.page-about{
  --ab-cream:#F4E9D2;
  --ab-cream-deep:#E8D8B6;
  --ab-rule:rgba(26,20,16,.14);
  --ab-brown-soft:rgba(26,20,16,.72);
  --ab-mist-soft:rgba(233,241,236,.76);
  --ab-gold-line:rgba(242,201,76,.24);
  background:var(--ink);
  color:var(--mist);
}

.page-about .ab-section{
  padding:clamp(42px,8vw,88px) 0;
}

/* ---------- 首屏框景 ---------- */
.page-about .ab-hero{
  position:relative;
  padding:clamp(26px,5vw,56px) 0 clamp(38px,7vw,78px);
  background:
    radial-gradient(120% 90% at 10% -10%, #12463A 0%, rgba(18,70,58,0) 62%),
    radial-gradient(90% 70% at 100% 0%, rgba(55,217,196,.14) 0%, rgba(55,217,196,0) 60%),
    linear-gradient(180deg,#0B2B24 0%, #071C18 100%);
  overflow:hidden;
}

.page-about .ab-hero::before{
  content:"";
  position:absolute;
  inset:clamp(10px,1.8vw,20px);
  border:1px solid var(--ab-gold-line);
  border-radius:var(--radius-lg);
  pointer-events:none;
}

.page-about .ab-hero::after{
  content:"";
  position:absolute;
  left:0; right:0; bottom:0;
  height:1px;
  background:linear-gradient(90deg, rgba(242,201,76,0), rgba(242,201,76,.5), rgba(242,201,76,0));
}

.page-about .ab-crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:.78rem;
  letter-spacing:.06em;
  text-transform:uppercase;
  color:rgba(233,241,236,.58);
  margin-bottom:clamp(20px,3.5vw,34px);
}
.page-about .ab-crumbs a{
  color:rgba(233,241,236,.82);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .ab-crumbs a:hover{
  color:var(--gold);
  border-bottom-color:var(--gold);
}
.page-about .ab-crumbs .ab-sep{
  color:var(--gold);
  opacity:.7;
}

.page-about .ab-hero-grid{
  display:grid;
  gap:clamp(24px,4vw,44px);
  grid-template-columns:1fr;
}
@media (min-width:920px){
  .page-about .ab-hero-grid{
    grid-template-columns:1.6fr .85fr;
    align-items:end;
  }
}

.page-about .ab-hero h1{
  margin:.35em 0 .55em;
  font-size:clamp(2rem,6.4vw,3.7rem);
  line-height:1.03;
  letter-spacing:-.035em;
  font-weight:900;
  color:var(--mist);
}

.page-about .ab-lede{
  max-width:60ch;
  font-size:clamp(.96rem,1.6vw,1.06rem);
  line-height:1.78;
  color:var(--ab-mist-soft);
}

.page-about .ab-hero-actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:clamp(20px,3vw,30px);
}

.page-about .ab-hero-side{
  padding:clamp(18px,3vw,26px);
  border-radius:var(--radius-md);
  background:var(--glass);
  border:1px solid var(--line);
  box-shadow:var(--shadow-soft);
  backdrop-filter:blur(12px);
}

.page-about .ab-side-title{
  margin:0 0 16px;
  font-size:.76rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  font-weight:700;
  color:var(--gold);
}

.page-about .ab-side-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:14px;
}
.page-about .ab-side-list li{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:12px;
  align-items:baseline;
  padding-top:14px;
  border-top:1px solid var(--line-soft);
  font-size:.88rem;
  line-height:1.6;
  color:rgba(233,241,236,.82);
}
.page-about .ab-side-list li:first-child{
  padding-top:0;
  border-top:0;
}
.page-about .ab-side-num{
  font-size:1.55rem;
  line-height:1;
  font-weight:700;
  color:var(--neon);
}

/* ---------- 通用标题组 ---------- */
.page-about .ab-sec-head{
  max-width:64ch;
  margin-bottom:clamp(26px,4vw,44px);
}
.page-about .ab-sec-head h2{
  margin:.3em 0 .5em;
  font-size:clamp(1.55rem,3.6vw,2.4rem);
  line-height:1.12;
  letter-spacing:-.025em;
  font-weight:900;
  color:var(--mist);
}
.page-about .ab-sec-head p{
  font-size:.98rem;
  line-height:1.78;
  color:var(--ab-mist-soft);
}

.page-about .ab-eyebrow--brown{
  color:#8A5F12;
}

.page-about .ab-p{
  margin:0 0 1em;
  line-height:1.82;
}

/* ---------- 品牌使命 ---------- */
.page-about .ab-mission{
  background:var(--ab-cream);
  color:var(--brown);
  position:relative;
}
.page-about .ab-mission::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:repeating-linear-gradient(180deg, rgba(26,20,16,.045) 0 1px, transparent 1px 34px);
  pointer-events:none;
}
.page-about .ab-mission-grid{
  position:relative;
  display:grid;
  gap:clamp(26px,4vw,50px);
  grid-template-columns:1fr;
}
@media (min-width:920px){
  .page-about .ab-mission-grid{
    grid-template-columns:1.08fr .92fr;
    align-items:center;
  }
}

.page-about .ab-mission h2{
  margin:.3em 0 .55em;
  font-size:clamp(1.65rem,4vw,2.6rem);
  line-height:1.1;
  letter-spacing:-.028em;
  font-weight:900;
  color:var(--brown);
}

.page-about .ab-mission-copy p{
  max-width:58ch;
  color:var(--ab-brown-soft);
}

.page-about .ab-textlink{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-top:8px;
  font-size:.9rem;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--brown);
  text-decoration:none;
  border-bottom:2px solid var(--gold);
  padding-bottom:3px;
  transition:color .2s var(--ease), gap .2s var(--ease);
}
.page-about .ab-textlink:hover{
  color:#8A5F12;
  gap:14px;
}

.page-about .ab-fig{
  margin:0;
}
.page-about .ab-fig img{
  display:block;
  width:100%;
  height:auto;
  border-radius:var(--radius-md);
  object-fit:cover;
}
.page-about .ab-fig figcaption{
  margin-top:10px;
  font-size:.8rem;
  line-height:1.6;
  letter-spacing:.02em;
  color:rgba(26,20,16,.58);
}

.page-about .ab-fig--mission{
  position:relative;
}
.page-about .ab-fig--mission img{
  border:1px solid rgba(26,20,16,.14);
  box-shadow:var(--shadow-soft);
}
@media (min-width:920px){
  .page-about .ab-fig--mission{
    transform:translateY(-16px);
  }
}

/* ---------- 数据标准 ---------- */
.page-about .ab-standards{
  background:
    radial-gradient(80% 60% at 0% 0%, rgba(55,217,196,.1), transparent 60%),
    linear-gradient(180deg,#0B2B24 0%, #0E372D 46%, #0B2B24 100%);
}

.page-about .ab-std-grid{
  display:grid;
  gap:clamp(14px,2.4vw,20px);
  grid-template-columns:1fr;
}
@media (min-width:880px){
  .page-about .ab-std-grid{
    grid-template-columns:repeat(3,1fr);
    align-items:start;
  }
}

.page-about .ab-std{
  position:relative;
  padding:clamp(20px,3vw,30px);
  padding-top:clamp(26px,3.6vw,36px);
  border-radius:var(--radius-md);
  background:linear-gradient(160deg, rgba(24,76,63,.72), rgba(7,28,24,.92));
  border:1px solid var(--line);
  transition:transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.page-about .ab-std::before{
  content:"";
  position:absolute;
  top:0; left:0; right:0;
  height:3px;
  border-radius:3px 3px 0 0;
  background:var(--neon);
}
.page-about .ab-std:nth-child(2)::before{ background:var(--gold); }
.page-about .ab-std:nth-child(3)::before{ background:var(--alert); }

.page-about .ab-std:hover,
.page-about .ab-std:focus-within{
  transform:translateY(-4px);
  border-color:var(--line-gold);
  box-shadow:var(--shadow-soft);
}

.page-about .ab-std-no{
  display:inline-block;
  font-size:.74rem;
  letter-spacing:.18em;
  color:var(--gold);
  margin-bottom:12px;
}

.page-about .ab-std h3{
  margin:0 0 .55em;
  font-size:clamp(1.08rem,2vw,1.28rem);
  line-height:1.3;
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--mist);
}

.page-about .ab-std > p{
  margin:0 0 14px;
  font-size:.9rem;
  line-height:1.76;
  color:rgba(233,241,236,.74);
}

.page-about .ab-std-more,
.page-about .ab-q-more,
.page-about .ab-q details{
  border-top:1px dashed var(--line);
  padding-top:12px;
}
.page-about .ab-std-more summary,
.page-about .ab-q-more summary{
  cursor:pointer;
  list-style:none;
  font-size:.78rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  font-weight:700;
  color:var(--neon);
  display:flex;
  align-items:center;
  gap:8px;
}
.page-about .ab-std-more summary::-webkit-details-marker,
.page-about .ab-q-more summary::-webkit-details-marker{
  display:none;
}
.page-about .ab-std-more summary::after{
  content:"+";
  font-size:.95rem;
  line-height:1;
  transition:transform .25s var(--ease);
}
.page-about .ab-std-more[open] summary::after{
  transform:rotate(45deg);
}
.page-about .ab-std-more p{
  margin:10px 0 0;
  font-size:.86rem;
  line-height:1.75;
  color:rgba(233,241,236,.7);
}

.page-about .ab-fig--standards{
  margin-top:clamp(26px,4vw,44px);
  max-width:760px;
}
.page-about .ab-fig--standards img{
  border:1px solid var(--line-gold);
}
.page-about .ab-fig--standards figcaption{
  color:rgba(233,241,236,.58);
}

/* ---------- 四象限 ---------- */
.page-about .ab-quad{
  background:var(--ab-cream);
  color:var(--brown);
}
.page-about .ab-sec-head--brown h2{ color:var(--brown); }
.page-about .ab-sec-head--brown p{ color:var(--ab-brown-soft); }

.page-about .ab-quad-wrap{
  position:relative;
  display:grid;
  grid-template-columns:1fr;
  gap:2px;
  background:rgba(26,20,16,.22);
  border:2px solid rgba(26,20,16,.22);
  border-radius:var(--radius-md);
  overflow:hidden;
}
@media (min-width:820px){
  .page-about .ab-quad-wrap{
    grid-template-columns:1fr 1fr;
  }
}

.page-about .ab-quad-badge{
  display:none;
}
@media (min-width:820px){
  .page-about .ab-quad-badge{
    display:block;
    position:absolute;
    top:50%; left:50%;
    width:64px; height:64px;
    transform:translate(-50%,-50%);
    z-index:2;
    filter:drop-shadow(0 6px 14px rgba(0,0,0,.3));
  }
}

.page-about .ab-q{
  position:relative;
  background:var(--ab-cream);
  padding:clamp(22px,3.4vw,36px);
  transition:background .25s var(--ease), box-shadow .25s var(--ease);
}
.page-about .ab-q:hover,
.page-about .ab-q:focus-within{
  background:#FBF3E2;
  box-shadow:inset 0 0 0 2px rgba(242,201,76,.5);
}

.page-about .ab-q-tag{
  margin:0 0 10px;
  font-size:.72rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:#8A5F12;
}

.page-about .ab-q h3{
  margin:0 0 .5em;
  font-size:clamp(1.15rem,2.4vw,1.42rem);
  line-height:1.24;
  font-weight:900;
  letter-spacing:-.015em;
  color:var(--brown);
}

.page-about .ab-q > p{
  margin:0 0 14px;
  font-size:.9rem;
  line-height:1.78;
  color:var(--ab-brown-soft);
}

.page-about .ab-q-more{
  border-top:1px dashed rgba(26,20,16,.2);
}
.page-about .ab-q-more summary{
  color:#1D5A4B;
}
.page-about .ab-q-more summary::after{
  content:"＋";
  font-size:.85rem;
  line-height:1;
  transition:transform .25s var(--ease);
}
.page-about .ab-q-more[open] summary::after{
  transform:rotate(45deg);
}
.page-about .ab-q-more p{
  margin:10px 0 0;
  font-size:.86rem;
  line-height:1.78;
  color:rgba(26,20,16,.66);
}

/* ---------- V4 演进 ---------- */
.page-about .ab-v4{
  background:
    radial-gradient(70% 60% at 100% 0%, rgba(242,201,76,.12), transparent 62%),
    linear-gradient(180deg,#071C18 0%, #0B2B24 100%);
}

.page-about .ab-track{
  list-style:none;
  margin:0 0 clamp(22px,4vw,34px);
  padding:0;
  display:grid;
  gap:10px;
  grid-template-columns:1fr;
  position:relative;
}
@media (min-width:780px){
  .page-about .ab-track{
    grid-template-columns:repeat(3,1fr);
    gap:0;
    padding-top:6px;
  }
  .page-about .ab-track::before{
    content:"";
    position:absolute;
    left:0; right:0; top:12px;
    height:1px;
    background:linear-gradient(90deg, rgba(242,201,76,.12), rgba(242,201,76,.62), rgba(242,201,76,.12));
  }
}

.page-about .ab-track a{
  position:relative;
  display:flex;
  align-items:center;
  gap:10px;
  padding:8px 0;
  text-decoration:none;
  color:rgba(233,241,236,.7);
  font-size:.86rem;
  transition:color .2s var(--ease);
}
.page-about .ab-track a:hover,
.page-about .ab-track a:focus-visible{
  color:var(--gold);
}
@media (min-width:780px){
  .page-about .ab-track a{
    flex-direction:column;
    align-items:flex-start;
    gap:8px;
    padding:0 18px 0 0;
  }
}

.page-about .ab-track-dot{
  flex:none;
  width:13px; height:13px;
  border-radius:50%;
  background:var(--ink-night);
  border:2px solid var(--gold);
  box-shadow:0 0 0 5px rgba(7,28,24,.95);
  transition:background .2s var(--ease), box-shadow .2s var(--ease);
}
.page-about .ab-track a:hover .ab-track-dot{
  background:var(--gold);
  box-shadow:0 0 0 5px rgba(7,28,24,.95), 0 0 14px rgba(242,201,76,.7);
}

.page-about .ab-track-no{
  font-size:.72rem;
  letter-spacing:.16em;
  color:var(--neon);
}
.page-about .ab-track-label{
  font-weight:700;
  letter-spacing:.01em;
}

.page-about .ab-v4-list{
  display:grid;
  gap:clamp(14px,2.4vw,20px);
  grid-template-columns:1fr;
}
@media (min-width:860px){
  .page-about .ab-v4-list{
    grid-template-columns:repeat(3,1fr);
    align-items:start;
  }
}

.page-about .ab-v4-item{
  padding:clamp(18px,2.8vw,26px);
  border-radius:var(--radius-md);
  background:var(--glass);
  border:1px solid var(--line);
  backdrop-filter:blur(10px);
  transition:border-color .25s var(--ease), box-shadow .25s var(--ease);
}
.page-about .ab-v4-item:last-child{
  border-color:var(--line-gold);
  background:linear-gradient(160deg, rgba(242,201,76,.16), rgba(24,76,63,.62));
}
.page-about .ab-v4-item:target{
  border-color:var(--neon);
  box-shadow:0 0 0 1px var(--neon), var(--shadow-soft);
}

.page-about .ab-v4-item h3{
  margin:0 0 .55em;
  font-size:clamp(1rem,1.9vw,1.14rem);
  line-height:1.34;
  font-weight:800;
  color:var(--mist);
}
.page-about .ab-v4-item p{
  margin:0;
  font-size:.88rem;
  line-height:1.78;
  color:rgba(233,241,236,.74);
}

.page-about .ab-fig--v4{
  margin-top:clamp(26px,4vw,46px);
}
.page-about .ab-fig--v4 img{
  border:1px solid var(--line-gold);
  box-shadow:var(--shadow-soft);
}
.page-about .ab-fig--v4 figcaption{
  color:rgba(233,241,236,.58);
}

/* ---------- 团队 ---------- */
.page-about .ab-team{
  background:var(--ab-cream);
  color:var(--brown);
}
.page-about .ab-team-grid{
  display:grid;
  gap:clamp(26px,4vw,46px);
  grid-template-columns:1fr;
}
@media (min-width:920px){
  .page-about .ab-team-grid{
    grid-template-columns:1.28fr .72fr;
    align-items:start;
  }
}

.page-about .ab-team h2{
  margin:.3em 0 .55em;
  font-size:clamp(1.55rem,3.6vw,2.35rem);
  line-height:1.12;
  letter-spacing:-.025em;
  font-weight:900;
  color:var(--brown);
}
.page-about .ab-team-copy p{
  max-width:60ch;
  color:var(--ab-brown-soft);
  line-height:1.82;
}

.page-about .ab-team-list{
  list-style:none;
  margin:clamp(18px,3vw,26px) 0 0;
  padding:0;
  display:grid;
  gap:14px;
}
.page-about .ab-team-list li{
  display:grid;
  gap:4px;
  padding-left:16px;
  border-left:3px solid var(--gold);
}
.page-about .ab-team-list strong{
  font-size:.95rem;
  font-weight:800;
  letter-spacing:.01em;
  color:var(--brown);
}
.page-about .ab-team-list span{
  font-size:.88rem;
  line-height:1.76;
  color:var(--ab-brown-soft);
}

.page-about .ab-rhythm{
  padding:clamp(20px,3vw,28px);
  border-radius:var(--radius-md);
  background:linear-gradient(160deg, #12463A, #071C18);
  color:var(--mist);
  box-shadow:var(--shadow-soft);
}
.page-about .ab-rhythm h3{
  margin:0 0 18px;
  font-size:.8rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  font-weight:700;
  color:var(--gold);
}
.page-about .ab-rhythm-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:16px;
}
.page-about .ab-rhythm-list li{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:12px;
  align-items:start;
  padding-top:16px;
  border-top:1px solid var(--line-soft);
}
.page-about .ab-rhythm-list li:first-child{
  padding-top:0;
  border-top:0;
}
.page-about .ab-rhythm-k{
  font-size:.74rem;
  letter-spacing:.1em;
  color:var(--ink-night);
  background:var(--neon);
  border-radius:999px;
  padding:3px 10px;
  white-space:nowrap;
}
.page-about .ab-rhythm-list p{
  margin:0;
  font-size:.86rem;
  line-height:1.72;
  color:rgba(233,241,236,.78);
}

/* ---------- 联系 ---------- */
.page-about .ab-contact{
  background:linear-gradient(180deg,#0B2B24 0%, #071C18 100%);
}
.page-about .ab-contact-card{
  display:grid;
  gap:clamp(20px,3vw,32px);
  grid-template-columns:1fr;
  padding:clamp(24px,4.5vw,48px);
  border-radius:var(--radius-lg);
  border:1px solid var(--line-gold);
  background:linear-gradient(150deg, rgba(24,76,63,.72), rgba(7,28,24,.9));
  box-shadow:var(--shadow-soft);
}
@media (min-width:860px){
  .page-about .ab-contact-card{
    grid-template-columns:1.5fr auto;
    align-items:center;
  }
}

.page-about .ab-contact-copy h2{
  margin:.3em 0 .55em;
  font-size:clamp(1.5rem,3.4vw,2.15rem);
  line-height:1.14;
  letter-spacing:-.025em;
  font-weight:900;
  color:var(--mist);
}
.page-about .ab-contact-copy p{
  margin:0;
  max-width:58ch;
  font-size:.94rem;
  line-height:1.82;
  color:var(--ab-mist-soft);
}

.page-about .ab-contact-actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
}

@media (prefers-reduced-motion:reduce){
  .page-about .ab-std,
  .page-about .ab-q,
  .page-about .ab-v4-item,
  .page-about .ab-track-dot,
  .page-about .ab-textlink{
    transition:none;
  }
  .page-about .ab-std:hover,
  .page-about .ab-std:focus-within,
  .page-about .ab-fig--mission{
    transform:none;
  }
}
<<<END>>>