.page-about{
  --about-rail:200px;
  --about-gap:clamp(24px,4vw,64px);
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  overflow-x:hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position:relative;
  overflow:hidden;
  background:var(--navy);
  color:var(--paper);
  padding:calc(var(--header-h) + 40px) 0 0;
}
.page-about .about-hero::before{
  content:"";
  position:absolute;
  top:-14%;
  right:-22%;
  width:min(88vw,780px);
  aspect-ratio:1 / 1;
  background:linear-gradient(150deg,rgba(217,154,61,.34),rgba(181,83,60,.16) 58%,rgba(19,41,61,0) 100%);
  clip-path:polygon(100% 0,100% 100%,2% 0);
  pointer-events:none;
}
.page-about .about-hero .wrap{
  position:relative;
  z-index:1;
}
.page-about .about-hero__grid{
  display:grid;
  gap:clamp(28px,5vw,52px);
  align-items:end;
}
.page-about .about-hero .breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  gap:6px 10px;
  list-style:none;
  margin:0 0 20px;
  padding:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
}
.page-about .about-hero .breadcrumb__link{
  color:var(--gray-blue);
  text-decoration:none;
}
.page-about .about-hero .breadcrumb__link:hover{
  color:var(--amber-soft);
}
.page-about .about-hero .breadcrumb__current{
  color:var(--paper);
}
.page-about .about-hero .eyebrow{
  margin:0;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.22em;
  color:var(--amber);
}
.page-about .about-hero__title{
  margin:.3em 0 0;
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(34px,6.6vw,66px);
  line-height:1.1;
  letter-spacing:-.02em;
  color:var(--paper);
}
.page-about .about-hero__title em{
  font-style:normal;
  color:var(--amber-soft);
  box-shadow:inset 0 -6px 0 rgba(217,154,61,.42);
}
.page-about .about-hero__desc{
  max-width:36ch;
  margin:22px 0 0;
  font-size:clamp(15px,1.6vw,17px);
  line-height:1.9;
  color:rgba(244,239,230,.86);
}
.page-about .about-hero__meta{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:24px 0 0;
}
.page-about .about-hero__meta .tag{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  padding:5px 10px;
  border:1px solid var(--line-paper);
  color:var(--gray-blue);
}
.page-about .about-hero__meta .tag--amber{
  color:var(--navy-deep);
  background:var(--amber-soft);
  border-color:var(--amber-soft);
}

.page-about .about-hero__tabs-title{
  margin:0 0 12px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  color:var(--slate);
}
.page-about .about-tabs{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:8px;
}
.page-about .about-tabs__link{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:12px;
  align-items:baseline;
  padding:11px 14px;
  border:1px solid var(--line-paper);
  border-left:3px solid var(--amber);
  background:rgba(244,239,230,.05);
  color:var(--paper);
  text-decoration:none;
  font-size:14px;
  line-height:1.5;
  transition:background .25s var(--ease),transform .25s var(--ease),border-color .25s var(--ease);
}
.page-about .about-tabs__no{
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--amber);
}
.page-about .about-tabs__link:hover,
.page-about .about-tabs__link:focus-visible{
  background:rgba(244,239,230,.13);
  border-left-color:var(--amber-soft);
  transform:translateX(4px);
}

.page-about .about-hero__media{
  margin:clamp(36px,6vw,64px) 0 0;
}
.page-about .figure{
  margin:0;
}
.page-about .figure__frame{
  overflow:hidden;
  border:1px solid var(--line-strong);
  background:var(--paper-deep);
}
.page-about .figure__img{
  display:block;
  width:100%;
  max-width:100%;
  height:100%;
  object-fit:cover;
}
.page-about .figure__caption{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.7;
  color:var(--slate);
}
.page-about .about-hero__media .figure__frame{
  border-color:rgba(244,239,230,.28);
}
.page-about .about-hero__media .figure__caption{
  color:var(--gray-blue);
  padding-bottom:clamp(28px,4vw,44px);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter{
  padding:clamp(46px,7vw,88px) 0;
  border-top:1px solid var(--line);
}
.page-about .chapter--tint{
  background:linear-gradient(180deg,var(--paper-deep),rgba(232,220,200,.55));
}
.page-about .chapter__inner{
  display:grid;
  gap:clamp(22px,3.5vw,42px);
}
.page-about .chapter__num{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--red);
}
.page-about .chapter__title{
  margin:.35em 0 0;
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(25px,3.6vw,40px);
  line-height:1.24;
  letter-spacing:-.01em;
  color:var(--navy);
}
.page-about .chapter__note{
  margin:16px 0 0;
  padding:10px 12px;
  border-left:3px solid var(--amber);
  background:rgba(244,239,230,.75);
  font-family:var(--font-mono);
  font-size:12.5px;
  line-height:1.75;
  color:var(--teal);
}
.page-about .lead-line{
  margin:0 0 26px;
  font-size:clamp(15px,1.65vw,17px);
  line-height:1.95;
  color:rgba(15,20,23,.84);
  max-width:62ch;
}
.page-about .foot-note{
  margin:26px 0 0;
  padding-left:14px;
  border-left:2px solid var(--line-strong);
  font-size:14px;
  line-height:1.85;
  color:var(--slate);
  max-width:62ch;
}
.page-about .text-link{
  color:var(--red);
  text-decoration:none;
  border-bottom:1px solid rgba(181,83,60,.45);
  padding-bottom:1px;
}
.page-about .text-link:hover{
  border-bottom-color:var(--red);
}
.page-about .text-link--light{
  color:var(--amber-soft);
  border-bottom-color:rgba(240,201,135,.5);
}

/* ---------- 01 平台定位 ---------- */
.page-about .who-grid{
  display:grid;
  gap:16px;
}
.page-about .who-card{
  position:relative;
  padding:22px 20px 18px;
  background:var(--paper);
  border:1px solid var(--line-strong);
  box-shadow:var(--shadow-panel);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.page-about .who-card::after{
  content:"";
  position:absolute;
  top:0;
  right:0;
  width:24px;
  height:24px;
  background:linear-gradient(225deg,rgba(217,154,61,.55) 0 48%,rgba(244,239,230,0) 50%);
}
.page-about .who-card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-lift);
}
.page-about .who-card__title{
  margin:0 0 10px;
  font-family:var(--font-display);
  font-size:20px;
  line-height:1.4;
  color:var(--navy);
}
.page-about .who-card__text{
  margin:0;
  font-size:14.5px;
  line-height:1.85;
  color:rgba(15,20,23,.82);
}
.page-about .who-card__foot{
  margin:14px 0 0;
  padding-top:12px;
  border-top:1px dashed var(--line-strong);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--teal);
}

/* ---------- 02 整理方法 ---------- */
.page-about .method-grid{
  display:grid;
  gap:clamp(24px,4vw,40px);
  align-items:start;
}
.page-about .cat-list{
  list-style:none;
  margin:0;
  padding:0;
  border-top:1px solid var(--line-strong);
}
.page-about .cat-list__item{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:16px;
  padding:18px 0;
  border-bottom:1px solid var(--line);
}
.page-about .cat-list__no{
  width:30px;
  height:30px;
  display:grid;
  place-items:center;
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--paper);
  background:var(--navy);
}
.page-about .cat-list__name{
  margin:0 0 6px;
  font-family:var(--font-display);
  font-size:19px;
  line-height:1.4;
  color:var(--ink);
}
.page-about .cat-list__desc{
  margin:0;
  font-size:14.5px;
  line-height:1.85;
  color:rgba(15,20,23,.78);
}
.page-about .method-figure .figure__frame{
  border-color:var(--line-strong);
}

/* ---------- 03 版本演进 ---------- */
.page-about .versions-figure{
  margin-bottom:clamp(26px,4vw,42px);
}
.page-about .timeline{
  list-style:none;
  margin:0;
  padding:0 0 0 26px;
  position:relative;
}
.page-about .timeline::before{
  content:"";
  position:absolute;
  left:5px;
  top:10px;
  bottom:14px;
  width:2px;
  background:linear-gradient(180deg,var(--amber),var(--teal) 60%,var(--gray-blue));
}
.page-about .timeline__item{
  position:relative;
  padding-bottom:18px;
}
.page-about .timeline__item::before{
  content:"";
  position:absolute;
  left:-26px;
  top:20px;
  width:12px;
  height:12px;
  border-radius:50%;
  background:var(--paper);
  border:3px solid var(--teal);
}
.page-about .timeline__item--current::before{
  border-color:var(--red);
  background:var(--amber-soft);
}
.page-about .timeline__card{
  padding:18px 18px 16px;
  background:var(--paper);
  border:1px solid var(--line);
  border-left:3px solid var(--line-strong);
  transition:transform .28s var(--ease),border-color .28s var(--ease),box-shadow .28s var(--ease);
}
.page-about .timeline__item:hover .timeline__card,
.page-about .timeline__item:focus-within .timeline__card{
  transform:translateX(5px);
  border-left-color:var(--amber);
  box-shadow:var(--shadow-panel);
}
.page-about .timeline__item--current .timeline__card{
  border-left-color:var(--red);
  background:linear-gradient(180deg,rgba(240,201,135,.28),var(--paper) 70%);
}
.page-about .timeline__ver{
  margin:0 0 6px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--red);
}
.page-about .timeline__title{
  margin:0 0 8px;
  font-family:var(--font-display);
  font-size:19px;
  line-height:1.4;
  color:var(--navy);
}
.page-about .timeline__text{
  margin:0;
  font-size:14.5px;
  line-height:1.85;
  color:rgba(15,20,23,.8);
}

/* ---------- 04 服务与支持 ---------- */
.page-about .support-grid{
  display:grid;
  gap:clamp(24px,4vw,40px);
  align-items:start;
}
.page-about .assist-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:14px;
}
.page-about .assist-list__item{
  padding:16px 18px;
  background:var(--paper-deep);
  border-bottom:2px solid var(--line-strong);
}
.page-about .assist-list__name{
  margin:0 0 7px;
  font-family:var(--font-display);
  font-size:18px;
  line-height:1.4;
  color:var(--ink);
}
.page-about .assist-list__text{
  margin:0;
  font-size:14.5px;
  line-height:1.85;
  color:rgba(15,20,23,.8);
}
.page-about .contact-panel{
  padding:clamp(22px,3vw,30px);
  background:var(--navy);
  color:var(--paper);
  border:1px solid var(--navy-deep);
  box-shadow:var(--shadow-panel);
}
.page-about .contact-panel__title{
  margin:0 0 18px;
  padding-bottom:12px;
  border-bottom:1px solid var(--line-paper);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.14em;
  color:var(--amber);
}
.page-about .contact-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:14px;
}
.page-about .contact-list__label{
  display:block;
  margin-bottom:6px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--gray-blue);
}
.page-about .contact-list__value{
  font-size:14.5px;
  line-height:1.75;
  color:var(--paper);
}
.page-about .copy-field{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:4px 12px;
  width:100%;
  padding:10px 12px;
  text-align:left;
  background:rgba(244,239,230,.06);
  border:1px dashed rgba(244,239,230,.3);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:13.5px;
  cursor:pointer;
  transition:background .25s var(--ease),border-color .25s var(--ease);
}
.page-about .copy-field:hover,
.page-about .copy-field:focus-visible{
  background:rgba(244,239,230,.14);
  border-color:var(--amber-soft);
}
.page-about .copy-field__hint{
  font-size:12px;
  color:var(--amber-soft);
}
.page-about .contact-panel__note{
  margin:20px 0 0;
  padding-top:14px;
  border-top:1px solid var(--line-paper);
  font-size:13.5px;
  line-height:1.8;
  color:rgba(244,239,230,.72);
}

/* ---------- 05 长期维护 ---------- */
.page-about .stats{
  display:grid;
  gap:0 34px;
  margin-bottom:28px;
  border-top:1px solid var(--line-strong);
}
.page-about .stat{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:6px 16px;
  align-items:baseline;
  padding:16px 0;
  border-bottom:1px solid var(--line);
}
.page-about .stat__num{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(26px,4vw,38px);
  line-height:1;
  color:var(--navy);
  letter-spacing:-.02em;
}
.page-about .stat__label{
  font-size:14px;
  line-height:1.75;
  color:rgba(15,20,23,.76);
}
.page-about .maintain-text{
  margin-bottom:0;
}

/* ---------- 收尾入口 ---------- */
.page-about .about-cta{
  background:var(--navy-deep);
  color:var(--paper);
  padding:clamp(46px,6vw,76px) 0;
  border-top:5px solid var(--amber);
}
.page-about .about-cta__inner{
  display:grid;
  gap:clamp(22px,3vw,40px);
  align-items:center;
}
.page-about .about-cta__title{
  margin:0 0 12px;
  font-family:var(--font-display);
  font-size:clamp(24px,3.4vw,36px);
  line-height:1.3;
  color:var(--paper);
}
.page-about .about-cta__desc{
  margin:0;
  max-width:48ch;
  font-size:15px;
  line-height:1.9;
  color:rgba(244,239,230,.78);
}
.page-about .about-cta__links{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
}
.page-about .about-cta__links .btn{
  font-family:var(--font-mono);
  font-size:13.5px;
  letter-spacing:.04em;
  padding:13px 20px;
  border:1px solid transparent;
  text-decoration:none;
  display:inline-block;
  transition:transform .25s var(--ease),background .25s var(--ease),border-color .25s var(--ease);
}
.page-about .about-cta__links .btn--accent{
  background:var(--amber);
  color:var(--navy-deep);
}
.page-about .about-cta__links .btn--line{
  border-color:var(--amber-soft);
  color:var(--amber-soft);
}
.page-about .about-cta__links .btn--ghost{
  border-color:rgba(244,239,230,.3);
  color:var(--paper);
}
.page-about .about-cta__links .btn:hover{
  transform:translateY(-2px);
}

/* ---------- 响应式 ---------- */
@media (min-width:600px){
  .page-about .who-grid{
    grid-template-columns:repeat(2,minmax(0,1fr));
  }
  .page-about .stats{
    grid-template-columns:repeat(2,minmax(0,1fr));
  }
}

@media (min-width:900px){
  .page-about .about-hero__grid{
    grid-template-columns:minmax(0,1.42fr) minmax(0,.88fr);
    gap:clamp(40px,5vw,72px);
  }
  .page-about .chapter__inner{
    grid-template-columns:var(--about-rail) minmax(0,1fr);
    gap:clamp(36px,5vw,76px);
  }
  .page-about .chapter__rail{
    position:sticky;
    top:calc(var(--header-h) + 28px);
    align-self:start;
  }
  .page-about .who-grid{
    grid-template-columns:repeat(3,minmax(0,1fr));
  }
  .page-about .method-grid{
    grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);
  }
  .page-about .support-grid{
    grid-template-columns:minmax(0,1fr) minmax(0,.92fr);
  }
  .page-about .about-cta__inner{
    grid-template-columns:minmax(0,1.2fr) auto;
  }
  .page-about .about-cta__links{
    justify-content:flex-end;
  }
}

@media (min-width:1100px){
  .page-about{
    --about-rail:220px;
  }
}
<<<END>>>