.page-about{
  --ab-hair: rgba(30,58,86,.16);
  --ab-hair-light: rgba(127,168,201,.34);
  background: var(--ice);
  color: var(--ink);
}

.page-about .ab-sec{
  padding-block: clamp(2.6rem,6vw,4.6rem);
}

.page-about .ab-head{
  max-width: 46rem;
}

.page-about .ab-head__title{
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(1.55rem,3.2vw,2.35rem);
  line-height: 1.22;
  letter-spacing: -.01em;
  margin: .55rem 0 0;
  color: var(--night);
}

.page-about .ab-head .measure,
.page-about p.measure{
  margin-top: .9rem;
  color: var(--rock);
  max-width: 34em;
}

/* ---------- 首屏 ---------- */
.page-about .about-top{
  position: relative;
  overflow: hidden;
  padding: clamp(1.4rem,3.5vw,2.4rem) 0 clamp(2.4rem,6vw,4.2rem);
  background-image:
    repeating-linear-gradient(90deg, rgba(18,38,58,.055) 0 1px, transparent 1px 94px),
    linear-gradient(180deg, rgba(201,162,39,.12), rgba(242,245,247,0) 62%);
}

.page-about .about-top .crumbs{
  margin-bottom: clamp(1.2rem,3vw,2rem);
}

.page-about .about-top__grid{
  display: grid;
  gap: clamp(1.6rem,4vw,2.6rem);
  align-items: start;
}

.page-about .about-top__lead h1{
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(2rem,5.4vw,3.5rem);
  line-height: 1.16;
  letter-spacing: -.012em;
  margin: .5rem 0 0;
  color: var(--night);
}

.page-about .about-top__lead .lede{
  margin-top: 1rem;
  color: var(--ink);
  max-width: 33em;
}

.page-about .about-top__figure{
  margin: 0;
  border: 1px solid var(--ab-hair);
  background: var(--dune);
}

.page-about .about-top__figure img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-top__figure .figure__cap{
  padding: .7rem .9rem .8rem;
  background: var(--ice);
  border-top: 1px solid var(--ab-hair);
  color: var(--rock);
  font-size: .82rem;
  line-height: 1.6;
}

.page-about .about-key{
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: .9rem 1.2rem;
  margin: clamp(1.5rem,4vw,2.2rem) 0 0;
  padding-top: 1.05rem;
  border-top: 1px solid var(--ab-hair);
}

.page-about .about-key dt{
  font-family: var(--font-latin);
  font-size: .7rem;
  letter-spacing: .14em;
  color: var(--rock);
  text-transform: uppercase;
}

.page-about .about-key dd{
  margin: .25rem 0 0;
  font-family: var(--font-latin);
  font-size: clamp(1.35rem,2.6vw,1.85rem);
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--night);
}

.page-about .about-key dd span{
  margin-left: .3em;
  font-family: var(--font-body);
  font-size: .78rem;
  letter-spacing: 0;
  color: var(--rock);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline{
  background: var(--ice);
}

.page-about .tl{
  position: relative;
  display: grid;
  gap: clamp(1.6rem,4vw,2.6rem);
  margin-top: clamp(1.8rem,4vw,2.8rem);
}

.page-about .tl::before{
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold-line), var(--ab-hair-light));
}

.page-about .tl__item{
  position: relative;
  padding-left: 2.1rem;
}

.page-about .tl__item::before{
  content: "";
  position: absolute;
  left: 0;
  top: .5rem;
  width: 11px;
  height: 11px;
  box-sizing: border-box;
  border: 1px solid var(--gold);
  background: var(--ice);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .tl__item:hover::before,
.page-about .tl__item:focus-within::before{
  background: var(--gold);
  transform: scale(1.15);
}

.page-about .tl__stage{
  margin: 0;
  font-family: var(--font-latin);
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--rock);
  text-transform: uppercase;
}

.page-about .tl__year{
  margin: .15rem 0 0;
  font-family: var(--font-latin);
  font-size: clamp(1.5rem,3.6vw,2.1rem);
  line-height: 1;
  letter-spacing: .04em;
  color: var(--night);
}

.page-about .tl__body h3{
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(1.15rem,2.2vw,1.4rem);
  line-height: 1.35;
  margin: 0 0 .5rem;
  color: var(--night);
}

.page-about .tl__body p{
  margin: 0 0 .65rem;
  color: var(--ink);
  max-width: 34em;
}

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

.page-about .tl__strip{
  margin: 0 0 0 2.1rem;
  border: 1px solid var(--ab-hair);
}

.page-about .tl__strip img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 5;
  object-fit: cover;
}

/* ---------- 团队 ---------- */
.page-about .about-team{
  background: var(--dune);
}

.page-about .team-grid{
  display: grid;
  gap: 1.1rem;
  margin-top: clamp(1.6rem,4vw,2.4rem);
}

.page-about .team__card{
  background: var(--ice);
  border-top: 3px solid var(--night);
  padding: clamp(1.1rem,2.4vw,1.6rem);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .team__card:hover,
.page-about .team__card:focus-within{
  border-top-color: var(--gold);
  transform: translateY(-4px);
}

.page-about .team__num{
  margin: 0;
  font-family: var(--font-latin);
  font-size: clamp(2rem,4vw,2.7rem);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--night);
}

.page-about .team__num span{
  margin-left: .25em;
  font-family: var(--font-body);
  font-size: .42em;
  color: var(--rock);
}

.page-about .team__card h3{
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.16rem;
  margin: .5rem 0 .5rem;
  color: var(--night);
}

.page-about .team__card p:last-child{
  margin: 0;
  color: var(--ink);
  font-size: .95rem;
  line-height: 1.8;
}

.page-about .team__figure{
  margin: 0;
  border: 1px solid var(--ab-hair);
  background: var(--ice);
}

.page-about .team__figure img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.page-about .team__figure .figure__cap{
  padding: .65rem .8rem .75rem;
  border-top: 1px solid var(--ab-hair);
  color: var(--rock);
  font-size: .8rem;
  line-height: 1.6;
}

/* ---------- 用户结构 ---------- */
.page-about .about-clients{
  background: var(--night);
  color: var(--ice);
}

.page-about .about-clients .ab-head__title{
  color: var(--ice);
}

.page-about .about-clients .measure{
  color: rgba(242,245,247,.74);
}

.page-about .ind__bar{
  display: flex;
  gap: 3px;
  height: clamp(44px,7vw,66px);
  margin-top: clamp(1.6rem,4vw,2.4rem);
}

.page-about .ind__seg{
  display: block;
  transition: filter var(--dur) var(--ease);
}

.page-about .ind__seg:hover{
  filter: brightness(1.18);
}

.page-about .ind__seg--1{ flex: 780 1 0; background: #C9A227; }
.page-about .ind__seg--2{ flex: 610 1 0; background: #D3B05A; }
.page-about .ind__seg--3{ flex: 430 1 0; background: #C7BF9B; }
.page-about .ind__seg--4{ flex: 350 1 0; background: #9FB4C4; }
.page-about .ind__seg--5{ flex: 430 1 0; background: #7FA8C9; }

.page-about .ind__keys{
  list-style: none;
  margin: clamp(1.2rem,3vw,1.7rem) 0 0;
  padding: 0;
  display: grid;
  gap: .85rem 1.4rem;
  grid-template-columns: repeat(auto-fit, minmax(160px,1fr));
}

.page-about .ind__keys li{
  display: flex;
  align-items: center;
  gap: .5rem;
  padding-top: .55rem;
  border-top: 1px solid var(--ab-hair-light);
  font-size: .9rem;
}

.page-about .ind__dot{
  width: 9px;
  height: 9px;
  flex: 0 0 auto;
}

.page-about .ind__dot--1{ background: #C9A227; }
.page-about .ind__dot--2{ background: #D3B05A; }
.page-about .ind__dot--3{ background: #C7BF9B; }
.page-about .ind__dot--4{ background: #9FB4C4; }
.page-about .ind__dot--5{ background: #7FA8C9; }

.page-about .ind__k{
  color: rgba(242,245,247,.82);
}

.page-about .ind__n{
  margin-left: auto;
  font-family: var(--font-latin);
  font-size: .92rem;
  letter-spacing: .04em;
  color: var(--gold);
  white-space: nowrap;
}

.page-about .ind__foot{
  margin: clamp(1.4rem,3.5vw,2rem) 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--ab-hair-light);
  color: rgba(242,245,247,.78);
  max-width: 40em;
  font-size: .95rem;
}

/* ---------- 资料维护 ---------- */
.page-about .about-library{
  background: var(--ice);
}

.page-about .lib-grid{
  display: grid;
  gap: clamp(1.6rem,4vw,2.8rem);
}

.page-about .lib-grid__lead p{
  margin: .9rem 0 0;
  color: var(--ink);
  max-width: 33em;
}

.page-about .doc-types{
  margin: 0;
}

.page-about .doc-types > div{
  display: grid;
  grid-template-columns: 5.4rem minmax(0,1fr);
  gap: .7rem;
  padding: .8rem 0;
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .doc-types > div:first-child{
  border-top: 1px solid var(--ab-hair);
}

.page-about .doc-types dt{
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: .98rem;
  color: var(--night);
  line-height: 1.5;
}

.page-about .doc-types dd{
  margin: 0;
  color: var(--rock);
  font-size: .92rem;
  line-height: 1.7;
}

/* ---------- 资质 ---------- */
.page-about .about-cred{
  background: var(--dune);
}

.page-about .cred{
  list-style: none;
  margin: clamp(1.6rem,4vw,2.4rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-hair);
}

.page-about .cred__item{
  display: grid;
  grid-template-columns: auto minmax(0,1fr);
  gap: 1rem;
  padding: clamp(1rem,2.6vw,1.5rem) clamp(.9rem,2.4vw,1.5rem);
  background: var(--ice);
}

.page-about .cred__no{
  font-family: var(--font-latin);
  font-size: 1rem;
  letter-spacing: .16em;
  color: var(--orange);
  line-height: 1.6;
}

.page-about .cred__item h3{
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.08rem;
  margin: 0 0 .35rem;
  color: var(--night);
}

.page-about .cred__item p{
  margin: 0;
  color: var(--rock);
  font-size: .93rem;
  line-height: 1.75;
  max-width: 40em;
}

/* ---------- 共建网络 ---------- */
.page-about .about-network{
  background: var(--ice);
}

.page-about .net-grid{
  display: grid;
  gap: clamp(1.6rem,4vw,2.6rem);
  align-items: start;
}

.page-about .net-grid__text p{
  margin: .9rem 0 0;
  color: var(--ink);
  max-width: 33em;
}

.page-about .net-grid__text a{
  color: var(--night);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease);
}

.page-about .net-grid__text a:hover{
  color: var(--orange);
}

.page-about .net-card{
  background: var(--night);
  color: var(--ice);
  padding: clamp(1.2rem,3vw,1.8rem);
}

.page-about .net-card__row{
  padding: .9rem 0;
  border-bottom: 1px solid var(--night-mid);
}

.page-about .net-card__row:first-child{
  padding-top: 0;
}

.page-about .net-card__num{
  margin: 0;
  font-family: var(--font-latin);
  font-size: clamp(2.2rem,5vw,3rem);
  line-height: 1;
  letter-spacing: .03em;
  color: var(--gold);
}

.page-about .net-card__label{
  margin: .35rem 0 0;
  color: rgba(242,245,247,.8);
  font-size: .92rem;
  line-height: 1.7;
}

.page-about .net-card__note{
  margin: 1rem 0 0;
  color: var(--crack);
  font-size: .86rem;
  line-height: 1.7;
}

/* ---------- 下一步 ---------- */
.page-about .about-next{
  background: var(--ice);
  padding-top: 0;
}

.page-about .next-links{
  list-style: none;
  margin: clamp(1.3rem,3.5vw,2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px,1fr));
}

.page-about .next-links a{
  display: block;
  padding: 1.1rem 0 1.2rem;
  border-top: 2px solid var(--night);
  text-decoration: none;
  color: var(--ink);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .next-links a:hover{
  border-top-color: var(--gold);
  transform: translateY(-3px);
}

.page-about .next__k{
  display: block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.12rem;
  color: var(--night);
}

.page-about .next__d{
  display: block;
  margin-top: .4rem;
  color: var(--rock);
  font-size: .9rem;
  line-height: 1.7;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px){
  .page-about .about-key{
    grid-template-columns: repeat(4, minmax(0,1fr));
  }
}

@media (min-width: 760px){
  .page-about .tl__item{
    display: grid;
    grid-template-columns: 6.2rem minmax(0,1fr);
    column-gap: clamp(1rem,3vw,2.2rem);
    row-gap: .2rem;
    padding-left: 2.6rem;
  }

  .page-about .tl__stage{
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .tl__year{
    grid-column: 1;
    grid-row: 2;
  }

  .page-about .tl__body{
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .page-about .tl__strip{
    margin-left: 2.6rem;
  }

  .page-about .tl__item--bleed{
    background: var(--night);
    margin-right: calc(-1 * clamp(.8rem,3vw,2.4rem));
    padding: clamp(1.3rem,3vw,1.9rem) clamp(1.1rem,3vw,1.9rem) clamp(1.3rem,3vw,1.9rem) 2.6rem;
  }

  .page-about .tl__item--bleed .tl__stage{
    color: var(--crack);
  }

  .page-about .tl__item--bleed .tl__year{
    color: var(--gold);
  }

  .page-about .tl__item--bleed .tl__body h3{
    color: var(--ice);
  }

  .page-about .tl__item--bleed .tl__body p{
    color: rgba(242,245,247,.82);
  }

  .page-about .tl__item--bleed::before{
    background: var(--night);
  }

  .page-about .team-grid{
    grid-template-columns: 5fr 4fr 3fr;
  }

  .page-about .team__figure{
    grid-column: 1 / -1;
  }

  .page-about .team__figure img{
    aspect-ratio: 16 / 7;
  }

  .page-about .lib-grid{
    grid-template-columns: minmax(0,.95fr) minmax(0,1.05fr);
    align-items: start;
  }

  .page-about .net-grid{
    grid-template-columns: minmax(0,1.35fr) minmax(0,.65fr);
  }
}

@media (min-width: 900px){
  .page-about .about-top__grid{
    grid-template-columns: minmax(0,1.12fr) minmax(0,.88fr);
    align-items: start;
  }

  .page-about .about-top__figure{
    margin-right: calc(-1 * clamp(.5rem,3vw,2.6rem));
  }

  .page-about .about-top__lead h1{
    max-width: 15em;
  }
}

@media (min-width: 1040px){
  .page-about .team-grid{
    grid-template-columns: 5fr 4fr 3fr 22%;
    align-items: stretch;
  }

  .page-about .team__figure{
    grid-column: auto;
    grid-row: 1;
  }

  .page-about .team__figure img{
    aspect-ratio: 4 / 5;
    height: 100%;
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .team__card,
  .page-about .next-links a,
  .page-about .tl__item::before{
    transition: none;
  }

  .page-about .team__card:hover,
  .page-about .team__card:focus-within,
  .page-about .next-links a:hover{
    transform: none;
  }
}
<<<END>>>