.page-about{
  --about-measure:34rem;
  --about-muted:var(--mist);
  background:var(--ink);
  color:var(--white);
  overflow-x:clip;
}
.page-about img{display:block;max-width:100%;height:auto}
.page-about a:focus-visible{outline:2px solid var(--yellow);outline-offset:3px}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position:relative;
  isolation:isolate;
  display:flex;
  align-items:flex-end;
  min-height:74vh;
  padding:112px 0 44px;
  background:var(--char);
  border-bottom:8px solid var(--yellow);
  overflow:hidden;
}
.page-about .about-hero-img{
  position:absolute;
  inset:0;
  z-index:-2;
  width:100%;
  height:100%;
  object-fit:cover;
  object-position:center 58%;
}
.page-about .about-hero::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:-1;
  background:linear-gradient(180deg,rgba(10,12,11,.86) 0%,rgba(11,31,23,.52) 44%,rgba(11,31,23,.96) 100%);
}
.page-about .about-hero-inner{width:100%}

.page-about .crumbs{margin:0 0 26px}
.page-about .crumbs-list{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin:0;
  padding:0;
  list-style:none;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--mist);
}
.page-about .crumbs-item{display:flex;align-items:center;gap:10px}
.page-about .crumbs-item + .crumbs-item::before{content:"/";color:var(--line)}
.page-about .crumbs a{color:var(--mist);text-decoration:none}
.page-about .crumbs a:hover{color:var(--yellow)}
.page-about .crumbs [aria-current]{color:var(--white)}

.page-about .eyebrow{color:var(--yellow);margin:0}
.page-about .about-eyebrow{margin-bottom:14px}
.page-about .about-h1{
  margin:0 0 18px;
  max-width:16em;
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(30px,6.4vw,58px);
  line-height:1.07;
  letter-spacing:-.01em;
  color:var(--white);
}
.page-about .about-lede{
  margin:0;
  max-width:30em;
  font-size:17px;
  line-height:1.8;
  color:var(--mist);
}

/* ---------- 章节外壳 ---------- */
.page-about .about-sec{position:relative;padding:52px 0}
.page-about .about-sec .wrap{position:relative}
.page-about .about-sec--light{background:var(--light);color:var(--ink);--about-muted:#46564c}
.page-about .about-sec--alt{background:var(--ink-2)}

.page-about .sec-head{display:flex;gap:18px;align-items:flex-start}
.page-about .spine{display:none}
.page-about .sec-head-main{min-width:0}
.page-about .sec-head-main .display-2{margin:10px 0 0;max-width:18em}
.page-about .about-sec--light .eyebrow{color:var(--red)}
.page-about .about-sec--light .spine{border-left-color:#c3cec6}

.page-about .about-intro{
  margin:16px 0 0;
  max-width:var(--about-measure);
  font-size:16px;
  line-height:1.85;
  color:var(--about-muted);
}

/* ---------- 01 起点 ---------- */
.page-about .origin-grid{display:grid;gap:32px;margin-top:26px}
.page-about .origin-main p{
  margin:0 0 20px;
  max-width:var(--about-measure);
  font-size:17px;
  line-height:1.85;
  color:var(--about-muted);
}
.page-about .origin-main p:last-child{margin-bottom:0}
.page-about .lead-quote{
  margin:0 0 26px;
  padding:2px 0 2px 18px;
  border-left:4px solid var(--yellow);
  font-size:20px;
  line-height:1.7;
  color:var(--white);
}
.page-about .origin-side{
  padding:24px;
  background:var(--ink-2);
  border:1px solid var(--line);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 20px),calc(100% - 20px) 100%,0 100%);
}
.page-about .origin-side p{
  margin:14px 0 0;
  font-size:14px;
  line-height:1.8;
  color:var(--mist);
}
.page-about .origin-side .mono-label{margin:0;color:var(--yellow)}
.page-about .origin-side-title{
  margin:12px 0 0;
  font-size:18px;
  font-weight:800;
  line-height:1.35;
  color:var(--white);
}

/* ---------- 02 时间线 ---------- */
.page-about .about-timeline{
  background:var(--char);
  border-top:8px solid var(--red);
  border-bottom:8px solid var(--line);
}
.page-about .tl-route{
  display:block;
  width:100%;
  max-width:300px;
  height:auto;
  margin:24px 0 0;
  overflow:visible;
}
.page-about .tl-route polyline{fill:none;stroke:var(--line);stroke-width:2;stroke-linejoin:round}
.page-about .tl-route circle{fill:var(--yellow)}

.page-about .tl-scroller{
  margin-top:30px;
  padding:0 20px 18px;
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
  scroll-snap-type:x proximity;
}
.page-about .tl-track{
  display:grid;
  grid-auto-flow:column;
  grid-auto-columns:minmax(258px,84vw);
  gap:18px;
  min-width:min-content;
  align-items:start;
}
.page-about .tl-phase{
  position:relative;
  padding:26px 0 0;
  border-top:1px solid var(--line);
  scroll-snap-align:start;
}
.page-about .tl-phase::before{
  content:"";
  position:absolute;
  top:-5px;
  left:0;
  width:9px;
  height:9px;
  background:var(--yellow);
}
.page-about .tl-phase--v2::before{background:var(--red)}
.page-about .tl-phase summary{
  display:block;
  list-style:none;
  cursor:pointer;
  padding:0 0 8px;
}
.page-about .tl-phase summary::-webkit-details-marker{display:none}
.page-about .tl-phase summary::marker{content:""}
.page-about .tl-tag{
  display:inline-block;
  margin-bottom:12px;
  padding:3px 9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  background:var(--yellow);
  color:var(--char);
}
.page-about .tl-phase--v2 .tl-tag{background:var(--red);color:var(--white)}
.page-about .tl-name{
  display:block;
  font-family:var(--font-display);
  font-size:22px;
  font-weight:800;
  line-height:1.28;
  color:var(--white);
}
.page-about .tl-phase[open] .tl-name{
  padding-left:12px;
  border-left:4px solid var(--yellow);
}
.page-about .tl-hint{
  display:inline-block;
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--gray);
}
.page-about .tl-phase[open] .tl-hint{color:var(--yellow)}
.page-about .tl-phase summary:hover .tl-name{color:var(--yellow)}
.page-about .tl-body{padding:8px 0 0}
.page-about .tl-body p{
  margin:0 0 14px;
  font-size:15px;
  line-height:1.8;
  color:var(--mist);
}
.page-about .tl-body .tl-meta{
  margin:0;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--yellow);
}

.page-about .tl-facts{
  list-style:none;
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:22px 18px;
  margin:36px 0 0;
  padding:0;
}
.page-about .fact-num{
  display:block;
  font-family:var(--font-mono);
  font-size:32px;
  font-weight:700;
  line-height:1;
  color:var(--yellow);
}
.page-about .fact-cap{
  display:block;
  margin-top:8px;
  font-size:13px;
  line-height:1.55;
  color:var(--mist);
}

/* ---------- 03 V3 版本 ---------- */
.page-about .v3-top{display:grid;gap:28px;margin-top:26px}
.page-about .v3-text p{
  margin:0 0 18px;
  max-width:var(--about-measure);
  font-size:16px;
  line-height:1.85;
  color:var(--about-muted);
}
.page-about .v3-fig{margin:0}
.page-about .v3-fig img{width:100%;object-fit:cover;object-position:center}
.page-about .media-caption{
  margin:10px 0 0;
  font-size:13px;
  line-height:1.6;
  color:var(--gray);
}

.page-about .cmp{position:relative;display:grid;gap:0;margin-top:40px}
.page-about .cmp-col{padding:24px 0}
.page-about .cmp-col--v2{border-top:2px solid #b9c5bd}
.page-about .cmp-col--v2 .mono-label{color:var(--gray)}
.page-about .cmp-col h3{
  margin:10px 0 0;
  font-size:20px;
  font-weight:800;
  line-height:1.35;
}
.page-about .cmp-list{
  list-style:none;
  display:grid;
  gap:12px;
  margin:16px 0 0;
  padding:0;
}
.page-about .cmp-list li{
  position:relative;
  padding-left:22px;
  font-size:15px;
  line-height:1.7;
  color:var(--about-muted);
}
.page-about .cmp-list li::before{
  content:"";
  position:absolute;
  left:0;
  top:.72em;
  width:10px;
  height:2px;
  background:currentColor;
  opacity:.55;
}
.page-about .cmp-col--v3{
  margin-top:16px;
  padding:28px 22px;
  background:var(--ink);
  color:var(--white);
}
.page-about .cmp-col--v3 .mono-label{color:var(--yellow)}
.page-about .cmp-col--v3 .cmp-list li{color:var(--mist)}
.page-about .cmp-col--v3 .cmp-list li::before{background:var(--yellow);opacity:1}

/* ---------- 04 团队 ---------- */
.page-about .team-grid{display:grid;gap:16px;margin-top:28px}
.page-about .team-card{
  padding:22px;
  background:var(--ink-2);
  border:1px solid var(--line);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%);
}
.page-about .team-num{
  margin:0 0 10px;
  font-family:var(--font-mono);
  font-size:38px;
  font-weight:700;
  line-height:1;
  color:var(--yellow);
}
.page-about .team-card h3{margin:0 0 10px;font-size:18px;font-weight:800}
.page-about .team-card p{margin:0;font-size:14px;line-height:1.8;color:var(--mist)}

.page-about .flow{list-style:none;margin:36px 0 0;padding:0}
.page-about .flow li{
  position:relative;
  padding:20px 0 20px 54px;
  border-top:1px solid var(--line);
}
.page-about .flow li:last-child{border-bottom:1px solid var(--line)}
.page-about .flow-idx{
  position:absolute;
  left:0;
  top:22px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--red);
}
.page-about .flow h3{margin:0 0 8px;font-size:17px;font-weight:800}
.page-about .flow p{
  margin:0;
  max-width:40em;
  font-size:15px;
  line-height:1.8;
  color:var(--mist);
}
.page-about .about-note{
  margin:30px 0 0;
  padding-top:18px;
  border-top:1px solid var(--line);
  max-width:46em;
  font-size:14px;
  line-height:1.8;
  color:var(--mist);
}

/* ---------- 05 做法 ---------- */
.page-about .ethos-list{
  list-style:none;
  display:grid;
  gap:2px;
  margin:28px 0 0;
  padding:0;
}
.page-about .ethos-list li{
  padding:22px 22px 22px 24px;
  background:var(--ink);
  border-left:4px solid var(--yellow);
}
.page-about .ethos-list li:nth-child(even){border-left-color:var(--red)}
.page-about .ethos-list h3{margin:0 0 10px;font-size:17px;font-weight:800;color:var(--white)}
.page-about .ethos-list p{
  margin:0;
  max-width:42em;
  font-size:15px;
  line-height:1.8;
  color:var(--mist);
}

/* ---------- 06 接下来 ---------- */
.page-about .next-grid{display:grid;gap:32px;margin-top:26px}
.page-about .next-text p{
  margin:0 0 18px;
  max-width:var(--about-measure);
  font-size:16px;
  line-height:1.85;
  color:var(--mist);
}
.page-about .next-links{list-style:none;margin:6px 0 26px;padding:0}
.page-about .next-links li{border-top:1px solid var(--line)}
.page-about .next-links li:last-child{border-bottom:1px solid var(--line)}
.page-about .next-links a{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:15px 4px;
  font-size:15px;
  color:var(--white);
  text-decoration:none;
  transition:color var(--dur) var(--ease);
}
.page-about .next-links a::after{
  content:"→";
  font-family:var(--font-mono);
  color:var(--yellow);
}
.page-about .next-links a:hover{color:var(--yellow)}
.page-about .next-cta{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin:0;
}
.page-about .next-fig{margin:0}
.page-about .next-fig img{width:100%;object-fit:cover;object-position:center}
.page-about .next-fig .media-caption{color:var(--mist)}

/* ---------- 断点 ---------- */
@media (min-width:760px){
  .page-about .about-sec{padding:72px 0}
  .page-about .lead-quote{font-size:21px}
  .page-about .about-lede{font-size:18px}
  .page-about .spine{
    display:block;
    flex:0 0 auto;
    padding:2px 0 10px 3px;
    border-left:2px solid var(--line);
    writing-mode:vertical-rl;
    font-family:var(--font-mono);
    font-size:12px;
    letter-spacing:.42em;
    color:var(--yellow);
  }
  .page-about .tl-scroller{padding:0 32px 24px}
  .page-about .tl-facts{grid-template-columns:repeat(4,minmax(0,1fr))}
  .page-about .fact-num{font-size:36px}
  .page-about .team-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
}

@media (min-width:900px){
  .page-about .about-hero{min-height:78vh;padding:132px 0 56px}
  .page-about .origin-grid{
    grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);
    gap:56px;
    align-items:start;
  }
  .page-about .origin-side{margin-top:56px}
  .page-about .tl-track{
    grid-auto-columns:minmax(0,1fr);
    gap:26px;
    min-width:0;
  }
  .page-about .v3-top{
    grid-template-columns:minmax(0,1fr) minmax(0,.92fr);
    gap:48px;
    align-items:start;
  }
  .page-about .cmp{grid-template-columns:1fr 1fr;gap:0;align-items:stretch}
  .page-about .cmp-col--v2{padding:28px 34px 28px 0;border-bottom:2px solid #b9c5bd}
  .page-about .cmp-col--v3{
    margin-top:0;
    padding:30px 34px 30px 42px;
    clip-path:polygon(26px 0,100% 0,100% 100%,0 100%);
  }
  .page-about .next-grid{
    grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);
    gap:56px;
    align-items:center;
  }
}

@media (min-width:1300px){
  .page-about .tl-scroller{padding:0 calc((100vw - 1240px) / 2) 28px}
}

@media (prefers-reduced-motion:reduce){
  .page-about .next-links a{transition:none}
}
<<<END>>>