.page-about{
  --about-lead:minmax(0,1.08fr);
  --about-side:minmax(0,.92fr);
  --about-rail:44px;
  background:var(--ink);
  color:var(--paper);
}

.page-about .section{
  padding-block:48px;
}

/* 章节头 */
.page-about .about-head{
  display:grid;
  gap:10px;
  margin-bottom:28px;
  max-width:52ch;
}
.page-about .about-head__num{
  display:inline-block;
  color:var(--volt);
  font-size:13px;
  letter-spacing:.16em;
  padding-bottom:6px;
  border-bottom:2px solid var(--volt);
  width:max-content;
}
.page-about .about-head__title{
  margin:0;
  font-size:clamp(1.45rem,3.6vw,2rem);
  line-height:1.22;
  letter-spacing:-.01em;
  font-weight:800;
}
.page-about .about-head__sub{
  margin:0;
  color:var(--mute);
  font-size:15px;
  line-height:1.8;
}

/* 首屏 */
.page-about .about-hero{
  display:grid;
  gap:28px;
  padding-block:24px 56px;
  position:relative;
}
.page-about .about-hero__title{
  margin:18px 0 16px;
  font-size:clamp(1.9rem,6vw,3.4rem);
  line-height:1.1;
  letter-spacing:-.015em;
  font-weight:800;
}
.page-about .about-hero__text{
  margin:0;
  max-width:36ch;
  color:var(--mute);
  font-size:var(--fs-body);
  line-height:1.85;
}
.page-about .about-hero__facts{
  display:flex;
  flex-wrap:wrap;
  gap:12px 28px;
  margin:26px 0 0;
  padding:0;
  list-style:none;
}
.page-about .about-hero__facts li{
  display:flex;
  align-items:baseline;
  gap:8px;
  padding-left:12px;
  border-left:2px solid var(--line);
}
.page-about .about-hero__facts span{
  font-family:var(--mono);
  font-size:26px;
  font-weight:700;
  color:var(--volt);
  line-height:1;
}
.page-about .about-hero__facts em{
  font-style:normal;
  font-size:13px;
  color:var(--mute);
  line-height:1.5;
}
.page-about .about-hero__fig{
  margin:0;
  align-self:end;
}
.page-about .about-hero__fig img{
  display:block;
  width:100%;
  height:auto;
  object-fit:cover;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 22px),calc(100% - 22px) 100%,0 100%);
  border:1px solid var(--line);
}

/* 时间轴 */
.page-about .tl{
  position:relative;
  margin:0;
  padding:0;
  list-style:none;
}
.page-about .tl::before{
  content:"";
  position:absolute;
  left:11px;
  top:10px;
  bottom:10px;
  width:2px;
  background:var(--line);
}
.page-about .tl__item{
  position:relative;
  padding-left:var(--about-rail);
  margin-bottom:14px;
}
.page-about .tl__node{
  position:relative;
  border:1px solid var(--line);
  background:var(--pitch);
  clip-path:polygon(0 0,calc(100% - 16px) 0,100% 16px,100% 100%,0 100%);
}
.page-about .tl__node::before{
  content:"";
  position:absolute;
  left:-38px;
  top:20px;
  width:12px;
  height:12px;
  background:var(--ink);
  border:2px solid var(--line);
  transform:rotate(45deg);
}
.page-about .tl__node[open]::before{
  background:var(--volt);
  border-color:var(--volt);
}
.page-about .tl__summary{
  display:flex;
  align-items:center;
  gap:12px;
  padding:16px 18px;
  cursor:pointer;
  list-style:none;
}
.page-about .tl__summary::-webkit-details-marker{display:none;}
.page-about .tl__summary::marker{content:"";}
.page-about .tl__stage{
  font-size:13px;
  color:var(--volt);
  border:1px solid var(--line);
  padding:2px 6px;
  letter-spacing:.08em;
}
.page-about .tl__name{
  flex:1 1 auto;
  font-size:15px;
  font-weight:700;
  line-height:1.5;
}
.page-about .tl__cue{
  width:10px;
  height:10px;
  border-right:2px solid var(--mute);
  border-bottom:2px solid var(--mute);
  transform:rotate(45deg);
  transition:transform .22s var(--ease),border-color .22s var(--ease);
  flex:none;
}
.page-about .tl__node[open] .tl__cue{
  transform:rotate(-135deg);
  border-color:var(--volt);
}
.page-about .tl__body{
  padding:0 18px 18px;
  border-top:1px solid var(--line);
  margin-top:0;
}
.page-about .tl__body p{
  margin:14px 0 0;
  color:var(--mute);
  font-size:15px;
  line-height:1.85;
  max-width:46ch;
}

/* 团队 */
.page-about .team-grid{
  gap:16px;
}
.page-about .team-card{
  padding:20px;
  background:var(--card);
  border:1px solid var(--line);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%);
  transition:border-color .22s var(--ease),background .22s var(--ease);
}
.page-about .team-card:hover,
.page-about .team-card:focus-within{
  background:var(--card-hi);
  border-color:var(--volt);
}
.page-about .team-card .card__title{
  margin:0 0 10px;
  font-size:19px;
  font-weight:800;
  letter-spacing:-.01em;
}
.page-about .team-card .card__text{
  margin:0;
  font-size:15px;
  line-height:1.85;
  color:var(--mute);
}
.page-about .team-card .card__meta{
  margin:16px 0 0;
  padding-top:12px;
  border-top:1px dashed var(--line);
  font-size:13px;
  color:var(--volt);
  letter-spacing:.04em;
}

/* 流程（奶油反色区） */
.page-about .about-flow{
  border-block:1px solid var(--line);
}
.page-about .about-flow .about-head__title{
  color:var(--ink);
}
.page-about .about-flow .about-head__sub{
  color:#4A5B52;
}
.page-about .about-flow .about-head__num{
  color:#2C6B22;
  border-bottom-color:#2C6B22;
}
.page-about .about-head--split{
  display:grid;
  gap:24px;
  max-width:none;
}
.page-about .about-head__text{
  display:grid;
  gap:10px;
  max-width:52ch;
}
.page-about .flow-fig{
  margin:0;
}
.page-about .flow-fig img{
  display:block;
  width:100%;
  height:auto;
  object-fit:cover;
  border:1px solid rgba(7,18,14,.22);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%);
}
.page-about .flow-filter{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-bottom:20px;
}
.page-about .flow-filter .chip{
  background:transparent;
  color:var(--ink);
  border:1px solid rgba(7,18,14,.32);
  padding:6px 12px;
  font-size:13px;
  font-family:var(--mono);
  letter-spacing:.04em;
  cursor:pointer;
}
.page-about .flow-filter .chip[aria-pressed="true"]{
  background:var(--ink);
  color:var(--volt);
  border-color:var(--ink);
}
.page-about .flow{
  display:grid;
  gap:12px;
  margin:0;
  padding:0;
  list-style:none;
}
.page-about .flow__item{
  position:relative;
  background:#FFFFFF;
  border:1px solid rgba(7,18,14,.16);
  padding:16px;
  clip-path:polygon(0 0,calc(100% - 16px) 0,100% 16px,100% 100%,0 100%);
}
.page-about .flow__item::after{
  content:"";
  position:absolute;
  top:0;
  right:0;
  width:16px;
  height:16px;
  background:var(--volt);
}
.page-about .flow__idx{
  display:block;
  font-size:22px;
  font-weight:700;
  color:#2C6B22;
  line-height:1;
  margin-bottom:10px;
}
.page-about .flow__name{
  margin:0 0 8px;
  font-size:15px;
  font-weight:800;
  color:var(--ink);
}
.page-about .flow__text{
  margin:0;
  font-size:13px;
  line-height:1.8;
  color:#3B4A43;
}
.page-about .flow__sla{
  margin:14px 0 0;
  padding-top:10px;
  border-top:1px dashed rgba(7,18,14,.24);
  font-size:12px;
  color:#2C6B22;
  letter-spacing:.04em;
}

/* 统计 */
.page-about .about-stats__grid{
  display:grid;
  gap:28px;
  align-items:start;
}
.page-about .about-stats__text{
  margin:0 0 24px;
  max-width:40ch;
  color:var(--mute);
  font-size:15px;
  line-height:1.85;
}
.page-about .stat-list{
  display:grid;
  gap:14px;
  margin:0;
  padding:0;
  list-style:none;
}
.page-about .stat-list .stat{
  display:grid;
  grid-template-columns:auto 1fr;
  align-items:baseline;
  gap:14px;
  padding-bottom:14px;
  border-bottom:1px solid var(--line);
}
.page-about .stat-list .stat__value{
  font-family:var(--mono);
  font-size:34px;
  font-weight:700;
  color:var(--volt);
  line-height:1;
}
.page-about .stat-list .stat__label{
  font-size:13px;
  color:var(--mute);
  line-height:1.6;
}
.page-about .about-stats__fig{
  margin:0;
}
.page-about .about-stats__fig img{
  display:block;
  width:100%;
  height:auto;
  object-fit:cover;
  border:1px solid var(--line);
  clip-path:polygon(0 0,calc(100% - 20px) 0,100% 20px,100% 100%,0 100%);
}

/* 覆盖区域 */
.page-about .reach-grid{
  display:grid;
  gap:28px;
}
.page-about .reach-map{
  display:grid;
  grid-template-columns:repeat(8,1fr);
  gap:6px;
  max-width:360px;
}
.page-about .reach-cell{
  aspect-ratio:1 / 1;
  background:var(--pitch);
  border:1px solid var(--line);
}
.page-about .reach-cell.is-on{
  background:var(--volt);
  border-color:var(--volt);
}
.page-about .reach-list{
  margin:0;
  display:grid;
  gap:14px;
}
.page-about .reach-row{
  padding-left:14px;
  border-left:2px solid var(--line);
}
.page-about .reach-row dt{
  font-size:15px;
  font-weight:700;
  color:var(--paper);
  margin-bottom:4px;
}
.page-about .reach-row dd{
  margin:0;
  font-size:14px;
  line-height:1.8;
  color:var(--mute);
}

/* 标注原则 */
.page-about .mark-split{
  gap:0;
  border:1px solid var(--line);
}
.page-about .mark-col{
  padding:22px 20px;
  background:var(--card);
}
.page-about .mark-col + .mark-col{
  border-top:1px solid var(--line);
}
.page-about .mark-swatch{
  display:block;
  width:44px;
  height:8px;
  margin-bottom:14px;
}
.page-about .mark-swatch--volt{background:var(--volt);}
.page-about .mark-swatch--warn{background:var(--warn);}
.page-about .mark-col__title{
  margin:0 0 10px;
  font-size:17px;
  font-weight:800;
  letter-spacing:-.01em;
}
.page-about .mark-col__text{
  margin:0;
  font-size:15px;
  line-height:1.85;
  color:var(--mute);
}
.page-about .mark-note{
  margin-top:22px;
  color:var(--mute);
  font-size:14px;
  line-height:1.9;
}

/* 收尾 */
.page-about .about-next{
  padding-block:48px 64px;
}
.page-about .about-next__inner{
  display:grid;
  gap:20px;
  padding:28px 22px;
  background:var(--pitch);
  border:1px solid var(--line);
  border-left:3px solid var(--volt);
}
.page-about .about-next__lead{
  margin:0;
  font-size:clamp(1.1rem,2.6vw,1.4rem);
  line-height:1.55;
  font-weight:700;
  max-width:38ch;
}
.page-about .about-next__acts{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px 22px;
}
.page-about .about-next__link{
  color:var(--glow);
  font-size:14px;
  text-decoration:none;
  border-bottom:1px solid var(--line);
  padding-bottom:2px;
}
.page-about .about-next__link:hover{
  color:var(--volt);
  border-bottom-color:var(--volt);
}

@media (min-width:760px){
  .page-about .section{padding-block:72px;}
  .page-about .about-hero{
    grid-template-columns:var(--about-lead) var(--about-side);
    align-items:end;
    gap:40px;
    padding-block:32px 80px;
  }
  .page-about .about-head--split{
    grid-template-columns:minmax(0,1fr) minmax(0,.8fr);
    align-items:end;
    gap:32px;
  }
  .page-about .about-stats__grid{
    grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);
    gap:48px;
  }
  .page-about .reach-grid{
    grid-template-columns:minmax(0,360px) minmax(0,1fr);
    gap:48px;
    align-items:start;
  }
  .page-about .mark-split{
    display:grid;
    grid-template-columns:1fr 1fr;
  }
  .page-about .mark-col + .mark-col{
    border-top:0;
    border-left:1px solid var(--line);
  }
  .page-about .mark-col{padding:28px 26px;}
}

@media (min-width:1000px){
  .page-about .about-hero{
    grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);
  }
  .page-about{--about-rail:52px;}
  .page-about .flow{
    grid-template-columns:repeat(5,minmax(0,1fr));
    gap:14px;
  }
  .page-about .team-grid{gap:20px;}
  .page-about .team-card{padding:26px;}
  .page-about .about-next__inner{
    grid-template-columns:minmax(0,1fr) auto;
    align-items:center;
    padding:36px 32px;
  }
}

@media (prefers-reduced-motion:reduce){
  .page-about .tl__cue{transition:none;}
  .page-about .team-card{transition:none;}
}
<<<END>>>