.page-about{
  --about-line:1px solid var(--ink-700);
  --about-pad:18px;
  background:var(--ink-900);
  color:var(--paper-light);
  padding:22px 0 64px;
  overflow-x:hidden;
  position:relative;
}
.page-about .container{
  max-width:1240px;
  margin-inline:auto;
  padding-inline:var(--about-pad);
  position:relative;
  z-index:1;
}
.page-about a{color:var(--blue);text-decoration:none;}
.page-about a:hover{text-decoration:underline;}
.page-about h1,
.page-about h2,
.page-about h3{
  margin:0;
  font-family:var(--font-sans);
  font-weight:900;
  letter-spacing:-.01em;
  color:var(--paper-light);
}
.page-about p{margin:0;}
.page-about img{max-width:100%;height:auto;display:block;}

/* 面包屑 */
.page-about .about-crumb{
  display:flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--mist);
  padding-bottom:18px;
  border-bottom:var(--about-line);
}
.page-about .about-crumb a{color:var(--mist);}
.page-about .about-crumb a:hover{color:var(--tiger);text-decoration:none;}
.page-about .about-crumb .breadcrumb__sep{color:var(--ink-700);}
.page-about .about-crumb [aria-current]{color:var(--tiger);}

/* 首屏 */
.page-about .about-hero{
  position:relative;
  display:grid;
  gap:26px;
  padding:34px 0 30px;
  border-bottom:var(--about-line);
}
.page-about .about-hero::before{
  content:"";
  position:absolute;
  top:-120px;
  right:-140px;
  width:min(460px,72vw);
  height:min(460px,72vw);
  background:radial-gradient(circle,rgba(47,227,196,.22) 0%,rgba(47,227,196,0) 68%);
  pointer-events:none;
  z-index:0;
}
.page-about .about-hero__body{position:relative;z-index:1;}
.page-about .about-hero__eyebrow{
  font-size:11px;
  letter-spacing:.16em;
  color:var(--tiger);
  margin-bottom:16px;
}
.page-about .about-hero h1{
  font-size:clamp(30px,7.6vw,60px);
  line-height:1.08;
  max-width:18em;
}
.page-about .about-hero__lead{
  margin-top:18px;
  max-width:34em;
  font-size:16px;
  line-height:1.85;
  color:var(--mist);
}
.page-about .about-hero__facts{
  list-style:none;
  margin:26px 0 0;
  padding:18px 0 0;
  border-top:var(--about-line);
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:16px 12px;
}
.page-about .about-hero__facts li{display:flex;flex-direction:column;gap:4px;}
.page-about .about-hero__facts .mono{
  font-family:var(--font-mono);
  font-size:22px;
  letter-spacing:.04em;
  color:var(--tiger);
}
.page-about .about-hero__facts li span:last-child{
  font-size:12px;
  letter-spacing:.04em;
  color:var(--mist);
}
.page-about .about-hero__media{
  position:relative;
  margin:0;
  border:var(--about-line);
  overflow:hidden;
  background:var(--ink-800);
}
.page-about .about-hero__media img{
  width:100%;
  aspect-ratio:16/9;
  object-fit:cover;
}
.page-about .media__caption{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  padding:26px 14px 12px;
  font-size:11px;
  letter-spacing:.06em;
  color:var(--paper-light);
  background:linear-gradient(to top,rgba(11,14,17,.92),rgba(11,14,17,0));
}

/* 虎纹分隔带 */
.page-about .about-beam{
  height:8px;
  margin:0 0 6px;
  background:repeating-linear-gradient(45deg,var(--tiger) 0 6px,var(--ink-900) 6px 16px);
  opacity:.55;
}

/* 章节通用 */
.page-about .about-section{
  padding-top:44px;
  scroll-margin-top:calc(var(--header-h) + 16px);
}
.page-about .section-head{
  display:grid;
  gap:8px;
  padding-bottom:14px;
  border-bottom:var(--about-line);
  margin-bottom:24px;
}
.page-about .section-head__index{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--tiger);
}
.page-about .section-head__title{
  font-size:clamp(21px,4.8vw,31px);
  line-height:1.2;
}
.page-about .section-head__note{
  font-size:12.5px;
  line-height:1.7;
  color:var(--mist);
}

/* 叙事正文 */
.page-about .about-cols{display:grid;gap:24px;}
.page-about .about-text{max-width:38em;}
.page-about .about-text p,
.page-about .about-text--wide{
  font-size:16px;
  line-height:1.9;
  color:var(--mist);
}
.page-about .about-text p + p{margin-top:16px;}
.page-about .about-text strong{color:var(--paper-light);font-weight:600;}
.page-about .about-text--wide{
  max-width:46em;
  margin-bottom:24px;
}

/* 旁注 */
.page-about .about-aside{
  border-left:2px solid var(--tiger);
  padding:14px 0 14px 16px;
  background:linear-gradient(90deg,rgba(255,106,26,.07),rgba(255,106,26,0) 70%);
  align-self:start;
}
.page-about .about-aside__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--gold);
  margin-bottom:12px;
}
.page-about .about-aside__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:9px;
}
.page-about .about-aside__list li{
  font-size:13.5px;
  line-height:1.7;
  color:var(--paper-light);
  padding-left:12px;
  position:relative;
}
.page-about .about-aside__list li::before{
  content:"";
  position:absolute;
  left:0;
  top:9px;
  width:5px;
  height:1px;
  background:var(--tiger);
}

/* 团队分工 */
.page-about .about-team__grid{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:14px;
}
.page-about .about-team__card{
  position:relative;
  background:var(--ink-800);
  border:var(--about-line);
  padding:22px 18px 20px;
  display:flex;
  flex-direction:column;
  gap:10px;
  transition:background var(--dur) var(--ease);
}
.page-about .about-team__card::before{
  content:"";
  position:absolute;
  left:0;
  top:0;
  width:2px;
  height:0;
  background:var(--tiger);
  transition:height var(--dur) var(--ease);
}
.page-about .about-team__card:hover::before,
.page-about .about-team__card:focus-within::before{height:100%;}
.page-about .about-team__card:hover{background:var(--ink-800);}
.page-about .about-team__card .card__tag{
  position:absolute;
  top:0;
  right:0;
  padding:4px 9px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.12em;
  color:var(--mist);
  background:var(--ink-700);
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease);
}
.page-about .about-team__card:hover .card__tag,
.page-about .about-team__card:focus-within .card__tag{
  background:var(--ember);
  color:var(--ink-900);
}
.page-about .about-team__card h3{
  font-size:20px;
  line-height:1.3;
  padding-right:64px;
}
.page-about .about-team__desc{
  font-size:14.5px;
  line-height:1.85;
  color:var(--mist);
}
.page-about .about-team__meta{
  margin-top:auto;
  padding-top:12px;
  border-top:var(--about-line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.04em;
  line-height:1.7;
  color:var(--gold);
}

.page-about .about-figure{
  margin:26px 0 0;
  position:relative;
  border:var(--about-line);
  background:var(--ink-800);
  overflow:hidden;
}
.page-about .about-figure img{
  width:100%;
  aspect-ratio:4/3;
  object-fit:cover;
}

/* 时间线 */
.page-about .about-stage{display:grid;gap:20px;}
.page-about .about-stage__index{
  display:flex;
  gap:6px;
  overflow-x:auto;
  padding-bottom:8px;
  border-bottom:var(--about-line);
  scrollbar-width:thin;
}
.page-about .about-stage__year{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--mist);
  padding:5px 9px;
  border:1px solid var(--ink-700);
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.page-about .about-stage__year:hover{color:var(--ember);text-decoration:none;border-color:var(--ember);}
.page-about .about-stage__year.is-active{
  color:var(--tiger);
  border-color:var(--tiger);
}
.page-about .about-stage__list{
  list-style:none;
  margin:0;
  padding:0;
  position:relative;
}
.page-about .about-stage__list::before{
  content:"";
  position:absolute;
  left:5px;
  top:8px;
  bottom:8px;
  width:1px;
  background:var(--ink-700);
}
.page-about .about-stage__item{
  position:relative;
  padding:0 0 34px 30px;
  scroll-margin-top:calc(var(--header-h) + 20px);
}
.page-about .about-stage__item:last-child{padding-bottom:0;}
.page-about .about-stage__item::before{
  content:"";
  position:absolute;
  left:0;
  top:7px;
  width:11px;
  height:11px;
  border-radius:50%;
  border:1px solid var(--tiger);
  background:var(--ink-900);
}
.page-about .about-stage__num{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--tiger);
  margin-bottom:6px;
}
.page-about .about-stage__item h3{
  font-size:19px;
  line-height:1.35;
  margin-bottom:8px;
}
.page-about .about-stage__p{
  font-size:15px;
  line-height:1.9;
  color:var(--mist);
  max-width:36em;
}

/* 服务标准 */
.page-about .about-std__list{
  margin:0;
  border-top:var(--about-line);
}
.page-about .about-std__row{
  display:grid;
  gap:6px;
  padding:16px 0;
  border-bottom:var(--about-line);
}
.page-about .about-std__row dt{
  font-size:16px;
  font-weight:700;
  color:var(--paper-light);
}
.page-about .about-std__row dd{
  margin:0;
  display:flex;
  flex-wrap:wrap;
  gap:6px 16px;
  align-items:baseline;
}
.page-about .about-std__val{
  font-family:var(--font-mono);
  font-size:13.5px;
  letter-spacing:.05em;
  color:var(--tiger);
  white-space:nowrap;
}
.page-about .about-std__desc{
  flex:1 1 20em;
  font-size:14px;
  line-height:1.8;
  color:var(--mist);
}
.page-about .about-std__accordion{
  margin-top:22px;
  border:var(--about-line);
}
.page-about .about-std__accordion .accordion__item + .accordion__item{
  border-top:var(--about-line);
}
.page-about .about-std__accordion .accordion__trigger{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:14px 16px;
  background:var(--ink-800);
  border:0;
  color:var(--paper-light);
  font-family:var(--font-sans);
  font-size:14.5px;
  font-weight:600;
  text-align:left;
  cursor:pointer;
  transition:color var(--dur) var(--ease);
}
.page-about .about-std__accordion .accordion__trigger:hover{color:var(--ember);}
.page-about .about-std__accordion .accordion__chev{
  flex:0 0 auto;
  color:var(--tiger);
  font-size:16px;
  line-height:1;
  transition:transform var(--dur) var(--ease);
}
.page-about .about-std__accordion .accordion__trigger[aria-expanded="true"] .accordion__chev{
  transform:rotate(90deg);
}
.page-about .about-std__accordion .accordion__panel{
  display:grid;
  grid-template-rows:0fr;
  transition:grid-template-rows var(--dur) var(--ease);
  background:var(--ink-900);
}
.page-about .about-std__accordion .accordion__trigger[aria-expanded="true"] + .accordion__panel{
  grid-template-rows:1fr;
}
.page-about .about-std__accordion .accordion__body{
  overflow:hidden;
  min-height:0;
}
.page-about .about-std__accordion .accordion__body p{
  padding:0 16px 16px;
  font-size:14px;
  line-height:1.85;
  color:var(--mist);
  max-width:40em;
}

/* 合作生态 */
.page-about .about-eco{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:14px;
}
.page-about .about-eco__item{
  border-top:2px solid var(--teal);
  padding:16px 0 0;
}
.page-about .about-eco__item h3{
  font-size:17px;
  margin-bottom:8px;
}
.page-about .about-eco__item p{
  font-size:14px;
  line-height:1.85;
  color:var(--mist);
}
.page-about .about-eco__note{
  margin-top:26px;
  padding:20px 18px;
  border:var(--about-line);
  background:
    radial-gradient(circle at 92% 0%,rgba(59,140,255,.18) 0%,rgba(59,140,255,0) 62%),
    var(--ink-800);
}
.page-about .about-eco__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--teal);
  margin-bottom:10px;
}
.page-about .about-eco__note p:last-child{
  font-size:14.5px;
  line-height:1.9;
  color:var(--paper-light);
  max-width:44em;
}

/* 底部横幅 */
.page-about .about-banner{
  position:relative;
  margin:44px 0 0;
  border-top:1px solid var(--ink-700);
  border-bottom:1px solid var(--ink-700);
  overflow:hidden;
  background:var(--ink-800);
}
.page-about .about-banner img{
  width:100%;
  aspect-ratio:8/3;
  object-fit:cover;
}

/* 下一步 */
.page-about .about-next__grid{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:12px;
}
.page-about .about-next__card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:8px;
  padding:20px 18px;
  border:var(--about-line);
  background:var(--ink-800);
  color:var(--paper-light);
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.page-about .about-next__card:hover{
  text-decoration:none;
  border-color:var(--ember);
  background:var(--ink-900);
}
.page-about .about-next__k{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:var(--tiger);
}
.page-about .about-next__t{
  font-size:17px;
  font-weight:700;
  line-height:1.4;
}
.page-about .about-next__d{
  font-size:13.5px;
  line-height:1.8;
  color:var(--mist);
}

/* 平板与桌面 */
@media (min-width:640px){
  .page-about{--about-pad:28px;padding-top:26px;}
  .page-about .about-hero__facts{grid-template-columns:repeat(4,minmax(0,1fr));}
  .page-about .about-team__grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .page-about .about-eco{grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;}
  .page-about .about-next__grid{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (min-width:900px){
  .page-about{--about-pad:36px;padding-bottom:88px;}
  .page-about .about-hero{
    grid-template-columns:minmax(0,1.12fr) minmax(0,1fr);
    gap:40px;
    align-items:end;
    padding:46px 0 40px;
  }
  .page-about .about-hero__lead{font-size:17px;}
  .page-about .section-head{
    grid-template-columns:auto minmax(0,1fr) auto;
    align-items:baseline;
    gap:20px;
    padding-bottom:16px;
    margin-bottom:30px;
  }
  .page-about .section-head__note{text-align:right;}
  .page-about .about-section{padding-top:62px;}

  .page-about .about-cols{
    grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);
    gap:44px;
    align-items:start;
  }
  .page-about .about-text p,
  .page-about .about-text--wide{font-size:16.5px;}

  .page-about .about-team__grid{
    grid-template-columns:repeat(12,minmax(0,1fr));
    gap:16px;
  }
  .page-about .about-team__card:nth-child(1){grid-column:span 7;}
  .page-about .about-team__card:nth-child(2){grid-column:span 5;}
  .page-about .about-team__card:nth-child(3){grid-column:span 5;}
  .page-about .about-team__card:nth-child(4){grid-column:span 7;}
  .page-about .about-team__card{padding:26px 22px 22px;}
  .page-about .about-figure img{aspect-ratio:16/9;}

  .page-about .about-stage{
    grid-template-columns:88px minmax(0,1fr);
    gap:36px;
  }
  .page-about .about-stage__index{
    flex-direction:column;
    gap:2px;
    overflow:visible;
    padding-bottom:0;
    border-bottom:0;
    position:sticky;
    top:calc(var(--header-h) + 28px);
    align-self:start;
  }
  .page-about .about-stage__year{
    border:0;
    border-left:1px solid var(--ink-700);
    padding:7px 0 7px 12px;
    font-size:13px;
    background:none;
  }
  .page-about .about-stage__year:hover{border-left-color:var(--ember);border-color:var(--ember);}
  .page-about .about-stage__year.is-active{
    border-left:1px solid var(--tiger);
    border-color:var(--tiger);
  }
  .page-about .about-stage__list::before{left:5px;}
  .page-about .about-stage__item{padding-left:34px;padding-bottom:40px;}
  .page-about .about-stage__item h3{font-size:21px;}

  .page-about .about-std__row{
    grid-template-columns:172px minmax(0,1fr);
    gap:24px;
    align-items:baseline;
    padding:18px 0;
  }
  .page-about .about-std__row dd{flex-wrap:nowrap;}
  .page-about .about-std__val{min-width:9.5em;}

  .page-about .about-next__grid{grid-template-columns:repeat(4,minmax(0,1fr));}
  .page-about .about-banner{margin-top:62px;}
}

@media (min-width:1100px){
  .page-about .about-hero h1{font-size:56px;}
  .page-about .about-hero__facts .mono{font-size:26px;}
  .page-about .about-text p,
  .page-about .about-text--wide{font-size:17px;}
}

@media (prefers-reduced-motion:reduce){
  .page-about *,
  .page-about *::before,
  .page-about *::after{
    transition:none !important;
    animation:none !important;
  }
}
<<<END>>>