.page-about{
  --about-year-w:56px;
  --about-line-x:27px;
  background:var(--pitch);
  color:var(--white);
  padding-bottom:clamp(48px,7vw,96px);
}

/* 页头 */
.page-about .about-head{
  padding-block:clamp(24px,3.6vw,48px) clamp(8px,1.4vw,16px);
}
.page-about .breadcrumbs{
  margin-bottom:clamp(20px,3vw,34px);
}
.page-about .about-title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(34px,7vw,80px);
  line-height:.98;
  letter-spacing:-.015em;
  margin:0 0 clamp(16px,2.4vw,26px);
  max-width:16ch;
}
.page-about .about-lead{
  max-width:64ch;
  margin:0;
  color:var(--mist);
  font-size:clamp(15px,1.6vw,17px);
  line-height:1.85;
}

/* 首图 */
.page-about .about-hero{
  margin:clamp(24px,4vw,44px) 0 0;
  border:1px solid var(--line-strong);
  padding:8px;
  background:var(--pitch-2);
}
.page-about .about-hero__img{
  display:block;
  width:100%;
  height:auto;
  aspect-ratio:16/9;
  object-fit:cover;
  filter:saturate(.92) contrast(1.04);
}
.page-about .about-hero__cap{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--mist);
  padding:10px 2px 2px;
  border-top:1px solid var(--line);
  margin-top:8px;
}

/* 目录 */
.page-about .about-toc{
  margin-top:clamp(26px,4vw,48px);
  padding-block:clamp(18px,2.6vw,28px);
  border-top:1px solid var(--line-strong);
  border-bottom:1px solid var(--line);
}
.page-about .about-toc__label{
  margin:0 0 12px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.page-about .about-toc__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  grid-template-columns:1fr;
  gap:2px;
}
.page-about .about-toc__list a{
  display:flex;
  align-items:baseline;
  gap:12px;
  padding:10px 10px;
  border:1px solid transparent;
  color:var(--white);
  text-decoration:none;
  font-size:15px;
  line-height:1.4;
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible{
  background:var(--pitch-2);
  border-color:var(--line-strong);
  color:var(--cyan);
  outline:none;
}
.page-about .about-toc__num{
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--mist);
  flex:0 0 auto;
}
.page-about .about-toc__list a:hover .about-toc__num,
.page-about .about-toc__list a:focus-visible .about-toc__num{
  color:var(--cyan);
}

/* 区块骨架 */
.page-about .about-sec{
  padding-block:clamp(34px,5vw,68px);
  border-bottom:1px solid var(--line);
  scroll-margin-top:120px;
}
.page-about .about-sec__head{
  display:flex;
  align-items:center;
  gap:12px;
  margin-bottom:clamp(18px,2.6vw,30px);
}
.page-about .about-sec__idx{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--cyan);
  border:1px solid var(--line-strong);
  padding:3px 7px;
}
.page-about .about-sec__head .section-title{
  margin:0;
  font-size:clamp(22px,3.6vw,36px);
  line-height:1.15;
}

/* 双栏 */
.page-about .about-cols{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(22px,3.4vw,40px);
}
.page-about .about-body{
  font-size:15px;
  line-height:1.85;
  color:var(--mist);
  max-width:66ch;
}
.page-about .about-body p{
  margin:0 0 14px;
}
.page-about .about-body p:last-child{
  margin-bottom:0;
}
.page-about .about-body--wide{
  max-width:70ch;
  margin:0 0 clamp(22px,3vw,34px);
}
.page-about .about-side{
  min-width:0;
}
.page-about .about-side .note{
  border-left:2px solid var(--cyan);
  padding-left:14px;
  color:var(--mist);
  font-size:13px;
  line-height:1.7;
}
.page-about .about-side .note p{
  margin:0 0 10px;
}
.page-about .about-side .note p:last-child{
  margin-bottom:0;
}

/* 配图 */
.page-about .about-fig{
  margin:0;
  border:1px solid var(--line-strong);
  padding:6px;
  background:var(--pitch-2);
}
.page-about .about-fig img{
  display:block;
  width:100%;
  height:auto;
  object-fit:cover;
  filter:saturate(.9) contrast(1.05);
}
.page-about .about-fig figcaption{
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.6;
  color:var(--mist);
  padding:8px 2px 2px;
  border-top:1px solid var(--line);
  margin-top:8px;
}
.page-about .about-fig--tall{
  max-width:420px;
  margin-top:clamp(20px,3vw,32px);
}

/* 编年线 */
.page-about .about-timeline-wrap{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(20px,3vw,36px);
  align-items:start;
}
.page-about .timeline{
  list-style:none;
  margin:0;
  padding:0;
  position:relative;
}
.page-about .timeline::before{
  content:"";
  position:absolute;
  left:var(--about-line-x);
  top:8px;
  bottom:8px;
  width:1px;
  background:linear-gradient(to bottom,var(--cyan),rgba(77,163,255,.5),rgba(221,231,226,.12));
}
.page-about .timeline__item{
  position:relative;
  display:grid;
  grid-template-columns:var(--about-year-w) minmax(0,1fr);
  gap:14px;
  padding-bottom:clamp(20px,2.8vw,32px);
}
.page-about .timeline__item:last-child{
  padding-bottom:0;
}
.page-about .timeline__year{
  justify-self:start;
  position:relative;
  z-index:1;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--pitch);
  background:var(--cyan);
  padding:4px 6px;
}
.page-about .timeline__body h3{
  margin:0 0 6px;
  font-size:17px;
  line-height:1.35;
  color:var(--white);
  font-weight:700;
}
.page-about .timeline__body p{
  margin:0;
  font-size:14px;
  line-height:1.8;
  color:var(--mist);
}

/* 团队 */
.page-about .team-strip{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1px;
  background:var(--line);
  border:1px solid var(--line-strong);
  margin-bottom:clamp(22px,3.4vw,36px);
}
.page-about .team-cell{
  background:var(--pitch-2);
  padding:clamp(14px,2.4vw,24px);
}
.page-about .team-cell__num{
  display:block;
  font-family:var(--font-mono);
  font-size:clamp(30px,5vw,46px);
  font-weight:700;
  line-height:1;
  color:var(--cyan);
}
.page-about .team-cell__label{
  display:block;
  margin-top:8px;
  font-size:12px;
  line-height:1.6;
  color:var(--mist);
}

/* 节奏 */
.page-about .rhythm{
  margin:0 0 clamp(24px,3.4vw,36px);
  display:grid;
  gap:0;
}
.page-about .rhythm__row{
  display:grid;
  gap:4px;
  padding:14px 0;
  border-top:1px solid var(--line);
}
.page-about .rhythm__row:last-child{
  border-bottom:1px solid var(--line);
}
.page-about .rhythm__row dt{
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  color:var(--cyan);
  letter-spacing:.02em;
}
.page-about .rhythm__row dd{
  margin:0;
  font-size:14px;
  line-height:1.8;
  color:var(--mist);
}

.page-about .about-sub{
  font-size:15px;
  letter-spacing:.08em;
  color:var(--white);
  margin:0 0 14px;
  padding-bottom:8px;
  border-bottom:1px solid var(--line-strong);
}
.page-about .columns-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:12px;
}
.page-about .columns-list li{
  display:grid;
  gap:3px;
  padding-left:12px;
  border-left:2px solid var(--blue);
}
.page-about .columns-list strong{
  font-size:14px;
  color:var(--white);
  font-weight:700;
}
.page-about .columns-list span{
  font-size:13px;
  line-height:1.7;
  color:var(--mist);
}

/* 合作卡片 */
.page-about .coop{
  display:grid;
  grid-template-columns:1fr;
  gap:14px;
  margin-top:clamp(20px,3vw,32px);
}
.page-about .coop-card{
  display:block;
  padding:clamp(18px,2.6vw,26px);
  background:var(--pitch-2);
  border:1px solid var(--line-strong);
  border-left:3px solid var(--cyan);
  text-decoration:none;
  color:var(--white);
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.page-about .coop-card:nth-child(2){
  border-left-color:var(--orange);
}
.page-about .coop-card:hover,
.page-about .coop-card:focus-visible{
  background:var(--pitch-3);
  border-color:var(--cyan);
  transform:translateY(-2px);
  outline:none;
}
.page-about .coop-card h3{
  margin:12px 0 8px;
  font-size:19px;
  color:var(--white);
}
.page-about .coop-card p{
  margin:0 0 14px;
  font-size:14px;
  line-height:1.8;
  color:var(--mist);
}
.page-about .coop-card__go{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--cyan);
  border-bottom:1px solid rgba(47,243,208,.4);
  padding-bottom:2px;
}

/* 继续翻阅 */
.page-about .about-next{
  padding-top:clamp(30px,4.6vw,60px);
}
.page-about .about-next__links{
  display:grid;
  grid-template-columns:1fr;
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.page-about .about-next__links a{
  display:flex;
  align-items:baseline;
  gap:12px;
  padding:clamp(14px,2.2vw,20px);
  background:var(--pitch);
  text-decoration:none;
  color:var(--white);
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease);
}
.page-about .about-next__links a:hover,
.page-about .about-next__links a:focus-visible{
  background:var(--pitch-2);
  color:var(--cyan);
  outline:none;
}
.page-about .about-next__num{
  font-family:var(--font-mono);
  color:var(--cyan);
  font-size:14px;
  flex:0 0 auto;
}
.page-about .about-next__txt{
  display:flex;
  flex-direction:column;
  gap:4px;
  font-size:15px;
  font-weight:600;
}
.page-about .about-next__txt em{
  font-style:normal;
  font-size:12px;
  font-weight:400;
  color:var(--mist);
  line-height:1.6;
}

/* 桌面 */
@media (min-width:880px){
  .page-about{
    --about-year-w:92px;
    --about-line-x:27px;
  }

  .page-about .about-toc__list{
    grid-template-columns:repeat(3,minmax(0,1fr));
    gap:2px 10px;
  }

  .page-about .about-cols{
    grid-template-columns:minmax(0,1.55fr) minmax(0,1fr);
    gap:clamp(30px,4.5vw,64px);
  }
  .page-about .about-cols--rev{
    grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);
  }
  .page-about .about-body{
    font-size:16px;
  }

  .page-about .about-timeline-wrap{
    grid-template-columns:minmax(0,1fr) 340px;
    gap:clamp(36px,5vw,64px);
  }
  .page-about .about-fig--tall{
    margin-top:0;
    max-width:none;
  }

  .page-about .team-strip{
    grid-template-columns:repeat(4,minmax(0,1fr));
  }

  .page-about .rhythm__row{
    grid-template-columns:180px minmax(0,1fr);
    gap:clamp(16px,2vw,32px);
    align-items:baseline;
  }

  .page-about .columns-list{
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:16px 28px;
  }

  .page-about .coop{
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:20px;
  }

  .page-about .about-next__links{
    grid-template-columns:repeat(3,minmax(0,1fr));
  }
}

@media (min-width:1180px){
  .page-about .about-toc__list{
    grid-template-columns:repeat(6,minmax(0,1fr));
  }
}

@media (prefers-reduced-motion:reduce){
  .page-about .coop-card,
  .page-about .about-toc__list a,
  .page-about .about-next__links a{
    transition:none;
  }
  .page-about .coop-card:hover,
  .page-about .coop-card:focus-visible{
    transform:none;
  }
}
<<<END>>>