.page-about{
  --about-rail-w:176px;
  --about-radius:var(--r-lg);
  background:var(--moon);
  color:var(--indigo);
}

/* ---------- 首屏 ---------- */
.page-about .about-top{
  position:relative;
  overflow:hidden;
  padding:clamp(24px,5vw,56px) var(--gutter) clamp(34px,6vw,72px);
  background:
    radial-gradient(120% 90% at 84% -12%, rgba(232,163,61,.20), transparent 62%),
    radial-gradient(90% 80% at -6% 108%, rgba(46,196,182,.14), transparent 66%),
    var(--indigo);
  color:var(--moon);
}

.page-about .about-top .breadcrumbs{
  font-size:.85rem;
  letter-spacing:.04em;
  color:var(--mist);
}
.page-about .about-top .breadcrumbs a{
  color:var(--mist);
  text-decoration:none;
}
.page-about .about-top .breadcrumbs a:hover{
  color:var(--amber);
}
.page-about .about-top .breadcrumbs__sep{
  margin:0 .45em;
  opacity:.6;
}

.page-about .about-top__grid{
  display:grid;
  gap:clamp(24px,4vw,48px);
  margin-top:clamp(20px,4vw,44px);
}
@media (min-width:900px){
  .page-about .about-top__grid{
    grid-template-columns:minmax(0,1.45fr) minmax(0,1fr);
    align-items:end;
  }
}

.page-about .about-top__lead .eyebrow{
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--amber);
  margin:0 0 clamp(12px,2vw,20px);
}

.page-about .about-h1{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(2.2rem,6.4vw,4.4rem);
  line-height:1.14;
  letter-spacing:.04em;
  margin:0 0 clamp(14px,2.4vw,24px);
  color:var(--moon);
}

.page-about .about-lede{
  max-width:44ch;
  font-size:clamp(1rem,1.15vw,1.125rem);
  line-height:1.85;
  color:rgba(245,247,250,.82);
  margin:0;
}

.page-about .about-actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:clamp(20px,3vw,32px);
}
.page-about .btn--ghost{
  background:transparent;
  color:var(--moon);
  border:1px solid rgba(245,247,250,.34);
}
.page-about .btn--ghost:hover{
  border-color:var(--teal);
  color:var(--teal);
}

.page-about .about-top__side{
  border:1px solid var(--line-dark);
  border-radius:var(--r-md);
  background:rgba(245,247,250,.06);
  backdrop-filter:blur(6px);
  padding:clamp(16px,2.4vw,24px);
}

.page-about .hero-stats{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:14px;
}
.page-about .hero-stats li{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:12px;
  padding-bottom:12px;
  border-bottom:1px solid var(--line-dark);
}
.page-about .hero-stats li:last-child{
  padding-bottom:0;
  border-bottom:0;
}
.page-about .hero-stats__num{
  font-family:var(--font-mono);
  font-size:clamp(1.25rem,2.2vw,1.6rem);
  color:var(--amber);
  letter-spacing:.02em;
  white-space:nowrap;
}
.page-about .hero-stats__key{
  font-size:.86rem;
  color:rgba(245,247,250,.72);
  text-align:right;
}
.page-about .hero-note{
  margin:clamp(14px,2vw,20px) 0 0;
  font-size:.82rem;
  line-height:1.75;
  color:rgba(245,247,250,.62);
}

/* ---------- 轨道 + 正文 ---------- */
.page-about .about-layout{
  padding:clamp(26px,5vw,60px) var(--gutter) clamp(48px,7vw,96px);
}
@media (min-width:1024px){
  .page-about .about-layout{
    display:grid;
    grid-template-columns:var(--about-rail-w) minmax(0,1fr);
    gap:clamp(28px,4vw,64px);
    max-width:var(--maxw);
    margin-inline:auto;
  }
}

.page-about .about-rail{
  display:none;
}
@media (min-width:1024px){
  .page-about .about-rail{
    display:block;
    position:sticky;
    top:clamp(88px,12vh,132px);
    align-self:start;
  }
}
.page-about .about-rail__title{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.24em;
  color:var(--mist);
  margin:0 0 14px;
}
.page-about .about-rail__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:2px;
  border-left:1px solid var(--line);
}
.page-about .about-rail__list a{
  display:flex;
  gap:10px;
  align-items:baseline;
  padding:8px 0 8px 14px;
  color:var(--indigo);
  text-decoration:none;
  font-size:.9rem;
  border-left:2px solid transparent;
  margin-left:-1px;
  transition:border-color .2s var(--ease), color .2s var(--ease);
}
.page-about .about-rail__list a .mono{
  font-family:var(--font-mono);
  font-size:.75rem;
  color:var(--mist);
  letter-spacing:.08em;
}
.page-about .about-rail__list a:hover{
  color:var(--amber);
  border-left-color:var(--amber);
}
.page-about .about-rail__list a:hover .mono{
  color:var(--amber);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter{
  padding:clamp(26px,4vw,48px) 0;
  border-top:1px solid var(--line);
}
.page-about .about-flow > .about-chapter:first-child{
  border-top:0;
  padding-top:0;
}

.page-about .chapter--paper{
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--about-radius);
  padding:clamp(22px,3.6vw,44px);
  margin-block:clamp(18px,3vw,34px);
}

.page-about .chapter--night{
  background:
    radial-gradient(90% 70% at 100% 0%, rgba(46,196,182,.14), transparent 60%),
    var(--ink);
  color:var(--moon);
  border-radius:var(--about-radius);
  border-top:0;
  padding:clamp(22px,3.6vw,44px);
  margin-block:clamp(18px,3vw,34px);
}

.page-about .chapter-head{
  display:flex;
  align-items:baseline;
  gap:clamp(10px,2vw,18px);
  margin-bottom:clamp(16px,2.4vw,26px);
}
.page-about .chapter-num{
  font-family:var(--font-mono);
  font-size:clamp(1.5rem,3vw,2.4rem);
  line-height:1;
  letter-spacing:.06em;
  color:var(--amber);
}
.page-about .chapter-title{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(1.4rem,3vw,2.35rem);
  line-height:1.28;
  letter-spacing:.03em;
  margin:0;
}
.page-about .chapter--night .chapter-title{
  color:var(--moon);
}

.page-about .chapter-lede{
  font-size:clamp(1rem,1.1vw,1.08rem);
  line-height:1.85;
  max-width:60ch;
  margin:0 0 clamp(18px,2.6vw,28px);
  color:rgba(27,42,74,.78);
}
.page-about .chapter--night .chapter-lede{
  color:rgba(245,247,250,.78);
}

.page-about .prose p{
  max-width:66ch;
  line-height:1.85;
  margin:0 0 1em;
}
.page-about .prose p:last-child{
  margin-bottom:0;
}

.page-about .chapter-split{
  display:grid;
  gap:clamp(20px,3vw,40px);
}
@media (min-width:780px){
  .page-about .chapter-split{
    grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);
    align-items:start;
  }
}

.page-about .about-quote{
  margin:clamp(18px,3vw,28px) 0 0;
  padding:8px 0 8px clamp(16px,2.4vw,22px);
  border-left:3px solid var(--amber);
  font-family:var(--font-display);
  font-size:clamp(1.05rem,1.9vw,1.32rem);
  line-height:1.72;
  letter-spacing:.02em;
  color:var(--indigo);
}

.page-about .about-figure{
  margin:0;
  border-radius:var(--r-md);
  overflow:hidden;
  background:linear-gradient(160deg, rgba(27,42,74,.92), rgba(15,27,51,.96));
}
.page-about .about-figure img{
  display:block;
  width:100%;
  height:auto;
  object-fit:cover;
}
.page-about .about-figure--wide{
  margin-bottom:clamp(20px,3vw,32px);
}
.page-about .about-figure--team{
  margin-top:clamp(20px,3vw,34px);
}

/* ---------- 三件事 ---------- */
.page-about .pillars{
  display:grid;
}
.page-about .pillar{
  display:grid;
  gap:6px;
  padding:clamp(16px,2.4vw,26px) 0;
  border-top:1px solid var(--line);
}
.page-about .pillar:first-child{
  border-top:0;
  padding-top:0;
}
@media (min-width:768px){
  .page-about .pillar{
    grid-template-columns:72px minmax(0,1fr);
    gap:clamp(16px,3vw,40px);
  }
}
.page-about .pillar__no{
  font-family:var(--font-mono);
  font-size:1rem;
  letter-spacing:.16em;
  color:var(--teal);
  margin:4px 0 0;
}
.page-about .pillar__title{
  font-family:var(--font-display);
  font-size:clamp(1.18rem,2vw,1.45rem);
  letter-spacing:.03em;
  margin:0 0 8px;
}
.page-about .pillar p{
  margin:0;
  line-height:1.85;
  max-width:64ch;
  color:rgba(27,42,74,.82);
}
.page-about .chapter-tail{
  margin:clamp(16px,2.4vw,24px) 0 0;
}
.page-about .text-link{
  color:var(--indigo);
  text-decoration:none;
  border-bottom:1px solid var(--amber);
  padding-bottom:2px;
  font-size:.95rem;
}
.page-about .text-link:hover{
  color:var(--amber);
}

/* ---------- 时间线 ---------- */
.page-about .tl{
  list-style:none;
  margin:0;
  padding:0;
  position:relative;
}
.page-about .tl::before{
  content:"";
  position:absolute;
  left:8px;
  top:12px;
  bottom:14px;
  width:1px;
  background:linear-gradient(to bottom, rgba(232,163,61,.75), rgba(143,163,200,.18));
}
.page-about .tl__item{
  position:relative;
  padding-left:clamp(30px,4vw,42px);
  padding-bottom:clamp(12px,2vw,20px);
}
.page-about .tl__item::before{
  content:"";
  position:absolute;
  left:0;
  top:7px;
  width:17px;
  height:17px;
  border-radius:50%;
  background:radial-gradient(circle at 68% 50%, var(--ink) 0 45%, var(--amber) 46% 100%);
  box-shadow:0 0 0 3px var(--ink), 0 0 0 4px rgba(232,163,61,.30);
}
.page-about .tl__item:last-child{
  padding-bottom:0;
}
.page-about .tl__details summary{
  cursor:pointer;
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:10px 14px;
}
.page-about .tl__details summary::-webkit-details-marker{
  display:none;
}
.page-about .tl__details summary::after{
  content:"＋";
  margin-left:auto;
  font-family:var(--font-mono);
  color:var(--mist);
  font-size:.95rem;
}
.page-about .tl__details[open] summary::after{
  content:"－";
  color:var(--teal);
}
.page-about .tl__year{
  font-family:var(--font-mono);
  font-size:.95rem;
  letter-spacing:.08em;
  color:var(--amber);
}
.page-about .tl__head{
  font-family:var(--font-display);
  font-size:clamp(1.02rem,1.8vw,1.28rem);
  letter-spacing:.03em;
  color:var(--moon);
}
.page-about .tl__body{
  margin:10px 0 0;
  max-width:62ch;
  font-size:.96rem;
  line-height:1.82;
  color:rgba(245,247,250,.76);
}

/* ---------- 团队 ---------- */
.page-about .team-grid{
  display:grid;
  gap:clamp(20px,3vw,40px);
  align-items:center;
}
@media (min-width:820px){
  .page-about .team-grid{
    grid-template-columns:minmax(0,240px) minmax(0,1fr);
  }
}
.page-about .donut{
  position:relative;
  width:min(240px,70vw);
  aspect-ratio:1 / 1;
  margin-inline:auto;
  border-radius:50%;
  display:grid;
  place-items:center;
  background:conic-gradient(from -90deg, var(--amber) 0 47.7%, var(--teal) 47.7% 73.3%, var(--mist) 73.3% 100%);
}
.page-about .donut::after{
  content:"";
  position:absolute;
  inset:22%;
  border-radius:50%;
  background:var(--moon);
}
.page-about .donut__hole{
  position:relative;
  z-index:1;
  text-align:center;
}
.page-about .donut__num{
  display:block;
  font-family:var(--font-mono);
  font-size:clamp(1.6rem,3vw,2.1rem);
  color:var(--indigo);
  letter-spacing:.02em;
}
.page-about .donut__label{
  font-size:.78rem;
  letter-spacing:.16em;
  color:var(--mist);
}

.page-about .legend{
  list-style:none;
  margin:0 0 clamp(12px,2vw,18px);
  padding:0;
  display:grid;
  gap:4px;
  max-width:340px;
}
.page-about .legend li{
  display:flex;
  align-items:center;
  gap:10px;
  padding:8px 10px;
  border-radius:var(--r-sm);
  transition:background .2s var(--ease);
}
.page-about .legend li:hover{
  background:rgba(27,42,74,.06);
}
.page-about .legend__dot{
  width:12px;
  height:12px;
  border-radius:50%;
  flex:0 0 auto;
  transition:transform .2s var(--ease);
}
.page-about .legend li:hover .legend__dot{
  transform:scale(1.35);
}
.page-about .legend__dot--amber{ background:var(--amber); }
.page-about .legend__dot--teal{ background:var(--teal); }
.page-about .legend__dot--mist{ background:var(--mist); }
.page-about .legend__key{
  font-size:.94rem;
  color:var(--indigo);
}
.page-about .legend__val{
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:.92rem;
  color:rgba(27,42,74,.72);
}
.page-about .team-copy p{
  margin:0;
  max-width:64ch;
  line-height:1.85;
  color:rgba(27,42,74,.82);
}

/* ---------- 安全 ---------- */
.page-about .sec-rows{
  list-style:none;
  margin:0 0 clamp(20px,3vw,32px);
  padding:0;
  display:grid;
  gap:0;
}
.page-about .sec-row{
  display:grid;
  gap:6px;
  padding:clamp(14px,2.2vw,22px) 0;
  border-top:1px solid var(--line);
}
.page-about .sec-row:first-child{
  border-top:0;
  padding-top:0;
}
@media (min-width:768px){
  .page-about .sec-row{
    grid-template-columns:96px minmax(0,1fr);
    gap:clamp(14px,2.5vw,28px);
    align-items:start;
  }
}
.page-about .sec-row__key{
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.14em;
  color:var(--teal);
  padding-top:.35em;
}
.page-about .sec-row__title{
  font-family:var(--font-display);
  font-size:clamp(1.1rem,1.8vw,1.35rem);
  letter-spacing:.03em;
  margin:0 0 6px;
}
.page-about .sec-row p{
  margin:0;
  max-width:64ch;
  line-height:1.82;
  color:rgba(27,42,74,.82);
}

.page-about .cert-grid{
  display:grid;
  gap:clamp(12px,2vw,20px);
}
@media (min-width:720px){
  .page-about .cert-grid{
    grid-template-columns:repeat(3, minmax(0,1fr));
  }
}
.page-about .cert{
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:var(--moon);
  padding:clamp(14px,2.2vw,20px);
  border-top:3px solid var(--teal);
}
.page-about .cert__year{
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.14em;
  color:var(--mist);
  margin:0 0 6px;
}
.page-about .cert__title{
  font-family:var(--font-display);
  font-size:1.05rem;
  letter-spacing:.03em;
  margin:0 0 8px;
}
.page-about .cert p{
  margin:0;
  font-size:.9rem;
  line-height:1.78;
  color:rgba(27,42,74,.76);
}

/* ---------- 覆盖与节奏 ---------- */
.page-about .reach-grid{
  display:grid;
  gap:clamp(20px,3vw,40px);
}
@media (min-width:860px){
  .page-about .reach-grid{
    grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);
    align-items:start;
  }
}
.page-about .reach-copy p{
  max-width:64ch;
  line-height:1.85;
  margin:0 0 1em;
  color:rgba(27,42,74,.84);
}
.page-about .reach-copy p:last-child{
  margin-bottom:0;
}
.page-about .reach-facts{
  display:grid;
  gap:10px;
}
@media (min-width:520px) and (max-width:859px){
  .page-about .reach-facts{
    grid-template-columns:repeat(2, minmax(0,1fr));
  }
}
.page-about .fact{
  display:flex;
  align-items:baseline;
  gap:12px;
  padding:clamp(12px,2vw,16px);
  border-radius:var(--r-md);
  background:var(--paper);
  border:1px solid var(--line);
  border-left:3px solid var(--amber);
}
.page-about .fact__num{
  font-family:var(--font-mono);
  font-size:clamp(1.05rem,2vw,1.25rem);
  color:var(--indigo);
  white-space:nowrap;
}
.page-about .fact__key{
  font-size:.85rem;
  color:rgba(27,42,74,.68);
}

.page-about .about-cta{
  margin-top:clamp(22px,3.4vw,38px);
  border-radius:var(--r-md);
  padding:clamp(18px,3vw,30px);
  background:
    radial-gradient(90% 120% at 90% -20%, rgba(232,163,61,.22), transparent 62%),
    var(--indigo);
  color:var(--moon);
  display:flex;
  flex-wrap:wrap;
  gap:16px;
  align-items:center;
  justify-content:space-between;
}
.page-about .about-cta__title{
  font-family:var(--font-display);
  font-size:clamp(1.15rem,2vw,1.4rem);
  letter-spacing:.03em;
  margin:0 0 6px;
  color:var(--moon);
}
.page-about .about-cta p{
  margin:0;
  font-size:.92rem;
  line-height:1.75;
  color:rgba(245,247,250,.76);
}
.page-about .about-cta__actions{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}
.page-about .about-cta .btn--quiet{
  background:transparent;
  color:var(--moon);
  border:1px solid rgba(245,247,250,.34);
}
.page-about .about-cta .btn--quiet:hover{
  border-color:var(--teal);
  color:var(--teal);
}
<<<END>>>