-height:1.75;
  color:#3a3a4a;
}

/* 收尾 */
.page-about .ab-cta{padding-bottom:12px}
.page-about .ab-cta__box{
  position:relative;
  background:linear-gradient(120deg,#eaf0ff 0%,var(--ht-mist) 48%,#fff2ec 100%);
  border:1px solid rgba(26,26,46,.2);
  box-shadow:4px 4px 0 rgba(26,26,46,.9);
  padding:32px 24px;
}
.page-about .ab-cta__box::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:88px;
  height:4px;
  background:var(--ht-orange);
}
.page-about .ab-cta__title{margin:0 0 14px}
.page-about .ab-cta__text{
  margin:0 0 24px;
  max-width:58ch;
  font-size:15px;
  line-height:1.8;
  color:#3a3a4a;
}
.page-about .ab-cta__links{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin:0;
}

/* 平板 */
@media (min-width:720px){
  .page-about .ab-wrap{padding:36px 32px 80px}
  .page-about .ab-hero__facts{grid-template-columns:repeat(4,minmax(0,1fr))}
  .page-about .ab-split{grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:32px}
  .page-about .ab-versions{grid-template-columns:repeat(2,minmax(0,1fr))}
  .page-about .ab-cats{grid-template-columns:repeat(3,minmax(0,1fr))}
  .page-about .ab-dual{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px}
  .page-about .ab-cs{grid-template-columns:minmax(0,1.2fr) minmax(0,.8fr);gap:32px}
  .page-about .ab-partner{grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:28px}
  .page-about .ab-cta__box{padding:40px 36px}
}

/* 桌面：左栏时间线 + 右栏章节 */
@media (min-width:1024px){
  .page-about .ab-body{
    grid-template-columns:var(--ab-rail-w) minmax(0,1fr);
    gap:var(--ab-gap);
    align-items:start;
  }
  .page-about .ab-rail{
    position:sticky;
    top:28px;
    padding-left:24px;
    border-left:1px solid rgba(26,26,46,.2);
  }
  .page-about .ab-list-grid{grid-template-columns:minmax(0,1.35fr) minmax(0,.65fr);gap:38px}
  .page-about .ab-standard{grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:40px}
  .page-about .ab-versions{gap:26px}
  .page-about .ab-sec{padding:10px 0}
}

@media (min-width:1280px){
  .page-about{--ab-rail-w:268px;--ab-gap:56px}
  .page-about .ab-version{padding:26px 26px 28px}
}

/* 减少动效 */
@media (prefers-reduced-motion:reduce){
  .page-about .ab-version,
  .page-about .ab-partner__item,
  .page-about .ab-meter__fill{transition:none}
  .page-about .ab-version:hover,
  .page-about .ab-version:focus-visible,
  .page-about .ab-partner__item:hover{transform:none}
}
</main>

.page-about {
  --w: 1rem;
}