.page-about{
  --about-gap: clamp(18px,3.2vw,40px);
  --about-pad: clamp(38px,7vw,88px);
  background: var(--ink);
  color: var(--bone);
  overflow-x: hidden;
}

.page-about .breadcrumb{
  max-width: var(--shell);
  margin: 0 auto;
  padding: 18px var(--gutter) 0;
}
.page-about .breadcrumb ol{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--fs-12);
  letter-spacing: .08em;
}
.page-about .breadcrumb a{
  color: var(--bone-60);
  text-decoration: none;
  transition: color .18s var(--ease);
}
.page-about .breadcrumb a:hover{ color: var(--cyan); }
.page-about .breadcrumb li:not(:last-child)::after{
  content: "/";
  margin-left: 8px;
  color: var(--line-2);
}
.page-about .breadcrumb [aria-current]{
  color: var(--bone);
  font-weight: 600;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  padding: clamp(18px,4vw,42px) 0 clamp(38px,7vw,86px);
  background:
    radial-gradient(120% 100% at 88% -20%, var(--orange-12), transparent 58%),
    radial-gradient(90% 80% at 0% 0%, var(--cyan-14), transparent 55%);
}
.page-about .about-hero__grid{
  display: grid;
  gap: var(--about-gap);
}
.page-about .about-hero h1{
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(28px,7.4vw,92px);
  line-height: .98;
  letter-spacing: -.01em;
  margin: 14px 0 0;
}
.page-about .about-hero h1 em{
  font-style: normal;
  font-weight: 600;
  color: var(--orange);
}
.page-about .eyebrow{
  display: block;
  font-size: var(--fs-12);
  letter-spacing: .22em;
  color: var(--stone);
  margin: 0;
}
.page-about .about-hero__lead{
  margin-top: clamp(16px,2.6vw,26px);
  color: var(--bone-80);
  font-size: var(--fs-16);
  line-height: 1.85;
  max-width: 46ch;
}
.page-about .prose{
  color: var(--bone-80);
  font-size: var(--fs-16);
  line-height: 1.85;
  max-width: 52ch;
}
.page-about .prose p{ margin: 0 0 14px; }
.page-about .prose p:last-child{ margin-bottom: 0; }

.page-about .about-facts{
  list-style: none;
  margin: clamp(24px,4vw,42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-facts li{
  background: var(--char);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .about-facts .num{
  font-family: var(--font-mono);
  font-size: clamp(24px,4vw,34px);
  font-weight: 700;
  line-height: 1;
  color: var(--bone);
}
.page-about .about-facts li span:last-child{
  font-size: var(--fs-12);
  letter-spacing: .04em;
  color: var(--bone-60);
}

.page-about .about-index{
  border-top: 1px solid var(--line-2);
  padding-top: 16px;
}
.page-about .about-index__title{
  margin: 0 0 12px;
  font-size: var(--fs-12);
  letter-spacing: .24em;
  color: var(--stone);
}
.page-about .about-index ol{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}
.page-about .about-index a{
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 0;
  font-size: var(--fs-14);
  color: var(--bone-80);
  text-decoration: none;
  border-bottom: 1px solid rgba(110,122,114,.18);
  transition: color .18s var(--ease);
}
.page-about .about-index a .num{
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--clay);
  transition: color .18s var(--ease);
}
.page-about .about-index a:hover{ color: var(--cyan); }
.page-about .about-index a:hover .num{ color: var(--cyan); }
.page-about .about-index__cta{
  display: inline-block;
  margin-top: 16px;
  font-size: var(--fs-14);
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 3px;
}
.page-about .about-index__cta:hover{ color: var(--cyan); border-color: currentColor; }

/* ---------- 通用章节骨架 ---------- */
.page-about .about-sec{
  padding-block: var(--about-pad);
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 18px);
}
.page-about .about-sec--char{ background: var(--char); }
.page-about .about-sec--ink{ background: var(--ink); }
.page-about .about-sec--deep{ background: var(--deep); }
.page-about .about-sec--moss{
  background: linear-gradient(158deg, var(--moss) 0%, var(--ink) 72%);
}
.page-about .about-sec__grid{
  display: grid;
  gap: clamp(14px,2.4vw,28px);
}
.page-about .about-sec__marker{
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.page-about .about-sec__marker .num{
  font-family: var(--font-mono);
  font-weight: 300;
  font-size: clamp(28px,5vw,44px);
  line-height: 1;
  color: var(--orange);
}
.page-about .about-sec__label{
  font-size: var(--fs-12);
  letter-spacing: .26em;
  color: var(--stone);
}
.page-about .about-sec__body h2{
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(24px,3.6vw,44px);
  line-height: 1.1;
  letter-spacing: -.005em;
  margin: 0 0 clamp(14px,2.4vw,24px);
}

.page-about .about-two{
  display: grid;
  gap: var(--about-gap);
  margin-top: 6px;
}
.page-about .about-figure{ margin: 0; }
.page-about .about-figure figcaption{
  margin-top: 10px;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--stone);
  letter-spacing: .04em;
}
.page-about .media-frame{
  position: relative;
  overflow: hidden;
  background: var(--char);
  border: 1px solid var(--line);
}
.page-about .media-frame--wide{ aspect-ratio: 3 / 2; }
.page-about .media-frame--tall{ aspect-ratio: 5 / 7; }
.page-about .media-frame img{
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
  height: auto;
}
.page-about .media-frame--wide img,
.page-about .media-frame--tall img{ height: 100%; }
.page-about .media-frame__tag{
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 10px;
  font-size: var(--fs-12);
  letter-spacing: .12em;
  color: var(--bone-80);
  background: rgba(17,20,23,.86);
  border-top: 1px solid var(--line-2);
  border-right: 1px solid var(--line-2);
}
.page-about .about-quote{
  margin: clamp(20px,3vw,32px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--orange);
  font-family: var(--font-display);
  font-size: clamp(18px,2.4vw,26px);
  line-height: 1.45;
  color: var(--bone);
}

/* ---------- 三层内容体系 ---------- */
.page-about .about-strata{
  list-style: none;
  margin: clamp(22px,3vw,34px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-2);
}
.page-about .about-stratum{
  display: grid;
  gap: 10px;
  padding: clamp(18px,3vw,28px) 12px;
  border-bottom: 1px solid var(--line);
  transition: background .18s var(--ease), box-shadow .18s var(--ease);
}
.page-about .about-stratum:hover{
  background: rgba(53,230,210,.05);
  box-shadow: inset 2px 0 0 var(--cyan);
}
.page-about .about-stratum__no{
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--stone);
  letter-spacing: .1em;
}
.page-about .about-stratum__main h3{
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-20);
  line-height: 1.25;
}
.page-about .about-stratum__main p{
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--bone-60);
  max-width: 54ch;
}
.page-about .about-stratum__meta{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}
.page-about .about-stratum__meta a{
  font-size: var(--fs-14);
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53,230,210,.35);
  padding-bottom: 2px;
}
.page-about .about-stratum__meta a:hover{ color: var(--orange); border-color: var(--orange); }

/* ---------- 数据校验与认证 ---------- */
.page-about .about-verify{
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(22px,3vw,34px);
}
.page-about .about-flow{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .about-flow li{
  padding: 16px 18px 18px 20px;
  background: rgba(11,31,26,.62);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
}
.page-about .about-flow li:nth-child(2){ border-left-color: var(--cyan); }
.page-about .about-flow li:nth-child(3){ border-left-color: var(--clay); }
.page-about .about-flow__no{
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .18em;
  color: var(--stone);
}
.page-about .about-flow h3{
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-20);
}
.page-about .about-flow p{
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--bone-60);
}
.page-about .about-cert{
  list-style: none;
  margin: clamp(22px,4vw,36px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-cert li{
  background: var(--deep);
  padding: 16px;
}
.page-about .about-cert__tag{
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .14em;
  color: var(--cyan);
}
.page-about .about-cert p{
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--bone-60);
}

/* ---------- 里程碑 ---------- */
.page-about .about-timeline{
  list-style: none;
  margin: clamp(22px,3vw,34px) 0 0;
  padding: 0 0 0 28px;
  position: relative;
}
.page-about .about-timeline::before{
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--orange), var(--cyan) 55%, var(--clay));
}
.page-about .about-timeline li{
  position: relative;
  padding-bottom: clamp(22px,3.4vw,34px);
}
.page-about .about-timeline li:last-child{ padding-bottom: 0; }
.page-about .about-timeline li::before{
  content: "";
  position: absolute;
  left: -28px;
  top: 9px;
  width: 13px;
  height: 13px;
  background: var(--char);
  border: 1px solid var(--orange);
}
.page-about .about-timeline li:nth-child(2)::before{ border-color: var(--cyan); }
.page-about .about-timeline li:nth-child(3)::before{ border-color: var(--clay); }
.page-about .about-timeline li:nth-child(4)::before{ border-color: var(--alert); }
.page-about .about-timeline li:nth-child(5)::before{ border-color: var(--bone-60); }
.page-about .about-timeline__year{
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px,3vw,28px);
  letter-spacing: .04em;
  color: var(--bone);
  line-height: 1;
}
.page-about .about-timeline__body h3{
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-20);
  line-height: 1.25;
}
.page-about .about-timeline__body p{
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--bone-60);
  max-width: 52ch;
}

/* ---------- 团队与协作网络 ---------- */
.page-about .about-team{
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(22px,3vw,34px);
}
.page-about .about-roster{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2);
}
.page-about .about-roster li{
  display: grid;
  grid-template-columns: 30px minmax(0,1fr);
  gap: 12px;
  padding: 16px 18px;
  background: rgba(11,31,26,.55);
}
.page-about .about-roster .num{
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--clay);
  padding-top: 2px;
}
.page-about .about-roster h3{
  margin: 0 0 5px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-16);
  letter-spacing: .02em;
}
.page-about .about-roster p{
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--bone-60);
}
.page-about .about-network{
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.page-about .about-network li{
  padding: 6px 10px;
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--bone-80);
  border: 1px solid var(--line-2);
  background: rgba(169,86,59,.16);
}
.page-about .about-network li:nth-child(2n){
  background: rgba(53,230,210,.1);
}
.page-about .about-network li:nth-child(3n){
  background: rgba(255,106,26,.12);
}

/* ---------- 场景 ---------- */
.page-about .about-why{
  list-style: none;
  margin: clamp(22px,3vw,32px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .about-why__card{
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px;
  background: rgba(22,48,43,.55);
  border: 1px solid var(--line);
  border-top: 3px solid var(--orange);
}
.page-about .about-why__card:nth-child(2){ border-top-color: var(--cyan); }
.page-about .about-why__card:nth-child(3){ border-top-color: var(--clay); }
.page-about .about-why__card h3{
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-20);
  line-height: 1.25;
}
.page-about .about-why__card p{
  margin: 0;
  flex: 1;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--bone-60);
}
.page-about .about-why__card a{
  align-self: flex-start;
  font-size: var(--fs-14);
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53,230,210,.35);
  padding-bottom: 2px;
}
.page-about .about-why__card a:hover{ color: var(--orange); border-color: var(--orange); }

.page-about .about-cta{
  display: grid;
  gap: 16px;
  margin-top: clamp(24px,4vw,42px);
  padding: clamp(18px,3vw,28px);
  border: 1px solid var(--line-2);
  background: linear-gradient(90deg, var(--orange-12), rgba(22,48,43,.45));
}
.page-about .about-cta h3{
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-20);
  line-height: 1.3;
}
.page-about .about-cta p{
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--bone-60);
  max-width: 58ch;
}
.page-about .about-cta .btn{ justify-self: start; }

/* ---------- 断点 ---------- */
@media (min-width: 700px){
  .page-about .about-facts{ grid-template-columns: repeat(4, minmax(0,1fr)); }
  .page-about .about-cert{ grid-template-columns: repeat(2, minmax(0,1fr)); }
  .page-about .about-why{ grid-template-columns: repeat(2, minmax(0,1fr)); }
  .page-about .about-cta{ grid-template-columns: minmax(0,1fr) auto; align-items: center; }
  .page-about .about-cta .btn{ justify-self: end; }
}

@media (min-width: 900px){
  .page-about .about-hero__grid{
    grid-template-columns: minmax(0,1fr) 264px;
    column-gap: clamp(24px,4vw,60px);
    align-items: start;
  }
  .page-about .about-index{
    position: sticky;
    top: calc(var(--header-h) + 28px);
    border-top: none;
    border-left: 1px solid var(--line-2);
    padding: 0 0 0 18px;
  }
  .page-about .about-sec__grid{
    grid-template-columns: 188px minmax(0,1fr);
    column-gap: clamp(26px,4vw,64px);
  }
  .page-about .about-sec__marker{
    position: sticky;
    top: calc(var(--header-h) + 42px);
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  .page-about .about-stratum{
    grid-template-columns: 52px minmax(0,1fr) 190px;
    column-gap: clamp(16px,2.4vw,34px);
    align-items: start;
    padding-inline: 0;
  }
  .page-about .about-stratum__meta{
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 10px;
  }
  .page-about .about-verify{
    grid-template-columns: minmax(0,1.15fr) minmax(0,.85fr);
    align-items: start;
  }
  .page-about .about-team{
    grid-template-columns: minmax(0,1fr) minmax(0,.9fr);
    align-items: start;
  }
  .page-about .about-two{
    grid-template-columns: minmax(0,1.05fr) minmax(0,.95fr);
    align-items: start;
  }
}

@media (min-width: 1100px){
  .page-about .about-cert{ grid-template-columns: repeat(4, minmax(0,1fr)); }
  .page-about .about-why{ grid-template-columns: repeat(3, minmax(0,1fr)); }
}

@media (prefers-reduced-motion: reduce){
  .page-about .about-stratum,
  .page-about .about-index a,
  .page-about .about-stratum__meta a,
  .page-about .about-why__card a{
    transition: none;
  }
}
<<<END>>>