.page-about{
  --about-rail:264px;
  display:block;
  font-family:var(--font-body);
  color:var(--ink);
}

.page-about .mono{
  font-family:var(--font-mono);
  letter-spacing:.06em;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb{
  padding-top:22px;
  padding-bottom:4px;
}
.page-about .breadcrumb__list{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:0;
  margin:0;
  padding:0;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--stone);
}
.page-about .breadcrumb__item{
  display:flex;
  align-items:center;
  color:var(--stone);
}
.page-about .breadcrumb__item + .breadcrumb__item::before{
  content:"/";
  margin:0 8px;
  color:var(--line-strong);
}
.page-about .breadcrumb__link{
  color:var(--stone);
  text-decoration:none;
  transition:color .18s ease;
}
.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible{
  color:var(--red);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position:relative;
  overflow:hidden;
  margin-top:16px;
  padding:42px 0 38px;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg, rgba(243,219,213,.55) 0%, rgba(250,246,238,0) 64%);
}
.page-about .about-hero::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:5px;
  background:linear-gradient(90deg, var(--red) 0 33%, var(--gold) 33% 66%, var(--jade) 66% 100%);
  opacity:.85;
}
.page-about .about-hero::after{
  content:"";
  position:absolute;
  top:-150px;
  right:-130px;
  width:420px;
  height:420px;
  border-radius:50%;
  background:radial-gradient(circle, rgba(31,111,99,.16), rgba(31,111,99,0) 68%);
  pointer-events:none;
}
.page-about .about-hero__inner{
  position:relative;
  z-index:1;
}
.page-about .about-hero__kicker{
  margin:0 0 16px;
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--red);
}
.page-about .about-hero__title{
  margin:0;
  max-width:18em;
  font-family:var(--font-display);
  font-size:30px;
  line-height:1.3;
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--ink);
}
.page-about .about-hero__lead{
  max-width:44em;
  margin:18px 0 0;
  font-size:16px;
  line-height:1.9;
  color:var(--stone);
}
.page-about .about-hero__marks{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:12px 30px;
  margin:26px 0 0;
  padding:20px 0 0;
  border-top:1px solid var(--line);
  font-size:14px;
  color:var(--stone);
}
.page-about .about-hero__marks li{
  display:flex;
  align-items:baseline;
  gap:8px;
}
.page-about .about-hero__marks .mono{
  font-size:24px;
  font-weight:700;
  line-height:1;
  color:var(--red);
  letter-spacing:0;
}

/* ---------- 账册骨架 ---------- */
.page-about .about-ledger{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:26px;
  padding:30px 0 0;
}
.page-about .about-rail__label{
  margin:0 0 10px;
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--stone);
}
.page-about .about-index{
  list-style:none;
  display:flex;
  gap:10px;
  margin:0;
  padding:0 0 6px;
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
}
.page-about .about-index > li{
  flex:0 0 auto;
}
.page-about .about-index a{
  display:flex;
  flex-direction:column;
  gap:3px;
  min-width:142px;
  padding:10px 14px;
  border:1px solid var(--line);
  border-radius:10px;
  background:var(--paper-deep);
  color:var(--ink);
  text-decoration:none;
  transition:border-color .18s ease, background .18s ease;
}
.page-about .about-index__num{
  font-size:11px;
  letter-spacing:.14em;
  color:var(--red);
}
.page-about .about-index__name{
  font-size:14px;
  line-height:1.5;
}
.page-about .about-index a:hover,
.page-about .about-index a[aria-current]{
  border-color:var(--red);
  background:var(--red-soft);
}
.page-about .about-index a:focus-visible{
  outline:2px solid var(--red);
  outline-offset:2px;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec{
  margin-bottom:62px;
  scroll-margin-top:24px;
}
.page-about .about-sec:last-child{
  margin-bottom:36px;
}
.page-about .section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:6px 16px;
  padding-bottom:14px;
  margin-bottom:24px;
  border-bottom:1px solid var(--line);
}
.page-about .section-head__num{
  margin:0;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.14em;
  color:var(--red);
}
.page-about .section-head--jade .section-head__num{ color:var(--jade); }
.page-about .section-head--gold .section-head__num{ color:var(--gold-ink); }
.page-about .section-head__title{
  flex:1 1 auto;
  margin:0;
  font-family:var(--font-display);
  font-size:22px;
  line-height:1.35;
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--ink);
}
.page-about .section-head__aside{
  margin:0;
  font-size:13px;
  color:var(--stone);
}
.page-about .about-intro{
  max-width:40em;
  margin:0 0 26px;
  font-size:16px;
  line-height:1.9;
  color:var(--stone);
}

/* ---------- A-01 时间线 ---------- */
.page-about .about-timeline{
  list-style:none;
  display:flex;
  gap:16px;
  margin:0;
  padding:0 0 14px;
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
  scroll-snap-type:x mandatory;
}
.page-about .about-timeline__item{
  position:relative;
  flex:0 0 252px;
  padding-top:22px;
  border-top:2px solid var(--edge);
  scroll-snap-align:start;
  transition:border-color .18s ease, transform .18s ease;
}
.page-about .about-timeline__item::before{
  content:"";
  position:absolute;
  top:-7px;
  left:0;
  width:12px;
  height:12px;
  border-radius:50%;
  background:var(--red);
  box-shadow:0 0 0 4px var(--paper);
}
.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-within{
  border-top-color:var(--red);
  transform:translateY(-2px);
}
.page-about .about-timeline__stage{
  margin:0 0 8px;
  font-size:12px;
  letter-spacing:.16em;
  color:var(--red);
}
.page-about .about-timeline__title{
  margin:0 0 8px;
  font-family:var(--font-display);
  font-size:17px;
  line-height:1.45;
  font-weight:700;
  color:var(--ink);
}
.page-about .about-timeline__text{
  margin:0;
  font-size:14px;
  line-height:1.85;
  color:var(--stone);
}

/* ---------- A-02 家底清单 ---------- */
.page-about .about-roster{
  list-style:none;
  display:grid;
  gap:12px;
  margin:0;
  padding:0;
}
.page-about .about-roster__item{
  display:grid;
  grid-template-columns:82px minmax(0,1fr);
  gap:16px;
  align-items:start;
  padding:16px;
  border:1px solid var(--line);
  border-radius:10px;
  background:var(--paper-deep);
  transition:border-color .18s ease, transform .18s ease;
}
.page-about .about-roster__item:hover,
.page-about .about-roster__item:focus-within{
  border-color:var(--line-strong);
  transform:translateY(-2px);
}
.page-about .about-roster__num{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:2px;
  padding:10px 4px;
  border:1px solid var(--edge);
  border-radius:8px;
  background:linear-gradient(160deg, rgba(255,255,255,.72), rgba(231,223,210,.45));
}
.page-about .about-roster__digit{
  font-family:var(--font-display);
  font-size:30px;
  line-height:1;
  font-weight:800;
  letter-spacing:-.02em;
  color:var(--jade);
}
.page-about .about-roster__item:nth-child(2) .about-roster__digit{ color:var(--gold-ink); }
.page-about .about-roster__item:nth-child(3) .about-roster__digit{ color:var(--red); }
.page-about .about-roster__unit{
  font-size:11px;
  color:var(--stone);
}
.page-about .about-roster__title{
  margin:0 0 6px;
  font-family:var(--font-display);
  font-size:16px;
  font-weight:700;
  color:var(--ink);
}
.page-about .about-roster__body p{
  margin:0;
  font-size:14px;
  line-height:1.85;
  color:var(--stone);
}

/* ---------- 图片通用 ---------- */
.page-about .figure{
  margin:0;
}
.page-about .figure img{
  display:block;
  width:100%;
  max-width:100%;
  height:auto;
  object-fit:cover;
  border-radius:12px;
  border:1px solid var(--line);
}
.page-about .figure--16x9 img{ aspect-ratio:16 / 9; }
.page-about .figure--4x3 img{ aspect-ratio:4 / 3; }
.page-about .figure__caption{
  margin-top:10px;
  font-size:13px;
  line-height:1.7;
  color:var(--stone);
}
.page-about .about-sec__figure{
  margin-bottom:26px;
}

/* ---------- A-03 仓储区 ---------- */
.page-about .about-map{
  margin:0 0 24px;
  padding:16px;
  border:1px solid var(--line);
  border-radius:12px;
  background:var(--paper-deep);
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
}
.page-about .about-map__svg{
  display:block;
  width:100%;
  min-width:560px;
  height:auto;
}
.page-about .about-map__region{
  font-family:var(--font-mono);
  font-size:15px;
  letter-spacing:.12em;
}
.page-about .about-map__region--red{ fill:var(--red); }
.page-about .about-map__region--jade{ fill:var(--jade); }
.page-about .about-map__box--red{
  fill:var(--red-soft);
  stroke:var(--red);
  stroke-width:1.5;
}
.page-about .about-map__box--jade{
  fill:var(--jade-soft);
  stroke:var(--jade);
  stroke-width:1.5;
}
.page-about .about-map__city{
  font-family:var(--font-display);
  font-size:17px;
  font-weight:700;
  fill:var(--ink);
}
.page-about .about-map__code{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  fill:var(--stone);
}
.page-about .about-map__cap{
  margin-top:12px;
  font-size:13px;
  color:var(--stone);
}
.page-about .about-figures{
  list-style:none;
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:14px;
  margin:0 0 26px;
  padding:0;
}
.page-about .about-figures li{
  display:flex;
  flex-direction:column;
  gap:4px;
  padding:14px 16px;
  border-left:3px solid var(--gold);
  background:var(--gold-soft);
  border-radius:0 8px 8px 0;
}
.page-about .about-figures__n{
  font-size:26px;
  font-weight:700;
  line-height:1.1;
  color:var(--gold-ink);
  letter-spacing:0;
}
.page-about .about-figures__u{
  font-size:13px;
  line-height:1.6;
  color:var(--stone);
}
.page-about .grid{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:16px;
}
.page-about .card{
  position:relative;
  padding:20px 18px 18px;
  border:1px solid var(--line);
  border-radius:10px;
  background:var(--paper-deep);
  transition:border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.page-about .card::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:4px;
  border-radius:10px 10px 0 0;
  background:var(--edge);
}
.page-about .card--red::before{ background:var(--red); }
.page-about .card--jade::before{ background:var(--jade); }
.page-about .card:hover,
.page-about .card:focus-within{
  border-color:var(--line-strong);
  transform:translateY(-2px);
  box-shadow:var(--shadow-1);
}
.page-about .card__meta{
  margin:0 0 10px;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--stone);
}
.page-about .card--red .card__meta{ color:var(--red); }
.page-about .card--jade .card__meta{ color:var(--jade); }
.page-about .card__title{
  margin:0 0 8px;
  font-family:var(--font-display);
  font-size:18px;
  font-weight:700;
  color:var(--ink);
}
.page-about .card p{
  margin:0;
  font-size:14px;
  line-height:1.85;
  color:var(--stone);
}

/* ---------- A-04 检测 ---------- */
.page-about .about-check{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:26px;
}
.page-about .about-check__text p{
  margin:0 0 16px;
  font-size:16px;
  line-height:1.9;
  color:var(--stone);
}
.page-about .about-check__list{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin:22px 0 0;
  padding:0;
}
.page-about .about-check__list li{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 14px;
  border:1px solid var(--line);
  border-radius:999px;
  background:var(--paper-deep);
  font-size:14px;
  color:var(--ink);
}
.page-about .about-check__list .mono{
  font-size:11px;
  letter-spacing:.1em;
  color:var(--jade);
}
.page-about .about-check__figure{
  margin:0;
}

/* ---------- A-05 步骤 ---------- */
.page-about .about-steps{
  list-style:none;
  counter-reset:step;
  margin:0 0 30px;
  padding:0;
}
.page-about .about-steps__item{
  position:relative;
  margin-left:19px;
  padding:0 0 26px 40px;
  border-left:1px solid var(--line);
}
.page-about .about-steps__item:last-child{
  padding-bottom:0;
  border-left-color:transparent;
}
.page-about .about-steps__item::before{
  counter-increment:step;
  content:counter(step,decimal-leading-zero);
  position:absolute;
  top:-2px;
  left:-19px;
  display:grid;
  place-items:center;
  width:38px;
  height:38px;
  border:1.5px solid var(--red);
  border-radius:50%;
  background:var(--paper);
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--red);
}
.page-about .about-steps__title{
  margin:0 0 8px;
  font-family:var(--font-display);
  font-size:17px;
  line-height:1.45;
  font-weight:700;
  color:var(--ink);
  padding-top:4px;
}
.page-about .about-steps__item p{
  margin:0;
  max-width:38em;
  font-size:15px;
  line-height:1.9;
  color:var(--stone);
}
.page-about .about-steps__item p a{
  color:var(--red);
  text-decoration:underline;
  text-underline-offset:3px;
}
.page-about .about-steps__item p a:hover,
.page-about .about-steps__item p a:focus-visible{
  color:var(--ink);
}
.page-about .about-steps__figure{
  margin:0 0 30px;
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta{
  display:grid;
  gap:18px;
  padding:26px 24px;
  border:1px solid var(--line);
  border-radius:14px;
  background:linear-gradient(135deg, rgba(243,219,213,.72), rgba(213,232,227,.62));
}
.page-about .about-cta__text{
  margin:0;
  max-width:36em;
  font-size:16px;
  line-height:1.9;
  color:var(--ink);
}
.page-about .about-cta__actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
}
.page-about .btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:6px;
  padding:11px 20px;
  border:1px solid transparent;
  border-radius:8px;
  font-family:var(--font-display);
  font-size:15px;
  font-weight:600;
  text-decoration:none;
  transition:background .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}
.page-about .btn--red{
  background:var(--red);
  color:var(--paper);
}
.page-about .btn--red:hover,
.page-about .btn--red:focus-visible{
  background:#94281e;
  transform:translateY(-1px);
}
.page-about .btn--ghost{
  background:transparent;
  border-color:var(--line-strong);
  color:var(--ink);
}
.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible{
  border-color:var(--red);
  color:var(--red);
  transform:translateY(-1px);
}
.page-about .btn:focus-visible{
  outline:2px solid var(--red);
  outline-offset:2px;
}

/* ---------- 平板 ---------- */
@media (min-width:640px){
  .page-about .about-hero__title{ font-size:36px; }
  .page-about .about-figures{ grid-template-columns:repeat(4,minmax(0,1fr)); }
  .page-about .grid{ grid-template-columns:repeat(2,minmax(0,1fr)); }
  .page-about .about-check{ grid-template-columns:minmax(0,1fr) minmax(0,1fr); align-items:start; gap:32px; }
  .page-about .about-cta{ grid-template-columns:minmax(0,1fr) auto; align-items:center; padding:28px 30px; }
}

/* ---------- 桌面 ---------- */
@media (min-width:960px){
  .page-about .about-hero{ padding:64px 0 56px; }
  .page-about .about-hero__title{ font-size:44px; max-width:16em; }
  .page-about .about-hero__lead{ font-size:17px; }

  .page-about .about-ledger{
    grid-template-columns:var(--about-rail) minmax(0,1fr);
    gap:56px;
    padding-top:44px;
  }
  .page-about .about-rail{
    position:sticky;
    top:20px;
    align-self:start;
  }
  .page-about .about-index{
    flex-direction:column;
    gap:0;
    overflow:visible;
    padding:0;
  }
  .page-about .about-index a{
    min-width:0;
    flex-direction:row;
    align-items:baseline;
    gap:10px;
    padding:10px 12px;
    border:0;
    border-left:2px solid var(--line);
    border-radius:0;
    background:transparent;
  }
  .page-about .about-index a:hover,
  .page-about .about-index a[aria-current]{
    background:var(--red-soft);
    border-left-color:var(--red);
  }
  .page-about .about-index a:focus-visible{ outline-offset:0; }

  .page-about .about-sec{ margin-bottom:82px; }
  .page-about .section-head__title{ font-size:27px; }
  .page-about .about-intro{ font-size:17px; }

  .page-about .about-timeline{
    display:grid;
    grid-template-columns:repeat(4,minmax(0,1fr));
    gap:26px;
    overflow:visible;
    padding-bottom:0;
  }
  .page-about .about-timeline__item{ flex:none; }

  .page-about .about-roster{
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:16px;
  }
  .page-about .about-roster__item:first-child{
    grid-column:1 / -1;
  }

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

  .page-about .about-check{
    grid-template-columns:minmax(0,1fr) 380px;
    gap:48px;
  }
  .page-about .about-steps__figure{ max-width:640px; }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  .page-about .about-timeline__item,
  .page-about .about-roster__item,
  .page-about .card,
  .page-about .btn{
    transition:opacity .18s ease;
  }
  .page-about .about-timeline__item:hover,
  .page-about .about-roster__item:hover,
  .page-about .card:hover,
  .page-about .btn:hover{
    transform:none;
  }
}
<<<END>>>