.page-about{
  --about-h1:clamp(1.85rem,4.4vw,3.25rem);
  --about-h2:clamp(1.4rem,2.7vw,2.05rem);
  --about-rail:118px;
  padding-bottom:clamp(40px,6vw,88px);
  overflow-x:hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb{
  margin-top:clamp(22px,3.6vw,40px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  display:grid;
  gap:clamp(22px,3.6vw,44px);
  margin-top:clamp(18px,3vw,32px);
  padding-top:clamp(26px,4vw,46px);
  border-top:1px solid var(--gray-300);
}

@media (min-width:900px){
  .page-about .about-hero{
    grid-template-columns:minmax(0,1.02fr) minmax(0,.98fr);
    align-items:end;
  }
}

.page-about .about-hero__kicker{
  margin:0 0 16px;
  font-family:var(--font-mono);
  font-size:var(--fs-mono);
  letter-spacing:.14em;
  color:var(--legacy);
}

.page-about .about-hero h1{
  margin:0;
  font-family:var(--font-display);
  font-weight:700;
  font-size:var(--about-h1);
  line-height:1.12;
  letter-spacing:-.01em;
  color:var(--ink-900);
}

.page-about .about-hero__lead{
  margin:18px 0 0;
  max-width:46ch;
  font-size:var(--fs-body);
  line-height:1.78;
  color:var(--gray-500);
}

.page-about .about-hero__meta{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:22px 0 0;
  padding:0;
  list-style:none;
}

.page-about .about-hero__figure{
  margin:0;
}

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

/* ---------- 章节刻度带 ---------- */
.page-about .about-scale{
  margin-top:clamp(28px,4vw,46px);
  border-top:1px solid var(--gray-300);
}

.page-about .about-scale__list{
  display:flex;
  margin:0;
  padding:0;
  list-style:none;
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
}

.page-about .about-scale__item a{
  display:flex;
  align-items:center;
  gap:8px;
  padding:13px 18px;
  font-size:var(--fs-small);
  color:var(--gray-500);
  text-decoration:none;
  white-space:nowrap;
  border-right:1px solid var(--gray-300);
  transition:color var(--t-fast) var(--ease),background-color var(--t-fast) var(--ease);
}

.page-about .about-scale__item:first-child a{
  border-left:1px solid var(--gray-300);
}

.page-about .about-scale__item a:hover,
.page-about .about-scale__item a:focus-visible{
  color:var(--ink-900);
  background:var(--gray-100);
}

.page-about .about-scale__num{
  font-family:var(--font-mono);
  font-size:var(--fs-mono);
  letter-spacing:.06em;
  color:var(--signal);
}

/* ---------- 通用章节头 ---------- */
.page-about .about-section{
  margin-top:clamp(52px,7vw,96px);
}

.page-about .about-head{
  display:flex;
  align-items:baseline;
  gap:14px;
  padding-bottom:14px;
  margin-bottom:clamp(20px,3vw,32px);
  border-bottom:2px solid var(--ink-900);
}

.page-about .about-head__num{
  flex:none;
  font-family:var(--font-mono);
  font-size:var(--fs-mono);
  letter-spacing:.1em;
  color:var(--signal);
}

.page-about .about-head h2{
  margin:0;
  font-family:var(--font-display);
  font-weight:700;
  font-size:var(--about-h2);
  line-height:1.22;
  color:var(--ink-900);
}

.page-about .about-prose p{
  margin:0 0 16px;
  max-width:64ch;
  font-size:var(--fs-body);
  line-height:1.8;
  color:var(--gray-500);
}

.page-about .about-prose p:last-child{
  margin-bottom:0;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline{
  display:grid;
  gap:22px;
}

@media (min-width:1024px){
  .page-about .about-timeline{
    grid-template-columns:var(--about-rail) minmax(0,1fr);
    gap:clamp(30px,4.5vw,60px);
    align-items:start;
  }
}

.page-about .about-years{
  display:flex;
  gap:4px;
  overflow-x:auto;
  padding-bottom:4px;
  -webkit-overflow-scrolling:touch;
}

.page-about .about-years__link{
  flex:none;
  padding:9px 12px;
  font-family:var(--font-mono);
  font-size:var(--fs-mono);
  letter-spacing:.06em;
  color:var(--gray-500);
  text-decoration:none;
  border-bottom:2px solid var(--gray-300);
  transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease),background-color var(--t-fast) var(--ease);
}

.page-about .about-years__link:hover,
.page-about .about-years__link:focus-visible{
  color:var(--ink-900);
  border-bottom-color:var(--signal);
  background:var(--gray-100);
}

@media (min-width:1024px){
  .page-about .about-years{
    flex-direction:column;
    gap:2px;
    overflow:visible;
    padding-bottom:0;
    position:sticky;
    top:108px;
    align-self:start;
  }
  .page-about .about-years__link{
    border-bottom:0;
    border-left:2px solid var(--gray-300);
    text-align:left;
  }
  .page-about .about-years__link:hover,
  .page-about .about-years__link:focus-visible{
    border-left-color:var(--signal);
    border-bottom-color:transparent;
  }
}

.page-about .about-node{
  position:relative;
  margin:0 0 14px;
  background:var(--paper);
  border:1px solid var(--gray-300);
  border-left:3px solid var(--legacy);
  border-radius:var(--radius-m);
  transition:border-color var(--t-fast) var(--ease);
}

.page-about .about-node:last-child{
  margin-bottom:0;
}

.page-about .about-node:hover{
  border-top-color:var(--gray-500);
  border-right-color:var(--gray-500);
  border-bottom-color:var(--gray-500);
}

.page-about .about-node[open]{
  border-left-color:var(--signal);
}

.page-about .about-node > summary{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:8px 14px;
  padding:16px 20px;
  cursor:pointer;
  list-style:none;
}

.page-about .about-node > summary::-webkit-details-marker{
  display:none;
}

.page-about .about-node > summary::marker{
  content:"";
}

.page-about .about-node > summary::after{
  content:"+";
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:1rem;
  line-height:1;
  color:var(--signal);
}

.page-about .about-node[open] > summary::after{
  content:"–";
}

.page-about .about-node > summary:focus-visible{
  outline:2px solid var(--signal);
  outline-offset:-2px;
  border-radius:var(--radius-m);
}

.page-about .about-node__year{
  flex:none;
  font-family:var(--font-mono);
  font-size:.9375rem;
  font-weight:700;
  letter-spacing:.06em;
  color:var(--legacy);
}

.page-about .about-node[open] .about-node__year{
  color:var(--signal-deep);
}

.page-about .about-node__title{
  font-family:var(--font-sans);
  font-size:var(--fs-h3);
  font-weight:600;
  line-height:1.45;
  color:var(--ink-900);
}

.page-about .about-node__body{
  padding:2px 20px 20px;
  border-top:1px solid var(--gray-100);
  padding-top:14px;
}

.page-about .about-node__body p{
  margin:0;
  max-width:58ch;
  font-size:.95rem;
  line-height:1.8;
  color:var(--gray-500);
}

/* ---------- 能力线 ---------- */
.page-about .about-lines-figure{
  margin:0 0 clamp(22px,3.4vw,36px);
}

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

.page-about .about-lines{
  display:grid;
  gap:14px;
  margin:0;
  padding:0;
  list-style:none;
}

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

@media (min-width:1100px){
  .page-about .about-lines{
    grid-template-columns:repeat(4,minmax(0,1fr));
  }
}

.page-about .about-line{
  padding:20px 18px 22px;
  background:var(--gray-100);
  border-radius:var(--radius-m);
  border-top:3px solid var(--gray-300);
}

.page-about .about-line:nth-child(1){ border-top-color:var(--ink-900); }
.page-about .about-line:nth-child(2){ border-top-color:var(--legacy); }
.page-about .about-line:nth-child(3){ border-top-color:var(--volt); }
.page-about .about-line:nth-child(4){ border-top-color:var(--signal); }

.page-about .about-line__from{
  margin:0 0 10px;
  font-family:var(--font-mono);
  font-size:var(--fs-mono);
  letter-spacing:.06em;
  color:var(--gray-500);
}

.page-about .about-line__name{
  margin:0 0 10px;
  font-family:var(--font-sans);
  font-size:1.05rem;
  font-weight:600;
  line-height:1.4;
  color:var(--ink-900);
}

.page-about .about-line__desc{
  margin:0;
  font-size:.9rem;
  line-height:1.75;
  color:var(--gray-500);
}

/* ---------- 路径延续 ---------- */
.page-about .about-legacy{
  padding:clamp(26px,4vw,52px);
  border-radius:var(--radius-l);
}

.page-about .about-legacy__kicker{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:var(--fs-mono);
  letter-spacing:.16em;
  color:var(--signal);
}

.page-about .about-legacy h2{
  margin:0 0 20px;
  max-width:22ch;
  font-family:var(--font-display);
  font-weight:700;
  font-size:var(--about-h2);
  line-height:1.24;
  color:var(--paper);
}

.page-about .about-legacy p{
  margin:0 0 16px;
  max-width:62ch;
  font-size:var(--fs-body);
  line-height:1.8;
  color:var(--gray-300);
}

.page-about .about-legacy__codes{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin:24px 0 0;
  padding:0;
  list-style:none;
}

.page-about .about-legacy__code{
  padding:7px 12px;
  font-family:var(--font-mono);
  font-size:var(--fs-mono);
  letter-spacing:.04em;
  color:var(--paper);
  border:1px dashed var(--legacy);
  border-radius:var(--radius-s);
  background:rgba(255,255,255,.05);
}

.page-about .about-legacy__cta{
  margin:28px 0 0;
}

/* ---------- 团队与覆盖 ---------- */
.page-about .about-stats{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1px;
  margin:clamp(24px,3.6vw,40px) 0 0;
  padding:0;
  list-style:none;
  background:var(--gray-300);
  border:1px solid var(--gray-300);
  border-radius:var(--radius-m);
  overflow:hidden;
}

@media (min-width:760px){
  .page-about .about-stats{
    grid-template-columns:repeat(3,minmax(0,1fr));
  }
}

@media (min-width:1100px){
  .page-about .about-stats{
    grid-template-columns:repeat(6,minmax(0,1fr));
  }
}

.page-about .about-stat{
  padding:20px 16px 22px;
  background:var(--paper);
}

.page-about .about-stat__num{
  display:block;
  font-family:var(--font-mono);
  font-size:clamp(1.6rem,3.2vw,2.15rem);
  font-weight:700;
  line-height:1.05;
  letter-spacing:-.02em;
  color:var(--ink-900);
  font-variant-numeric:tabular-nums;
}

.page-about .about-stat__unit{
  font-size:.55em;
  margin-left:2px;
  color:var(--gray-500);
}

.page-about .about-stat__label{
  display:block;
  margin-top:8px;
  font-size:.8125rem;
  line-height:1.5;
  color:var(--gray-500);
}

.page-about .about-team-figure{
  margin:clamp(24px,3.6vw,40px) 0 0;
}

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

/* ---------- 资质 ---------- */
.page-about .about-certs{
  display:grid;
  gap:12px;
  margin:0;
  padding:0;
  list-style:none;
}

@media (min-width:640px){
  .page-about .about-certs{
    grid-template-columns:repeat(2,minmax(0,1fr));
  }
}

@media (min-width:1024px){
  .page-about .about-certs{
    grid-template-columns:repeat(4,minmax(0,1fr));
  }
}

.page-about .about-cert{
  padding:18px 16px 20px;
  background:var(--paper);
  border:1px solid var(--gray-300);
  border-radius:var(--radius-s);
  transition:border-color var(--t-fast) var(--ease),background-color var(--t-fast) var(--ease);
}

.page-about .about-cert:hover,
.page-about .about-cert:focus-within,
.page-about .about-cert:focus-visible{
  border-color:var(--signal);
  background:var(--gray-100);
  outline:none;
}

.page-about .about-cert__idx{
  display:block;
  margin-bottom:12px;
  font-family:var(--font-mono);
  font-size:var(--fs-mono);
  letter-spacing:.1em;
  color:var(--signal);
}

.page-about .about-cert__name{
  display:block;
  font-family:var(--font-sans);
  font-size:.95rem;
  font-weight:600;
  line-height:1.5;
  color:var(--ink-900);
}

.page-about .about-cert__meta{
  display:block;
  margin-top:10px;
  padding-top:10px;
  border-top:1px solid var(--gray-300);
  font-size:.8125rem;
  line-height:1.6;
  color:var(--gray-500);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners{
  display:grid;
  gap:14px;
}

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

.page-about .about-partner{
  padding:clamp(22px,3vw,32px);
  border-radius:var(--radius-m);
}

.page-about .about-partner__num{
  margin:0 0 6px;
  font-family:var(--font-mono);
  font-size:clamp(2.2rem,5vw,3.2rem);
  font-weight:700;
  line-height:1;
  letter-spacing:-.03em;
  color:var(--signal);
  font-variant-numeric:tabular-nums;
}

.page-about .about-partner__name{
  margin:0 0 14px;
  font-family:var(--font-sans);
  font-size:var(--fs-h3);
  font-weight:600;
  color:var(--ink-900);
}

.page-about .about-partner__desc{
  margin:0;
  font-size:.95rem;
  line-height:1.78;
  color:var(--gray-500);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta{
  display:grid;
  gap:22px;
  padding:clamp(26px,4vw,48px);
  background:var(--gray-100);
  border:1px solid var(--gray-300);
  border-radius:var(--radius-l);
}

@media (min-width:860px){
  .page-about .about-cta{
    grid-template-columns:minmax(0,1fr) auto;
    align-items:center;
    gap:40px;
  }
}

.page-about .about-cta h2{
  margin:0 0 12px;
  font-family:var(--font-display);
  font-weight:700;
  font-size:var(--about-h2);
  line-height:1.24;
  color:var(--ink-900);
}

.page-about .about-cta p{
  margin:0;
  max-width:56ch;
  font-size:var(--fs-body);
  line-height:1.78;
  color:var(--gray-500);
}

.page-about .about-cta__actions{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}
<<<END>>>