.page-about{
  --pa-gap:clamp(36px,6vw,88px);
  --pa-top:104px;
  --pa-soft:linear-gradient(155deg,rgba(12,36,54,.94),rgba(6,23,38,.58));
  color:var(--text);
}

.page-about .crumb{padding-top:clamp(96px,13vh,140px);}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(26px,4vw,48px);
  padding:clamp(22px,3.4vw,40px) 0 clamp(34px,5.5vw,70px);
}
.page-about .about-hero h1{
  font-family:var(--serif);
  font-weight:700;
  letter-spacing:-.02em;
  font-size:clamp(30px,4.4vw,54px);
  line-height:1.16;
  margin:14px 0 20px;
}
.page-about .about-hero__lead{
  margin:0;
  max-width:60ch;
  font-size:clamp(15px,1.1vw,17px);
  line-height:1.85;
  color:var(--muted);
}
.page-about .about-hero__cta{
  display:flex;
  flex-wrap:wrap;
  gap:14px;
  margin-top:clamp(22px,3vw,34px);
}
.page-about .about-hero__card{
  position:relative;
  overflow:hidden;
  background:var(--pa-soft);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  padding:clamp(20px,2.4vw,32px);
}
.page-about .about-hero__card::after{
  content:"";
  position:absolute;
  right:-70px;
  bottom:-90px;
  width:230px;
  height:230px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(79,227,208,.20),rgba(79,227,208,0) 70%);
  pointer-events:none;
}
.page-about .about-hero__cardtitle{
  margin:0 0 16px;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--muted);
  text-transform:uppercase;
}
.page-about .about-meta{margin:0;}
.page-about .about-meta__row{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:14px;
  padding:9px 0;
  border-bottom:1px dashed var(--line);
}
.page-about .about-meta__row:last-child{border-bottom:0;padding-bottom:0;}
.page-about .about-meta dt{
  font-size:14px;
  color:var(--muted);
  letter-spacing:.02em;
}
.page-about .about-meta dd{
  margin:0;
  font-size:17px;
  color:var(--gold);
  letter-spacing:-.02em;
}

@media (min-width:920px){
  .page-about .about-hero{
    grid-template-columns:minmax(0,1.32fr) minmax(300px,.82fr);
    align-items:end;
  }
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(26px,4vw,46px);
  padding-bottom:clamp(50px,8vw,110px);
}
.page-about .about-main{min-width:0;}

/* ---------- 左侧章节索引 ---------- */
.page-about .rail{
  border-left:0;
  border-bottom:1px solid var(--line);
  padding:0 0 14px;
}
.page-about .rail__title{
  margin:0 0 12px;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--muted);
}
.page-about .rail__list{
  display:flex;
  flex-direction:row;
  gap:8px;
  margin:0;
  padding:0 0 4px;
  list-style:none;
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
}
.page-about .rail__link{
  display:block;
  white-space:nowrap;
  padding:8px 14px;
  border:1px solid var(--line);
  border-radius:var(--pill);
  color:var(--muted);
  font-size:14px;
  text-decoration:none;
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.page-about .rail__link:hover{
  color:var(--text);
  background:rgba(79,227,208,.08);
  border-color:rgba(79,227,208,.4);
}
.page-about .rail__link[aria-current="true"]{
  background:rgba(79,227,208,.14);
  border-color:rgba(79,227,208,.55);
  color:var(--cyan);
}

@media (min-width:1040px){
  .page-about .about-shell{
    grid-template-columns:236px minmax(0,1fr);
    gap:clamp(40px,5vw,72px);
  }
  .page-about .rail{
    position:sticky;
    top:calc(var(--pa-top) + 18px);
    align-self:start;
    border-bottom:0;
    border-left:1px solid var(--line);
    padding:4px 0 4px 18px;
    max-height:calc(100vh - var(--pa-top) - 44px);
    overflow:auto;
  }
  .page-about .rail__list{
    flex-direction:column;
    overflow:visible;
    gap:4px;
  }
  .page-about .rail__link{
    border-color:transparent;
    border-radius:var(--pill);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-block{
  padding:clamp(30px,4.6vw,62px) 0;
  border-top:1px solid var(--line);
}
.page-about .about-block:first-child{
  border-top:0;
  padding-top:0;
}
.page-about .about-head h2{
  font-family:var(--serif);
  font-weight:700;
  font-size:clamp(23px,2.7vw,38px);
  line-height:1.26;
  letter-spacing:-.015em;
  margin:10px 0 14px;
}
.page-about .about-head__lead{
  margin:0;
  max-width:64ch;
  color:var(--muted);
  font-size:16px;
  line-height:1.85;
}
.page-about .about-more{
  margin:26px 0 0;
  padding-left:16px;
  border-left:2px solid var(--cyan);
  color:var(--muted);
  font-size:15px;
  line-height:1.85;
}
.page-about .about-more a{
  color:var(--cyan);
  text-decoration:none;
  border-bottom:1px solid rgba(79,227,208,.4);
}
.page-about .about-more a:hover{color:var(--text);}

/* ---------- 图片容器 ---------- */
.page-about .figure{margin:clamp(24px,3.5vw,40px) 0 0;}
.page-about .figure__frame{
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  background:linear-gradient(140deg,rgba(12,36,54,.9),rgba(6,23,38,.7));
}
.page-about .figure__img{
  display:block;
  width:100%;
  max-width:100%;
  height:auto;
  object-fit:cover;
}
.page-about .figure__caption{
  margin:12px 2px 0;
  color:var(--muted);
  font-size:13px;
  line-height:1.7;
}

/* ---------- 团队分组 ---------- */
.page-about .tm{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:16px;
  margin-top:clamp(24px,3.4vw,36px);
}
.page-about .tm-card{
  background:var(--pa-soft);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  padding:clamp(20px,2.2vw,30px);
  transition:border-color .25s ease,transform .25s ease;
}
.page-about .tm-card:hover,
.page-about .tm-card:focus-within{
  border-color:rgba(79,227,208,.5);
  transform:translateY(-3px);
}
.page-about .tm-card__idx{
  margin:0 0 12px;
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.18em;
  color:var(--teal);
}
.page-about .tm-card__name{
  margin:0 0 8px;
  font-size:20px;
  font-weight:600;
  letter-spacing:.01em;
}
.page-about .tm-card__num{
  margin:0;
  color:var(--muted);
  font-size:13px;
  letter-spacing:.06em;
}
.page-about .tm-card__desc{
  margin:14px 0 0;
  color:var(--muted);
  font-size:14.5px;
  line-height:1.85;
}
.page-about .tm-card__more{
  margin:14px 0 0;
  color:var(--cyan);
  font-size:13.5px;
  line-height:1.7;
}
@media (hover:hover) and (min-width:860px){
  .page-about .tm-card__more{
    max-height:0;
    margin-top:0;
    opacity:0;
    overflow:hidden;
    transition:max-height .32s ease,opacity .32s ease,margin-top .32s ease;
  }
  .page-about .tm-card:hover .tm-card__more,
  .page-about .tm-card:focus-within .tm-card__more{
    max-height:140px;
    margin-top:14px;
    opacity:1;
  }
}
@media (min-width:880px){
  .page-about .tm{
    grid-template-columns:1.12fr .96fr .82fr;
    align-items:start;
  }
}

/* ---------- 版本时间轴 ---------- */
.page-about .tl-years{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin:clamp(24px,3vw,34px) 0 8px;
}
.page-about .tl-year{
  display:inline-block;
  padding:7px 18px;
  border-radius:var(--pill);
  border:1px solid rgba(140,107,255,.45);
  background:rgba(140,107,255,.10);
  color:var(--violet);
  font-family:var(--mono);
  font-size:13.5px;
  letter-spacing:.04em;
  text-decoration:none;
  transition:background .2s ease,color .2s ease;
}
.page-about .tl-year:hover{
  background:rgba(140,107,255,.22);
  color:var(--text);
}
.page-about .tl{
  margin:0;
  padding:0;
  list-style:none;
}
.page-about .tl__item{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:8px;
  padding:20px 0;
  border-bottom:1px dashed var(--line);
}
.page-about .tl__year{
  margin:0;
  font-family:var(--mono);
  font-size:clamp(19px,2.1vw,28px);
  letter-spacing:-.02em;
  color:var(--gold);
}
.page-about .tl__title{
  margin:0 0 8px;
  font-size:16.5px;
  font-weight:600;
  line-height:1.5;
}
.page-about .tl__text{
  margin:0;
  color:var(--muted);
  font-size:14.5px;
  line-height:1.85;
}
.page-about .tl__tags{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-top:12px;
}
.page-about .tl-spark{
  display:block;
  width:100%;
  height:auto;
  margin-top:clamp(24px,3.4vw,38px);
}
@media (min-width:720px){
  .page-about .tl__item{
    grid-template-columns:132px minmax(0,1fr);
    gap:26px;
    align-items:baseline;
  }
}

/* ---------- 收录条件 ---------- */
.page-about .vd{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:20px;
  margin-top:clamp(24px,3.4vw,34px);
}
.page-about .vd__item{
  padding:4px 0 4px 20px;
  border-left:2px solid var(--grid);
}
.page-about .vd__item h3{
  margin:0 0 8px;
  font-size:16px;
  font-weight:600;
  line-height:1.5;
}
.page-about .vd__item p{
  margin:0;
  color:var(--muted);
  font-size:14.5px;
  line-height:1.85;
}
.page-about .vd-tags{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:26px;
}
@media (min-width:780px){
  .page-about .vd{grid-template-columns:repeat(2,minmax(0,1fr));column-gap:clamp(24px,4vw,56px);}
}

/* ---------- 服务范围 ---------- */
.page-about .cov-faqs{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:14px;
  margin-top:clamp(24px,3.4vw,34px);
}
.page-about .cov-faq{
  background:var(--pa-soft);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  padding:18px 20px;
}
.page-about .cov-faq__n{
  margin:0 0 8px;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--gold);
}
.page-about .cov-faq__t{
  margin:0;
  font-size:15px;
  line-height:1.7;
}
.page-about .cov{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  margin:clamp(24px,3.4vw,36px) 0 0;
  padding:0;
  list-style:none;
  border-top:1px solid var(--line);
}
.page-about .cov__row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:12px 0;
  border-bottom:1px solid var(--line);
}
.page-about .cov__city{
  font-size:15px;
  letter-spacing:.04em;
  color:var(--text);
}
@media (min-width:640px){
  .page-about .cov{grid-template-columns:repeat(2,minmax(0,1fr));column-gap:clamp(24px,4vw,60px);}
}
@media (min-width:820px){
  .page-about .cov-faqs{grid-template-columns:repeat(3,minmax(0,1fr));}
}

/* ---------- 双端对照 ---------- */
.page-about .dual{
  margin-top:clamp(24px,3.4vw,36px);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  overflow:hidden;
  background:rgba(12,36,54,.42);
}
.page-about .dual__row{
  display:grid;
  grid-template-columns:minmax(0,1fr);
}
.page-about .dual__row + .dual__row{border-top:1px solid var(--line);}
.page-about .dual__cell{
  padding:14px 18px;
  font-size:14.5px;
  line-height:1.75;
  color:var(--muted);
}
.page-about .dual__cell--head{
  background:rgba(12,36,54,.9);
  color:var(--text);
  font-family:var(--mono);
  font-size:12.5px;
  letter-spacing:.12em;
  font-weight:600;
}
.page-about .dual__cell--key{
  font-family:var(--mono);
  font-size:12.5px;
  letter-spacing:.1em;
  color:var(--cyan);
  padding-bottom:0;
}
@media (min-width:760px){
  .page-about .dual__row{
    grid-template-columns:minmax(150px,.9fr) minmax(0,1fr) minmax(0,1fr);
  }
  .page-about .dual__cell--key{
    padding:16px 18px;
    color:var(--cyan);
    font-size:13px;
  }
  .page-about .dual__row:not(.dual__row--head) .dual__cell--key{
    background:rgba(79,227,208,.05);
    color:var(--text);
    font-family:var(--sans);
    font-size:14.5px;
    letter-spacing:0;
  }
  .page-about .dual__cell + .dual__cell{border-left:1px solid var(--line);}
}

/* ---------- 内容共建 ---------- */
.page-about .steps{
  counter-reset:pa-step;
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:14px;
  margin:clamp(24px,3.4vw,36px) 0 0;
  padding:0;
  list-style:none;
}
.page-about .steps li{
  position:relative;
  padding:18px 20px 18px 64px;
  background:var(--pa-soft);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  color:var(--muted);
  font-size:14.5px;
  line-height:1.85;
}
.page-about .steps li::before{
  counter-increment:pa-step;
  content:counter(pa-step,decimal-leading-zero);
  position:absolute;
  left:20px;
  top:18px;
  font-family:var(--mono);
  font-size:14px;
  color:var(--violet);
  letter-spacing:.04em;
}
.page-about .steps strong{color:var(--text);font-weight:600;}
.page-about .steps a{
  color:var(--cyan);
  text-decoration:none;
  border-bottom:1px solid rgba(79,227,208,.4);
}
.page-about .steps a:hover{color:var(--text);}
.page-about .join-note{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:18px;
  margin-top:26px;
  padding:22px clamp(18px,2.4vw,28px);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  background:linear-gradient(150deg,rgba(242,184,91,.10),rgba(6,23,38,.5));
}
.page-about .join-note p{
  margin:0;
  max-width:62ch;
  color:var(--muted);
  font-size:14.5px;
  line-height:1.85;
}
.page-about .join-note a{color:var(--cyan);text-decoration:none;border-bottom:1px solid rgba(79,227,208,.4);}
.page-about .join-note a:hover{color:var(--text);}
@media (min-width:760px){
  .page-about .join-note{flex-direction:row;align-items:center;justify-content:space-between;gap:28px;}
  .page-about .join-note p{flex:1 1 auto;}
  .page-about .join-note .btn{flex:0 0 auto;}
}

@media (prefers-reduced-motion:reduce){
  .page-about .tm-card,
  .page-about .rail__link,
  .page-about .tl-year{transition:none;}
  .page-about .tm-card:hover,
  .page-about .tm-card:focus-within{transform:none;}
}
<<<END>>>