.page-about{
  --ab-hair:1px solid var(--line);
  --ab-hair-cool:1px solid var(--line-cool);
  --ab-rail-w:196px;
  background:var(--paper);
  color:var(--graphite);
}
.page-about .wrap{box-sizing:border-box;}
.page-about .eyebrow{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.08em;
  color:var(--blue-slate);
  margin:0 0 14px;
}
.page-about .section-title{
  font-family:var(--font-display);
  font-weight:700;
  letter-spacing:-.02em;
  line-height:1.24;
  color:var(--ink);
  margin:0;
  font-size:clamp(24px,4.2vw,34px);
}
.page-about .breadcrumb{padding:20px 0 4px;}

/* 首屏 */
.page-about .ab-hero{
  padding:clamp(28px,5vw,64px) 0 clamp(28px,4vw,52px);
  background:var(--paper);
  border-bottom:var(--ab-hair);
  position:relative;
}
.page-about .ab-hero::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:linear-gradient(to right, rgba(11,61,145,.05) 1px, transparent 1px);
  background-size:96px 100%;
  pointer-events:none;
}
.page-about .ab-hero__inner{
  display:grid;
  gap:28px;
  position:relative;
}
.page-about .ab-hero__title{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(30px,6vw,54px);
  line-height:1.14;
  letter-spacing:-.03em;
  color:var(--ink);
  margin:0 0 18px;
}
.page-about .ab-hero__lede{
  font-family:var(--font-serif);
  font-size:clamp(16px,2.3vw,19px);
  line-height:1.8;
  color:var(--graphite);
  margin:0 0 26px;
  max-width:34em;
}
.page-about .ab-hero__actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
}
.page-about .ab-hero__facts{
  background:var(--ice);
  border-top:2px solid var(--blue);
  padding:6px 18px 10px;
  box-shadow:var(--shadow);
}
.page-about .ab-fact{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:14px;
  padding:14px 0;
  border-bottom:var(--ab-hair-cool);
}
.page-about .ab-fact:last-child{border-bottom:0;}
.page-about .ab-fact__key{
  font-size:14px;
  color:var(--blue-slate);
  letter-spacing:.02em;
}
.page-about .ab-fact__val{
  font-size:20px;
  color:var(--ink);
  letter-spacing:.04em;
}

/* 起点 */
.page-about .ab-origin__inner{display:grid;gap:26px;}
.page-about .ab-sect-head{margin-bottom:26px;}
.page-about .ab-origin__cols{display:grid;gap:26px;}
.page-about .ab-origin__text p{
  margin:0;
  font-size:16px;
  line-height:1.85;
  color:var(--graphite);
}
.page-about .mono{
  font-family:var(--font-mono);
  font-size:.94em;
  letter-spacing:.02em;
  color:var(--blue);
}
.page-about .ab-pull{
  margin:0;
  padding:20px 0 4px 22px;
  border-left:2px solid var(--maple);
}
.page-about .ab-pull p{
  font-family:var(--font-serif);
  font-size:clamp(18px,3vw,22px);
  line-height:1.6;
  color:var(--ink);
  margin:0 0 12px;
}
.page-about .ab-pull cite{
  font-family:var(--font-mono);
  font-style:normal;
  font-size:12px;
  letter-spacing:.06em;
  color:var(--stone);
}

/* 时间轴 */
.page-about .ab-timeline__fig{margin:0 0 30px;}
.page-about .media-frame img{
  display:block;
  width:100%;
  height:auto;
  max-width:100%;
  object-fit:cover;
  background:var(--ice);
}
.page-about .ab-timeline__fig img{aspect-ratio:2 / 1;}
.page-about .media-frame__caption{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--stone);
  padding-top:10px;
  border-top:var(--ab-hair);
  margin-top:10px;
}
.page-about .ab-tl{display:grid;gap:24px;}
.page-about .ab-tl__rail{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}
.page-about .ab-tl__dot{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:7px 11px;
  border:var(--ab-hair-cool);
  background:var(--paper);
  color:var(--blue);
  font-size:13px;
  text-decoration:none;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.page-about .ab-tl__dot .mono{
  font-size:12px;
  color:var(--blue-slate);
}
.page-about .ab-tl__dot:hover,
.page-about .ab-tl__dot:focus-visible{
  border-color:var(--maple);
  color:var(--maple);
}
.page-about .ab-tl__dot:hover .mono,
.page-about .ab-tl__dot:focus-visible .mono{color:var(--maple);}
.page-about .ab-tl__dot--now{
  border-color:var(--maple);
}
.page-about .ab-tl__dot--now .mono{color:var(--maple);}
.page-about .ab-node{
  padding:0 0 24px;
  border-bottom:var(--ab-hair);
  margin-bottom:26px;
}
.page-about .ab-node:last-child{border-bottom:0;margin-bottom:0;padding-bottom:0;}
.page-about .ab-node__year{
  margin:0 0 6px;
  font-size:22px;
  letter-spacing:.06em;
  color:var(--blue);
  line-height:1;
}
.page-about .ab-node__title{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(17px,2.6vw,21px);
  letter-spacing:-.01em;
  color:var(--ink);
  margin:0 0 10px;
}
.page-about .ab-node__text{
  margin:0;
  font-size:15.5px;
  line-height:1.8;
  color:var(--graphite);
  max-width:38em;
}
.page-about .ab-node--now .ab-node__year{color:var(--maple);}
.page-about .ab-node--now{
  border-bottom:0;
  background:var(--ice);
  padding:20px 18px;
  box-shadow:var(--shadow);
}

/* 团队 */
.page-about .ab-team__grid{display:grid;gap:16px;}
.page-about .ab-role{
  background:var(--paper);
  border:var(--ab-hair);
  padding:22px 20px;
  box-shadow:var(--shadow);
  position:relative;
}
.page-about .ab-role::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  height:2px;
  width:0;
  background:var(--maple);
  transition:width .28s var(--ease);
}
.page-about .ab-role:hover::after{width:100%;}
.page-about .ab-role__idx{
  margin:0 0 10px;
  font-size:12px;
  letter-spacing:.1em;
  color:var(--amber);
}
.page-about .ab-role__title{
  font-family:var(--font-display);
  font-weight:700;
  font-size:18px;
  letter-spacing:-.01em;
  color:var(--ink);
  margin:0 0 10px;
}
.page-about .ab-role__text{
  margin:0 0 14px;
  font-size:15px;
  line-height:1.8;
  color:var(--graphite);
}
.page-about .ab-role__who{
  margin:0;
  padding-top:12px;
  border-top:var(--ab-hair-cool);
  font-size:13.5px;
  line-height:1.7;
  color:var(--blue-slate);
}
.page-about .ab-team__fig{
  margin:26px 0 0;
}
.page-about .ab-team__fig img{aspect-ratio:5 / 4;}

/* 准则（深色区） */
.page-about .ab-rules{
  background:var(--ink);
  color:var(--paper);
}
.page-about .ab-rules .section-title{color:var(--paper);}
.page-about .ab-rules .eyebrow{color:var(--amber);}
.page-about .ab-rules__lede{
  font-family:var(--font-serif);
  font-size:17px;
  line-height:1.8;
  color:#C9D6E4;
  margin:14px 0 0;
  max-width:32em;
}
.page-about .ab-rule-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:2px;
}
.page-about .ab-rule{
  background:rgba(252,251,247,.045);
  border-top:1px solid rgba(201,214,228,.22);
  padding:22px 18px;
}
.page-about .ab-rule__no{
  margin:0 0 8px;
  font-size:13px;
  letter-spacing:.12em;
  color:var(--amber);
}
.page-about .ab-rule__title{
  font-family:var(--font-display);
  font-weight:700;
  font-size:17px;
  letter-spacing:-.01em;
  color:var(--paper);
  margin:0 0 10px;
}
.page-about .ab-rule__text{
  margin:0;
  font-size:15px;
  line-height:1.82;
  color:#C9D6E4;
  max-width:38em;
}
.page-about .ab-rules__fig{
  margin:30px 0 0;
  border-top:1px solid rgba(201,214,228,.22);
  padding-top:24px;
}
.page-about .ab-rules__fig img{aspect-ratio:2 / 1;}
.page-about .ab-rules__fig .media-frame__caption{
  border-top:0;
  color:var(--stone);
  padding-top:10px;
}

/* 协作 */
.page-about .ab-eco__inner{display:grid;gap:30px;}
.page-about .ab-eco__text p{
  font-size:16px;
  line-height:1.85;
  color:var(--graphite);
  margin:0 0 16px;
  max-width:36em;
}
.page-about .ab-eco__links{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:22px;
}
.page-about .ab-eco__ghost{
  color:var(--blue);
  border-color:var(--blue-slate);
}
.page-about .ab-eco__meter{
  display:grid;
  gap:0;
  border-top:2px solid var(--blue);
  align-self:start;
}
.page-about .ab-meter{
  display:flex;
  align-items:baseline;
  gap:16px;
  padding:18px 0;
  border-bottom:var(--ab-hair);
}
.page-about .ab-meter__num{
  font-size:34px;
  line-height:1;
  color:var(--maple);
  letter-spacing:-.02em;
  min-width:52px;
}
.page-about .ab-meter__label{
  font-size:14px;
  line-height:1.65;
  color:var(--blue-slate);
}

/* 结尾行动区 */
.page-about .ab-cta{
  background:var(--sand);
  border-top:var(--ab-hair);
}
.page-about .ab-cta__inner{
  padding:34px 0 40px;
  display:grid;
  gap:20px;
}
.page-about .ab-cta__title{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(20px,3.4vw,26px);
  letter-spacing:-.02em;
  color:var(--ink);
  margin:0 0 10px;
}
.page-about .ab-cta__text{
  margin:0;
  font-size:15px;
  line-height:1.75;
  color:var(--graphite);
  max-width:34em;
}
.page-about .ab-cta__actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
}

/* 桌面 */
@media (min-width:860px){
  .page-about .ab-hero__inner{
    grid-template-columns:minmax(0,7fr) minmax(0,4fr);
    gap:56px;
    align-items:end;
  }
  .page-about .ab-origin__cols{
    grid-template-columns:minmax(0,7fr) minmax(0,4fr);
    gap:56px;
    align-items:start;
  }
  .page-about .ab-tl{
    grid-template-columns:var(--ab-rail-w) minmax(0,1fr);
    gap:48px;
    align-items:start;
  }
  .page-about .ab-tl__rail{
    flex-direction:column;
    flex-wrap:nowrap;
    gap:0;
    position:sticky;
    top:calc(var(--header-h) + 28px);
    align-self:start;
    border-left:1px solid var(--line-cool);
  }
  .page-about .ab-tl__dot{
    border:0;
    background:none;
    padding:11px 0 11px 22px;
    font-size:14px;
    position:relative;
  }
  .page-about .ab-tl__dot::before{
    content:"";
    position:absolute;
    left:-4.5px;
    top:50%;
    transform:translateY(-50%);
    width:8px;
    height:8px;
    border-radius:50%;
    background:var(--paper);
    border:1px solid var(--blue);
    transition:background .2s var(--ease),border-color .2s var(--ease);
  }
  .page-about .ab-tl__dot:hover::before,
  .page-about .ab-tl__dot:focus-visible::before{
    background:var(--maple);
    border-color:var(--maple);
  }
  .page-about .ab-tl__dot--now::before{
    background:var(--maple);
    border-color:var(--maple);
  }
  .page-about .ab-team__grid{
    grid-template-columns:repeat(3,minmax(0,1fr));
    gap:20px;
  }
  .page-about .ab-role{padding:26px 24px;}
  .page-about .ab-rule-list{grid-template-columns:repeat(3,minmax(0,1fr));gap:0;}
  .page-about .ab-rule{
    border-top:1px solid rgba(201,214,228,.22);
    border-left:1px solid rgba(201,214,228,.22);
    padding:26px 24px;
  }
  .page-about .ab-rule:first-child{border-left:0;}
  .page-about .ab-eco__inner{
    grid-template-columns:minmax(0,7fr) minmax(0,4fr);
    gap:56px;
    align-items:start;
  }
  .page-about .ab-cta__inner{
    grid-template-columns:minmax(0,7fr) minmax(0,4fr);
    gap:48px;
    align-items:center;
    padding:46px 0 52px;
  }
  .page-about .ab-cta__actions{justify-content:flex-end;}
}

@media (min-width:1100px){
  .page-about .ab-hero__title{letter-spacing:-.035em;}
  .page-about .ab-node{padding-bottom:30px;margin-bottom:32px;}
}

@media (prefers-reduced-motion:reduce){
  .page-about .ab-role::after,
  .page-about .ab-tl__dot::before{transition:none;}
}
<<<END>>>